From 25219dbfa734e848fe4da84143f972d0301bb7c6 Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <darrick.wong@oracle.com>
Date: Fri, 9 Oct 2020 16:42:59 -0700
Subject: xfs: fix fallocate functions when rtextsize is larger than 1
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@oracle.com>
Reviewed-by: Chandan Babu R <chandanrlinux@gmail.com>
---
fs/xfs/xfs_bmap_util.c | 18 +++++-------------
fs/xfs/xfs_file.c | 40 +++++++++++++++++++++++++++++++++++-----
fs/xfs/xfs_linux.h | 6 ++++++
3 files changed, 46 insertions(+), 18 deletions(-)
(limited to 'fs')
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index f2a8a0e75e1f..7371a7f7c652 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -947,11 +947,11 @@ 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 > 1) {
+ startoffset_fsb = roundup_64(startoffset_fsb,
+ mp->m_sb.sb_rextsize);
+ endoffset_fsb = rounddown_64(endoffset_fsb,
+ mp->m_sb.sb_rextsize);
}
/*
@@ -1147,14 +1147,6 @@ 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..5b0f93f73837 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -32,6 +32,39 @@
static const struct vm_operations_struct xfs_file_vm_ops;
+/*
+ * 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);
+}
+
int
xfs_update_prealloc_flags(
struct xfs_inode *ip,
@@ -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;
}
diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index ad1009778d33..5b7a1e201559 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -175,6 +175,12 @@ static inline xfs_dev_t linux_to_xfs_dev_t(dev_t dev)
#define xfs_sort(a,n,s,fn) sort(a,n,s,fn,NULL)
#define xfs_stack_trace() dump_stack()
+static inline uint64_t rounddown_64(uint64_t x, uint32_t y)
+{
+ do_div(x, y);
+ return x * y;
+}
+
static inline uint64_t roundup_64(uint64_t x, uint32_t y)
{
x += y - 1;
--
cgit