From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
In commit fe341eb151ec, I forgot that xfs_free_file_space isn't strictly
a "remove mapped blocks" function. It is actually a function to zero
file space by punching out the middle and writing zeroes to the
unaligned ends of the specified range. Therefore, putting a rtextsize
alignment check in that function is wrong because that breaks unaligned
ZERO_RANGE on the realtime volume.
Furthermore, xfs_file_fallocate already has alignment checks for the
functions require the file range to be aligned to the size of a
fundamental allocation unit (which is 1 FSB on the data volume and 1 rt
extent on the realtime volume). Create a new helper to check fallocate
arguments against the realtiem allocation unit size, fix the fallocate
frontend to use it, fix free_file_space to delete the correct range, and
remove a now redundant check from insert_file_space.
NOTE: The realtime extent size is not required to be a power of two!
Fixes: fe341eb151ec ("xfs: ensure that fpunch, fcollapse, and finsert operations are aligned to rt extent size")
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
v2: fix this to actually handle rtextsize not being a power of 2, add
testcase
---
fs/xfs/xfs_bmap_util.c | 17 ++++-------------
fs/xfs/xfs_file.c | 40 +++++++++++++++++++++++++++++++++++-----
2 files changed, 39 insertions(+), 18 deletions(-)
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index f2a8a0e75e1f..52cddcfee8a1 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -947,11 +947,10 @@ xfs_free_file_space(
endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
/* We can only free complete realtime extents. */
- if (XFS_IS_REALTIME_INODE(ip)) {
- xfs_extlen_t extsz = xfs_get_extsz_hint(ip);
-
- if ((startoffset_fsb | endoffset_fsb) & (extsz - 1))
- return -EINVAL;
+ if (XFS_IS_REALTIME_INODE(ip) && mp->m_sb.sb_rextsize > 0) {
+ startoffset_fsb = round_up(startoffset_fsb,
+ mp->m_sb.sb_rextsize);
+ endoffset_fsb = round_down(endoffset_fsb, mp->m_sb.sb_rextsize);
}
/*
@@ -1147,14 +1146,6 @@ xfs_insert_file_space(
trace_xfs_insert_file_space(ip);
- /* We can only insert complete realtime extents. */
- if (XFS_IS_REALTIME_INODE(ip)) {
- xfs_extlen_t extsz = xfs_get_extsz_hint(ip);
-
- if ((stop_fsb | shift_fsb) & (extsz - 1))
- return -EINVAL;
- }
-
error = xfs_bmap_can_insert_extents(ip, stop_fsb, shift_fsb);
if (error)
return error;
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 3d1b95124744..9e97815887c5 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -785,6 +785,39 @@ xfs_break_layouts(
return error;
}
+/*
+ * Decide if the given file range is aligned to the size of the fundamental
+ * allocation unit for the file.
+ */
+static bool
+xfs_is_falloc_aligned(
+ struct xfs_inode *ip,
+ loff_t pos,
+ long long int len)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ uint64_t mask;
+
+ if (XFS_IS_REALTIME_INODE(ip)) {
+ if (!is_power_of_2(mp->m_sb.sb_rextsize)) {
+ u64 rextbytes;
+ u32 mod;
+
+ rextbytes = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize);
+ div_u64_rem(pos, rextbytes, &mod);
+ if (mod)
+ return false;
+ div_u64_rem(len, rextbytes, &mod);
+ return mod == 0;
+ }
+ mask = XFS_FSB_TO_B(mp, mp->m_sb.sb_rextsize) - 1;
+ } else {
+ mask = mp->m_sb.sb_blocksize - 1;
+ }
+
+ return !((pos | len) & mask);
+}
+
#define XFS_FALLOC_FL_SUPPORTED \
(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \
FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | \
@@ -850,9 +883,7 @@ xfs_file_fallocate(
if (error)
goto out_unlock;
} else if (mode & FALLOC_FL_COLLAPSE_RANGE) {
- unsigned int blksize_mask = i_blocksize(inode) - 1;
-
- if (offset & blksize_mask || len & blksize_mask) {
+ if (!xfs_is_falloc_aligned(ip, offset, len)) {
error = -EINVAL;
goto out_unlock;
}
@@ -872,10 +903,9 @@ xfs_file_fallocate(
if (error)
goto out_unlock;
} else if (mode & FALLOC_FL_INSERT_RANGE) {
- unsigned int blksize_mask = i_blocksize(inode) - 1;
loff_t isize = i_size_read(inode);
- if (offset & blksize_mask || len & blksize_mask) {
+ if (!xfs_is_falloc_aligned(ip, offset, len)) {
error = -EINVAL;
goto out_unlock;
}
