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7f93cff90f
linux/fs/ext4
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Theodore Ts'o 7f93cff90f ext4: fix kernel oops if the journal superblock has a non-zero j_errno 
Commit 84061e0 fixed an accounting bug only to introduce the
possibility of a kernel OOPS if the journal has a non-zero j_errno
field indicating that the file system had detected a fs inconsistency.
After the journal replay, if the journal superblock indicates that the
file system has an error, this indication is transfered to the file
system and then ext4_commit_super() is called to write this to the
disk.

But since the percpu counters are now initialized after the journal
replay, the call to ext4_commit_super() will cause a kernel oops since
it needs to use the percpu counters the ext4 superblock structure.

The fix is to skip setting the ext4 free block and free inode fields
if the percpu counter has not been set.

Thanks to Ken Sumrall for reporting and analyzing the root causes of
this bug.

Addresses-Google-Bug: #3054080

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2010-10-27 21:30:13 -04:00
..
acl.c ext4: update ctime when changing the file's permission by setfacl 2010-06-15 12:19:59 -04:00
acl.h
balloc.c ext4: Clean up s_dirt handling 2010-06-11 23:14:04 -04:00
bitmap.c
block_validity.c ext4: use KMEM_CACHE instead of kmem_cache_create 2010-10-27 21:30:09 -04:00
dir.c ext4: improve llseek error handling for overly large seek offsets 2010-10-27 21:30:06 -04:00
ext4_extents.h ext4: Calculate metadata requirements more accurately 2010-01-01 02:41:30 -05:00
ext4_jbd2.c ext4: Pass line numbers to ext4_error() and friends 2010-07-27 11:56:40 -04:00
ext4_jbd2.h ext4: Pass line numbers to ext4_error() and friends 2010-07-27 11:56:40 -04:00
ext4.h ext4: Add batched discard support for ext4 2010-10-27 21:30:12 -04:00
extents.c ext4: use bio layer instead of buffer layer in mpage_da_submit_io 2010-10-27 21:30:10 -04:00
file.c ext4: improve llseek error handling for overly large seek offsets 2010-10-27 21:30:06 -04:00
fsync.c rename the generic fsync implementations 2010-05-27 22:06:06 -04:00
hash.c
ialloc.c ext4: add interface to advertise ext4 features in sysfs 2010-10-27 21:30:05 -04:00
inode.c ext4: update writeback_index based on last page scanned 2010-10-27 21:30:13 -04:00
ioctl.c ext4: Drop whitespace at end of lines 2010-05-17 07:00:00 -04:00
Kconfig ext4: Don't ask about supporting ext2/3 in ext4 if ext4 is not configured 2009-12-21 10:54:09 -05:00
Makefile ext4: use bio layer instead of buffer layer in mpage_da_submit_io 2010-10-27 21:30:10 -04:00
mballoc.c ext4: Add batched discard support for ext4 2010-10-27 21:30:12 -04:00
mballoc.h ext4: consolidate in_range() definitions 2010-03-03 23:55:01 -05:00
migrate.c ext4: Convert more i_flags references to use accessor functions 2010-06-14 09:54:48 -04:00
move_extent.c ext4: Pass line numbers to ext4_error() and friends 2010-07-27 11:56:40 -04:00
namei.c ext4: use search_dirblock() in ext4_dx_find_entry() 2010-10-27 21:30:08 -04:00
page-io.c ext4: use bio layer instead of buffer layer in mpage_da_submit_io 2010-10-27 21:30:10 -04:00
resize.c ext4: use sb_issue_zeroout in setup_new_group_blocks 2010-10-27 21:30:05 -04:00
super.c ext4: fix kernel oops if the journal superblock has a non-zero j_errno 2010-10-27 21:30:13 -04:00
symlink.c ext4: symlink must be handled via filesystem specific operation 2010-05-16 02:00:00 -04:00
xattr_security.c ext4: constify xattr_handler 2010-05-21 18:31:19 -04:00
xattr_trusted.c ext4: constify xattr_handler 2010-05-21 18:31:19 -04:00
xattr_user.c ext4: constify xattr_handler 2010-05-21 18:31:19 -04:00
xattr.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
xattr.h ext4: constify xattr_handler 2010-05-21 18:31:19 -04:00