@@ -853,14 +853,12 @@ 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)
+ unsigned int unit_min, unit_max;
+
+ xfs_get_atomic_write_attr(ip, &unit_min, &unit_max);
+ if (ocount < unit_min || ocount > unit_max)
return -EINVAL;
+
ret = generic_atomic_write_valid(iocb, from);
if (ret)
return ret;
@@ -600,15 +600,29 @@ xfs_report_dioalign(
stat->dio_offset_align = stat->dio_read_offset_align;
}
+void
+xfs_get_atomic_write_attr(
+ struct xfs_inode *ip,
+ unsigned int *unit_min,
+ unsigned int *unit_max)
+{
+ if (!xfs_inode_can_atomicwrite(ip)) {
+ *unit_min = *unit_max = 0;
+ return;
+ }
+
+ *unit_min = *unit_max = ip->i_mount->m_sb.sb_blocksize;
+}
+
static void
xfs_report_atomic_write(
struct xfs_inode *ip,
struct kstat *stat)
{
- unsigned int unit_min = 0, unit_max = 0;
+ unsigned int unit_min, unit_max;
+
+ xfs_get_atomic_write_attr(ip, &unit_min, &unit_max);
- if (xfs_inode_can_atomicwrite(ip))
- unit_min = unit_max = ip->i_mount->m_sb.sb_blocksize;
generic_fill_statx_atomic_writes(stat, unit_min, unit_max);
}
@@ -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);
+void xfs_get_atomic_write_attr(struct xfs_inode *ip,
+ unsigned int *unit_min, unsigned int *unit_max);
+
#endif /* __XFS_IOPS_H__ */
Currently the size of atomic write allowed is fixed at the blocksize. To start to lift this restriction, refactor xfs_get_atomic_write_attr() to into a helper - xfs_report_atomic_write() - and use that helper to find the per-inode atomic write limits and check according to that. Signed-off-by: John Garry <john.g.garry@oracle.com> --- fs/xfs/xfs_file.c | 12 +++++------- fs/xfs/xfs_iops.c | 20 +++++++++++++++++--- fs/xfs/xfs_iops.h | 3 +++ 3 files changed, 25 insertions(+), 10 deletions(-)