diff options
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/xfs_aops.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index a6abb7125203..2ed8733eca49 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -334,7 +334,8 @@ xfs_imap_valid( * extent that maps offset_fsb in wpc->imap. * * The current page is held locked so nothing could have removed the block - * backing offset_fsb. + * backing offset_fsb, although it could have moved from the COW to the data + * fork by another thread. */ static int xfs_convert_blocks( @@ -375,6 +376,7 @@ xfs_map_blocks( xfs_fileoff_t cow_fsb = NULLFILEOFF; struct xfs_bmbt_irec imap; struct xfs_iext_cursor icur; + int retries = 0; int error = 0; if (XFS_FORCED_SHUTDOWN(mp)) @@ -404,6 +406,7 @@ xfs_map_blocks( * into real extents. If we return without a valid map, it means we * landed in a hole and we skip the block. */ +retry: xfs_ilock(ip, XFS_ILOCK_SHARED); ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE || (ip->i_df.if_flags & XFS_IFEXTENTS)); @@ -471,8 +474,19 @@ xfs_map_blocks( return 0; allocate_blocks: error = xfs_convert_blocks(wpc, ip, offset_fsb); - if (error) + if (error) { + /* + * If we failed to find the extent in the COW fork we might have + * raced with a COW to data fork conversion or truncate. + * Restart the lookup to catch the extent in the data fork for + * the former case, but prevent additional retries to avoid + * looping forever for the latter case. + */ + if (error == -EAGAIN && wpc->fork == XFS_COW_FORK && !retries++) + goto retry; + ASSERT(error != -EAGAIN); return error; + } /* * Due to merging the return real extent might be larger than the |