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| author | Jan Kara <jack@suse.cz> | 2016-08-11 12:38:55 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-15 08:27:50 +0200 |
| commit | 77ae14d00650e7f7b2144019b855acbc6e27003f (patch) | |
| tree | 9b127c3fe44f02034d0cc36864c31dabe63b7ac2 /Documentation/misc-devices | |
| parent | a79f1f7fcbe478e22cb4ff5f524847ec584177fe (diff) | |
ext4: avoid deadlock when expanding inode size
commit 2e81a4eeedcaa66e35f58b81e0755b87057ce392 upstream.
When we need to move xattrs into external xattr block, we call
ext4_xattr_block_set() from ext4_expand_extra_isize_ea(). That may end
up calling ext4_mark_inode_dirty() again which will recurse back into
the inode expansion code leading to deadlocks.
Protect from recursion using EXT4_STATE_NO_EXPAND inode flag and move
its management into ext4_expand_extra_isize_ea() since its manipulation
is safe there (due to xattr_sem) from possible races with
ext4_xattr_set_handle() which plays with it as well.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/misc-devices')
0 files changed, 0 insertions, 0 deletions