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vfs: pull ext4's double-i_mutex-locking into common code

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We want to do this elsewhere as well.

Also catch any attempts to use it for directories (where this ordering
would conflict with ancestor-first directory ordering in lock_rename).

Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Dave Chinner <david@fromorbit.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
J. Bruce Fields 2012-04-18 15:16:33 -04:00 • committed by Al Viro
parent f27c9298fd
commit 375e289ea8
5 changed files with 43 additions and 42 deletions
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3
include/linux/fs.h
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@ -637,6 +637,9 @@ enum inode_i_mutex_lock_class
I_MUTEX_QUOTA
};
void lock_two_nondirectories(struct inode *, struct inode*);
void unlock_two_nondirectories(struct inode *, struct inode*);
/*
* NOTE: in a 32bit arch with a preemptable kernel and
* an UP compile the i_size_read/write must be atomic