This is a note to let you know that I've just added the patch titled
xfs: create a new helper to return a file's allocation unit
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xfs-create-a-new-helper-to-return-a-file-s-allocatio.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6c6221ad1c3fcb4d6040d5a54bb8d2ce1aed2b5f
Author: Darrick J. Wong <djwong@xxxxxxxxxx>
Date: Wed Dec 18 11:17:13 2024 -0800
xfs: create a new helper to return a file's allocation unit
commit ee20808d848c87a51e176706d81b95a21747d6cf upstream.
[backport: dependency of d3b689d and f23660f]
Create a new helper function to calculate the fundamental allocation
unit (i.e. the smallest unit of space we can allocate) of a file.
Things are going to get hairy with range-exchange on the realtime
device, so prepare for this now.
Remove the static attribute from xfs_is_falloc_aligned since the next
patch will need it.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Catherine Hoang <catherine.hoang@xxxxxxxxxx>
Acked-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 8dcbcf965b2c..3b9d43d5c746 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -39,33 +39,25 @@ 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
+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;
+ unsigned int alloc_unit = xfs_inode_alloc_unitsize(ip);
+
+ if (!is_power_of_2(alloc_unit)) {
+ u32 mod;
+
+ div_u64_rem(pos, alloc_unit, &mod);
+ if (mod)
+ return false;
+ div_u64_rem(len, alloc_unit, &mod);
+ return mod == 0;
}
- return !((pos | len) & mask);
+ return !((pos | len) & (alloc_unit - 1));
}
/*
diff --git a/fs/xfs/xfs_file.h b/fs/xfs/xfs_file.h
index 7d39e3eca56d..2ad91f755caf 100644
--- a/fs/xfs/xfs_file.h
+++ b/fs/xfs/xfs_file.h
@@ -9,4 +9,7 @@
extern const struct file_operations xfs_file_operations;
extern const struct file_operations xfs_dir_file_operations;
+bool xfs_is_falloc_aligned(struct xfs_inode *ip, loff_t pos,
+ long long int len);
+
#endif /* __XFS_FILE_H__ */
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 1e50cc9a29db..6f7dca1c14c7 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -3782,3 +3782,16 @@ xfs_inode_reload_unlinked(
return error;
}
+
+/* Returns the size of fundamental allocation unit for a file, in bytes. */
+unsigned int
+xfs_inode_alloc_unitsize(
+ struct xfs_inode *ip)
+{
+ unsigned int blocks = 1;
+
+ if (XFS_IS_REALTIME_INODE(ip))
+ blocks = ip->i_mount->m_sb.sb_rextsize;
+
+ return XFS_FSB_TO_B(ip->i_mount, blocks);
+}
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 3beb470f1892..0f2999b84e7d 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -622,4 +622,6 @@ xfs_inode_unlinked_incomplete(
int xfs_inode_reload_unlinked_bucket(struct xfs_trans *tp, struct xfs_inode *ip);
int xfs_inode_reload_unlinked(struct xfs_inode *ip);
+unsigned int xfs_inode_alloc_unitsize(struct xfs_inode *ip);
+
#endif /* __XFS_INODE_H__ */
