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btrfs: add filesystem generation to FS_INFO ioctl 

Add retrieval of the filesystem's generation to the fsinfo ioctl. This is
driven by setting the BTRFS_FS_INFO_FLAG_GENERATION flag in
btrfs_ioctl_fs_info_args::flags.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2020-07-13 21:28:59 +09:00 committed by David Sterba
parent 137c541821
commit 0fb408a558
2 changed files with 10 additions and 1 deletions
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5
fs/btrfs/ioctl.c
View File

@ -3247,6 +3247,11 @@ static long btrfs_ioctl_fs_info(struct btrfs_fs_info *fs_info,
fi_args->flags |= BTRFS_FS_INFO_FLAG_CSUM_INFO;
}
if (flags_in & BTRFS_FS_INFO_FLAG_GENERATION) {
fi_args->generation = fs_info->generation;
fi_args->flags |= BTRFS_FS_INFO_FLAG_GENERATION;
}
if (copy_to_user(arg, fi_args, sizeof(*fi_args)))
ret = -EFAULT;

6
include/uapi/linux/btrfs.h
View File

@ -250,6 +250,9 @@ struct btrfs_ioctl_dev_info_args {
/* Request information about checksum type and size */
#define BTRFS_FS_INFO_FLAG_CSUM_INFO (1 << 0)
/* Request information about filesystem generation */
#define BTRFS_FS_INFO_FLAG_GENERATION (1 << 1)
struct btrfs_ioctl_fs_info_args {
__u64 max_id; /* out */
__u64 num_devices; /* out */
@ -261,7 +264,8 @@ struct btrfs_ioctl_fs_info_args {
__u16 csum_type; /* out */
__u16 csum_size; /* out */
__u64 flags; /* in/out */
__u8 reserved[968]; /* pad to 1k */
__u64 generation; /* out */
__u8 reserved[960]; /* pad to 1k */
};
/*