version 1.1, 2005/01/23 19:37:05 |
version 1.13.2.4, 2007/07/15 13:28:20 |
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* This implements a hash-based lookup scheme for UFS directories. |
* This implements a hash-based lookup scheme for UFS directories. |
*/ |
*/ |
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#ifdef UFS_DIRHASH |
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#include <sys/param.h> |
#include <sys/param.h> |
#include <sys/systm.h> |
#include <sys/systm.h> |
#include <sys/kernel.h> |
#include <sys/kernel.h> |
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#include <sys/pool.h> |
#include <sys/pool.h> |
#include <sys/sysctl.h> |
#include <sys/sysctl.h> |
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#include <ufs/ufs/quota.h> |
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#include <ufs/ufs/inode.h> |
#include <ufs/ufs/inode.h> |
#include <ufs/ufs/dir.h> |
#include <ufs/ufs/dir.h> |
#include <ufs/ufs/dirhash.h> |
#include <ufs/ufs/dirhash.h> |
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#define OFSFMT(ip) ((ip)->i_ump->um_maxsymlinklen <= 0) |
#define OFSFMT(ip) ((ip)->i_ump->um_maxsymlinklen <= 0) |
#define BLKFREE2IDX(n) ((n) > DH_NFSTATS ? DH_NFSTATS : (n)) |
#define BLKFREE2IDX(n) ((n) > DH_NFSTATS ? DH_NFSTATS : (n)) |
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static MALLOC_DEFINE(M_DIRHASH, "UFS dirhash", "UFS directory hash tables"); |
static MALLOC_JUSTDEFINE(M_DIRHASH, "UFS dirhash", "UFS directory hash tables"); |
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static int ufs_dirhashminblks = 5; |
static int ufs_dirhashminblks = 5; |
static int ufs_dirhashmaxmem = 2 * 1024 * 1024; |
static int ufs_dirhashmaxmem = 2 * 1024 * 1024; |
static int ufs_dirhashmem; |
static int ufs_dirhashmem; |
static int ufs_dirhashcheck = 0; |
static int ufs_dirhashcheck = 0; |
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static int ufsdirhash_hash(struct dirhash *dh, const char *name, int namelen); |
static int ufsdirhash_hash(struct dirhash *dh, const char *name, int namelen); |
Line 76 static doff_t ufsdirhash_getprev(struct |
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Line 73 static doff_t ufsdirhash_getprev(struct |
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int dirblksiz); |
int dirblksiz); |
static int ufsdirhash_recycle(int wanted); |
static int ufsdirhash_recycle(int wanted); |
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POOL_INIT(ufsdirhash_pool, DH_NBLKOFF * sizeof(daddr_t), 0, 0, 0, "ufsdirhash", |
#define DIRHASHLIST_LOCK() mutex_enter(&ufsdirhash_lock) |
&pool_allocator_nointr); |
#define DIRHASHLIST_UNLOCK() mutex_exit(&ufsdirhash_lock) |
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#define DIRHASH_LOCK(dh) mutex_enter(&(dh)->dh_lock) |
#define DIRHASHLIST_LOCK() do { } while (0) |
#define DIRHASH_UNLOCK(dh) mutex_exit(&(dh)->dh_lock) |
#define DIRHASHLIST_UNLOCK() do { } while (0) |
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#define DIRHASH_LOCK(dh) do { } while (0) |
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#define DIRHASH_UNLOCK(dh) do { } while (0) |
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#define DIRHASH_BLKALLOC_WAITOK() pool_get(&ufsdirhash_pool, PR_WAITOK) |
#define DIRHASH_BLKALLOC_WAITOK() pool_get(&ufsdirhash_pool, PR_WAITOK) |
#define DIRHASH_BLKFREE(ptr) pool_put(&ufsdirhash_pool, ptr) |
#define DIRHASH_BLKFREE(ptr) pool_put(&ufsdirhash_pool, ptr) |
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/* Dirhash list; recently-used entries are near the tail. */ |
/* Dirhash list; recently-used entries are near the tail. */ |
static TAILQ_HEAD(, dirhash) ufsdirhash_list; |
static TAILQ_HEAD(, dirhash) ufsdirhash_list; |
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/* Protects: ufsdirhash_list, `dh_list' field, ufs_dirhashmem. */ |
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static kmutex_t ufsdirhash_lock; |
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/* |
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* Locking order: |
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* ufsdirhash_lock |
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* dh_lock |
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* |
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* The dh_lock mutex should be acquired either via the inode lock, or via |
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* ufsdirhash_lock. Only the owner of the inode may free the associated |
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* dirhash, but anything can steal its memory and set dh_hash to NULL. |
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*/ |
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/* |
/* |
* Attempt to build up a hash table for the directory contents in |
* Attempt to build up a hash table for the directory contents in |
* inode 'ip'. Returns 0 on success, or -1 of the operation failed. |
* inode 'ip'. Returns 0 on success, or -1 of the operation failed. |
Line 102 ufsdirhash_build(struct inode *ip) |
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Line 109 ufsdirhash_build(struct inode *ip) |
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struct vnode *vp; |
struct vnode *vp; |
doff_t bmask, pos; |
doff_t bmask, pos; |
int dirblocks, i, j, memreqd, nblocks, narrays, nslots, slot; |
int dirblocks, i, j, memreqd, nblocks, narrays, nslots, slot; |
const int needswap = UFS_MPNEEDSWAP(ip->i_ump); |
const int needswap = UFS_MPNEEDSWAP(ip->i_ump); |
int dirblksiz = ip->i_ump->um_dirblksiz; |
int dirblksiz = ip->i_ump->um_dirblksiz; |
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/* Check if we can/should use dirhash. */ |
/* Check if we can/should use dirhash. */ |
Line 165 ufsdirhash_build(struct inode *ip) |
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Line 172 ufsdirhash_build(struct inode *ip) |
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DIRHASHLIST_UNLOCK(); |
DIRHASHLIST_UNLOCK(); |
return (-1); |
return (-1); |
} |
} |
MALLOC(dh->dh_hash, doff_t **, narrays * sizeof(dh->dh_hash[0]), |
mutex_init(&dh->dh_lock, MUTEX_DEFAULT, IPL_NONE); |
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dh->dh_hash = (doff_t **)malloc(narrays * sizeof(dh->dh_hash[0]), |
M_DIRHASH, M_NOWAIT | M_ZERO); |
M_DIRHASH, M_NOWAIT | M_ZERO); |
MALLOC(dh->dh_blkfree, u_int8_t *, nblocks * sizeof(dh->dh_blkfree[0]), |
dh->dh_blkfree = (u_int8_t *)malloc(nblocks * sizeof(dh->dh_blkfree[0]), |
M_DIRHASH, M_NOWAIT); |
M_DIRHASH, M_NOWAIT); |
if (dh->dh_hash == NULL || dh->dh_blkfree == NULL) |
if (dh->dh_hash == NULL || dh->dh_blkfree == NULL) |
goto fail; |
goto fail; |
Line 196 ufsdirhash_build(struct inode *ip) |
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Line 204 ufsdirhash_build(struct inode *ip) |
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bmask = VFSTOUFS(vp->v_mount)->um_mountp->mnt_stat.f_iosize - 1; |
bmask = VFSTOUFS(vp->v_mount)->um_mountp->mnt_stat.f_iosize - 1; |
pos = 0; |
pos = 0; |
while (pos < ip->i_size) { |
while (pos < ip->i_size) { |
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if ((curcpu()->ci_schedstate.spc_flags & SPCF_SHOULDYIELD) |
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!= 0) { |
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preempt(); |
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} |
/* If necessary, get the next directory block. */ |
/* If necessary, get the next directory block. */ |
if ((pos & bmask) == 0) { |
if ((pos & bmask) == 0) { |
if (bp != NULL) |
if (bp != NULL) |
brelse(bp); |
brelse(bp, 0); |
if (VOP_BLKATOFF(vp, (off_t)pos, NULL, &bp) != 0) |
if (ufs_blkatoff(vp, (off_t)pos, NULL, &bp) != 0) |
goto fail; |
goto fail; |
} |
} |
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Line 209 ufsdirhash_build(struct inode *ip) |
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Line 221 ufsdirhash_build(struct inode *ip) |
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if (ep->d_reclen == 0 || ep->d_reclen > |
if (ep->d_reclen == 0 || ep->d_reclen > |
dirblksiz - (pos & (dirblksiz - 1))) { |
dirblksiz - (pos & (dirblksiz - 1))) { |
/* Corrupted directory. */ |
/* Corrupted directory. */ |
brelse(bp); |
brelse(bp, 0); |
goto fail; |
goto fail; |
} |
} |
if (ep->d_ino != 0) { |
if (ep->d_ino != 0) { |
Line 226 ufsdirhash_build(struct inode *ip) |
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Line 238 ufsdirhash_build(struct inode *ip) |
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} |
} |
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if (bp != NULL) |
if (bp != NULL) |
brelse(bp); |
brelse(bp, 0); |
DIRHASHLIST_LOCK(); |
DIRHASHLIST_LOCK(); |
TAILQ_INSERT_TAIL(&ufsdirhash_list, dh, dh_list); |
TAILQ_INSERT_TAIL(&ufsdirhash_list, dh, dh_list); |
dh->dh_onlist = 1; |
dh->dh_onlist = 1; |
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} |
} |
if (dh->dh_blkfree != NULL) |
if (dh->dh_blkfree != NULL) |
FREE(dh->dh_blkfree, M_DIRHASH); |
FREE(dh->dh_blkfree, M_DIRHASH); |
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mutex_destroy(&dh->dh_lock); |
FREE(dh, M_DIRHASH); |
FREE(dh, M_DIRHASH); |
ip->i_dirhash = NULL; |
ip->i_dirhash = NULL; |
DIRHASHLIST_LOCK(); |
DIRHASHLIST_LOCK(); |
Line 280 ufsdirhash_free(struct inode *ip) |
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Line 293 ufsdirhash_free(struct inode *ip) |
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dh->dh_narrays * DH_NBLKOFF * sizeof(**dh->dh_hash) + |
dh->dh_narrays * DH_NBLKOFF * sizeof(**dh->dh_hash) + |
dh->dh_nblk * sizeof(*dh->dh_blkfree); |
dh->dh_nblk * sizeof(*dh->dh_blkfree); |
} |
} |
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mutex_destroy(&dh->dh_lock); |
FREE(dh, M_DIRHASH); |
FREE(dh, M_DIRHASH); |
ip->i_dirhash = NULL; |
ip->i_dirhash = NULL; |
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Line 309 ufsdirhash_lookup(struct inode *ip, cons |
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Line 323 ufsdirhash_lookup(struct inode *ip, cons |
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struct buf *bp; |
struct buf *bp; |
doff_t blkoff, bmask, offset, prevoff; |
doff_t blkoff, bmask, offset, prevoff; |
int i, slot; |
int i, slot; |
const int needswap = UFS_MPNEEDSWAP(ip->i_ump); |
const int needswap = UFS_MPNEEDSWAP(ip->i_ump); |
int dirblksiz = ip->i_ump->um_dirblksiz; |
int dirblksiz = ip->i_ump->um_dirblksiz; |
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if ((dh = ip->i_dirhash) == NULL) |
if ((dh = ip->i_dirhash) == NULL) |
return (EJUSTRETURN); |
return (EJUSTRETURN); |
/* |
/* |
* Move this dirhash towards the end of the list if it has a |
* Move this dirhash towards the end of the list if it has a |
* score higher than the next entry, and acquire the dh_mtx. |
* score higher than the next entry, and acquire the dh_lock. |
* Optimise the case where it's already the last by performing |
* Optimise the case where it's already the last by performing |
* an unlocked read of the TAILQ_NEXT pointer. |
* an unlocked read of the TAILQ_NEXT pointer. |
* |
* |
* In both cases, end up holding just dh_mtx. |
* In both cases, end up holding just dh_lock. |
*/ |
*/ |
if (TAILQ_NEXT(dh, dh_list) != NULL) { |
if (TAILQ_NEXT(dh, dh_list) != NULL) { |
DIRHASHLIST_LOCK(); |
DIRHASHLIST_LOCK(); |
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* We found an entry with the expected offset. This |
* We found an entry with the expected offset. This |
* is probably the entry we want, but if not, the |
* is probably the entry we want, but if not, the |
* code below will turn off seqoff and retry. |
* code below will turn off seqoff and retry. |
*/ |
*/ |
slot = i; |
slot = i; |
} else |
} else |
dh->dh_seqopt = 0; |
dh->dh_seqopt = 0; |
} |
} |
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panic("ufsdirhash_lookup: bad offset in hash array"); |
panic("ufsdirhash_lookup: bad offset in hash array"); |
if ((offset & ~bmask) != blkoff) { |
if ((offset & ~bmask) != blkoff) { |
if (bp != NULL) |
if (bp != NULL) |
brelse(bp); |
brelse(bp, 0); |
blkoff = offset & ~bmask; |
blkoff = offset & ~bmask; |
if (VOP_BLKATOFF(vp, (off_t)blkoff, NULL, &bp) != 0) |
if (ufs_blkatoff(vp, (off_t)blkoff, NULL, &bp) != 0) |
return (EJUSTRETURN); |
return (EJUSTRETURN); |
} |
} |
dp = (struct direct *)(bp->b_data + (offset & bmask)); |
dp = (struct direct *)((char *)bp->b_data + (offset & bmask)); |
if (dp->d_reclen == 0 || dp->d_reclen > |
if (dp->d_reclen == 0 || dp->d_reclen > |
dirblksiz - (offset & (dirblksiz - 1))) { |
dirblksiz - (offset & (dirblksiz - 1))) { |
/* Corrupted directory. */ |
/* Corrupted directory. */ |
brelse(bp); |
brelse(bp, 0); |
return (EJUSTRETURN); |
return (EJUSTRETURN); |
} |
} |
if (dp->d_namlen == namelen && |
if (dp->d_namlen == namelen && |
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prevoff = ufsdirhash_getprev(dp, |
prevoff = ufsdirhash_getprev(dp, |
offset, dirblksiz); |
offset, dirblksiz); |
if (prevoff == -1) { |
if (prevoff == -1) { |
brelse(bp); |
brelse(bp, 0); |
return (EJUSTRETURN); |
return (EJUSTRETURN); |
} |
} |
} else |
} else |
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if (dh->dh_hash == NULL) { |
if (dh->dh_hash == NULL) { |
DIRHASH_UNLOCK(dh); |
DIRHASH_UNLOCK(dh); |
if (bp != NULL) |
if (bp != NULL) |
brelse(bp); |
brelse(bp, 0); |
ufsdirhash_free(ip); |
ufsdirhash_free(ip); |
return (EJUSTRETURN); |
return (EJUSTRETURN); |
} |
} |
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} |
} |
DIRHASH_UNLOCK(dh); |
DIRHASH_UNLOCK(dh); |
if (bp != NULL) |
if (bp != NULL) |
brelse(bp); |
brelse(bp, 0); |
return (ENOENT); |
return (ENOENT); |
} |
} |
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Line 478 ufsdirhash_findfree(struct inode *ip, in |
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Line 492 ufsdirhash_findfree(struct inode *ip, in |
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struct buf *bp; |
struct buf *bp; |
doff_t pos, slotstart; |
doff_t pos, slotstart; |
int dirblock, error, freebytes, i; |
int dirblock, error, freebytes, i; |
const int needswap = UFS_MPNEEDSWAP(ip->i_ump); |
const int needswap = UFS_MPNEEDSWAP(ip->i_ump); |
int dirblksiz = ip->i_ump->um_dirblksiz; |
int dirblksiz = ip->i_ump->um_dirblksiz; |
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if ((dh = ip->i_dirhash) == NULL) |
if ((dh = ip->i_dirhash) == NULL) |
Line 504 ufsdirhash_findfree(struct inode *ip, in |
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Line 518 ufsdirhash_findfree(struct inode *ip, in |
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dh->dh_blkfree[dirblock] >= howmany(slotneeded, DIRALIGN)); |
dh->dh_blkfree[dirblock] >= howmany(slotneeded, DIRALIGN)); |
DIRHASH_UNLOCK(dh); |
DIRHASH_UNLOCK(dh); |
pos = dirblock * dirblksiz; |
pos = dirblock * dirblksiz; |
error = VOP_BLKATOFF(ip->i_vnode, (off_t)pos, (void *)&dp, &bp); |
error = ufs_blkatoff(ip->i_vnode, (off_t)pos, (void *)&dp, &bp); |
if (error) |
if (error) |
return (-1); |
return (-1); |
/* Find the first entry with free space. */ |
/* Find the first entry with free space. */ |
for (i = 0; i < dirblksiz; ) { |
for (i = 0; i < dirblksiz; ) { |
if (dp->d_reclen == 0) { |
if (dp->d_reclen == 0) { |
brelse(bp); |
brelse(bp, 0); |
return (-1); |
return (-1); |
} |
} |
if (dp->d_ino == 0 || dp->d_reclen > DIRSIZ(0, dp, needswap)) |
if (dp->d_ino == 0 || dp->d_reclen > DIRSIZ(0, dp, needswap)) |
Line 519 ufsdirhash_findfree(struct inode *ip, in |
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Line 533 ufsdirhash_findfree(struct inode *ip, in |
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dp = (struct direct *)((char *)dp + dp->d_reclen); |
dp = (struct direct *)((char *)dp + dp->d_reclen); |
} |
} |
if (i > dirblksiz) { |
if (i > dirblksiz) { |
brelse(bp); |
brelse(bp, 0); |
return (-1); |
return (-1); |
} |
} |
slotstart = pos + i; |
slotstart = pos + i; |
Line 531 ufsdirhash_findfree(struct inode *ip, in |
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Line 545 ufsdirhash_findfree(struct inode *ip, in |
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if (dp->d_ino != 0) |
if (dp->d_ino != 0) |
freebytes -= DIRSIZ(0, dp, needswap); |
freebytes -= DIRSIZ(0, dp, needswap); |
if (dp->d_reclen == 0) { |
if (dp->d_reclen == 0) { |
brelse(bp); |
brelse(bp, 0); |
return (-1); |
return (-1); |
} |
} |
i += dp->d_reclen; |
i += dp->d_reclen; |
dp = (struct direct *)((char *)dp + dp->d_reclen); |
dp = (struct direct *)((char *)dp + dp->d_reclen); |
} |
} |
if (i > dirblksiz) { |
if (i > dirblksiz) { |
brelse(bp); |
brelse(bp, 0); |
return (-1); |
return (-1); |
} |
} |
if (freebytes < slotneeded) |
if (freebytes < slotneeded) |
panic("ufsdirhash_findfree: free mismatch"); |
panic("ufsdirhash_findfree: free mismatch"); |
brelse(bp); |
brelse(bp, 0); |
*slotsize = pos + i - slotstart; |
*slotsize = pos + i - slotstart; |
return (slotstart); |
return (slotstart); |
} |
} |
Line 780 ufsdirhash_dirtrunc(struct inode *ip, do |
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Line 794 ufsdirhash_dirtrunc(struct inode *ip, do |
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* a directory block matches its actual contents. Panics if a mismatch |
* a directory block matches its actual contents. Panics if a mismatch |
* is detected. |
* is detected. |
* |
* |
* On entry, `buf' should point to the start of an in-core |
* On entry, `sbuf' should point to the start of an in-core |
* DIRBLKSIZ-sized directory block, and `offset' should contain the |
* DIRBLKSIZ-sized directory block, and `offset' should contain the |
* offset from the start of the directory of that block. |
* offset from the start of the directory of that block. |
*/ |
*/ |
void |
void |
ufsdirhash_checkblock(struct inode *ip, char *buf, doff_t offset) |
ufsdirhash_checkblock(struct inode *ip, char *sbuf, doff_t offset) |
{ |
{ |
struct dirhash *dh; |
struct dirhash *dh; |
struct direct *dp; |
struct direct *dp; |
Line 810 ufsdirhash_checkblock(struct inode *ip, |
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Line 824 ufsdirhash_checkblock(struct inode *ip, |
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nfree = 0; |
nfree = 0; |
for (i = 0; i < dirblksiz; i += dp->d_reclen) { |
for (i = 0; i < dirblksiz; i += dp->d_reclen) { |
dp = (struct direct *)(buf + i); |
dp = (struct direct *)(sbuf + i); |
if (dp->d_reclen == 0 || i + dp->d_reclen > dirblksiz) |
if (dp->d_reclen == 0 || i + dp->d_reclen > dirblksiz) |
panic("ufsdirhash_checkblock: bad dir"); |
panic("ufsdirhash_checkblock: bad dir"); |
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Line 873 ufsdirhash_hash(struct dirhash *dh, cons |
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Line 887 ufsdirhash_hash(struct dirhash *dh, cons |
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* by the value specified by `diff'. |
* by the value specified by `diff'. |
* |
* |
* The caller must ensure we have exclusive access to `dh'; normally |
* The caller must ensure we have exclusive access to `dh'; normally |
* that means that dh_mtx should be held, but this is also called |
* that means that dh_lock should be held, but this is also called |
* from ufsdirhash_build() where exclusive access can be assumed. |
* from ufsdirhash_build() where exclusive access can be assumed. |
*/ |
*/ |
static void |
static void |
Line 917 ufsdirhash_findslot(struct dirhash *dh, |
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Line 931 ufsdirhash_findslot(struct dirhash *dh, |
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{ |
{ |
int slot; |
int slot; |
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KASSERT(mutex_owned(&dh->dh_lock)); |
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KASSERT(mutex_owned(&dh->dh_lock)); |
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/* Find the entry. */ |
/* Find the entry. */ |
KASSERT(dh->dh_hused < dh->dh_hlen); |
KASSERT(dh->dh_hused < dh->dh_hlen); |
slot = ufsdirhash_hash(dh, name, namelen); |
slot = ufsdirhash_hash(dh, name, namelen); |
Line 939 ufsdirhash_delslot(struct dirhash *dh, i |
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Line 957 ufsdirhash_delslot(struct dirhash *dh, i |
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{ |
{ |
int i; |
int i; |
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KASSERT(mutex_owned(&dh->dh_lock)); |
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KASSERT(mutex_owned(&dh->dh_lock)); |
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/* Mark the entry as deleted. */ |
/* Mark the entry as deleted. */ |
DH_ENTRY(dh, slot) = DIRHASH_DEL; |
DH_ENTRY(dh, slot) = DIRHASH_DEL; |
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Line 1049 ufsdirhash_recycle(int wanted) |
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Line 1071 ufsdirhash_recycle(int wanted) |
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void |
void |
ufsdirhash_init() |
ufsdirhash_init() |
{ |
{ |
#ifdef _LKM |
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pool_init(&ufsdirhash_pool, DH_NBLKOFF * sizeof(daddr_t), 0, 0, 0, |
pool_init(&ufsdirhash_pool, DH_NBLKOFF * sizeof(daddr_t), 0, 0, 0, |
"ufsdirhash", &pool_allocator_nointr); |
"ufsdirhash", &pool_allocator_nointr, IPL_NONE); |
#endif |
mutex_init(&ufsdirhash_lock, MUTEX_DEFAULT, IPL_NONE); |
TAILQ_INIT(&ufsdirhash_list); |
TAILQ_INIT(&ufsdirhash_list); |
} |
} |
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void |
void |
ufsdirhash_done() |
ufsdirhash_done(void) |
{ |
{ |
KASSERT(TAILQ_EMPTY(&ufsdirhash_list)); |
KASSERT(TAILQ_EMPTY(&ufsdirhash_list)); |
#ifdef _LKM |
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pool_destroy(&ufsdirhash_pool); |
pool_destroy(&ufsdirhash_pool); |
#endif |
mutex_destroy(&ufsdirhash_lock); |
} |
} |
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SYSCTL_SETUP(sysctl_vfs_ufs_setup, "sysctl vfs.ufs.dirhash subtree setup") |
SYSCTL_SETUP(sysctl_vfs_ufs_setup, "sysctl vfs.ufs.dirhash subtree setup") |
{ |
{ |
struct sysctlnode *rnode, *cnode; |
const struct sysctlnode *rnode, *cnode; |
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sysctl_createv(clog, 0, NULL, &rnode, |
sysctl_createv(clog, 0, NULL, &rnode, |
CTLFLAG_PERMANENT, |
CTLFLAG_PERMANENT, |
Line 1117 SYSCTL_SETUP(sysctl_vfs_ufs_setup, "sysc |
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Line 1137 SYSCTL_SETUP(sysctl_vfs_ufs_setup, "sysc |
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NULL, 0, &ufs_dirhashcheck, 0, |
NULL, 0, &ufs_dirhashcheck, 0, |
CTL_CREATE, CTL_EOL); |
CTL_CREATE, CTL_EOL); |
} |
} |
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#endif /* UFS_DIRHASH */ |
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