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[PATCH] mm: more commenting on lock ordering

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Clarify lockorder comments now that sys_msync dropps mmap_sem before
calling do_fsync.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-10-19 23:29:10 -07:00 committed by Linus Torvalds
parent b95936cb92
commit 82591e6ea2
2 changed files with 17 additions and 23 deletions
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4
mm/filemap.c
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@ -75,8 +75,8 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
* ->mmap_sem
* ->lock_page (access_process_vm)
*
* ->mmap_sem
* ->i_mutex (msync)
* ->i_mutex (generic_file_buffered_write)
* ->mmap_sem (fault_in_pages_readable->do_page_fault)
*
* ->i_mutex
* ->i_alloc_sem (various)

8
mm/rmap.c
View file

@ -21,13 +21,7 @@
* Lock ordering in mm:
*
* inode->i_mutex (while writing or truncating, not reading or faulting)
* inode->i_alloc_sem
*
* When a page fault occurs in writing from user to file, down_read
* of mmap_sem nests within i_mutex; in sys_msync, i_mutex nests within
* down_read of mmap_sem; i_mutex and down_write of mmap_sem are never
* taken together; in truncation, i_mutex is taken outermost.
*
* inode->i_alloc_sem (vmtruncate_range)
* mm->mmap_sem
* page->flags PG_locked (lock_page)
* mapping->i_mmap_lock