diff options
| author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-03-29 00:56:37 +0300 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-04-04 01:18:17 +0300 |
| commit | e89c041338ed6ef2694e6465ca1ba033e0a2978c (patch) | |
| tree | 7866a101041335d77127b2258e5759b61d1d1e60 /fs/xfs/libxfs | |
| parent | fb3c3de2f65c007f3ee50538ea131f5c4603c7bc (diff) | |
| download | linux-e89c041338ed6ef2694e6465ca1ba033e0a2978c.tar.xz | |
xfs: implement the GETFSMAP ioctl
Introduce a new ioctl that uses the reverse mapping btree to return
information about the physical layout of the filesystem.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Diffstat (limited to 'fs/xfs/libxfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_fs.h | 13 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_rmap.c | 28 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_rmap.h | 2 |
3 files changed, 43 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h index b72dc821d78b..095bdf049a3f 100644 --- a/fs/xfs/libxfs/xfs_fs.h +++ b/fs/xfs/libxfs/xfs_fs.h @@ -92,6 +92,18 @@ struct getbmapx { #define BMV_OF_LAST 0x4 /* segment is the last in the file */ #define BMV_OF_SHARED 0x8 /* segment shared with another file */ +/* fmr_owner special values for FS_IOC_GETFSMAP */ +#define XFS_FMR_OWN_FREE FMR_OWN_FREE /* free space */ +#define XFS_FMR_OWN_UNKNOWN FMR_OWN_UNKNOWN /* unknown owner */ +#define XFS_FMR_OWN_FS FMR_OWNER('X', 1) /* static fs metadata */ +#define XFS_FMR_OWN_LOG FMR_OWNER('X', 2) /* journalling log */ +#define XFS_FMR_OWN_AG FMR_OWNER('X', 3) /* per-AG metadata */ +#define XFS_FMR_OWN_INOBT FMR_OWNER('X', 4) /* inode btree blocks */ +#define XFS_FMR_OWN_INODES FMR_OWNER('X', 5) /* inodes */ +#define XFS_FMR_OWN_REFC FMR_OWNER('X', 6) /* refcount tree */ +#define XFS_FMR_OWN_COW FMR_OWNER('X', 7) /* cow staging */ +#define XFS_FMR_OWN_DEFECTIVE FMR_OWNER('X', 8) /* bad blocks */ + /* * Structure for XFS_IOC_FSSETDM. * For use by backup and restore programs to set the XFS on-disk inode @@ -502,6 +514,7 @@ typedef struct xfs_swapext #define XFS_IOC_GETBMAPX _IOWR('X', 56, struct getbmap) #define XFS_IOC_ZERO_RANGE _IOW ('X', 57, struct xfs_flock64) #define XFS_IOC_FREE_EOFBLOCKS _IOR ('X', 58, struct xfs_fs_eofblocks) +/* XFS_IOC_GETFSMAP ------ hoisted 59 */ /* * ioctl commands that replace IRIX syssgi()'s diff --git a/fs/xfs/libxfs/xfs_rmap.c b/fs/xfs/libxfs/xfs_rmap.c index 384055668374..06cfb93c2ef9 100644 --- a/fs/xfs/libxfs/xfs_rmap.c +++ b/fs/xfs/libxfs/xfs_rmap.c @@ -2305,3 +2305,31 @@ xfs_rmap_free_extent( return __xfs_rmap_add(mp, dfops, XFS_RMAP_FREE, owner, XFS_DATA_FORK, &bmap); } + +/* Compare rmap records. Returns -1 if a < b, 1 if a > b, and 0 if equal. */ +int +xfs_rmap_compare( + const struct xfs_rmap_irec *a, + const struct xfs_rmap_irec *b) +{ + __u64 oa; + __u64 ob; + + oa = xfs_rmap_irec_offset_pack(a); + ob = xfs_rmap_irec_offset_pack(b); + + if (a->rm_startblock < b->rm_startblock) + return -1; + else if (a->rm_startblock > b->rm_startblock) + return 1; + else if (a->rm_owner < b->rm_owner) + return -1; + else if (a->rm_owner > b->rm_owner) + return 1; + else if (oa < ob) + return -1; + else if (oa > ob) + return 1; + else + return 0; +} diff --git a/fs/xfs/libxfs/xfs_rmap.h b/fs/xfs/libxfs/xfs_rmap.h index faf2c1a2e63b..98f908fea103 100644 --- a/fs/xfs/libxfs/xfs_rmap.h +++ b/fs/xfs/libxfs/xfs_rmap.h @@ -214,5 +214,7 @@ int xfs_rmap_find_left_neighbor(struct xfs_btree_cur *cur, xfs_agblock_t bno, int xfs_rmap_lookup_le_range(struct xfs_btree_cur *cur, xfs_agblock_t bno, uint64_t owner, uint64_t offset, unsigned int flags, struct xfs_rmap_irec *irec, int *stat); +int xfs_rmap_compare(const struct xfs_rmap_irec *a, + const struct xfs_rmap_irec *b); #endif /* __XFS_RMAP_H__ */ |