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ext4: add mutex_is_locked() assertion to ext4_truncate()

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[ Added fixup from Lukáš Czerner which only checks the assertion when
  the inode is not new and is not being freed. ]

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2013-04-03 21:58:52 -04:00
parent 819c4920b7
commit 19b5ef6157
1 changed files with 7 additions and 0 deletions
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7
fs/ext4/inode.c
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@ -3788,6 +3788,13 @@ void ext4_truncate(struct inode *inode)
struct address_space *mapping = inode->i_mapping;
loff_t page_len;
/*
* There is a possibility that we're either freeing the inode
* or it completely new indode. In those cases we might not
* have i_mutex locked because it's not necessary.
*/
if (!(inode->i_state & (I_NEW|I_FREEING)))
WARN_ON(!mutex_is_locked(&inode->i_mutex));
trace_ext4_truncate_enter(inode);
if (!ext4_can_truncate(inode))