- 21 Jun, 2017 6 commits
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David Sterba authored
Similar to what submit_bio_wait does, we should account for IO while waiting for a bio completion. This has marginal visible effects, flush bio is short-lived. Reviewed-by:
Anand Jain <anand.jain@oracle.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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David Sterba authored
For devices that support flushing, we allocate a bio, submit, wait for it and then free it. The bio allocation does not fail so ENOMEM is not a problem but we still may unnecessarily stress the allocation subsystem. Instead, we can allocate the bio at the same time we allocate the device and reuse it each time we need to flush the barriers. The bio is reset before each use. Reference counting is simplified to just device allocation (get) and freeing (put). The bio used to be submitted through the integrity checker which will find out that bio has no data attached and call submit_bio. Status of the bio in flight needs to be tracked separately in case the device caches get switched off between write and wait. Signed-off-by: -
Filipe Manana authored
An incremental send can contain unlink operations with an invalid target path when we rename some directory inode A, then rename some file inode B to the old name of inode A and directory inode A is an ancestor of inode B in the parent snapshot (but not anymore in the send snapshot). Consider the following example scenario where this issue happens. Parent snapshot: . (ino 256) | |--- dir1/ (ino 257) |--- dir2/ (ino 258) | |--- file1 (ino 259) | |--- file3 (ino 261) | |--- dir3/ (ino 262) |--- file22 (ino 260) |--- dir4/ (ino 263) Send snapshot: . (ino 256) | |--- dir1/ (ino 257) |--- dir2/ (ino 258) |--- dir3 (ino 260) |--- file3/ (ino 262) |--- dir4/ (ino 263) |--- file11 (ino 269) |--- file33 (ino 261) When attempting to apply the corresponding incremental send stream, an unlink operation contains an invalid path which makes the receiver fail. The following is verbose output of the btrfs receive command: receiving snapshot snap2 uuid=7d5450da-a573-e043-a451-ec85f4879f0f (...) utimes utimes dir1 utimes dir1/dir2 link dir1/dir3/dir4/file11 -> dir1/dir2/file1 unlink dir1/dir2/file1 utimes dir1/dir2 truncate dir1/dir3/dir4/file11 size=0 utimes dir1/dir3/dir4/file11 rename dir1/dir3 -> o262-7-0 link dir1/dir3 -> o262-7-0/file22 unlink dir1/dir3/file22 ERROR: unlink dir1/dir3/file22 failed. Not a directory The following steps happen during the computation of the incremental send stream the lead to this issue: 1) Before we start processing the new and deleted references for inode 260, we compute the full path of the deleted reference ("dir1/dir3/file22") and cache it in the list of deleted references for our inode. 2) We then start processing the new references for inode 260, for which there is only one new, located at "dir1/dir3". When processing this new reference, we check that inode 262, which was not yet processed, collides with the new reference and because of that we orphanize inode 262 so its new full path becomes "o262-7-0". 3) After the orphanization of inode 262, we create the new reference for inode 260 by issuing a link command with a target path of "dir1/dir3" and a source path of "o262-7-0/file22". 4) We then start processing the deleted references for inode 260, for which there is only one with the base name of "file22", and issue an unlink operation containing the target path computed at step 1, which is wrong because that path no longer exists and should be replaced with "o262-7-0/file22". So fix this issue by recomputing the full path of deleted references if when we processed the new references for an inode we ended up orphanizing any other inode that is an ancestor of our inode in the parent snapshot. A test case for fstests follows soon. Signed-off-by:Filipe Manana <fdmanana@suse.com> [ adjusted after prev patch removed fs_path::dir_path and dir_path_len ] Signed-off-by:
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Filipe Manana authored
Currently an incremental snapshot can generate link operations which contain an invalid target path. Such case happens when in the send snapshot a file was renamed, a new hard link added for it and some other inode (with a lower number) got renamed to the former name of that file. Example: Parent snapshot . (ino 256) | |--- f1 (ino 257) |--- f2 (ino 258) |--- f3 (ino 259) Send snapshot . (ino 256) | |--- f2 (ino 257) |--- f3 (ino 258) |--- f4 (ino 259) |--- f5 (ino 258) The following steps happen when computing the incremental send stream: 1) When processing inode 257, inode 258 is orphanized (renamed to "o258-7-0"), because its current reference has the same name as the new reference for inode 257; 2) When processing inode 258, we iterate over all its new references, which have the names "f3" and "f5". The first iteration sees name "f5" and renames the inode from its orphan name ("o258-7-0") to "f5", while the second iteration sees the name "f3" and, incorrectly, issues a link operation with a target name matching the orphan name, which no longer exists. The first iteration had reset the current valid path of the inode to "f5", but in the second iteration we lost it because we found another inode, with a higher number of 259, which has a reference named "f3" as well, so we orphanized inode 259 and recomputed the current valid path of inode 258 to its old orphan name because inode 259 could be an ancestor of inode 258 and therefore the current valid path could contain the pre-orphanization name of inode 259. However in this case inode 259 is not an ancestor of inode 258 so the current valid path should not be recomputed. This makes the receiver fail with the following error: ERROR: link f3 -> o258-7-0 failed: No such file or directory So fix this by not recomputing the current valid path for an inode whenever we find a colliding reference from some not yet processed inode (inode number higher then the one currently being processed), unless that other inode is an ancestor of the one we are currently processing. A test case for fstests will follow soon. Signed-off-by: -
Filipe Manana authored
While punching a hole in a range that is not aligned with the sector size (currently the same as the page size) we can end up leaving an extent map in memory with a length that is smaller then the sector size or with a start offset that is not aligned to the sector size. Both cases are not expected and can lead to problems. This issue is easily detected after the patch from commit a7e3b975 ("Btrfs: fix reported number of inode blocks"), introduced in kernel 4.12-rc1, in a scenario like the following for example: $ mkfs.btrfs -f /dev/sdb $ mount /dev/sdb /mnt $ xfs_io -c "pwrite -S 0xaa -b 100K 0 100K" /mnt/foo $ xfs_io -c "fpunch 60K 90K" /mnt/foo $ xfs_io -c "pwrite -S 0xbb -b 100K 50K 100K" /mnt/foo $ xfs_io -c "pwrite -S 0xcc -b 50K 100K 50K" /mnt/foo $ umount /mnt After the unmount operation we can see several warnings emmitted due to underflows related to space reservation counters: [ 2837.443299] ------------[ cut here ]------------ [ 2837.447395] WARNING: CPU: 8 PID: 2474 at fs/btrfs/inode.c:9444 btrfs_destroy_inode+0xe8/0x27e [btrfs] [ 2837.452108] Modules linked in: dm_flakey dm_mod ppdev parport_pc psmouse parport sg pcspkr acpi_cpufreq tpm_tis tpm_tis_core i2c_piix4 i2c_core evdev tpm button se rio_raw sunrpc loop autofs4 ext4 crc16 jbd2 mbcache btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_gene ric raid1 raid0 multipath linear md_mod sr_mod cdrom sd_mod ata_generic virtio_scsi ata_piix libata virtio_pci virtio_ring virtio e1000 scsi_mod floppy [ 2837.458389] CPU: 8 PID: 2474 Comm: umount Tainted: G W 4.10.0-rc8-btrfs-next-43+ #1 [ 2837.459754] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014 [ 2837.462379] Call Trace: [ 2837.462379] dump_stack+0x68/0x92 [ 2837.462379] __warn+0xc2/0xdd [ 2837.462379] warn_slowpath_null+0x1d/0x1f [ 2837.462379] btrfs_destroy_inode+0xe8/0x27e [btrfs] [ 2837.462379] destroy_inode+0x3d/0x55 [ 2837.462379] evict+0x177/0x17e [ 2837.462379] dispose_list+0x50/0x71 [ 2837.462379] evict_inodes+0x132/0x141 [ 2837.462379] generic_shutdown_super+0x3f/0xeb [ 2837.462379] kill_anon_super+0x12/0x1c [ 2837.462379] btrfs_kill_super+0x16/0x21 [btrfs] [ 2837.462379] deactivate_locked_super+0x30/0x68 [ 2837.462379] deactivate_super+0x36/0x39 [ 2837.462379] cleanup_mnt+0x58/0x76 [ 2837.462379] __cleanup_mnt+0x12/0x14 [ 2837.462379] task_work_run+0x77/0x9b [ 2837.462379] prepare_exit_to_usermode+0x9d/0xc5 [ 2837.462379] syscall_return_slowpath+0x196/0x1b9 [ 2837.462379] entry_SYSCALL_64_fastpath+0xab/0xad [ 2837.462379] RIP: 0033:0x7f3ef3e6b9a7 [ 2837.462379] RSP: 002b:00007ffdd0d8de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 [ 2837.462379] RAX: 0000000000000000 RBX: 0000556f76a39060 RCX: 00007f3ef3e6b9a7 [ 2837.462379] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000556f76a3f910 [ 2837.462379] RBP: 0000556f76a3f910 R08: 0000556f76a3e670 R09: 0000000000000015 [ 2837.462379] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007f3ef436ce64 [ 2837.462379] R13: 0000000000000000 R14: 0000556f76a39240 R15: 00007ffdd0d8e0e0 [ 2837.519355] ---[ end trace e79345fe24b30b8d ]--- [ 2837.596256] ------------[ cut here ]------------ [ 2837.597625] WARNING: CPU: 8 PID: 2474 at fs/btrfs/extent-tree.c:5699 btrfs_free_block_groups+0x246/0x3eb [btrfs] [ 2837.603547] Modules linked in: dm_flakey dm_mod ppdev parport_pc psmouse parport sg pcspkr acpi_cpufreq tpm_tis tpm_tis_core i2c_piix4 i2c_core evdev tpm button serio_raw sunrpc loop autofs4 ext4 crc16 jbd2 mbcache btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sr_mod cdrom sd_mod ata_generic virtio_scsi ata_piix libata virtio_pci virtio_ring virtio e1000 scsi_mod floppy [ 2837.659372] CPU: 8 PID: 2474 Comm: umount Tainted: G W 4.10.0-rc8-btrfs-next-43+ #1 [ 2837.663359] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014 [ 2837.663359] Call Trace: [ 2837.663359] dump_stack+0x68/0x92 [ 2837.663359] __warn+0xc2/0xdd [ 2837.663359] warn_slowpath_null+0x1d/0x1f [ 2837.663359] btrfs_free_block_groups+0x246/0x3eb [btrfs] [ 2837.663359] close_ctree+0x1dd/0x2e1 [btrfs] [ 2837.663359] ? evict_inodes+0x132/0x141 [ 2837.663359] btrfs_put_super+0x15/0x17 [btrfs] [ 2837.663359] generic_shutdown_super+0x6a/0xeb [ 2837.663359] kill_anon_super+0x12/0x1c [ 2837.663359] btrfs_kill_super+0x16/0x21 [btrfs] [ 2837.663359] deactivate_locked_super+0x30/0x68 [ 2837.663359] deactivate_super+0x36/0x39 [ 2837.663359] cleanup_mnt+0x58/0x76 [ 2837.663359] __cleanup_mnt+0x12/0x14 [ 2837.663359] task_work_run+0x77/0x9b [ 2837.663359] prepare_exit_to_usermode+0x9d/0xc5 [ 2837.663359] syscall_return_slowpath+0x196/0x1b9 [ 2837.663359] entry_SYSCALL_64_fastpath+0xab/0xad [ 2837.663359] RIP: 0033:0x7f3ef3e6b9a7 [ 2837.663359] RSP: 002b:00007ffdd0d8de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 [ 2837.663359] RAX: 0000000000000000 RBX: 0000556f76a39060 RCX: 00007f3ef3e6b9a7 [ 2837.663359] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000556f76a3f910 [ 2837.663359] RBP: 0000556f76a3f910 R08: 0000556f76a3e670 R09: 0000000000000015 [ 2837.663359] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007f3ef436ce64 [ 2837.663359] R13: 0000000000000000 R14: 0000556f76a39240 R15: 00007ffdd0d8e0e0 [ 2837.739445] ---[ end trace e79345fe24b30b8e ]--- [ 2837.745595] ------------[ cut here ]------------ [ 2837.746412] WARNING: CPU: 8 PID: 2474 at fs/btrfs/extent-tree.c:5700 btrfs_free_block_groups+0x261/0x3eb [btrfs] [ 2837.747955] Modules linked in: dm_flakey dm_mod ppdev parport_pc psmouse parport sg pcspkr acpi_cpufreq tpm_tis tpm_tis_core i2c_piix4 i2c_core evdev tpm button serio_raw sunrpc loop autofs4 ext4 crc16 jbd2 mbcache btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sr_mod cdrom sd_mod ata_generic virtio_scsi ata_piix libata virtio_pci virtio_ring virtio e1000 scsi_mod floppy [ 2837.755395] CPU: 8 PID: 2474 Comm: umount Tainted: G W 4.10.0-rc8-btrfs-next-43+ #1 [ 2837.756769] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014 [ 2837.758526] Call Trace: [ 2837.758925] dump_stack+0x68/0x92 [ 2837.759383] __warn+0xc2/0xdd [ 2837.759383] warn_slowpath_null+0x1d/0x1f [ 2837.759383] btrfs_free_block_groups+0x261/0x3eb [btrfs] [ 2837.759383] close_ctree+0x1dd/0x2e1 [btrfs] [ 2837.759383] ? evict_inodes+0x132/0x141 [ 2837.759383] btrfs_put_super+0x15/0x17 [btrfs] [ 2837.759383] generic_shutdown_super+0x6a/0xeb [ 2837.759383] kill_anon_super+0x12/0x1c [ 2837.759383] btrfs_kill_super+0x16/0x21 [btrfs] [ 2837.759383] deactivate_locked_super+0x30/0x68 [ 2837.759383] deactivate_super+0x36/0x39 [ 2837.759383] cleanup_mnt+0x58/0x76 [ 2837.759383] __cleanup_mnt+0x12/0x14 [ 2837.759383] task_work_run+0x77/0x9b [ 2837.759383] prepare_exit_to_usermode+0x9d/0xc5 [ 2837.759383] syscall_return_slowpath+0x196/0x1b9 [ 2837.759383] entry_SYSCALL_64_fastpath+0xab/0xad [ 2837.759383] RIP: 0033:0x7f3ef3e6b9a7 [ 2837.759383] RSP: 002b:00007ffdd0d8de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 [ 2837.759383] RAX: 0000000000000000 RBX: 0000556f76a39060 RCX: 00007f3ef3e6b9a7 [ 2837.759383] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000556f76a3f910 [ 2837.759383] RBP: 0000556f76a3f910 R08: 0000556f76a3e670 R09: 0000000000000015 [ 2837.759383] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007f3ef436ce64 [ 2837.759383] R13: 0000000000000000 R14: 0000556f76a39240 R15: 00007ffdd0d8e0e0 [ 2837.777063] ---[ end trace e79345fe24b30b8f ]--- [ 2837.778235] ------------[ cut here ]------------ [ 2837.778856] WARNING: CPU: 8 PID: 2474 at fs/btrfs/extent-tree.c:9825 btrfs_free_block_groups+0x348/0x3eb [btrfs] [ 2837.791385] Modules linked in: dm_flakey dm_mod ppdev parport_pc psmouse parport sg pcspkr acpi_cpufreq tpm_tis tpm_tis_core i2c_piix4 i2c_core evdev tpm button serio_raw sunrpc loop autofs4 ext4 crc16 jbd2 mbcache btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod sr_mod cdrom sd_mod ata_generic virtio_scsi ata_piix libata virtio_pci virtio_ring virtio e1000 scsi_mod floppy [ 2837.797711] CPU: 8 PID: 2474 Comm: umount Tainted: G W 4.10.0-rc8-btrfs-next-43+ #1 [ 2837.798594] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014 [ 2837.800118] Call Trace: [ 2837.800515] dump_stack+0x68/0x92 [ 2837.801015] __warn+0xc2/0xdd [ 2837.801471] warn_slowpath_null+0x1d/0x1f [ 2837.801698] btrfs_free_block_groups+0x348/0x3eb [btrfs] [ 2837.801698] close_ctree+0x1dd/0x2e1 [btrfs] [ 2837.801698] ? evict_inodes+0x132/0x141 [ 2837.801698] btrfs_put_super+0x15/0x17 [btrfs] [ 2837.801698] generic_shutdown_super+0x6a/0xeb [ 2837.801698] kill_anon_super+0x12/0x1c [ 2837.801698] btrfs_kill_super+0x16/0x21 [btrfs] [ 2837.801698] deactivate_locked_super+0x30/0x68 [ 2837.801698] deactivate_super+0x36/0x39 [ 2837.801698] cleanup_mnt+0x58/0x76 [ 2837.801698] __cleanup_mnt+0x12/0x14 [ 2837.801698] task_work_run+0x77/0x9b [ 2837.801698] prepare_exit_to_usermode+0x9d/0xc5 [ 2837.801698] syscall_return_slowpath+0x196/0x1b9 [ 2837.801698] entry_SYSCALL_64_fastpath+0xab/0xad [ 2837.801698] RIP: 0033:0x7f3ef3e6b9a7 [ 2837.801698] RSP: 002b:00007ffdd0d8de58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 [ 2837.801698] RAX: 0000000000000000 RBX: 0000556f76a39060 RCX: 00007f3ef3e6b9a7 [ 2837.801698] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000556f76a3f910 [ 2837.801698] RBP: 0000556f76a3f910 R08: 0000556f76a3e670 R09: 0000000000000015 [ 2837.801698] R10: 00000000000006b4 R11: 0000000000000246 R12: 00007f3ef436ce64 [ 2837.801698] R13: 0000000000000000 R14: 0000556f76a39240 R15: 00007ffdd0d8e0e0 [ 2837.818441] ---[ end trace e79345fe24b30b90 ]--- [ 2837.818991] BTRFS info (device sdc): space_info 1 has 7974912 free, is not full [ 2837.819830] BTRFS info (device sdc): space_info total=8388608, used=417792, pinned=0, reserved=0, may_use=18446744073709547520, readonly=0 What happens in the above example is the following: 1) When punching the hole, at btrfs_punch_hole(), the variable tail_len is set to 2048 (as tail_start is 148Kb + 1 and offset + len is 150Kb). This results in the creation of an extent map with a length of 2Kb starting at file offset 148Kb, through find_first_non_hole() -> btrfs_get_extent(). 2) The second write (first write after the hole punch operation), sets the range [50Kb, 152Kb[ to delalloc. 3) The third write, at btrfs_find_new_delalloc_bytes(), sees the extent map covering the range [148Kb, 150Kb[ and ends up calling set_extent_bit() for the same range, which results in splitting an existing extent state record, covering the range [148Kb, 152Kb[ into two 2Kb extent state records, covering the ranges [148Kb, 150Kb[ and [150Kb, 152Kb[. 4) Finally at lock_and_cleanup_extent_if_need(), immediately after calling btrfs_find_new_delalloc_bytes() we clear the delalloc bit from the range [100Kb, 152Kb[ which results in the btrfs_clear_bit_hook() callback being invoked against the two 2Kb extent state records that cover the ranges [148Kb, 150Kb[ and [150Kb, 152Kb[. When called against the first 2Kb extent state, it calls btrfs_delalloc_release_metadata() with a length argument of 2048 bytes. That function rounds up the length to a sector size aligned length, so it ends up considering a length of 4096 bytes, and then calls calc_csum_metadata_size() which results in decrementing the inode's csum_bytes counter by 4096 bytes, so after it stays a value of 0 bytes. Then the same happens when btrfs_clear_bit_hook() is called against the second extent state that has a length of 2Kb, covering the range [150Kb, 152Kb[, the length is rounded up to 4096 and calc_csum_metadata_size() ends up being called to decrement 4096 bytes from the inode's csum_bytes counter, which at that time has a value of 0, leading to an underflow, which is exactly what triggers the first warning, at btrfs_destroy_inode(). All the other warnings relate to several space accounting counters that underflow as well due to similar reasons. A similar case but where the hole punching operation creates an extent map with a start offset not aligned to the sector size is the following: $ mkfs.btrfs -f /dev/sdb $ mount /dev/sdb /mnt $ xfs_io -f -c "fpunch 695K 820K" $SCRATCH_MNT/bar $ xfs_io -c "pwrite -S 0xaa 1008K 307K" $SCRATCH_MNT/bar $ xfs_io -c "pwrite -S 0xbb -b 630K 1073K 630K" $SCRATCH_MNT/bar $ xfs_io -c "pwrite -S 0xcc -b 459K 1068K 459K" $SCRATCH_MNT/bar $ umount /mnt During the unmount operation we get similar traces for the same reasons as in the first example. So fix the hole punching operation to make sure it never creates extent maps with a length that is not aligned to the sector size nor with a start offset that is not aligned to the sector size, as this breaks all assumptions and it's a land mine. Fixes: d7781546 ("btrfs: Avoid trucating page or punching hole in a already existed hole.") Cc: <stable@vger.kernel.org> Signed-off-by:
Liu Bo <bo.li.liu@oracle.com> Signed-off-by:
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Jeff Mahoney authored
On an uncontended system, we can end up hitting soft lockups while doing replace_path. At the core, and frequently called is btrfs_qgroup_trace_leaf_items, so it makes sense to add a cond_resched there. Signed-off-by:
Jeff Mahoney <jeffm@suse.com> Reviewed-by:
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- 20 Jun, 2017 5 commits
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Nikolay Borisov authored
We got an internal report about a file system not wanting to mount following 99e3ecfc ("Btrfs: add more validation checks for superblock"). BTRFS error (device sdb1): super_total_bytes 1000203816960 mismatch with fs_devices total_rw_bytes 1000203820544 Subtracting the numbers we get a difference of less than a 4kb. Upon closer inspection it became apparent that mkfs actually rounds down the size of the device to a multiple of sector size. However, the same cannot be said for various functions which modify the total size and are called from btrfs_balance as well as when adding a new device. So this patch ensures that values being saved into on-disk data structures are always rounded down to a multiple of sectorsize. Signed-off-by:
Nikolay Borisov <nborisov@suse.com> Signed-off-by:
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Nikolay Borisov authored
The device->total_bytes member needs to always be rounded down to sectorsize so that it corresponds to the value of super->total_bytes. However, there are multiple places where the setter is fed a value which is not rounded which can cause a fs to be unmountable due to the check introduced in 99e3ecfc ("Btrfs: add more validation checks for superblock"). This patch implements the getter/setter manually so that in a later patch I can add necessary code to catch offenders. Signed-off-by:
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David Sterba authored
The mount option alloc_start was used in the past for debugging and stressing the chunk allocator. Not meant to be used by users, so we're not breaking anybody's setup. There was some added complexity handling changes of the value and when it was not same as default. Such code has likely been untested and I think it's better to remove it. This patch kills all use of alloc_start, and by doing that also fixes a bug when alloc_size is set, potentially called from statfs: in btrfs_calc_avail_data_space, traversing the list in RCU, the RCU protection is temporarily dropped so btrfs_account_dev_extents_size can be called and then RCU is locked again! Doing that inside list_for_each_entry_rcu is just asking for trouble, but unlikely to be observed in practice. Signed-off-by: -
David Sterba authored
We can keep the state among the other fs_info flags, there's no reason why fs_frozen would need to be separate. Reviewed-by:
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David Sterba authored
The pattern when err is used for function exit and ret is used for return values of callees is not used here. Reviewed-by:
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- 19 Jun, 2017 29 commits
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David Sterba authored
The function is called from ioctl context and we don't hold any locks that take part in writeback. Right now it's only fs_info::volume_mutex. Reviewed-by:
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David Sterba authored
We don't hold any locks here. Inidirectly called from statfs. Reviewed-by:
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Nikolay Borisov authored
Signed-off-by:
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Anand Jain authored
Submit and wait parts of write_dev_flush() can be split into two separate functions for better readability. Signed-off-by:
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Anand Jain authored
There is no extra benefit to count null bdev during the submit loop, as these null devices will be anyway checked during command completion device loop just after the submit loop. We are holding the device_list_mutex, the device->bdev status won't change in between. Signed-off-by:
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Anand Jain authored
Since commit "btrfs: btrfs_io_bio_alloc never fails, skip error handling" write_dev_flush will not return ENOMEM in the sending part. We do not need to check for it in the callers. Signed-off-by:
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Timofey Titovets authored
We already skip storing data where compression does not make the result at least one byte less. Let's make the logic better and check that compression frees at least one sector size of bytes, otherwise it's not that useful. Signed-off-by:
Timofey Titovets <nefelim4ag@gmail.com> Reviewed-by:
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David Sterba authored
We can hardcode GFP_NOFS to btrfs_io_bio_alloc, although it means we change it back from GFP_KERNEL in scrub. I'd rather save a few stack bytes from not passing the gfp flags in the remaining, more imporatant, contexts and the bio allocating API now looks more consistent. Reviewed-by:
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David Sterba authored
We use btrfs_bioset for bios and ask to allocate the entire size of btrfs_io_bio from btrfs bio_alloc_bioset. The member 'bio' is initialized but the bytes from 0 to offset of 'bio' are left uninitialized. Although we initialize some of the members in our helpers, we should initialize the whole structures. Reviewed-by:
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David Sterba authored
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Hans van Kranenburg authored
A programmer who is trying to implement calling the btrfs SEARCH or SEARCH_V2 ioctl will probably soon end up reading this struct definition. Properly document the input fields to prevent common misconceptions: 1. The search space is linear, not 3 dimensional. The invidual min/max values for objectid, type and offset cannot be used to filter the result, they only define the endpoints of an interval. 2. The transaction id (a.k.a. generation) filter applies only on transaction id of the last COW operation on a whole metadata page, not on individual items. Ad 1. The first misunderstanding was helped by the previous misleading comments on min/max type and offset: "keys returned will be >= min and <= max". Ad 2. For example, running btrfs balance will happily cause rewriting of metadata pages that contain a filesystem tree of a read only subvolume, causing transids to be increased. Also, improve descriptions of tree_id and nr_items and add in/out annotations. Signed-off-by:
Hans van Kranenburg <hans.van.kranenburg@mendix.com> Signed-off-by:
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Liu Bo authored
Currently dio read also goes to verify checksum if -EIO has been returned, although it usually fails on checksum, it's not necessary at all, we could directly check if there is another copy to read. And with this, the behavior of dio read is now consistent with that of buffered read. Signed-off-by:
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Liu Bo authored
With raid1 profile, dio read isn't tolerating IO errors if read length is less than the stripe length (64K). Our bio didn't get split in btrfs_submit_direct_hook() if (dip->flags & BTRFS_DIO_ORIG_BIO_SUBMITTED) is true and that happens when the read length is less than 64k. In this case, if the underlying device returns error somehow, bio->bi_error has recorded that error. If we could recover the correct data from another copy in profile raid1/10/5/6, with btrfs_subio_endio_read() returning 0, bio would have the correct data in its vector, but bio->bi_error is not updated accordingly so that the following dio_end_io(dio_bio, bio->bi_error) makes directIO think this read has failed. This fixes the problem by setting bio's error to 0 if a good copy has been found. Signed-off-by:
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David Sterba authored
Most callers of btrfs_bio_alloc convert from bytes to sectors. Hide that in the helper and simplify the logic in the callsers. Reviewed-by:
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David Sterba authored
compressed_bio_alloc is now a trivial wrapper around btrfs_bio_alloc, no point keeping it. The error handling can be simplified, as we know btrfs_bio_alloc will never fail. Reviewed-by:
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David Sterba authored
All callers pass gfp_flags=GFP_NOFS and nr_vecs=BIO_MAX_PAGES. submit_extent_page adds __GFP_HIGH that does not make a difference in our case as it allows access to memory reserves but otherwise does not change the constraints. Signed-off-by: -
David Sterba authored
All callers pass GFP_NOFS. Reviewed-by:
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David Sterba authored
Update direct callers of btrfs_io_bio_alloc that do error handling, that we can now remove. Reviewed-by:
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David Sterba authored
Update direct callers of btrfs_bio_clone that do error handling, that we can now remove. Reviewed-by:
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David Sterba authored
Update direct callers of btrfs_bio_alloc that do error handling, that we can now remove. Reviewed-by:
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David Sterba authored
Christoph pointed out that bio allocations backed by a bioset will never fail. As we always use a bioset for all bio allocations, we can skip the error handling. This patch adjusts our low-level helpers, the cascaded changes to all callers will come next. CC: Liu Bo <bo.li.liu@oracle.com> Reviewed-by:
Christoph Hellwig <hch@lst.de> Reviewed-by:
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David Sterba authored
The compression workspace buffers are larger than a page so we use vmalloc, unconditionally. This is not always necessary as there might be contiguous memory available. Let's use the kvmalloc helpers that will try kmalloc first and fallback to vmalloc. For that they require GFP_KERNEL flags. As we now have the alloc_workspace calls protected by memalloc_nofs in the critical contexts, we can safely use GFP_KERNEL. Signed-off-by: -
David Sterba authored
As alloc_workspace is now protected by memalloc_nofs where needed, we can switch the kmalloc to use GFP_KERNEL. Reviewed-by:
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David Sterba authored
The workspaces are preallocated at the beginning where we can safely use GFP_KERNEL, but in some cases the find_workspace might reach the allocation again, now in a more restricted context when the bios or pages are being compressed. To avoid potential lockup when alloc_workspace -> vmalloc would silently use the GFP_KERNEL, add the memalloc_nofs helpers around the critical call site. Reviewed-by:
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David Sterba authored
As we don't use vmalloc/vzalloc/vfree directly in ctree.c, we can now use the proper header that defines kvmalloc. Signed-off-by: -
David Sterba authored
Now that init_ipath is called either from a safe context or with memalloc_nofs protection, we can switch to GFP_KERNEL allocations in init_path and init_data_container. Reviewed-by:
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David Sterba authored
init_ipath is called from a safe ioctl context and from scrub when printing an error. The protection is added for three reasons: * init_data_container calls vmalloc and this does not work as expected in the GFP_NOFS context, so this silently does GFP_KERNEL and might deadlock in some cases * keep the context constraint of GFP_NOFS, used by scrub * we want to use GFP_KERNEL unconditionally inside init_ipath or its callees Reviewed-by:
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David Sterba authored
We use a growing buffer for xattrs larger than a page size, at some point vmalloc is unconditionally used for larger buffers. We can still try to avoid it using the kvmalloc helper. Reviewed-by:
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David Sterba authored
The logic of kmalloc and vmalloc fallback is opencoded in several places, we can now use the existing helper. Signed-off-by:
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