linux-kernel - [PATCH 3.19.y-ckt 148/251] ext4: don't retry file block mapping on bigalloc fs with non-extent file

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Message-Id: <1437008972-9140-149-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:07:49 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"Darrick J. Wong" <darrick.wong@...cle.com>,
	Theodore Ts'o <tytso@....edu>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 148/251] ext4: don't retry file block mapping on bigalloc fs with non-extent file

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Darrick J. Wong" <darrick.wong@...cle.com>

commit 292db1bc6c105d86111e858859456bcb11f90f91 upstream.

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>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Kamal Mostafa <kamal@...onical.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 5e7af1c..1136888 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 */
-- 
1.9.1

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