Revision 4ceb5db9757aaeadcf8fbbf97d76bd42aa4df0d6 authored by Linus Torvalds on 01 August 2005, 18:14:49 UTC, committed by Linus Torvalds on 01 August 2005, 18:14:49 UTC
There's no real guarantee that handle_mm_fault() will always be able to break a COW situation - if an update from another thread ends up modifying the page table some way, handle_mm_fault() may end up requiring us to re-try the operation. That's normally fine, but get_user_pages() ended up re-trying it as a read, and thus a write access could in theory end up losing the dirty bit or be done on a page that had not been properly COW'ed. This makes get_user_pages() always retry write accesses as write accesses by making "follow_page()" require that a writable follow has the dirty bit set. That simplifies the code and solves the race: if the COW break fails for some reason, we'll just loop around and try again. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 17.4 KB |
| Makefile | -rw-r--r-- | 895 bytes |
| calibrate.c | -rw-r--r-- | 4.7 KB |
| do_mounts.c | -rw-r--r-- | 9.1 KB |
| do_mounts.h | -rw-r--r-- | 1.7 KB |
| do_mounts_devfs.c | -rw-r--r-- | 2.8 KB |
| do_mounts_initrd.c | -rw-r--r-- | 3.0 KB |
| do_mounts_md.c | -rw-r--r-- | 7.6 KB |
| do_mounts_rd.c | -rw-r--r-- | 10.0 KB |
| initramfs.c | -rw-r--r-- | 9.9 KB |
| main.c | -rw-r--r-- | 16.4 KB |
| version.c | -rw-r--r-- | 748 bytes |
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