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ocfs2: release page lock before calling ->page_mkwrite

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__do_fault() was calling ->page_mkwrite() with the page lock held, which
violates the locking rules for that callback.  Release and retake the page
lock around the callback to avoid deadlocking file systems which manually
take it.

Signed-off-by: Mark Fasheh <[email protected]>
Cc: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mark Fasheh 2007-07-19 01:47:00 -07:00 • committed by Linus Torvalds
commit 6967614761
1 changed files with 9 additions and 5 deletions
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14
mm/memory.c
View file

@ -2369,11 +2369,14 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
* address space wants to know that the page is about
* to become writable
*/
if (vma->vm_ops->page_mkwrite &&
vma->vm_ops->page_mkwrite(vma, page) < 0) {
fdata.type = VM_FAULT_SIGBUS;
anon = 1; /* no anon but release faulted_page */
goto out;
if (vma->vm_ops->page_mkwrite) {
unlock_page(page);
if (vma->vm_ops->page_mkwrite(vma, page) < 0) {
fdata.type = VM_FAULT_SIGBUS;
anon = 1; /* no anon but release faulted_page */
goto out_unlocked;
}
lock_page(page);
}
}
@ -2425,6 +2428,7 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
out:
unlock_page(faulted_page);
out_unlocked:
if (anon)
page_cache_release(faulted_page);
else if (dirty_page) {