linux-ext4 - [PATCH] ext4: don't retry file block mapping on bigalloc fs with non-extent file

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Message-ID: <20150319212557.GG11031@birch.djwong.org>
Date:	Thu, 19 Mar 2015 14:25:57 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, linux-ext4@...r.kernel.org
Subject: [PATCH] ext4: don't retry file block mapping on bigalloc fs with
 non-extent file

ext4 isn't willing to map clusters to a non-extent file.  Don't signal
this with an out of space error, since the FS will retry the
allocation (which didn't fail) forever.  Instead, return EUCLEAN so
that the operation will fail immediately all the way back to userspace.

(The fix is either to run e2fsck -E bmap2extent, or to chattr +e the file.)

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 fs/ext4/indirect.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
index 45fe924..b46f2b2 100644
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -565,7 +565,7 @@ int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
 				       EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 		EXT4_ERROR_INODE(inode, "Can't allocate blocks for "
 				 "non-extent mapped inodes with bigalloc");
-		return -ENOSPC;
+		return -EUCLEAN;
 	}

 	/* Set up for the direct block allocation */
--
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