fs: move i_wb_list out from under inode_lock
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: NDave Chinner <dchinner@redhat.com> Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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