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Dan Williams 2424b5dd06 sysfs: refill attribute buffer when reading from offset 0 
Requiring userspace to close and re-open sysfs attributes has been the
policy since before 2.6.12.  It allows userspace to get a consistent
snapshot of kernel state and consume it with incremental reads and seeks.

Now, if the file position is zero the kernel assumes userspace wants to see
the new value.  The application for this change is to allow a userspace
RAID metadata handler to check the state of an array without causing any
memory allocations.  Thus not causing writeback to a raid array that might
be blocked waiting for userspace to take action.

Cc: Neil Brown <neilb@suse.de>
Acked-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2008-04-19 19:10:29 -07:00
..
9p
Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p)
2008-02-07 08:42:26 -08:00
adfs
mount options: fix adfs
2008-02-08 09:22:39 -08:00
affs
mount options: fix affs
2008-02-08 09:22:39 -08:00
afs
AFS: Do not describe debug parameters with their value
2008-04-16 07:43:48 -07:00
autofs
mount options: fix autofs
2008-02-08 09:22:40 -08:00
autofs4
Introduce path_put()
2008-02-14 21:13:33 -08:00
befs
mount options: fix befs
2008-02-08 09:22:40 -08:00
bfs
iget: stop BFS from using iget() and read_inode()
2008-02-07 08:42:27 -08:00
cifs
cifs: fix misannotations
2008-03-30 14:20:23 -07:00
coda
Introduce path_put()
2008-02-14 21:13:33 -08:00
configfs
Introduce path_put()
2008-02-14 21:13:33 -08:00
cramfs
fs/cramfs/inode.c: replace hardcoded value with preprocessor constant
2007-10-18 14:37:29 -07:00
debugfs
debugfs: fix sparse warnings
2008-03-04 14:47:06 -08:00
devpts
mount options: fix devpts
2008-02-08 09:22:40 -08:00
dlm
dlm: fix rcom_names message to self
2008-02-21 15:19:54 -06:00
ecryptfs
eCryptfs: Swap dput() and mntput()
2008-03-19 18:53:36 -07:00
efs
efs: update error msg to not refer to deleted read_inode()
2008-04-02 15:28:19 -07:00
exportfs
exportfs: update documentation
2007-10-22 08:13:21 -07:00
ext2
vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs
2008-04-15 19:35:41 -07:00
ext3
vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs
2008-04-15 19:35:41 -07:00
ext4
vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs
2008-04-15 19:35:41 -07:00
fat
mount options: fix fat
2008-02-08 09:22:40 -08:00
freevxfs
iget: stop FreeVXFS from using iget() and read_inode()
2008-02-07 08:42:28 -08:00
fuse
fuse: fix permission checking
2008-02-23 17:12:13 -08:00
gfs2
[GFS2] fix assertion in log_refund()
2008-04-18 08:36:09 +01:00
hfs
hfs_bnode_find() can fail, resulting in hfs_bnode_split() breakage
2008-03-17 09:46:55 -07:00
hfsplus
HFS+: fix unlink of links
2008-04-10 13:37:51 -07:00
hostfs
uml: fix hostfs tv_usec calculations
2008-02-05 09:44:30 -08:00
hpfs
mount options: fix hpfs
2008-02-08 09:22:40 -08:00
hppfs
[PATCH] sanitize hppfs
2008-03-19 06:42:18 -04:00
hugetlbfs
[PATCH] double iput() on failure exit in hugetlb
2008-03-19 06:55:01 -04:00
isofs
zisofs: fix readpage() outside i_size
2008-03-19 18:53:36 -07:00
jbd
jbd/jbd2 NULL noise
2008-03-30 14:18:41 -07:00
jbd2
jbd/jbd2 NULL noise
2008-03-30 14:18:41 -07:00
jffs2
JFFS2 Fix of panics caused by wrong condition for hole frag creation in write_begin
2008-04-14 15:43:14 -07:00
jfs
jfs: replace __inline with inline
2008-03-05 14:38:22 -06:00
lockd
Wrap buffers used for rpc debug printks into RPC_IFDEBUG
2008-02-21 18:42:29 -05:00
minix
iget: stop the MINIX filesystem from using iget() and read_inode()
2008-02-07 08:42:28 -08:00
msdos
[PATCH] mark struct inode_operations const 2
2007-02-12 09:48:46 -08:00
ncpfs
mount options: fix ncpfs
2008-02-08 09:22:40 -08:00
nfs
fix bug - executing FDPIC ELF on NFS mount triggers BUG() at mm/nommu.c:862:/do_mmap_private()
2008-04-08 21:06:56 -04:00
nfs_common
…
nfsd
nfsd: fix oops on access from high-numbered ports
2008-03-14 16:49:15 -07:00
nls
sparse pointer use of zero as null
2007-10-18 14:37:31 -07:00
ntfs
is_vmalloc_addr(): Check if an address is within the vmalloc boundaries
2008-02-05 09:44:14 -08:00
ocfs2
ocfs2/net: Add debug interface to o2net
2008-04-18 08:56:20 -07:00
openpromfs
iget: stop OPENPROMFS from using iget() and read_inode()
2008-02-07 08:42:29 -08:00
partitions
block: send disk "change" event for rescan_partitions()
2008-04-19 19:10:24 -07:00
proc
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
2008-04-03 14:33:42 -07:00
qnx4
iget: stop QNX4 from using iget() and read_inode()
2008-02-07 08:42:28 -08:00
ramfs
Remove valueless definition of hard-selected RAMFS option
2007-10-17 08:42:56 -07:00
reiserfs
NULL noise: fs/*, mm/*, kernel/*
2008-03-30 14:18:41 -07:00
romfs
ROMFS: Fix up an error in iget removal
2008-03-19 18:53:36 -07:00
smbfs
NULL noise: fs/*, mm/*, kernel/*
2008-03-30 14:18:41 -07:00
sysfs
sysfs: refill attribute buffer when reading from offset 0
2008-04-19 19:10:29 -07:00
sysv
iget: stop the SYSV filesystem from using iget() and read_inode()
2008-02-07 08:42:29 -08:00
udf
udf: fix udf_add_free_space
2008-02-13 16:21:20 -08:00
ufs
fs/ufs/balloc.c: fix sparc64 printk warning
2008-03-19 18:53:37 -07:00
vfat
Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p)
2008-02-07 08:42:26 -08:00
xfs
[XFS] Fix merge failure
2008-04-18 12:59:45 +10:00
aio.c
eventfd/kaio integration fix
2008-04-11 08:06:43 -07:00
anon_inodes.c
[PATCH] fix up new filp allocators
2008-03-19 06:54:05 -04:00
attr.c
VFS: make notify_change pass ATTR_KILL_S*ID to setattr operations
2007-10-18 14:37:22 -07:00
bad_inode.c
iget: introduce a function to register iget failure
2008-02-07 08:42:26 -08:00
binfmt_aout.c
aout: suppress A.OUT library support if !CONFIG_ARCH_SUPPORTS_AOUT
2008-02-08 09:22:30 -08:00
binfmt_elf_fdpic.c
pid namespaces: changes to show virtual ids to user
2007-10-19 11:53:40 -07:00
binfmt_elf.c
core dump: user_regset writeback
2008-03-04 16:35:10 -08:00
binfmt_em86.c
Convert files to UTF-8 and some cleanups
2007-10-19 23:21:04 +02:00
binfmt_flat.c
FLAT binaries: drop BINFMT_FLAT bad header magic warning
2008-02-14 20:58:05 -08:00
binfmt_misc.c
Convert files to UTF-8 and some cleanups
2007-10-19 23:21:04 +02:00
binfmt_script.c
Convert files to UTF-8 and some cleanups
2007-10-19 23:21:04 +02:00
binfmt_som.c
aout: remove unnecessary inclusions of {asm, linux}/a.out.h
2008-02-08 09:22:30 -08:00
bio.c
Revert "unexport bio_{,un}map_user"
2008-03-17 21:14:40 +01:00
block_dev.c
fs/block_dev.c: remove #if 0'ed code
2008-02-19 10:04:00 +01:00
buffer.c
Be more careful about marking buffers dirty
2008-04-04 14:38:17 -07:00
char_dev.c
fs/char_dev.c: chrdev_open marked static and removed from fs.h
2008-02-08 09:22:42 -08:00
compat_binfmt_elf.c
x86: compat_binfmt_elf
2008-01-30 13:31:46 +01:00
compat_ioctl.c
d_path: Make d_path() use a struct path
2008-02-14 21:17:09 -08:00
compat.c
Merge branch 'linus_origin' into hotfixes
2008-02-15 13:36:30 -05:00
dcache.c
dentries: Extract common code to remove dentry from lru
2008-02-14 21:17:09 -08:00
dcookies.c
d_path: Make d_path() use a struct path
2008-02-14 21:17:09 -08:00
direct-io.c
Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user
2008-02-05 09:44:13 -08:00
dnotify.c
mm: Remove slab destructors from kmem_cache_create().
2007-07-20 10:11:58 +09:00
dquot.c
quota: add possibly missing iput() when quotaon and quotaoff races
2008-03-19 18:53:35 -07:00
drop_caches.c
invalidate_mapping_pages(): add cond_resched
2007-07-16 09:05:36 -07:00
eventfd.c
fs/eventfd.c should #include <linux/syscalls.h>
2008-02-06 10:41:03 -08:00
eventpoll.c
lockdep: annotate epoll
2008-02-05 09:44:07 -08:00
exec.c
Allow ARG_MAX execve string space even with a small stack limit
2008-03-03 10:12:14 -08:00
fcntl.c
fs: remove fastcall, it is always empty
2008-02-08 09:22:31 -08:00
fifo.c
Detach sched.h from mm.h
2007-05-21 09:18:19 -07:00
file_table.c
[PATCH] fix up new filp allocators
2008-03-19 06:54:05 -04:00
file.c
get rid of NR_OPEN and introduce a sysctl_nr_open
2008-02-06 10:41:06 -08:00
filesystems.c
add filesystem subtype support
2007-05-08 11:15:01 -07:00
fs-writeback.c
fs: fix kernel-doc notation warnings
2008-03-19 18:53:36 -07:00
generic_acl.c
Introduce is_owner_or_cap() to wrap CAP_FOWNER use with fsuid check
2007-07-17 12:00:03 -07:00
inode.c
iget: remove iget() and the read_inode() super op as being obsolete
2008-02-07 08:42:29 -08:00
inotify_user.c
Introduce path_put()
2008-02-14 21:13:33 -08:00
inotify.c
inotify: remove debug code
2008-02-06 10:41:07 -08:00
internal.h
cleanup compat ioctl handling
2007-05-08 11:15:09 -07:00
ioctl.c
fix up kerneldoc in fs/ioctl.c a little bit
2008-02-09 11:08:33 -08:00
ioprio.c
cfq-iosched: relax IOPRIO_CLASS_IDLE restrictions
2008-01-28 11:38:15 +01:00
Kconfig
ocfs2: Allow selection of cluster plug-ins.
2008-04-18 08:56:07 -07:00
Kconfig.binfmt
aout: suppress A.OUT library support if !CONFIG_ARCH_SUPPORTS_AOUT
2008-02-08 09:22:30 -08:00
libfs.c
Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user
2008-02-05 09:44:13 -08:00
locks.c
locks: fix possible infinite loop in fcntl(F_SETLKW) over nfs
2008-04-14 12:22:14 -07:00
Makefile
x86: compat_binfmt_elf Kconfig
2008-01-30 13:31:46 +01:00
mbcache.c
vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs
2008-04-15 19:35:41 -07:00
mpage.c
docbook: fix filesystems.tmpl source files
2008-03-03 10:47:13 -08:00
namei.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2008-03-25 08:57:47 -07:00
namespace.c
[PATCH] mnt_expire is protected by namespace_sem, no need for vfsmount_lock
2008-03-27 20:48:04 -04:00
nfsctl.c
Introduce path_put()
2008-02-14 21:13:33 -08:00
no-block.c
…
open.c
asmlinkage_protect replaces prevent_tail_call
2008-04-10 17:28:26 -07:00
pipe.c
[PATCH] fix up new filp allocators
2008-03-19 06:54:05 -04:00
pnode.c
[PATCH] count ghost references to vfsmounts
2008-03-27 20:47:46 -04:00
pnode.h
[PATCH] new helpers - collect_mounts() and release_collected_mounts()
2007-10-21 02:37:25 -04:00
posix_acl.c
…
quota_v1.c
…
quota_v2.c
…
quota.c
Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p)
2008-02-07 08:42:26 -08:00
read_write.c
remove the unused exports of sys_open/sys_read
2008-02-08 09:22:36 -08:00
read_write.h
…
readdir.c
Use mutex_lock_killable in vfs_readdir
2007-12-06 17:39:54 -05:00
select.c
make sys_poll() wait at least timeout ms
2008-02-06 10:41:09 -08:00
seq_file.c
d_path: Make d_path() use a struct path
2008-02-14 21:17:09 -08:00
signalfd.c
signalfd: fix for incorrect SI_QUEUE user data reporting
2008-04-11 08:06:44 -07:00
splice.c
splice: fix infinite loop in generic_file_splice_read()
2008-04-10 08:24:25 +02:00
stack.c
[PATCH] fs/stack.c: Copy i_nlink after all other attributes are copied
2007-02-19 14:21:50 -08:00
stat.c
Introduce path_put()
2008-02-14 21:13:33 -08:00
super.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2008-03-25 08:57:47 -07:00
sync.c
Introduce fixed sys_sync_file_range2() syscall, implement on PowerPC and ARM
2007-06-28 11:38:30 -07:00
timerfd.c
timerfd: new timerfd API
2008-02-05 09:44:07 -08:00
utimes.c
Introduce path_put()
2008-02-14 21:13:33 -08:00
xattr_acl.c
[PATCH] remove many unneeded #includes of sched.h
2007-02-14 08:09:54 -08:00
xattr.c
Introduce path_put()
2008-02-14 21:13:33 -08:00