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Eric W. Biederman 1e5289c97b sysfs: Cache the last sysfs_dirent to improve readdir scalability v2 
When sysfs_readdir stops short we now cache the next
sysfs_dirent to return to user space in filp->private_data.
There is no impact on the rest of sysfs by doing this and
in the common case it allows us to pick up exactly where
we left off with no seeking.

Additionally I drop and regrab the sysfs_mutex around
filldir to avoid a page fault abritrarily increasing the
hold time on the sysfs_mutex.

v2: Returned to using INT_MAX as the EOF condition.
    seekdir is ambiguous unless all directory entries have
    a unique f_pos value.

Fixes http://bugzilla.kernel.org/show_bug.cgi?id=14949

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2010-03-07 17:04:48 -08:00
..
9p
fs/9p: Add hardlink support to .u extension
2010-03-05 15:04:42 -06:00
adfs
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
affs
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
afs
make sure data is on disk before calling ->write_inode
2010-03-05 13:25:10 -05:00
autofs
trivial: remove unnecessary semicolons
2009-09-21 15:14:58 +02:00
autofs4
Use kill_litter_super() in autofs4 ->kill_sb()
2010-03-03 14:07:54 -05:00
befs
befs: fix leak
2010-02-07 03:06:21 -05:00
bfs
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
btrfs
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
cachefiles
CacheFiles: Fix a race in cachefiles_delete_object() vs rename
2010-02-20 10:06:35 -05:00
cifs
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2010-03-04 08:15:33 -08:00
coda
sysctl: Drop & in front of every proc_handler.
2009-11-18 08:37:40 -08:00
configfs
Fix configfs leak
2010-01-14 09:05:42 -05:00
cramfs
…
debugfs
Lose the new_name argument of fsnotify_move()
2010-02-08 14:38:36 -05:00
devpts
devpts_get_tty() should validate inode
2009-12-11 15:18:05 -08:00
dlm
dlm: use bastmode in debugfs output
2010-02-26 12:15:54 -06:00
ecryptfs
ecryptfs: use after free
2010-01-19 22:36:06 -06:00
efs
…
exofs
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
exportfs
nfs: new subdir Documentation/filesystems/nfs
2009-10-27 19:34:04 -04:00
ext2
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
ext3
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
ext4
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
fat
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
freevxfs
…
fscache
FS-Cache: Avoid maybe-used-uninitialised warning on variable
2009-12-16 07:20:13 -08:00
fuse
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
2010-03-03 08:08:21 -08:00
gfs2
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
hfs
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
hfsplus
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
hostfs
…
hpfs
Don't mess with generic_permission() under ->d_lock in hpfs
2010-03-03 14:07:58 -05:00
hppfs
hppfs can use existing proc_mnt, no need for do_kern_mount() in there
2010-03-03 14:08:00 -05:00
hugetlbfs
Untangling ima mess, part 1: alloc_file()
2009-12-16 12:16:47 -05:00
isofs
Merge branch 'for-2.6.33' of git://linux-nfs.org/~bfields/linux
2009-12-16 10:43:34 -08:00
jbd
jbd: Delay discarding buffers in journal_unmap_buffer
2010-03-05 00:20:26 +01:00
jbd2
jbd2: clean up an assertion in jbd2_journal_commit_transaction()
2010-02-24 12:11:20 -05:00
jffs2
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-12-16 12:04:02 -08:00
jfs
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
lockd
lockd: don't clear sm_monitored on nsm_reboot_lookup
2010-02-08 16:20:35 -05:00
logfs
Merge git://git.kernel.org/pub/scm/linux/kernel/git/joern/logfs
2010-03-06 13:18:03 -08:00
minix
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
ncpfs
tree-wide: fix assorted typos all over the place
2009-12-04 15:39:55 +01:00
nfs
Merge branch 'for-2.6.34' of git://linux-nfs.org/~bfields/linux
2010-03-06 11:31:38 -08:00
nfs_common
…
nfsd
Merge branch 'for-2.6.34' of git://linux-nfs.org/~bfields/linux
2010-03-06 11:31:38 -08:00
nilfs2
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2010-03-04 08:15:33 -08:00
nls
Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6
2009-09-30 09:31:14 -07:00
notify
switch inotify_user to anon_inode
2010-02-19 03:35:12 -05:00
ntfs
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
ocfs2
bitops: rename for_each_bit() to for_each_set_bit()
2010-03-06 11:26:23 -08:00
omfs
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
openpromfs
…
partitions
block: Stop using byte offsets
2010-01-11 14:30:09 +01:00
proc
proc: warn on non-existing proc entries
2010-03-06 11:26:45 -08:00
qnx4
qnx4: use hweight8
2009-12-16 07:20:18 -08:00
quota
quota: stop using QUOTA_OK / NO_QUOTA
2010-03-05 00:20:31 +01:00
ramfs
nommu: fix shared mmap after truncate shrinkage problems
2010-01-16 12:15:40 -08:00
reiserfs
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
romfs
fix leak in romfs_fill_super()
2010-01-26 22:22:26 -05:00
smbfs
fs: Make unload_nls() NULL pointer safe
2009-09-24 07:47:42 -04:00
squashfs
Squashfs: get rid of obsolete definition in header file
2010-03-05 15:35:35 +00:00
sysfs
sysfs: Cache the last sysfs_dirent to improve readdir scalability v2
2010-03-07 17:04:48 -08:00
sysv
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
ubifs
Revert "lib: build list_sort() only if needed"
2010-03-07 09:54:44 -08:00
udf
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
ufs
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
xfs
Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
2010-03-06 11:32:21 -08:00
aio.c
aio: remove unused field
2009-12-16 07:20:13 -08:00
anon_inodes.c
Sanitize f_flags helpers
2009-12-22 12:27:34 -05:00
attr.c
fs: use rlimit helpers
2010-03-06 11:26:29 -08:00
bad_inode.c
…
binfmt_aout.c
coredump: move dump_write() and dump_seek() into a header file
2010-03-06 11:26:45 -08:00
binfmt_elf_fdpic.c
coredump: pass mm->flags as a coredump parameter for consistency
2010-03-06 11:26:46 -08:00
binfmt_elf.c
coredump: pass mm->flags as a coredump parameter for consistency
2010-03-06 11:26:46 -08:00
binfmt_em86.c
…
binfmt_flat.c
fs: use rlimit helpers
2010-03-06 11:26:29 -08:00
binfmt_misc.c
…
binfmt_script.c
…
binfmt_som.c
Split 'flush_old_exec' into two functions
2010-01-29 08:22:01 -08:00
bio-integrity.c
block: fix bugs in bio-integrity mempool usage
2010-01-30 20:28:19 +01:00
bio.c
Revert "blkdev: fix merge_bvec_fn return value checks"
2010-03-02 19:17:34 +01:00
block_dev.c
freeze_bdev: don't deactivate successfully frozen MS_RDONLY sb
2010-02-07 03:06:21 -05:00
buffer.c
Merge branch 'writeback' of git://git.kernel.dk/linux-2.6-block
2009-09-25 09:27:30 -07:00
char_dev.c
fs/char_dev.c: remove useless loop
2009-09-24 07:21:03 -07:00
compat_binfmt_elf.c
elf coredump: replace ELF_CORE_EXTRA_* macros by functions
2010-03-06 11:26:45 -08:00
compat_ioctl.c
fs/compat_ioctl.c: suppress two warnings
2010-03-06 11:26:35 -08:00
compat.c
compat.c: Remove dependence on nfsd private headers
2009-12-14 18:12:10 -05:00
dcache.c
fix race in d_splice_alias()
2010-03-03 14:13:08 -05:00
dcookies.c
…
direct-io.c
dio: fix use-after-free
2009-12-17 04:52:13 -05:00
drop_caches.c
sysctl: remove "struct file *" argument of ->proc_handler
2009-09-24 07:21:04 -07:00
eventfd.c
eventfd - allow atomic read and waitqueue remove
2010-01-25 12:26:38 -02:00
eventpoll.c
anonfd: Allow making anon files read-only
2009-12-22 12:27:34 -05:00
exec.c
coredump: suppress uid comparison test if core output files are pipes
2010-03-06 11:26:46 -08:00
fcntl.c
fs: use rlimit helpers
2010-03-06 11:26:29 -08:00
fifo.c
…
file_table.c
vfs: take f_lock on modifying f_mode after open time
2010-03-06 11:26:25 -08:00
file.c
fs: use rlimit helpers
2010-03-06 11:26:29 -08:00
filesystems.c
…
fs_struct.c
…
fs-writeback.c
pass writeback_control to ->write_inode
2010-03-05 13:25:52 -05:00
generic_acl.c
make generic_acl slightly more generic
2009-12-16 12:16:49 -05:00
inode.c
dquot: move dquot initialization responsibility into the filesystem
2010-03-05 00:20:30 +01:00
internal.h
Take vfsmount_lock to fs/internal.h
2010-03-03 14:07:59 -05:00
ioctl.c
__generic_block_fiemap(): fix for files bigger than 4GB
2009-11-12 07:26:01 -08:00
ioprio.c
…
Kconfig
Revert "task_struct: make journal_info conditional"
2009-12-17 13:23:24 -08:00
Kconfig.binfmt
…
libfs.c
libfs: Unexport and kill simple_prepare_write
2010-03-03 13:00:17 -05:00
locks.c
Switch may_open() and break_lease() to passing O_...
2010-03-03 13:00:21 -05:00
Makefile
[LogFS] add new flash file system
2009-11-20 20:13:39 +01:00
mbcache.c
…
mpage.c
…
namei.c
Fix a dumb typo - use of & instead of &&
2010-03-06 10:54:48 -08:00
namespace.c
vfs: add NOFOLLOW flag to umount(2)
2010-03-03 14:08:00 -05:00
nfsctl.c
Switch may_open() and break_lease() to passing O_...
2010-03-03 13:00:21 -05:00
no-block.c
…
open.c
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6
2010-03-05 13:20:53 -08:00
pipe.c
fs: no games with DCACHE_UNHASHED
2009-12-17 10:51:40 -05:00
pnode.c
Kill CL_PROPAGATION, sanitize fs/pnode.c:get_source()
2010-03-03 13:00:22 -05:00
pnode.h
VFS: Clean up shared mount flag propagation
2010-03-03 14:07:55 -05:00
posix_acl.c
…
read_write.c
sendfile(): check f_op.splice_write() rather than f_op.sendpage()
2009-11-04 09:09:52 +01:00
read_write.h
…
readdir.c
…
select.c
fs: use rlimit helpers
2010-03-06 11:26:29 -08:00
seq_file.c
seq_file: fix new kernel-doc warnings
2010-03-07 15:48:26 -08:00
signalfd.c
anonfd: Allow making anon files read-only
2009-12-22 12:27:34 -05:00
splice.c
sendfile(): check f_op.splice_write() rather than f_op.sendpage()
2009-11-04 09:09:52 +01:00
stack.c
VFS/fsstack: handle 32-bit smp + preempt + large files in fsstack_copy_inode_size
2009-12-17 10:58:17 -05:00
stat.c
Add unlocked version of inode_add_bytes() function
2009-12-23 13:33:54 +01:00
super.c
Mirror MS_KERNMOUNT in ->mnt_flags
2010-03-03 14:08:00 -05:00
sync.c
quota: move code from sync_quota_sb into vfs_quota_sync
2010-03-05 00:20:24 +01:00
timerfd.c
anonfd: Allow making anon files read-only
2009-12-22 12:27:34 -05:00
utimes.c
…
xattr_acl.c
VFS: Use GFP_NOFS in posix_acl_from_xattr()
2009-12-03 11:48:07 +00:00
xattr.c
sanitize xattr handler prototypes
2009-12-16 12:16:49 -05:00