int);
STATIC void xfs_icsb_balance_counter_locked(xfs_mount_t *, xfs_sb_field_t,
int);
-STATIC int xfs_icsb_modify_counters(xfs_mount_t *, xfs_sb_field_t,
- int64_t, int);
STATIC void xfs_icsb_disable_counter(xfs_mount_t *, xfs_sb_field_t);
-
#else
#define xfs_icsb_balance_counter(mp, a, b) do { } while (0)
#define xfs_icsb_balance_counter_locked(mp, a, b) do { } while (0)
-#define xfs_icsb_modify_counters(mp, a, b, c) do { } while (0)
-
#endif
static const struct {
/*
* Reference counting access wrappers to the perag structures.
+ * Because we never free per-ag structures, the only thing we
+ * have to protect against changes is the tree structure itself.
*/
struct xfs_perag *
xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno)
struct xfs_perag *pag;
int ref = 0;
- spin_lock(&mp->m_perag_lock);
+ rcu_read_lock();
pag = radix_tree_lookup(&mp->m_perag_tree, agno);
if (pag) {
ASSERT(atomic_read(&pag->pag_ref) >= 0);
- /* catch leaks in the positive direction during testing */
- ASSERT(atomic_read(&pag->pag_ref) < 1000);
ref = atomic_inc_return(&pag->pag_ref);
}
- spin_unlock(&mp->m_perag_lock);
+ rcu_read_unlock();
trace_xfs_perag_get(mp, agno, ref, _RET_IP_);
return pag;
}
+/*
+ * search from @first to find the next perag with the given tag set.
+ */
+struct xfs_perag *
+xfs_perag_get_tag(
+ struct xfs_mount *mp,
+ xfs_agnumber_t first,
+ int tag)
+{
+ struct xfs_perag *pag;
+ int found;
+ int ref;
+
+ rcu_read_lock();
+ found = radix_tree_gang_lookup_tag(&mp->m_perag_tree,
+ (void **)&pag, first, 1, tag);
+ if (found <= 0) {
+ rcu_read_unlock();
+ return NULL;
+ }
+ ref = atomic_inc_return(&pag->pag_ref);
+ rcu_read_unlock();
+ trace_xfs_perag_get_tag(mp, pag->pag_agno, ref, _RET_IP_);
+ return pag;
+}
+
void
xfs_perag_put(struct xfs_perag *pag)
{
trace_xfs_perag_put(pag->pag_mount, pag->pag_agno, ref, _RET_IP_);
}
+STATIC void
+__xfs_free_perag(
+ struct rcu_head *head)
+{
+ struct xfs_perag *pag = container_of(head, struct xfs_perag, rcu_head);
+
+ ASSERT(atomic_read(&pag->pag_ref) == 0);
+ kmem_free(pag);
+}
+
/*
- * Free up the resources associated with a mount structure. Assume that
- * the structure was initially zeroed, so we can tell which fields got
- * initialized.
+ * Free up the per-ag resources associated with the mount structure.
*/
STATIC void
xfs_free_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);
- ASSERT(pag);
- ASSERT(atomic_read(&pag->pag_ref) == 0);
spin_unlock(&mp->m_perag_lock);
- kmem_free(pag);
+ ASSERT(pag);
+ call_rcu(&pag->rcu_head, __xfs_free_perag);
}
}
pag->pag_agno = index;
pag->pag_mount = mp;
rwlock_init(&pag->pag_ici_lock);
+ mutex_init(&pag->pag_ici_reclaim_lock);
INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
+ spin_lock_init(&pag->pag_buf_lock);
+ pag->pag_buf_tree = RB_ROOT;
if (radix_tree_preload(GFP_NOFS))
goto out_unwind;
xfs_readsb(xfs_mount_t *mp, int flags)
{
unsigned int sector_size;
- unsigned int extra_flags;
xfs_buf_t *bp;
int error;
* access to the superblock.
*/
sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
- extra_flags = XBF_LOCK | XBF_FS_MANAGED | XBF_MAPPED;
- bp = xfs_buf_read(mp->m_ddev_targp, XFS_SB_DADDR, BTOBB(sector_size),
- extra_flags);
- if (!bp || XFS_BUF_ISERROR(bp)) {
- xfs_fs_mount_cmn_err(flags, "SB read failed");
- error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
- goto fail;
+reread:
+ bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
+ XFS_SB_DADDR, sector_size, 0);
+ if (!bp) {
+ xfs_fs_mount_cmn_err(flags, "SB buffer read failed");
+ return EIO;
}
- ASSERT(XFS_BUF_ISBUSY(bp));
- ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
/*
* Initialize the mount structure from the superblock.
* But first do some basic consistency checking.
*/
xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp));
-
error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags);
if (error) {
xfs_fs_mount_cmn_err(flags, "SB validate failed");
- goto fail;
+ goto release_buf;
}
/*
"device supports only %u byte sectors (not %u)",
sector_size, mp->m_sb.sb_sectsize);
error = ENOSYS;
- goto fail;
+ goto release_buf;
}
/*
* re-read the superblock so the buffer is correctly sized.
*/
if (sector_size < mp->m_sb.sb_sectsize) {
- XFS_BUF_UNMANAGE(bp);
xfs_buf_relse(bp);
sector_size = mp->m_sb.sb_sectsize;
- bp = xfs_buf_read(mp->m_ddev_targp, XFS_SB_DADDR,
- BTOBB(sector_size), extra_flags);
- if (!bp || XFS_BUF_ISERROR(bp)) {
- xfs_fs_mount_cmn_err(flags, "SB re-read failed");
- error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
- goto fail;
- }
- ASSERT(XFS_BUF_ISBUSY(bp));
- ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
+ goto reread;
}
/* Initialize per-cpu counters */
xfs_icsb_reinit_counters(mp);
mp->m_sb_bp = bp;
- xfs_buf_relse(bp);
- ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
+ xfs_buf_unlock(bp);
return 0;
- fail:
- if (bp) {
- XFS_BUF_UNMANAGE(bp);
- xfs_buf_relse(bp);
- }
+release_buf:
+ xfs_buf_relse(bp);
return error;
}
{
xfs_buf_t *bp;
xfs_daddr_t d;
- int error;
d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
- cmn_err(CE_WARN, "XFS: size check 1 failed");
+ cmn_err(CE_WARN, "XFS: filesystem size mismatch detected");
return XFS_ERROR(EFBIG);
}
- error = xfs_read_buf(mp, mp->m_ddev_targp,
- d - XFS_FSS_TO_BB(mp, 1),
- XFS_FSS_TO_BB(mp, 1), 0, &bp);
- if (!error) {
- xfs_buf_relse(bp);
- } else {
- cmn_err(CE_WARN, "XFS: size check 2 failed");
- if (error == ENOSPC)
- error = XFS_ERROR(EFBIG);
- return error;
+ bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
+ d - XFS_FSS_TO_BB(mp, 1),
+ BBTOB(XFS_FSS_TO_BB(mp, 1)), 0);
+ if (!bp) {
+ cmn_err(CE_WARN, "XFS: last sector read failed");
+ return EIO;
}
+ xfs_buf_relse(bp);
if (mp->m_logdev_targp != mp->m_ddev_targp) {
d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
- cmn_err(CE_WARN, "XFS: size check 3 failed");
+ cmn_err(CE_WARN, "XFS: log size mismatch detected");
return XFS_ERROR(EFBIG);
}
- error = xfs_read_buf(mp, mp->m_logdev_targp,
- d - XFS_FSB_TO_BB(mp, 1),
- XFS_FSB_TO_BB(mp, 1), 0, &bp);
- if (!error) {
- xfs_buf_relse(bp);
- } else {
- cmn_err(CE_WARN, "XFS: size check 3 failed");
- if (error == ENOSPC)
- error = XFS_ERROR(EFBIG);
- return error;
+ bp = xfs_buf_read_uncached(mp, mp->m_logdev_targp,
+ d - XFS_FSB_TO_BB(mp, 1),
+ XFS_FSB_TO_B(mp, 1), 0);
+ if (!bp) {
+ cmn_err(CE_WARN, "XFS: log device read failed");
+ return EIO;
}
+ xfs_buf_relse(bp);
}
return 0;
}
*/
int
xfs_mod_incore_sb(
- xfs_mount_t *mp,
- xfs_sb_field_t field,
- int64_t delta,
- int rsvd)
+ struct xfs_mount *mp,
+ xfs_sb_field_t field,
+ int64_t delta,
+ int rsvd)
{
- int status;
+ int status;
- /* check for per-cpu counters */
- switch (field) {
#ifdef HAVE_PERCPU_SB
- case XFS_SBS_ICOUNT:
- case XFS_SBS_IFREE:
- case XFS_SBS_FDBLOCKS:
- if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
- status = xfs_icsb_modify_counters(mp, field,
- delta, rsvd);
- break;
- }
- /* FALLTHROUGH */
+ ASSERT(field < XFS_SBS_ICOUNT || field > XFS_SBS_FDBLOCKS);
#endif
- default:
- spin_lock(&mp->m_sb_lock);
- status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
- spin_unlock(&mp->m_sb_lock);
- break;
- }
+ spin_lock(&mp->m_sb_lock);
+ status = xfs_mod_incore_sb_unlocked(mp, field, delta, rsvd);
+ spin_unlock(&mp->m_sb_lock);
return status;
}
case XFS_SBS_ICOUNT:
case XFS_SBS_IFREE:
case XFS_SBS_FDBLOCKS:
- if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
- spin_unlock(&mp->m_sb_lock);
- status = xfs_icsb_modify_counters(mp,
- msbp->msb_field,
- msbp->msb_delta, rsvd);
- spin_lock(&mp->m_sb_lock);
- break;
- }
- /* FALLTHROUGH */
+ spin_unlock(&mp->m_sb_lock);
+ status = xfs_icsb_modify_counters(mp,
+ msbp->msb_field,
+ msbp->msb_delta, rsvd);
+ spin_lock(&mp->m_sb_lock);
+ break;
#endif
default:
status = xfs_mod_incore_sb_unlocked(mp,
case XFS_SBS_ICOUNT:
case XFS_SBS_IFREE:
case XFS_SBS_FDBLOCKS:
- if (!(mp->m_flags & XFS_MOUNT_NO_PERCPU_SB)) {
- spin_unlock(&mp->m_sb_lock);
- status = xfs_icsb_modify_counters(mp,
- msbp->msb_field,
- -(msbp->msb_delta),
- rsvd);
- spin_lock(&mp->m_sb_lock);
- break;
- }
- /* FALLTHROUGH */
+ spin_unlock(&mp->m_sb_lock);
+ status = xfs_icsb_modify_counters(mp,
+ msbp->msb_field,
+ -(msbp->msb_delta),
+ rsvd);
+ spin_lock(&mp->m_sb_lock);
+ break;
#endif
default:
status = xfs_mod_incore_sb_unlocked(mp,
*/
void
xfs_freesb(
- xfs_mount_t *mp)
+ struct xfs_mount *mp)
{
- xfs_buf_t *bp;
+ struct xfs_buf *bp = mp->m_sb_bp;
- /*
- * Use xfs_getsb() so that the buffer will be locked
- * when we call xfs_buf_relse().
- */
- bp = xfs_getsb(mp, 0);
- XFS_BUF_UNMANAGE(bp);
- xfs_buf_relse(bp);
+ xfs_buf_lock(bp);
mp->m_sb_bp = NULL;
+ xfs_buf_relse(bp);
}
/*