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vfs: Set special lockdep map for dirs only if not set by fs

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Some filesystems need to set lockdep map for i_mutex differently for
different directories. For example OCFS2 has system directories (for
orphan inode tracking and for gathering all system files like journal
or quota files into a single place) which have different locking
locking rules than standard directories. For a filesystem setting
lockdep map is naturaly done when the inode is read but we have to
modify unlock_new_inode() not to overwrite the lockdep map the filesystem
has set.

Acked-by: [email protected]
CC: [email protected]
Signed-off-by: Jan Kara <[email protected]>
Signed-off-by: Joel Becker <[email protected]>
This commit is contained in:
Jan Kara 2009-06-04 15:26:49 +02:00 • committed by Joel Becker
commit 9a7aa12f39
2 changed files with 26 additions and 6 deletions
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17
fs/inode.c
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@ -665,12 +665,17 @@ void unlock_new_inode(struct inode *inode)
if (inode->i_mode & S_IFDIR) {
struct file_system_type *type = inode->i_sb->s_type;
/*
* ensure nobody is actually holding i_mutex
*/
mutex_destroy(&inode->i_mutex);
mutex_init(&inode->i_mutex);
lockdep_set_class(&inode->i_mutex, &type->i_mutex_dir_key);
/* Set new key only if filesystem hasn't already changed it */
if (!lockdep_match_class(&inode->i_mutex,
&type->i_mutex_key)) {
/*
* ensure nobody is actually holding i_mutex
*/
mutex_destroy(&inode->i_mutex);
mutex_init(&inode->i_mutex);
lockdep_set_class(&inode->i_mutex,
&type->i_mutex_dir_key);
}
}
#endif
/*