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quota: Fix dquot_transfer for filesystems different from ext4

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commit 05b5d898235401c489c68e1f3bc5706a29ad5713 upstream.

Commit fd8fbfc1 modified the way we find amount of reserved space
belonging to an inode. The amount of reserved space is checked
from dquot_transfer and thus inode_reserved_space gets called
even for filesystems that don't provide get_reserved_space callback
which results in a BUG.

Fix the problem by checking get_reserved_space callback and return 0 if
the filesystem does not provide it.

CC: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jan Kara
2010-01-06 18:03:36 +01:00
committed by Greg Kroah-Hartman
parent 5f5f8158a8
commit e49ba5624b
1 changed files with 3 additions and 0 deletions
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3
fs/quota/dquot.c
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@@ -1425,6 +1425,9 @@ static void inode_sub_rsv_space(struct inode *inode, qsize_t number)
static qsize_t inode_get_rsv_space(struct inode *inode)
{
qsize_t ret;
if (!inode->i_sb->dq_op->get_reserved_space)
return 0;
spin_lock(&inode->i_lock);
ret = *inode_reserved_space(inode);
spin_unlock(&inode->i_lock);