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Commit e89c0413 authored by Darrick J. Wong's avatar Darrick J. Wong
Browse files

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: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
parent fb3c3de2

fs/xfs/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -79,6 +79,7 @@ xfs-y += xfs_aops.o \ 
				   xfs_extent_busy.o \

				   xfs_file.o \

				   xfs_filestream.o \

				   xfs_fsmap.o \

				   xfs_fsops.o \

				   xfs_globals.o \

				   xfs_icache.o \

fs/xfs/libxfs/xfs_fs.h

+13 −0
Original line number Diff line number Diff line
@@ -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

fs/xfs/libxfs/xfs_rmap.c

+28 −0
Original line number Diff line number Diff line
@@ -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;

}

fs/xfs/libxfs/xfs_rmap.h

+2 −0
Original line number Diff line number Diff line
@@ -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__ */

fs/xfs/xfs_fsmap.c

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+756 −0

File added.

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