- 26 Oct, 2021 40 commits
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Qu Wenruo authored
Function repair_io_failure() is no longer used out of extent_io.c since commit 8b9b6f25 ("btrfs: scrub: cleanup the remaining nodatasum fixup code"), which removes the last external caller. Reviewed-by:
Nikolay Borisov <nborisov@suse.com> Signed-off-by:
Qu Wenruo <wqu@suse.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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Filipe Manana authored
When logging a regular file in full sync mode, we are currently committing its delayed inode item. This is to ensure that we never miss copying the inode item, with its most up to date data, into the log tree. However that is not necessary since commit e4545de5 ("Btrfs: fix fsync data loss after append write"), because even if we don't find the leaf with the inode item when looking for leaves that changed in the current transaction, we end up logging the inode item later using the in-memory content. In case we find the leaf containing the inode item, we already end up using the in-memory inode for filling the inode item in the log tree, and not the inode item that is in the fs/subvolume tree, as it might be not up to date (copy_items() -> fill_inode_item()). So don't commit the delayed inode item, which brings a couple of benefits: 1) Avoid writing the inode item to the fs/subvolume btree, saving time and reducing lock contention on the btree; 2) In case no other item for the inode was changed, added or deleted in the same leaf where the inode item is located, we ended up copying all the items in that leaf to the log tree - it's harmless from a functional point of view, but it wastes time and log tree space. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 10/10 and the following test results compare a branch with the whole patch set applied versus a branch without any of the patches applied. The following script was used to test dbench with 8 and 16 jobs on a machine with 12 cores, 64G of RAM, a NVME device and using a non-debug kernel config (Debian's default): $ cat test.sh #!/bin/bash if [ $# -ne 1 ]; then echo "Use $0 NUM_JOBS" exit 1 fi NUM_JOBS=$1 DEV=/dev/nvme0n1 MNT=/mnt/nvme0n1 MOUNT_OPTIONS="-o ssd" MKFS_OPTIONS="-m single -d single" echo "performance" | \ tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor mkfs.btrfs -f $MKFS_OPTIONS $DEV mount $MOUNT_OPTIONS $DEV $MNT dbench -D $MNT -t 120 $NUM_JOBS umount $MNT The results were the following: 8 jobs, before patchset: Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 4113896 0.009 238.665 Close 3021699 0.001 0.590 Rename 174215 0.082 238.733 Unlink 830977 0.049 238.642 Deltree 96 2.232 8.022 Mkdir 48 0.003 0.005 Qpathinfo 3729013 0.005 2.672 Qfileinfo 653206 0.001 0.152 Qfsinfo 683866 0.002 0.526 Sfileinfo 335055 0.004 1.571 Find 1441800 0.016 4.288 WriteX 2049644 0.010 3.982 ReadX 6449786 0.003 0.969 LockX 13400 0.002 0.043 UnlockX 13400 0.001 0.075 Flush 288349 2.521 245.516 Throughput 1075.73 MB/sec 8 clients 8 procs max_latency=245.520 ms 8 jobs, after patchset: Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 4154282 0.009 156.675 Close 3051450 0.001 0.843 Rename 175912 0.072 4.444 Unlink 839067 0.048 66.050 Deltree 96 2.131 5.979 Mkdir 48 0.002 0.004 Qpathinfo 3765575 0.005 3.079 Qfileinfo 659582 0.001 0.099 Qfsinfo 690474 0.002 0.155 Sfileinfo 338366 0.004 1.419 Find 1455816 0.016 3.423 WriteX 2069538 0.010 4.328 ReadX 6512429 0.003 0.840 LockX 13530 0.002 0.078 UnlockX 13530 0.001 0.051 Flush 291158 2.500 163.468 Throughput 1105.45 MB/sec 8 clients 8 procs max_latency=163.474 ms +2.7% throughput, -40.1% max latency 16 jobs, before patchset: Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 5457602 0.033 337.098 Close 4008979 0.002 2.018 Rename 231051 0.323 254.054 Unlink 1102209 0.202 337.243 Deltree 160 6.521 31.720 Mkdir 80 0.003 0.007 Qpathinfo 4946147 0.014 6.988 Qfileinfo 867440 0.001 1.642 Qfsinfo 907081 0.003 1.821 Sfileinfo 444433 0.005 2.053 Find 1912506 0.067 7.854 WriteX 2724852 0.018 7.428 ReadX 8553883 0.003 2.059 LockX 17770 0.003 0.350 UnlockX 17770 0.002 0.627 Flush 382533 2.810 353.691 Throughput 1413.09 MB/sec 16 clients 16 procs max_latency=353.696 ms 16 jobs, after patchset: Operation Count AvgLat MaxLat ---------------------------------------- NTCreateX 5393156 0.034 303.181 Close 3961986 0.002 1.502 Rename 228359 0.320 253.379 Unlink 1088920 0.206 303.409 Deltree 160 6.419 30.088 Mkdir 80 0.003 0.004 Qpathinfo 48879676 0.015 7.722 Qfileinfo 857408 0.001 1.651 Qfsinfo 896343 0.002 2.147 Sfileinfo 439317 0.005 4.298 Find 1890018 0.073 8.347 WriteX 2693356 0.018 6.373 ReadX 8453485 0.003 3.836 LockX 17562 0.003 0.486 UnlockX 17562 0.002 0.635 Flush 378023 2.802 315.904 Throughput 1454.46 MB/sec 16 clients 16 procs max_latency=315.910 ms +2.9% throughput, -11.3% max latency Signed-off-by:
Filipe Manana <fdmanana@suse.com> Signed-off-by:
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Filipe Manana authored
When logging an extent, in the fast fsync path, we always attempt do drop or trim any existing extents with a range that match or overlap the range of the extent we are about to log. We do that through a call to btrfs_drop_extents(). However this is not needed when we are logging the inode for the first time in the current transaction, since we have no inode items of the inode in the log tree. Calling btrfs_drop_extents() does a deletion search on the log tree, which is expensive when we have concurrent tasks accessing the log tree because a deletion search always acquires a write lock on the extent buffers at levels 2, 1 and 0, adding significant lock contention, specially taking into account the height of a log tree rarely (if ever) goes beyond 2 or 3, due to its short life. So skip the call to btrfs_drop_extents() when the inode was not previously logged in the current transaction. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 9/10 and test results are listed in the change log of the last patch in the set. Signed-off-by:
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Filipe Manana authored
If we are logging that an inode exists and the inode was not logged before, we can avoid searching in the log tree for the inode item since we know it does not exists. That wastes time and adds more lock contention on the extent buffers of the log tree when there are other tasks that are logging other inodes. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 8/10 and test results are listed in the change log of the last patch in the set. Signed-off-by:
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Filipe Manana authored
Whenever we are logging a file inode in full sync mode we call btrfs_truncate_inode_items() to delete items of the inode we may have previously logged. That results in doing a btree search for deletion, which is expensive because it always acquires write locks for extent buffers at levels 2, 1 and 0, and it balances any node that is less than half full. Acquiring the write locks can block the task if the extent buffers are already locked by another task or block other tasks attempting to lock them, which is specially bad in case of log trees since they are small due to their short life, with a root node at a level typically not greater than level 2. If we know that we are logging the inode for the first time in the current transaction, we can skip the call to btrfs_truncate_inode_items(), avoiding the deletion search. This change does that. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 7/10 and test results are listed in the change log of the last patch in the set. Signed-off-by:
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Filipe Manana authored
Move the call to btrfs_truncate_inode_items(), and the surrounding retry loop, into a local helper function. This avoids some repetition and avoids making the next change a bit awkward due to a bit of too much indentation. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 6/10 and test results are listed in the change log of the last patch in the set. Signed-off-by:
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Filipe Manana authored
Whenever we are logging a directory inode, logging that an inode exists or logging an inode that has changes in its references or xattrs, we attempt to delete items of this inode we may have previously logged (through calls to drop_objectid_items()). That attempt does a btree search for deletion, which is expensive because it always acquires write locks for extent buffers at levels 2, 1 and 0, and it balances any node that is less than half full. Acquiring the write locks can block the task if the extent buffers are already locked or block other tasks attempting to lock them, which is specially bad in case of log trees since they are small due to their short life, with a root node at a level typically not greater than level 2. If we know that we are logging the inode for the first time in the current transaction, we can skip the search. This change does that. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 5/10 and test results are listed in the change log of the last patch in the set. Signed-off-by:
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Filipe Manana authored
When we are logging a new name for an inode, due to a link or rename operation, if the inode has ancestor inodes that are new, created in the current transaction, we need to log that these inodes exist. To ensure that a subsequent explicit fsync on one of these ancestor inodes does sync the log, we don't set the logged_trans field of these inodes. This was done in commit 75b463d2 ("btrfs: do not commit logs and transactions during link and rename operations"), to avoid syncing a log after a rename or link operation. In order to allow for future changes to do some optimizations, change this behaviour to always update the logged_trans of any logged inode and don't update the last_log_commit of the inode if we are logging that it exists. This accomplishes that same objective with simpler logic, allowing for some optimizations in the next patches. So just do that simplification. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 4/10 and test results are listed in the change log of the last patch in the set. Signed-off-by:
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Filipe Manana authored
When logging a new name for an inode, due to a link or rename operation, we don't need to log all new dentries of the parent directories and their subdirectories. We only want to log the names of the inode and that any new parent directories exist. So in this case don't trigger logging of the new dentries, that is only need when doing an explicit fsync on a directory or on a file which requires logging its parent directories. This avoids unnecessary work and reduces contention on the extent buffers of a log tree. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 3/10 and test results are listed in the change log of the last patch in the set. Signed-off-by:
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Filipe Manana authored
Since commit 75b463d2 ("btrfs: do not commit logs and transactions during link and rename operations"), we always pass a non-NULL log context to btrfs_log_inode_parent() and therefore to all the functions that it calls. So remove the checks we have all over the place that test for a NULL log context, making the code shorter and easier to read, as well as reducing the size of the generated code. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 2/10 and test results are listed in the change log of the last patch in the set. Signed-off-by:
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Filipe Manana authored
In case an inode was never logged since it was loaded from disk and was modified in the current transaction (its ->last_trans matches the ID of the current transaction), inode_logged() returns true even if there's no existing log tree. In this case we can simply check if a log tree exists and return false if it does not. This avoids a caller of inode_logged() doing some unnecessary, but harmless, work. For btrfs_log_new_name() it avoids it logging an inode in case it was never logged since it was loaded from disk and there is currently no log tree for the inode's root. For the remaining callers of inode_logged(), btrfs_del_dir_entries_in_log() and btrfs_del_inode_ref_in_log(), it has no effect since they already check if a log tree exists through their calls to join_running_log_trans(). So just add a check to inode_logged() to verify if a log tree exists, and return false if it does not. This patch is part of a patch set comprised of the following patches: btrfs: check if a log tree exists at inode_logged() btrfs: remove no longer needed checks for NULL log context btrfs: do not log new dentries when logging that a new name exists btrfs: always update the logged transaction when logging new names btrfs: avoid expensive search when dropping inode items from log btrfs: add helper to truncate inode items when logging inode btrfs: avoid expensive search when truncating inode items from the log btrfs: avoid search for logged i_size when logging inode if possible btrfs: avoid attempt to drop extents when logging inode for the first time btrfs: do not commit delayed inode when logging a file in full sync mode This is patch 1/10 and test results are listed in the change log of the last patch in the set. Signed-off-by:
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Anand Jain authored
There were few lockdep warnings because btrfs_show_devname() was using device_list_mutex as recorded in the commits: 0ccd0528 ("btrfs: fix a possible umount deadlock") 779bf3fe ("btrfs: fix lock dep warning, move scratch dev out of device_list_mutex and uuid_mutex") And finally, commit 88c14590 ("btrfs: use RCU in btrfs_show_devname for device list traversal") removed the device_list_mutex from btrfs_show_devname for performance reasons. This patch removes a stale comment about the function btrfs_show_devname and device_list_mutex. Signed-off-by:
Anand Jain <anand.jain@oracle.com> Reviewed-by:
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Anand Jain authored
When we add a device to the seed filesystem (sprouting) it is a new filesystem (and fsid) on the device added. Update the latest_dev so that /proc/self/mounts shows the correct device. Example: $ btrfstune -S1 /dev/vg/seed $ mount /dev/vg/seed /btrfs mount: /btrfs: WARNING: device write-protected, mounted read-only. $ cat /proc/self/mounts | grep btrfs /dev/mapper/vg-seed /btrfs btrfs ro,relatime,space_cache,subvolid=5,subvol=/ 0 0 $ btrfs dev add -f /dev/vg/new /btrfs Before: $ cat /proc/self/mounts | grep btrfs /dev/mapper/vg-seed /btrfs btrfs ro,relatime,space_cache,subvolid=5,subvol=/ 0 0 After: $ cat /proc/self/mounts | grep btrfs /dev/mapper/vg-new /btrfs btrfs ro,relatime,space_cache,subvolid=5,subvol=/ 0 0 Tested-by:
Su Yue <l@damenly.su> Signed-off-by:
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Anand Jain authored
The test case btrfs/238 reports the warning below: WARNING: CPU: 3 PID: 481 at fs/btrfs/super.c:2509 btrfs_show_devname+0x104/0x1e8 [btrfs] CPU: 2 PID: 1 Comm: systemd Tainted: G W O 5.14.0-rc1-custom #72 Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 Call trace: btrfs_show_devname+0x108/0x1b4 [btrfs] show_mountinfo+0x234/0x2c4 m_show+0x28/0x34 seq_read_iter+0x12c/0x3c4 vfs_read+0x29c/0x2c8 ksys_read+0x80/0xec __arm64_sys_read+0x28/0x34 invoke_syscall+0x50/0xf8 do_el0_svc+0x88/0x138 el0_svc+0x2c/0x8c el0t_64_sync_handler+0x84/0xe4 el0t_64_sync+0x198/0x19c Reason: While btrfs_prepare_sprout() moves the fs_devices::devices into fs_devices::seed_list, the btrfs_show_devname() searches for the devices and found none, leading to the warning as in above. Fix: latest_dev is updated according to the changes to the device list. That means we could use the latest_dev->name to show the device name in /proc/self/mounts, the pointer will be always valid as it's assigned before the device is deleted from the list in remove or replace. The RCU protection is sufficient as the device structure is freed after synchronization. Reported-by:
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Anand Jain authored
In preparation to fix a bug in btrfs_show_devname(). Convert fs_devices::latest_bdev type from struct block_device to struct btrfs_device and, rename the member to fs_devices::latest_dev. So that btrfs_show_devname() can use fs_devices::latest_dev::name. Tested-by:
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Naohiro Aota authored
We will no longer write to a relocating block group. So, we can finish it now. Signed-off-by:
Naohiro Aota <naohiro.aota@wdc.com> Signed-off-by:
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Naohiro Aota authored
If we have written to the zone capacity, the device automatically deactivates the zone. Sync up block group side (the active BG list and zone_is_active flag) with it. We need to do it both on data BGs and metadata BGs. On data side, we add a hook to btrfs_finish_ordered_io(). On metadata side, we use end_extent_buffer_writeback(). To reduce excess lookup of a block group, we mark the last extent buffer in a block group with EXTENT_BUFFER_ZONE_FINISH flag. This cannot be done for data (ordered_extent), because the address may change due to REQ_OP_ZONE_APPEND. Signed-off-by:
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Naohiro Aota authored
The current extent allocator tries to allocate a new block group when the existing block groups do not have enough space. On a ZNS device, a new block group means a new active zone. If the number of active zones has already reached the max_active_zones, activating a new zone needs to finish an existing zone, leading to wasting the free space there. So, instead, it should reuse the existing active block groups as much as possible when we can't activate any other zones without sacrificing an already activated block group. While at it, I converted find_free_extent_update_loop() to check the found_extent() case early and made the other conditions simpler. Signed-off-by:
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Naohiro Aota authored
We are passing too many variables as it is from btrfs_reserve_extent() to find_free_extent(). The next commit will add min_alloc_size to ffe_ctl, and that means another pass-through argument. Take this opportunity to move ffe_ctl one level up and drop the redundant arguments. Signed-off-by:
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Naohiro Aota authored
Activate new block group at btrfs_make_block_group(). We do not check the return value. If failed, we can try again later at the actual extent allocation phase. Signed-off-by:
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Naohiro Aota authored
Activate a block group when trying to allocate an extent from it. We check read-only case and no space left case before trying to activate a block group not to consume the number of active zones uselessly. Signed-off-by:
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Naohiro Aota authored
Load activeness of underlying zones of a block group. When underlying zones are active, we add the block group to the fs_info->zone_active_bgs list. Signed-off-by:
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Naohiro Aota authored
Add zone_is_active flag to btrfs_block_group. This flag indicates the underlying zones are all active. Such zone active block groups are tracked by fs_info->active_bg_list. btrfs_dev_{set,clear}_active_zone() take responsibility for the underlying device part. They set/clear the bitmap to indicate zone activeness and count the number of zones we can activate left. btrfs_zone_{activate,finish}() take responsibility for the logical part and the list management. In addition, btrfs_zone_finish() wait for any writes on it and send REQ_OP_ZONE_FINISH to the zone. Signed-off-by: -
Naohiro Aota authored
We will use a block group's physical location to track active zones and finish fully written zones in the following commits. Since the zone activation is done in the extent allocation context which already holding the tree locks, we can't query the chunk tree for the physical locations. So, copy the location info into a block group and use it for activation. Signed-off-by:
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Naohiro Aota authored
The ZNS specification defines a limit on the number of zones that can be in the implicit open, explicit open or closed conditions. Any zone with such condition is defined as an active zone and correspond to any zone that is being written or that has been only partially written. If the maximum number of active zones is reached, we must either reset or finish some active zones before being able to chose other zones for storing data. Load queue_max_active_zones() and track the number of active zones left on the device. Signed-off-by:
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Naohiro Aota authored
If there is no more space left for a new superblock in a superblock zone, then it is better to ZONE_FINISH the zone and frees up the active zone count. Since btrfs_advance_sb_log() can now issue REQ_OP_ZONE_FINISH, we also need to convert it to return int for the error case. Signed-off-by:
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Naohiro Aota authored
sb_write_pointer() returns the write position of next superblock. For READ, we need a previous location. When the pointer is at the head, the previous one is the last one of the other zone. Calculate the last one's position from zone capacity. Reviewed-by:
Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by:
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Naohiro Aota authored
We cannot write beyond zone capacity. So, we should consider a zone as "full" when the write pointer goes beyond capacity - the size of super info. Also, take this opportunity to replace a subtle duplicated code with a loop and fix a typo in comment. Reviewed-by:
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Naohiro Aota authored
With the introduction of zone capacity, the range [capacity, length] is always zone unusable. Counting this region as a reclaim target will cause reclaiming too early. Reclaim block groups based on bytes that can be usable after resetting. Reviewed-by:
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Naohiro Aota authored
Now that we introduced capacity in a block group, we need to calculate free space using the capacity instead of the length. Thus, bytes we account capacity - alloc_pointer as free, and account bytes [capacity, length] as zone unusable. Reviewed-by:
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Naohiro Aota authored
btrfs_free_excluded_extents() is not neccessary for btrfs_calc_zone_unusable() and it makes btrfs_calc_zone_unusable() difficult to reuse. Move it out and call btrfs_free_excluded_extents() in proper context. Reviewed-by:
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Naohiro Aota authored
The ZNS specification introduces the concept of a Zone Capacity. A zone capacity is an additional per-zone attribute that indicates the number of usable logical blocks within each zone, starting from the first logical block of each zone. It is always smaller or equal to the zone size. With the SINGLE profile, we can set a block group's "capacity" as the same as the underlying zone's Zone Capacity. We will limit the allocation not to exceed in a following commit. Reviewed-by:
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Qu Wenruo authored
With the new infrastructure which has taken subpage into consideration, now we should be safe to allow defrag to work for subpage case. Signed-off-by:
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Qu Wenruo authored
Now the old infrastructure can all be removed, defrag Signed-off-by:
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Qu Wenruo authored
The function defrag_one_cluster() is able to defrag one range well enough, we only need to do preparation for it, including: - Clamp and align the defrag range - Exclude invalid cases - Proper inode locking The old infrastructures will not be removed in this patch, as it would be too noisy to review. Signed-off-by:
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Qu Wenruo authored
This new helper, defrag_one_cluster(), will defrag one cluster (at most 256K): - Collect all initial targets - Kick in readahead when possible - Call defrag_one_range() on each initial target With some extra range clamping. - Update @sectors_defragged parameter This involves one behavior change, the defragged sectors accounting is no longer as accurate as old behavior, as the initial targets are not consistent. We can have new holes punched inside the initial target, and we will skip such holes later. But the defragged sectors accounting doesn't need to be that accurate anyway, thus I don't want to pass those extra accounting burden into defrag_one_range(). Signed-off-by:
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Qu Wenruo authored
A new helper, defrag_one_range(), is introduced to defrag one range. This function will mostly prepare the needed pages and extent status for defrag_one_locked_target(). As we can only have a consistent view of extent map with page and extent bits locked, we need to re-check the range passed in to get a real target list for defrag_one_locked_target(). Since defrag_collect_targets() will call defrag_lookup_extent() and lock extent range, we also need to teach those two functions to skip extent lock. Thus new parameter, @locked, is introduced to skip extent lock if the caller has already locked the range. Signed-off-by:
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Qu Wenruo authored
A new helper, defrag_one_locked_target(), introduced to do the real part of defrag. The caller needs to ensure both page and extents bits are locked, and no ordered extent exists for the range, and all writeback is finished. The core defrag part is pretty straight-forward: - Reserve space - Set extent bits to defrag - Update involved pages to be dirty Signed-off-by:
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Qu Wenruo authored
Introduce a helper, defrag_collect_targets(), to collect all possible targets to be defragged. This function will not consider things like max_sectors_to_defrag, thus caller should be responsible to ensure we don't exceed the limit. This function will be the first stage of later defrag rework. Signed-off-by:
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Qu Wenruo authored
In cluster_pages_for_defrag(), we have complex code block inside one for() loop. The code block is to prepare one page for defrag, this will ensure: - The page is locked and set up properly. - No ordered extent exists in the page range. - The page is uptodate. This behavior is pretty common and will be reused by later defrag rework. So factor out the code into its own helper, defrag_prepare_one_page(), for later usage, and cleanup the code by a little. Signed-off-by:
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