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f5ab0d1f8f
linux/fs/ext4
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Mingming Cao f5ab0d1f8f ext4: Fix BUG when writing to an unitialized extent 
This patch fixes a bug when writing to preallocated but uninitialized
blocks, which resulted in a BUG in fs/buffer.c saying that the buffer
is not mapped.

When writing to a file, ext4_get_block_wrap() is called with create=1 in
order to request that blocks be allocated if necessary.  It currently
calls ext4_get_blocks() with create=0 in order to do a lookup first.  If
the inode contains an unitialized data block, the buffer head is left
unampped, which ext4_get_blocks_wrap() returns, causing the BUG.

We fix this by checking to see if the buffer head is unmapped, and if
so, we make sure the the buffer head is mapped by calling
ext4_ext_get_blocks with create=1.

Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-02-25 15:29:55 -05:00
..
acl.c Introduce is_owner_or_cap() to wrap CAP_FOWNER use with fsuid check 2007-07-17 12:00:03 -07:00
acl.h
balloc.c ext[234]: cleanup ext[234]_bg_num_gdb() 2008-02-06 10:41:21 -08:00
bitmap.c fs: mark nibblemap const 2007-10-17 08:42:47 -07:00
dir.c Remove incorrect BKL comments in ext4 2008-02-25 17:20:46 -05:00
ext4_jbd2.c
extents.c ext4: Fix BUG when writing to an unitialized extent 2008-02-25 15:29:55 -05:00
file.c ext4: store maxbytes for bitmapped files and return EFBIG as appropriate 2008-01-28 23:58:27 -05:00
fsync.c ext4: sparse fixes 2007-10-17 18:50:03 -04:00
group.h ext4: add ext4_group_t, and change all group variables to this type. 2008-01-28 23:58:27 -05:00
hash.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
ialloc.c iget: stop EXT4 from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
inode.c ext4: Fix BUG when writing to an unitialized extent 2008-02-25 15:29:55 -05:00
ioctl.c ext4: Add EXT4_IOC_MIGRATE ioctl 2008-01-28 23:58:26 -05:00
Makefile ext4: Add multi block allocator for ext4 2008-01-29 00:19:52 -05:00
mballoc.c ext4: Don't claim block from group which has corrupt bitmap 2008-02-15 13:48:21 -05:00
migrate.c ext4: Fix memory and buffer head leak in callers to ext4_ext_find_extent() 2008-02-25 16:54:37 -05:00
namei.c ext4: Don't use ext4_dec_count() if not needed 2008-02-15 15:00:38 -05:00
namei.h
resize.c iget: stop EXT4 from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
super.c Introduce path_put() 2008-02-14 21:13:33 -08:00
symlink.c [PATCH] mark struct inode_operations const 1 2007-02-12 09:48:46 -08:00
xattr_security.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
xattr_trusted.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
xattr_user.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
xattr.c ext4: Add multi block allocator for ext4 2008-01-29 00:19:52 -05:00
xattr.h ext4: Expand extra_inodes space per the s_{want,min}_extra_isize fields 2007-07-18 09:19:57 -04:00