#include "xfs_bit.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
+#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
+#include "xfs_rmap.h"
#include "xfs_alloc_btree.h"
#include "xfs_alloc.h"
#include "xfs_extent_busy.h"
STATIC int xfs_alloc_ag_vextent_small(xfs_alloc_arg_t *,
xfs_btree_cur_t *, xfs_agblock_t *, xfs_extlen_t *, int *);
+xfs_extlen_t
+xfs_prealloc_blocks(
+ struct xfs_mount *mp)
+{
+ if (xfs_sb_version_hasrmapbt(&mp->m_sb))
+ return XFS_RMAP_BLOCK(mp) + 1;
+ if (xfs_sb_version_hasfinobt(&mp->m_sb))
+ return XFS_FIBT_BLOCK(mp) + 1;
+ return XFS_IBT_BLOCK(mp) + 1;
+}
+
+/*
+ * In order to avoid ENOSPC-related deadlock caused by out-of-order locking of
+ * AGF buffer (PV 947395), we place constraints on the relationship among
+ * actual allocations for data blocks, freelist blocks, and potential file data
+ * bmap btree blocks. However, these restrictions may result in no actual space
+ * allocated for a delayed extent, for example, a data block in a certain AG is
+ * allocated but there is no additional block for the additional bmap btree
+ * block due to a split of the bmap btree of the file. The result of this may
+ * lead to an infinite loop when the file gets flushed to disk and all delayed
+ * extents need to be actually allocated. To get around this, we explicitly set
+ * aside a few blocks which will not be reserved in delayed allocation.
+ *
+ * When rmap is disabled, we need to reserve 4 fsbs _per AG_ for the freelist
+ * and 4 more to handle a potential split of the file's bmap btree.
+ *
+ * When rmap is enabled, we must also be able to handle two rmap btree inserts
+ * to record both the file data extent and a new bmbt block. The bmbt block
+ * might not be in the same AG as the file data extent. In the worst case
+ * the bmap btree splits multiple levels and all the new blocks come from
+ * different AGs, so set aside enough to handle rmap btree splits in all AGs.
+ */
+unsigned int
+xfs_alloc_set_aside(
+ struct xfs_mount *mp)
+{
+ unsigned int blocks;
+
+ blocks = 4 + (mp->m_sb.sb_agcount * XFS_ALLOC_AGFL_RESERVE);
+ if (xfs_sb_version_hasrmapbt(&mp->m_sb))
+ blocks += mp->m_sb.sb_agcount * mp->m_rmap_maxlevels;
+ return blocks;
+}
+
+/*
+ * When deciding how much space to allocate out of an AG, we limit the
+ * allocation maximum size to the size the AG. However, we cannot use all the
+ * blocks in the AG - some are permanently used by metadata. These
+ * blocks are generally:
+ * - the AG superblock, AGF, AGI and AGFL
+ * - the AGF (bno and cnt) and AGI btree root blocks, and optionally
+ * the AGI free inode and rmap btree root blocks.
+ * - blocks on the AGFL according to xfs_alloc_set_aside() limits
+ * - the rmapbt root block
+ *
+ * The AG headers are sector sized, so the amount of space they take up is
+ * dependent on filesystem geometry. The others are all single blocks.
+ */
+unsigned int
+xfs_alloc_ag_max_usable(
+ struct xfs_mount *mp)
+{
+ unsigned int blocks;
+
+ blocks = XFS_BB_TO_FSB(mp, XFS_FSS_TO_BB(mp, 4)); /* ag headers */
+ blocks += XFS_ALLOC_AGFL_RESERVE;
+ blocks += 3; /* AGF, AGI btree root blocks */
+ if (xfs_sb_version_hasfinobt(&mp->m_sb))
+ blocks++; /* finobt root block */
+ if (xfs_sb_version_hasrmapbt(&mp->m_sb))
+ blocks++; /* rmap root block */
+
+ return mp->m_sb.sb_agblocks - blocks;
+}
+
/*
* Lookup the record equal to [bno, len] in the btree given by cur.
*/
ASSERT(!args->wasfromfl || !args->isfl);
ASSERT(args->agbno % args->alignment == 0);
+ /* if not file data, insert new block into the reverse map btree */
+ if (args->oinfo.oi_owner != XFS_RMAP_OWN_UNKNOWN) {
+ error = xfs_rmap_alloc(args->tp, args->agbp, args->agno,
+ args->agbno, args->len, &args->oinfo);
+ if (error)
+ return error;
+ }
+
if (!args->wasfromfl) {
error = xfs_alloc_update_counters(args->tp, args->pag,
args->agbp,
/*
* Free the extent starting at agno/bno for length.
*/
-STATIC int /* error */
+STATIC int
xfs_free_ag_extent(
- xfs_trans_t *tp, /* transaction pointer */
- xfs_buf_t *agbp, /* buffer for a.g. freelist header */
- xfs_agnumber_t agno, /* allocation group number */
- xfs_agblock_t bno, /* starting block number */
- xfs_extlen_t len, /* length of extent */
- int isfl) /* set if is freelist blocks - no sb acctg */
+ xfs_trans_t *tp,
+ xfs_buf_t *agbp,
+ xfs_agnumber_t agno,
+ xfs_agblock_t bno,
+ xfs_extlen_t len,
+ struct xfs_owner_info *oinfo,
+ int isfl)
{
xfs_btree_cur_t *bno_cur; /* cursor for by-block btree */
xfs_btree_cur_t *cnt_cur; /* cursor for by-size btree */
xfs_extlen_t nlen; /* new length of freespace */
xfs_perag_t *pag; /* per allocation group data */
+ bno_cur = cnt_cur = NULL;
mp = tp->t_mountp;
+
+ if (oinfo->oi_owner != XFS_RMAP_OWN_UNKNOWN) {
+ error = xfs_rmap_free(tp, agbp, agno, bno, len, oinfo);
+ if (error)
+ goto error0;
+ }
+
/*
* Allocate and initialize a cursor for the by-block btree.
*/
bno_cur = xfs_allocbt_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_BNO);
- cnt_cur = NULL;
/*
* Look for a neighboring block on the left (lower block numbers)
* that is contiguous with this space.
/* space needed by-size freespace btree */
min_free += min_t(unsigned int, pag->pagf_levels[XFS_BTNUM_CNTi] + 1,
mp->m_ag_maxlevels);
+ /* space needed reverse mapping used space btree */
+ if (xfs_sb_version_hasrmapbt(&mp->m_sb))
+ min_free += min_t(unsigned int,
+ pag->pagf_levels[XFS_BTNUM_RMAPi] + 1,
+ mp->m_rmap_maxlevels);
return min_free;
}
* anything other than extra overhead when we need to put more blocks
* back on the free list? Maybe we should only do this when space is
* getting low or the AGFL is more than half full?
+ *
+ * The NOSHRINK flag prevents the AGFL from being shrunk if it's too
+ * big; the NORMAP flag prevents AGFL expand/shrink operations from
+ * updating the rmapbt. Both flags are used in xfs_repair while we're
+ * rebuilding the rmapbt, and neither are used by the kernel. They're
+ * both required to ensure that rmaps are correctly recorded for the
+ * regenerated AGFL, bnobt, and cntbt. See repair/phase5.c and
+ * repair/rmap.c in xfsprogs for details.
*/
- while (pag->pagf_flcount > need) {
+ memset(&targs, 0, sizeof(targs));
+ if (flags & XFS_ALLOC_FLAG_NORMAP)
+ xfs_rmap_skip_owner_update(&targs.oinfo);
+ else
+ xfs_rmap_ag_owner(&targs.oinfo, XFS_RMAP_OWN_AG);
+ while (!(flags & XFS_ALLOC_FLAG_NOSHRINK) && pag->pagf_flcount > need) {
struct xfs_buf *bp;
error = xfs_alloc_get_freelist(tp, agbp, &bno, 0);
if (error)
goto out_agbp_relse;
- error = xfs_free_ag_extent(tp, agbp, args->agno, bno, 1, 1);
+ error = xfs_free_ag_extent(tp, agbp, args->agno, bno, 1,
+ &targs.oinfo, 1);
if (error)
goto out_agbp_relse;
bp = xfs_btree_get_bufs(mp, tp, args->agno, bno, 0);
xfs_trans_binval(tp, bp);
}
- memset(&targs, 0, sizeof(targs));
targs.tp = tp;
targs.mp = mp;
targs.agbp = agbp;
offsetof(xfs_agf_t, agf_longest),
offsetof(xfs_agf_t, agf_btreeblks),
offsetof(xfs_agf_t, agf_uuid),
+ offsetof(xfs_agf_t, agf_rmap_blocks),
sizeof(xfs_agf_t)
};
be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNT]) > XFS_BTREE_MAXLEVELS)
return false;
+ if (xfs_sb_version_hasrmapbt(&mp->m_sb) &&
+ be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAP]) > XFS_BTREE_MAXLEVELS)
+ return false;
+
/*
* during growfs operations, the perag is not fully initialised,
* so we can't use it for any useful checking. growfs ensures we can't
be32_to_cpu(agf->agf_levels[XFS_BTNUM_BNOi]);
pag->pagf_levels[XFS_BTNUM_CNTi] =
be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi]);
+ pag->pagf_levels[XFS_BTNUM_RMAPi] =
+ be32_to_cpu(agf->agf_levels[XFS_BTNUM_RMAPi]);
spin_lock_init(&pag->pagb_lock);
pag->pagb_count = 0;
pag->pagb_tree = RB_ROOT;
xfs_free_extent(
struct xfs_trans *tp, /* transaction pointer */
xfs_fsblock_t bno, /* starting block number of extent */
- xfs_extlen_t len) /* length of extent */
+ xfs_extlen_t len, /* length of extent */
+ struct xfs_owner_info *oinfo) /* extent owner */
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_buf *agbp;
ASSERT(len != 0);
+ if (XFS_TEST_ERROR(false, mp,
+ XFS_ERRTAG_FREE_EXTENT,
+ XFS_RANDOM_FREE_EXTENT))
+ return -EIO;
+
error = xfs_free_extent_fix_freelist(tp, agno, &agbp);
if (error)
return error;
agbno + len <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_length),
err);
- error = xfs_free_ag_extent(tp, agbp, agno, agbno, len, 0);
+ error = xfs_free_ag_extent(tp, agbp, agno, agbno, len, oinfo, 0);
if (error)
goto err;
projects / cascardo / linux.git / blobdiff