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authorJohn Garry <john.g.garry@oracle.com>2025-05-07 14:18:28 -0700
committerDarrick J. Wong <djwong@kernel.org>2025-05-07 14:25:31 -0700
commit0ea88ed47bb1912377975f310da10183e0f6c5bb (patch)
treea516fd549fdc41dd275b467e1862d267af8d5e70
parent514df14fae97c91521ef53faf3a386e26afb8bee (diff)
xfs: refine atomic write size check in xfs_file_write_iter()
Currently the size of atomic write allowed is fixed at the blocksize. To start to lift this restriction, partly refactor xfs_report_atomic_write() to into helpers - xfs_get_atomic_write_{min, max}() - and use those helpers to find the per-inode atomic write limits and check according to that. Also add xfs_get_atomic_write_max_opt() to return the optimal limit, and just return 0 since large atomics aren't supported yet. Reviewed-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: John Garry <john.g.garry@oracle.com>
-rw-r--r--fs/xfs/xfs_file.c12
-rw-r--r--fs/xfs/xfs_iops.c36
-rw-r--r--fs/xfs/xfs_iops.h3
3 files changed, 39 insertions, 12 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 55bdae44e42a..e8acd6ca8f27 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1032,14 +1032,12 @@ xfs_file_write_iter(
return xfs_file_dax_write(iocb, from);
if (iocb->ki_flags & IOCB_ATOMIC) {
- /*
- * Currently only atomic writing of a single FS block is
- * supported. It would be possible to atomic write smaller than
- * a FS block, but there is no requirement to support this.
- * Note that iomap also does not support this yet.
- */
- if (ocount != ip->i_mount->m_sb.sb_blocksize)
+ if (ocount < xfs_get_atomic_write_min(ip))
return -EINVAL;
+
+ if (ocount > xfs_get_atomic_write_max(ip))
+ return -EINVAL;
+
ret = generic_atomic_write_valid(iocb, from);
if (ret)
return ret;
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 22432c300fd7..77a0606e9dc9 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -601,16 +601,42 @@ xfs_report_dioalign(
stat->dio_offset_align = stat->dio_read_offset_align;
}
+unsigned int
+xfs_get_atomic_write_min(
+ struct xfs_inode *ip)
+{
+ if (!xfs_inode_can_hw_atomic_write(ip))
+ return 0;
+
+ return ip->i_mount->m_sb.sb_blocksize;
+}
+
+unsigned int
+xfs_get_atomic_write_max(
+ struct xfs_inode *ip)
+{
+ if (!xfs_inode_can_hw_atomic_write(ip))
+ return 0;
+
+ return ip->i_mount->m_sb.sb_blocksize;
+}
+
+unsigned int
+xfs_get_atomic_write_max_opt(
+ struct xfs_inode *ip)
+{
+ return 0;
+}
+
static void
xfs_report_atomic_write(
struct xfs_inode *ip,
struct kstat *stat)
{
- unsigned int unit_min = 0, unit_max = 0;
-
- if (xfs_inode_can_hw_atomic_write(ip))
- unit_min = unit_max = ip->i_mount->m_sb.sb_blocksize;
- generic_fill_statx_atomic_writes(stat, unit_min, unit_max, 0);
+ generic_fill_statx_atomic_writes(stat,
+ xfs_get_atomic_write_min(ip),
+ xfs_get_atomic_write_max(ip),
+ xfs_get_atomic_write_max_opt(ip));
}
STATIC int
diff --git a/fs/xfs/xfs_iops.h b/fs/xfs/xfs_iops.h
index 3c1a2605ffd2..0896f6b8b3b8 100644
--- a/fs/xfs/xfs_iops.h
+++ b/fs/xfs/xfs_iops.h
@@ -19,5 +19,8 @@ int xfs_inode_init_security(struct inode *inode, struct inode *dir,
extern void xfs_setup_inode(struct xfs_inode *ip);
extern void xfs_setup_iops(struct xfs_inode *ip);
extern void xfs_diflags_to_iflags(struct xfs_inode *ip, bool init);
+unsigned int xfs_get_atomic_write_min(struct xfs_inode *ip);
+unsigned int xfs_get_atomic_write_max(struct xfs_inode *ip);
+unsigned int xfs_get_atomic_write_max_opt(struct xfs_inode *ip);
#endif /* __XFS_IOPS_H__ */