diff options
| author | fvdl <fvdl@NetBSD.org> | 2000-06-22 16:09:33 +0000 |
|---|---|---|
| committer | fvdl <fvdl@NetBSD.org> | 2000-06-22 16:09:33 +0000 |
| commit | 35bcb23114eeec2fecdbb691d0c1cdb584d3517d (patch) | |
| tree | a01d5fc4a46b865d4ca02b98bae7d258bc14633e /gnu | |
| parent | 43c75b3d03cf3b392731f4392794bdd4f36b99c5 (diff) | |
This file was moved to sys/ufs/ffs.
Diffstat (limited to 'gnu')
| -rw-r--r-- | gnu/sys/ufs/ffs/ffs_softdep.c | 4720 |
1 files changed, 0 insertions, 4720 deletions
diff --git a/gnu/sys/ufs/ffs/ffs_softdep.c b/gnu/sys/ufs/ffs/ffs_softdep.c deleted file mode 100644 index 38c20030a8a..00000000000 --- a/gnu/sys/ufs/ffs/ffs_softdep.c +++ /dev/null @@ -1,4720 +0,0 @@ -/* $NetBSD: ffs_softdep.c,v 1.17 2000/06/22 15:21:04 fvdl Exp $ */ - -/* - * Copyright 1998 Marshall Kirk McKusick. All Rights Reserved. - * - * The soft updates code is derived from the appendix of a University - * of Michigan technical report (Gregory R. Ganger and Yale N. Patt, - * "Soft Updates: A Solution to the Metadata Update Problem in File - * Systems", CSE-TR-254-95, August 1995). - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions, and the following disclaimer, - * without modification, immediately at the beginning of the file. - * 2. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND ANY - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE FOR - * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * from: @(#)ffs_softdep.c 9.56 (McKusick) 1/17/00 - */ - -/* - * For now we want the safety net that the DIAGNOSTIC and DEBUG flags provide. - */ -#ifndef DIAGNOSTIC -#define DIAGNOSTIC -#endif -#ifndef DEBUG -#define DEBUG -#endif - -#include <sys/param.h> -#include <sys/buf.h> -#include <sys/callout.h> -#include <sys/kernel.h> -#include <sys/malloc.h> -#include <sys/mount.h> -#include <sys/proc.h> -#include <sys/syslog.h> -#include <sys/systm.h> -#include <sys/vnode.h> -#include <miscfs/specfs/specdev.h> -#include <ufs/ufs/dir.h> -#include <ufs/ufs/quota.h> -#include <ufs/ufs/inode.h> -#include <ufs/ufs/ufsmount.h> -#include <ufs/ffs/fs.h> -#include <ufs/ffs/softdep.h> -#include <ufs/ffs/ffs_extern.h> -#include <ufs/ufs/ufs_extern.h> -#include <ufs/ufs/ufs_bswap.h> - -/* - * These definitions need to be adapted to the system to which - * this file is being ported. - */ -/* - * Mapping of dependency structure types to malloc types. - */ -#define D_PAGEDEP M_PAGEDEP -#define D_INODEDEP M_INODEDEP -#define D_NEWBLK M_NEWBLK -#define D_BMSAFEMAP M_BMSAFEMAP -#define D_ALLOCDIRECT M_ALLOCDIRECT -#define D_INDIRDEP M_INDIRDEP -#define D_ALLOCINDIR M_ALLOCINDIR -#define D_FREEFRAG M_FREEFRAG -#define D_FREEBLKS M_FREEBLKS -#define D_FREEFILE M_FREEFILE -#define D_DIRADD M_DIRADD -#define D_MKDIR M_MKDIR -#define D_DIRREM M_DIRREM -/* - * Names of malloc types. - */ -extern char *memname[]; -#define TYPENAME(type) ((unsigned)(type) < M_LAST ? memname[type] : "???") -#define DtoM(type) (type) -/* - * Finding the current process. - */ -#define CURPROC curproc -#define CURPROC_PID (curproc ? curproc->p_pid : 0) -/* - * End system adaptaion definitions. - */ - -/* - * Internal function prototypes. - */ -static void softdep_error __P((char *, int)); -static void drain_output __P((struct vnode *, int)); -static int getdirtybuf __P((struct buf **, int)); -static void clear_remove __P((struct proc *)); -static void clear_inodedeps __P((struct proc *)); -static int flush_pagedep_deps __P((struct vnode *, struct mount *, - struct diraddhd *)); -static int flush_inodedep_deps __P((struct fs *, ino_t)); -static int handle_written_filepage __P((struct pagedep *, struct buf *)); -static void diradd_inode_written __P((struct diradd *, struct inodedep *)); -static int handle_written_inodeblock __P((struct inodedep *, struct buf *)); -static void handle_allocdirect_partdone __P((struct allocdirect *)); -static void handle_allocindir_partdone __P((struct allocindir *)); -static void initiate_write_filepage __P((struct pagedep *, struct buf *)); -static void handle_written_mkdir __P((struct mkdir *, int)); -static void initiate_write_inodeblock __P((struct inodedep *, struct buf *)); -static void handle_workitem_freefile __P((struct freefile *)); -static void handle_workitem_remove __P((struct dirrem *)); -static struct dirrem *newdirrem __P((struct buf *, struct inode *, - struct inode *, int, struct dirrem **)); -static void free_diradd __P((struct diradd *)); -static void free_allocindir __P((struct allocindir *, struct inodedep *)); -static int indir_trunc __P((struct inode *, ufs_daddr_t, int, ufs_lbn_t, - long *)); -static void deallocate_dependencies __P((struct buf *, struct inodedep *)); -static void free_allocdirect __P((struct allocdirectlst *, - struct allocdirect *, int)); -static int check_inode_unwritten __P((struct inodedep *)); -static int free_inodedep __P((struct inodedep *)); -static void handle_workitem_freeblocks __P((struct freeblks *)); -static void merge_inode_lists __P((struct inodedep *)); -static void setup_allocindir_phase2 __P((struct buf *, struct inode *, - struct allocindir *)); -static struct allocindir *newallocindir __P((struct inode *, int, ufs_daddr_t, - ufs_daddr_t)); -static void handle_workitem_freefrag __P((struct freefrag *)); -static struct freefrag *newfreefrag __P((struct inode *, ufs_daddr_t, long)); -static void allocdirect_merge __P((struct allocdirectlst *, - struct allocdirect *, struct allocdirect *)); -static struct bmsafemap *bmsafemap_lookup __P((struct buf *)); -static int newblk_lookup __P((struct fs *, ufs_daddr_t, int, - struct newblk **)); -static int inodedep_lookup __P((struct fs *, ino_t, int, struct inodedep **)); -static int pagedep_lookup __P((struct inode *, ufs_lbn_t, int, - struct pagedep **)); -static void pause_timer __P((void *)); -static int request_cleanup __P((int, int)); -static void add_to_worklist __P((struct worklist *)); - -/* - * Exported softdep operations. - */ -static void softdep_disk_io_initiation __P((struct buf *)); -static void softdep_disk_write_complete __P((struct buf *)); -static void softdep_deallocate_dependencies __P((struct buf *)); -static int softdep_fsync __P((struct vnode *)); -static int softdep_process_worklist __P((struct mount *)); -static void softdep_move_dependencies __P((struct buf *, struct buf *)); -static int softdep_count_dependencies __P((struct buf *bp, int)); - -struct bio_ops bioops = { - softdep_disk_io_initiation, /* io_start */ - softdep_disk_write_complete, /* io_complete */ - softdep_deallocate_dependencies, /* io_deallocate */ - softdep_fsync, /* io_fsync */ - softdep_process_worklist, /* io_sync */ - softdep_move_dependencies, /* io_movedeps */ - softdep_count_dependencies, /* io_countdeps */ -}; - -/* - * Locking primitives. - * - * For a uniprocessor, all we need to do is protect against disk - * interrupts. For a multiprocessor, this lock would have to be - * a mutex. A single mutex is used throughout this file, though - * finer grain locking could be used if contention warranted it. - * - * For a multiprocessor, the sleep call would accept a lock and - * release it after the sleep processing was complete. In a uniprocessor - * implementation there is no such interlock, so we simple mark - * the places where it needs to be done with the `interlocked' form - * of the lock calls. Since the uniprocessor sleep already interlocks - * the spl, there is nothing that really needs to be done. - */ -#ifndef /* NOT */ DEBUG -static struct lockit { - int lkt_spl; -} lk = { 0 }; -#define ACQUIRE_LOCK(lk) (lk)->lkt_spl = splbio() -#define FREE_LOCK(lk) splx((lk)->lkt_spl) -#define ACQUIRE_LOCK_INTERLOCKED(lk, s) (lk)->lkt_spl = s -#define FREE_LOCK_INTERLOCKED(lk) (lk)->lkt_spl - -#else /* DEBUG */ -static struct lockit { - int lkt_spl; - pid_t lkt_held; -} lk = { 0, -1 }; -static int lockcnt; - -static void acquire_lock __P((struct lockit *)); -static void free_lock __P((struct lockit *)); -static void acquire_lock_interlocked __P((struct lockit *, int)); -static int free_lock_interlocked __P((struct lockit *)); - -#define ACQUIRE_LOCK(lk) acquire_lock(lk) -#define FREE_LOCK(lk) free_lock(lk) -#define ACQUIRE_LOCK_INTERLOCKED(lk, s) acquire_lock_interlocked(lk, s) -#define FREE_LOCK_INTERLOCKED(lk) free_lock_interlocked(lk) - -static void -acquire_lock(lk) - struct lockit *lk; -{ - if (lk->lkt_held != -1) { - if (lk->lkt_held == CURPROC_PID) - panic("softdep_lock: locking against myself"); - else - panic("softdep_lock: lock held by %d", lk->lkt_held); - } - lk->lkt_spl = splbio(); - lk->lkt_held = CURPROC_PID; - lockcnt++; -} - -static void -free_lock(lk) - struct lockit *lk; -{ - - if (lk->lkt_held == -1) - panic("softdep_unlock: lock not held"); - lk->lkt_held = -1; - splx(lk->lkt_spl); -} - -static void -acquire_lock_interlocked(lk, s) - struct lockit *lk; - int s; -{ - if (lk->lkt_held != -1) { - if (lk->lkt_held == CURPROC_PID) - panic("softdep_lock_interlocked: locking against self"); - else - panic("softdep_lock_interlocked: lock held by %d", - lk->lkt_held); - } - lk->lkt_spl = s; - lk->lkt_held = CURPROC_PID; - lockcnt++; -} - -static int -free_lock_interlocked(lk) - struct lockit *lk; -{ - if (lk->lkt_held == -1) - panic("softdep_unlock_interlocked: lock not held"); - lk->lkt_held = -1; - return lk->lkt_spl; -} -#endif /* DEBUG */ - -/* - * Place holder for real semaphores. - */ -struct sema { - int value; - pid_t holder; - char *name; - int prio; - int timo; -}; -static void sema_init __P((struct sema *, char *, int, int)); -static int sema_get __P((struct sema *, struct lockit *)); -static void sema_release __P((struct sema *)); - -static void -sema_init(semap, name, prio, timo) - struct sema *semap; - char *name; - int prio, timo; -{ - - semap->holder = -1; - semap->value = 0; - semap->name = name; - semap->prio = prio; - semap->timo = timo; -} - -static int -sema_get(semap, interlock) - struct sema *semap; - struct lockit *interlock; -{ - int s; - - if (semap->value++ > 0) { - if (interlock != NULL) - s = FREE_LOCK_INTERLOCKED(interlock); - tsleep((caddr_t)semap, semap->prio, semap->name, semap->timo); - if (interlock != NULL) { - ACQUIRE_LOCK_INTERLOCKED(interlock, s); - FREE_LOCK(interlock); - } - return (0); - } - semap->holder = CURPROC_PID; - if (interlock != NULL) - FREE_LOCK(interlock); - return (1); -} - -static void -sema_release(semap) - struct sema *semap; -{ - - if (semap->value <= 0 || semap->holder != CURPROC_PID) - panic("sema_release: not held"); - if (--semap->value > 0) { - semap->value = 0; - wakeup(semap); - } - semap->holder = -1; -} - -/* - * Worklist queue management. - * These routines require that the lock be held. - */ -#ifndef /* NOT */ DEBUG -#define WORKLIST_INSERT(head, item) do { \ - (item)->wk_state |= ONWORKLIST; \ - LIST_INSERT_HEAD(head, item, wk_list); \ -} while (0) -#define WORKLIST_REMOVE(item) do { \ - (item)->wk_state &= ~ONWORKLIST; \ - LIST_REMOVE(item, wk_list); \ -} while (0) -#define WORKITEM_FREE(item, type) FREE(item, DtoM(type)) - -#else /* DEBUG */ -static void worklist_insert __P((struct workhead *, struct worklist *)); -static void worklist_remove __P((struct worklist *)); -static void workitem_free __P((struct worklist *, int)); - -#define WORKLIST_INSERT(head, item) worklist_insert(head, item) -#define WORKLIST_REMOVE(item) worklist_remove(item) -#define WORKITEM_FREE(item, type) workitem_free((struct worklist *)item, type) - -static void -worklist_insert(head, item) - struct workhead *head; - struct worklist *item; -{ - - if (lk.lkt_held == -1) - panic("worklist_insert: lock not held"); - if (item->wk_state & ONWORKLIST) - panic("worklist_insert: already on list"); - item->wk_state |= ONWORKLIST; - LIST_INSERT_HEAD(head, item, wk_list); -} - -static void -worklist_remove(item) - struct worklist *item; -{ - - if (lk.lkt_held == -1) - panic("worklist_remove: lock not held"); - if ((item->wk_state & ONWORKLIST) == 0) - panic("worklist_remove: not on list"); - item->wk_state &= ~ONWORKLIST; - LIST_REMOVE(item, wk_list); -} - -static void -workitem_free(item, type) - struct worklist *item; - int type; -{ - - if (item->wk_state & ONWORKLIST) - panic("workitem_free: still on list"); - if (item->wk_type != type) - panic("workitem_free: type mismatch"); - FREE(item, DtoM(type)); -} -#endif /* DEBUG */ - -/* - * Workitem queue management - */ -static struct workhead softdep_workitem_pending; -static int softdep_worklist_busy; -static int max_softdeps; /* maximum number of structs before slowdown */ -static int tickdelay = 2; /* number of ticks to pause during slowdown */ -static int proc_waiting; /* tracks whether we have a timeout posted */ -static struct callout pause_timer_ch = CALLOUT_INITIALIZER; -static struct proc *filesys_syncer; /* proc of filesystem syncer process */ -static int req_clear_inodedeps; /* syncer process flush some inodedeps */ -#define FLUSH_INODES 1 -static int req_clear_remove; /* syncer process flush some freeblks */ -#define FLUSH_REMOVE 2 -/* - * runtime statistics - */ -static int stat_blk_limit_push; /* number of times block limit neared */ -static int stat_ino_limit_push; /* number of times inode limit neared */ -static int stat_blk_limit_hit; /* number of times block slowdown imposed */ -static int stat_ino_limit_hit; /* number of times inode slowdown imposed */ -static int stat_indir_blk_ptrs; /* bufs redirtied as indir ptrs not written */ -static int stat_inode_bitmap; /* bufs redirtied as inode bitmap not written */ -static int stat_direct_blk_ptrs;/* bufs redirtied as direct ptrs not written */ -static int stat_dir_entry; /* bufs redirtied as dir entry cannot write */ -#ifdef DEBUG -#include <vm/vm.h> -#include <sys/sysctl.h> -struct ctldebug debug20 = { "max_softdeps", &max_softdeps }; -struct ctldebug debug21 = { "tickdelay", &tickdelay }; -struct ctldebug debug23 = { "blk_limit_push", &stat_blk_limit_push }; -struct ctldebug debug24 = { "ino_limit_push", &stat_ino_limit_push }; -struct ctldebug debug25 = { "blk_limit_hit", &stat_blk_limit_hit }; -struct ctldebug debug26 = { "ino_limit_hit", &stat_ino_limit_hit }; -struct ctldebug debug27 = { "indir_blk_ptrs", &stat_indir_blk_ptrs }; -struct ctldebug debug28 = { "inode_bitmap", &stat_inode_bitmap }; -struct ctldebug debug29 = { "direct_blk_ptrs", &stat_direct_blk_ptrs }; -struct ctldebug debug30 = { "dir_entry", &stat_dir_entry }; -#endif /* DEBUG */ - -/* - * Add an item to the end of the work queue. - * This routine requires that the lock be held. - * This is the only routine that adds items to the list. - * The following routine is the only one that removes items - * and does so in order from first to last. - */ -static void -add_to_worklist(wk) - struct worklist *wk; -{ - static struct worklist *worklist_tail; - - if (wk->wk_state & ONWORKLIST) - panic("add_to_worklist: already on list"); - wk->wk_state |= ONWORKLIST; - if (LIST_FIRST(&softdep_workitem_pending) == NULL) - LIST_INSERT_HEAD(&softdep_workitem_pending, wk, wk_list); - else - LIST_INSERT_AFTER(worklist_tail, wk, wk_list); - worklist_tail = wk; -} - -/* - * Process that runs once per second to handle items in the background queue. - * - * Note that we ensure that everything is done in the order in which they - * appear in the queue. The code below depends on this property to ensure - * that blocks of a file are freed before the inode itself is freed. This - * ordering ensures that no new <vfsid, inum, lbn> triples will be generated - * until all the old ones have been purged from the dependency lists. - */ -static int -softdep_process_worklist(matchmnt) - struct mount *matchmnt; -{ - struct proc *p = CURPROC; - struct worklist *wk; - struct fs *matchfs; - int matchcnt; - /* - * Record the process identifier of our caller so that we can give - * this process preferential treatment in request_cleanup below. - */ - filesys_syncer = p; - matchcnt = 0; - matchfs = NULL; - if (matchmnt != NULL) - matchfs = VFSTOUFS(matchmnt)->um_fs; - /* - * There is no danger of having multiple processes run this - * code. It is single threaded solely so that softdep_flushfiles - * (below) can get an accurate count of the number of items - * related to its mount point that are in the list. - */ - if (softdep_worklist_busy && matchmnt == NULL) - return (-1); - /* - * If requested, try removing inode or removal dependencies. - */ - if (req_clear_inodedeps) { - clear_inodedeps(p); - req_clear_inodedeps = 0; - wakeup(&proc_waiting); - } - if (req_clear_remove) { - clear_remove(p); - req_clear_remove = 0; - wakeup(&proc_waiting); - } - ACQUIRE_LOCK(&lk); - while ((wk = LIST_FIRST(&softdep_workitem_pending)) != 0) { - WORKLIST_REMOVE(wk); - FREE_LOCK(&lk); - switch (wk->wk_type) { - - case D_DIRREM: - /* removal of a directory entry */ - if (WK_DIRREM(wk)->dm_mnt == matchmnt) - matchcnt += 1; - handle_workitem_remove(WK_DIRREM(wk)); - break; - - case D_FREEBLKS: - /* releasing blocks and/or fragments from a file */ - if (WK_FREEBLKS(wk)->fb_fs == matchfs) - matchcnt += 1; - handle_workitem_freeblocks(WK_FREEBLKS(wk)); - break; - - case D_FREEFRAG: - /* releasing a fragment when replaced as a file grows */ - if (WK_FREEFRAG(wk)->ff_fs == matchfs) - matchcnt += 1; - handle_workitem_freefrag(WK_FREEFRAG(wk)); - break; - - case D_FREEFILE: - /* releasing an inode when its link count drops to 0 */ - if (WK_FREEFILE(wk)->fx_fs == matchfs) - matchcnt += 1; - handle_workitem_freefile(WK_FREEFILE(wk)); - break; - - default: - panic("%s_process_worklist: Unknown type %s", - "softdep", TYPENAME(wk->wk_type)); - /* NOTREACHED */ - } - if (softdep_worklist_busy && matchmnt == NULL) - return (-1); - /* - * If requested, try removing inode or removal dependencies. - */ - if (req_clear_inodedeps) { - clear_inodedeps(p); - req_clear_inodedeps = 0; - wakeup(&proc_waiting); - } - if (req_clear_remove) { - clear_remove(p); - req_clear_remove = 0; - wakeup(&proc_waiting); - } - ACQUIRE_LOCK(&lk); - } - FREE_LOCK(&lk); - return (matchcnt); -} - -/* - * Move dependencies from one buffer to another. - */ -static void -softdep_move_dependencies(oldbp, newbp) - struct buf *oldbp; - struct buf *newbp; -{ - struct worklist *wk, *wktail; - - if (LIST_FIRST(&newbp->b_dep) != NULL) - panic("softdep_move_dependencies: need merge code"); - wktail = 0; - ACQUIRE_LOCK(&lk); - while ((wk = LIST_FIRST(&oldbp->b_dep)) != NULL) { - LIST_REMOVE(wk, wk_list); - if (wktail == 0) - LIST_INSERT_HEAD(&newbp->b_dep, wk, wk_list); - else - LIST_INSERT_AFTER(wktail, wk, wk_list); - wktail = wk; - } - FREE_LOCK(&lk); -} - -/* - * Purge the work list of all items associated with a particular mount point. - */ -int -softdep_flushfiles(oldmnt, flags, p) - struct mount *oldmnt; - int flags; - struct proc *p; -{ - struct vnode *devvp; - int error, loopcnt; - - /* - * Await our turn to clear out the queue. - */ - while (softdep_worklist_busy) - tsleep(&lbolt, PRIBIO, "softflush", 0); - softdep_worklist_busy = 1; - if ((error = ffs_flushfiles(oldmnt, flags, p)) != 0) { - softdep_worklist_busy = 0; - return (error); - } - /* - * Alternately flush the block device associated with the mount - * point and process any dependencies that the flushing - * creates. In theory, this loop can happen at most twice, - * but we give it a few extra just to be sure. - */ - devvp = VFSTOUFS(oldmnt)->um_devvp; - for (loopcnt = 10; loopcnt > 0; ) { - if (softdep_process_worklist(oldmnt) == 0) { - loopcnt--; - /* - * Do another flush in case any vnodes were brought in - * as part of the cleanup operations. - */ - if ((error = ffs_flushfiles(oldmnt, flags, p)) != 0) - break; - /* - * If we still found nothing to do, we are really done. - */ - if (softdep_process_worklist(oldmnt) == 0) - break; - } - vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); - error = VOP_FSYNC(devvp, p->p_ucred, FSYNC_WAIT, p); - VOP_UNLOCK(devvp, 0); - if (error) - break; - } - softdep_worklist_busy = 0; - /* - * If we are unmounting then it is an error to fail. If we - * are simply trying to downgrade to read-only, then filesystem - * activity can keep us busy forever, so we just fail with EBUSY. - */ - if (loopcnt == 0) { - if (oldmnt->mnt_flag & MNT_UNMOUNT) - panic("softdep_flushfiles: looping"); - error = EBUSY; - } - return (error); -} - -/* - * Structure hashing. - * - * There are three types of structures that can be looked up: - * 1) pagedep structures identified by mount point, inode number, - * and logical block. - * 2) inodedep structures identified by mount point and inode number. - * 3) newblk structures identified by mount point and - * physical block number. - * - * The "pagedep" and "inodedep" dependency structures are hashed - * separately from the file blocks and inodes to which they correspond. - * This separation helps when the in-memory copy of an inode or - * file block must be replaced. It also obviates the need to access - * an inode or file page when simply updating (or de-allocating) - * dependency structures. Lookup of newblk structures is needed to - * find newly allocated blocks when trying to associate them with - * their allocdirect or allocindir structure. - * - * The lookup routines optionally create and hash a new instance when - * an existing entry is not found. - */ -#define DEPALLOC 0x0001 /* allocate structure if lookup fails */ - -/* - * Structures and routines associated with pagedep caching. - */ -LIST_HEAD(pagedep_hashhead, pagedep) *pagedep_hashtbl; -u_long pagedep_hash; /* size of hash table - 1 */ -#define PAGEDEP_HASH(mp, inum, lbn) \ - (&pagedep_hashtbl[((((register_t)(mp)) >> 13) + (inum) + (lbn)) & \ - pagedep_hash]) -static struct sema pagedep_in_progress; - -/* - * Look up a pagedep. Return 1 if found, 0 if not found. - * If not found, allocate if DEPALLOC flag is passed. - * Found or allocated entry is returned in pagedeppp. - * This routine must be called with splbio interrupts blocked. - */ -static int -pagedep_lookup(ip, lbn, flags, pagedeppp) - struct inode *ip; - ufs_lbn_t lbn; - int flags; - struct pagedep **pagedeppp; -{ - struct pagedep *pagedep; - struct pagedep_hashhead *pagedephd; - struct mount *mp; - int i; - -#ifdef DEBUG - if (lk.lkt_held == -1) - panic("pagedep_lookup: lock not held"); -#endif - mp = ITOV(ip)->v_mount; - pagedephd = PAGEDEP_HASH(mp, ip->i_number, lbn); -top: - for (pagedep = LIST_FIRST(pagedephd); pagedep; - pagedep = LIST_NEXT(pagedep, pd_hash)) - if (ip->i_number == pagedep->pd_ino && - lbn == pagedep->pd_lbn && - mp == pagedep->pd_mnt) - break; - if (pagedep) { - *pagedeppp = pagedep; - return (1); - } - if ((flags & DEPALLOC) == 0) { - *pagedeppp = NULL; - return (0); - } - if (sema_get(&pagedep_in_progress, &lk) == 0) { - ACQUIRE_LOCK(&lk); - goto top; - } - MALLOC(pagedep, struct pagedep *, sizeof(struct pagedep), M_PAGEDEP, - M_WAITOK); - bzero(pagedep, sizeof(struct pagedep)); - pagedep->pd_list.wk_type = D_PAGEDEP; - pagedep->pd_mnt = mp; - pagedep->pd_ino = ip->i_number; - pagedep->pd_lbn = lbn; - LIST_INIT(&pagedep->pd_dirremhd); - LIST_INIT(&pagedep->pd_pendinghd); - for (i = 0; i < DAHASHSZ; i++) - LIST_INIT(&pagedep->pd_diraddhd[i]); - ACQUIRE_LOCK(&lk); - LIST_INSERT_HEAD(pagedephd, pagedep, pd_hash); - sema_release(&pagedep_in_progress); - *pagedeppp = pagedep; - return (0); -} - -/* - * Structures and routines associated with inodedep caching. - */ -LIST_HEAD(inodedep_hashhead, inodedep) *inodedep_hashtbl; -static u_long inodedep_hash; /* size of hash table - 1 */ -static long num_inodedep; /* number of inodedep allocated */ -#define INODEDEP_HASH(fs, inum) \ - (&inodedep_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & inodedep_hash]) -static struct sema inodedep_in_progress; - -/* - * Look up a inodedep. Return 1 if found, 0 if not found. - * If not found, allocate if DEPALLOC flag is passed. - * Found or allocated entry is returned in inodedeppp. - * This routine must be called with splbio interrupts blocked. - */ -static int -inodedep_lookup(fs, inum, flags, inodedeppp) - struct fs *fs; - ino_t inum; - int flags; - struct inodedep **inodedeppp; -{ - struct inodedep *inodedep; - struct inodedep_hashhead *inodedephd; - int firsttry; - -#ifdef DEBUG - if (lk.lkt_held == -1) - panic("inodedep_lookup: lock not held"); -#endif - firsttry = 1; - inodedephd = INODEDEP_HASH(fs, inum); -top: - for (inodedep = LIST_FIRST(inodedephd); inodedep; - inodedep = LIST_NEXT(inodedep, id_hash)) - if (inum == inodedep->id_ino && fs == inodedep->id_fs) - break; - if (inodedep) { - *inodedeppp = inodedep; - return (1); - } - if ((flags & DEPALLOC) == 0) { - *inodedeppp = NULL; - return (0); - } - /* - * If we are over our limit, try to improve the situation. - */ - if (num_inodedep > max_softdeps && firsttry && speedup_syncer() == 0 && - request_cleanup(FLUSH_INODES, 1)) { - firsttry = 0; - goto top; - } - if (sema_get(&inodedep_in_progress, &lk) == 0) { - ACQUIRE_LOCK(&lk); - goto top; - } - num_inodedep += 1; - MALLOC(inodedep, struct inodedep *, sizeof(struct inodedep), - M_INODEDEP, M_WAITOK); - inodedep->id_list.wk_type = D_INODEDEP; - inodedep->id_fs = fs; - inodedep->id_ino = inum; - inodedep->id_state = ALLCOMPLETE; - inodedep->id_nlinkdelta = 0; - inodedep->id_savedino = NULL; - inodedep->id_savedsize = -1; - inodedep->id_buf = NULL; - LIST_INIT(&inodedep->id_pendinghd); - LIST_INIT(&inodedep->id_inowait); - LIST_INIT(&inodedep->id_bufwait); - TAILQ_INIT(&inodedep->id_inoupdt); - TAILQ_INIT(&inodedep->id_newinoupdt); - ACQUIRE_LOCK(&lk); - LIST_INSERT_HEAD(inodedephd, inodedep, id_hash); - sema_release(&inodedep_in_progress); - *inodedeppp = inodedep; - return (0); -} - -/* - * Structures and routines associated with newblk caching. - */ -LIST_HEAD(newblk_hashhead, newblk) *newblk_hashtbl; -u_long newblk_hash; /* size of hash table - 1 */ -#define NEWBLK_HASH(fs, inum) \ - (&newblk_hashtbl[((((register_t)(fs)) >> 13) + (inum)) & newblk_hash]) -static struct sema newblk_in_progress; - -/* - * Look up a newblk. Return 1 if found, 0 if not found. - * If not found, allocate if DEPALLOC flag is passed. - * Found or allocated entry is returned in newblkpp. - */ -static int -newblk_lookup(fs, newblkno, flags, newblkpp) - struct fs *fs; - ufs_daddr_t newblkno; - int flags; - struct newblk **newblkpp; -{ - struct newblk *newblk; - struct newblk_hashhead *newblkhd; - - newblkhd = NEWBLK_HASH(fs, newblkno); -top: - for (newblk = LIST_FIRST(newblkhd); newblk; - newblk = LIST_NEXT(newblk, nb_hash)) - if (newblkno == newblk->nb_newblkno && fs == newblk->nb_fs) - break; - if (newblk) { - *newblkpp = newblk; - return (1); - } - if ((flags & DEPALLOC) == 0) { - *newblkpp = NULL; - return (0); - } - if (sema_get(&newblk_in_progress, 0) == 0) - goto top; - MALLOC(newblk, struct newblk *, sizeof(struct newblk), - M_NEWBLK, M_WAITOK); - newblk->nb_state = 0; - newblk->nb_fs = fs; - newblk->nb_newblkno = newblkno; - LIST_INSERT_HEAD(newblkhd, newblk, nb_hash); - sema_release(&newblk_in_progress); - *newblkpp = newblk; - return (0); -} - -/* - * Executed during filesystem system initialization before - * mounting any file systems. - */ -void -softdep_initialize() -{ - - LIST_INIT(&mkdirlisthd); - LIST_INIT(&softdep_workitem_pending); - max_softdeps = desiredvnodes * 4; - pagedep_hashtbl = hashinit(desiredvnodes / 5, M_PAGEDEP, M_WAITOK, - &pagedep_hash); - sema_init(&pagedep_in_progress, "pagedep", PRIBIO, 0); - inodedep_hashtbl = hashinit(desiredvnodes, M_INODEDEP, M_WAITOK, - &inodedep_hash); - sema_init(&inodedep_in_progress, "inodedep", PRIBIO, 0); - newblk_hashtbl = hashinit(64, M_NEWBLK, M_WAITOK, &newblk_hash); - sema_init(&newblk_in_progress, "newblk", PRIBIO, 0); -} - -/* - * Called at mount time to notify the dependency code that a - * filesystem wishes to use it. - * - * Currently only called o re-calculate the sb totals if a filesystem - * previously used soft dependencies. If it is going to be called - * for other purposes, the condition for which it is called should - * be checked. - */ -int -softdep_mount(devvp, mp, fs, cred) - struct vnode *devvp; - struct mount *mp; - struct fs *fs; - struct ucred *cred; -{ - struct csum cstotal; - struct cg *cgp; - struct buf *bp; - int error, cyl; -#ifdef FFS_EI - int needswap = UFS_FSNEEDSWAP(fs); -#endif - - mp->mnt_flag &= ~MNT_ASYNC; - /* - * When doing soft updates, the counters in the - * superblock may have gotten out of sync, so we have - * to scan the cylinder groups and recalculate them. - */ - if ((fs->fs_clean & FS_ISCLEAN) || - (fs->fs_fmod != 0 && (fs->fs_clean & FS_WASCLEAN))) - return (0); - bzero(&cstotal, sizeof cstotal); - for (cyl = 0; cyl < fs->fs_ncg; cyl++) { - if ((error = bread(devvp, fsbtodb(fs, cgtod(fs, cyl)), - fs->fs_cgsize, cred, &bp)) != 0) { - brelse(bp); - return (error); - } - cgp = (struct cg *)bp->b_data; - cstotal.cs_nffree += ufs_rw32(cgp->cg_cs.cs_nffree, needswap); - cstotal.cs_nbfree += ufs_rw32(cgp->cg_cs.cs_nbfree, needswap); - cstotal.cs_nifree += ufs_rw32(cgp->cg_cs.cs_nifree, needswap); - cstotal.cs_ndir += ufs_rw32(cgp->cg_cs.cs_ndir, needswap); - fs->fs_cs(fs, cyl) = cgp->cg_cs; - brelse(bp); - } -#ifdef DEBUG - if (bcmp(&cstotal, &fs->fs_cstotal, sizeof cstotal)) - printf("ffs_mountfs: superblock updated for soft updates\n"); -#endif - bcopy(&cstotal, &fs->fs_cstotal, sizeof cstotal); - return (0); -} - -/* - * Protecting the freemaps (or bitmaps). - * - * To eliminate the need to execute fsck before mounting a file system - * after a power failure, one must (conservatively) guarantee that the - * on-disk copy of the bitmaps never indicate that a live inode or block is - * free. So, when a block or inode is allocated, the bitmap should be - * updated (on disk) before any new pointers. When a block or inode is - * freed, the bitmap should not be updated until all pointers have been - * reset. The latter dependency is handled by the delayed de-allocation - * approach described below for block and inode de-allocation. The former - * dependency is handled by calling the following procedure when a block or - * inode is allocated. When an inode is allocated an "inodedep" is created - * with its DEPCOMPLETE flag cleared until its bitmap is written to disk. - * Each "inodedep" is also inserted into the hash indexing structure so - * that any additional link additions can be made dependent on the inode - * allocation. - * - * The ufs file system maintains a number of free block counts (e.g., per - * cylinder group, per cylinder and per <cylinder, rotational position> pair) - * in addition to the bitmaps. These counts are used to improve efficiency - * during allocation and therefore must be consistent with the bitmaps. - * There is no convenient way to guarantee post-crash consistency of these - * counts with simple update ordering, for two main reasons: (1) The counts - * and bitmaps for a single cylinder group block are not in the same disk - * sector. If a disk write is interrupted (e.g., by power failure), one may - * be written and the other not. (2) Some of the counts are located in the - * superblock rather than the cylinder group block. So, we focus our soft - * updates implementation on protecting the bitmaps. When mounting a - * filesystem, we recompute the auxiliary counts from the bitmaps. - */ - -/* - * Called just after updating the cylinder group block to allocate an inode. - */ -void -softdep_setup_inomapdep(bp, ip, newinum) - struct buf *bp; /* buffer for cylgroup block with inode map */ - struct inode *ip; /* inode related to allocation */ - ino_t newinum; /* new inode number being allocated */ -{ - struct inodedep *inodedep; - struct bmsafemap *bmsafemap; - - /* - * Create a dependency for the newly allocated inode. - * Panic if it already exists as something is seriously wrong. - * Otherwise add it to the dependency list for the buffer holding - * the cylinder group map from which it was allocated. - */ - ACQUIRE_LOCK(&lk); - if (inodedep_lookup(ip->i_fs, newinum, DEPALLOC, &inodedep) != 0) - panic("softdep_setup_inomapdep: found inode"); - inodedep->id_buf = bp; - inodedep->id_state &= ~DEPCOMPLETE; - bmsafemap = bmsafemap_lookup(bp); - LIST_INSERT_HEAD(&bmsafemap->sm_inodedephd, inodedep, id_deps); - FREE_LOCK(&lk); -} - -/* - * Called just after updating the cylinder group block to - * allocate block or fragment. - */ -void -softdep_setup_blkmapdep(bp, fs, newblkno) - struct buf *bp; /* buffer for cylgroup block with block map */ - struct fs *fs; /* filesystem doing allocation */ - ufs_daddr_t newblkno; /* number of newly allocated block */ -{ - struct newblk *newblk; - struct bmsafemap *bmsafemap; - - /* - * Create a dependency for the newly allocated block. - * Add it to the dependency list for the buffer holding - * the cylinder group map from which it was allocated. - */ - if (newblk_lookup(fs, newblkno, DEPALLOC, &newblk) != 0) - panic("softdep_setup_blkmapdep: found block"); - ACQUIRE_LOCK(&lk); - newblk->nb_bmsafemap = bmsafemap = bmsafemap_lookup(bp); - LIST_INSERT_HEAD(&bmsafemap->sm_newblkhd, newblk, nb_deps); - FREE_LOCK(&lk); -} - -/* - * Find the bmsafemap associated with a cylinder group buffer. - * If none exists, create one. The buffer must be locked when - * this routine is called and this routine must be called with - * splbio interrupts blocked. - */ -static struct bmsafemap * -bmsafemap_lookup(bp) - struct buf *bp; -{ - struct bmsafemap *bmsafemap; - struct worklist *wk; - -#ifdef DEBUG - if (lk.lkt_held == -1) - panic("bmsafemap_lookup: lock not held"); -#endif - for (wk = LIST_FIRST(&bp->b_dep); wk; wk = LIST_NEXT(wk, wk_list)) - if (wk->wk_type == D_BMSAFEMAP) - return (WK_BMSAFEMAP(wk)); - FREE_LOCK(&lk); - MALLOC(bmsafemap, struct bmsafemap *, sizeof(struct bmsafemap), - M_BMSAFEMAP, M_WAITOK); - bmsafemap->sm_list.wk_type = D_BMSAFEMAP; - bmsafemap->sm_list.wk_state = 0; - bmsafemap->sm_buf = bp; - LIST_INIT(&bmsafemap->sm_allocdirecthd); - LIST_INIT(&bmsafemap->sm_allocindirhd); - LIST_INIT(&bmsafemap->sm_inodedephd); - LIST_INIT(&bmsafemap->sm_newblkhd); - ACQUIRE_LOCK(&lk); - WORKLIST_INSERT(&bp->b_dep, &bmsafemap->sm_list); - return (bmsafemap); -} - -/* - * Direct block allocation dependencies. - * - * When a new block is allocated, the corresponding disk locations must be - * initialized (with zeros or new data) before the on-disk inode points to - * them. Also, the freemap from which the block was allocated must be - * updated (on disk) before the inode's pointer. These two dependencies are - * independent of each other and are needed for all file blocks and indirect - * blocks that are pointed to directly by the inode. Just before the - * "in-core" version of the inode is updated with a newly allocated block - * number, a procedure (below) is called to setup allocation dependency - * structures. These structures are removed when the corresponding - * dependencies are satisfied or when the block allocation becomes obsolete - * (i.e., the file is deleted, the block is de-allocated, or the block is a - * fragment that gets upgraded). All of these cases are handled in - * procedures described later. - * - * When a file extension causes a fragment to be upgraded, either to a larger - * fragment or to a full block, the on-disk location may change (if the - * previous fragment could not simply be extended). In this case, the old - * fragment must be de-allocated, but not until after the inode's pointer has - * been updated. In most cases, this is handled by later procedures, which - * will construct a "freefrag" structure to be added to the workitem queue - * when the inode update is complete (or obsolete). The main exception to - * this is when an allocation occurs while a pending allocation dependency - * (for the same block pointer) remains. This case is handled in the main - * allocation dependency setup procedure by immediately freeing the - * unreferenced fragments. - */ -void -softdep_setup_allocdirect(ip, lbn, newblkno, oldblkno, newsize, oldsize, bp) - struct inode *ip; /* inode to which block is being added */ - ufs_lbn_t lbn; /* block pointer within inode */ - ufs_daddr_t newblkno; /* disk block number being added */ - ufs_daddr_t oldblkno; /* previous block number, 0 unless frag */ - long newsize; /* size of new block */ - long oldsize; /* size of new block */ - struct buf *bp; /* bp for allocated block */ -{ - struct allocdirect *adp, *oldadp; - struct allocdirectlst *adphead; - struct bmsafemap *bmsafemap; - struct inodedep *inodedep; - struct pagedep *pagedep; - struct newblk *newblk; - - MALLOC(adp, struct allocdirect *, sizeof(struct allocdirect), - M_ALLOCDIRECT, M_WAITOK); - bzero(adp, sizeof(struct allocdirect)); - adp->ad_list.wk_type = D_ALLOCDIRECT; - adp->ad_lbn = lbn; - adp->ad_newblkno = newblkno; - adp->ad_oldblkno = oldblkno; - adp->ad_newsize = newsize; - adp->ad_oldsize = oldsize; - adp->ad_state = ATTACHED; - if (newblkno == oldblkno) - adp->ad_freefrag = NULL; - else - adp->ad_freefrag = newfreefrag(ip, oldblkno, oldsize); - - if (newblk_lookup(ip->i_fs, newblkno, 0, &newblk) == 0) - panic("softdep_setup_allocdirect: lost block"); - - ACQUIRE_LOCK(&lk); - (void) inodedep_lookup(ip->i_fs, ip->i_number, DEPALLOC, &inodedep); - adp->ad_inodedep = inodedep; - - if (newblk->nb_state == DEPCOMPLETE) { - adp->ad_state |= DEPCOMPLETE; - adp->ad_buf = NULL; - } else { - bmsafemap = newblk->nb_bmsafemap; - adp->ad_buf = bmsafemap->sm_buf; - LIST_REMOVE(newblk, nb_deps); - LIST_INSERT_HEAD(&bmsafemap->sm_allocdirecthd, adp, ad_deps); - } - LIST_REMOVE(newblk, nb_hash); - FREE(newblk, M_NEWBLK); - - WORKLIST_INSERT(&bp->b_dep, &adp->ad_list); - if (lbn >= NDADDR) { - /* allocating an indirect block */ - if (oldblkno != 0) - panic("softdep_setup_allocdirect: non-zero indir"); - } else { - /* - * Allocating a direct block. - * - * If we are allocating a directory block, then we must - * allocate an associated pagedep to track additions and - * deletions. - */ - if ((ip->i_ffs_mode & IFMT) == IFDIR && - pagedep_lookup(ip, lbn, DEPALLOC, &pagedep) == 0) - WORKLIST_INSERT(&bp->b_dep, &pagedep->pd_list); - } - /* - * The list of allocdirects must be kept in sorted and ascending - * order so that the rollback routines can quickly determine the - * first uncommitted block (the size of the file stored on disk - * ends at the end of the lowest committed fragment, or if there - * are no fragments, at the end of the highest committed block). - * Since files generally grow, the typical case is that the new - * block is to be added at the end of the list. We speed this - * special case by checking against the last allocdirect in the - * list before laboriously traversing the list looking for the - * insertion point. - */ - adphead = &inodedep->id_newinoupdt; - oldadp = TAILQ_LAST(adphead, allocdirectlst); - if (oldadp == NULL || oldadp->ad_lbn <= lbn) { - /* insert at end of list */ - TAILQ_INSERT_TAIL(adphead, adp, ad_next); - if (oldadp != NULL && oldadp->ad_lbn == lbn) - allocdirect_merge(adphead, adp, oldadp); - FREE_LOCK(&lk); - return; - } - for (oldadp = TAILQ_FIRST(adphead); oldadp; - oldadp = TAILQ_NEXT(oldadp, ad_next)) { - if (oldadp->ad_lbn >= lbn) - break; - } - if (oldadp == NULL) - panic("softdep_setup_allocdirect: lost entry"); - /* insert in middle of list */ - TAILQ_INSERT_BEFORE(oldadp, adp, ad_next); - if (oldadp->ad_lbn == lbn) - allocdirect_merge(adphead, adp, oldadp); - FREE_LOCK(&lk); -} - -/* - * Replace an old allocdirect dependency with a newer one. - * This routine must be called with splbio interrupts blocked. - */ -static void -allocdirect_merge(adphead, newadp, oldadp) - struct allocdirectlst *adphead; /* head of list holding allocdirects */ - struct allocdirect *newadp; /* allocdirect being added */ - struct allocdirect *oldadp; /* existing allocdirect being checked */ -{ - struct freefrag *freefrag; - -#ifdef DEBUG - if (lk.lkt_held == -1) - panic("allocdirect_merge: lock not held"); -#endif - if (newadp->ad_oldblkno != oldadp->ad_newblkno || - newadp->ad_oldsize != oldadp->ad_newsize || - newadp->ad_lbn >= NDADDR) - panic("allocdirect_check: old %d != new %d || lbn %d >= %d", - newadp->ad_oldblkno, oldadp->ad_newblkno, - (int)newadp->ad_lbn, NDADDR); - newadp->ad_oldblkno = oldadp->ad_oldblkno; - newadp->ad_oldsize = oldadp->ad_oldsize; - /* - * If the old dependency had a fragment to free or had never - * previously had a block allocated, then the new dependency - * can immediately post its freefrag and adopt the old freefrag. - * This action is done by swapping the freefrag dependencies. - * The new dependency gains the old one's freefrag, and the - * old one gets the new one and then immediately puts it on - * the worklist when it is freed by free_allocdirect. It is - * not possible to do this swap when the old dependency had a - * non-zero size but no previous fragment to free. This condition - * arises when the new block is an extension of the old block. - * Here, the first part of the fragment allocated to the new - * dependency is part of the block currently claimed on disk by - * the old dependency, so cannot legitimately be freed until the - * conditions for the new dependency are fulfilled. - */ - if (oldadp->ad_freefrag != NULL || oldadp->ad_oldblkno == 0) { - freefrag = newadp->ad_freefrag; - newadp->ad_freefrag = oldadp->ad_freefrag; - oldadp->ad_freefrag = freefrag; - } - free_allocdirect(adphead, oldadp, 0); -} - -/* - * Allocate a new freefrag structure if needed. - */ -static struct freefrag * -newfreefrag(ip, blkno, size) - struct inode *ip; - ufs_daddr_t blkno; - long size; -{ - struct freefrag *freefrag; - struct fs *fs; - - if (blkno == 0) - return (NULL); - fs = ip->i_fs; - if (fragnum(fs, blkno) + numfrags(fs, size) > fs->fs_frag) - panic("newfreefrag: frag size"); - MALLOC(freefrag, struct freefrag *, sizeof(struct freefrag), - M_FREEFRAG, M_WAITOK); - freefrag->ff_list.wk_type = D_FREEFRAG; - freefrag->ff_state = ip->i_ffs_uid & ~ONWORKLIST; /* XXX - used below */ - freefrag->ff_inum = ip->i_number; - freefrag->ff_fs = fs; - freefrag->ff_devvp = ip->i_devvp; - freefrag->ff_blkno = blkno; - freefrag->ff_fragsize = size; - return (freefrag); -} - -/* - * This workitem de-allocates fragments that were replaced during - * file block allocation. - */ -static void -handle_workitem_freefrag(freefrag) - struct freefrag *freefrag; -{ - struct inode tip; - struct vnode vp; - - tip.i_fs = freefrag->ff_fs; - tip.i_devvp = freefrag->ff_devvp; - tip.i_dev = freefrag->ff_devvp->v_rdev; - tip.i_number = freefrag->ff_inum; - tip.i_ffs_uid = freefrag->ff_state & ~ONWORKLIST; /* XXX - set above */ - vp.v_data = &tip; - vp.v_mount = freefrag->ff_devvp->v_specmountpoint; - tip.i_vnode = &vp; - ffs_blkfree(&tip, freefrag->ff_blkno, freefrag->ff_fragsize); - FREE(freefrag, M_FREEFRAG); -} - -/* - * Indirect block allocation dependencies. - * - * The same dependencies that exist for a direct block also exist when - * a new block is allocated and pointed to by an entry in a block of - * indirect pointers. The undo/redo states described above are also - * used here. Because an indirect block contains many pointers that - * may have dependencies, a second copy of the entire in-memory indirect - * block is kept. The buffer cache copy is always completely up-to-date. - * The second copy, which is used only as a source for disk writes, - * contains only the safe pointers (i.e., those that have no remaining - * update dependencies). The second copy is freed when all pointers - * are safe. The cache is not allowed to replace indirect blocks with - * pending update dependencies. If a buffer containing an indirect - * block with dependencies is written, these routines will mark it - * dirty again. It can only be successfully written once all the - * dependencies are removed. The ffs_fsync routine in conjunction with - * softdep_sync_metadata work together to get all the dependencies - * removed so that a file can be successfully written to disk. Three - * procedures are used when setting up indirect block pointer - * dependencies. The division is necessary because of the organization - * of the "balloc" routine and because of the distinction between file - * pages and file metadata blocks. - */ - -/* - * Allocate a new allocindir structure. - */ -static struct allocindir * -newallocindir(ip, ptrno, newblkno, oldblkno) - struct inode *ip; /* inode for file being extended */ - int ptrno; /* offset of pointer in indirect block */ - ufs_daddr_t newblkno; /* disk block number being added */ - ufs_daddr_t oldblkno; /* previous block number, 0 if none */ -{ - struct allocindir *aip; - - MALLOC(aip, struct allocindir *, sizeof(struct allocindir), - M_ALLOCINDIR, M_WAITOK); - bzero(aip, sizeof(struct allocindir)); - aip->ai_list.wk_type = D_ALLOCINDIR; - aip->ai_state = ATTACHED; - aip->ai_offset = ptrno; - aip->ai_newblkno = newblkno; - aip->ai_oldblkno = oldblkno; - aip->ai_freefrag = newfreefrag(ip, oldblkno, ip->i_fs->fs_bsize); - return (aip); -} - -/* - * Called just before setting an indirect block pointer - * to a newly allocated file page. - */ -void -softdep_setup_allocindir_page(ip, lbn, bp, ptrno, newblkno, oldblkno, nbp) - struct inode *ip; /* inode for file being extended */ - ufs_lbn_t lbn; /* allocated block number within file */ - struct buf *bp; /* buffer with indirect blk referencing page */ - int ptrno; /* offset of pointer in indirect block */ - ufs_daddr_t newblkno; /* disk block number being added */ - ufs_daddr_t oldblkno; /* previous block number, 0 if none */ - struct buf *nbp; /* buffer holding allocated page */ -{ - struct allocindir *aip; - struct pagedep *pagedep; - - aip = newallocindir(ip, ptrno, newblkno, oldblkno); - ACQUIRE_LOCK(&lk); - /* - * If we are allocating a directory page, then we must - * allocate an associated pagedep to track additions and - * deletions. - */ - if ((ip->i_ffs_mode & IFMT) == IFDIR && - pagedep_lookup(ip, lbn, DEPALLOC, &pagedep) == 0) - WORKLIST_INSERT(&nbp->b_dep, &pagedep->pd_list); - WORKLIST_INSERT(&nbp->b_dep, &aip->ai_list); - FREE_LOCK(&lk); - setup_allocindir_phase2(bp, ip, aip); -} - -/* - * Called just before setting an indirect block pointer to a - * newly allocated indirect block. - */ -void -softdep_setup_allocindir_meta(nbp, ip, bp, ptrno, newblkno) - struct buf *nbp; /* newly allocated indirect block */ - struct inode *ip; /* inode for file being extended */ - struct buf *bp; /* indirect block referencing allocated block */ - int ptrno; /* offset of pointer in indirect block */ - ufs_daddr_t newblkno; /* disk block number being added */ -{ - struct allocindir *aip; - - aip = newallocindir(ip, ptrno, newblkno, 0); - ACQUIRE_LOCK(&lk); - WORKLIST_INSERT(&nbp->b_dep, &aip->ai_list); - FREE_LOCK(&lk); - setup_allocindir_phase2(bp, ip, aip); -} - -/* - * Called to finish the allocation of the "aip" allocated - * by one of the two routines above. - */ -static void -setup_allocindir_phase2(bp, ip, aip) - struct buf *bp; /* in-memory copy of the indirect block */ - struct inode *ip; /* inode for file being extended */ - struct allocindir *aip; /* allocindir allocated by the above routines */ -{ - struct worklist *wk; - struct indirdep *indirdep, *newindirdep; - struct bmsafemap *bmsafemap; - struct allocindir *oldaip; - struct freefrag *freefrag; - struct newblk *newblk; - - if (bp->b_lblkno >= 0) - panic("setup_allocindir_phase2: not indir blk"); - for (indirdep = NULL, newindirdep = NULL; ; ) { - ACQUIRE_LOCK(&lk); - for (wk = LIST_FIRST(&bp->b_dep); wk; - wk = LIST_NEXT(wk, wk_list)) { - if (wk->wk_type != D_INDIRDEP) - continue; - indirdep = WK_INDIRDEP(wk); - break; - } - if (indirdep == NULL && newindirdep) { - indirdep = newindirdep; - WORKLIST_INSERT(&bp->b_dep, &indirdep->ir_list); - newindirdep = NULL; - } - FREE_LOCK(&lk); - if (indirdep) { - if (newblk_lookup(ip->i_fs, aip->ai_newblkno, 0, - &newblk) == 0) - panic("setup_allocindir: lost block"); - ACQUIRE_LOCK(&lk); - if (newblk->nb_state == DEPCOMPLETE) { - aip->ai_state |= DEPCOMPLETE; - aip->ai_buf = NULL; - } else { - bmsafemap = newblk->nb_bmsafemap; - aip->ai_buf = bmsafemap->sm_buf; - LIST_REMOVE(newblk, nb_deps); - LIST_INSERT_HEAD(&bmsafemap->sm_allocindirhd, - aip, ai_deps); - } - LIST_REMOVE(newblk, nb_hash); - FREE(newblk, M_NEWBLK); - aip->ai_indirdep = indirdep; - /* - * Check to see if there is an existing dependency - * for this block. If there is, merge the old - * dependency into the new one. - */ - if (aip->ai_oldblkno == 0) - oldaip = NULL; - else - for (oldaip=LIST_FIRST(&indirdep->ir_deplisthd); - oldaip; oldaip = LIST_NEXT(oldaip, ai_next)) - if (oldaip->ai_offset == aip->ai_offset) - break; - if (oldaip != NULL) { - if (oldaip->ai_newblkno != aip->ai_oldblkno) - panic("setup_allocindir_phase2: blkno"); - aip->ai_oldblkno = oldaip->ai_oldblkno; - freefrag = oldaip->ai_freefrag; - oldaip->ai_freefrag = aip->ai_freefrag; - aip->ai_freefrag = freefrag; - free_allocindir(oldaip, NULL); - } - LIST_INSERT_HEAD(&indirdep->ir_deplisthd, aip, ai_next); - ((ufs_daddr_t *)indirdep->ir_savebp->b_data) - [aip->ai_offset] = aip->ai_oldblkno; - FREE_LOCK(&lk); - } - if (newindirdep) { - if (indirdep->ir_savebp != NULL) - brelse(newindirdep->ir_savebp); - WORKITEM_FREE((caddr_t)newindirdep, D_INDIRDEP); - } - if (indirdep) - break; - MALLOC(newindirdep, struct indirdep *, sizeof(struct indirdep), - M_INDIRDEP, M_WAITOK); - newindirdep->ir_list.wk_type = D_INDIRDEP; - newindirdep->ir_state = ATTACHED; - LIST_INIT(&newindirdep->ir_deplisthd); - LIST_INIT(&newindirdep->ir_donehd); - if (bp->b_blkno == bp->b_lblkno) { - VOP_BMAP(bp->b_vp, bp->b_lblkno, NULL, &bp->b_blkno, - NULL); - } - newindirdep->ir_savebp = - getblk(ip->i_devvp, bp->b_blkno, bp->b_bcount, 0, 0); - newindirdep->ir_savebp->b_flags |= B_ASYNC; - bcopy(bp->b_data, newindirdep->ir_savebp->b_data, bp->b_bcount); - } -} - -/* - * Block de-allocation dependencies. - * - * When blocks are de-allocated, the on-disk pointers must be nullified before - * the blocks are made available for use by other files. (The true - * requirement is that old pointers must be nullified before new on-disk - * pointers are set. We chose this slightly more stringent requirement to - * reduce complexity.) Our implementation handles this dependency by updating - * the inode (or indirect block) appropriately but delaying the actual block - * de-allocation (i.e., freemap and free space count manipulation) until - * after the updated versions reach stable storage. After the disk is - * updated, the blocks can be safely de-allocated whenever it is convenient. - * This implementation handles only the common case of reducing a file's - * length to zero. Other cases are handled by the conventional synchronous - * write approach. - * - * The ffs implementation with which we worked double-checks - * the state of the block pointers and file size as it reduces - * a file's length. Some of this code is replicated here in our - * soft updates implementation. The freeblks->fb_chkcnt field is - * used to transfer a part of this information to the procedure - * that eventually de-allocates the blocks. - * - * This routine should be called from the routine that shortens - * a file's length, before the inode's size or block pointers - * are modified. It will save the block pointer information for - * later release and zero the inode so that the calling routine - * can release it. - */ -void -softdep_setup_freeblocks(ip, length) - struct inode *ip; /* The inode whose length is to be reduced */ - off_t length; /* The new length for the file */ -{ - struct freeblks *freeblks; - struct inodedep *inodedep; - struct allocdirect *adp; - struct vnode *vp; - struct buf *bp; - struct fs *fs = ip->i_fs; - int i, error; -#ifdef FFS_EI - const int needswap = UFS_FSNEEDSWAP(fs); -#endif - - if (length != 0) - panic("softdep_setup_freeblocks: non-zero length"); - MALLOC(freeblks, struct freeblks *, sizeof(struct freeblks), - M_FREEBLKS, M_WAITOK); - bzero(freeblks, sizeof(struct freeblks)); - freeblks->fb_list.wk_type = D_FREEBLKS; - freeblks->fb_uid = ip->i_ffs_uid; - freeblks->fb_previousinum = ip->i_number; - freeblks->fb_devvp = ip->i_devvp; - freeblks->fb_fs = fs; - freeblks->fb_oldsize = ip->i_ffs_size; - freeblks->fb_newsize = length; - freeblks->fb_chkcnt = ip->i_ffs_blocks; - for (i = 0; i < NDADDR; i++) { - freeblks->fb_dblks[i] = ufs_rw32(ip->i_ffs_db[i], needswap); - ip->i_ffs_db[i] = 0; - } - for (i = 0; i < NIADDR; i++) { - freeblks->fb_iblks[i] = ufs_rw32(ip->i_ffs_ib[i], needswap); - ip->i_ffs_ib[i] = 0; - } - ip->i_ffs_blocks = 0; - ip->i_ffs_size = 0; - /* - * Push the zero'ed inode to to its disk buffer so that we are free - * to delete its dependencies below. Once the dependencies are gone - * the buffer can be safely released. - */ - if ((error = bread(ip->i_devvp, - fsbtodb(fs, ino_to_fsba(fs, ip->i_number)), - (int)fs->fs_bsize, NOCRED, &bp)) != 0) - softdep_error("softdep_setup_freeblocks", error); -#ifdef FFS_EI - if (needswap) - ffs_dinode_swap(&ip->i_din.ffs_din, - (struct dinode *)bp->b_data+ino_to_fsbo(fs, ip->i_number)); - else -#endif - *((struct dinode *)bp->b_data + ino_to_fsbo(fs, ip->i_number)) = - ip->i_din.ffs_din; - /* - * Find and eliminate any inode dependencies. - */ - ACQUIRE_LOCK(&lk); - (void) inodedep_lookup(fs, ip->i_number, DEPALLOC, &inodedep); - if ((inodedep->id_state & IOSTARTED) != 0) - panic("softdep_setup_freeblocks: inode busy"); - /* - * Because the file length has been truncated to zero, any - * pending block allocation dependency structures associated - * with this inode are obsolete and can simply be de-allocated. - * We must first merge the two dependency lists to get rid of - * any duplicate freefrag structures, then purge the merged list. - */ - merge_inode_lists(inodedep); - while ((adp = TAILQ_FIRST(&inodedep->id_inoupdt)) != 0) - free_allocdirect(&inodedep->id_inoupdt, adp, 1); - FREE_LOCK(&lk); - bdwrite(bp); - /* - * We must wait for any I/O in progress to finish so that - * all potential buffers on the dirty list will be visible. - * Once they are all there, walk the list and get rid of - * any dependencies. - */ - vp = ITOV(ip); - ACQUIRE_LOCK(&lk); - drain_output(vp, 1); - while (getdirtybuf(&vp->v_dirtyblkhd.lh_first, MNT_WAIT)) { - bp = vp->v_dirtyblkhd.lh_first; - (void) inodedep_lookup(fs, ip->i_number, 0, &inodedep); - deallocate_dependencies(bp, inodedep); - bp->b_flags |= B_INVAL | B_NOCACHE; - FREE_LOCK(&lk); - brelse(bp); - ACQUIRE_LOCK(&lk); - } - /* - * Add the freeblks structure to the list of operations that - * must await the zero'ed inode being written to disk. If we - * still have a bitmap dependency, then the inode has never been - * written to disk, so we can process the freeblks immediately. - * If the inodedep does not exist, then the zero'ed inode has - * been written and we can also proceed. - */ - if (inodedep_lookup(fs, ip->i_number, 0, &inodedep) == 0 || - free_inodedep(inodedep) || - (inodedep->id_state & DEPCOMPLETE) == 0) { - FREE_LOCK(&lk); - handle_workitem_freeblocks(freeblks); - } else { - WORKLIST_INSERT(&inodedep->id_bufwait, &freeblks->fb_list); - FREE_LOCK(&lk); - } -} - -/* - * Reclaim any dependency structures from a buffer that is about to - * be reallocated to a new vnode. The buffer must be locked, thus, - * no I/O completion operations can occur while we are manipulating - * its associated dependencies. The mutex is held so that other I/O's - * associated with related dependencies do not occur. - */ -static void -deallocate_dependencies(bp, inodedep) - struct buf *bp; - struct inodedep *inodedep; -{ - struct worklist *wk; - struct indirdep *indirdep; - struct allocindir *aip; - struct pagedep *pagedep; - struct dirrem *dirrem; - struct diradd *dap; - int i; - - while ((wk = LIST_FIRST(&bp->b_dep)) != NULL) { - switch (wk->wk_type) { - - case D_INDIRDEP: - indirdep = WK_INDIRDEP(wk); - /* - * None of the indirect pointers will ever be visible, - * so they can simply be tossed. GOINGAWAY ensures - * that allocated pointers will be saved in the buffer - * cache until they are freed. Note that they will - * only be able to be found by their physical address - * since the inode mapping the logical address will - * be gone. The save buffer used for the safe copy - * was allocated in setup_allocindir_phase2 using - * the physical address so it could be used for this - * purpose. Hence we swap the safe copy with the real - * copy, allowing the safe copy to be freed and holding - * on to the real copy for later use in indir_trunc. - */ - if (indirdep->ir_state & GOINGAWAY) - panic("deallocate_dependencies: already gone"); - indirdep->ir_state |= GOINGAWAY; - while ((aip = LIST_FIRST(&indirdep->ir_deplisthd)) != 0) - free_allocindir(aip, inodedep); - if (bp->b_lblkno >= 0 || - bp->b_blkno != indirdep->ir_savebp->b_lblkno) - panic("deallocate_dependencies: not indir"); - bcopy(bp->b_data, indirdep->ir_savebp->b_data, - bp->b_bcount); - WORKLIST_REMOVE(wk); - WORKLIST_INSERT(&indirdep->ir_savebp->b_dep, wk); - continue; - - case D_PAGEDEP: - pagedep = WK_PAGEDEP(wk); - /* - * None of the directory additions will ever be - * visible, so they can simply be tossed. - */ - for (i = 0; i < DAHASHSZ; i++) - while ((dap = - LIST_FIRST(&pagedep->pd_diraddhd[i]))) - free_diradd(dap); - while ((dap = LIST_FIRST(&pagedep->pd_pendinghd)) != 0) - free_diradd(dap); - /* - * Copy any directory remove dependencies to the list - * to be processed after the zero'ed inode is written. - * If the inode has already been written, then they - * can be dumped directly onto the work list. - */ - for (dirrem = LIST_FIRST(&pagedep->pd_dirremhd); dirrem; - dirrem = LIST_NEXT(dirrem, dm_next)) { - LIST_REMOVE(dirrem, dm_next); - dirrem->dm_dirinum = pagedep->pd_ino; - if (inodedep == NULL || - (inodedep->id_state & ALLCOMPLETE) == - ALLCOMPLETE) - add_to_worklist(&dirrem->dm_list); - else - WORKLIST_INSERT(&inodedep->id_bufwait, - &dirrem->dm_list); - } - WORKLIST_REMOVE(&pagedep->pd_list); - LIST_REMOVE(pagedep, pd_hash); - WORKITEM_FREE(pagedep, D_PAGEDEP); - continue; - - case D_ALLOCINDIR: - free_allocindir(WK_ALLOCINDIR(wk), inodedep); - continue; - - case D_ALLOCDIRECT: - case D_INODEDEP: - panic("deallocate_dependencies: Unexpected type %s", - TYPENAME(wk->wk_type)); - /* NOTREACHED */ - - default: - panic("deallocate_dependencies: Unknown type %s", - TYPENAME(wk->wk_type)); - /* NOTREACHED */ - } - } -} - -/* - * Free an allocdirect. Generate a new freefrag work request if appropriate. - * This routine must be called with splbio interrupts blocked. - */ -static void -free_allocdirect(adphead, adp, delay) - struct allocdirectlst *adphead; - struct allocdirect *adp; - int delay; -{ - -#ifdef DEBUG - if (lk.lkt_held == -1) - panic("free_allocdirect: lock not held"); -#endif - if ((adp->ad_state & DEPCOMPLETE) == 0) - LIST_REMOVE(adp, ad_deps); - TAILQ_REMOVE(adphead, adp, ad_next); - if ((adp->ad_state & COMPLETE) == 0) - WORKLIST_REMOVE(&adp->ad_list); - if (adp->ad_freefrag != NULL) { - if (delay) - WORKLIST_INSERT(&adp->ad_inodedep->id_bufwait, - &adp->ad_freefrag->ff_list); - else - add_to_worklist(&adp->ad_freefrag->ff_list); - } - WORKITEM_FREE(adp, D_ALLOCDIRECT); -} - -/* - * Prepare an inode to be freed. The actual free operation is not - * done until the zero'ed inode has been written to disk. - */ -void -softdep_freefile(v) - void *v; -{ - struct vop_vfree_args /* { - struct vnode *a_pvp; - ino_t a_ino; - int a_mode; - } */ *ap = v; - struct inode *ip = VTOI(ap->a_pvp); - struct inodedep *inodedep; - struct freefile *freefile; - - /* - * This sets up the inode de-allocation dependency. - */ - MALLOC(freefile, struct freefile *, sizeof(struct freefile), - M_FREEFILE, M_WAITOK); - freefile->fx_list.wk_type = D_FREEFILE; - freefile->fx_list.wk_state = 0; - freefile->fx_mode = ap->a_mode; - freefile->fx_oldinum = ap->a_ino; - freefile->fx_devvp = ip->i_devvp; - freefile->fx_fs = ip->i_fs; - - /* - * If the inodedep does not exist, then the zero'ed inode has - * been written to disk. If the allocated inode has never been - * written to disk, then the on-disk inode is zero'ed. In either - * case we can free the file immediately. - */ - ACQUIRE_LOCK(&lk); - if (inodedep_lookup(ip->i_fs, ap->a_ino, 0, &inodedep) == 0 || - check_inode_unwritten(inodedep)) { - FREE_LOCK(&lk); - handle_workitem_freefile(freefile); - return; - } - WORKLIST_INSERT(&inodedep->id_inowait, &freefile->fx_list); - FREE_LOCK(&lk); -} - -/* - * Check to see if an inode has never been written to disk. If - * so free the inodedep and return success, otherwise return failure. - * This routine must be called with splbio interrupts blocked. - * - * If we still have a bitmap dependency, then the inode has never - * been written to disk. Drop the dependency as it is no longer - * necessary since the inode is being deallocated. We set the - * ALLCOMPLETE flags since the bitmap now properly shows that the - * inode is not allocated. Even if the inode is actively being - * written, it has been rolled back to its zero'ed state, so we - * are ensured that a zero inode is what is on the disk. For short - * lived files, this change will usually result in removing all the - * dependencies from the inode so that it can be freed immediately. - */ -static int -check_inode_unwritten(inodedep) - struct inodedep *inodedep; -{ - - if ((inodedep->id_state & DEPCOMPLETE) != 0 || - LIST_FIRST(&inodedep->id_pendinghd) != NULL || - LIST_FIRST(&inodedep->id_bufwait) != NULL || - LIST_FIRST(&inodedep->id_inowait) != NULL || - TAILQ_FIRST(&inodedep->id_inoupdt) != NULL || - TAILQ_FIRST(&inodedep->id_newinoupdt) != NULL || - inodedep->id_nlinkdelta != 0) - return (0); - inodedep->id_state |= ALLCOMPLETE; - LIST_REMOVE(inodedep, id_deps); - inodedep->id_buf = NULL; - WORKLIST_REMOVE(&inodedep->id_list); - if (inodedep->id_savedino != NULL) { - FREE(inodedep->id_savedino, M_INODEDEP); - inodedep->id_savedino = NULL; - } - if (free_inodedep(inodedep) == 0) - panic("check_inode_unwritten: busy inode"); - return (1); -} - -/* - * Try to free an inodedep structure. Return 1 if it could be freed. - */ -static int -free_inodedep(inodedep) - struct inodedep *inodedep; -{ - - if ((inodedep->id_state & ONWORKLIST) != 0 || - (inodedep->id_state & ALLCOMPLETE) != ALLCOMPLETE || - LIST_FIRST(&inodedep->id_pendinghd) != NULL || - LIST_FIRST(&inodedep->id_bufwait) != NULL || - LIST_FIRST(&inodedep->id_inowait) != NULL || - TAILQ_FIRST(&inodedep->id_inoupdt) != NULL || - TAILQ_FIRST(&inodedep->id_newinoupdt) != NULL || - inodedep->id_nlinkdelta != 0 || inodedep->id_savedino != NULL) - return (0); - LIST_REMOVE(inodedep, id_hash); - WORKITEM_FREE(inodedep, D_INODEDEP); - num_inodedep -= 1; - return (1); -} - -/* - * This workitem routine performs the block de-allocation. - * The workitem is added to the pending list after the updated - * inode block has been written to disk. As mentioned above, - * checks regarding the number of blocks de-allocated (compared - * to the number of blocks allocated for the file) are also - * performed in this function. - */ -static void -handle_workitem_freeblocks(freeblks) - struct freeblks *freeblks; -{ - struct inode tip; - struct vnode vp; - ufs_daddr_t bn; - struct fs *fs; - int i, level, bsize; - long nblocks, blocksreleased = 0; - int error, allerror = 0; - ufs_lbn_t baselbns[NIADDR], tmpval; - - tip.i_number = freeblks->fb_previousinum; - tip.i_devvp = freeblks->fb_devvp; - tip.i_dev = freeblks->fb_devvp->v_rdev; - tip.i_fs = freeblks->fb_fs; - tip.i_ffs_size = freeblks->fb_oldsize; - tip.i_ffs_uid = freeblks->fb_uid; - vp.v_data = &tip; - vp.v_mount = freeblks->fb_devvp->v_specmountpoint; - tip.i_vnode = &vp; - fs = freeblks->fb_fs; - tmpval = 1; - baselbns[0] = NDADDR; - for (i = 1; i < NIADDR; i++) { - tmpval *= NINDIR(fs); - baselbns[i] = baselbns[i - 1] + tmpval; - } - nblocks = btodb(fs->fs_bsize); - blocksreleased = 0; - /* - * Indirect blocks first. - */ - for (level = (NIADDR - 1); level >= 0; level--) { - if ((bn = freeblks->fb_iblks[level]) == 0) - continue; - if ((error = indir_trunc(&tip, fsbtodb(fs, bn), level, - baselbns[level], &blocksreleased)) == 0) - allerror = error; - ffs_blkfree(&tip, bn, fs->fs_bsize); - blocksreleased += nblocks; - } - /* - * All direct blocks or frags. - */ - for (i = (NDADDR - 1); i >= 0; i--) { - if ((bn = freeblks->fb_dblks[i]) == 0) - continue; - bsize = blksize(fs, &tip, i); - ffs_blkfree(&tip, bn, bsize); - blocksreleased += btodb(bsize); - } - -#ifdef DIAGNOSTIC - if (freeblks->fb_chkcnt != blocksreleased) - panic("handle_workitem_freeblocks: block count"); - if (allerror) - softdep_error("handle_workitem_freeblks", allerror); -#endif /* DIAGNOSTIC */ - WORKITEM_FREE(freeblks, D_FREEBLKS); -} - -/* - * Release blocks associated with the inode ip and stored in the indirect - * block dbn. If level is greater than SINGLE, the block is an indirect block - * and recursive calls to indirtrunc must be used to cleanse other indirect - * blocks. - */ -static int -indir_trunc(ip, dbn, level, lbn, countp) - struct inode *ip; - ufs_daddr_t dbn; - int level; - ufs_lbn_t lbn; - long *countp; -{ - struct buf *bp; - ufs_daddr_t *bap; - ufs_daddr_t nb; - struct fs *fs = ip->i_fs; - struct worklist *wk; - struct indirdep *indirdep; - int i, lbnadd, nblocks; - int error, allerror = 0; -#ifdef FFS_EI - const int needswap = UFS_FSNEEDSWAP(fs); -#endif - - lbnadd = 1; - for (i = level; i > 0; i--) - lbnadd *= NINDIR(fs); - /* - * Get buffer of block pointers to be freed. This routine is not - * called until the zero'ed inode has been written, so it is safe - * to free blocks as they are encountered. Because the inode has - * been zero'ed, calls to bmap on these blocks will fail. So, we - * have to use the on-disk address and the block device for the - * filesystem to look them up. If the file was deleted before its - * indirect blocks were all written to disk, the routine that set - * us up (deallocate_dependencies) will have arranged to leave - * a complete copy of the indirect block in memory for our use. - * Otherwise we have to read the blocks in from the disk. - */ - ACQUIRE_LOCK(&lk); - if ((bp = incore(ip->i_devvp, dbn)) != NULL && - (wk = LIST_FIRST(&bp->b_dep)) != NULL) { - if (wk->wk_type != D_INDIRDEP || - (indirdep = WK_INDIRDEP(wk))->ir_savebp != bp || - (indirdep->ir_state & GOINGAWAY) == 0) - panic("indir_trunc: lost indirdep"); - WORKLIST_REMOVE(wk); - WORKITEM_FREE(indirdep, D_INDIRDEP); - if (LIST_FIRST(&bp->b_dep) != NULL) - panic("indir_trunc: dangling dep"); - FREE_LOCK(&lk); - } else { - FREE_LOCK(&lk); - error = bread(ip->i_devvp, dbn, (int)fs->fs_bsize, NOCRED, &bp); - if (error) - return (error); - } - /* - * Recursively free indirect blocks. - */ - bap = (ufs_daddr_t *)bp->b_data; - nblocks = btodb(fs->fs_bsize); - for (i = NINDIR(fs) - 1; i >= 0; i--) { - if ((nb = ufs_rw32(bap[i], needswap)) == 0) - continue; - if (level != 0) { - if ((error = indir_trunc(ip, fsbtodb(fs, nb), - level - 1, lbn + (i * lbnadd), countp)) != 0) - allerror = error; - } - ffs_blkfree(ip, nb, fs->fs_bsize); - *countp += nblocks; - } - bp->b_flags |= B_INVAL | B_NOCACHE; - brelse(bp); - return (allerror); -} - -/* - * Free an allocindir. - * This routine must be called with splbio interrupts blocked. - */ -static void -free_allocindir(aip, inodedep) - struct allocindir *aip; - struct inodedep *inodedep; -{ - struct freefrag *freefrag; - -#ifdef DEBUG - if (lk.lkt_held == -1) - panic("free_allocindir: lock not held"); -#endif - if ((aip->ai_state & DEPCOMPLETE) == 0) - LIST_REMOVE(aip, ai_deps); - if (aip->ai_state & ONWORKLIST) - WORKLIST_REMOVE(&aip->ai_list); - LIST_REMOVE(aip, ai_next); - if ((freefrag = aip->ai_freefrag) != NULL) { - if (inodedep == NULL) - add_to_worklist(&freefrag->ff_list); - else - WORKLIST_INSERT(&inodedep->id_bufwait, - &freefrag->ff_list); - } - WORKITEM_FREE(aip, D_ALLOCINDIR); -} - -/* - * Directory entry addition dependencies. - * - * When adding a new directory entry, the inode (with its incremented link - * count) must be written to disk before the directory entry's pointer to it. - * Also, if the inode is newly allocated, the corresponding freemap must be - * updated (on disk) before the directory entry's pointer. These requirements - * are met via undo/redo on the directory entry's pointer, which consists - * simply of the inode number. - * - * As directory entries are added and deleted, the free space within a - * directory block can become fragmented. The ufs file system will compact - * a fragmented directory block to make space for a new entry. When this - * occurs, the offsets of previously added entries change. Any "diradd" - * dependency structures corresponding to these entries must be updated with - * the new offsets. - */ - -/* - * This routine is called after the in-memory inode's link - * count has been incremented, but before the directory entry's - * pointer to the inode has been set. - */ -void -softdep_setup_directory_add(bp, dp, diroffset, newinum, newdirbp) - struct buf *bp; /* buffer containing directory block */ - struct inode *dp; /* inode for directory */ - off_t diroffset; /* offset of new entry in directory */ - long newinum; /* inode referenced by new directory entry */ - struct buf *newdirbp; /* non-NULL => contents of new mkdir */ -{ - int offset; /* offset of new entry within directory block */ - ufs_lbn_t lbn; /* block in directory containing new entry */ - struct fs *fs; - struct diradd *dap; - struct pagedep *pagedep; - struct inodedep *inodedep; - struct mkdir *mkdir1 = NULL, *mkdir2 = NULL; - - /* - * Whiteouts have no dependencies. - */ - if (newinum == WINO) { - if (newdirbp != NULL) - bdwrite(newdirbp); - return; - } - - fs = dp->i_fs; - lbn = lblkno(fs, diroffset); - offset = blkoff(fs, diroffset); - MALLOC(dap, struct diradd *, sizeof(struct diradd), M_DIRADD, M_WAITOK); - bzero(dap, sizeof(struct diradd)); - dap->da_list.wk_type = D_DIRADD; - dap->da_state = ATTACHED; - dap->da_offset = offset; - dap->da_newinum = newinum; - if (newdirbp == NULL) { - dap->da_state |= DEPCOMPLETE; - ACQUIRE_LOCK(&lk); - } else { - dap->da_state |= MKDIR_BODY | MKDIR_PARENT; - MALLOC(mkdir1, struct mkdir *, sizeof(struct mkdir), M_MKDIR, - M_WAITOK); - mkdir1->md_list.wk_type = D_MKDIR; - mkdir1->md_state = MKDIR_BODY; - mkdir1->md_diradd = dap; - MALLOC(mkdir2, struct mkdir *, sizeof(struct mkdir), M_MKDIR, - M_WAITOK); - mkdir2->md_list.wk_type = D_MKDIR; - mkdir2->md_state = MKDIR_PARENT; - mkdir2->md_diradd = dap; - /* - * Dependency on "." and ".." being written to disk. - */ - mkdir1->md_buf = newdirbp; - ACQUIRE_LOCK(&lk); - LIST_INSERT_HEAD(&mkdirlisthd, mkdir1, md_mkdirs); - WORKLIST_INSERT(&newdirbp->b_dep, &mkdir1->md_list); - FREE_LOCK(&lk); - bdwrite(newdirbp); - /* - * Dependency on link count increase for parent directory - */ - ACQUIRE_LOCK(&lk); - if (inodedep_lookup(dp->i_fs, dp->i_number, 0, &inodedep) == 0 - || (inodedep->id_state & ALLCOMPLETE) == ALLCOMPLETE) { - dap->da_state &= ~MKDIR_PARENT; - WORKITEM_FREE(mkdir2, D_MKDIR); - } else { - LIST_INSERT_HEAD(&mkdirlisthd, mkdir2, md_mkdirs); - WORKLIST_INSERT(&inodedep->id_bufwait,&mkdir2->md_list); - } - } - /* - * Link into parent directory pagedep to await its being written. - */ - if (pagedep_lookup(dp, lbn, DEPALLOC, &pagedep) == 0) - WORKLIST_INSERT(&bp->b_dep, &pagedep->pd_list); - dap->da_pagedep = pagedep; - LIST_INSERT_HEAD(&pagedep->pd_diraddhd[DIRADDHASH(offset)], dap, - da_pdlist); - /* - * Link into its inodedep. Put it on the id_bufwait list if the inode - * is not yet written. If it is written, do the post-inode write - * processing to put it on the id_pendinghd list. - */ - (void) inodedep_lookup(fs, newinum, DEPALLOC, &inodedep); - if ((inodedep->id_state & ALLCOMPLETE) == ALLCOMPLETE) - diradd_inode_written(dap, inodedep); - else - WORKLIST_INSERT(&inodedep->id_bufwait, &dap->da_list); - FREE_LOCK(&lk); -} - -/* - * This procedure is called to change the offset of a directory - * entry when compacting a directory block which must be owned - * exclusively by the caller. Note that the actual entry movement - * must be done in this procedure to ensure that no I/O completions - * occur while the move is in progress. - */ -void -softdep_change_directoryentry_offset(dp, base, oldloc, newloc, entrysize) - struct inode *dp; /* inode for directory */ - caddr_t base; /* address of dp->i_offset */ - caddr_t oldloc; /* address of old directory location */ - caddr_t newloc; /* address of new directory location */ - int entrysize; /* size of directory entry */ -{ - int offset, oldoffset, newoffset; - struct pagedep *pagedep; - struct diradd *dap; - ufs_lbn_t lbn; - - ACQUIRE_LOCK(&lk); - lbn = lblkno(dp->i_fs, dp->i_offset); - offset = blkoff(dp->i_fs, dp->i_offset); - if (pagedep_lookup(dp, lbn, 0, &pagedep) == 0) - goto done; - oldoffset = offset + (oldloc - base); - newoffset = offset + (newloc - base); - for (dap = LIST_FIRST(&pagedep->pd_diraddhd[DIRADDHASH(oldoffset)]); - dap; dap = LIST_NEXT(dap, da_pdlist)) { - if (dap->da_offset != oldoffset) - continue; - dap->da_offset = newoffset; - if (DIRADDHASH(newoffset) == DIRADDHASH(oldoffset)) - break; - LIST_REMOVE(dap, da_pdlist); - LIST_INSERT_HEAD(&pagedep->pd_diraddhd[DIRADDHASH(newoffset)], - dap, da_pdlist); - break; - } - if (dap == NULL) { - for (dap = LIST_FIRST(&pagedep->pd_pendinghd); - dap; dap = LIST_NEXT(dap, da_pdlist)) { - if (dap->da_offset == oldoffset) { - dap->da_offset = newoffset; - break; - } - } - } -done: - bcopy(oldloc, newloc, entrysize); - FREE_LOCK(&lk); -} - -/* - * Free a diradd dependency structure. This routine must be called - * with splbio interrupts blocked. - */ -static void -free_diradd(dap) - struct diradd *dap; -{ - struct dirrem *dirrem; - struct pagedep *pagedep; - struct inodedep *inodedep; - struct mkdir *mkdir, *nextmd; - -#ifdef DEBUG - if (lk.lkt_held == -1) - panic("free_diradd: lock not held"); -#endif - WORKLIST_REMOVE(&dap->da_list); - LIST_REMOVE(dap, da_pdlist); - if ((dap->da_state & DIRCHG) == 0) { - pagedep = dap->da_pagedep; - } else { - dirrem = dap->da_previous; - pagedep = dirrem->dm_pagedep; - dirrem->dm_dirinum = pagedep->pd_ino; - add_to_worklist(&dirrem->dm_list); - } - if (inodedep_lookup(VFSTOUFS(pagedep->pd_mnt)->um_fs, dap->da_newinum, - 0, &inodedep) != 0) - (void) free_inodedep(inodedep); - if ((dap->da_state & (MKDIR_PARENT | MKDIR_BODY)) != 0) { - for (mkdir = LIST_FIRST(&mkdirlisthd); mkdir; mkdir = nextmd) { - nextmd = LIST_NEXT(mkdir, md_mkdirs); - if (mkdir->md_diradd != dap) - continue; - dap->da_state &= ~mkdir->md_state; - WORKLIST_REMOVE(&mkdir->md_list); - LIST_REMOVE(mkdir, md_mkdirs); - WORKITEM_FREE(mkdir, D_MKDIR); - } - if ((dap->da_state & (MKDIR_PARENT | MKDIR_BODY)) != 0) - panic("free_diradd: unfound ref"); - } - WORKITEM_FREE(dap, D_DIRADD); -} - -/* - * Directory entry removal dependencies. - * - * When removing a directory entry, the entry's inode pointer must be - * zero'ed on disk before the corresponding inode's link count is decremented - * (possibly freeing the inode for re-use). This dependency is handled by - * updating the directory entry but delaying the inode count reduction until - * after the directory block has been written to disk. After this point, the - * inode count can be decremented whenever it is convenient. - */ - -/* - * This routine should be called immediately after removing - * a directory entry. The inode's link count should not be - * decremented by the calling procedure -- the soft updates - * code will do this task when it is safe. - */ -void -softdep_setup_remove(bp, dp, ip, isrmdir) - struct buf *bp; /* buffer containing directory block */ - struct inode *dp; /* inode for the directory being modified */ - struct inode *ip; /* inode for directory entry being removed */ - int isrmdir; /* indicates if doing RMDIR */ -{ - struct dirrem *dirrem, *prevdirrem; - - /* - * Allocate a new dirrem if appropriate and ACQUIRE_LOCK. - */ - dirrem = newdirrem(bp, dp, ip, isrmdir, &prevdirrem); - - /* - * If the COMPLETE flag is clear, then there were no active - * entries and we want to roll back to a zeroed entry until - * the new inode is committed to disk. If the COMPLETE flag is - * set then we have deleted an entry that never made it to - * disk. If the entry we deleted resulted from a name change, - * then the old name still resides on disk. We cannot delete - * its inode (returned to us in prevdirrem) until the zeroed - * directory entry gets to disk. The new inode has never been - * referenced on the disk, so can be deleted immediately. - */ - if ((dirrem->dm_state & COMPLETE) == 0) { - LIST_INSERT_HEAD(&dirrem->dm_pagedep->pd_dirremhd, dirrem, - dm_next); - FREE_LOCK(&lk); - } else { - u_int ipflag, dpflag; - struct vnode *vp = ITOV(ip); - struct vnode *dvp = ITOV(dp); - - if (prevdirrem != NULL) - LIST_INSERT_HEAD(&dirrem->dm_pagedep->pd_dirremhd, - prevdirrem, dm_next); - dirrem->dm_dirinum = dirrem->dm_pagedep->pd_ino; - FREE_LOCK(&lk); - ipflag = vn_setrecurse(vp); - dpflag = vn_setrecurse(dvp); - handle_workitem_remove(dirrem); - vn_restorerecurse(dvp, dpflag); - vn_restorerecurse(vp, ipflag); - } -} - -/* - * Allocate a new dirrem if appropriate and return it along with - * its associated pagedep. Called without a lock, returns with lock. - */ -static long num_dirrem; /* number of dirrem allocated */ -static struct dirrem * -newdirrem(bp, dp, ip, isrmdir, prevdirremp) - struct buf *bp; /* buffer containing directory block */ - struct inode *dp; /* inode for the directory being modified */ - struct inode *ip; /* inode for directory entry being removed */ - int isrmdir; /* indicates if doing RMDIR */ - struct dirrem **prevdirremp; /* previously referenced inode, if any */ -{ - int offset; - ufs_lbn_t lbn; - struct diradd *dap; - struct dirrem *dirrem; - struct pagedep *pagedep; - - /* - * Whiteouts have no deletion dependencies. - */ - if (ip == NULL) - panic("newdirrem: whiteout"); - /* - * If we are over our limit, try to improve the situation. - * Limiting the number of dirrem structures will also limit - * the number of freefile and freeblks structures. - */ - if (num_dirrem > max_softdeps / 2 && speedup_syncer() == 0) - (void) request_cleanup(FLUSH_REMOVE, 0); - - num_dirrem += 1; - MALLOC(dirrem, struct dirrem *, sizeof(struct dirrem), - M_DIRREM, M_WAITOK); - bzero(dirrem, sizeof(struct dirrem)); - dirrem->dm_list.wk_type = D_DIRREM; - dirrem->dm_state = isrmdir ? RMDIR : 0; - dirrem->dm_mnt = ITOV(ip)->v_mount; - dirrem->dm_oldinum = ip->i_number; - *prevdirremp = NULL; - - ACQUIRE_LOCK(&lk); - lbn = lblkno(dp->i_fs, dp->i_offset); - offset = blkoff(dp->i_fs, dp->i_offset); - if (pagedep_lookup(dp, lbn, DEPALLOC, &pagedep) == 0) - WORKLIST_INSERT(&bp->b_dep, &pagedep->pd_list); - dirrem->dm_pagedep = pagedep; - /* - * Check for a diradd dependency for the same directory entry. - * If present, then both dependencies become obsolete and can - * be de-allocated. Check for an entry on both the pd_dirraddhd - * list and the pd_pendinghd list. - */ - for (dap = LIST_FIRST(&pagedep->pd_diraddhd[DIRADDHASH(offset)]); - dap; dap = LIST_NEXT(dap, da_pdlist)) - if (dap->da_offset == offset) - break; - if (dap == NULL) { - for (dap = LIST_FIRST(&pagedep->pd_pendinghd); - dap; dap = LIST_NEXT(dap, da_pdlist)) - if (dap->da_offset == offset) - break; - if (dap == NULL) - return (dirrem); - } - /* - * Must be ATTACHED at this point. - */ - if ((dap->da_state & ATTACHED) == 0) - panic("newdirrem: not ATTACHED"); - if (dap->da_newinum != ip->i_number) - panic("newdirrem: inum %d should be %d", - ip->i_number, dap->da_newinum); - /* - * If we are deleting a changed name that never made it to disk, - * then return the dirrem describing the previous inode (which - * represents the inode currently referenced from this entry on disk). - */ - if ((dap->da_state & DIRCHG) != 0) { - *prevdirremp = dap->da_previous; - dap->da_state &= ~DIRCHG; - dap->da_pagedep = pagedep; - } - /* - * We are deleting an entry that never made it to disk. - * Mark it COMPLETE so we can delete its inode immediately. - */ - dirrem->dm_state |= COMPLETE; - free_diradd(dap); - return (dirrem); -} - -/* - * Directory entry change dependencies. - * - * Changing an existing directory entry requires that an add operation - * be completed first followed by a deletion. The semantics for the addition - * are identical to the description of adding a new entry above except - * that the rollback is to the old inode number rather than zero. Once - * the addition dependency is completed, the removal is done as described - * in the removal routine above. - */ - -/* - * This routine should be called immediately after changing - * a directory entry. The inode's link count should not be - * decremented by the calling procedure -- the soft updates - * code will perform this task when it is safe. - */ -void -softdep_setup_directory_change(bp, dp, ip, newinum, isrmdir) - struct buf *bp; /* buffer containing directory block */ - struct inode *dp; /* inode for the directory being modified */ - struct inode *ip; /* inode for directory entry being removed */ - long newinum; /* new inode number for changed entry */ - int isrmdir; /* indicates if doing RMDIR */ -{ - int offset; - struct diradd *dap = NULL; - struct dirrem *dirrem, *prevdirrem; - struct pagedep *pagedep; - struct inodedep *inodedep; - - offset = blkoff(dp->i_fs, dp->i_offset); - - /* - * Whiteouts do not need diradd dependencies. - */ - if (newinum != WINO) { - MALLOC(dap, struct diradd *, sizeof(struct diradd), - M_DIRADD, M_WAITOK); - bzero(dap, sizeof(struct diradd)); - dap->da_list.wk_type = D_DIRADD; - dap->da_state = DIRCHG | ATTACHED | DEPCOMPLETE; - dap->da_offset = offset; - dap->da_newinum = newinum; - } - - /* - * Allocate a new dirrem and ACQUIRE_LOCK. - */ - dirrem = newdirrem(bp, dp, ip, isrmdir, &prevdirrem); - pagedep = dirrem->dm_pagedep; - /* - * The possible values for isrmdir: - * 0 - non-directory file rename - * 1 - directory rename within same directory - * inum - directory rename to new directory of given inode number - * When renaming to a new directory, we are both deleting and - * creating a new directory entry, so the link count on the new - * directory should not change. Thus we do not need the followup - * dirrem which is usually done in handle_workitem_remove. We set - * the DIRCHG flag to tell handle_workitem_remove to skip the - * followup dirrem. - */ - if (isrmdir > 1) - dirrem->dm_state |= DIRCHG; - - /* - * Whiteouts have no additional dependencies, - * so just put the dirrem on the correct list. - */ - if (newinum == WINO) { - if ((dirrem->dm_state & COMPLETE) == 0) { - LIST_INSERT_HEAD(&pagedep->pd_dirremhd, dirrem, - dm_next); - } else { - dirrem->dm_dirinum = pagedep->pd_ino; - add_to_worklist(&dirrem->dm_list); - } - FREE_LOCK(&lk); - return; - } - - /* - * If the COMPLETE flag is clear, then there were no active - * entries and we want to roll back to the previous inode until - * the new inode is committed to disk. If the COMPLETE flag is - * set, then we have deleted an entry that never made it to disk. - * If the entry we deleted resulted from a name change, then the old - * inode reference still resides on disk. Any rollback that we do - * needs to be to that old inode (returned to us in prevdirrem). If - * the entry we deleted resulted from a create, then there is - * no entry on the disk, so we want to roll back to zero rather - * than the uncommitted inode. In either of the COMPLETE cases we - * want to immediately free the unwritten and unreferenced inode. - */ - if ((dirrem->dm_state & COMPLETE) == 0) { - dap->da_previous = dirrem; - } else { - if (prevdirrem != NULL) { - dap->da_previous = prevdirrem; - } else { - dap->da_state &= ~DIRCHG; - dap->da_pagedep = pagedep; - } - dirrem->dm_dirinum = pagedep->pd_ino; - add_to_worklist(&dirrem->dm_list); - } - LIST_INSERT_HEAD(&pagedep->pd_diraddhd[DIRADDHASH(offset)], dap, - da_pdlist); - /* - * Link into its inodedep. Put it on the id_bufwait list if the inode - * is not yet written. If it is written, do the post-inode write - * processing to put it on the id_pendinghd list. - */ - (void) inodedep_lookup(dp->i_fs, newinum, DEPALLOC, &inodedep); - if ((inodedep->id_state & ALLCOMPLETE) == ALLCOMPLETE) - diradd_inode_written(dap, inodedep); - else - WORKLIST_INSERT(&inodedep->id_bufwait, &dap->da_list); - FREE_LOCK(&lk); -} - -/* - * Called whenever the link count on an inode is changed. - * It creates an inode dependency so that the new reference(s) - * to the inode cannot be committed to disk until the updated - * inode has been written. - */ -void -softdep_change_linkcnt(ip) - struct inode *ip; /* the inode with the increased link count */ -{ - struct inodedep *inodedep; - - ACQUIRE_LOCK(&lk); - (void) inodedep_lookup(ip->i_fs, ip->i_number, DEPALLOC, &inodedep); - if (ip->i_ffs_nlink < ip->i_ffs_effnlink) - panic("softdep_change_linkcnt: bad delta"); - inodedep->id_nlinkdelta = ip->i_ffs_nlink - ip->i_ffs_effnlink; - FREE_LOCK(&lk); -} - -/* - * This workitem decrements the inode's link count. - * If the link count reaches zero, the file is removed. - */ -static void -handle_workitem_remove(dirrem) - struct dirrem *dirrem; -{ - struct proc *p = CURPROC; /* XXX */ - struct inodedep *inodedep; - struct vnode *vp; - struct inode *ip; - ino_t oldinum; - int error; - - if ((error = VFS_VGET(dirrem->dm_mnt, dirrem->dm_oldinum, &vp)) != 0) { - softdep_error("handle_workitem_remove: vget", error); - return; - } - ip = VTOI(vp); - ACQUIRE_LOCK(&lk); - if ((inodedep_lookup(ip->i_fs, dirrem->dm_oldinum, 0, &inodedep)) == 0) - panic("handle_workitem_remove: lost inodedep"); - /* - * Normal file deletion. - */ - if ((dirrem->dm_state & RMDIR) == 0) { - ip->i_ffs_nlink--; - ip->i_flag |= IN_CHANGE; - if (ip->i_ffs_nlink < ip->i_ffs_effnlink) - panic("handle_workitem_remove: bad file delta"); - inodedep->id_nlinkdelta = ip->i_ffs_nlink - ip->i_ffs_effnlink; - FREE_LOCK(&lk); - vput(vp); - num_dirrem -= 1; - WORKITEM_FREE(dirrem, D_DIRREM); - return; - } - /* - * Directory deletion. Decrement reference count for both the - * just deleted parent directory entry and the reference for ".". - * Next truncate the directory to length zero. When the - * truncation completes, arrange to have the reference count on - * the parent decremented to account for the loss of "..". - */ - ip->i_ffs_nlink -= 2; - ip->i_flag |= IN_CHANGE; - if (ip->i_ffs_nlink < ip->i_ffs_effnlink) - panic("handle_workitem_remove: bad dir delta"); - inodedep->id_nlinkdelta = ip->i_ffs_nlink - ip->i_ffs_effnlink; - FREE_LOCK(&lk); - if ((error = VOP_TRUNCATE(vp, (off_t)0, 0, p->p_ucred, p)) != 0) - softdep_error("handle_workitem_remove: truncate", error); - /* - * Rename a directory to a new parent. Since, we are both deleting - * and creating a new directory entry, the link count on the new - * directory should not change. Thus we skip the followup dirrem. - */ - if (dirrem->dm_state & DIRCHG) { - vput(vp); - num_dirrem -= 1; - WORKITEM_FREE(dirrem, D_DIRREM); - return; - } - /* - * If the inodedep does not exist, then the zero'ed inode has - * been written to disk. If the allocated inode has never been - * written to disk, then the on-disk inode is zero'ed. In either - * case we can remove the file immediately. - */ - ACQUIRE_LOCK(&lk); - dirrem->dm_state = 0; - oldinum = dirrem->dm_oldinum; - dirrem->dm_oldinum = dirrem->dm_dirinum; - if (inodedep_lookup(ip->i_fs, oldinum, 0, &inodedep) == 0 || - check_inode_unwritten(inodedep)) { - FREE_LOCK(&lk); - vput(vp); - handle_workitem_remove(dirrem); - return; - } - WORKLIST_INSERT(&inodedep->id_inowait, &dirrem->dm_list); - FREE_LOCK(&lk); - vput(vp); -} - -/* - * Inode de-allocation dependencies. - * - * When an inode's link count is reduced to zero, it can be de-allocated. We - * found it convenient to postpone de-allocation until after the inode is - * written to disk with its new link count (zero). At this point, all of the - * on-disk inode's block pointers are nullified and, with careful dependency - * list ordering, all dependencies related to the inode will be satisfied and - * the corresponding dependency structures de-allocated. So, if/when the - * inode is reused, there will be no mixing of old dependencies with new - * ones. This artificial dependency is set up by the block de-allocation - * procedure above (softdep_setup_freeblocks) and completed by the - * following procedure. - */ -static void -handle_workitem_freefile(freefile) - struct freefile *freefile; -{ - struct vnode vp; - struct inode tip; - struct inodedep *idp; - struct vop_vfree_args args; - int error; - -#ifdef DEBUG - ACQUIRE_LOCK(&lk); - if (inodedep_lookup(freefile->fx_fs, freefile->fx_oldinum, 0, &idp)) - panic("handle_workitem_freefile: inodedep survived"); - FREE_LOCK(&lk); -#endif - tip.i_devvp = freefile->fx_devvp; - tip.i_dev = freefile->fx_devvp->v_rdev; - tip.i_fs = freefile->fx_fs; - vp.v_data = &tip; - vp.v_mount = freefile->fx_devvp->v_specmountpoint; - tip.i_vnode = &vp; - args.a_pvp = &vp; - args.a_ino = freefile->fx_oldinum; - args.a_mode = freefile->fx_mode; - if ((error = ffs_freefile(&args)) != 0) - softdep_error("handle_workitem_freefile", error); - WORKITEM_FREE(freefile, D_FREEFILE); -} - -/* - * Disk writes. - * - * The dependency structures constructed above are most actively used when file - * system blocks are written to disk. No constraints are placed on when a - * block can be written, but unsatisfied update dependencies are made safe by - * modifying (or replacing) the source memory for the duration of the disk - * write. When the disk write completes, the memory block is again brought - * up-to-date. - * - * In-core inode structure reclamation. - * - * Because there are a finite number of "in-core" inode structures, they are - * reused regularly. By transferring all inode-related dependencies to the - * in-memory inode block and indexing them separately (via "inodedep"s), we - * can allow "in-core" inode structures to be reused at any time and avoid - * any increase in contention. - * - * Called just before entering the device driver to initiate a new disk I/O. - * The buffer must be locked, thus, no I/O completion operations can occur - * while we are manipulating its associated dependencies. - */ -static void -softdep_disk_io_initiation(bp) - struct buf *bp; /* structure describing disk write to occur */ -{ - struct worklist *wk, *nextwk; - struct indirdep *indirdep; - - /* - * We only care about write operations. There should never - * be dependencies for reads. - */ - if (bp->b_flags & B_READ) - panic("softdep_disk_io_initiation: read"); - - /* - * Do any necessary pre-I/O processing. - */ - for (wk = LIST_FIRST(&bp->b_dep); wk; wk = nextwk) { - nextwk = LIST_NEXT(wk, wk_list); - switch (wk->wk_type) { - - case D_PAGEDEP: - initiate_write_filepage(WK_PAGEDEP(wk), bp); - continue; - - case D_INODEDEP: - initiate_write_inodeblock(WK_INODEDEP(wk), bp); - continue; - - case D_INDIRDEP: - indirdep = WK_INDIRDEP(wk); - if (indirdep->ir_state & GOINGAWAY) - panic("disk_io_initiation: indirdep gone"); - /* - * If there are no remaining dependencies, this - * will be writing the real pointers, so the - * dependency can be freed. - */ - if (LIST_FIRST(&indirdep->ir_deplisthd) == NULL) { - indirdep->ir_savebp->b_flags |= B_INVAL | B_NOCACHE; - brelse(indirdep->ir_savebp); - /* inline expand WORKLIST_REMOVE(wk); */ - wk->wk_state &= ~ONWORKLIST; - LIST_REMOVE(wk, wk_list); - WORKITEM_FREE(indirdep, D_INDIRDEP); - continue; - } - /* - * Replace up-to-date version with safe version. - */ - ACQUIRE_LOCK(&lk); - indirdep->ir_state &= ~ATTACHED; - indirdep->ir_state |= UNDONE; - MALLOC(indirdep->ir_saveddata, caddr_t, bp->b_bcount, - M_INDIRDEP, M_WAITOK); - bcopy(bp->b_data, indirdep->ir_saveddata, bp->b_bcount); - bcopy(indirdep->ir_savebp->b_data, bp->b_data, - bp->b_bcount); - FREE_LOCK(&lk); - continue; - - case D_MKDIR: - case D_BMSAFEMAP: - case D_ALLOCDIRECT: - case D_ALLOCINDIR: - continue; - - default: - panic("handle_disk_io_initiation: Unexpected type %s", - TYPENAME(wk->wk_type)); - /* NOTREACHED */ - } - } -} - -/* - * Called from within the procedure above to deal with unsatisfied - * allocation dependencies in a directory. The buffer must be locked, - * thus, no I/O completion operations can occur while we are - * manipulating its associated dependencies. - */ -static void -initiate_write_filepage(pagedep, bp) - struct pagedep *pagedep; - struct buf *bp; -{ - struct diradd *dap; - struct direct *ep; - int i; -#ifdef FFS_EI - const int needswap = UFS_FSNEEDSWAP(VFSTOUFS(pagedep->pd_mnt)->um_fs); -#endif - - if (pagedep->pd_state & IOSTARTED) { - /* - * This can only happen if there is a driver that does not - * understand chaining. Here biodone will reissue the call - * to strategy for the incomplete buffers. - */ - printf("initiate_write_filepage: already started\n"); - return; - } - pagedep->pd_state |= IOSTARTED; - ACQUIRE_LOCK(&lk); - for (i = 0; i < DAHASHSZ; i++) { - for (dap = LIST_FIRST(&pagedep->pd_diraddhd[i]); dap; - dap = LIST_NEXT(dap, da_pdlist)) { - ep = (struct direct *) - ((char *)bp->b_data + dap->da_offset); - if (ufs_rw32(ep->d_ino, needswap) != dap->da_newinum) - panic("%s: dir inum %d != new %d", - "initiate_write_filepage", - ufs_rw32(ep->d_ino, needswap), - dap->da_newinum); - if (dap->da_state & DIRCHG) - ep->d_ino = - ufs_rw32(dap->da_previous->dm_oldinum, - needswap); - else - ep->d_ino = 0; - dap->da_state &= ~ATTACHED; - dap->da_state |= UNDONE; - } - } - FREE_LOCK(&lk); -} - -/* - * Called from within the procedure above to deal with unsatisfied - * allocation dependencies in an inodeblock. The buffer must be - * locked, thus, no I/O completion operations can occur while we - * are manipulating its associated dependencies. - */ -static void -initiate_write_inodeblock(inodedep, bp) - struct inodedep *inodedep; - struct buf *bp; /* The inode block */ -{ - struct allocdirect *adp, *lastadp; - struct dinode *dp; - struct fs *fs = inodedep->id_fs; - ufs_lbn_t prevlbn = -1; - int i, deplist; -#ifdef FFS_EI - const int needswap = UFS_FSNEEDSWAP(fs); -#endif - - if (inodedep->id_state & IOSTARTED) - panic("initiate_write_inodeblock: already started"); - inodedep->id_state |= IOSTARTED; - dp = (struct dinode *)bp->b_data + - ino_to_fsbo(fs, inodedep->id_ino); - /* - * If the bitmap is not yet written, then the allocated - * inode cannot be written to disk. - */ - if ((inodedep->id_state & DEPCOMPLETE) == 0) { - if (inodedep->id_savedino != NULL) - panic("initiate_write_inodeblock: already doing I/O"); - MALLOC(inodedep->id_savedino, struct dinode *, - sizeof(struct dinode), M_INODEDEP, M_WAITOK); - *inodedep->id_savedino = *dp; - bzero((caddr_t)dp, sizeof(struct dinode)); - return; - } - dp->di_size = ufs_rw64(dp->di_size, needswap); - /* - * If no dependencies, then there is nothing to roll back. - */ - inodedep->id_savedsize = dp->di_size; - if (TAILQ_FIRST(&inodedep->id_inoupdt) == NULL) - return; - /* - * Set the dependencies to busy. - */ - ACQUIRE_LOCK(&lk); - for (deplist = 0, adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp; - adp = TAILQ_NEXT(adp, ad_next)) { -#ifdef DIAGNOSTIC - if (deplist != 0 && prevlbn >= adp->ad_lbn) - panic("softdep_write_inodeblock: lbn order"); - prevlbn = adp->ad_lbn; - if (adp->ad_lbn < NDADDR && - ufs_rw32(dp->di_db[adp->ad_lbn], needswap) != - adp->ad_newblkno) - panic("%s: direct pointer #%d mismatch %d != %d", - "softdep_write_inodeblock", (int)adp->ad_lbn, - ufs_rw32(dp->di_db[adp->ad_lbn], needswap), - adp->ad_newblkno); - if (adp->ad_lbn >= NDADDR && - ufs_rw32(dp->di_ib[adp->ad_lbn - NDADDR], needswap) != - adp->ad_newblkno) - panic("%s: indirect pointer #%d mismatch %d != %d", - "softdep_write_inodeblock", - (int)(adp->ad_lbn - NDADDR), - (int)ufs_rw32(dp->di_ib[adp->ad_lbn - NDADDR], - needswap), - adp->ad_newblkno); - deplist |= 1 << adp->ad_lbn; - if ((adp->ad_state & ATTACHED) == 0) - panic("softdep_write_inodeblock: Unknown state 0x%x", - adp->ad_state); -#endif /* DIAGNOSTIC */ - adp->ad_state &= ~ATTACHED; - adp->ad_state |= UNDONE; - } - /* - * The on-disk inode cannot claim to be any larger than the last - * fragment that has been written. Otherwise, the on-disk inode - * might have fragments that were not the last block in the file - * which would corrupt the filesystem. - */ - for (lastadp = NULL, adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp; - lastadp = adp, adp = TAILQ_NEXT(adp, ad_next)) { - if (adp->ad_lbn >= NDADDR) - break; - dp->di_db[adp->ad_lbn] = ufs_rw32(adp->ad_oldblkno, needswap); - /* keep going until hitting a rollback to a frag */ - if (adp->ad_oldsize == 0 || adp->ad_oldsize == fs->fs_bsize) - continue; - dp->di_size = fs->fs_bsize * adp->ad_lbn + adp->ad_oldsize; - for (i = adp->ad_lbn + 1; i < NDADDR; i++) { -#ifdef DIAGNOSTIC - if (dp->di_db[i] != 0 && (deplist & (1 << i)) == 0) - panic("softdep_write_inodeblock: lost dep1"); -#endif /* DIAGNOSTIC */ - dp->di_db[i] = 0; - } - for (i = 0; i < NIADDR; i++) { -#ifdef DIAGNOSTIC - if (dp->di_ib[i] != 0 && - (deplist & ((1 << NDADDR) << i)) == 0) - panic("softdep_write_inodeblock: lost dep2"); -#endif /* DIAGNOSTIC */ - dp->di_ib[i] = 0; - } - dp->di_size = ufs_rw64(dp->di_size, needswap); - FREE_LOCK(&lk); - return; - } - /* - * If we have zero'ed out the last allocated block of the file, - * roll back the size to the last currently allocated block. - * We know that this last allocated block is a full-sized as - * we already checked for fragments in the loop above. - */ - if (lastadp != NULL && - dp->di_size <= (lastadp->ad_lbn + 1) * fs->fs_bsize) { - for (i = lastadp->ad_lbn; i >= 0; i--) - if (dp->di_db[i] != 0) - break; - dp->di_size = (i + 1) * fs->fs_bsize; - } - dp->di_size = ufs_rw64(dp->di_size, needswap); - /* - * The only dependencies are for indirect blocks. - * - * The file size for indirect block additions is not guaranteed. - * Such a guarantee would be non-trivial to achieve. The conventional - * synchronous write implementation also does not make this guarantee. - * Fsck should catch and fix discrepancies. Arguably, the file size - * can be over-estimated without destroying integrity when the file - * moves into the indirect blocks (i.e., is large). If we want to - * postpone fsck, we are stuck with this argument. - */ - for (; adp; adp = TAILQ_NEXT(adp, ad_next)) - dp->di_ib[adp->ad_lbn - NDADDR] = 0; - FREE_LOCK(&lk); -} - -/* - * This routine is called during the completion interrupt - * service routine for a disk write (from the procedure called - * by the device driver to inform the file system caches of - * a request completion). It should be called early in this - * procedure, before the block is made available to other - * processes or other routines are called. - */ -static void -softdep_disk_write_complete(bp) - struct buf *bp; /* describes the completed disk write */ -{ - struct worklist *wk; - struct workhead reattach; - struct newblk *newblk; - struct allocindir *aip; - struct allocdirect *adp; - struct indirdep *indirdep; - struct inodedep *inodedep; - struct bmsafemap *bmsafemap; - -#ifdef DEBUG - if (lk.lkt_held != -1) - panic("softdep_disk_write_complete: lock is held"); - lk.lkt_held = -2; -#endif - LIST_INIT(&reattach); - while ((wk = LIST_FIRST(&bp->b_dep)) != NULL) { - WORKLIST_REMOVE(wk); - switch (wk->wk_type) { - - case D_PAGEDEP: - if (handle_written_filepage(WK_PAGEDEP(wk), bp)) - WORKLIST_INSERT(&reattach, wk); - continue; - - case D_INODEDEP: - if (handle_written_inodeblock(WK_INODEDEP(wk), bp)) - WORKLIST_INSERT(&reattach, wk); - continue; - - case D_BMSAFEMAP: - bmsafemap = WK_BMSAFEMAP(wk); - while ((newblk = LIST_FIRST(&bmsafemap->sm_newblkhd))) { - newblk->nb_state |= DEPCOMPLETE; - newblk->nb_bmsafemap = NULL; - LIST_REMOVE(newblk, nb_deps); - } - while ((adp = - LIST_FIRST(&bmsafemap->sm_allocdirecthd))) { - adp->ad_state |= DEPCOMPLETE; - adp->ad_buf = NULL; - LIST_REMOVE(adp, ad_deps); - handle_allocdirect_partdone(adp); - } - while ((aip = - LIST_FIRST(&bmsafemap->sm_allocindirhd))) { - aip->ai_state |= DEPCOMPLETE; - aip->ai_buf = NULL; - LIST_REMOVE(aip, ai_deps); - handle_allocindir_partdone(aip); - } - while ((inodedep = - LIST_FIRST(&bmsafemap->sm_inodedephd)) != NULL) { - inodedep->id_state |= DEPCOMPLETE; - LIST_REMOVE(inodedep, id_deps); - inodedep->id_buf = NULL; - } - WORKITEM_FREE(bmsafemap, D_BMSAFEMAP); - continue; - - case D_MKDIR: - handle_written_mkdir(WK_MKDIR(wk), MKDIR_BODY); - continue; - - case D_ALLOCDIRECT: - adp = WK_ALLOCDIRECT(wk); - adp->ad_state |= COMPLETE; - handle_allocdirect_partdone(adp); - continue; - - case D_ALLOCINDIR: - aip = WK_ALLOCINDIR(wk); - aip->ai_state |= COMPLETE; - handle_allocindir_partdone(aip); - continue; - - case D_INDIRDEP: - indirdep = WK_INDIRDEP(wk); - if (indirdep->ir_state & GOINGAWAY) - panic("disk_write_complete: indirdep gone"); - bcopy(indirdep->ir_saveddata, bp->b_data, bp->b_bcount); - FREE(indirdep->ir_saveddata, M_INDIRDEP); - indirdep->ir_saveddata = 0; - indirdep->ir_state &= ~UNDONE; - indirdep->ir_state |= ATTACHED; - while ((aip = LIST_FIRST(&indirdep->ir_donehd)) != 0) { - handle_allocindir_partdone(aip); - if (aip == LIST_FIRST(&indirdep->ir_donehd)) - panic("disk_write_complete: not gone"); - } - WORKLIST_INSERT(&reattach, wk); - if ((bp->b_flags & B_DELWRI) == 0) - stat_indir_blk_ptrs++; - bdirty(bp); - continue; - - default: - panic("handle_disk_write_complete: Unknown type %s", - TYPENAME(wk->wk_type)); - /* NOTREACHED */ - } - } - /* - * Reattach any requests that must be redone. - */ - while ((wk = LIST_FIRST(&reattach)) != NULL) { - WORKLIST_REMOVE(wk); - WORKLIST_INSERT(&bp->b_dep, wk); - } -#ifdef DEBUG - if (lk.lkt_held != -2) - panic("softdep_disk_write_complete: lock lost"); - lk.lkt_held = -1; -#endif -} - -/* - * Called from within softdep_disk_write_complete above. Note that - * this routine is always called from interrupt level with further - * splbio interrupts blocked. - */ -static void -handle_allocdirect_partdone(adp) - struct allocdirect *adp; /* the completed allocdirect */ -{ - struct allocdirect *listadp; - struct inodedep *inodedep; - long bsize; - - if ((adp->ad_state & ALLCOMPLETE) != ALLCOMPLETE) - return; - if (adp->ad_buf != NULL) - panic("handle_allocdirect_partdone: dangling dep"); - /* - * The on-disk inode cannot claim to be any larger than the last - * fragment that has been written. Otherwise, the on-disk inode - * might have fragments that were not the last block in the file - * which would corrupt the filesystem. Thus, we cannot free any - * allocdirects after one whose ad_oldblkno claims a fragment as - * these blocks must be rolled back to zero before writing the inode. - * We check the currently active set of allocdirects in id_inoupdt. - */ - inodedep = adp->ad_inodedep; - bsize = inodedep->id_fs->fs_bsize; - for (listadp = TAILQ_FIRST(&inodedep->id_inoupdt); listadp; - listadp = TAILQ_NEXT(listadp, ad_next)) { - /* found our block */ - if (listadp == adp) - break; - /* continue if ad_oldlbn is not a fragment */ - if (listadp->ad_oldsize == 0 || - listadp->ad_oldsize == bsize) - continue; - /* hit a fragment */ - return; - } - /* - * If we have reached the end of the current list without - * finding the just finished dependency, then it must be - * on the future dependency list. Future dependencies cannot - * be freed until they are moved to the current list. - */ - if (listadp == NULL) { -#ifdef DEBUG - for (listadp = TAILQ_FIRST(&inodedep->id_newinoupdt); listadp; - listadp = TAILQ_NEXT(listadp, ad_next)) - /* found our block */ - if (listadp == adp) - break; - if (listadp == NULL) - panic("handle_allocdirect_partdone: lost dep"); -#endif /* DEBUG */ - return; - } - /* - * If we have found the just finished dependency, then free - * it along with anything that follows it that is complete. - */ - for (; adp; adp = listadp) { - listadp = TAILQ_NEXT(adp, ad_next); - if ((adp->ad_state & ALLCOMPLETE) != ALLCOMPLETE) - return; - free_allocdirect(&inodedep->id_inoupdt, adp, 1); - } -} - -/* - * Called from within softdep_disk_write_complete above. Note that - * this routine is always called from interrupt level with further - * splbio interrupts blocked. - */ -static void -handle_allocindir_partdone(aip) - struct allocindir *aip; /* the completed allocindir */ -{ - struct indirdep *indirdep; - - if ((aip->ai_state & ALLCOMPLETE) != ALLCOMPLETE) - return; - if (aip->ai_buf != NULL) - panic("handle_allocindir_partdone: dangling dependency"); - indirdep = aip->ai_indirdep; - if (indirdep->ir_state & UNDONE) { - LIST_REMOVE(aip, ai_next); - LIST_INSERT_HEAD(&indirdep->ir_donehd, aip, ai_next); - return; - } - ((ufs_daddr_t *)indirdep->ir_savebp->b_data)[aip->ai_offset] = - aip->ai_newblkno; - LIST_REMOVE(aip, ai_next); - if (aip->ai_freefrag != NULL) - add_to_worklist(&aip->ai_freefrag->ff_list); - WORKITEM_FREE(aip, D_ALLOCINDIR); -} - -/* - * Called from within softdep_disk_write_complete above to restore - * in-memory inode block contents to their most up-to-date state. Note - * that this routine is always called from interrupt level with further - * splbio interrupts blocked. - */ -static int -handle_written_inodeblock(inodedep, bp) - struct inodedep *inodedep; - struct buf *bp; /* buffer containing the inode block */ -{ - struct worklist *wk, *filefree; - struct allocdirect *adp, *nextadp; - struct dinode *dp; - int hadchanges; -#ifdef FFS_EI - const int needswap = UFS_FSNEEDSWAP(inodedep->id_fs); -#endif - - if ((inodedep->id_state & IOSTARTED) == 0) - panic("handle_written_inodeblock: not started"); - inodedep->id_state &= ~IOSTARTED; - inodedep->id_state |= COMPLETE; - dp = (struct dinode *)bp->b_data + - ino_to_fsbo(inodedep->id_fs, inodedep->id_ino); - /* - * If we had to rollback the inode allocation because of - * bitmaps being incomplete, then simply restore it. - * Keep the block dirty so that it will not be reclaimed until - * all associated dependencies have been cleared and the - * corresponding updates written to disk. - */ - if (inodedep->id_savedino != NULL) { - *dp = *inodedep->id_savedino; - FREE(inodedep->id_savedino, M_INODEDEP); - inodedep->id_savedino = NULL; - if ((bp->b_flags & B_DELWRI) == 0) - stat_inode_bitmap++; - bdirty(bp); - return (1); - } - /* - * Roll forward anything that had to be rolled back before - * the inode could be updated. - */ - hadchanges = 0; - for (adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp; adp = nextadp) { - nextadp = TAILQ_NEXT(adp, ad_next); - if (adp->ad_state & ATTACHED) - panic("handle_written_inodeblock: new entry"); - if (adp->ad_lbn < NDADDR) { - if (ufs_rw32(dp->di_db[adp->ad_lbn], needswap) != - adp->ad_oldblkno) - panic("%s: %s #%d mismatch %d != %d", - "handle_written_inodeblock", - "direct pointer", (int)adp->ad_lbn, - ufs_rw32(dp->di_db[adp->ad_lbn], needswap), - adp->ad_oldblkno); - dp->di_db[adp->ad_lbn] = - ufs_rw32(adp->ad_newblkno, needswap); - } else { - if (dp->di_ib[adp->ad_lbn - NDADDR] != 0) - panic("%s: %s #%d allocated as %d", - "handle_written_inodeblock", - "indirect pointer", - (int)(adp->ad_lbn - NDADDR), - ufs_rw32(dp->di_ib[adp->ad_lbn - NDADDR], - needswap)); - dp->di_ib[adp->ad_lbn - NDADDR] = - ufs_rw32(adp->ad_newblkno, needswap); - } - adp->ad_state &= ~UNDONE; - adp->ad_state |= ATTACHED; - hadchanges = 1; - } - if (hadchanges && (bp->b_flags & B_DELWRI) == 0) - stat_direct_blk_ptrs++; - /* - * Reset the file size to its most up-to-date value. - */ - if (inodedep->id_savedsize == -1) - panic("handle_written_inodeblock: bad size"); - if (dp->di_size != ufs_rw64(inodedep->id_savedsize, needswap)) { - dp->di_size = ufs_rw64(inodedep->id_savedsize, needswap); - hadchanges = 1; - } - inodedep->id_savedsize = -1; - /* - * If there were any rollbacks in the inode block, then it must be - * marked dirty so that its will eventually get written back in - * its correct form. - */ - if (hadchanges) { - bdirty(bp); - } - /* - * Process any allocdirects that completed during the update. - */ - if ((adp = TAILQ_FIRST(&inodedep->id_inoupdt)) != NULL) - handle_allocdirect_partdone(adp); - /* - * Process deallocations that were held pending until the - * inode had been written to disk. Freeing of the inode - * is delayed until after all blocks have been freed to - * avoid creation of new <vfsid, inum, lbn> triples - * before the old ones have been deleted. - */ - filefree = NULL; - while ((wk = LIST_FIRST(&inodedep->id_bufwait)) != NULL) { - WORKLIST_REMOVE(wk); - switch (wk->wk_type) { - - case D_FREEFILE: - /* - * We defer adding filefree to the worklist until - * all other additions have been made to ensure - * that it will be done after all the old blocks - * have been freed. - */ - if (filefree != NULL) - panic("handle_written_inodeblock: filefree"); - filefree = wk; - continue; - - case D_MKDIR: - handle_written_mkdir(WK_MKDIR(wk), MKDIR_PARENT); - continue; - - case D_DIRADD: - diradd_inode_written(WK_DIRADD(wk), inodedep); - continue; - - case D_FREEBLKS: - case D_FREEFRAG: - case D_DIRREM: - add_to_worklist(wk); - continue; - - default: - panic("handle_written_inodeblock: Unknown type %s", - TYPENAME(wk->wk_type)); - /* NOTREACHED */ - } - } - if (filefree != NULL) { - if (free_inodedep(inodedep) == 0) - panic("handle_written_inodeblock: live inodedep"); - add_to_worklist(filefree); - return (0); - } - - /* - * If no outstanding dependencies, free it. - */ - if (free_inodedep(inodedep) || TAILQ_FIRST(&inodedep->id_inoupdt) == 0) - return (0); - return (hadchanges); -} - -/* - * Process a diradd entry after its dependent inode has been written. - * This routine must be called with splbio interrupts blocked. - */ -static void -diradd_inode_written(dap, inodedep) - struct diradd *dap; - struct inodedep *inodedep; -{ - struct pagedep *pagedep; - - dap->da_state |= COMPLETE; - if ((dap->da_state & ALLCOMPLETE) == ALLCOMPLETE) { - if (dap->da_state & DIRCHG) - pagedep = dap->da_previous->dm_pagedep; - else - pagedep = dap->da_pagedep; - LIST_REMOVE(dap, da_pdlist); - LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap, da_pdlist); - } - WORKLIST_INSERT(&inodedep->id_pendinghd, &dap->da_list); -} - -/* - * Handle the completion of a mkdir dependency. - */ -static void -handle_written_mkdir(mkdir, type) - struct mkdir *mkdir; - int type; -{ - struct diradd *dap; - struct pagedep *pagedep; - - if (mkdir->md_state != type) - panic("handle_written_mkdir: bad type"); - dap = mkdir->md_diradd; - dap->da_state &= ~type; - if ((dap->da_state & (MKDIR_PARENT | MKDIR_BODY)) == 0) - dap->da_state |= DEPCOMPLETE; - if ((dap->da_state & ALLCOMPLETE) == ALLCOMPLETE) { - if (dap->da_state & DIRCHG) - pagedep = dap->da_previous->dm_pagedep; - else - pagedep = dap->da_pagedep; - LIST_REMOVE(dap, da_pdlist); - LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap, da_pdlist); - } - LIST_REMOVE(mkdir, md_mkdirs); - WORKITEM_FREE(mkdir, D_MKDIR); -} - -/* - * Called from within softdep_disk_write_complete above. - * A write operation was just completed. Removed inodes can - * now be freed and associated block pointers may be committed. - * Note that this routine is always called from interrupt level - * with further splbio interrupts blocked. - */ -static int -handle_written_filepage(pagedep, bp) - struct pagedep *pagedep; - struct buf *bp; /* buffer containing the written page */ -{ - struct dirrem *dirrem; - struct diradd *dap, *nextdap; - struct direct *ep; - int i, chgs; -#ifdef FFS_EI - const int needswap = UFS_FSNEEDSWAP(VFSTOUFS(pagedep->pd_mnt)->um_fs); -#endif - - if ((pagedep->pd_state & IOSTARTED) == 0) - panic("handle_written_filepage: not started"); - pagedep->pd_state &= ~IOSTARTED; - /* - * Process any directory removals that have been committed. - */ - while ((dirrem = LIST_FIRST(&pagedep->pd_dirremhd)) != NULL) { - LIST_REMOVE(dirrem, dm_next); - dirrem->dm_dirinum = pagedep->pd_ino; - add_to_worklist(&dirrem->dm_list); - } - /* - * Free any directory additions that have been committed. - */ - while ((dap = LIST_FIRST(&pagedep->pd_pendinghd)) != NULL) { - free_diradd(dap); - } - /* - * Uncommitted directory entries must be restored. - */ - for (chgs = 0, i = 0; i < DAHASHSZ; i++) { - for (dap = LIST_FIRST(&pagedep->pd_diraddhd[i]); dap; - dap = nextdap) { - nextdap = LIST_NEXT(dap, da_pdlist); - if (dap->da_state & ATTACHED) - panic("handle_written_filepage: attached"); - ep = (struct direct *) - ((char *)bp->b_data + dap->da_offset); - ep->d_ino = ufs_rw32(dap->da_newinum, needswap); - dap->da_state &= ~UNDONE; - dap->da_state |= ATTACHED; - chgs = 1; - /* - * If the inode referenced by the directory has - * been written out, then the dependency can be - * moved to the pending list. - */ - if ((dap->da_state & ALLCOMPLETE) == ALLCOMPLETE) { - LIST_REMOVE(dap, da_pdlist); - LIST_INSERT_HEAD(&pagedep->pd_pendinghd, dap, - da_pdlist); - } - } - } - /* - * If there were any rollbacks in the directory, then it must be - * marked dirty so that its will eventually get written back in - * its correct form. - */ - if (chgs) { - if ((bp->b_flags & B_DELWRI) == 0) - stat_dir_entry++; - bdirty(bp); - } - /* - * If no dependencies remain, the pagedep will be freed. - * Otherwise it will remain to update the page before it - * is written back to disk. - */ - if (LIST_FIRST(&pagedep->pd_pendinghd) == 0) { - for (i = 0; i < DAHASHSZ; i++) - if (LIST_FIRST(&pagedep->pd_diraddhd[i]) != NULL) - break; - if (i == DAHASHSZ) { - LIST_REMOVE(pagedep, pd_hash); - WORKITEM_FREE(pagedep, D_PAGEDEP); - return (0); - } - } - return (1); -} - -/* - * Writing back in-core inode structures. - * - * The file system only accesses an inode's contents when it occupies an - * "in-core" inode structure. These "in-core" structures are separate from - * the page frames used to cache inode blocks. Only the latter are - * transferred to/from the disk. So, when the updated contents of the - * "in-core" inode structure are copied to the corresponding in-memory inode - * block, the dependencies are also transferred. The following procedure is - * called when copying a dirty "in-core" inode to a cached inode block. - */ - -/* - * Called when an inode is loaded from disk. If the effective link count - * differed from the actual link count when it was last flushed, then we - * need to ensure that the correct effective link count is put back. - */ -void -softdep_load_inodeblock(ip) - struct inode *ip; /* the "in_core" copy of the inode */ -{ - struct inodedep *inodedep; - - /* - * Check for alternate nlink count. - */ - ip->i_ffs_effnlink = ip->i_ffs_nlink; - ACQUIRE_LOCK(&lk); - if (inodedep_lookup(ip->i_fs, ip->i_number, 0, &inodedep) == 0) { - FREE_LOCK(&lk); - return; - } - ip->i_ffs_effnlink -= inodedep->id_nlinkdelta; - FREE_LOCK(&lk); -} - -/* - * This routine is called just before the "in-core" inode - * information is to be copied to the in-memory inode block. - * Recall that an inode block contains several inodes. If - * the force flag is set, then the dependencies will be - * cleared so that the update can always be made. Note that - * the buffer is locked when this routine is called, so we - * will never be in the middle of writing the inode block - * to disk. - */ -void -softdep_update_inodeblock(ip, bp, waitfor) - struct inode *ip; /* the "in_core" copy of the inode */ - struct buf *bp; /* the buffer containing the inode block */ - int waitfor; /* nonzero => update must be allowed */ -{ - struct inodedep *inodedep; - struct worklist *wk; - int error, gotit; - - /* - * If the effective link count is not equal to the actual link - * count, then we must track the difference in an inodedep while - * the inode is (potentially) tossed out of the cache. Otherwise, - * if there is no existing inodedep, then there are no dependencies - * to track. - */ - ACQUIRE_LOCK(&lk); - if (inodedep_lookup(ip->i_fs, ip->i_number, 0, &inodedep) == 0) { - if (ip->i_ffs_effnlink != ip->i_ffs_nlink) - panic("softdep_update_inodeblock: bad link count"); - FREE_LOCK(&lk); - return; - } - if (inodedep->id_nlinkdelta != ip->i_ffs_nlink - ip->i_ffs_effnlink) - panic("softdep_update_inodeblock: bad delta"); - /* - * Changes have been initiated. Anything depending on these - * changes cannot occur until this inode has been written. - */ - inodedep->id_state &= ~COMPLETE; - if ((inodedep->id_state & ONWORKLIST) == 0) { - WORKLIST_INSERT(&bp->b_dep, &inodedep->id_list); - } - /* - * Any new dependencies associated with the incore inode must - * now be moved to the list associated with the buffer holding - * the in-memory copy of the inode. Once merged process any - * allocdirects that are completed by the merger. - */ - merge_inode_lists(inodedep); - if (TAILQ_FIRST(&inodedep->id_inoupdt) != NULL) - handle_allocdirect_partdone(TAILQ_FIRST(&inodedep->id_inoupdt)); - /* - * Now that the inode has been pushed into the buffer, the - * operations dependent on the inode being written to disk - * can be moved to the id_bufwait so that they will be - * processed when the buffer I/O completes. - */ - while ((wk = LIST_FIRST(&inodedep->id_inowait)) != NULL) { - WORKLIST_REMOVE(wk); - WORKLIST_INSERT(&inodedep->id_bufwait, wk); - } - /* - * Newly allocated inodes cannot be written until the bitmap - * that allocates them have been written (indicated by - * DEPCOMPLETE being set in id_state). If we are doing a - * forced sync (e.g., an fsync on a file), we force the bitmap - * to be written so that the update can be done. - */ - if ((inodedep->id_state & DEPCOMPLETE) != 0 || waitfor == 0) { - FREE_LOCK(&lk); - return; - } - gotit = getdirtybuf(&inodedep->id_buf, MNT_WAIT); - FREE_LOCK(&lk); - if (gotit && (error = VOP_BWRITE(inodedep->id_buf)) != 0) - softdep_error("softdep_update_inodeblock: bwrite", error); - if ((inodedep->id_state & DEPCOMPLETE) == 0) - panic("softdep_update_inodeblock: update failed"); -} - -/* - * Merge the new inode dependency list (id_newinoupdt) into the old - * inode dependency list (id_inoupdt). This routine must be called - * with splbio interrupts blocked. - */ -static void -merge_inode_lists(inodedep) - struct inodedep *inodedep; -{ - struct allocdirect *listadp, *newadp; - - newadp = TAILQ_FIRST(&inodedep->id_newinoupdt); - for (listadp = TAILQ_FIRST(&inodedep->id_inoupdt); listadp && newadp;) { - if (listadp->ad_lbn < newadp->ad_lbn) { - listadp = TAILQ_NEXT(listadp, ad_next); - continue; - } - TAILQ_REMOVE(&inodedep->id_newinoupdt, newadp, ad_next); - TAILQ_INSERT_BEFORE(listadp, newadp, ad_next); - if (listadp->ad_lbn == newadp->ad_lbn) { - allocdirect_merge(&inodedep->id_inoupdt, newadp, - listadp); - listadp = newadp; - } - newadp = TAILQ_FIRST(&inodedep->id_newinoupdt); - } - while ((newadp = TAILQ_FIRST(&inodedep->id_newinoupdt)) != NULL) { - TAILQ_REMOVE(&inodedep->id_newinoupdt, newadp, ad_next); - TAILQ_INSERT_TAIL(&inodedep->id_inoupdt, newadp, ad_next); - } -} - -/* - * If we are doing an fsync, then we must ensure that any directory - * entries for the inode have been written after the inode gets to disk. - */ -static int -softdep_fsync(vp) - struct vnode *vp; /* the "in_core" copy of the inode */ -{ - struct diradd *dap; - struct inodedep *inodedep; - struct pagedep *pagedep; - struct worklist *wk; - struct mount *mnt; - struct vnode *pvp; - struct inode *ip; - struct buf *bp; - struct fs *fs; - struct proc *p = CURPROC; /* XXX */ - int error, flushparent; - ino_t parentino; - ufs_lbn_t lbn; - - ip = VTOI(vp); - fs = ip->i_fs; - ACQUIRE_LOCK(&lk); - if (inodedep_lookup(fs, ip->i_number, 0, &inodedep) == 0) { - FREE_LOCK(&lk); - return (0); - } - if (LIST_FIRST(&inodedep->id_inowait) != NULL || - LIST_FIRST(&inodedep->id_bufwait) != NULL || - TAILQ_FIRST(&inodedep->id_inoupdt) != NULL || - TAILQ_FIRST(&inodedep->id_newinoupdt) != NULL) - panic("softdep_fsync: pending ops"); - for (error = 0, flushparent = 0; ; ) { - if ((wk = LIST_FIRST(&inodedep->id_pendinghd)) == NULL) - break; - if (wk->wk_type != D_DIRADD) - panic("softdep_fsync: Unexpected type %s", - TYPENAME(wk->wk_type)); - dap = WK_DIRADD(wk); - /* - * Flush our parent if this directory entry - * has a MKDIR_PARENT dependency. - */ - if (dap->da_state & DIRCHG) - pagedep = dap->da_previous->dm_pagedep; - else - pagedep = dap->da_pagedep; - mnt = pagedep->pd_mnt; - parentino = pagedep->pd_ino; - lbn = pagedep->pd_lbn; - if ((dap->da_state & (MKDIR_BODY | COMPLETE)) != COMPLETE) - panic("softdep_fsync: dirty"); - flushparent = dap->da_state & MKDIR_PARENT; - /* - * If we are being fsync'ed as part of vgone'ing this vnode, - * then we will not be able to release and recover the - * vnode below, so we just have to give up on writing its - * directory entry out. It will eventually be written, just - * not now, but then the user was not asking to have it - * written, so we are not breaking any promises. - */ - if (vp->v_flag & VXLOCK) - break; - /* - * We prevent deadlock by always fetching inodes from the - * root, moving down the directory tree. Thus, when fetching - * our parent directory, we must unlock ourselves before - * requesting the lock on our parent. See the comment in - * ufs_lookup for details on possible races. - */ - FREE_LOCK(&lk); - VOP_UNLOCK(vp, 0); - error = VFS_VGET(mnt, parentino, &pvp); - vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); - if (error != 0) - return (error); - if (flushparent) { -#ifdef __FreeBSD__ - error = UFS_UPDATE(pvp, 1); -#else - VTOI(pvp)->i_flag |= IN_MODIFIED; - error = VOP_UPDATE(pvp, NULL, NULL, UPDATE_WAIT); -#endif - if (error) { - vput(pvp); - return (error); - } - } - /* - * Flush directory page containing the inode's name. - */ - error = bread(pvp, lbn, blksize(fs, VTOI(pvp), lbn), p->p_ucred, - &bp); - if (error == 0) - error = VOP_BWRITE(bp); - vput(pvp); - if (error != 0) - return (error); - ACQUIRE_LOCK(&lk); - if (inodedep_lookup(fs, ip->i_number, 0, &inodedep) == 0) - break; - } - FREE_LOCK(&lk); - return (0); -} - -/* - * Flush all the dirty bitmaps associated with the block device - * before flushing the rest of the dirty blocks so as to reduce - * the number of dependencies that will have to be rolled back. - */ -void -softdep_fsync_mountdev(vp) - struct vnode *vp; -{ - struct buf *bp, *nbp; - struct worklist *wk; - - if (vp->v_type != VBLK) - panic("softdep_fsync_mountdev: vnode not VBLK"); - ACQUIRE_LOCK(&lk); - for (bp = vp->v_dirtyblkhd.lh_first; bp; bp = nbp) { - nbp = bp->b_vnbufs.le_next; - /* - * If it is already scheduled, skip to the next buffer. - */ - if (bp->b_flags & B_BUSY) - continue; - if ((bp->b_flags & B_DELWRI) == 0) - panic("softdep_fsync_mountdev: not dirty"); - /* - * We are only interested in bitmaps with outstanding - * dependencies. - */ - if ((wk = LIST_FIRST(&bp->b_dep)) == NULL || - wk->wk_type != D_BMSAFEMAP) - continue; - bremfree(bp); - bp->b_flags |= B_BUSY; - FREE_LOCK(&lk); - (void) bawrite(bp); - ACQUIRE_LOCK(&lk); - /* - * Since we may have slept during the I/O, we need - * to start from a known point. - */ - nbp = vp->v_dirtyblkhd.lh_first; - } - drain_output(vp, 1); - FREE_LOCK(&lk); -} - -/* - * This routine is called when we are trying to synchronously flush a - * file. This routine must eliminate any filesystem metadata dependencies - * so that the syncing routine can succeed by pushing the dirty blocks - * associated with the file. If any I/O errors occur, they are returned. - */ -int -softdep_sync_metadata(v) - void *v; -{ - struct vop_fsync_args /* { - struct vnode *a_vp; - struct ucred *a_cred; - int a_waitfor; - struct proc *a_p; - } */ *ap = v; - struct vnode *vp = ap->a_vp; - struct inodedep *inodedep; - struct pagedep *pagedep; - struct allocdirect *adp; - struct allocindir *aip; - struct buf *bp, *nbp; - struct worklist *wk; - int i, error, waitfor; - - /* - * Check whether this vnode is involved in a filesystem - * that is doing soft dependency processing. - */ - if (vp->v_type != VBLK) { - if (!DOINGSOFTDEP(vp)) - return (0); - } else - if (vp->v_specmountpoint == NULL || - (vp->v_specmountpoint->mnt_flag & MNT_SOFTDEP) == 0) - return (0); - /* - * Ensure that any direct block dependencies have been cleared. - */ - ACQUIRE_LOCK(&lk); - error = flush_inodedep_deps(VTOI(vp)->i_fs, VTOI(vp)->i_number); - if (error) { - FREE_LOCK(&lk); - return (error); - } - /* - * For most files, the only metadata dependencies are the - * cylinder group maps that allocate their inode or blocks. - * The block allocation dependencies can be found by traversing - * the dependency lists for any buffers that remain on their - * dirty buffer list. The inode allocation dependency will - * be resolved when the inode is updated with MNT_WAIT. - * This work is done in two passes. The first pass grabs most - * of the buffers and begins asynchronously writing them. The - * only way to wait for these asynchronous writes is to sleep - * on the filesystem vnode which may stay busy for a long time - * if the filesystem is active. So, instead, we make a second - * pass over the dependencies blocking on each write. In the - * usual case we will be blocking against a write that we - * initiated, so when it is done the dependency will have been - * resolved. Thus the second pass is expected to end quickly. - */ - waitfor = MNT_NOWAIT; -top: - if (getdirtybuf(&vp->v_dirtyblkhd.lh_first, MNT_WAIT) == 0) - goto clean; - bp = vp->v_dirtyblkhd.lh_first; -loop: - /* - * As we hold the buffer locked, none of its dependencies - * will disappear. - */ - for (wk = LIST_FIRST(&bp->b_dep); wk; - wk = LIST_NEXT(wk, wk_list)) { - switch (wk->wk_type) { - - case D_ALLOCDIRECT: - adp = WK_ALLOCDIRECT(wk); - if (adp->ad_state & DEPCOMPLETE) - break; - nbp = adp->ad_buf; - if (getdirtybuf(&nbp, waitfor) == 0) - break; - FREE_LOCK(&lk); - if (waitfor == MNT_NOWAIT) { - bawrite(nbp); - } else if ((error = VOP_BWRITE(nbp)) != 0) { - bawrite(bp); - return (error); - } - ACQUIRE_LOCK(&lk); - break; - - case D_ALLOCINDIR: - aip = WK_ALLOCINDIR(wk); - if (aip->ai_state & DEPCOMPLETE) - break; - nbp = aip->ai_buf; - if (getdirtybuf(&nbp, waitfor) == 0) - break; - FREE_LOCK(&lk); - if (waitfor == MNT_NOWAIT) { - bawrite(nbp); - } else if ((error = VOP_BWRITE(nbp)) != 0) { - bawrite(bp); - return (error); - } - ACQUIRE_LOCK(&lk); - break; - - case D_INDIRDEP: - restart: - for (aip = LIST_FIRST(&WK_INDIRDEP(wk)->ir_deplisthd); - aip; aip = LIST_NEXT(aip, ai_next)) { - if (aip->ai_state & DEPCOMPLETE) - continue; - nbp = aip->ai_buf; - if (getdirtybuf(&nbp, MNT_WAIT) == 0) - goto restart; - FREE_LOCK(&lk); - if ((error = VOP_BWRITE(nbp)) != 0) { - bawrite(bp); - return (error); - } - ACQUIRE_LOCK(&lk); - goto restart; - } - break; - - case D_INODEDEP: - if ((error = flush_inodedep_deps(WK_INODEDEP(wk)->id_fs, - WK_INODEDEP(wk)->id_ino)) != 0) { - FREE_LOCK(&lk); - bawrite(bp); - return (error); - } - break; - - case D_PAGEDEP: - /* - * We are trying to sync a directory that may - * have dependencies on both its own metadata - * and/or dependencies on the inodes of any - * recently allocated files. We walk its diradd - * lists pushing out the associated inode. - */ - pagedep = WK_PAGEDEP(wk); - for (i = 0; i < DAHASHSZ; i++) { - if (LIST_FIRST(&pagedep->pd_diraddhd[i]) == 0) - continue; - error = flush_pagedep_deps(vp, pagedep->pd_mnt, - &pagedep->pd_diraddhd[i]); - if (error) { - FREE_LOCK(&lk); - bawrite(bp); - return (error); - } - } - break; - - case D_MKDIR: - /* - * This case should never happen if the vnode has - * been properly sync'ed. However, if this function - * is used at a place where the vnode has not yet - * been sync'ed, this dependency can show up. So, - * rather than panic, just flush it. - */ - nbp = WK_MKDIR(wk)->md_buf; - if (getdirtybuf(&nbp, waitfor) == 0) - break; - FREE_LOCK(&lk); - if (waitfor == MNT_NOWAIT) { - bawrite(nbp); - } else if ((error = VOP_BWRITE(nbp)) != 0) { - bawrite(bp); - return (error); - } - ACQUIRE_LOCK(&lk); - break; - - case D_BMSAFEMAP: - /* - * This case should never happen if the vnode has - * been properly sync'ed. However, if this function - * is used at a place where the vnode has not yet - * been sync'ed, this dependency can show up. So, - * rather than panic, just flush it. - */ - nbp = WK_BMSAFEMAP(wk)->sm_buf; - if (getdirtybuf(&nbp, waitfor) == 0) - break; - FREE_LOCK(&lk); - if (waitfor == MNT_NOWAIT) { - bawrite(nbp); - } else if ((error = VOP_BWRITE(nbp)) != 0) { - bawrite(bp); - return (error); - } - ACQUIRE_LOCK(&lk); - break; - - default: - panic("softdep_sync_metadata: Unknown type %s", - TYPENAME(wk->wk_type)); - /* NOTREACHED */ - } - } - (void) getdirtybuf(&bp->b_vnbufs.le_next, MNT_WAIT); - nbp = bp->b_vnbufs.le_next; - FREE_LOCK(&lk); - bawrite(bp); - ACQUIRE_LOCK(&lk); - if (nbp != NULL) { - bp = nbp; - goto loop; - } - /* - * We must wait for any I/O in progress to finish so that - * all potential buffers on the dirty list will be visible. - * Once they are all there, proceed with the second pass - * which will wait for the I/O as per above. - */ - drain_output(vp, 1); - /* - * The brief unlock is to allow any pent up dependency - * processing to be done. - */ - if (waitfor == MNT_NOWAIT) { - waitfor = MNT_WAIT; - FREE_LOCK(&lk); - ACQUIRE_LOCK(&lk); - goto top; - } - - /* - * If we have managed to get rid of all the dirty buffers, - * then we are done. For certain directories and block - * devices, we may need to do further work. - */ - if (vp->v_dirtyblkhd.lh_first != NULL) { - FREE_LOCK(&lk); - /* - * If we are trying to sync a block device, some of its buffers - * may contain metadata that cannot be written until the - * contents of some partially written files have been written - * to disk. The only easy way to accomplish this is to sync the - * entire filesystem (luckily this happens rarely). - */ - if (vp->v_type == VBLK && vp->v_specmountpoint && - !VOP_ISLOCKED(vp) && - (error = VFS_SYNC(vp->v_specmountpoint, MNT_WAIT, - ap->a_cred, ap->a_p)) != 0) - return (error); - ACQUIRE_LOCK(&lk); - } - -clean: - /* - * If there is still an inodedep, we know that the inode has pending - * modifications, and we must force it to be flushed to disk. We do - * this by explicitly setting IN_MODIFIED so that ffs_update() will - * see it. - */ - if (inodedep_lookup(VTOI(vp)->i_fs, VTOI(vp)->i_number, 0, &inodedep)) - VTOI(vp)->i_flag |= IN_MODIFIED; - FREE_LOCK(&lk); - return (0); -} - -/* - * Flush the dependencies associated with an inodedep. - * Called with splbio blocked. - */ -static int -flush_inodedep_deps(fs, ino) - struct fs *fs; - ino_t ino; -{ - struct inodedep *inodedep; - struct allocdirect *adp; - int error, waitfor; - struct buf *bp; - - /* - * This work is done in two passes. The first pass grabs most - * of the buffers and begins asynchronously writing them. The - * only way to wait for these asynchronous writes is to sleep - * on the filesystem vnode which may stay busy for a long time - * if the filesystem is active. So, instead, we make a second - * pass over the dependencies blocking on each write. In the - * usual case we will be blocking against a write that we - * initiated, so when it is done the dependency will have been - * resolved. Thus the second pass is expected to end quickly. - * We give a brief window at the top of the loop to allow - * any pending I/O to complete. - */ - for (waitfor = MNT_NOWAIT; ; ) { - FREE_LOCK(&lk); - ACQUIRE_LOCK(&lk); - if (inodedep_lookup(fs, ino, 0, &inodedep) == 0) - return (0); - for (adp = TAILQ_FIRST(&inodedep->id_inoupdt); adp; - adp = TAILQ_NEXT(adp, ad_next)) { - if (adp->ad_state & DEPCOMPLETE) - continue; - bp = adp->ad_buf; - if (getdirtybuf(&bp, waitfor) == 0) { - if (waitfor == MNT_NOWAIT) - continue; - break; - } - FREE_LOCK(&lk); - if (waitfor == MNT_NOWAIT) { - bawrite(bp); - } else if ((error = VOP_BWRITE(bp)) != 0) { - ACQUIRE_LOCK(&lk); - return (error); - } - ACQUIRE_LOCK(&lk); - break; - } - if (adp != NULL) - continue; - for (adp = TAILQ_FIRST(&inodedep->id_newinoupdt); adp; - adp = TAILQ_NEXT(adp, ad_next)) { - if (adp->ad_state & DEPCOMPLETE) - continue; - bp = adp->ad_buf; - if (getdirtybuf(&bp, waitfor) == 0) { - if (waitfor == MNT_NOWAIT) - continue; - break; - } - FREE_LOCK(&lk); - if (waitfor == MNT_NOWAIT) { - bawrite(bp); - } else if ((error = VOP_BWRITE(bp)) != 0) { - ACQUIRE_LOCK(&lk); - return (error); - } - ACQUIRE_LOCK(&lk); - break; - } - if (adp != NULL) - continue; - /* - * If pass2, we are done, otherwise do pass 2. - */ - if (waitfor == MNT_WAIT) - break; - waitfor = MNT_WAIT; - } - /* - * Try freeing inodedep in case all dependencies have been removed. - */ - if (inodedep_lookup(fs, ino, 0, &inodedep) != 0) - (void) free_inodedep(inodedep); - return (0); -} - -/* - * Eliminate a pagedep dependency by flushing out all its diradd dependencies. - * Called with splbio blocked. - */ -static int -flush_pagedep_deps(pvp, mp, diraddhdp) - struct vnode *pvp; - struct mount *mp; - struct diraddhd *diraddhdp; -{ - struct proc *p = CURPROC; /* XXX */ - struct inodedep *inodedep; - struct ufsmount *ump; - struct diradd *dap; - struct vnode *vp; - int gotit, error = 0; - struct buf *bp; - ino_t inum; - - ump = VFSTOUFS(mp); - while ((dap = LIST_FIRST(diraddhdp)) != NULL) { - /* - * Flush ourselves if this directory entry - * has a MKDIR_PARENT dependency. - */ - if (dap->da_state & MKDIR_PARENT) { - FREE_LOCK(&lk); -#ifdef __FreeBSD__ - error = UFS_UPDATE(pvp, 1); -#else - VTOI(pvp)->i_flag |= IN_MODIFIED; - error = VOP_UPDATE(pvp, NULL, NULL, UPDATE_WAIT); -#endif - if (error) - break; - ACQUIRE_LOCK(&lk); - /* - * If that cleared dependencies, go on to next. - */ - if (dap != LIST_FIRST(diraddhdp)) - continue; - if (dap->da_state & MKDIR_PARENT) - panic("flush_pagedep_deps: MKDIR_PARENT"); - } - /* - * A newly allocated directory must have its "." and - * ".." entries written out before its name can be - * committed in its parent. We do not want or need - * the full semantics of a synchronous VOP_FSYNC as - * that may end up here again, once for each directory - * level in the filesystem. Instead, we push the blocks - * and wait for them to clear. We have to fsync twice - * because the first call may choose to defer blocks - * that still have dependencies, but deferral will - * happen at most once. - */ - inum = dap->da_newinum; - if (dap->da_state & MKDIR_BODY) { - FREE_LOCK(&lk); - if ((error = VFS_VGET(mp, inum, &vp)) != 0) - break; - if ((error = VOP_FSYNC(vp, p->p_ucred, 0, p)) || - (error = VOP_FSYNC(vp, p->p_ucred, 0, p))) { - vput(vp); - break; - } - drain_output(vp, 0); - vput(vp); - ACQUIRE_LOCK(&lk); - /* - * If that cleared dependencies, go on to next. - */ - if (dap != LIST_FIRST(diraddhdp)) - continue; - if (dap->da_state & MKDIR_BODY) - panic("flush_pagedep_deps: MKDIR_BODY"); - } - /* - * Flush the inode on which the directory entry depends. - * Having accounted for MKDIR_PARENT and MKDIR_BODY above, - * the only remaining dependency is that the updated inode - * count must get pushed to disk. The inode has already - * been pushed into its inode buffer (via VOP_UPDATE) at - * the time of the reference count change. So we need only - * locate that buffer, ensure that there will be no rollback - * caused by a bitmap dependency, then write the inode buffer. - */ - if (inodedep_lookup(ump->um_fs, inum, 0, &inodedep) == 0) - panic("flush_pagedep_deps: lost inode"); - /* - * If the inode still has bitmap dependencies, - * push them to disk. - */ - if ((inodedep->id_state & DEPCOMPLETE) == 0) { - gotit = getdirtybuf(&inodedep->id_buf, MNT_WAIT); - FREE_LOCK(&lk); - if (gotit && - (error = VOP_BWRITE(inodedep->id_buf)) != 0) - break; - ACQUIRE_LOCK(&lk); - if (dap != LIST_FIRST(diraddhdp)) - continue; - } - /* - * If the inode is still sitting in a buffer waiting - * to be written, push it to disk. - */ - FREE_LOCK(&lk); - if ((error = bread(ump->um_devvp, - fsbtodb(ump->um_fs, ino_to_fsba(ump->um_fs, inum)), - (int)ump->um_fs->fs_bsize, NOCRED, &bp)) != 0) - break; - if ((error = VOP_BWRITE(bp)) != 0) - break; - ACQUIRE_LOCK(&lk); - /* - * If we have failed to get rid of all the dependencies - * then something is seriously wrong. - */ - if (dap == LIST_FIRST(diraddhdp)) - panic("flush_pagedep_deps: flush failed"); - } - if (error) - ACQUIRE_LOCK(&lk); - return (error); -} - -/* - * A large burst of file addition or deletion activity can drive the - * memory load excessively high. Therefore we deliberately slow things - * down and speed up the I/O processing if we find ourselves with too - * many dependencies in progress. - */ -static int -request_cleanup(resource, islocked) - int resource; - int islocked; -{ - struct proc *p = CURPROC; - int s; - - /* - * We never hold up the filesystem syncer process. - */ - if (p == filesys_syncer) - return (0); - /* - * If we are resource constrained on inode dependencies, try - * flushing some dirty inodes. Otherwise, we are constrained - * by file deletions, so try accelerating flushes of directories - * with removal dependencies. We would like to do the cleanup - * here, but we probably hold an inode locked at this point and - * that might deadlock against one that we try to clean. So, - * the best that we can do is request the syncer daemon to do - * the cleanup for us. - */ - switch (resource) { - - case FLUSH_INODES: - stat_ino_limit_push += 1; - req_clear_inodedeps = 1; - break; - - case FLUSH_REMOVE: - stat_blk_limit_push += 1; - req_clear_remove = 1; - break; - - default: - panic("request_cleanup: unknown type"); - } - /* - * Hopefully the syncer daemon will catch up and awaken us. - * We wait at most tickdelay before proceeding in any case. - */ - if (islocked == 0) - ACQUIRE_LOCK(&lk); - if (proc_waiting++ == 0) - callout_reset(&pause_timer_ch, - tickdelay > 2 ? tickdelay : 2, pause_timer, NULL); - s = FREE_LOCK_INTERLOCKED(&lk); - (void) tsleep((caddr_t)&proc_waiting, PPAUSE, "softupdate", 0); - ACQUIRE_LOCK_INTERLOCKED(&lk, s); - if (--proc_waiting) - callout_reset(&pause_timer_ch, - tickdelay > 2 ? tickdelay : 2, pause_timer, NULL); - else { - callout_stop(&pause_timer_ch); -#if 0 - switch (resource) { - - case FLUSH_INODES: - stat_ino_limit_hit += 1; - break; - - case FLUSH_REMOVE: - stat_blk_limit_hit += 1; - break; - } -#endif - } - if (islocked == 0) - FREE_LOCK(&lk); - return (1); -} - -/* - * Awaken processes pausing in request_cleanup and clear proc_waiting - * to indicate that there is no longer a timer running. - */ -void -pause_timer(arg) - void *arg; -{ - - /* XXX was wakeup_one(), but makes no difference in uniprocessor */ - wakeup(&proc_waiting); -} - -/* - * Flush out a directory with at least one removal dependency in an effort to - * reduce the number of dirrem, freefile and freeblks dependency structures. - */ -static void -clear_remove(p) - struct proc *p; -{ - struct pagedep_hashhead *pagedephd; - struct pagedep *pagedep; - static int next = 0; - struct mount *mp; - struct vnode *vp; - int error, cnt; - ino_t ino; - - ACQUIRE_LOCK(&lk); - for (cnt = 0; cnt < pagedep_hash; cnt++) { - pagedephd = &pagedep_hashtbl[next++]; - if (next >= pagedep_hash) - next = 0; - for (pagedep = LIST_FIRST(pagedephd); pagedep; - pagedep = LIST_NEXT(pagedep, pd_hash)) { - if (LIST_FIRST(&pagedep->pd_dirremhd) == NULL) - continue; - mp = pagedep->pd_mnt; - ino = pagedep->pd_ino; - FREE_LOCK(&lk); - if ((error = VFS_VGET(mp, ino, &vp)) != 0) { - softdep_error("clear_remove: vget", error); - return; - } - if ((error = VOP_FSYNC(vp, p->p_ucred, 0, p))) - softdep_error("clear_remove: fsync", error); - drain_output(vp, 0); - vput(vp); - return; - } - } - FREE_LOCK(&lk); -} - -/* - * Clear out a block of dirty inodes in an effort to reduce - * the number of inodedep dependency structures. - */ -static void -clear_inodedeps(p) - struct proc *p; -{ - struct inodedep_hashhead *inodedephd; - struct inodedep *inodedep; - static int next = 0; - struct mount *mp; - struct vnode *vp; - struct fs *fs; - int error, cnt; - ino_t firstino, lastino, ino; - - ACQUIRE_LOCK(&lk); - /* - * Pick a random inode dependency to be cleared. - * We will then gather up all the inodes in its block - * that have dependencies and flush them out. - */ - for (cnt = 0; cnt < inodedep_hash; cnt++) { - inodedephd = &inodedep_hashtbl[next++]; - if (next >= inodedep_hash) - next = 0; - if ((inodedep = LIST_FIRST(inodedephd)) != NULL) - break; - } - /* - * Ugly code to find mount point given pointer to superblock. - */ - fs = inodedep->id_fs; - for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist; - mp = CIRCLEQ_NEXT(mp, mnt_list)) - if ((mp->mnt_flag & MNT_SOFTDEP) && fs == VFSTOUFS(mp)->um_fs) - break; - /* - * Find the last inode in the block with dependencies. - */ - firstino = inodedep->id_ino & ~(INOPB(fs) - 1); - for (lastino = firstino + INOPB(fs) - 1; lastino > firstino; lastino--) - if (inodedep_lookup(fs, lastino, 0, &inodedep) != 0) - break; - /* - * Asynchronously push all but the last inode with dependencies. - * Synchronously push the last inode with dependencies to ensure - * that the inode block gets written to free up the inodedeps. - */ - for (ino = firstino; ino <= lastino; ino++) { - if (inodedep_lookup(fs, ino, 0, &inodedep) == 0) - continue; - FREE_LOCK(&lk); - if ((error = VFS_VGET(mp, ino, &vp)) != 0) { - softdep_error("clear_inodedeps: vget", error); - return; - } - if (ino == lastino) { - if ((error = VOP_FSYNC(vp, p->p_ucred, FSYNC_WAIT, p))) - softdep_error("clear_inodedeps: fsync1", error); - } else { - if ((error = VOP_FSYNC(vp, p->p_ucred, 0, p))) - softdep_error("clear_inodedeps: fsync2", error); - drain_output(vp, 0); - } - vput(vp); - ACQUIRE_LOCK(&lk); - } - FREE_LOCK(&lk); -} - -/* - * Function to determine if the buffer has outstanding dependencies - * that will cause a roll-back if the buffer is written. If wantcount - * is set, return number of dependencies, otherwise just yes or no. - */ -static int -softdep_count_dependencies(bp, wantcount) - struct buf *bp; - int wantcount; -{ - struct worklist *wk; - struct inodedep *inodedep; - struct indirdep *indirdep; - struct allocindir *aip; - struct pagedep *pagedep; - struct diradd *dap; - int i, retval; - - retval = 0; - ACQUIRE_LOCK(&lk); - for (wk = LIST_FIRST(&bp->b_dep); wk; wk = LIST_NEXT(wk, wk_list)) { - switch (wk->wk_type) { - - case D_INODEDEP: - inodedep = WK_INODEDEP(wk); - if ((inodedep->id_state & DEPCOMPLETE) == 0) { - /* bitmap allocation dependency */ - retval += 1; - if (!wantcount) - goto out; - } - if (TAILQ_FIRST(&inodedep->id_inoupdt)) { - /* direct block pointer dependency */ - retval += 1; - if (!wantcount) - goto out; - } - continue; - - case D_INDIRDEP: - indirdep = WK_INDIRDEP(wk); - for (aip = LIST_FIRST(&indirdep->ir_deplisthd); - aip; aip = LIST_NEXT(aip, ai_next)) { - /* indirect block pointer dependency */ - retval += 1; - if (!wantcount) - goto out; - } - continue; - - case D_PAGEDEP: - pagedep = WK_PAGEDEP(wk); - for (i = 0; i < DAHASHSZ; i++) { - for (dap = LIST_FIRST(&pagedep->pd_diraddhd[i]); - dap; dap = LIST_NEXT(dap, da_pdlist)) { - /* directory entry dependency */ - retval += 1; - if (!wantcount) - goto out; - } - } - continue; - - case D_BMSAFEMAP: - case D_ALLOCDIRECT: - case D_ALLOCINDIR: - case D_MKDIR: - /* never a dependency on these blocks */ - continue; - - default: - panic("softdep_check_for_rollback: Unexpected type %s", - TYPENAME(wk->wk_type)); - /* NOTREACHED */ - } - } -out: - FREE_LOCK(&lk); - return retval; -} - -/* - * Acquire exclusive access to a buffer. - * Must be called with splbio blocked. - * Return 1 if buffer was acquired. - */ -static int -getdirtybuf(bpp, waitfor) - struct buf **bpp; - int waitfor; -{ - struct buf *bp; - - for (;;) { - int s; - - if ((bp = *bpp) == NULL) - return (0); - if ((bp->b_flags & B_BUSY) == 0) - break; - if (waitfor != MNT_WAIT) - return (0); - bp->b_flags |= B_WANTED; - s = FREE_LOCK_INTERLOCKED(&lk); - (void) tsleep(bp, PRIBIO + 1, "softgetdbuf", 0); - ACQUIRE_LOCK_INTERLOCKED(&lk, s); - } - if ((bp->b_flags & B_DELWRI) == 0) { - return (0); - } -#if 1 - bp->b_flags |= B_BUSY; - bremfree(bp); -#else - bp->b_flags |= B_BUSY | B_VFLUSH; -#endif - return (1); -} - -/* - * Wait for pending output on a vnode to complete. - * Must be called with vnode locked. - */ -static void -drain_output(vp, islocked) - struct vnode *vp; - int islocked; -{ - - if (!islocked) - ACQUIRE_LOCK(&lk); - while (vp->v_numoutput) { - int s; - - vp->v_flag |= VBWAIT; - s = FREE_LOCK_INTERLOCKED(&lk); - tsleep((caddr_t)&vp->v_numoutput, PRIBIO + 1, "drainvp", 0); - ACQUIRE_LOCK_INTERLOCKED(&lk, s); - } - if (!islocked) - FREE_LOCK(&lk); -} - -/* - * Called whenever a buffer that is being invalidated or reallocated - * contains dependencies. This should only happen if an I/O error has - * occurred. The routine is called with the buffer locked. - */ -static void -softdep_deallocate_dependencies(bp) - struct buf *bp; -{ - - if ((bp->b_flags & B_ERROR) == 0) - panic("softdep_deallocate_dependencies: dangling deps"); - softdep_error(bp->b_vp->v_mount->mnt_stat.f_mntonname, bp->b_error); - panic("softdep_deallocate_dependencies: unrecovered I/O error"); -} - -/* - * Function to handle asynchronous write errors in the filesystem. - */ -void -softdep_error(func, error) - char *func; - int error; -{ - - /* XXX should do something better! */ - printf("%s: got error %d while accessing filesystem\n", func, error); -} |
