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authorDarrick J. Wong <djwong@kernel.org>2021-01-27 21:07:27 +0300
committerDarrick J. Wong <djwong@kernel.org>2021-02-03 20:18:49 +0300
commitf273387b048543f2b8b2d809cc65fca28e7788a1 (patch)
tree428b837d7a89c34ec313dc90b30fb4fd3d47066b
parent3de4eb106fcc97f086b78bd17a0c3529691e8259 (diff)
downloadlinux-f273387b048543f2b8b2d809cc65fca28e7788a1.tar.xz
xfs: refactor reflink functions to use xfs_trans_alloc_inode
The two remaining callers of xfs_trans_reserve_quota_nblks are in the reflink code. These conversions aren't as uniform as the previous conversions, so call that out in a separate patch. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
-rw-r--r--fs/xfs/xfs_iomap.c3
-rw-r--r--fs/xfs/xfs_reflink.c53
2 files changed, 23 insertions, 33 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index fe2bbd9b6fdb..70c341658c01 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -831,7 +831,8 @@ out_found_cow:
return xfs_bmbt_to_iomap(ip, iomap, &cmap, IOMAP_F_SHARED);
out_unlock:
- xfs_iunlock(ip, lockmode);
+ if (lockmode)
+ xfs_iunlock(ip, lockmode);
return error;
}
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 0778b5810c26..27f875fa7a0d 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -376,16 +376,14 @@ xfs_reflink_allocate_cow(
resblks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
xfs_iunlock(ip, *lockmode);
- error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);
- *lockmode = XFS_ILOCK_EXCL;
- xfs_ilock(ip, *lockmode);
+ *lockmode = 0;
+ error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, resblks, 0,
+ false, &tp);
if (error)
return error;
- error = xfs_qm_dqattach_locked(ip, false);
- if (error)
- goto out_trans_cancel;
+ *lockmode = XFS_ILOCK_EXCL;
/*
* Check for an overlapping extent again now that we dropped the ilock.
@@ -398,12 +396,6 @@ xfs_reflink_allocate_cow(
goto convert;
}
- error = xfs_trans_reserve_quota_nblks(tp, ip, resblks, 0, false);
- if (error)
- goto out_trans_cancel;
-
- xfs_trans_ijoin(tp, ip, 0);
-
/* Allocate the entire reservation as unwritten blocks. */
nimaps = 1;
error = xfs_bmapi_write(tp, ip, imap->br_startoff, imap->br_blockcount,
@@ -997,7 +989,7 @@ xfs_reflink_remap_extent(
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
xfs_off_t newlen;
- int64_t qres, qdelta;
+ int64_t qdelta = 0;
unsigned int resblks;
bool smap_real;
bool dmap_written = xfs_bmap_is_written_extent(dmap);
@@ -1005,15 +997,22 @@ xfs_reflink_remap_extent(
int nimaps;
int error;
- /* Start a rolling transaction to switch the mappings */
+ /*
+ * Start a rolling transaction to switch the mappings.
+ *
+ * Adding a written extent to the extent map can cause a bmbt split,
+ * and removing a mapped extent from the extent can cause a bmbt split.
+ * The two operations cannot both cause a split since they operate on
+ * the same index in the bmap btree, so we only need a reservation for
+ * one bmbt split if either thing is happening. However, we haven't
+ * locked the inode yet, so we reserve assuming this is the case.
+ */
resblks = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
- error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);
+ error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, resblks, 0,
+ false, &tp);
if (error)
goto out;
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- xfs_trans_ijoin(tp, ip, 0);
-
/*
* Read what's currently mapped in the destination file into smap.
* If smap isn't a hole, we will have to remove it before we can add
@@ -1061,15 +1060,9 @@ xfs_reflink_remap_extent(
}
/*
- * Compute quota reservation if we think the quota block counter for
+ * Increase quota reservation if we think the quota block counter for
* this file could increase.
*
- * Adding a written extent to the extent map can cause a bmbt split,
- * and removing a mapped extent from the extent can cause a bmbt split.
- * The two operations cannot both cause a split since they operate on
- * the same index in the bmap btree, so we only need a reservation for
- * one bmbt split if either thing is happening.
- *
* If we are mapping a written extent into the file, we need to have
* enough quota block count reservation to handle the blocks in that
* extent. We log only the delta to the quota block counts, so if the
@@ -1083,13 +1076,9 @@ xfs_reflink_remap_extent(
* before we started. That should have removed all the delalloc
* reservations, but we code defensively.
*/
- qres = qdelta = 0;
- if (smap_real || dmap_written)
- qres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
- if (!smap_real && dmap_written)
- qres += dmap->br_blockcount;
- if (qres > 0) {
- error = xfs_trans_reserve_quota_nblks(tp, ip, qres, 0, false);
+ if (!smap_real && dmap_written) {
+ error = xfs_trans_reserve_quota_nblks(tp, ip,
+ dmap->br_blockcount, 0, false);
if (error)
goto out_cancel;
}