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authorLouis Rilling <Louis.Rilling@kerlabs.com>2008-06-16 19:00:58 +0200
committerMark Fasheh <mfasheh@suse.com>2008-07-14 22:57:15 +0200
commit6f61076406251626be39651d114fac412b1e0c39 (patch)
treed7adb1de212cfb7ead490b448bf75ce3b3b91c9c /include/asm-mips/mach-pb1x00
parentocfs2: Don't snprintf() without a format. (diff)
downloadlinux-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>
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