Trevor found a file size problem in eCryptfs in recent kernels, and he
tracked it down to an fsstack change.
This was the eCryptfs copy_attr_all:
> -void ecryptfs_copy_attr_all(struct inode *dest, const struct inode *src)
> -{
> - dest->i_mode = src->i_mode;
> - dest->i_nlink = src->i_nlink;
> - dest->i_uid = src->i_uid;
> - dest->i_gid = src->i_gid;
> - dest->i_rdev = src->i_rdev;
> - dest->i_atime = src->i_atime;
> - dest->i_mtime = src->i_mtime;
> - dest->i_ctime = src->i_ctime;
> - dest->i_blkbits = src->i_blkbits;
> - dest->i_flags = src->i_flags;
> -}
This is the fsstack copy_attr_all:
> +void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
> + int (*get_nlinks)(struct inode *))
> +{
> + if (!get_nlinks)
> + dest->i_nlink = src->i_nlink;
> + else
> + dest->i_nlink = (*get_nlinks)(dest);
> +
> + dest->i_mode = src->i_mode;
> + dest->i_uid = src->i_uid;
> + dest->i_gid = src->i_gid;
> + dest->i_rdev = src->i_rdev;
> + dest->i_atime = src->i_atime;
> + dest->i_mtime = src->i_mtime;
> + dest->i_ctime = src->i_ctime;
> + dest->i_blkbits = src->i_blkbits;
> + dest->i_flags = src->i_flags;
> +
> + fsstack_copy_inode_size(dest, src);
> +}
The addition of copy_inode_size breaks eCryptfs, since eCryptfs needs to
interpolate the file sizes (eCryptfs has extra space in the lower file for
the header). The setting of the upper inode size occurs elsewhere in
eCryptfs, and the new copy_attr_all now undoes what eCryptfs was doing
right beforehand.
I see three ways of going forward from here. (1) Something like this patch
needs to go in (assuming it jives with Unionfs), (2) we need to make a
change to the fsstack API for more fine-grained control over copying
attributes (e.g., by also including a callback function for calculating the
right file size, which will require some more work on both eCryptfs and
Unionfs), or (3) the fsstack patch on eCryptfs (commit
0cc72dc7f0 made on Fri Dec 8 02:36:31 2006
-0800) needs to be yanked in 2.6.20.
I think the simplest solution, from eCryptfs' perspective, is to just
remove the inode size copy.
Remove inode size copy in general fsstack attr copy code. Stacked
filesystems may need to interpolate the inode size, since the file
size in the lower file may be different than the file size in the
stacked layer.
Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Acked-by: Josef "Jeff" Sipek <jsipek@cs.sunysb.edu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
The sanity check for no_irq_chip in __set_irq_hander() is unconditional on
both install and uninstall of an handler. This triggers false warnings and
replaces no_irq_chip by dummy_irq_chip in the uninstall case.
Check only, when a real handler is installed.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Sylvain Munaut <tnt@246tNt.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
fix vm_events_fold_cpu() build breakage
2.6.20-rc1 does not build properly if CONFIG_VM_EVENT_COUNTERS is set
and CONFIG_HOTPLUG is unset:
CC init/version.o
LD init/built-in.o
LD .tmp_vmlinux1
mm/built-in.o: In function `page_alloc_cpu_notify':
page_alloc.c:(.text+0x56eb): undefined reference to `vm_events_fold_cpu'
make: *** [.tmp_vmlinux1] Error 1
[akpm@osdl.org: cleanup]
Signed-off-by: Magnus Damm <magnus@valinux.co.jp>
Cc: Christoph Lameter <clameter@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
The structure cpu_isolated_map is used not only during initialization.
Multi-core scheduler configuration changes and exclusive cpusets
use this during run time. During setting of sched_mc_power_savings
policy, this structure is accessed to update sched_domains.
Signed-off-by: Tim Chen <tim.c.chen@intel.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
The version of mm/vmscan.c in Linus' current tree has swapped parameters in
the shrink_all_zones declaration and call, used by the various
suspend-to-disk implementations. This doesn't seem to have any great
adverse effect, but it's clearly wrong.
Signed-off-by: Nigel Cunningham <nigel@suspend2.net>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Add proper prototypes for sysv_{init,destroy}_icache() in sysv.h
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
The declaration of kmem_ptr_validate in slab.h does not match the
one in slab.c. Remove the fastcall attribute (this is the only use in
slab.c).
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
drivers/char/rtc.c:116: warning: 'hpet_rtc_interrupt' defined but not used
Cc: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Ran into BUG() while doing madvise(REMOVE) testing. If we are punching a
hole into shared memory segment using madvise(REMOVE) and the entire hole
is below the indirect blocks, we hit following assert.
BUG_ON(limit <= SHMEM_NR_DIRECT);
Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Commit 2d7d253548 ("fix cond_resched() fix")
introduced an 'expected_preempt_count' parameter to __resched_legal() to
fix a bug where it was returning a false negative when called from
cond_resched_lock() and preemption was enabled.
Unfortunately this broke things for when preemption is disabled.
preempt_count() will always return zero, thus failing the check against any
value of expected_preempt_count not equal to zero. cond_resched_lock() for
example, passes an expected_preempt_count value of 1.
So fix the fix for the cond_resched() fix by skipping the check of
preempt_count() against expected_preempt_count when preemption is disabled.
Credit should go to Sunil Mushran for spotting the bug during testing.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
The VM event counters, enabled by CONFIG_VM_EVENT_COUNTERS, which provides
VM event counters in /proc/vmstat, has become more essential to
non-EMBEDDED kernel configurations than they were in the past. Comments in
the code and the Kconfig configuration explanation were stale, downplaying
their role excessively.
Refresh those comments to correctly reflect the current role of VM event
counters.
Signed-off-by: Paul Jackson <pj@sgi.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Add compile-time and run-time API versioning.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Some msrs, such as MSR_STAR, are not available on all processors. Exporting
them causes qemu to try to fetch them, which will fail.
So, check all msrs for validity at module load time.
Signed-off-by: Michael Riepe <michael@mr511.de>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Consolidate the logic for checking whether a vcpu index is valid. Also, use
likely(), as a valid value should be the overwhelmingly common case.
Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Only (un)account for IO and page-dirtying for devices which have real backing
store (ie: not tmpfs or ramdisks).
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Michael Halcrow
Andrew Morton
Vitaly Wool
Thomas Gleixner
Magnus Damm
Tim Chen
Tobias Klauser
Nigel Cunningham
Adrian Bunk
Randy Dunlap
Christoph Lameter
Badari Pulavarty
Mark Fasheh
Paul Jackson
Avi Kivity
Michael Riepe
James Morris