version 1.14, 2007/03/12 18:18:38 |
version 1.20.10.1, 2008/01/08 22:12:04 |
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* $FreeBSD: src/sys/ufs/ufs/ufs_dirhash.c,v 1.3.2.8 2004/12/08 11:54:13 dwmalone Exp $ |
* $FreeBSD: src/sys/ufs/ufs/ufs_dirhash.c,v 1.3.2.8 2004/12/08 11:54:13 dwmalone Exp $ |
*/ |
*/ |
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#include <sys/cdefs.h> |
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__KERNEL_RCSID(0, "$NetBSD$"); |
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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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#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; |
Line 74 static doff_t ufsdirhash_getprev(struct |
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Line 76 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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static POOL_INIT(ufsdirhash_pool, DH_NBLKOFF * sizeof(daddr_t), 0, 0, 0, |
static pool_cache_t ufsdirhash_cache; |
"ufsdirhash", &pool_allocator_nointr, IPL_NONE); |
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#define DIRHASHLIST_LOCK() do { } while (0) |
#define DIRHASHLIST_LOCK() mutex_enter(&ufsdirhash_lock) |
#define DIRHASHLIST_UNLOCK() do { } while (0) |
#define DIRHASHLIST_UNLOCK() mutex_exit(&ufsdirhash_lock) |
#define DIRHASH_LOCK(dh) do { } while (0) |
#define DIRHASH_LOCK(dh) mutex_enter(&(dh)->dh_lock) |
#define DIRHASH_UNLOCK(dh) do { } while (0) |
#define DIRHASH_UNLOCK(dh) mutex_exit(&(dh)->dh_lock) |
#define DIRHASH_BLKALLOC_WAITOK() pool_get(&ufsdirhash_pool, PR_WAITOK) |
#define DIRHASH_BLKALLOC_WAITOK() \ |
#define DIRHASH_BLKFREE(ptr) pool_put(&ufsdirhash_pool, ptr) |
pool_cache_get(ufsdirhash_cache, PR_WAITOK) |
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#define DIRHASH_BLKFREE(ptr) \ |
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pool_cache_put(ufsdirhash_cache, 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 163 ufsdirhash_build(struct inode *ip) |
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Line 179 ufsdirhash_build(struct inode *ip) |
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DIRHASHLIST_UNLOCK(); |
DIRHASHLIST_UNLOCK(); |
return (-1); |
return (-1); |
} |
} |
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mutex_init(&dh->dh_lock, MUTEX_DEFAULT, IPL_NONE); |
dh->dh_hash = (doff_t **)malloc(narrays * sizeof(dh->dh_hash[0]), |
dh->dh_hash = (doff_t **)malloc(narrays * sizeof(dh->dh_hash[0]), |
M_DIRHASH, M_NOWAIT | M_ZERO); |
M_DIRHASH, M_NOWAIT | M_ZERO); |
dh->dh_blkfree = (u_int8_t *)malloc(nblocks * sizeof(dh->dh_blkfree[0]), |
dh->dh_blkfree = (u_int8_t *)malloc(nblocks * sizeof(dh->dh_blkfree[0]), |
Line 201 ufsdirhash_build(struct inode *ip) |
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Line 218 ufsdirhash_build(struct inode *ip) |
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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 (ufs_blkatoff(vp, (off_t)pos, NULL, &bp) != 0) |
if (ufs_blkatoff(vp, (off_t)pos, NULL, &bp) != 0) |
goto fail; |
goto fail; |
} |
} |
Line 211 ufsdirhash_build(struct inode *ip) |
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Line 228 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 228 ufsdirhash_build(struct inode *ip) |
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Line 245 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 282 ufsdirhash_free(struct inode *ip) |
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Line 300 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 318 ufsdirhash_lookup(struct inode *ip, cons |
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Line 337 ufsdirhash_lookup(struct inode *ip, cons |
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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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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 (ufs_blkatoff(vp, (off_t)blkoff, NULL, &bp) != 0) |
if (ufs_blkatoff(vp, (off_t)blkoff, NULL, &bp) != 0) |
return (EJUSTRETURN); |
return (EJUSTRETURN); |
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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 512 ufsdirhash_findfree(struct inode *ip, in |
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Line 531 ufsdirhash_findfree(struct inode *ip, in |
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/* 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 521 ufsdirhash_findfree(struct inode *ip, in |
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Line 540 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 533 ufsdirhash_findfree(struct inode *ip, in |
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Line 552 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 875 ufsdirhash_hash(struct dirhash *dh, cons |
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Line 894 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 919 ufsdirhash_findslot(struct dirhash *dh, |
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Line 938 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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/* 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 941 ufsdirhash_delslot(struct dirhash *dh, i |
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Line 962 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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/* 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 1051 ufsdirhash_recycle(int wanted) |
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Line 1074 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, |
mutex_init(&ufsdirhash_lock, MUTEX_DEFAULT, IPL_NONE); |
"ufsdirhash", &pool_allocator_nointr, IPL_NONE); |
malloc_type_attach(M_DIRHASH); |
#endif |
ufsdirhash_cache = pool_cache_init(DH_NBLKOFF * sizeof(daddr_t), 0, |
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0, 0, "ufsdirhash", NULL, IPL_NONE, NULL, NULL, NULL); |
TAILQ_INIT(&ufsdirhash_list); |
TAILQ_INIT(&ufsdirhash_list); |
} |
} |
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void |
void |
ufsdirhash_done(void) |
ufsdirhash_done(void) |
{ |
{ |
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KASSERT(TAILQ_EMPTY(&ufsdirhash_list)); |
KASSERT(TAILQ_EMPTY(&ufsdirhash_list)); |
#ifdef _LKM |
pool_cache_destroy(ufsdirhash_cache); |
pool_destroy(&ufsdirhash_pool); |
malloc_type_detach(M_DIRHASH); |
#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") |