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statx: stx_subvol

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Add a new statx field for (sub)volume identifiers, as implemented by
btrfs and bcachefs.

This includes bcachefs support; we'll definitely want btrfs support as
well.

Link: https://lore.kernel.org/linux-fsdevel/2uvhm6gweyl7iyyp2xpfryvcu2g3padagaeqcbiavjyiis6prl@yjm725bizncq/
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Josef Bacik <josef@toxicpanda.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Link: https://lore.kernel.org/r/20240308022914.196982-1-kent.overstreet@linux.dev
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Kent Overstreet 2024-03-07 21:29:12 -05:00 committed by Christian Brauner
parent 4cece76496
commit 2a82bb0294
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
5 changed files with 11 additions and 1 deletions
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3
fs/bcachefs/fs.c
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@ -841,6 +841,9 @@ static int bch2_getattr(struct mnt_idmap *idmap,
stat->blksize = block_bytes(c);
stat->blocks = inode->v.i_blocks;
stat->subvol = inode->ei_subvol;
stat->result_mask |= STATX_SUBVOL;
if (request_mask & STATX_BTIME) {
stat->result_mask |= STATX_BTIME;
stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime);

3
fs/btrfs/inode.c
View File

@ -8779,6 +8779,9 @@ static int btrfs_getattr(struct mnt_idmap *idmap,
generic_fillattr(idmap, request_mask, inode, stat);
stat->dev = BTRFS_I(inode)->root->anon_dev;
stat->subvol = BTRFS_I(inode)->root->root_key.objectid;
stat->result_mask |= STATX_SUBVOL;
spin_lock(&BTRFS_I(inode)->lock);
delalloc_bytes = BTRFS_I(inode)->new_delalloc_bytes;
inode_bytes = inode_get_bytes(inode);

1
fs/stat.c
View File

@ -658,6 +658,7 @@ cp_statx(const struct kstat *stat, struct statx __user *buffer)
tmp.stx_mnt_id = stat->mnt_id;
tmp.stx_dio_mem_align = stat->dio_mem_align;
tmp.stx_dio_offset_align = stat->dio_offset_align;
tmp.stx_subvol = stat->subvol;
return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}

1
include/linux/stat.h
View File

@ -53,6 +53,7 @@ struct kstat {
u32 dio_mem_align;
u32 dio_offset_align;
u64 change_cookie;
u64 subvol;
};
/* These definitions are internal to the kernel for now. Mainly used by nfsd. */

4
include/uapi/linux/stat.h
View File

@ -126,8 +126,9 @@ struct statx {
__u64 stx_mnt_id;
__u32 stx_dio_mem_align; /* Memory buffer alignment for direct I/O */
__u32 stx_dio_offset_align; /* File offset alignment for direct I/O */
__u64 stx_subvol; /* Subvolume identifier */
/* 0xa0 */
__u64 __spare3[12]; /* Spare space for future expansion */
__u64 __spare3[11]; /* Spare space for future expansion */
/* 0x100 */
};
@ -155,6 +156,7 @@ struct statx {
#define STATX_MNT_ID 0x00001000U /* Got stx_mnt_id */
#define STATX_DIOALIGN 0x00002000U /* Want/got direct I/O alignment info */
#define STATX_MNT_ID_UNIQUE 0x00004000U /* Want/got extended stx_mount_id */
#define STATX_SUBVOL 0x00008000U /* Want/got stx_subvol */
#define STATX__RESERVED 0x80000000U /* Reserved for future struct statx expansion */