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btrfs: added helper functions to iterate backrefs

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These helper functions iterate back references and call a function for each
backref. There is also a function to resolve an inode to a path in the
file system.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt
2011-06-13 19:52:59 +02:00
parent 0a7a0519d1
commit a542ad1baf
4 changed files with 851 additions and 1 deletions
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11
fs/btrfs/ioctl.h
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@ -193,6 +193,17 @@ struct btrfs_ioctl_space_args {
struct btrfs_ioctl_space_info spaces[0];
};
struct btrfs_data_container {
__u32 bytes_left; /* out -- bytes not needed to deliver output */
__u32 bytes_missing; /* out -- additional bytes needed for result */
__u32 elem_cnt; /* out */
__u32 elem_missed; /* out */
union {
char *str[0]; /* out */
__u64 val[0]; /* out */
};
};
#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
struct btrfs_ioctl_vol_args)
#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \