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authorDave Chinner <dchinner@redhat.com>2011-03-22 22:23:36 +1100
committerAl Viro <viro@zeniv.linux.org.uk>2011-03-24 21:16:31 -0400
commit250df6ed274d767da844a5d9f05720b804240197 (patch)
treeb74f49a86c4451d9e3e82f90e3f791163025be21 /mm
parent3dc8fe4dca9cd3e4aa828ed36451e2bcfd2350da (diff)
downloadop-kernel-dev-250df6ed274d767da844a5d9f05720b804240197.zip
op-kernel-dev-250df6ed274d767da844a5d9f05720b804240197.tar.gz
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')
-rw-r--r--mm/filemap.c2
-rw-r--r--mm/rmap.c1
2 files changed, 3 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index f807afd..499e9aa 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -99,7 +99,9 @@
* ->private_lock (page_remove_rmap->set_page_dirty)
* ->tree_lock (page_remove_rmap->set_page_dirty)
* ->inode_lock (page_remove_rmap->set_page_dirty)
+ * ->inode->i_lock (page_remove_rmap->set_page_dirty)
* ->inode_lock (zap_pte_range->set_page_dirty)
+ * ->inode->i_lock (zap_pte_range->set_page_dirty)
* ->private_lock (zap_pte_range->__set_page_dirty_buffers)
*
* (code doesn't rely on that order, so you could switch it around)
diff --git a/mm/rmap.c b/mm/rmap.c
index 4a8e99a..7dada04 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -32,6 +32,7 @@
* 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)
* 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,
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