kernel/git/stable/linux.git/fs/btrfs/qgroup.h, branch master

btrfs: unexport btrfs_qgroup_reserve_meta()

2026-04-07T16:56:05+00:00

There's only one caller outside qgroup.c of btrfs_qgroup_reserve_meta() and we have btrfs_qgroup_reserve_meta_prealloc() is a wrapper around that function. Make that caller use btrfs_qgroup_reserve_meta_prealloc() and unexport btrfs_qgroup_reserve_meta(), simplifying the external API. Reviewed-by: Qu Wenruo Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: collapse __btrfs_qgroup_reserve_meta() into btrfs_qgroup_reserve_meta_prealloc()

2026-04-07T16:56:04+00:00

Since __btrfs_qgroup_reserve_meta() is only called by btrfs_qgroup_reserve_meta_prealloc(), which is a simple inline wrapper, get rid of the later and rename __btrfs_qgroup_reserve_meta() to the later. Reviewed-by: Qu Wenruo Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: collapse __btrfs_qgroup_free_meta() into btrfs_qgroup_free_meta_prealloc()

2026-04-07T16:56:04+00:00

Since __btrfs_qgroup_free_meta() is only called by btrfs_qgroup_free_meta_prealloc(), which is a simple inline wrapper, get rid of the later and rename __btrfs_qgroup_free_meta() to the later. Reviewed-by: Qu Wenruo Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: remove unused qgroup functions for pertrans reservation and freeing

2026-04-07T16:56:04+00:00

They have no more users since commit a6496849671a ("btrfs: fix start transaction qgroup rsv double free"), so remove them. Reviewed-by: Qu Wenruo Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: update include and forward declarations in headers

2025-03-18T19:35:43+00:00

Pass over all header files and add missing forward declarations, includes or fix include types. Signed-off-by: David Sterba

btrfs: drop unused transaction parameter from btrfs_qgroup_add_swapped_blocks()

2024-11-11T13:34:16+00:00

The caller replace_path() runs under transaction but we don't need it in btrfs_qgroup_add_swapped_blocks(). Reviewed-by: Anand Jain Signed-off-by: David Sterba

btrfs: remove unused btrfs_free_squota_rsv()

2024-11-11T13:34:14+00:00

btrfs_free_squota_rsv() was added in commit e85a0adacf17 ("btrfs: ensure releasing squota reserve on head refs") but has remained unused since then. Remove it as we don't seem to need it and was probably a leftover. Reviewed-by: Qu Wenruo Signed-off-by: Dr. David Alan Gilbert Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: qgroups: remove bytenr field from struct btrfs_qgroup_extent_record

2024-11-11T13:34:13+00:00

Now that we track qgroup extent records in a xarray we don't need to have a "bytenr" field in struct btrfs_qgroup_extent_record, since we can get it from the index of the record in the xarray. So remove the field and grab the bytenr from either the index key or any other place where it's available (delayed refs). This reduces the size of struct btrfs_qgroup_extent_record from 40 bytes down to 32 bytes, meaning that we now can store 128 instances of this structure instead of 102 per 4K page. Reviewed-by: Qu Wenruo Signed-off-by: Filipe Manana Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: qgroup: set a more sane default value for subtree drop threshold

2024-10-22T14:09:11+00:00

Since commit 011b46c30476 ("btrfs: skip subtree scan if it's too high to avoid low stall in btrfs_commit_transaction()"), btrfs qgroup can automatically skip large subtree scan at the cost of marking qgroup inconsistent. It's designed to address the final performance problem of snapshot drop with qgroup enabled, but to be safe the default value is BTRFS_MAX_LEVEL, requiring a user space daemon to set a different value to make it work. I'd say it's not a good idea to rely on user space tool to set this default value, especially when some operations (snapshot dropping) can be triggered immediately after mount, leaving a very small window to that that sysfs interface. So instead of disabling this new feature by default, enable it with a low threshold (3), so that large subvolume tree drop at mount time won't cause huge qgroup workload. CC: stable@vger.kernel.org # 6.1 Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba

btrfs: qgroup: use xarray to track dirty extents in transaction

2024-09-10T14:51:18+00:00

Use xarray to track dirty extents to reduce the size of the struct btrfs_qgroup_extent_record from 64 bytes to 40 bytes. The xarray is more cache line friendly, it also reduces the complexity of insertion and search code compared to rb tree. Another change introduced is about error handling. Before this patch, the result of btrfs_qgroup_trace_extent_nolock() is always a success. In this patch, because of this function calls the function xa_store() which has the possibility to fail, so mark qgroup as inconsistent if error happened and then free preallocated memory. Also we preallocate memory before spin_lock(), if memory preallcation failed, error handling is the same the existing code. Suggested-by: Qu Wenruo Signed-off-by: Junchao Sun Signed-off-by: David Sterba