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authorMiklos Szeredi <mszeredi@suse.cz>2011-02-23 07:49:47 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-23 22:52:52 -0500
commit2aa15890f3c191326678f1bd68af61ec6b8753ec (patch)
tree347f5fdcd0678b12be92f266cd2a5e7a74749403 /fs/nilfs2/page.h
parent78794b2cdeac37ac1fd950fc9c4454b56d88ac03 (diff)
mm: prevent concurrent unmap_mapping_range() on the same inode
Michael Leun reported that running parallel opens on a fuse filesystem can trigger a "kernel BUG at mm/truncate.c:475" Gurudas Pai reported the same bug on NFS. The reason is, unmap_mapping_range() is not prepared for more than one concurrent invocation per inode. For example: thread1: going through a big range, stops in the middle of a vma and stores the restart address in vm_truncate_count. thread2: comes in with a small (e.g. single page) unmap request on the same vma, somewhere before restart_address, finds that the vma was already unmapped up to the restart address and happily returns without doing anything. Another scenario would be two big unmap requests, both having to restart the unmapping and each one setting vm_truncate_count to its own value. This could go on forever without any of them being able to finish. Truncate and hole punching already serialize with i_mutex. Other callers of unmap_mapping_range() do not, and it's difficult to get i_mutex protection for all callers. In particular ->d_revalidate(), which calls invalidate_inode_pages2_range() in fuse, may be called with or without i_mutex. This patch adds a new mutex to 'struct address_space' to prevent running multiple concurrent unmap_mapping_range() on the same mapping. [ We'll hopefully get rid of all this with the upcoming mm preemptibility series by Peter Zijlstra, the "mm: Remove i_mmap_mutex lockbreak" patch in particular. But that is for 2.6.39 ] Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Reported-by: Michael Leun <lkml20101129@newton.leun.net> Reported-by: Gurudas Pai <gurudas.pai@oracle.com> Tested-by: Gurudas Pai <gurudas.pai@oracle.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nilfs2/page.h')
-rw-r--r--fs/nilfs2/page.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/nilfs2/page.h b/fs/nilfs2/page.h
index 622df27cd891..2a00953ebd5f 100644
--- a/fs/nilfs2/page.h
+++ b/fs/nilfs2/page.h
@@ -61,7 +61,6 @@ void nilfs_free_private_page(struct page *);
61int nilfs_copy_dirty_pages(struct address_space *, struct address_space *); 61int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
62void nilfs_copy_back_pages(struct address_space *, struct address_space *); 62void nilfs_copy_back_pages(struct address_space *, struct address_space *);
63void nilfs_clear_dirty_pages(struct address_space *); 63void nilfs_clear_dirty_pages(struct address_space *);
64void nilfs_mapping_init_once(struct address_space *mapping);
65void nilfs_mapping_init(struct address_space *mapping, 64void nilfs_mapping_init(struct address_space *mapping,
66 struct backing_dev_info *bdi, 65 struct backing_dev_info *bdi,
67 const struct address_space_operations *aops); 66 const struct address_space_operations *aops);