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-rw-r--r--fs/xfs/xfs_alloc.c8
-rw-r--r--fs/xfs/xfs_bmap.c7
-rw-r--r--fs/xfs/xfs_filestream.c13
-rw-r--r--fs/xfs/xfs_fsops.c42
-rw-r--r--fs/xfs/xfs_ialloc.c25
-rw-r--r--fs/xfs/xfs_itable.c4
-rw-r--r--fs/xfs/xfs_mount.c63
-rw-r--r--fs/xfs/xfs_mount.h14
8 files changed, 86 insertions, 90 deletions
diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index 84070f2..4d66bb7 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -2276,7 +2276,6 @@ xfs_alloc_vextent(
* These three force us into a single a.g.
*/
args->agno = XFS_FSB_TO_AGNO(mp, args->fsbno);
- down_read(&mp->m_peraglock);
args->pag = xfs_perag_get(mp, args->agno);
args->minleft = 0;
error = xfs_alloc_fix_freelist(args, 0);
@@ -2286,14 +2285,12 @@ xfs_alloc_vextent(
goto error0;
}
if (!args->agbp) {
- up_read(&mp->m_peraglock);
trace_xfs_alloc_vextent_noagbp(args);
break;
}
args->agbno = XFS_FSB_TO_AGBNO(mp, args->fsbno);
if ((error = xfs_alloc_ag_vextent(args)))
goto error0;
- up_read(&mp->m_peraglock);
break;
case XFS_ALLOCTYPE_START_BNO:
/*
@@ -2345,7 +2342,6 @@ xfs_alloc_vextent(
* Loop over allocation groups twice; first time with
* trylock set, second time without.
*/
- down_read(&mp->m_peraglock);
for (;;) {
args->pag = xfs_perag_get(mp, args->agno);
if (no_min) args->minleft = 0;
@@ -2408,7 +2404,6 @@ xfs_alloc_vextent(
}
xfs_perag_put(args->pag);
}
- up_read(&mp->m_peraglock);
if (bump_rotor || (type == XFS_ALLOCTYPE_ANY_AG)) {
if (args->agno == sagno)
mp->m_agfrotor = (mp->m_agfrotor + 1) %
@@ -2438,7 +2433,6 @@ xfs_alloc_vextent(
return 0;
error0:
xfs_perag_put(args->pag);
- up_read(&mp->m_peraglock);
return error;
}
@@ -2463,7 +2457,6 @@ xfs_free_extent(
args.agno = XFS_FSB_TO_AGNO(args.mp, bno);
ASSERT(args.agno < args.mp->m_sb.sb_agcount);
args.agbno = XFS_FSB_TO_AGBNO(args.mp, bno);
- down_read(&args.mp->m_peraglock);
args.pag = xfs_perag_get(args.mp, args.agno);
if ((error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING)))
goto error0;
@@ -2475,7 +2468,6 @@ xfs_free_extent(
error = xfs_free_ag_extent(tp, args.agbp, args.agno, args.agbno, len, 0);
error0:
xfs_perag_put(args.pag);
- up_read(&args.mp->m_peraglock);
return error;
}
diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
index a9b95d9..7c6d9ac 100644
--- a/fs/xfs/xfs_bmap.c
+++ b/fs/xfs/xfs_bmap.c
@@ -2629,14 +2629,12 @@ xfs_bmap_btalloc(
if (startag == NULLAGNUMBER)
startag = ag = 0;
notinit = 0;
- down_read(&mp->m_peraglock);
pag = xfs_perag_get(mp, ag);
while (blen < ap->alen) {
if (!pag->pagf_init &&
(error = xfs_alloc_pagf_init(mp, args.tp,
ag, XFS_ALLOC_FLAG_TRYLOCK))) {
xfs_perag_put(pag);
- up_read(&mp->m_peraglock);
return error;
}
/*
@@ -2669,10 +2667,8 @@ xfs_bmap_btalloc(
error = xfs_filestream_new_ag(ap, &ag);
xfs_perag_put(pag);
- if (error) {
- up_read(&mp->m_peraglock);
+ if (error)
return error;
- }
/* loop again to set 'blen'*/
startag = NULLAGNUMBER;
@@ -2688,7 +2684,6 @@ xfs_bmap_btalloc(
pag = xfs_perag_get(mp, ag);
}
xfs_perag_put(pag);
- up_read(&mp->m_peraglock);
/*
* Since the above loop did a BUF_TRYLOCK, it is
* possible that there is space for this request.
diff --git a/fs/xfs/xfs_filestream.c b/fs/xfs/xfs_filestream.c
index e61f2aa..914d00d 100644
--- a/fs/xfs/xfs_filestream.c
+++ b/fs/xfs/xfs_filestream.c
@@ -253,8 +253,7 @@ next_ag:
/*
* Set the allocation group number for a file or a directory, updating inode
- * references and per-AG references as appropriate. Must be called with the
- * m_peraglock held in read mode.
+ * references and per-AG references as appropriate.
*/
static int
_xfs_filestream_update_ag(
@@ -456,10 +455,10 @@ xfs_filestream_unmount(
}
/*
- * If the mount point's m_perag array is going to be reallocated, all
+ * If the mount point's m_perag tree is going to be modified, all
* outstanding cache entries must be flushed to avoid accessing reference count
* addresses that have been freed. The call to xfs_filestream_flush() must be
- * made inside the block that holds the m_peraglock in write mode to do the
+ * made inside the block that holds the m_perag_lock in write mode to do the
* reallocation.
*/
void
@@ -531,7 +530,6 @@ xfs_filestream_associate(
mp = pip->i_mount;
cache = mp->m_filestream;
- down_read(&mp->m_peraglock);
/*
* We have a problem, Houston.
@@ -548,10 +546,8 @@ xfs_filestream_associate(
*
* So, if we can't get the iolock without sleeping then just give up
*/
- if (!xfs_ilock_nowait(pip, XFS_IOLOCK_EXCL)) {
- up_read(&mp->m_peraglock);
+ if (!xfs_ilock_nowait(pip, XFS_IOLOCK_EXCL))
return 1;
- }
/* If the parent directory is already in the cache, use its AG. */
item = xfs_mru_cache_lookup(cache, pip->i_ino);
@@ -606,7 +602,6 @@ exit_did_pick:
exit:
xfs_iunlock(pip, XFS_IOLOCK_EXCL);
- up_read(&mp->m_peraglock);
return -err;
}
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index a13919a..37a6f62 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -167,27 +167,14 @@ xfs_growfs_data_private(
}
new = nb - mp->m_sb.sb_dblocks;
oagcount = mp->m_sb.sb_agcount;
- if (nagcount > oagcount) {
- void *new_perag, *old_perag;
-
- xfs_filestream_flush(mp);
-
- new_perag = kmem_zalloc(sizeof(xfs_perag_t) * nagcount,
- KM_MAYFAIL);
- if (!new_perag)
- return XFS_ERROR(ENOMEM);
-
- down_write(&mp->m_peraglock);
- memcpy(new_perag, mp->m_perag, sizeof(xfs_perag_t) * oagcount);
- old_perag = mp->m_perag;
- mp->m_perag = new_perag;
-
- mp->m_flags |= XFS_MOUNT_32BITINODES;
- nagimax = xfs_initialize_perag(mp, nagcount);
- up_write(&mp->m_peraglock);
- kmem_free(old_perag);
+ /* allocate the new per-ag structures */
+ if (nagcount > oagcount) {
+ error = xfs_initialize_perag(mp, nagcount, &nagimax);
+ if (error)
+ return error;
}
+
tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFS);
tp->t_flags |= XFS_TRANS_RESERVE;
if ((error = xfs_trans_reserve(tp, XFS_GROWFS_SPACE_RES(mp),
@@ -196,6 +183,11 @@ xfs_growfs_data_private(
return error;
}
+ /*
+ * Write new AG headers to disk. Non-transactional, but written
+ * synchronously so they are completed prior to the growfs transaction
+ * being logged.
+ */
nfree = 0;
for (agno = nagcount - 1; agno >= oagcount; agno--, new -= agsize) {
/*
@@ -359,6 +351,12 @@ xfs_growfs_data_private(
goto error0;
}
}
+
+ /*
+ * Update changed superblock fields transactionally. These are not
+ * seen by the rest of the world until the transaction commit applies
+ * them atomically to the superblock.
+ */
if (nagcount > oagcount)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_AGCOUNT, nagcount - oagcount);
if (nb > mp->m_sb.sb_dblocks)
@@ -369,9 +367,9 @@ xfs_growfs_data_private(
if (dpct)
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IMAXPCT, dpct);
error = xfs_trans_commit(tp, 0);
- if (error) {
+ if (error)
return error;
- }
+
/* New allocation groups fully initialized, so update mount struct */
if (nagimax)
mp->m_maxagi = nagimax;
@@ -381,6 +379,8 @@ xfs_growfs_data_private(
mp->m_maxicount = icount << mp->m_sb.sb_inopblog;
} else
mp->m_maxicount = 0;
+
+ /* update secondary superblocks. */
for (agno = 1; agno < nagcount; agno++) {
error = xfs_read_buf(mp, mp->m_ddev_targp,
XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index 884ee13..52c9d00 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -383,11 +383,9 @@ xfs_ialloc_ag_alloc(
newino = XFS_OFFBNO_TO_AGINO(args.mp, args.agbno, 0);
be32_add_cpu(&agi->agi_count, newlen);
be32_add_cpu(&agi->agi_freecount, newlen);
- down_read(&args.mp->m_peraglock);
pag = xfs_perag_get(args.mp, agno);
pag->pagi_freecount += newlen;
xfs_perag_put(pag);
- up_read(&args.mp->m_peraglock);
agi->agi_newino = cpu_to_be32(newino);
/*
@@ -489,7 +487,6 @@ xfs_ialloc_ag_select(
*/
agno = pagno;
flags = XFS_ALLOC_FLAG_TRYLOCK;
- down_read(&mp->m_peraglock);
for (;;) {
pag = xfs_perag_get(mp, agno);
if (!pag->pagi_init) {
@@ -531,7 +528,6 @@ xfs_ialloc_ag_select(
goto nextag;
}
xfs_perag_put(pag);
- up_read(&mp->m_peraglock);
return agbp;
}
}
@@ -544,18 +540,14 @@ nextag:
* No point in iterating over the rest, if we're shutting
* down.
*/
- if (XFS_FORCED_SHUTDOWN(mp)) {
- up_read(&mp->m_peraglock);
+ if (XFS_FORCED_SHUTDOWN(mp))
return NULL;
- }
agno++;
if (agno >= agcount)
agno = 0;
if (agno == pagno) {
- if (flags == 0) {
- up_read(&mp->m_peraglock);
+ if (flags == 0)
return NULL;
- }
flags = 0;
}
}
@@ -777,16 +769,13 @@ nextag:
*inop = NULLFSINO;
return noroom ? ENOSPC : 0;
}
- down_read(&mp->m_peraglock);
pag = xfs_perag_get(mp, tagno);
if (pag->pagi_inodeok == 0) {
xfs_perag_put(pag);
- up_read(&mp->m_peraglock);
goto nextag;
}
error = xfs_ialloc_read_agi(mp, tp, tagno, &agbp);
xfs_perag_put(pag);
- up_read(&mp->m_peraglock);
if (error)
goto nextag;
agi = XFS_BUF_TO_AGI(agbp);
@@ -1015,9 +1004,7 @@ alloc_inode:
goto error0;
be32_add_cpu(&agi->agi_freecount, -1);
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
- down_read(&mp->m_peraglock);
pag->pagi_freecount--;
- up_read(&mp->m_peraglock);
error = xfs_check_agi_freecount(cur, agi);
if (error)
@@ -1100,9 +1087,7 @@ xfs_difree(
/*
* Get the allocation group header.
*/
- down_read(&mp->m_peraglock);
error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
- up_read(&mp->m_peraglock);
if (error) {
cmn_err(CE_WARN,
"xfs_difree: xfs_ialloc_read_agi() returned an error %d on %s. Returning error.",
@@ -1169,11 +1154,9 @@ xfs_difree(
be32_add_cpu(&agi->agi_count, -ilen);
be32_add_cpu(&agi->agi_freecount, -(ilen - 1));
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_COUNT | XFS_AGI_FREECOUNT);
- down_read(&mp->m_peraglock);
pag = xfs_perag_get(mp, agno);
pag->pagi_freecount -= ilen - 1;
xfs_perag_put(pag);
- up_read(&mp->m_peraglock);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, -ilen);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -(ilen - 1));
@@ -1202,11 +1185,9 @@ xfs_difree(
*/
be32_add_cpu(&agi->agi_freecount, 1);
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
- down_read(&mp->m_peraglock);
pag = xfs_perag_get(mp, agno);
pag->pagi_freecount++;
xfs_perag_put(pag);
- up_read(&mp->m_peraglock);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, 1);
}
@@ -1328,9 +1309,7 @@ xfs_imap(
xfs_buf_t *agbp; /* agi buffer */
int i; /* temp state */
- down_read(&mp->m_peraglock);
error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
- up_read(&mp->m_peraglock);
if (error) {
xfs_fs_cmn_err(CE_ALERT, mp, "xfs_imap: "
"xfs_ialloc_read_agi() returned "
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index 62efab2..940307a 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -420,9 +420,7 @@ xfs_bulkstat(
while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
cond_resched();
bp = NULL;
- down_read(&mp->m_peraglock);
error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
- up_read(&mp->m_peraglock);
if (error) {
/*
* Skip this allocation group and go to the next one.
@@ -849,9 +847,7 @@ xfs_inumbers(
agbp = NULL;
while (left > 0 && agno < mp->m_sb.sb_agcount) {
if (agbp == NULL) {
- down_read(&mp->m_peraglock);
error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
- up_read(&mp->m_peraglock);
if (error) {
/*
* If we can't read the AGI of this ag,
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 9055b60..c04dd83 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -209,13 +209,16 @@ STATIC void
xfs_free_perag(
xfs_mount_t *mp)
{
- if (mp->m_perag) {
- int agno;
+ xfs_agnumber_t agno;
+ struct xfs_perag *pag;
- for (agno = 0; agno < mp->m_maxagi; agno++)
- if (mp->m_perag[agno].pagb_list)
- kmem_free(mp->m_perag[agno].pagb_list);
- kmem_free(mp->m_perag);
+ for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
+ spin_lock(&mp->m_perag_lock);
+ pag = radix_tree_delete(&mp->m_perag_tree, agno);
+ spin_unlock(&mp->m_perag_lock);
+ ASSERT(pag);
+ kmem_free(pag->pagb_list);
+ kmem_free(pag);
}
}
@@ -389,10 +392,11 @@ xfs_initialize_perag_icache(
}
}
-xfs_agnumber_t
+int
xfs_initialize_perag(
xfs_mount_t *mp,
- xfs_agnumber_t agcount)
+ xfs_agnumber_t agcount,
+ xfs_agnumber_t *maxagi)
{
xfs_agnumber_t index, max_metadata;
xfs_perag_t *pag;
@@ -405,6 +409,33 @@ xfs_initialize_perag(
agino = XFS_OFFBNO_TO_AGINO(mp, sbp->sb_agblocks - 1, 0);
ino = XFS_AGINO_TO_INO(mp, agcount - 1, agino);
+ /*
+ * Walk the current per-ag tree so we don't try to initialise AGs
+ * that already exist (growfs case). Allocate and insert all the
+ * AGs we don't find ready for initialisation.
+ */
+ for (index = 0; index < agcount; index++) {
+ pag = xfs_perag_get(mp, index);
+ if (pag) {
+ xfs_perag_put(pag);
+ continue;
+ }
+ pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL);
+ if (!pag)
+ return -ENOMEM;
+ if (radix_tree_preload(GFP_NOFS))
+ return -ENOMEM;
+ spin_lock(&mp->m_perag_lock);
+ if (radix_tree_insert(&mp->m_perag_tree, index, pag)) {
+ BUG();
+ spin_unlock(&mp->m_perag_lock);
+ kmem_free(pag);
+ return -EEXIST;
+ }
+ spin_unlock(&mp->m_perag_lock);
+ radix_tree_preload_end();
+ }
+
/* Clear the mount flag if no inode can overflow 32 bits
* on this filesystem, or if specifically requested..
*/
@@ -454,7 +485,9 @@ xfs_initialize_perag(
xfs_perag_put(pag);
}
}
- return index;
+ if (maxagi)
+ *maxagi = index;
+ return 0;
}
void
@@ -1155,13 +1188,13 @@ xfs_mountfs(
/*
* Allocate and initialize the per-ag data.
*/
- init_rwsem(&mp->m_peraglock);
- mp->m_perag = kmem_zalloc(sbp->sb_agcount * sizeof(xfs_perag_t),
- KM_MAYFAIL);
- if (!mp->m_perag)
+ spin_lock_init(&mp->m_perag_lock);
+ INIT_RADIX_TREE(&mp->m_perag_tree, GFP_NOFS);
+ error = xfs_initialize_perag(mp, sbp->sb_agcount, &mp->m_maxagi);
+ if (error) {
+ cmn_err(CE_WARN, "XFS: Failed per-ag init: %d", error);
goto out_remove_uuid;
-
- mp->m_maxagi = xfs_initialize_perag(mp, sbp->sb_agcount);
+ }
if (!sbp->sb_logblocks) {
cmn_err(CE_WARN, "XFS: no log defined");
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index f8a68a2..cfa7a5d 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -207,8 +207,8 @@ typedef struct xfs_mount {
uint m_ag_maxlevels; /* XFS_AG_MAXLEVELS */
uint m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
uint m_in_maxlevels; /* max inobt btree levels. */
- struct xfs_perag *m_perag; /* per-ag accounting info */
- struct rw_semaphore m_peraglock; /* lock for m_perag (pointer) */
+ struct radix_tree_root m_perag_tree; /* per-ag accounting info */
+ spinlock_t m_perag_lock; /* lock for m_perag_tree */
struct mutex m_growlock; /* growfs mutex */
int m_fixedfsid[2]; /* unchanged for life of FS */
uint m_dmevmask; /* DMI events for this FS */
@@ -389,7 +389,12 @@ xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
static inline struct xfs_perag *
xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno)
{
- return &mp->m_perag[agno];
+ struct xfs_perag *pag;
+
+ spin_lock(&mp->m_perag_lock);
+ pag = radix_tree_lookup(&mp->m_perag_tree, agno);
+ spin_unlock(&mp->m_perag_lock);
+ return pag;
}
static inline void
@@ -450,7 +455,8 @@ extern struct xfs_dmops xfs_dmcore_xfs;
#endif /* __KERNEL__ */
extern void xfs_mod_sb(struct xfs_trans *, __int64_t);
-extern xfs_agnumber_t xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t);
+extern int xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
+ xfs_agnumber_t *);
extern void xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
extern void xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
generated by cgit v1.1 at 2024-12-27 02:07:34 +0000