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| author | Alan Cox <alan@linux.intel.com> | 2012-12-20 15:05:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-20 17:40:19 -0800 |
| commit | 5daa669c80c121ab75ecdf1c8e2df52f072fd25e (patch) | |
| tree | 2b630dfed7fe5a88c1defe53dcdad10fee4d33f5 /fs/hfsplus | |
| parent | 44fd07e989a9a27476d8963296688127a4fd4df4 (diff) | |
| download | lwn-5daa669c80c121ab75ecdf1c8e2df52f072fd25e.tar.gz lwn-5daa669c80c121ab75ecdf1c8e2df52f072fd25e.zip | |
hfsplus: avoid crash on failed block map free
If the read fails we kmap an error code. This doesn't end well. Instead
print a critical error and pray. This mirrors the rest of the fs
behaviour with critical error cases.
Acked-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Jan Kara <jack@suse.cz>
Acked-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hfsplus')
| -rw-r--r-- | fs/hfsplus/bitmap.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/hfsplus/bitmap.c b/fs/hfsplus/bitmap.c index 4cfbe2edd296..6feefc0cb48a 100644 --- a/fs/hfsplus/bitmap.c +++ b/fs/hfsplus/bitmap.c @@ -176,12 +176,14 @@ int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count) dprint(DBG_BITMAP, "block_free: %u,%u\n", offset, count); /* are all of the bits in range? */ if ((offset + count) > sbi->total_blocks) - return -2; + return -ENOENT; mutex_lock(&sbi->alloc_mutex); mapping = sbi->alloc_file->i_mapping; pnr = offset / PAGE_CACHE_BITS; page = read_mapping_page(mapping, pnr, NULL); + if (IS_ERR(page)) + goto kaboom; pptr = kmap(page); curr = pptr + (offset & (PAGE_CACHE_BITS - 1)) / 32; end = pptr + PAGE_CACHE_BITS / 32; @@ -214,6 +216,8 @@ int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count) set_page_dirty(page); kunmap(page); page = read_mapping_page(mapping, ++pnr, NULL); + if (IS_ERR(page)) + goto kaboom; pptr = kmap(page); curr = pptr; end = pptr + PAGE_CACHE_BITS / 32; @@ -232,4 +236,11 @@ out: mutex_unlock(&sbi->alloc_mutex); return 0; + +kaboom: + printk(KERN_CRIT "hfsplus: unable to mark blocks free: error %ld\n", + PTR_ERR(page)); + mutex_unlock(&sbi->alloc_mutex); + + return -EIO; } |