xfs: introduce xfs_bulkstat_grab_ichunk
From: Jie Liu <jeff.liu@oracle.com>
Introduce xfs_bulkstat_grab_ichunk() to look up an inode chunk in where
the given inode resides, then grab the record. Update the data for the
pointed-to record if the inode was not the last in the chunk and there
are some left allocated, return the grabbed inode count on success.
Refactor xfs_bulkstat() with it.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index b508167..32cf52e 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -203,6 +203,63 @@
blk_finish_plug(&plug);
}
+/*
+ * Lookup the inode chunk that the given inode lives in and then get the record
+ * if we found the chunk. If the inode was not the last in the chunk and there
+ * are some left allocated, update the data for the pointed-to record as well as
+ * return the count of grabbed inodes.
+ */
+STATIC int
+xfs_bulkstat_grab_ichunk(
+ struct xfs_btree_cur *cur, /* btree cursor */
+ xfs_agino_t agino, /* starting inode of chunk */
+ int *icount,/* return # of inodes grabbed */
+ struct xfs_inobt_rec_incore *irec) /* btree record */
+{
+ int idx; /* index into inode chunk */
+ int stat;
+ int error = 0;
+
+ /* Lookup the inode chunk that this inode lives in */
+ error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &stat);
+ if (error)
+ return error;
+ if (!stat) {
+ *icount = 0;
+ return error;
+ }
+
+ /* Get the record, should always work */
+ error = xfs_inobt_get_rec(cur, irec, &stat);
+ if (error)
+ return error;
+ XFS_WANT_CORRUPTED_RETURN(stat == 1);
+
+ /* Check if the record contains the inode in request */
+ if (irec->ir_startino + XFS_INODES_PER_CHUNK <= agino)
+ return -EINVAL;
+
+ idx = agino - irec->ir_startino + 1;
+ if (idx < XFS_INODES_PER_CHUNK &&
+ (xfs_inobt_maskn(idx, XFS_INODES_PER_CHUNK - idx) & ~irec->ir_free)) {
+ int i;
+
+ /* We got a right chunk with some left inodes allocated at it.
+ * Grab the chunk record. Mark all the uninteresting inodes
+ * free -- because they're before our start point.
+ */
+ for (i = 0; i < idx; i++) {
+ if (XFS_INOBT_MASK(i) & ~irec->ir_free)
+ irec->ir_freecount++;
+ }
+
+ irec->ir_free |= xfs_inobt_maskn(0, idx);
+ *icount = XFS_INODES_PER_CHUNK - irec->ir_freecount;
+ }
+
+ return 0;
+}
+
#define XFS_BULKSTAT_UBLEFT(ubleft) ((ubleft) >= statstruct_size)
/*
@@ -290,67 +347,29 @@
irbp = irbuf;
irbufend = irbuf + nirbuf;
end_of_ag = 0;
- /*
- * If we're returning in the middle of an allocation group,
- * we need to get the remainder of the chunk we're in.
- */
+ icount = 0;
if (agino > 0) {
- xfs_inobt_rec_incore_t r;
-
/*
- * Lookup the inode chunk that this inode lives in.
+ * In the middle of an allocation group, we need to get
+ * the remainder of the chunk we're in.
*/
- error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE,
- &tmp);
- if (!error && /* no I/O error */
- tmp && /* lookup succeeded */
- /* got the record, should always work */
- !(error = xfs_inobt_get_rec(cur, &r, &i)) &&
- i == 1 &&
- /* this is the right chunk */
- agino < r.ir_startino + XFS_INODES_PER_CHUNK &&
- /* lastino was not last in chunk */
- (chunkidx = agino - r.ir_startino + 1) <
- XFS_INODES_PER_CHUNK &&
- /* there are some left allocated */
- xfs_inobt_maskn(chunkidx,
- XFS_INODES_PER_CHUNK - chunkidx) &
- ~r.ir_free) {
- /*
- * Grab the chunk record. Mark all the
- * uninteresting inodes (because they're
- * before our start point) free.
- */
- for (i = 0; i < chunkidx; i++) {
- if (XFS_INOBT_MASK(i) & ~r.ir_free)
- r.ir_freecount++;
- }
- r.ir_free |= xfs_inobt_maskn(0, chunkidx);
+ struct xfs_inobt_rec_incore r;
+
+ error = xfs_bulkstat_grab_ichunk(cur, agino, &icount, &r);
+ if (error)
+ break;
+ if (icount) {
irbp->ir_startino = r.ir_startino;
irbp->ir_freecount = r.ir_freecount;
irbp->ir_free = r.ir_free;
irbp++;
agino = r.ir_startino + XFS_INODES_PER_CHUNK;
- icount = XFS_INODES_PER_CHUNK - r.ir_freecount;
- } else {
- /*
- * If any of those tests failed, bump the
- * inode number (just in case).
- */
- agino++;
- icount = 0;
}
- /*
- * In any case, increment to the next record.
- */
- if (!error)
- error = xfs_btree_increment(cur, 0, &tmp);
+ /* Increment to the next record */
+ error = xfs_btree_increment(cur, 0, &tmp);
} else {
- /*
- * Start of ag. Lookup the first inode chunk.
- */
+ /* Start of ag. Lookup the first inode chunk */
error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &tmp);
- icount = 0;
}
if (error)
break;