- 18 Apr, 2022 40 commits
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Christoph Hellwig authored
lo_refcount counts how many openers a loop device has, but that count is already provided by the block layer in the bd_openers field of the whole-disk block_device. Remove lo_refcount and allow opens to succeed even on devices beeing deleted - now that ->free_disk is implemented we can handle that race gracefull and all I/O on it will just fail. Similarly there is a small race window now where loop_control_remove does not synchronize the delete vs the remove due do bd_openers not being under lo_mutex protection, but we can handle that just as gracefully. Signed-off-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20220330052917.2566582-15-hch@lst.deSigned-off-by:
Jens Axboe <axboe@kernel.dk>
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Tetsuo Handa authored
Since ->release is called with disk->open_mutex held, and __loop_clr_fd() from lo_release() is called via ->release when disk_openers() == 0, we are guaranteed that "struct file" which will be passed to loop_validate_file() via fget() cannot be the loop device __loop_clr_fd(lo, true) will clear. Thus, there is no need to hold loop_validate_mutex from __loop_clr_fd() if release == true. When I made commit 3ce6e1f6 ("loop: reintroduce global lock for safe loop_validate_file() traversal"), I wrote "It is acceptable for loop_validate_file() to succeed, for actual clear operation has not started yet.". But now I came to feel why it is acceptable to succeed. It seems that the loop driver was added in Linux 1.3.68, and if (lo->lo_refcnt > 1) return -EBUSY; check in loop_clr_fd() was there from the beginning. The intent of this check was unclear. But now I think that current disk_openers(lo->lo_disk) > 1 form is there for three reasons. (1) Avoid I/O errors when some process which opens and reads from this loop device in response to uevent notification (e.g. systemd-udevd), as described in commit a1ecac3b ("loop: Make explicit loop device destruction lazy"). This opener is short-lived because it is likely that the file descriptor used by that process is closed soon. (2) Avoid I/O errors caused by underlying layer of stacked loop devices (i.e. ioctl(some_loop_fd, LOOP_SET_FD, other_loop_fd)) being suddenly disappeared. This opener is long-lived because this reference is associated with not a file descriptor but lo->lo_backing_file. (3) Avoid I/O errors caused by underlying layer of mounted loop device (i.e. mount(some_loop_device, some_mount_point)) being suddenly disappeared. This opener is long-lived because this reference is associated with not a file descriptor but mount. While race in (1) might be acceptable, (2) and (3) should be checked racelessly. That is, make sure that __loop_clr_fd() will not run if loop_validate_file() succeeds, by doing refcount check with global lock held when explicit loop device destruction is requested. As a result of no longer waiting for lo->lo_mutex after setting Lo_rundown, we can remove pointless BUG_ON(lo->lo_state != Lo_rundown) check. Signed-off-by:
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by:
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Christoph Hellwig authored
Currently, udev change event is generated for a loop device before the device is ready for IO. Due to serialization on lo->lo_mutex in lo_open() this does not matter because anybody is able to open the device and do IO only after the configuration is finished. However this synchronization in lo_open() is going away so make sure userspace reacting to the change event will see the new device state by generating the event only when the device is setup. Signed-off-by:
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Christoph Hellwig authored
Ensure that the lo_device which is stored in the gendisk private data is valid until the gendisk is freed. Currently the loop driver uses a lot of effort to make sure a device is not freed when it is still in use, but to to fix a potential deadlock this will be relaxed a bit soon. Signed-off-by:
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Christoph Hellwig authored
->release is only called after all outstanding I/O has completed, so only freeze the queue when clearing the backing file of a live loop device. Signed-off-by:
Darrick J. Wong <djwong@kernel.org> Link: https://lore.kernel.org/r/20220330052917.2566582-11-hch@lst.deSigned-off-by:
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Christoph Hellwig authored
By the time the final ->release is called there can't be outstanding I/O. For non-final ->release there is no need for driver action at all. Thus remove the useless queue freeze. Signed-off-by:
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Christoph Hellwig authored
Nothing prevents a file system or userspace opener of the block device from redirtying the page right afte sync_blockdev returned. Fortunately data in the page cache during a block device change is mostly harmless anyway. Signed-off-by:
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Christoph Hellwig authored
There is no need to reinitialize idle_worker_list, worker_tree and timer every time a loop device is configured. Just initialize them once at allocation time. Signed-off-by:
Chaitanya Kulkarni <kch@nvidia.com> Tested-by:
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Christoph Hellwig authored
Use a common helper for both timer based and uncoditional freeing of idle workers. Signed-off-by:
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Christoph Hellwig authored
All manipulation of bd_openers is under disk->open_mutex and will remain so for the foreseeable future. But at least one place reads it without the lock (blkdev_get) and there are more to be added. So make sure the compiler does not do turn the increments and decrements into non-atomic sequences by using an atomic_t. Signed-off-by:
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Christoph Hellwig authored
Add a helper that returns the openers for a given gendisk to avoid having drivers poke into disk->part0 to get at this information in a somewhat cumbersome way. Signed-off-by:
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Christoph Hellwig authored
Remove the bdev variable and just use the gendisk pointed to by the zram_device directly. Signed-off-by:
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Christoph Hellwig authored
Use a local variable for the gendisk instead of the part0 block_device, as the gendisk is what this function actually operates on. Signed-off-by:
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Christoph Hellwig authored
The bdev parameter to ->ioctl contains the block device that the ioctl is called on, which can be the partition. But the openers check in nbd_bdev_reset really needs to check use the whole device, so switch to using that. Signed-off-by:
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Haowen Bai authored
Return boolean values ("true" or "false") instead of 1 or 0 from bool functions. This fixes the following warnings from coccicheck: ./drivers/block/drbd/drbd_req.c:912:9-10: WARNING: return of 0/1 in function 'remote_due_to_read_balancing' with return type bool Signed-off-by:Haowen Bai <baihaowen@meizu.com> Reviewed-by:
Christoph Böhmwalder <christoph.boehmwalder@linbit.com> Link: https://lore.kernel.org/r/20220406190715.1938174-8-christoph.boehmwalder@linbit.comSigned-off-by:
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Uladzislau Rezki (Sony) authored
Instead of invoking a synchronize_rcu() to free a pointer after a grace period we can directly make use of new API that does the same but in more efficient way. TO: Jens Axboe <axboe@kernel.dk> TO: Philipp Reisner <philipp.reisner@linbit.com> TO: Jason Gunthorpe <jgg@nvidia.com> TO: drbd-dev@lists.linbit.com TO: linux-block@vger.kernel.org Signed-off-by:
Uladzislau Rezki (Sony) <urezki@gmail.com> Reviewed-by:
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Cai Huoqing authored
when run checkpath.pl for the first patch, found that WARNING: Prefer 'unsigned int' to bare use of 'unsigned'. so fix it. BTW Signed-off-by:
Cai Huoqing <caihuoqing@baidu.com> Acked-by:
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Cai Huoqing authored
it's a refactor to make use of PFN_UP helper macro Signed-off-by:
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Jiapeng Chong authored
Variable err is set to '-EIO' but this value is never read as it is overwritten or not used later on, hence it is a redundant assignment and can be removed. Clean up the following clang-analyzer warning: drivers/block/drbd/drbd_receiver.c:3955:5: warning: Value stored to 'err' is never read [clang-analyzer-deadcode.DeadStores]. Reported-by:
Abaci Robot <abaci@linux.alibaba.com> Signed-off-by:
Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Acked-by:
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Arnd Bergmann authored
gcc -Wextra warns about mixing drbd_state_rv with drbd_ret_code in a couple of places: drivers/block/drbd/drbd_nl.c: In function 'drbd_adm_set_role': drivers/block/drbd/drbd_nl.c:777:14: warning: comparison between 'enum drbd_state_rv' and 'enum drbd_ret_code' [-Wenum-compare] 777 | if (retcode != NO_ERROR) | ^~ drivers/block/drbd/drbd_nl.c:784:12: warning: implicit conversion from 'enum drbd_ret_code' to 'enum drbd_state_rv' [-Wenum-conversion] 784 | retcode = ERR_MANDATORY_TAG; | ^ drivers/block/drbd/drbd_nl.c: In function 'drbd_adm_attach': drivers/block/drbd/drbd_nl.c:1965:10: warning: implicit conversion from 'enum drbd_state_rv' to 'enum drbd_ret_code' [-Wenum-conversion] 1965 | retcode = rv; /* FIXME: Type mismatch. */ | ^ drivers/block/drbd/drbd_nl.c: In function 'drbd_adm_connect': drivers/block/drbd/drbd_nl.c:2690:10: warning: implicit conversion from 'enum drbd_state_rv' to 'enum drbd_ret_code' [-Wenum-conversion] 2690 | retcode = conn_request_state(connection, NS(conn, C_UNCONNECTED), CS_VERBOSE); | ^ drivers/block/drbd/drbd_nl.c: In function 'drbd_adm_disconnect': drivers/block/drbd/drbd_nl.c:2803:11: warning: implicit conversion from 'enum drbd_state_rv' to 'enum drbd_ret_code' [-Wenum-conversion] 2803 | retcode = rv; /* FIXME: Type mismatch. */ | ^ In each case, both are passed into drbd_adm_finish(), which just takes a 32-bit integer and is happy with either, presumably intentionally. Restructure the code to pass either type directly in there in most cases, avoiding the warnings. Signed-off-by:Arnd Bergmann <arnd@arndb.de> Reviewed-by:
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Arnd Bergmann authored
There are two initializers for P_RETRY_WRITE: drivers/block/drbd/drbd_main.c:3676:22: warning: initialized field overwritten [-Woverride-init] Remove the first one since it was already ignored by the compiler and reorder the list to match the enum definition. As P_ZEROES had no entry, add that one instead. Fixes: 036b17ea ("drbd: Receiving part for the PROTOCOL_UPDATE packet") Fixes: f31e583a ("drbd: introduce P_ZEROES (REQ_OP_WRITE_ZEROES on the "wire")") Signed-off-by:
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Christoph Hellwig authored
Randomly poking into block device internals for manual prefetches isn't exactly a very maintainable thing to do. And none of the performance critical direct I/O implementations still use this library function anyway, so just drop it. Signed-off-by:
Damien Le Moal <damien.lemoal@opensource.wdc.com> Link: https://lore.kernel.org/r/20220415045258.199825-28-hch@lst.deSigned-off-by:
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Christoph Hellwig authored
Secure erase is a very different operation from discard in that it is a data integrity operation vs hint. Fully split the limits and helper infrastructure to make the separation more clear. Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com> Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> [drbd] Acked-by: Ryusuke Konishi <konishi.ryusuke@gmail.com> [nifs2] Acked-by: Jaegeuk Kim <jaegeuk@kernel.org> [f2fs] Acked-by: Coly Li <colyli@suse.de> [bcache] Acked-by: David Sterba <dsterba@suse.com> [btrfs] Acked-by:
Chao Yu <chao@kernel.org> Reviewed-by:
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Christoph Hellwig authored
Abstract away implementation details from file systems by providing a block_device based helper to retrieve the discard granularity. Signed-off-by:
Ryusuke Konishi <konishi.ryusuke@gmail.com> Acked-by: David Sterba <dsterba@suse.com> [btrfs] Link: https://lore.kernel.org/r/20220415045258.199825-26-hch@lst.deSigned-off-by:
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Christoph Hellwig authored
Just use a non-zero max_discard_sectors as an indicator for discard support, similar to what is done for write zeroes. The only places where needs special attention is the RAID5 driver, which must clear discard support for security reasons by default, even if the default stacking rules would allow for it. Signed-off-by:
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Christoph Hellwig authored
Add a helper to query the number of sectors support per each discard bio based on the block device and use this helper to stop various places from poking into the request_queue to see if discard is supported and if so how much. This mirrors what is done e.g. for write zeroes as well. Signed-off-by:
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Christoph Hellwig authored
Move all the logic to limit the discard bio size into a common helper so that it is better documented. Signed-off-by:
Coly Li <colyli@suse.de> Reviewed-by:
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Christoph Hellwig authored
No need to inline these fairly larger helpers. Also fix the return value to be unsigned, just like the field in struct queue_limits. Signed-off-by:
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Christoph Hellwig authored
Use the bdev based alignment helper instead of open coding it. Signed-off-by:
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Christoph Hellwig authored
Just use bdev_alignment_offset in disk_discard_alignment_show instead. That helpers is the same except for an always false branch that doesn't matter in this slow path. Signed-off-by:
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Christoph Hellwig authored
No need to inline these fairly larger helpers. Signed-off-by:
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Christoph Hellwig authored
This does the same as the open coded variant except for an extra branch, and allows to remove queue_alignment_offset entirely. Signed-off-by:
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Christoph Hellwig authored
Replace the open coded offset calculation with the proper helper. This is an ABI change in that the -1 for a misaligned partition is properly propagated, which can be considered a bug fix and matches what is done on the whole device. Signed-off-by:
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Christoph Hellwig authored
Add a helper to check the max supported sectors for zone append based on the block_device instead of having to poke into the block layer internal request_queue. Signed-off-by:
Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by:
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Christoph Hellwig authored
Add a helper to check the stable writes flag based on the block_device instead of having to poke into the block layer internal request_queue. Signed-off-by:
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Christoph Hellwig authored
Add a helper to check the FUA flag based on the block_device instead of having to poke into the block layer internal request_queue. Signed-off-by:
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Christoph Hellwig authored
Add a helper to check the write cache flag based on the block_device instead of having to poke into the block layer internal request_queue. Signed-off-by:
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Christoph Hellwig authored
Add a helper to check the nonrot flag based on the block_device instead of having to poke into the block layer internal request_queue. Signed-off-by:
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Christoph Hellwig authored
Use the bdev based helper instead of poking into the queue. Signed-off-by:
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Christoph Hellwig authored
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