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author | Louis Rilling <Louis.Rilling@kerlabs.com> | 2008-06-16 19:00:58 +0200 |
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committer | Mark Fasheh <mfasheh@suse.com> | 2008-07-14 22:57:15 +0200 |
commit | 6f61076406251626be39651d114fac412b1e0c39 (patch) | |
tree | d7adb1de212cfb7ead490b448bf75ce3b3b91c9c /include/asm-mips/mach-pb1x00 | |
parent | ocfs2: Don't snprintf() without a format. (diff) | |
download | linux-6f61076406251626be39651d114fac412b1e0c39.tar.xz linux-6f61076406251626be39651d114fac412b1e0c39.zip |
configfs: Introduce configfs_dirent_lock
This patch introduces configfs_dirent_lock spinlock to protect configfs_dirent
traversals against linkage mutations (add/del/move). This will allow
configfs_detach_prep() to avoid locking i_mutexes.
Locking rules for configfs_dirent linkage mutations are the same plus the
requirement of taking configfs_dirent_lock. For configfs_dirent walking, one can
either take appropriate i_mutex as before, or take configfs_dirent_lock.
The spinlock could actually be a mutex, but the critical sections are either
O(1) or should not be too long (default groups walking in last patch).
ChangeLog:
- Clarify the comment on configfs_dirent_lock usage
- Move sd->s_element init before linking the new dirent
- In lseek(), do not release configfs_dirent_lock before the dirent is
relinked.
Signed-off-by: Louis Rilling <Louis.Rilling@kerlabs.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'include/asm-mips/mach-pb1x00')
0 files changed, 0 insertions, 0 deletions