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btrfs: sysfs: fix direct super block member reads

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commit fca432e73d upstream.

The following sysfs entries are reading super block member directly,
which can have a different endian and cause wrong values:

- sys/fs/btrfs/<uuid>/nodesize
- sys/fs/btrfs/<uuid>/sectorsize
- sys/fs/btrfs/<uuid>/clone_alignment

Thankfully those values (nodesize and sectorsize) are always aligned
inside the btrfs_super_block, so it won't trigger unaligned read errors,
just endian problems.

Fix them by using the native cached members instead.

Fixes: df93589a17 ("btrfs: export more from FS_INFO to sysfs")
CC: stable@vger.kernel.org
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Qu Wenruo
2024-12-18 17:00:56 +10:30
committed by Greg Kroah-Hartman
parent 6e1a822593
commit 1ce3620658
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
fs/btrfs/sysfs.c
+3 -3
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@@ -1022,7 +1022,7 @@ static ssize_t btrfs_nodesize_show(struct kobject *kobj,
{
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
return sysfs_emit(buf, "%u\n", fs_info->super_copy->nodesize);
return sysfs_emit(buf, "%u\n", fs_info->nodesize);
}
BTRFS_ATTR(, nodesize, btrfs_nodesize_show);
@@ -1032,7 +1032,7 @@ static ssize_t btrfs_sectorsize_show(struct kobject *kobj,
{
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize);
return sysfs_emit(buf, "%u\n", fs_info->sectorsize);
}
BTRFS_ATTR(, sectorsize, btrfs_sectorsize_show);
@@ -1084,7 +1084,7 @@ static ssize_t btrfs_clone_alignment_show(struct kobject *kobj,
{
struct btrfs_fs_info *fs_info = to_fs_info(kobj);
return sysfs_emit(buf, "%u\n", fs_info->super_copy->sectorsize);
return sysfs_emit(buf, "%u\n", fs_info->sectorsize);
}
BTRFS_ATTR(, clone_alignment, btrfs_clone_alignment_show);