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xfs: Replace per-ag array with a radix tree

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The use of an array for the per-ag structures requires reallocation
of the array when growing the filesystem. This requires locking
access to the array to avoid use after free situations, and the
locking is difficult to get right. To avoid needing to reallocate an
array, change the per-ag structures to an allocated object per ag
and index them using a tree structure.

The AGs are always densely indexed (hence the use of an array), but
the number supported is 2^32 and lookups tend to be random and hence
indexing needs to scale. A simple choice is a radix tree - it works
well with this sort of index.  This change also removes another
large contiguous allocation from the mount/growfs path in XFS.

The growing process now needs to change to only initialise the new
AGs required for the extra space, and as such only needs to
exclusively lock the tree for inserts. The rest of the code only
needs to lock the tree while doing lookups, and hence this will
remove all the deadlocks that currently occur on the m_perag_lock as
it is now an innermost lock. The lock is also changed to a spinlock
from a read/write lock as the hold time is now extremely short.

To complete the picture, the per-ag structures will need to be
reference counted to ensure that we don't free/modify them while
they are still in use.  This will be done in subsequent patch.

Signed-off-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-01-11 11:47:44 +00:00 committed by Alex Elder
parent 44b56e0a1a
commit 1c1c6ebcf5
8 changed files with 86 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/xfs/xfs_alloc.c
View File

@ -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;
}

7
fs/xfs/xfs_bmap.c
View File

@ -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.

13
fs/xfs/xfs_filestream.c
View File

@ -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;
}

42
fs/xfs/xfs_fsops.c
View File

@ -167,27 +167,14 @@ xfs_growfs_data_private(
}
new = nb - mp->m_sb.sb_dblocks;
oagcount = mp->m_sb.sb_agcount;
/* allocate the new per-ag structures */
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);
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)),

25
fs/xfs/xfs_ialloc.c
View File

@ -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 "

4
fs/xfs/xfs_itable.c
View File

@ -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,

63
fs/xfs/xfs_mount.c
View File

@ -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");

14
fs/xfs/xfs_mount.h
View File

@ -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);