Jonathan Brassow [Tue, 24 Apr 2012 00:57:59 +0000 (10:57 +1000)]
DM RAID: Use md_error() in place of simply setting Faulty bit
When encountering an error while reading the superblock, call md_error.
We are currently setting the 'Faulty' bit on one of the array devices when an
error is encountered while reading the superblock of a dm-raid array. We should
be calling md_error(), as it handles the error more completely.
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: NeilBrown <neilb@suse.de>
Jonathan Brassow [Tue, 24 Apr 2012 00:57:59 +0000 (10:57 +1000)]
DM RAID: Record and handle missing devices
Missing dm-raid devices should be recorded in the superblock
When specifying the devices that compose a DM RAID array, it is possible to denote
failed or missing devices with '-'s. When this occurs, we must record this in the
superblock. We do this by checking if the array position's data device is missing
and then forcing MD to record the superblock by setting 'MD_CHANGE_DEVS' in
'raid_resume'. If we do not cause the superblock to be rewritten by the resume
function, it is possible for a stale superblock to be written by an out-going
in-active table (during 'raid_dtr').
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: NeilBrown <neilb@suse.de>
Jonathan Brassow [Tue, 24 Apr 2012 00:57:59 +0000 (10:57 +1000)]
DM RAID: Set recovery flags on resume
Properly initialize MD recovery flags when resuming device-mapper devices.
When a device-mapper device is suspended, all I/O must stop. This is done by
calling 'md_stop_writes' and 'mddev_suspend'. These calls in-turn manipulate
the recovery flags - including setting 'MD_RECOVERY_FROZEN'. The DM device
may have been suspended while recovery was not yet complete, so the process
needs to pick-up where it left off. Since 'mddev_resume' does not unset
'MD_RECOVERY_FROZEN' and set 'MD_RECOVERY_NEEDED', we must do it ourselves.
'MD_RECOVERY_NEEDED' can safely be set in 'mddev_resume', but 'MD_RECOVERY_FROZEN'
must be set outside of 'mddev_resume' due to how MD handles RAID reshaping.
(e.g. It is possible for a user to delay reshaping a RAID5->RAID6 by purposefully
setting 'MD_RECOVERY_FROZEN'. Clearing it in 'mddev_resume' would override the
desired behavior.)
Because 'mddev_resume' already unconditionally calls 'md_wakeup_thread(mddev->thread)'
there is no need to make this call from 'raid_resume' since it calls 'mddev_resume'.
Also clean up where level_store calls mddev_resume() - it current
duplicates some of the funcitons of that call. - NB
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: NeilBrown <neilb@suse.de>
There is no real value in freeing things the moment there is an error.
It is just as good to free the bitmap file and pages when the bitmap
is explicitly removed (and replaced?) or at shutdown.
With this gone, the bitmap will only disappear when the array is
quiescent, so we can remove some locking.
As the 'filemap' doesn't disappear now, include extra checks before
trying to write any of it out.
Also remove the check for "has it disappeared" in
bitmap_daemon_write().
md/bitmap: use set_bit, test_bit, etc for operation on bitmap->flags.
We currently use '&' and '|' which isn't the norm in the kernel
and doesn't allow easy atomicity.
So change to bit numbers and {set,clear,test}_bit.
This allows us to remove a spinlock/unlock (which was dubious anyway)
and some other simplifications.
md/bitmap: remove single-bit manipulation on sb->state
Just do single-bit manipulations on bitmap->flags and copy whole
value between that and sb->state.
This will allow next patch which changes how bit manipulations are
performed on bitmap->flags.
This does result in BITMAP_STALE not being set in sb by
bitmap_read_sb, however as the setting is determined by other
information in the 'sb' we do not lose information this way.
Normally, bitmap_load will be called shortly which will clear
BITMAP_STALE anyway.
This function isn't really needed. It sets or clears a flag in both
bitmap->flags and sb->state.
However both times it is called, bitmap_update_sb is called soon
afterwards which copies bitmap->flags to sb->state.
So just make changes to bitmap->flags, and open-code those rather than
hiding in a function.
md/bitmap: move some fields of 'struct bitmap' into a 'storage' substruct.
This new 'struct bitmap_storage' reflects the external storage of the
bitmap.
Having this clearly defined will make it easier to change the storage
used while the array is active.
md/bitmap: change *_page_attr() to take a page number, not a page.
Most often we have the page number, not the page. And that is what
the *_page_attr() functions really want. So change the arguments to
take that number.
md/bitmap: centralise allocation of bitmap file pages.
Instead of allocating pages in read_sb_page, read_page and
bitmap_read_sb, allocate them all in bitmap_init_from disk.
Also replace the hack of calling "attach_page_buffers(page, NULL)" to
ensure that free_buffer() won't complain, by putting a test for
PagePrivate in free_buffer().
md/bitmap: allow a bitmap with no backing storage.
An md bitmap comprises two parts
- internal counting of active writes per 'chunk'.
- external storage of whether there are any active writes on
each chunk
The second requires the first, but the first doesn't require the
second.
Not having backing storage means that the bitmap cannot expedite
resync after a crash, but it still allows us to expedite the recovery
of a recently-removed device.
So: allow a bitmap to exist even if there is no backing device.
In that case we default to 128M chunks.
A particular value of this is that we can remove and re-add a bitmap
(possibly of a different granularity) on a degraded array, and not
lose the information needed to fast-recover the missing device.
We don't actually activate these bitmaps yet - that will come
in a later patch.
md/bitmap: disentangle two different 'pending' flags.
There are two different 'pending' concepts in the handling of the
write intent bitmap.
Firstly, a 'page' from the bitmap (which container PAGE_SIZE*8 bits)
may have changes (bits cleared) that should be written in due course.
There is no hurry for these and the page will transition from
PENDING to NEEDWRITE and will then be written, though if it ever
becomes DIRTY it will be written much sooner and PENDING will be
cleared.
Secondly, a page of counters - which contains PAGE_SIZE/2 counters, one
for each bit, can usefully have a 'pending' flag which indicates if
any of the counters are low (2 or 1) and ready to be processed by
bitmap_daemon_work(). If this flag is clear we can skip the whole
page.
These two concepts are currently combined in the bitmap-file flag.
This causes a tighter connection between the counters and the bitmap
file than I would like - as I want to add some flexibility to the
bitmap file.
So introduce a new flag with the page-of-counters, and rewrite
bitmap_daemon_work() so that it handles the two different 'pending'
concepts separately.
This also allows us to clear BITMAP_PAGE_PENDING when we write out
a dirty page, which may occasionally reduce the number of times we
write a page.
md/raid1: allow fix_read_error to read from recovering device.
When attempting to fix a read error, it is acceptable to read from a
device that is recovering, provided the recovery has got past the
place we are reading from. This makes the test for "can we read from
here" the same as the test in read_balance.
md: dm-raid should call helper function to clear rdev.
dm-raid currently open-codes the freeing of some members of
and rdev. It is more maintainable to have it call common code
from md.c which does this for all call-sites.
So remove free_disk_sb to md_rdev_clear, export it, and use it in
dm-raid.c
Jim Kukunas [Tue, 24 Apr 2012 00:57:49 +0000 (10:57 +1000)]
crypto: disable preemption while benchmarking RAID5 xor checksumming
With CONFIG_PREEMPT=y, we need to disable preemption while benchmarking
RAID5 xor checksumming to ensure we're actually measuring what we think
we're measuring.
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
Jim Kukunas [Tue, 24 Apr 2012 00:57:49 +0000 (10:57 +1000)]
crypto: wait for a full jiffy in do_xor_speed
In the existing do_xor_speed(), there is no guarantee that we actually
run do_2() for a full jiffy. We get the current jiffy, then run do_2()
until the next jiffy.
Instead, let's get the current jiffy, then wait until the next jiffy
to start our test.
Signed-off-by: Jim Kukunas <james.t.kukunas@linux.intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
A 'near' or 'offset' lay RAID10 array can be reshaped to a different
'near' or 'offset' layout, a different chunk size, and a different
number of devices.
However the number of copies cannot change.
Unlike RAID5/6, we do not support having user-space backup data that
is being relocated during a 'critical section'. Rather, the
data_offset of each device must change so that when writing any block
to a new location, it will not over-write any data that is still
'live'.
This means that RAID10 reshape is not supportable on v0.90 metadata.
The different between the old data_offset and the new_offset must be
at least the larger of the chunksize multiplied by offset copies of
each of the old and new layout. (for 'near' mode, offset_copies == 1).
A larger difference of around 64M seems useful for in-place reshapes
as more data can be moved between metadata updates.
Very large differences (e.g. 512M) seem to slow the process down due
to lots of long seeks (on oldish consumer graded devices at least).
Metadata needs to be updated whenever the place we are about to write
to is considered - by the current metadata - to still contain data in
the old layout.
md/raid10: Introduce 'prev' geometry to support reshape.
When RAID10 supports reshape it will need a 'previous' and a 'current'
geometry, so introduce that here.
Use the 'prev' geometry when before the reshape_position, and the
current 'geo' when beyond it. At other times, use both as
appropriate.
For now, both are identical (And reshape_position is never set).
When we use the 'prev' geometry, we must use the old data_offset.
When we use the current (And a reshape is happening) we must use
the new_data_offset.
md: use resync_max_sectors for reshape as well as resync.
Some resync type operations need to act on the address space of the
device, others on the address space of the array.
This only affects RAID10, so it sets resync_max_sectors to the array
size (it defaults to the device size), and that is currently used for
resync only. However reshape of a RAID10 must be done against the
array size, not device size, so change code to use resync_max_sectors
for both the resync and the reshape cases.
This does not affect RAID5 or RAID1, just RAID10.
Some code in raid1 and raid10 use sync_page_io to
read/write pages when responding to read errors.
As we will shortly support changing data_offset for
raid10, this function must understand new_data_offset.
md/raid10: collect some geometry fields into a dedicated structure.
We will shortly be adding reshape support for RAID10 which will
require it having 2 concurrent geometries (before and after).
To make that easier, collect most geometry fields into 'struct geom'
and access them from there. Then we will more easily be able to add
a second set of fields.
Note that 'copies' is not in this struct and so cannot be changed.
There is little need to change this number and doing so is a lot
more difficult as it requires reallocating more things.
So leave it out for now.
md/raid5: allow for change in data_offset while managing a reshape.
The important issue here is incorporating the different in data_offset
into calculations concerning when we might need to over-write data
that is still thought to be valid.
To this end we find the minimum offset difference across all devices
and add that where appropriate.
md: add possibility to change data-offset for devices.
When reshaping we can avoid costly intermediate backup by
changing the 'start' address of the array on the device
(if there is enough room).
So as a first step, allow such a change to be requested
through sysfs, and recorded in v1.x metadata.
(As we didn't previous check that all 'pad' fields were zero,
we need a new FEATURE flag for this.
A (belatedly) check that all remaining 'pad' fields are
zero to avoid a repeat of this)
The new data offset must be requested separately for each device.
This allows each to have a different change in the data offset.
This is not likely to be used often but as data_offset can be
set per-device, new_data_offset should be too.
This patch also removes the 'acknowledged' arg to rdev_set_badblocks as
it is never used and never will be. At the same time we add a new
arg ('in_new') which is currently always zero but will be used more
soon.
When a reshape finishes we will need to update the data_offset
and rdev->sectors. So provide an exported function to do that.
Currently a reshape operation always progresses from the start
of the array to the end unless the number of devices is being
reduced, in which case it progressed in the opposite direction.
To reverse a partial reshape which changes the number of devices
you can stop the array and re-assemble with the raid-disks numbers
reversed and it will undo.
However for a reshape that does not change the number of devices
it is not possible to reverse the reshape in the middle - you have to
wait until it completes.
So add a 'reshape_direction' attribute with is either 'forwards' or
'backwards' and can be explicitly set when delta_disks is zero.
This will become more important when we allow the data_offset to
change in a reshape. Then the explicit statement of what direction is
being used will be more useful.
This can be enabled in raid5 trivially as it already supports
reverse reshape and just needs to use a different trigger to request it.
removed the possibility of a 'BUG' when data is written to an array
that has just been switched to read-only, but also introduced the
possibility that the array metadata could be corrupted.
If, when md_notify_reboot gets the mddev lock, the array is
in a state where it is assembled but hasn't been started (as can
happen if the personality module is not available, or in other unusual
situations), then incorrect metadata will be written out making it
impossible to re-assemble the array.
So only call __md_stop_writes() if the array has actually been
activated.
This patch is needed for any stable kernel which has had the above
commit applied.
Cc: stable@vger.kernel.org Reported-by: Christoph Nelles <evilazrael@evilazrael.de> Signed-off-by: NeilBrown <neilb@suse.de>
md/raid5: If there is a spare and a want_replacement device, start replacement.
cause md_check_recovery to call ->add_disk much more often.
Instead of only when the array is degraded, it is now called whenever
md_check_recovery finds anything useful to do, which includes
updating the metadata for clean<->dirty transition.
This causes unnecessary work, and causes info messages from ->add_disk
to be reported much too often.
So refine md_check_recovery to only do any actual recovery checking
(including ->add_disk) if MD_RECOVERY_NEEDED is set.
This fix is suitable for 3.3.y:
Cc: stable@vger.kernel.org Reported-by: Jan Ceuleers <jan.ceuleers@computer.org> Signed-off-by: NeilBrown <neilb@suse.de>
md/bitmap: prevent bitmap_daemon_work running while initialising bitmap
If a bitmap is added while the array is active, it is possible
for bitmap_daemon_work to run while the bitmap is being
initialised.
This is particularly a problem if bitmap_daemon_work sees
bitmap->filemap as non-NULL before it has been filled in properly.
So hold bitmap_info.mutex while filling in ->filemap
to prevent problems.
This patch is suitable for any -stable kernel, though it might not
apply cleanly before about 3.1.
md/raid1,raid10: don't compare excess byte during consistency check.
When comparing two pages read from different legs of a mirror, only
compare the bytes that were read, not the whole page.
In most cases we read a whole page, but in some cases with
bad blocks or odd sizes devices we might read fewer than that.
This bug has been present "forever" but at worst it might cause
a report of two many mismatches and generate a little bit
extra resync IO, so there is no need to back-port to -stable
kernels.
md/raid5: Fix a bug about judging if the operation is syncing or replacing
When create a raid5 using assume-clean and echo check or repair to
sync_action.Then component disks did not operated IO but the raid
check/resync faster than normal.
Because the judgement in function analyse_stripe():
if (do_recovery ||
sh->sector >= conf->mddev->recovery_cp)
s->syncing = 1;
else
s->replacing = 1;
When check or repair,the recovery_cp == MaxSectore,so syncing equal zero
not one.
This bug was introduced by commit 9a3e1101b827
md/raid5: detect and handle replacements during recovery.
so this patch is suitable for 3.3-stable.
raid1 arrays do not have the notion of chunk size. Calculate the
largest chunk sector size we can use to avoid a divide by zero OOPS
when aligning the size of the new array to the chunk size.
md/raid5: fix handling of bad blocks during recovery.
1/ We can only treat a known-bad-block like a read-error if we
have the data that belongs in that block. So fix that test.
2/ If we cannot recovery a stripe due to insufficient data,
don't tell "md_done_sync" that the sync failed unless we really
did fail something. If we successfully record bad blocks,
that is success.
Linus Torvalds [Sat, 31 Mar 2012 22:11:39 +0000 (15:11 -0700)]
Merge branch 's3-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/amit/virtio-console
Pull virtio S3 support patches from Amit Shah:
"Turns out S3 is not different from S4 for virtio devices: the device
is assumed to be reset, so the host and guest state are to be assumed
to be out of sync upon resume. We handle the S4 case with exactly the
same scenario, so just point the suspend/resume routines to the
freeze/restore ones.
Once that is done, we also use the PM API's macro to initialise the
sleep functions.
A couple of cleanups are included: there's no need for special thaw
processing in the balloon driver, so that's addressed in patches 1 and
2.
Testing: both S3 and S4 support have been tested using these patches
using a similar method used earlier during S4 patch development: a
guest is started with virtio-blk as the only disk, a virtio network
card, a virtio-serial port and a virtio balloon device. Ping from
guest to host, dd /dev/zero to a file on the disk, and IO from the
host on the virtio-serial port, all at once, while exercising S4 and
S3 (separately) were tested. They all continue to work fine after
resume. virtio balloon values too were tested by inflating and
deflating the balloon."
Pulling from Amit, since Rusty is off getting married (and presumably
shaving people).
* 's3-for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/amit/virtio-console:
virtio-pci: switch to PM ops macro to initialise PM functions
virtio-pci: S3 support
virtio-pci: drop restore_common()
virtio: drop thaw PM operation
virtio: balloon: Allow stats update after restore from S4
Linus Torvalds [Sat, 31 Mar 2012 20:42:57 +0000 (13:42 -0700)]
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull second try at vfs part d#2 from Al Viro:
"Miklos' first series (with do_lookup() rewrite split into edible
chunks) + assorted bits and pieces.
The 'untangling of do_lookup()' series is is a splitup of what used to
be a monolithic patch from Miklos, so this series is basically "how do
I convince myself that his patch is correct (or find a hole in it)".
No holes found and I like the resulting cleanup, so in it went..."
Changes from try 1: Fix a boot problem with selinux, and commit messages
prettied up a bit.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (24 commits)
vfs: fix out-of-date dentry_unhash() comment
vfs: split __lookup_hash
untangling do_lookup() - take __lookup_hash()-calling case out of line.
untangling do_lookup() - switch to calling __lookup_hash()
untangling do_lookup() - merge d_alloc_and_lookup() callers
untangling do_lookup() - merge failure exits in !dentry case
untangling do_lookup() - massage !dentry case towards __lookup_hash()
untangling do_lookup() - get rid of need_reval in !dentry case
untangling do_lookup() - eliminate a loop.
untangling do_lookup() - expand the area under ->i_mutex
untangling do_lookup() - isolate !dentry stuff from the rest of it.
vfs: move MAY_EXEC check from __lookup_hash()
vfs: don't revalidate just looked up dentry
vfs: fix d_need_lookup/d_revalidate order in do_lookup
ext3: move headers to fs/ext3/
migrate ext2_fs.h guts to fs/ext2/ext2.h
new helper: ext2_image_size()
get rid of pointless includes of ext2_fs.h
ext2: No longer export ext2_fs.h to user space
mtdchar: kill persistently held vfsmount
...
Linus Torvalds [Sat, 31 Mar 2012 20:35:31 +0000 (13:35 -0700)]
Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Ingo Molnar.
* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched: Fix incorrect usage of for_each_cpu_mask() in select_fallback_rq()
sched: Fix __schedule_bug() output when called from an interrupt
sched/arch: Introduce the finish_arch_post_lock_switch() scheduler callback
So, those who wish to specify raw events can now use the following
event format:
-e cpu/cmask=1,event=2,umask=3
Most people will not want to specify any events (let alone raw
events), they'll just use whatever default event the tools use.
But for more obscure PMU events that have no cross-architecture
generic events the above syntax is more usable and a bit more
structured than specifying hex numbers."
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (41 commits)
perf tools: Remove auto-generated bison/flex files
perf annotate: Fix off by one symbol hist size allocation and hit accounting
perf tools: Add missing ref-cycles event back to event parser
perf annotate: addr2line wants addresses in same format as objdump
perf probe: Finder fails to resolve function name to address
tracing: Fix ent_size in trace output
perf symbols: Handle NULL dso in dso__name_len
perf symbols: Do not include libgen.h
perf tools: Fix bug in raw sample parsing
perf tools: Fix display of first level of callchains
perf tools: Switch module.h into export.h
perf: Move mmap page data_head offset assertion out of header
perf: Fix mmap_page capabilities and docs
perf diff: Fix to work with new hists design
perf tools: Fix modifier to be applied on correct events
perf tools: Fix various casting issues for 32 bits
perf tools: Simplify event_read_id exit path
tracing: Fix ftrace stack trace entries
tracing: Move the tracing_on/off() declarations into CONFIG_TRACING
perf report: Add a simple GTK2-based 'perf report' browser
...
Linus Torvalds [Sat, 31 Mar 2012 20:32:30 +0000 (13:32 -0700)]
Merge tag 'parisc-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/parisc-2.6
Pull PARISC misc updates from James Bottomley:
"This is a couple of minor updates (fixing lws futex locking and
removing some obsolete cpu_*_map calls)."
* tag 'parisc-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/parisc-2.6:
[PARISC] remove references to cpu_*_map.
[PARISC] futex: Use same lock set as lws calls
Linus Torvalds [Sat, 31 Mar 2012 20:31:23 +0000 (13:31 -0700)]
Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
Pull SCSI updates from James Bottomley:
"This is primarily another round of driver updates (lpfc, bfa, fcoe,
ipr) plus a new ufshcd driver. There shouldn't be anything
controversial in here (The final deletion of scsi proc_ops which
caused some build breakage has been held over until the next merge
window to give us more time to stabilise it).
I'm afraid, with me moving continents at exactly the wrong time,
anything submitted after the merge window opened has been held over to
the next merge window."
* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (63 commits)
[SCSI] ipr: Driver version 2.5.3
[SCSI] ipr: Increase alignment boundary of command blocks
[SCSI] ipr: Increase max concurrent oustanding commands
[SCSI] ipr: Remove unnecessary memory barriers
[SCSI] ipr: Remove unnecessary interrupt clearing on new adapters
[SCSI] ipr: Fix target id allocation re-use problem
[SCSI] atp870u, mpt2sas, qla4xxx use pci_dev->revision
[SCSI] fcoe: Drop the rtnl_mutex before calling fcoe_ctlr_link_up
[SCSI] bfa: Update the driver version to 3.0.23.0
[SCSI] bfa: BSG and User interface fixes.
[SCSI] bfa: Fix to avoid vport delete hang on request queue full scenario.
[SCSI] bfa: Move service parameter programming logic into firmware.
[SCSI] bfa: Revised Fabric Assigned Address(FAA) feature implementation.
[SCSI] bfa: Flash controller IOC pll init fixes.
[SCSI] bfa: Serialize the IOC hw semaphore unlock logic.
[SCSI] bfa: Modify ISR to process pending completions
[SCSI] bfa: Add fc host issue lip support
[SCSI] mpt2sas: remove extraneous sas_log_info messages
[SCSI] libfc: fcoe_transport_create fails in single-CPU environment
[SCSI] fcoe: reduce contention for fcoe_rx_list lock [v2]
...
Al Viro [Fri, 30 Mar 2012 18:18:50 +0000 (14:18 -0400)]
untangling do_lookup() - get rid of need_reval in !dentry case
Everything arriving into if (!dentry) will have need_reval = 1.
Indeed, the only way to get there with need_reval reset to 0 would
be via
if (unlikely(d_need_lookup(dentry)))
goto unlazy;
if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE)) {
status = d_revalidate(dentry, nd);
if (unlikely(status <= 0)) {
if (status != -ECHILD)
need_reval = 0;
goto unlazy;
...
unlazy:
/* no assignments to dentry */
if (dentry && unlikely(d_need_lookup(dentry))) {
dput(dentry);
dentry = NULL;
}
and if d_need_lookup() had already been false the first time around, it
will remain false on the second call as well.
Al Viro [Fri, 30 Mar 2012 18:13:15 +0000 (14:13 -0400)]
untangling do_lookup() - eliminate a loop.
d_lookup() *will* fail after successful d_invalidate(), if we are
holding i_mutex all along. IOW, we don't need to jump back to
l: - we know what path will be taken there and can do that (i.e.
d_alloc_and_lookup()) directly.
Al Viro [Fri, 30 Mar 2012 18:04:16 +0000 (14:04 -0400)]
untangling do_lookup() - isolate !dentry stuff from the rest of it.
Duplicate the revalidation-related parts into if (!dentry) branch.
Next step will be to pull them under i_mutex.
This and the next 8 commits are more or less a splitup of patch
by Miklos; folks, when you are working with something that convoluted,
carve your patches up into easily reviewed steps, especially when
a lot of codepaths involved are rarely hit...
Al Viro [Fri, 23 Mar 2012 20:36:45 +0000 (16:36 -0400)]
new helper: ext2_image_size()
... implemented that way since the next commit will leave it
almost alone in ext2_fs.h - most of the file (including
struct ext2_super_block) is going to move to fs/ext2/ext2.h.
Thierry Reding [Fri, 23 Mar 2012 09:27:36 +0000 (10:27 +0100)]
ext2: No longer export ext2_fs.h to user space
Since the on-disk format has been stable for quite some time, users
should either use the headers provided by libext2fs or keep a private
copy of this header. For the full discussion, see this thread:
https://lkml.org/lkml/2012/3/21/516
While at it, this commit removes all __KERNEL__ guards, which are now
unnecessary.
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Jan Kara <jack@suse.cz> Cc: Ted Ts'o <tytso@mit.edu> Cc: Artem Bityutskiy <dedekind1@gmail.com> Cc: Andreas Dilger <aedilger@gmail.com> Cc: linux-ext4@vger.kernel.org
Al Viro [Fri, 23 Mar 2012 17:47:52 +0000 (13:47 -0400)]
mtdchar: kill persistently held vfsmount
... and mtdchar_notifier along with it; just have ->drop_inode() that
will unconditionally get evict them instead of dances on mtd device
removal and use simple_pin_fs() instead of kern_mount()
Matthew Garrett [Tue, 27 Mar 2012 14:17:41 +0000 (10:17 -0400)]
ASPM: Fix pcie devices with non-pcie children
Since 3.2.12 and 3.3, some systems are failing to boot with a BUG_ON.
Some other systems using the pata_jmicron driver fail to boot because no
disks are detected. Passing pcie_aspm=force on the kernel command line
works around it.
The cause: commit 4949be16822e ("PCI: ignore pre-1.1 ASPM quirking when
ASPM is disabled") changed the behaviour of pcie_aspm_sanity_check() to
always return 0 if aspm is disabled, in order to avoid cases where we
changed ASPM state on pre-PCIe 1.1 devices.
This skipped the secondary function of pcie_aspm_sanity_check which was
to avoid us enabling ASPM on devices that had non-PCIe children, causing
trouble later on. Move the aspm_disabled check so we continue to honour
that scenario.
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=42979 and
http://bugs.debian.org/665420
Reported-by: Romain Francoise <romain@orebokech.com> # kernel panic Reported-by: Chris Holland <bandidoirlandes@gmail.com> # disk detection trouble Signed-off-by: Matthew Garrett <mjg@redhat.com> Cc: stable@vger.kernel.org Tested-by: Hatem Masmoudi <hatem.masmoudi@gmail.com> # Dell Latitude E5520 Tested-by: janek <jan0x6c@gmail.com> # pata_jmicron with JMB362/JMB363
[jn: with more symptoms in log message] Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Linus Torvalds [Sat, 31 Mar 2012 18:12:57 +0000 (11:12 -0700)]
selinux: inline avc_audit() and avc_has_perm_noaudit() into caller
Now that all the slow-path code is gone from these functions, we can
inline them into the main caller - avc_has_perm_flags().
Now the compiler can see that 'avc' is allocated on the stack for this
case, which helps register pressure a bit. It also actually shrinks the
total stack frame, because the stack frame that avc_has_perm_flags()
always needed (for that 'avc' allocation) is now sufficient for the
inlined functions too.
Inlining isn't bad - but mindless inlining of cold code (see the
previous commit) is.
Linus Torvalds [Sat, 31 Mar 2012 17:58:08 +0000 (10:58 -0700)]
selinux: don't inline slow-path code into avc_has_perm_noaudit()
The selinux AVC paths remain some of the hottest (and deepest) codepaths
at filename lookup time, and we make it worse by having the slow path
cases take up I$ and stack space even when they don't trigger. Gcc
tends to always want to inline functions that are just called once -
never mind that this might make for slower and worse code in the caller.
So this tries to improve on it a bit by making the slow-path cases
explicitly separate functions that are marked noinline, causing gcc to
at least no longer allocate stack space for them unless they are
actually called. It also seems to help register allocation a tiny bit,
since gcc now doesn't take the slow case code into account.
Uninlining the slow path may also allow us to inline the remaining hot
path into the one caller that actually matters: avc_has_perm_flags().
I'll have to look at that separately, but both avc_audit() and
avc_has_perm_noaudit() are now small and lean enough that inlining them
may make sense.
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