#include <linux/iversion.h>
+static int xfs_inode_walk(struct xfs_mount *mp, int iter_flags,
+ int (*execute)(struct xfs_inode *ip, void *args),
+ void *args, int tag);
+static int xfs_inode_walk_ag(struct xfs_perag *pag, int iter_flags,
+ int (*execute)(struct xfs_inode *ip, void *args),
+ void *args, int tag);
+
/*
* Private inode cache walk flags for struct xfs_eofblocks. Must not coincide
* with XFS_EOF_FLAGS_*.
* radix tree lookups to a minimum. The batch size is a trade off between
* lookup reduction and stack usage. This is in the reclaim path, so we can't
* be too greedy.
+ *
+ * XXX: This will be moved closer to xfs_inode_walk* once we get rid of the
+ * separate reclaim walk functions.
*/
#define XFS_LOOKUP_BATCH 32
-/*
- * Decide if the given @ip is eligible to be a part of the inode walk, and
- * grab it if so. Returns true if it's ready to go or false if we should just
- * ignore it.
- */
-STATIC bool
-xfs_inode_walk_ag_grab(
- struct xfs_inode *ip,
- int flags)
-{
- struct inode *inode = VFS_I(ip);
- bool newinos = !!(flags & XFS_INODE_WALK_INEW_WAIT);
-
- ASSERT(rcu_read_lock_held());
-
- /* Check for stale RCU freed inode */
- spin_lock(&ip->i_flags_lock);
- if (!ip->i_ino)
- goto out_unlock_noent;
-
- /* avoid new or reclaimable inodes. Leave for reclaim code to flush */
- if ((!newinos && __xfs_iflags_test(ip, XFS_INEW)) ||
- __xfs_iflags_test(ip, XFS_IRECLAIMABLE | XFS_IRECLAIM))
- goto out_unlock_noent;
- spin_unlock(&ip->i_flags_lock);
-
- /* nothing to sync during shutdown */
- if (XFS_FORCED_SHUTDOWN(ip->i_mount))
- return false;
-
- /* If we can't grab the inode, it must on it's way to reclaim. */
- if (!igrab(inode))
- return false;
-
- /* inode is valid */
- return true;
-
-out_unlock_noent:
- spin_unlock(&ip->i_flags_lock);
- return false;
-}
-
-/*
- * For a given per-AG structure @pag, grab, @execute, and rele all incore
- * inodes with the given radix tree @tag.
- */
-STATIC int
-xfs_inode_walk_ag(
- struct xfs_perag *pag,
- int iter_flags,
- int (*execute)(struct xfs_inode *ip, void *args),
- void *args,
- int tag)
-{
- struct xfs_mount *mp = pag->pag_mount;
- uint32_t first_index;
- int last_error = 0;
- int skipped;
- bool done;
- int nr_found;
-
-restart:
- done = false;
- skipped = 0;
- first_index = 0;
- nr_found = 0;
- do {
- struct xfs_inode *batch[XFS_LOOKUP_BATCH];
- int error = 0;
- int i;
-
- rcu_read_lock();
-
- if (tag == XFS_ICI_NO_TAG)
- nr_found = radix_tree_gang_lookup(&pag->pag_ici_root,
- (void **)batch, first_index,
- XFS_LOOKUP_BATCH);
- else
- nr_found = radix_tree_gang_lookup_tag(
- &pag->pag_ici_root,
- (void **) batch, first_index,
- XFS_LOOKUP_BATCH, tag);
-
- if (!nr_found) {
- rcu_read_unlock();
- break;
- }
-
- /*
- * Grab the inodes before we drop the lock. if we found
- * nothing, nr == 0 and the loop will be skipped.
- */
- for (i = 0; i < nr_found; i++) {
- struct xfs_inode *ip = batch[i];
-
- if (done || !xfs_inode_walk_ag_grab(ip, iter_flags))
- batch[i] = NULL;
-
- /*
- * Update the index for the next lookup. Catch
- * overflows into the next AG range which can occur if
- * we have inodes in the last block of the AG and we
- * are currently pointing to the last inode.
- *
- * Because we may see inodes that are from the wrong AG
- * due to RCU freeing and reallocation, only update the
- * index if it lies in this AG. It was a race that lead
- * us to see this inode, so another lookup from the
- * same index will not find it again.
- */
- if (XFS_INO_TO_AGNO(mp, ip->i_ino) != pag->pag_agno)
- continue;
- first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);
- if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino))
- done = true;
- }
-
- /* unlock now we've grabbed the inodes. */
- rcu_read_unlock();
-
- for (i = 0; i < nr_found; i++) {
- if (!batch[i])
- continue;
- if ((iter_flags & XFS_INODE_WALK_INEW_WAIT) &&
- xfs_iflags_test(batch[i], XFS_INEW))
- xfs_inew_wait(batch[i]);
- error = execute(batch[i], args);
- xfs_irele(batch[i]);
- if (error == -EAGAIN) {
- skipped++;
- continue;
- }
- if (error && last_error != -EFSCORRUPTED)
- last_error = error;
- }
-
- /* bail out if the filesystem is corrupted. */
- if (error == -EFSCORRUPTED)
- break;
-
- cond_resched();
-
- } while (nr_found && !done);
-
- if (skipped) {
- delay(1);
- goto restart;
- }
- return last_error;
-}
-
-/* Fetch the next (possibly tagged) per-AG structure. */
-static inline struct xfs_perag *
-xfs_inode_walk_get_perag(
- struct xfs_mount *mp,
- xfs_agnumber_t agno,
- int tag)
-{
- if (tag == XFS_ICI_NO_TAG)
- return xfs_perag_get(mp, agno);
- return xfs_perag_get_tag(mp, agno, tag);
-}
-
-/*
- * Call the @execute function on all incore inodes matching the radix tree
- * @tag.
- */
-static int
-xfs_inode_walk(
- struct xfs_mount *mp,
- int iter_flags,
- int (*execute)(struct xfs_inode *ip, void *args),
- void *args,
- int tag)
-{
- struct xfs_perag *pag;
- int error = 0;
- int last_error = 0;
- xfs_agnumber_t ag;
-
- ag = 0;
- while ((pag = xfs_inode_walk_get_perag(mp, ag, tag))) {
- ag = pag->pag_agno + 1;
- error = xfs_inode_walk_ag(pag, iter_flags, execute, args, tag);
- xfs_perag_put(pag);
- if (error) {
- last_error = error;
- if (error == -EFSCORRUPTED)
- break;
- }
- }
- return last_error;
- BUILD_BUG_ON(XFS_ICWALK_PRIVATE_FLAGS & XFS_EOF_FLAGS_VALID);
-}
-
#ifdef CONFIG_XFS_QUOTA
/* Drop this inode's dquots. */
static int
xfs_blockgc_queue(pag);
}
+/*
+ * Decide if the given @ip is eligible to be a part of the inode walk, and
+ * grab it if so. Returns true if it's ready to go or false if we should just
+ * ignore it.
+ */
+static bool
+xfs_inode_walk_ag_grab(
+ struct xfs_inode *ip,
+ int flags)
+{
+ struct inode *inode = VFS_I(ip);
+ bool newinos = !!(flags & XFS_INODE_WALK_INEW_WAIT);
+
+ ASSERT(rcu_read_lock_held());
+
+ /* Check for stale RCU freed inode */
+ spin_lock(&ip->i_flags_lock);
+ if (!ip->i_ino)
+ goto out_unlock_noent;
+
+ /* avoid new or reclaimable inodes. Leave for reclaim code to flush */
+ if ((!newinos && __xfs_iflags_test(ip, XFS_INEW)) ||
+ __xfs_iflags_test(ip, XFS_IRECLAIMABLE | XFS_IRECLAIM))
+ goto out_unlock_noent;
+ spin_unlock(&ip->i_flags_lock);
+
+ /* nothing to sync during shutdown */
+ if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+ return false;
+
+ /* If we can't grab the inode, it must on it's way to reclaim. */
+ if (!igrab(inode))
+ return false;
+
+ /* inode is valid */
+ return true;
+
+out_unlock_noent:
+ spin_unlock(&ip->i_flags_lock);
+ return false;
+}
+
/* Scan one incore inode for block preallocations that we can remove. */
static int
xfs_blockgc_scan_inode(
xfs_inode_dquot(ip, XFS_DQTYPE_GROUP),
xfs_inode_dquot(ip, XFS_DQTYPE_PROJ), eof_flags);
}
+
+/* XFS Inode Cache Walking Code */
+
+/*
+ * For a given per-AG structure @pag, grab, @execute, and rele all incore
+ * inodes with the given radix tree @tag.
+ */
+static int
+xfs_inode_walk_ag(
+ struct xfs_perag *pag,
+ int iter_flags,
+ int (*execute)(struct xfs_inode *ip, void *args),
+ void *args,
+ int tag)
+{
+ struct xfs_mount *mp = pag->pag_mount;
+ uint32_t first_index;
+ int last_error = 0;
+ int skipped;
+ bool done;
+ int nr_found;
+
+restart:
+ done = false;
+ skipped = 0;
+ first_index = 0;
+ nr_found = 0;
+ do {
+ struct xfs_inode *batch[XFS_LOOKUP_BATCH];
+ int error = 0;
+ int i;
+
+ rcu_read_lock();
+
+ if (tag == XFS_ICI_NO_TAG)
+ nr_found = radix_tree_gang_lookup(&pag->pag_ici_root,
+ (void **)batch, first_index,
+ XFS_LOOKUP_BATCH);
+ else
+ nr_found = radix_tree_gang_lookup_tag(
+ &pag->pag_ici_root,
+ (void **) batch, first_index,
+ XFS_LOOKUP_BATCH, tag);
+
+ if (!nr_found) {
+ rcu_read_unlock();
+ break;
+ }
+
+ /*
+ * Grab the inodes before we drop the lock. if we found
+ * nothing, nr == 0 and the loop will be skipped.
+ */
+ for (i = 0; i < nr_found; i++) {
+ struct xfs_inode *ip = batch[i];
+
+ if (done || !xfs_inode_walk_ag_grab(ip, iter_flags))
+ batch[i] = NULL;
+
+ /*
+ * Update the index for the next lookup. Catch
+ * overflows into the next AG range which can occur if
+ * we have inodes in the last block of the AG and we
+ * are currently pointing to the last inode.
+ *
+ * Because we may see inodes that are from the wrong AG
+ * due to RCU freeing and reallocation, only update the
+ * index if it lies in this AG. It was a race that lead
+ * us to see this inode, so another lookup from the
+ * same index will not find it again.
+ */
+ if (XFS_INO_TO_AGNO(mp, ip->i_ino) != pag->pag_agno)
+ continue;
+ first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);
+ if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino))
+ done = true;
+ }
+
+ /* unlock now we've grabbed the inodes. */
+ rcu_read_unlock();
+
+ for (i = 0; i < nr_found; i++) {
+ if (!batch[i])
+ continue;
+ if ((iter_flags & XFS_INODE_WALK_INEW_WAIT) &&
+ xfs_iflags_test(batch[i], XFS_INEW))
+ xfs_inew_wait(batch[i]);
+ error = execute(batch[i], args);
+ xfs_irele(batch[i]);
+ if (error == -EAGAIN) {
+ skipped++;
+ continue;
+ }
+ if (error && last_error != -EFSCORRUPTED)
+ last_error = error;
+ }
+
+ /* bail out if the filesystem is corrupted. */
+ if (error == -EFSCORRUPTED)
+ break;
+
+ cond_resched();
+
+ } while (nr_found && !done);
+
+ if (skipped) {
+ delay(1);
+ goto restart;
+ }
+ return last_error;
+}
+
+/* Fetch the next (possibly tagged) per-AG structure. */
+static inline struct xfs_perag *
+xfs_inode_walk_get_perag(
+ struct xfs_mount *mp,
+ xfs_agnumber_t agno,
+ int tag)
+{
+ if (tag == XFS_ICI_NO_TAG)
+ return xfs_perag_get(mp, agno);
+ return xfs_perag_get_tag(mp, agno, tag);
+}
+
+/*
+ * Call the @execute function on all incore inodes matching the radix tree
+ * @tag.
+ */
+static int
+xfs_inode_walk(
+ struct xfs_mount *mp,
+ int iter_flags,
+ int (*execute)(struct xfs_inode *ip, void *args),
+ void *args,
+ int tag)
+{
+ struct xfs_perag *pag;
+ int error = 0;
+ int last_error = 0;
+ xfs_agnumber_t agno = 0;
+
+ while ((pag = xfs_inode_walk_get_perag(mp, agno, tag))) {
+ agno = pag->pag_agno + 1;
+ error = xfs_inode_walk_ag(pag, iter_flags, execute, args, tag);
+ xfs_perag_put(pag);
+ if (error) {
+ last_error = error;
+ if (error == -EFSCORRUPTED)
+ break;
+ }
+ }
+ return last_error;
+ BUILD_BUG_ON(XFS_ICWALK_PRIVATE_FLAGS & XFS_EOF_FLAGS_VALID);
+}
projects / linux-2.6-microblaze.git / commitdiff