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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>
This commit is contained in:
Kalpak Shah 2008-10-08 23:21:54 -04:00 committed by Theodore Ts'o
parent 45a90bfd90
commit 4d20c685fa
1 changed files with 6 additions and 0 deletions
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6
fs/ext4/xattr.c
View File

@ -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;
}