* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (34 commits)
nfsd race fixes: jfs
nfsd race fixes: reiserfs
nfsd race fixes: ext4
nfsd race fixes: ext3
nfsd race fixes: ext2
nfsd/create race fixes, infrastructure
filesystem notification: create fs/notify to contain all fs notification
fs/block_dev.c: __read_mostly improvement and sb_is_blkdev_sb utilization
kill ->dir_notify()
filp_cachep can be static in fs/file_table.c
fix f_count description in Documentation/filesystems/files.txt
make INIT_FS use the __RW_LOCK_UNLOCKED initialization
take init_fs to saner place
kill vfs_permission
pass a struct path * to may_open
kill walk_init_root
remove incorrect comment in inode_permission
expand some comments (d_path / seq_path)
correct wrong function name of d_put in kernel document and source comment
fix switch_names() breakage in short-to-short case
...
... and the same for reiserfs. The difference here is that we need
insert_inode_locked4() to match iget5_locked().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* make ext2_new_inode() put the inode into icache in locked state
* do not unlock until the inode is fully set up; otherwise nfsd
might pick it in half-baked state.
* make sure that ext2_new_inode() does *not* lead to two inodes with the
same inumber hashed at the same time; otherwise a bogus fhandle coming
from nfsd might race with inode creation:
nfsd: iget_locked() creates inode
nfsd: try to read from disk, block on that.
ext2_new_inode(): allocate inode with that inumber
ext2_new_inode(): insert it into icache, set it up and dirty
ext2_write_inode(): get the relevant part of inode table in cache,
set the entry for our inode (and start writing to disk)
nfsd: get CPU again, look into inode table, see nice and sane on-disk
inode, set the in-core inode from it
oops - we have two in-core inodes with the same inumber live in icache,
both used for IO. Welcome to fs corruption...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
new helpers - insert_inode_locked() and insert_inode_locked4().
Hash new inode, making sure that there's no such inode in icache
already. If there is and it does not end up unhashed (as would
happen if we have nfsd trying to resolve a bogus fhandle), fail.
Otherwise insert our inode into hash and succeed.
In either case have i_state set to new+locked; cleanup ends up
being simpler with such calling conventions.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Creating a generic filesystem notification interface, fsnotify, which will be
used by inotify, dnotify, and eventually fanotify is really starting to
clutter the fs directory. This patch simply moves inotify and dnotify into
fs/notify/inotify and fs/notify/dnotify respectively to make both current fs/
and future notification tidier.
Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
- iget5_locked in bdget really needs blockdev_superblock, instead of
bd_mnt, so bd_mnt could be just a local variable;
- blockdev_superblock really needs __read_mostly, while local var bd_mnt
not;
- make use of sb_is_blkdev_sb in bd_forget, instead of direct reference
to blockdev_superblock.
Signed-off-by: Denis ChengRq <crquan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Remove the hopelessly misguided ->dir_notify(). The only instance (cifs)
has been broken by design from the very beginning; the objects it creates
are never destroyed, keep references to struct file they can outlive, nothing
that could possibly evict them exists on close(2) path *and* no locking
whatsoever is done to prevent races with close(), should the previous, er,
deficiencies someday be dealt with.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Instead of creating the "filp" kmem_cache in vfs_caches_init(),
we can do it a litle be later in files_init(), so that filp_cachep
is static to fs/file_table.c
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Documentation/filesystems/files.txt was not updated when
f_count became an atomic_long_t.
atomic_long_inc_not_zero() is now used instead of atomic_inc_not_zero()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[AV: rediffed on top of unification of init_fs]
Initialization of init_fs still uses the deprecated RW_LOCK_UNLOCKED macro.
This patch updates it to use the __RW_LOCK_UNLOCKED(lock) macro.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
With all the nameidata removal there's no point anymore for this helper.
Of the three callers left two will go away with the next lookup series
anyway.
Also add proper kerneldoc to inode_permission as this is the main
permission check routine now.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
No need for the nameidata in may_open - a struct path is enough.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
walk_init_root is a tiny helper that is marked __always_inline, has just
one caller and an unused argument. Just merge it into the caller.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
We now pass on all MAY_ flags to the filesystems permission routines,
so remove the comment stating the contrary.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Explain that you really need to use the return value of d_path rather than
the buffer you passed into it.
Also fix the comment for seq_path(), the function arguments changed
recently but the comment hadn't been updated in sync.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
no function named d_put(), it should be dput().
Impact: fix document and comment, no functionality changed
Signed-off-by: Zhao Lei <zhaolei@cn.fuijtsu.com>
Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.
Cc: Sergey S. Kostyliov <rathamahata@php4.ru>
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: adilger@sun.com
Cc: linux-ext4@vger.kernel.org
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: linux-ext4@vger.kernel.org
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
On-disk data corruption could cause a page link to have its i_size set
to PAGE_SIZE (or a multiple thereof) and its contents all non-NUL.
NUL-terminate the link name to ensure this doesn't cause further
problems for the kernel.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
A number of filesystems were potentially triggering kernel bugs due to
corrupted symlink names on disk. This function helps safely terminate
the names.
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
The result from readlink is being used to index into the link name
buffer without checking whether it is a valid length. If readlink
returns an error this will fault or cause memory corruption.
Cc: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Cc: Dustin Kirkland <kirkland@canonical.com>
Cc: ecryptfs-devel@lists.launchpad.net
Signed-off-by: Duane Griffin <duaneg@dghda.com>
Acked-by: Michael Halcrow <mhalcrow@us.ibm.com>
Acked-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
The extra semicolon serves no purpose.
Signed-off-by: Julia Lawall <julia@diku.dk>
Reviewed-by: Richard Genoud <richard.genoud@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
include/linux/fs.h contains externs for a bunch of variables. That obviously
belongs under ifdef __KERNEL__.
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
struct dentry is one of the most critical structures in the kernel. So it's
sad to see it going neglected.
With CONFIG_PROFILING turned on (which is probably the common case at least
for distros and kernel developers), sizeof(struct dcache) == 208 here
(64-bit). This gives 19 objects per slab.
I packed d_mounted into a hole, and took another 4 bytes off the inline
name length to take the padding out from the end of the structure. This
shinks it to 200 bytes. I could have gone the other way and increased the
length to 40, but I'm aiming for a magic number, read on...
I then got rid of the d_cookie pointer. This shrinks it to 192 bytes. Rant:
why was this ever a good idea? The cookie system should increase its hash
size or use a tree or something if lookups are a problem. Also the "fast
dcookie lookups" in oprofile should be moved into the dcookie code -- how
can oprofile possibly care about the dcookie_mutex? It gets dropped after
get_dcookie() returns so it can't be providing any sort of protection.
At 192 bytes, 21 objects fit into a 4K page, saving about 3MB on my system
with ~140 000 entries allocated. 192 is also a multiple of 64, so we get
nice cacheline alignment on 64 and 32 byte line systems -- any given dentry
will now require 3 cachelines to touch all fields wheras previously it
would require 4.
I know the inline name size was chosen quite carefully, however with the
reduction in cacheline footprint, it should actually be just about as fast
to do a name lookup for a 36 character name as it was before the patch (and
faster for other sizes). The memory footprint savings for names which are
<= 32 or > 36 bytes long should more than make up for the memory cost for
33-36 byte names.
Performance is a feature...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Reorder struct inotify_device to remove 8 bytes of padding on 64bit
builds, reducing size to 128 bytes . Therefore allocating from a smaller
slab & using one fewer cachelines.
Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
----
Hi,
patch against 2.6.28-rc7.
built & tested on AMDX2 desktop.
I've not been able to send this to the listed inotify maintainers, I
just get mail failures. So I guessed filesystem was the best home for
it, hope that's ok.
regards
Richard
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Add new LSM hooks for path-based checks. Call them on directory-modifying
operations at the points where we still know the vfsmount involved.
Signed-off-by: Kentaro Takeda <takedakn@nttdata.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@nttdata.co.jp>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* 'irq-fixes-for-linus-4' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
sparseirq: move __weak symbols into separate compilation unit
sparseirq: work around __weak alias bug
sparseirq: fix hang with !SPARSE_IRQ
sparseirq: set lock_class for legacy irq when sparse_irq is selected
sparseirq: work around compiler optimizing away __weak functions
sparseirq: fix desc->lock init
sparseirq: do not printk when migrating IRQ descriptors
sparseirq: remove duplicated arch_early_irq_init()
irq: simplify for_each_irq_desc() usage
proc: remove ifdef CONFIG_SPARSE_IRQ from stat.c
irq: for_each_irq_desc() move to irqnr.h
hrtimer: remove #include <linux/irq.h>
* git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6:
fat: make sure to set d_ops in fat_get_parent
fat: fix duplicate addition of ->llseek handler
fat: drop negative dentry on rename() path
* 'for-linus' of git://oss.sgi.com/xfs/xfs: (184 commits)
[XFS] Fix race in xfs_write() between direct and buffered I/O with DMAPI
[XFS] handle unaligned data in xfs_bmbt_disk_get_all
[XFS] avoid memory allocations in xfs_fs_vcmn_err
[XFS] Fix speculative allocation beyond eof
[XFS] Remove XFS_BUF_SHUT() and friends
[XFS] Use the incore inode size in xfs_file_readdir()
[XFS] set b_error from bio error in xfs_buf_bio_end_io
[XFS] use inode_change_ok for setattr permission checking
[XFS] add a FMODE flag to make XFS invisible I/O less hacky
[XFS] resync headers with libxfs
[XFS] simplify projid check in xfs_rename
[XFS] replace b_fspriv with b_mount
[XFS] Remove unused tracing code
[XFS] Remove unnecessary assertion
[XFS] Remove unused variable in ktrace_free()
[XFS] Check return value of xfs_buf_get_noaddr()
[XFS] Fix hang after disallowed rename across directory quota domains
[XFS] Fix compile with CONFIG_COMPAT enabled
move inode tracing out of xfs_vnode.
move vn_iowait / vn_iowake into xfs_aops.c
...
* git://git.linux-nfs.org/projects/trondmy/nfs-2.6: (70 commits)
fs/nfs/nfs4proc.c: make nfs4_map_errors() static
rpc: add service field to new upcall
rpc: add target field to new upcall
nfsd: support callbacks with gss flavors
rpc: allow gss callbacks to client
rpc: pass target name down to rpc level on callbacks
nfsd: pass client principal name in rsc downcall
rpc: implement new upcall
rpc: store pointer to pipe inode in gss upcall message
rpc: use count of pipe openers to wait for first open
rpc: track number of users of the gss upcall pipe
rpc: call release_pipe only on last close
rpc: add an rpc_pipe_open method
rpc: minor gss_alloc_msg cleanup
rpc: factor out warning code from gss_pipe_destroy_msg
rpc: remove unnecessary assignment
NFS: remove unused status from encode routines
NFS: increment number of operations in each encode routine
NFS: fix comment placement in nfs4xdr.c
NFS: fix tabs in nfs4xdr.c
...
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
IB/mlx4: Fix reading SL field out of cqe->sl_vid
RDMA/addr: Fix build breakage when IPv6 is disabled
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (583 commits)
V4L/DVB (10130): use USB API functions rather than constants
V4L/DVB (10129): dvb: remove deprecated use of RW_LOCK_UNLOCKED in frontends
V4L/DVB (10128): modify V4L documentation to be a valid XHTML
V4L/DVB (10127): stv06xx: Avoid having y unitialized
V4L/DVB (10125): em28xx: Don't do AC97 vendor detection for i2s audio devices
V4L/DVB (10124): em28xx: expand output formats available
V4L/DVB (10123): em28xx: fix reversed definitions of I2S audio modes
V4L/DVB (10122): em28xx: don't load em28xx-alsa for em2870 based devices
V4L/DVB (10121): em28xx: remove worthless Pinnacle PCTV HD Mini 80e device profile
V4L/DVB (10120): em28xx: remove redundant Pinnacle Dazzle DVC 100 profile
V4L/DVB (10119): em28xx: fix corrupted XCLK value
V4L/DVB (10118): zoran: fix warning for a variable not used
V4L/DVB (10116): af9013: Fix gcc false warnings
V4L/DVB (10111a): usbvideo.h: remove an useless blank line
V4L/DVB (10111): quickcam_messenger.c: fix a warning
V4L/DVB (10110): v4l2-ioctl: Fix warnings when using .unlocked_ioctl = __video_ioctl2
V4L/DVB (10109): anysee: Fix usage of an unitialized function
V4L/DVB (10104): uvcvideo: Add support for video output devices
V4L/DVB (10102): uvcvideo: Ignore interrupt endpoint for built-in iSight webcams.
V4L/DVB (10101): uvcvideo: Fix bulk URB processing when the header is erroneous
...
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
net: Fix percpu counters deadlock
cpumask: prepare for iterators to only go to nr_cpu_ids/nr_cpumask_bits: net
drivers/net/usb: use USB API functions rather than constants
cls_cgroup: clean up Kconfig
cls_cgroup: clean up for cgroup part
cls_cgroup: fix an oops when removing a cgroup
EtherExpress16: fix printing timed out status
mlx4_en: Added "set_ringparam" Ethtool interface implementation
mlx4_en: Always allocate RX ring for each interrupt vector
mlx4_en: Verify number of RX rings doesn't exceed MAX_RX_RINGS
IPVS: Make "no destination available" message more consistent between schedulers
net: KS8695: removed duplicated #include
tun: Fix SIOCSIFHWADDR error.
smsc911x: compile fix re netif_rx signature changes
netns: foreach_netdev_safe is insufficient in default_device_exit
net: make xfrm_statistics_seq_show use generic snmp_fold_field
net: Fix more NAPI interface netdev argument drop fallout.
net: Fix unused variable warnings in pasemi_mac.c and spider_net.c
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
lguest: struct device - replace bus_id with dev_name()
lguest: move the initial guest page table creation code to the host
kvm-s390: implement config_changed for virtio on s390
virtio_console: support console resizing
virtio: add PCI device release() function
virtio_blk: fix type warning
virtio: block: dynamic maximum segments
virtio: set max_segment_size and max_sectors to infinite.
virtio: avoid implicit use of Linux page size in balloon interface
virtio: hand virtio ring alignment as argument to vring_new_virtqueue
virtio: use KVM_S390_VIRTIO_RING_ALIGN instead of relying on pagesize
virtio: use LGUEST_VRING_ALIGN instead of relying on pagesize
virtio: Don't use PAGE_SIZE for vring alignment in virtio_pci.
virtio: rename 'pagesize' arg to vring_init/vring_size
virtio: Don't use PAGE_SIZE in virtio_pci.c
virtio: struct device - replace bus_id with dev_name(), dev_set_name()
virtio-pci queue allocation not page-aligned
* 'devel' of master.kernel.org:/home/rmk/linux-2.6-arm: (407 commits)
[ARM] pxafb: add support for overlay1 and overlay2 as framebuffer devices
[ARM] pxafb: cleanup of the timing checking code
[ARM] pxafb: cleanup of the color format manipulation code
[ARM] pxafb: add palette format support for LCCR4_PAL_FOR_3
[ARM] pxafb: add support for FBIOPAN_DISPLAY by dma braching
[ARM] pxafb: allow pxafb_set_par() to start from arbitrary yoffset
[ARM] pxafb: allow video memory size to be configurable
[ARM] pxa: add document on the MFP design and how to use it
[ARM] sa1100_wdt: don't assume CLOCK_TICK_RATE to be a constant
[ARM] rtc-sa1100: don't assume CLOCK_TICK_RATE to be a constant
[ARM] pxa/tavorevb: update board support (smartpanel LCD + keypad)
[ARM] pxa: Update eseries defconfig
[ARM] 5352/1: add w90p910-plat config file
[ARM] s3c: S3C options should depend on PLAT_S3C
[ARM] mv78xx0: implement GPIO and GPIO interrupt support
[ARM] Kirkwood: implement GPIO and GPIO interrupt support
[ARM] Orion: share GPIO IRQ handling code
[ARM] Orion: share GPIO handling code
[ARM] s3c: define __io using the typesafe version
[ARM] S3C64XX: Ensure CPU_V6 is selected
...
* git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6: (33 commits)
ide-cd: remove dead dsc_overlap setting
ide: push local_irq_{save,restore}() to do_identify()
ide: remove superfluous local_irq_{save,restore}() from ide_dump_status()
ide: move legacy ISA/VLB ports handling to ide-legacy.c (v2)
ide: move Power Management support to ide-pm.c
ide: use ATA_DMA_* defines in ide-dma-sff.c
ide: checkpatch.pl fixes for ide-lib.c
ide: remove inline tags from ide-probe.c
ide: remove redundant code from ide_end_drive_cmd()
ide: struct device - replace bus_id with dev_name(), dev_set_name()
ide: rework handling of serialized ports (v2)
cy82c693: remove superfluous ide_cy82c693 chipset type
trm290: add IDE_HFLAG_TRM290 host flag
ide: add ->max_sectors field to struct ide_port_info
rz1000: apply chipset quirks early (v2)
ide: always set nIEN on idle devices
ide: fix ->quirk_list checking in ide_do_request()
gayle: set IDE_HFLAG_SERIALIZE explictly
cmd64x: set IDE_HFLAG_SERIALIZE explictly for CMD646
ali14xx: doesn't use shared IRQs
...
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
sata_sil: add Large Block Transfer support
[libata] ata_piix: cleanup dmi strings checking
DMI: add dmi_match
libata: blacklist NCQ on OCZ CORE 2 SSD (resend)
[libata] Update kernel-doc comments to match source code
libata: perform port detach in EH
libata: when restoring SControl during detach do the PMP links first
libata: beef up iterators
