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fs: move i_wb_list out from under inode_lock

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Protect the inode writeback list with a new global lock
inode_wb_list_lock and use it to protect the list manipulations and
traversals. This lock replaces the inode_lock as the inodes on the
list can be validity checked while holding the inode->i_lock and
hence the inode_lock is no longer needed to protect the list.

Signed-off-by: Dave Chinner <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Dave Chinner 2011-03-22 22:23:41 +11:00 • committed by Al Viro
commit a66979abad
8 changed files with 70 additions and 48 deletions
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4
mm/rmap.c
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@ -31,12 +31,12 @@
* swap_lock (in swap_duplicate, swap_info_get)
* mmlist_lock (in mmput, drain_mmlist and others)
* mapping->private_lock (in __set_page_dirty_buffers)
* inode_lock (in set_page_dirty's __mark_inode_dirty)
* inode->i_lock (in set_page_dirty's __mark_inode_dirty)
* inode_wb_list_lock (in set_page_dirty's __mark_inode_dirty)
* sb_lock (within inode_lock in fs/fs-writeback.c)
* mapping->tree_lock (widely used, in set_page_dirty,
* in arch-dependent flush_dcache_mmap_lock,
* within inode_lock in __sync_single_inode)
* within inode_wb_list_lock in __sync_single_inode)
*
* (code doesn't rely on that order so it could be switched around)
* ->tasklist_lock