[PATCH v4 03/22] xfs: Use extent size granularity for iomap->io_block_size

John Garry
2024-06-07T14:40:15Z

Currently iomap->io_block_size is set to the i_blocksize() value for the
inode.

Expand the sub-fs block size zeroing to now cover RT extents, by calling
setting iomap->io_block_size as xfs_inode_alloc_unitsize().

In xfs_iomap_write_unwritten(), update the unwritten range fsb to cover
this extent granularity.

In xfs_file_dio_write(), handle a write which is not aligned to extent
size granularity as unaligned. Since the extent size granularity need not
be a power-of-2, handle this also.

Signed-off-by: John Garry <john.g.garry@oracle.com>
---
fs/xfs/xfs_file.c | 24 +++++++++++++++++++-----
fs/xfs/xfs_inode.c | 17 +++++++++++------
fs/xfs/xfs_inode.h | 1 +
fs/xfs/xfs_iomap.c | 8 +++++++-
4 files changed, 38 insertions(+), 12 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index b240ea5241dc..24fe3c2e03da 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -601,7 +601,7 @@ xfs_file_dio_write_aligned(
}

/*
- * Handle block unaligned direct I/O writes
+ * Handle unaligned direct IO writes.
*
* In most cases direct I/O writes will be done holding IOLOCK_SHARED, allowing
* them to be done in parallel with reads and other direct I/O writes. However,
@@ -630,9 +630,9 @@ xfs_file_dio_write_unaligned(
ssize_t ret;

/*
- * Extending writes need exclusivity because of the sub-block zeroing
- * that the DIO code always does for partial tail blocks beyond EOF, so
- * don't even bother trying the fast path in this case.
+ * Extending writes need exclusivity because of the sub-block/extent
+ * zeroing that the DIO code always does for partial tail blocks
+ * beyond EOF, so don't even bother trying the fast path in this case.
*/
if (iocb->ki_pos > isize || iocb->ki_pos + count >= isize) {
if (iocb->ki_flags & IOCB_NOWAIT)
@@ -698,11 +698,25 @@ xfs_file_dio_write(
struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
struct xfs_buftarg *target = xfs_inode_buftarg(ip);
size_t count = iov_iter_count(from);
+ bool unaligned;
+ u64 unitsize;

/* direct I/O must be aligned to device logical sector size */
if ((iocb->ki_pos | count) & target->bt_logical_sectormask)
return -EINVAL;
- if ((iocb->ki_pos | count) & ip->i_mount->m_blockmask)
+
+ unitsize = xfs_inode_alloc_unitsize(ip);
+ if (!is_power_of_2(unitsize)) {
+ if (isaligned_64(iocb->ki_pos, unitsize) &&
+ isaligned_64(count, unitsize))
+ unaligned = false;
+ else
+ unaligned = true;
+ } else {
+ unaligned = (iocb->ki_pos | count) & (unitsize - 1);
+ }
+
+ if (unaligned)
return xfs_file_dio_write_unaligned(ip, iocb, from);
return xfs_file_dio_write_aligned(ip, iocb, from);
}
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 58fb7a5062e1..93ad442f399b 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -4264,15 +4264,20 @@ xfs_break_layouts(
return error;
}

-/* Returns the size of fundamental allocation unit for a file, in bytes. */
unsigned int
-xfs_inode_alloc_unitsize(
+xfs_inode_alloc_unitsize_fsb(
struct xfs_inode *ip)
{
- unsigned int blocks = 1;
-
if (XFS_IS_REALTIME_INODE(ip))
- blocks = ip->i_mount->m_sb.sb_rextsize;
+ return ip->i_mount->m_sb.sb_rextsize;
+
+ return 1;
+}

- return XFS_FSB_TO_B(ip->i_mount, blocks);
+/* Returns the size of fundamental allocation unit for a file, in bytes. */
+unsigned int
+xfs_inode_alloc_unitsize(
+ struct xfs_inode *ip)
+{
+ return XFS_FSB_TO_B(ip->i_mount, xfs_inode_alloc_unitsize_fsb(ip));
}
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 292b90b5f2ac..90d2fa837117 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -643,6 +643,7 @@ int xfs_inode_reload_unlinked(struct xfs_inode *ip);
bool xfs_ifork_zapped(const struct xfs_inode *ip, int whichfork);
void xfs_inode_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
xfs_filblks_t *dblocks, xfs_filblks_t *rblocks);
+unsigned int xfs_inode_alloc_unitsize_fsb(struct xfs_inode *ip);
unsigned int xfs_inode_alloc_unitsize(struct xfs_inode *ip);

struct xfs_dir_update_params {
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index ecb4cae88248..fbe69f747e30 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -127,7 +127,7 @@ xfs_bmbt_to_iomap(
}
iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
- iomap->io_block_size = i_blocksize(VFS_I(ip));
+ iomap->io_block_size = xfs_inode_alloc_unitsize(ip);
if (mapping_flags & IOMAP_DAX)
iomap->dax_dev = target->bt_daxdev;
else
@@ -577,11 +577,17 @@ xfs_iomap_write_unwritten(
xfs_fsize_t i_size;
uint resblks;
int error;
+ unsigned int rounding;

trace_xfs_unwritten_convert(ip, offset, count);

offset_fsb = XFS_B_TO_FSBT(mp, offset);
count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
+ rounding = xfs_inode_alloc_unitsize_fsb(ip);
+ if (rounding > 1) {
+ offset_fsb = rounddown_64(offset_fsb, rounding);
+ count_fsb = roundup_64(count_fsb, rounding);
+ }
count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);

/*
--
2.31.1