kernel/linux.git/fs/xfs/libxfs, branch master

xfs: switch (back) to a per-buftarg buffer hash

2026-03-30T14:34:05+00:00

The per-AG buffer hashes were added when all buffer lookups took a per-hash look. Since then we've made lookups entirely lockless and removed the need for a hash-wide lock for inserts and removals as well. With this there is no need to sharding the hash, so reduce the used resources by using a per-buftarg hash for all buftargs. Long after writing this initially, syzbot found a problem in the buffer cache teardown order, which this happens to fix as well by doing the entire buffer cache teardown in one places instead of splitting it between destroying the buftarg and the perag structures. Link: https://lore.kernel.org/linux-xfs/aLeUdemAZ5wmtZel@dread.disaster.area/ Reported-by: syzbot+0391d34e801643e2809b@syzkaller.appspotmail.com Reviewed-by: Darrick J. Wong Tested-by: syzbot+0391d34e801643e2809b@syzkaller.appspotmail.com Signed-off-by: Christoph Hellwig Reviewed-by: Brian Foster Signed-off-by: Carlos Maiolino

Merge branch 'xfs-7.0-fixes' into for-next

2026-03-23T10:10:52+00:00

Signed-off-by: Carlos Maiolino

xfs: factor out xfs_attr3_leaf_init

2026-03-23T09:47:28+00:00

Factor out wrapper xfs_attr3_leaf_init function, which exported for external use. Reviewed-by: Darrick J. Wong Signed-off-by: Long Li Signed-off-by: Carlos Maiolino

xfs: factor out xfs_attr3_node_entry_remove

2026-03-23T09:47:28+00:00

Factor out wrapper xfs_attr3_node_entry_remove function, which exported for external use. Reviewed-by: Darrick J. Wong Signed-off-by: Long Li Signed-off-by: Carlos Maiolino

Merge branch 'xfs-7.1-merge' into for-next

2026-03-18T10:04:17+00:00

Signed-off-by: Carlos Maiolino

xfs: annotate struct xfs_attr_list_context with __counted_by_ptr

2026-03-18T08:54:39+00:00

Add the `__counted_by_ptr` attribute to the `buffer` field of `struct xfs_attr_list_context`. This field is used to point to a buffer of size `bufsize`. The `buffer` field is assigned in: 1. `xfs_ioc_attr_list` in `fs/xfs/xfs_handle.c` 2. `xfs_xattr_list` in `fs/xfs/xfs_xattr.c` 3. `xfs_getparents` in `fs/xfs/xfs_handle.c` (implicitly initialized to NULL) In `xfs_ioc_attr_list`, `buffer` was assigned before `bufsize`. Reorder them to ensure `bufsize` is set before `buffer` is assigned, although no access happens between them. In `xfs_xattr_list`, `buffer` was assigned before `bufsize`. Reorder them to ensure `bufsize` is set before `buffer` is assigned. In `xfs_getparents`, `buffer` is NULL (from zero initialization) and remains NULL. `bufsize` is set to a non-zero value, but since `buffer` is NULL, no access occurs. In all cases, the pointer `buffer` is not accessed before `bufsize` is set. This patch was generated by CodeMender and reviewed by Bill Wendling. Tested by running xfstests. Signed-off-by: Bill Wendling Reviewed-by: Christoph Hellwig Reviewed-by: Darrick J. Wong Signed-off-by: Carlos Maiolino

xfs: fix returned valued from xfs_defer_can_append

2026-03-06T08:30:07+00:00

xfs_defer_can_append returns a bool, it shouldn't be returning a NULL. Found by code inspection. Fixes: 4dffb2cbb483 ("xfs: allow pausing of pending deferred work items") Cc: # v6.8 Signed-off-by: Carlos Maiolino Reviewed-by: Darrick J. Wong Acked-by: Souptick Joarder Signed-off-by: Carlos Maiolino

xfs: Remove redundant NULL check after __GFP_NOFAIL

2026-03-05T09:02:45+00:00

kzalloc() is called with __GFP_NOFAIL, so a NULL return is not expected. Drop the redundant !map check in xfs_dabuf_map(). Also switch the nirecs-sized allocation to kcalloc(). Signed-off-by: hongao Reviewed-by: Christoph Hellwig Signed-off-by: Carlos Maiolino

xfs: add write pointer to xfs_rtgroup_geometry

2026-03-04T08:58:24+00:00

There is currently no XFS ioctl that allows userspace to retrieve the write pointer for a specific realtime group block for zoned XFS. On zoned block devices, userspace can obtain this information via zone reports from the underlying device. However, for zoned XFS operating on regular block devices, no equivalent mechanism exists. Access to the realtime group write pointer is useful to userspace development and analysis tools such as Zonar [1]. So extend the existing struct xfs_rtgroup_geometry to add a new rg_writepointer field. This field is valid if XFS_RTGROUP_GEOM_WRITEPOINTER flag is set. The rg_writepointer field specifies the location of the current writepointer as a block offset into the respective rtgroup. [1] https://lwn.net/Articles/1059364/ Signed-off-by: Wilfred Mallawa Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig Signed-off-by: Carlos Maiolino

xfs: add static size checks for ioctl UABI

2026-02-25T12:58:50+00:00

The ioctl structures in libxfs/xfs_fs.h are missing static size checks. It is useful to have static size checks for these structures as adding new fields to them could cause issues (e.g. extra padding that may be inserted by the compiler). So add these checks to xfs/xfs_ondisk.h. Due to different padding/alignment requirements across different architectures, to avoid build failures, some structures are ommited from the size checks. For example, structures with "compat_" definitions in xfs/xfs_ioctl32.h are ommited. Signed-off-by: Wilfred Mallawa Reviewed-by: Christoph Hellwig Signed-off-by: Carlos Maiolino