08 Apr, 2013
1 commit
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This reverts commit 8761a3dc1f07b163414e2215a2cadbb4cfe2a107.
There are situations where the destruction path is called
with the bdev->bd_mutex already held, which then deadlocks in
loop_clr_fd(). The normal partition cleanup does a trylock()
on the mutex, but it'd be nice to have a more bullet proof
method in loop. So punt this more involved fix to the next
merge window, and just back out this buggy fix for now.Signed-off-by: Jens Axboe
23 Mar, 2013
1 commit
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Any partitions added by user space to the loop device were being
left in place after detaching the loop device. This was because
the detach path issued a BLKRRPART to clean up partitions if
LO_FLAGS_PARTSCAN was set, meaning that the partitions were auto
scanned on attach. Replace this BLKRRPART with code that
unconditionally cleans up partitions on detach instead.Signed-off-by: Phillip Susi
Modified by Jens to export delete_partition().
Signed-off-by: Jens Axboe
28 Feb, 2013
2 commits
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Currently, sizeof(struct parsed_partitions) may be 64KB in 32bit arch, so
it is easy to trigger page allocation failure by check_partition,
especially in hotplug block device situation(such as, USB mass storage,
MMC card, ...), and Felipe Balbi has observed the failure.This patch does below optimizations on the allocation of struct
parsed_partitions to try to address the issue:- make parsed_partitions.parts as pointer so that the pointed memory can
fit in 32KB buffer, then approximate 32KB memory can be saved- vmalloc the buffer pointed by parsed_partitions.parts because 32KB is
still a bit big for kmalloc- given that many devices have the partition count limit, so only
allocate disk_max_parts() partitions instead of 256 partitions alwaysSigned-off-by: Ming Lei
Reported-by: Felipe Balbi
Cc: Jens Axboe
Reviewed-by: Yasuaki Ishimatsu
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
While adding and removing a lot of disks disks and partitions this
sometimes shows up:WARNING: at fs/sysfs/dir.c:512 sysfs_add_one+0xc9/0x130() (Not tainted)
Hardware name:
sysfs: cannot create duplicate filename '/dev/block/259:751'
Modules linked in: raid1 autofs4 bnx2fc cnic uio fcoe libfcoe libfc 8021q scsi_transport_fc scsi_tgt garp stp llc sunrpc cpufreq_ondemand powernow_k8 freq_table mperf ipv6 dm_mirror dm_region_hash dm_log power_meter microcode dcdbas serio_raw amd64_edac_mod edac_core edac_mce_amd i2c_piix4 i2c_core k10temp bnx2 sg ixgbe dca mdio ext4 mbcache jbd2 dm_round_robin sr_mod cdrom sd_mod crc_t10dif ata_generic pata_acpi pata_atiixp ahci mptsas mptscsih mptbase scsi_transport_sas dm_multipath dm_mod [last unloaded: scsi_wait_scan]
Pid: 44103, comm: async/16 Not tainted 2.6.32-195.el6.x86_64 #1
Call Trace:
warn_slowpath_common+0x87/0xc0
warn_slowpath_fmt+0x46/0x50
sysfs_add_one+0xc9/0x130
sysfs_do_create_link+0x12b/0x170
sysfs_create_link+0x13/0x20
device_add+0x317/0x650
idr_get_new+0x13/0x50
add_partition+0x21c/0x390
rescan_partitions+0x32b/0x470
sd_open+0x81/0x1f0 [sd_mod]
__blkdev_get+0x1b6/0x3c0
blkdev_get+0x10/0x20
register_disk+0x155/0x170
add_disk+0xa6/0x160
sd_probe_async+0x13b/0x210 [sd_mod]
add_wait_queue+0x46/0x60
async_thread+0x102/0x250
default_wake_function+0x0/0x20
async_thread+0x0/0x250
kthread+0x96/0xa0
child_rip+0xa/0x20
kthread+0x0/0xa0
child_rip+0x0/0x20This most likely happens because dev_t is freed while the number is
still used and idr_get_new() is not protected on every use. The fix
adds a mutex where it wasn't before and moves the dev_t free function so
it is called after device del.Signed-off-by: Tomas Henzl
Cc: Jens Axboe
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
01 Aug, 2012
1 commit
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Add a new operation code (BLKPG_RESIZE_PARTITION) to the BLKPG ioctl that
allows altering the size of an existing partition, even if it is currently
in use.This patch converts hd_struct->nr_sects into sequence counter because
One might extend a partition while IO is happening to it and update of
nr_sects can be non-atomic on 32bit machines with 64bit sector_t. This
can lead to issues like reading inconsistent size of a partition. Sequence
counter have been used so that readers don't have to take bdev mutex lock
as we call sector_in_part() very frequently.Now all the access to hd_struct->nr_sects should happen using sequence
counter read/update helper functions part_nr_sects_read/part_nr_sects_write.
There is one exception though, set_capacity()/get_capacity(). I think
theoritically race should exist there too but this patch does not
modify set_capacity()/get_capacity() due to sheer number of call sites
and I am afraid that change might break something. I have left that as a
TODO item. We can handle it later if need be. This patch does not introduce
any new races as such w.r.t set_capacity()/get_capacity().v2: Add CONFIG_LBDAF test to UP preempt case as suggested by Phillip.
Signed-off-by: Vivek Goyal
Signed-off-by: Phillip Susi
Signed-off-by: Jens Axboe
02 Mar, 2012
1 commit
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Since 2.6.39 (1196f8b), when a driver returns -ENOMEDIUM for open(),
__blkdev_get() calls rescan_partitions() to remove
in-kernel partition structures and raise KOBJ_CHANGE uevent.However it ends up calling driver's revalidate_disk without open
and could cause oops.In the case of SCSI:
process A process B
----------------------------------------------
sys_open
__blkdev_get
sd_open
returns -ENOMEDIUM
scsi_remove_device
rescan_partitions
sd_revalidate_disk
Oopses are reported here:
http://marc.info/?l=linux-scsi&m=132388619710052This patch separates the partition invalidation from rescan_partitions()
and use it for -ENOMEDIUM case.Reported-by: Huajun Li
Signed-off-by: Jun'ichi Nomura
Acked-by: Tejun Heo
Cc: stable@kernel.org
Signed-off-by: Jens Axboe
04 Jan, 2012
1 commit
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Signed-off-by: Al Viro
