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authorAmir Goldstein <amir73il@gmail.com>2021-03-22 19:39:43 +0200
committerJan Kara <jack@suse.cz>2021-04-19 16:03:15 +0200
commit9591c3a34f7722bd77f42c98d76fd5a5bad465f0 (patch)
tree44001867b11da3de1fa029e50ab636ea381c0c7a /fs/ext4/super.c
parent22d483b99863202e3631ff66fa0f3c2302c0f96f (diff)
downloadlinux-9591c3a34f7722bd77f42c98d76fd5a5bad465f0.tar.bz2
fs: introduce a wrapper uuid_to_fsid()
Some filesystem's use a digest of their uuid for f_fsid. Create a simple wrapper for this open coded folding. Filesystems that have a non null uuid but use the block device number for f_fsid may also consider using this helper. [JK: Added missing asm/byteorder.h include] Link: https://lore.kernel.org/r/20210322173944.449469-2-amir73il@gmail.com Acked-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext4/super.c')
-rw-r--r--fs/ext4/super.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ad34a37278cd..3581c1cdc19e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -6148,7 +6148,6 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_super_block *es = sbi->s_es;
ext4_fsblk_t overhead = 0, resv_blocks;
- u64 fsid;
s64 bfree;
resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
@@ -6169,9 +6168,7 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
buf->f_files = le32_to_cpu(es->s_inodes_count);
buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
buf->f_namelen = EXT4_NAME_LEN;
- fsid = le64_to_cpup((void *)es->s_uuid) ^
- le64_to_cpup((void *)es->s_uuid + sizeof(u64));
- buf->f_fsid = u64_to_fsid(fsid);
+ buf->f_fsid = uuid_to_fsid(es->s_uuid);
#ifdef CONFIG_QUOTA
if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&