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| author | Andrew Morton <akpm@osdl.org> | 2007-01-30 14:36:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-30 16:01:35 -0800 |
| commit | fa8609da993b04dc2dd762173a6d0ab1a192e256 (patch) | |
| tree | acf6440950b722e3acdc0beba497bf0b640e588e | |
| parent | 3896625d0badd53dbc34d584861a36ba7eb4613f (diff) | |
| download | lwn-fa8609da993b04dc2dd762173a6d0ab1a192e256.tar.gz lwn-fa8609da993b04dc2dd762173a6d0ab1a192e256.zip | |
[PATCH] ntfs: kmap_atomic() atomicity fix
The KM_BIO_SRC_IRQ kmap slot requires local irq protection.
Acked-by: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/ntfs/aops.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c index 7b2c8f4f6a6f..629e7abdd840 100644 --- a/fs/ntfs/aops.c +++ b/fs/ntfs/aops.c @@ -92,10 +92,12 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) ofs = 0; if (file_ofs < init_size) ofs = init_size - file_ofs; + local_irq_save(flags); kaddr = kmap_atomic(page, KM_BIO_SRC_IRQ); memset(kaddr + bh_offset(bh) + ofs, 0, bh->b_size - ofs); kunmap_atomic(kaddr, KM_BIO_SRC_IRQ); + local_irq_restore(flags); flush_dcache_page(page); } } else { @@ -143,11 +145,13 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) recs = PAGE_CACHE_SIZE / rec_size; /* Should have been verified before we got here... */ BUG_ON(!recs); + local_irq_save(flags); kaddr = kmap_atomic(page, KM_BIO_SRC_IRQ); for (i = 0; i < recs; i++) post_read_mst_fixup((NTFS_RECORD*)(kaddr + i * rec_size), rec_size); kunmap_atomic(kaddr, KM_BIO_SRC_IRQ); + local_irq_restore(flags); flush_dcache_page(page); if (likely(page_uptodate && !PageError(page))) SetPageUptodate(page); |