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Lukas Czerner 4234fb29a8 ext4: fix free clusters calculation in bigalloc filesystem 
commit 304e220f08 upstream.

ext4_has_free_clusters() should tell us whether there is enough free
clusters to allocate, however number of free clusters in the file system
is converted to blocks using EXT4_C2B() which is not only wrong use of
the macro (we should have used EXT4_NUM_B2C) but it's also completely
wrong concept since everything else is in cluster units.

Moreover when calculating number of root clusters we should be using
macro EXT4_NUM_B2C() instead of EXT4_B2C() otherwise the result might be
off by one. However r_blocks_count should always be a multiple of the
cluster ratio so doing a plain bit shift should be enough here. We
avoid using EXT4_B2C() because it's confusing.

As a result of the first problem number of free clusters is much bigger
than it should have been and ext4_has_free_clusters() would return 1 even
if there is really not enough free clusters available.

Fix this by removing the EXT4_C2B() conversion of free clusters and
using bit shift when calculating number of root clusters. This bug
affects number of xfstests tests covering file system ENOSPC situation
handling. With this patch most of the ENOSPC problems with bigalloc file
system disappear, especially the errors caused by delayed allocation not
having enough space when the actual allocation is finally requested.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-03-04 06:06:42 +08:00
..
9p 9p changes for the 3.4 merge window 2012-03-28 09:58:38 -07:00
adfs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
affs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
afs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
autofs4 autofs4 - fix reset pending flag on mount fail 2012-10-21 09:27:59 -07:00
befs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
bfs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
btrfs Btrfs: call the ordered free operation without any locks held 2012-08-09 08:31:37 -07:00
cachefiles switch touch_atime to struct path 2012-03-20 21:29:41 -04:00
ceph libceph: Unlock unprocessed pages in start_read() error path 2013-01-17 08:51:21 -08:00
cifs fs/cifs/cifs_dfs_ref.c: fix potential memory leakage 2013-02-03 18:24:40 -06:00
coda Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
configfs make configfs_pin_fs() return root dentry on success 2012-03-20 21:29:48 -04:00
cramfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
debugfs simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
devpts Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
dlm dlm fixes for 3.4 2012-04-23 18:22:42 -07:00
ecryptfs eCryptfs: check for eCryptfs cipher support at mount 2012-11-26 11:37:49 -08:00
efs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
exofs ore: Fix out-of-bounds access in _ios_obj() 2012-08-15 08:10:09 -07:00
exportfs
ext2 migrate ext2_fs.h guts to fs/ext2/ext2.h 2012-03-31 16:03:16 -04:00
ext3 ext3: Fix fdatasync() for files with only i_size changes 2012-09-14 10:00:32 -07:00
ext4 ext4: fix free clusters calculation in bigalloc filesystem 2013-03-04 06:06:42 +08:00
fat fat: fix bug in enforcing Long File Name length 2012-03-23 16:58:40 -07:00
freevxfs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
fscache
fuse fuse: fix retrieve length 2012-09-14 10:00:32 -07:00
gfs2 GFS2: Test bufdata with buffer locked and gfs2_log_lock held 2013-01-17 08:51:06 -08:00
hfs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
hfsplus hfsplus: fix bless ioctl when used with hardlinks 2012-06-22 11:36:57 -07:00
hostfs Merge branch 'for-linus-3.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 2012-03-27 18:29:53 -07:00
hpfs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
hppfs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
hugetlbfs hugetlbfs: lockdep annotate root inode properly 2012-04-25 21:26:34 -07:00
isofs tmpfs,ceph,gfs2,isofs,reiserfs,xfs: fix fh_len checking 2012-10-21 09:27:57 -07:00
jbd jbd: Fix lock ordering bug in journal_unmap_buffer() 2012-12-03 11:47:10 -08:00
jbd2 jbd2: fix assertion failure in jbd2_journal_flush() 2013-01-17 08:50:52 -08:00
jffs2 jffs2: hold erase_completion_lock on exit 2013-01-17 08:50:46 -08:00
jfs jfs: mising cleanup on register_filesystem() failure 2012-03-20 21:29:48 -04:00
lockd NLM: Ensure that we resend all pending blocking locks after a reclaim 2013-02-28 06:59:02 -08:00
logfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
minix Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
ncpfs Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
nfs umount oops when remove blocklayoutdriver first 2013-02-28 06:59:02 -08:00
nfs_common
nfsd nfsd: avoid permission checks on EXCLUSIVE_CREATE replay 2013-01-11 09:06:55 -08:00
nilfs2 nilfs2: fix fix very long mount time issue 2013-02-11 08:47:18 -08:00
nls
notify inotify: remove broken mask checks causing unmount to be EINVAL 2013-02-28 06:59:01 -08:00
ntfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
ocfs2 ocfs2: ac->ac_allow_chain_relink=0 won't disable group relink 2013-03-04 06:06:40 +08:00
omfs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
openpromfs switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
proc nohz: Fix idle ticks in cpu summary line of /proc/stat 2012-10-28 10:14:12 -07:00
pstore Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
qnx4 qnx4: new helper - try_extent() 2012-03-20 21:29:52 -04:00
qnx6 fs: initial qnx6fs addition 2012-03-20 21:29:38 -04:00
quota Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs 2012-03-28 10:00:14 -07:00
ramfs fs: ramfs: file-nommu: add SetPageUptodate() 2012-07-16 09:04:45 -07:00
reiserfs reiserfs: Protect reiserfs_quota_write() with write lock 2012-11-26 11:38:02 -08:00
romfs MTD merge for 3.4 2012-03-30 17:31:56 -07:00
squashfs Add an extra mount time sanity check, plus some code cleanups and bug fixes. 2012-03-28 18:05:54 -07:00
sysfs sysfs: sysfs_pathname/sysfs_add_one: Use strlcat() instead of strcat() 2012-10-31 10:02:57 -07:00
sysv switch open-coded instances of d_make_root() to new helper 2012-03-20 21:29:35 -04:00
ubifs UBIFS: fix compilation warning 2012-12-03 11:46:35 -08:00
udf udf: don't increment lenExtents while writing to a hole 2013-01-17 08:50:53 -08:00
ufs Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
xfs xfs: Fix possible use-after-free with AIO 2013-02-03 18:24:40 -06:00
aio.c vfs: make AIO use the proper rw_verify_area() area helpers 2012-06-01 15:18:14 +08:00
anon_inodes.c anon_inodes: move allocation of anon_inode into ->mount() 2012-03-20 21:29:45 -04:00
attr.c vfs: increment iversion when a file is truncated 2012-06-10 00:36:12 +09:00
bad_inode.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
binfmt_aout.c VM: add "vm_mmap()" helper function 2012-04-20 17:29:13 -07:00
binfmt_elf.c coredump: prevent double-free on an error path in core dumper 2012-10-07 08:32:27 -07:00
binfmt_elf_fdpic.c VM: add "vm_mmap()" helper function 2012-04-20 17:29:13 -07:00
binfmt_em86.c __register_binfmt() made void 2012-03-20 21:29:46 -04:00
binfmt_flat.c VM: add "vm_mmap()" helper function 2012-04-20 17:29:13 -07:00
binfmt_misc.c exec: do not leave bprm->interp on stack 2013-01-11 09:06:30 -08:00
binfmt_script.c exec: do not leave bprm->interp on stack 2013-01-11 09:06:30 -08:00
binfmt_som.c VM: add "vm_mmap()" helper function 2012-04-20 17:29:13 -07:00
bio-integrity.c fs: remove the second argument of k[un]map_atomic() 2012-03-20 21:48:21 +08:00
bio.c bio allocation failure due to bio_get_nr_vecs() 2012-05-11 16:45:12 +02:00
block_dev.c fs/block_dev.c: page cache wrongly left invalidated after revalidate_disk() 2013-02-28 06:59:01 -08:00
buffer.c block: replace __getblk_slow misfix by grow_dev_page fix 2012-09-14 10:00:20 -07:00
char_dev.c
compat.c vfs: missed source of ->f_pos races 2012-09-14 10:00:05 -07:00
compat_binfmt_elf.c
compat_ioctl.c fs/compat_ioctl.c: VIDEO_SET_SPU_PALETTE missing error check 2012-10-31 10:02:55 -07:00
dcache.c vfs: dcache: fix deadlock in tree traversal 2012-10-07 08:32:22 -07:00
dcookies.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
direct-io.c fs: Fix possible use-after-free with AIO 2013-03-04 06:06:41 +08:00
drop_caches.c
eventfd.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
eventpoll.c epoll: prevent missed events on EPOLL_CTL_MOD 2013-01-17 08:50:54 -08:00
exec.c exec: do not leave bprm->interp on stack 2013-01-11 09:06:30 -08:00
fcntl.c Wrap accesses to the fd_sets in struct fdtable 2012-02-19 10:30:52 -08:00
fhandle.c
fifo.c fifo: Do not restart open() if it already found a partner 2012-07-19 08:58:56 -07:00
file.c Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-03-29 18:12:23 -07:00
file_table.c vfs: drop_file_write_access() made static 2012-03-20 21:29:32 -04:00
filesystems.c
fs-writeback.c ext4: fix potential deadlock in ext4_nonda_switch() 2012-10-13 05:38:49 +09:00
fs_struct.c The following text was taken from the original review request: 2012-03-24 10:24:31 -07:00
generic_acl.c
inode.c trim includes in inode.c 2012-03-20 21:29:51 -04:00
internal.h
ioctl.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
ioprio.c block: strip out locking optimization in put_io_context() 2012-02-07 07:51:30 +01:00
Kconfig Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2012-03-21 13:36:41 -07:00
Kconfig.binfmt
libfs.c dentry leak in simple_fill_super() failure exit 2012-04-09 01:39:22 -04:00
locks.c locks: fix checking of fcntl_setlease argument 2012-08-09 08:31:29 -07:00
Makefile fs: initial qnx6fs addition 2012-03-20 21:29:38 -04:00
mbcache.c
mount.h
mpage.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
namei.c vfs: make word-at-a-time accesses handle a non-existing page 2012-05-03 14:01:40 -07:00
namespace.c vfs: umount_tree() might be called on subtree that had never made it 2012-06-10 00:36:12 +09:00
no-block.c
open.c vfs: canonicalize create mode in build_open_flags() 2012-09-14 10:00:05 -07:00
pipe.c pipes: add a "packetized pipe" mode for writing 2012-04-29 13:12:42 -07:00
pnode.c
pnode.h
posix_acl.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
proc_namespace.c
read_write.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
read_write.h
readdir.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
select.c posix_types.h: Cleanup stale __NFDBITS and related definitions 2012-08-09 08:31:39 -07:00
seq_file.c The following text was taken from the original review request: 2012-03-24 10:24:31 -07:00
signalfd.c epoll: ep_unregister_pollwait() can use the freed pwq->whead 2012-02-24 11:42:50 -08:00
splice.c tcp: fix MSG_SENDPAGE_NOTLAST logic 2013-01-11 09:07:14 -08:00
stack.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
stat.c vfs: make O_PATH file descriptors usable for 'fstat()' 2012-10-02 10:29:51 -07:00
statfs.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
super.c The following text was taken from the original review request: 2012-03-24 10:24:31 -07:00
sync.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00
timerfd.c
utimes.c
xattr.c fs/xattr.c:setxattr(): improve handling of allocation failures 2012-04-05 15:25:50 -07:00
xattr_acl.c fs: reduce the use of module.h wherever possible 2012-02-28 19:31:58 -05:00