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| author | Kalpak Shah <kalpak.shah@sun.com> | 2008-10-08 23:21:54 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-10-08 23:21:54 -0400 |
| commit | 4d20c685fa365766a8f13584b4c8178a15ab7103 (patch) | |
| tree | 7a2aaf1b27703818d67d1d7cf544dc72455638d1 /fs/ext4/xattr.c | |
| parent | 45a90bfd90c1215bf824c0f705b409723f52361b (diff) | |
| download | lwn-4d20c685fa365766a8f13584b4c8178a15ab7103.tar.gz lwn-4d20c685fa365766a8f13584b4c8178a15ab7103.zip | |
ext4: fix xattr deadlock
ext4_xattr_set_handle() eventually ends up calling
ext4_mark_inode_dirty() which tries to expand the inode by shifting
the EAs. This leads to the xattr_sem being downed again and leading
to a deadlock.
This patch makes sure that if ext4_xattr_set_handle() is in the
call-chain, ext4_mark_inode_dirty() will not expand the inode.
Signed-off-by: Kalpak Shah <kalpak.shah@sun.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/xattr.c')
| -rw-r--r-- | fs/ext4/xattr.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 8954208b4893..362b0edd3dbe 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -959,6 +959,7 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, struct ext4_xattr_block_find bs = { .s = { .not_found = -ENODATA, }, }; + unsigned long no_expand; int error; if (!name) @@ -966,6 +967,9 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, if (strlen(name) > 255) return -ERANGE; down_write(&EXT4_I(inode)->xattr_sem); + no_expand = EXT4_I(inode)->i_state & EXT4_STATE_NO_EXPAND; + EXT4_I(inode)->i_state |= EXT4_STATE_NO_EXPAND; + error = ext4_get_inode_loc(inode, &is.iloc); if (error) goto cleanup; @@ -1042,6 +1046,8 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, cleanup: brelse(is.iloc.bh); brelse(bs.bh); + if (no_expand == 0) + EXT4_I(inode)->i_state &= ~EXT4_STATE_NO_EXPAND; up_write(&EXT4_I(inode)->xattr_sem); return error; } |