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authorLinus Torvalds <torvalds@linux-foundation.org>2022-08-13 13:50:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2022-08-13 13:50:11 -0700
commit9872e4a8734c68b78e8782e4f7f49e22cd6e9463 (patch)
tree8e2fec94ae39a76e617adb032c8ac7ff607f2dde /fs/xfs/xfs_reflink.c
parente140f731f9807035e967c401198171f316744696 (diff)
parent031d166f968efba6e4f091ff75d0bb5206bb3918 (diff)
Merge tag 'xfs-5.20-merge-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull more xfs updates from Darrick Wong: "There's not a lot this time around, just the usual bug fixes and corrections for missing error returns. - Return error codes from block device flushes to userspace - Fix a deadlock between reclaim and mount time quotacheck - Fix an unnecessary ENOSPC return when doing COW on a filesystem with severe free space fragmentation - Fix a miscalculation in the transaction reservation computations for file removal operations" * tag 'xfs-5.20-merge-8' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: xfs: fix inode reservation space for removing transaction xfs: Fix false ENOSPC when performing direct write on a delalloc extent in cow fork xfs: fix intermittent hang during quotacheck xfs: check return codes when flushing block devices
Diffstat (limited to 'fs/xfs/xfs_reflink.c')
-rw-r--r--fs/xfs/xfs_reflink.c198
1 files changed, 163 insertions, 35 deletions
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index e17a84e8b527..251f20ddd368 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -341,9 +341,41 @@ xfs_find_trim_cow_extent(
return 0;
}
-/* Allocate all CoW reservations covering a range of blocks in a file. */
-int
-xfs_reflink_allocate_cow(
+static int
+xfs_reflink_convert_unwritten(
+ struct xfs_inode *ip,
+ struct xfs_bmbt_irec *imap,
+ struct xfs_bmbt_irec *cmap,
+ bool convert_now)
+{
+ xfs_fileoff_t offset_fsb = imap->br_startoff;
+ xfs_filblks_t count_fsb = imap->br_blockcount;
+ int error;
+
+ /*
+ * cmap might larger than imap due to cowextsize hint.
+ */
+ xfs_trim_extent(cmap, offset_fsb, count_fsb);
+
+ /*
+ * COW fork extents are supposed to remain unwritten until we're ready
+ * to initiate a disk write. For direct I/O we are going to write the
+ * data and need the conversion, but for buffered writes we're done.
+ */
+ if (!convert_now || cmap->br_state == XFS_EXT_NORM)
+ return 0;
+
+ trace_xfs_reflink_convert_cow(ip, cmap);
+
+ error = xfs_reflink_convert_cow_locked(ip, offset_fsb, count_fsb);
+ if (!error)
+ cmap->br_state = XFS_EXT_NORM;
+
+ return error;
+}
+
+static int
+xfs_reflink_fill_cow_hole(
struct xfs_inode *ip,
struct xfs_bmbt_irec *imap,
struct xfs_bmbt_irec *cmap,
@@ -352,25 +384,12 @@ xfs_reflink_allocate_cow(
bool convert_now)
{
struct xfs_mount *mp = ip->i_mount;
- xfs_fileoff_t offset_fsb = imap->br_startoff;
- xfs_filblks_t count_fsb = imap->br_blockcount;
struct xfs_trans *tp;
- int nimaps, error = 0;
- bool found;
xfs_filblks_t resaligned;
- xfs_extlen_t resblks = 0;
-
- ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
- if (!ip->i_cowfp) {
- ASSERT(!xfs_is_reflink_inode(ip));
- xfs_ifork_init_cow(ip);
- }
-
- error = xfs_find_trim_cow_extent(ip, imap, cmap, shared, &found);
- if (error || !*shared)
- return error;
- if (found)
- goto convert;
+ xfs_extlen_t resblks;
+ int nimaps;
+ int error;
+ bool found;
resaligned = xfs_aligned_fsb_count(imap->br_startoff,
imap->br_blockcount, xfs_get_cowextsz_hint(ip));
@@ -386,17 +405,17 @@ xfs_reflink_allocate_cow(
*lockmode = XFS_ILOCK_EXCL;
- /*
- * Check for an overlapping extent again now that we dropped the ilock.
- */
error = xfs_find_trim_cow_extent(ip, imap, cmap, shared, &found);
if (error || !*shared)
goto out_trans_cancel;
+
if (found) {
xfs_trans_cancel(tp);
goto convert;
}
+ ASSERT(cmap->br_startoff > imap->br_startoff);
+
/* Allocate the entire reservation as unwritten blocks. */
nimaps = 1;
error = xfs_bmapi_write(tp, ip, imap->br_startoff, imap->br_blockcount,
@@ -416,26 +435,135 @@ xfs_reflink_allocate_cow(
*/
if (nimaps == 0)
return -ENOSPC;
+
convert:
- xfs_trim_extent(cmap, offset_fsb, count_fsb);
- /*
- * COW fork extents are supposed to remain unwritten until we're ready
- * to initiate a disk write. For direct I/O we are going to write the
- * data and need the conversion, but for buffered writes we're done.
- */
- if (!convert_now || cmap->br_state == XFS_EXT_NORM)
- return 0;
- trace_xfs_reflink_convert_cow(ip, cmap);
- error = xfs_reflink_convert_cow_locked(ip, offset_fsb, count_fsb);
- if (!error)
- cmap->br_state = XFS_EXT_NORM;
+ return xfs_reflink_convert_unwritten(ip, imap, cmap, convert_now);
+
+out_trans_cancel:
+ xfs_trans_cancel(tp);
return error;
+}
+
+static int
+xfs_reflink_fill_delalloc(
+ struct xfs_inode *ip,
+ struct xfs_bmbt_irec *imap,
+ struct xfs_bmbt_irec *cmap,
+ bool *shared,
+ uint *lockmode,
+ bool convert_now)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_trans *tp;
+ int nimaps;
+ int error;
+ bool found;
+
+ do {
+ xfs_iunlock(ip, *lockmode);
+ *lockmode = 0;
+
+ error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_write, 0, 0,
+ false, &tp);
+ if (error)
+ return error;
+
+ *lockmode = XFS_ILOCK_EXCL;
+
+ error = xfs_find_trim_cow_extent(ip, imap, cmap, shared,
+ &found);
+ if (error || !*shared)
+ goto out_trans_cancel;
+
+ if (found) {
+ xfs_trans_cancel(tp);
+ break;
+ }
+
+ ASSERT(isnullstartblock(cmap->br_startblock) ||
+ cmap->br_startblock == DELAYSTARTBLOCK);
+
+ /*
+ * Replace delalloc reservation with an unwritten extent.
+ */
+ nimaps = 1;
+ error = xfs_bmapi_write(tp, ip, cmap->br_startoff,
+ cmap->br_blockcount,
+ XFS_BMAPI_COWFORK | XFS_BMAPI_PREALLOC, 0,
+ cmap, &nimaps);
+ if (error)
+ goto out_trans_cancel;
+
+ xfs_inode_set_cowblocks_tag(ip);
+ error = xfs_trans_commit(tp);
+ if (error)
+ return error;
+
+ /*
+ * Allocation succeeded but the requested range was not even
+ * partially satisfied? Bail out!
+ */
+ if (nimaps == 0)
+ return -ENOSPC;
+ } while (cmap->br_startoff + cmap->br_blockcount <= imap->br_startoff);
+
+ return xfs_reflink_convert_unwritten(ip, imap, cmap, convert_now);
out_trans_cancel:
xfs_trans_cancel(tp);
return error;
}
+/* Allocate all CoW reservations covering a range of blocks in a file. */
+int
+xfs_reflink_allocate_cow(
+ struct xfs_inode *ip,
+ struct xfs_bmbt_irec *imap,
+ struct xfs_bmbt_irec *cmap,
+ bool *shared,
+ uint *lockmode,
+ bool convert_now)
+{
+ int error;
+ bool found;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ if (!ip->i_cowfp) {
+ ASSERT(!xfs_is_reflink_inode(ip));
+ xfs_ifork_init_cow(ip);
+ }
+
+ error = xfs_find_trim_cow_extent(ip, imap, cmap, shared, &found);
+ if (error || !*shared)
+ return error;
+
+ /* CoW fork has a real extent */
+ if (found)
+ return xfs_reflink_convert_unwritten(ip, imap, cmap,
+ convert_now);
+
+ /*
+ * CoW fork does not have an extent and data extent is shared.
+ * Allocate a real extent in the CoW fork.
+ */
+ if (cmap->br_startoff > imap->br_startoff)
+ return xfs_reflink_fill_cow_hole(ip, imap, cmap, shared,
+ lockmode, convert_now);
+
+ /*
+ * CoW fork has a delalloc reservation. Replace it with a real extent.
+ * There may or may not be a data fork mapping.
+ */
+ if (isnullstartblock(cmap->br_startblock) ||
+ cmap->br_startblock == DELAYSTARTBLOCK)
+ return xfs_reflink_fill_delalloc(ip, imap, cmap, shared,
+ lockmode, convert_now);
+
+ /* Shouldn't get here. */
+ ASSERT(0);
+ return -EFSCORRUPTED;
+}
+
/*
* Cancel CoW reservations for some block range of an inode.
*