From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Separate the "clear reflink flag" function into one function that checks
if the flag is needed, and a second function that checks and clears the
flag. The inode scrub code will want to check the necessity of the flag
without clearing it.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
fs/xfs/xfs_reflink.c | 88 ++++++++++++++++++++++++++++++--------------------
fs/xfs/xfs_reflink.h | 2 +
2 files changed, 54 insertions(+), 36 deletions(-)
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index e25c995..133ee02 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -1406,57 +1406,73 @@ xfs_reflink_dirty_extents(
return error;
}
-/* Clear the inode reflink flag if there are no shared extents. */
+/* Does this inode need the reflink flag? */
int
-xfs_reflink_clear_inode_flag(
- struct xfs_inode *ip,
- struct xfs_trans **tpp)
+xfs_reflink_needs_inode_flag(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ bool *needs_flag)
{
- struct xfs_mount *mp = ip->i_mount;
- xfs_fileoff_t fbno;
- xfs_filblks_t end;
- xfs_agnumber_t agno;
- xfs_agblock_t agbno;
- xfs_extlen_t aglen;
- xfs_agblock_t rbno;
- xfs_extlen_t rlen;
- struct xfs_bmbt_irec map;
- int nmaps;
- int error = 0;
-
- ASSERT(xfs_is_reflink_inode(ip));
+ struct xfs_bmbt_irec got;
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_ifork *ifp;
+ xfs_agnumber_t agno;
+ xfs_agblock_t agbno;
+ xfs_extlen_t aglen;
+ xfs_agblock_t rbno;
+ xfs_extlen_t rlen;
+ xfs_extnum_t idx;
+ bool found;
+ int error;
- fbno = 0;
- end = XFS_B_TO_FSB(mp, i_size_read(VFS_I(ip)));
- while (end - fbno > 0) {
- nmaps = 1;
- /*
- * Look for extents in the file. Skip holes, delalloc, or
- * unwritten extents; they can't be reflinked.
- */
- error = xfs_bmapi_read(ip, fbno, end - fbno, &map, &nmaps, 0);
+ ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ if (!(ifp->if_flags & XFS_IFEXTENTS)) {
+ error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
if (error)
return error;
- if (nmaps == 0)
- break;
- if (!xfs_bmap_is_real_extent(&map))
- goto next;
+ }
- agno = XFS_FSB_TO_AGNO(mp, map.br_startblock);
- agbno = XFS_FSB_TO_AGBNO(mp, map.br_startblock);
- aglen = map.br_blockcount;
+ *needs_flag = false;
+ found = xfs_iext_lookup_extent(ip, ifp, 0, &idx, &got);
+ while (found) {
+ if (isnullstartblock(got.br_startblock) ||
+ got.br_state != XFS_EXT_NORM)
+ goto next;
+ agno = XFS_FSB_TO_AGNO(mp, got.br_startblock);
+ agbno = XFS_FSB_TO_AGBNO(mp, got.br_startblock);
+ aglen = got.br_blockcount;
- error = xfs_reflink_find_shared(mp, *tpp, agno, agbno, aglen,
+ error = xfs_reflink_find_shared(mp, tp, agno, agbno, aglen,
&rbno, &rlen, false);
if (error)
return error;
/* Is there still a shared block here? */
- if (rbno != NULLAGBLOCK)
+ if (rbno != NULLAGBLOCK) {
+ *needs_flag = true;
return 0;
+ }
next:
- fbno = map.br_startoff + map.br_blockcount;
+ found = xfs_iext_get_extent(ifp, ++idx, &got);
}
+ return 0;
+}
+
+/* Clear the inode reflink flag if there are no shared extents. */
+int
+xfs_reflink_clear_inode_flag(
+ struct xfs_inode *ip,
+ struct xfs_trans **tpp)
+{
+ bool needs;
+ int error = 0;
+
+ ASSERT(xfs_is_reflink_inode(ip));
+
+ error = xfs_reflink_needs_inode_flag(*tpp, ip, &needs);
+ if (error || needs)
+ return error;
+
/*
* We didn't find any shared blocks so turn off the reflink flag.
* First, get rid of any leftover CoW mappings.
diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h
index b8cc5c3..a26d795 100644
--- a/fs/xfs/xfs_reflink.h
+++ b/fs/xfs/xfs_reflink.h
@@ -47,6 +47,8 @@ extern int xfs_reflink_end_cow(struct xfs_inode *ip, xfs_off_t offset,
extern int xfs_reflink_recover_cow(struct xfs_mount *mp);
extern int xfs_reflink_remap_range(struct file *file_in, loff_t pos_in,
struct file *file_out, loff_t pos_out, u64 len, bool is_dedupe);
+extern int xfs_reflink_needs_inode_flag(struct xfs_trans *tp,
+ struct xfs_inode *ip, bool *needs_flag);
extern int xfs_reflink_clear_inode_flag(struct xfs_inode *ip,
struct xfs_trans **tpp);
extern int xfs_reflink_unshare(struct xfs_inode *ip, xfs_off_t offset,
--
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