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authorEric Sandeen <sandeen@redhat.com>2011-08-11 09:54:31 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-15 18:31:42 -0700
commit8b180803c66ccc825d2969c1ea9929fcb7fba98e (patch)
tree52643c3a17c557c5a1a8f5abc5baf473be241285
parent1ae2a2c0515870d784f1ea101b079bd0962b6cd5 (diff)
downloadlinux-linaro-8b180803c66ccc825d2969c1ea9929fcb7fba98e.tar.gz
ext4: Properly count journal credits for long symlinks
commit 8c20871998c082f6fbc963f1449a5ba5140ee39a upstream. Commit df5e6223407e ("ext4: fix deadlock in ext4_symlink() in ENOSPC conditions") recalculated the number of credits needed for a long symlink, in the process of splitting it into two transactions. However, the first credit calculation under-counted because if selinux is enabled, credits are needed to create the selinux xattr as well. Overrunning the reservation will result in an OOPS in jbd2_journal_dirty_metadata() due to this assert: J_ASSERT_JH(jh, handle->h_buffer_credits > 0); Fix this by increasing the reservation size. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Jan Kara <jack@suse.cz> Acked-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/ext4/namei.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index b754b7721f5..458a394f6d3 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2264,9 +2264,11 @@ static int ext4_symlink(struct inode *dir,
/*
* For non-fast symlinks, we just allocate inode and put it on
* orphan list in the first transaction => we need bitmap,
- * group descriptor, sb, inode block, quota blocks.
+ * group descriptor, sb, inode block, quota blocks, and
+ * possibly selinux xattr blocks.
*/
- credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb);
+ credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
+ EXT4_XATTR_TRANS_BLOCKS;
} else {
/*
* Fast symlink. We have to add entry to directory