aboutsummaryrefslogtreecommitdiffstats
path: root/mm/rmap.c
diff options
context:
space:
mode:
authorDave Chinner <dchinner@redhat.com>2011-03-22 07:23:36 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-24 21:16:31 -0400
commit250df6ed274d767da844a5d9f05720b804240197 (patch)
treeb74f49a86c4451d9e3e82f90e3f791163025be21 /mm/rmap.c
parent3dc8fe4dca9cd3e4aa828ed36451e2bcfd2350da (diff)
fs: protect inode->i_state with inode->i_lock
Protect inode state transitions and validity checks with the inode->i_lock. This enables us to make inode state transitions independently of the inode_lock and is the first step to peeling away the inode_lock from the code. This requires that __iget() is done atomically with i_state checks during list traversals so that we don't race with another thread marking the inode I_FREEING between the state check and grabbing the reference. Also remove the unlock_new_inode() memory barrier optimisation required to avoid taking the inode_lock when clearing I_NEW. Simplify the code by simply taking the inode->i_lock around the state change and wakeup. Because the wakeup is no longer tricky, remove the wake_up_inode() function and open code the wakeup where necessary. Signed-off-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm/rmap.c')
-rw-r--r--mm/rmap.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/rmap.c b/mm/rmap.c
index 4a8e99a0fb97..7dada0456448 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -32,6 +32,7 @@
32 * mmlist_lock (in mmput, drain_mmlist and others) 32 * mmlist_lock (in mmput, drain_mmlist and others)
33 * mapping->private_lock (in __set_page_dirty_buffers) 33 * mapping->private_lock (in __set_page_dirty_buffers)
34 * inode_lock (in set_page_dirty's __mark_inode_dirty) 34 * inode_lock (in set_page_dirty's __mark_inode_dirty)
35 * inode->i_lock (in set_page_dirty's __mark_inode_dirty)
35 * sb_lock (within inode_lock in fs/fs-writeback.c) 36 * sb_lock (within inode_lock in fs/fs-writeback.c)
36 * mapping->tree_lock (widely used, in set_page_dirty, 37 * mapping->tree_lock (widely used, in set_page_dirty,
37 * in arch-dependent flush_dcache_mmap_lock, 38 * in arch-dependent flush_dcache_mmap_lock,