From: "Darrick J. Wong" Subject: [PATCH 2/3] xfs: introduce the XFS_IOC_GETFSMAPX ioctl Date: Thu, 5 May 2016 12:51:49 -0700 Message-ID: <20160505195149.GB2905@birch.djwong.org> References: <20160505194754.GA2785@birch.djwong.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-fsdevel , linux-api@vger.kernel.org, linux-ext4 , linux-btrfs , xfs To: Mark Fasheh , Josef Bacik , Dave Chinner , "Theodore Ts'o" , Ross Zwisler , Dan Williams Return-path: Content-Disposition: inline In-Reply-To: <20160505194754.GA2785@birch.djwong.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com List-Id: linux-ext4.vger.kernel.org Introduce a new ioctl that uses the reverse mapping btree to return information about the physical layout of the filesystem. This is the xfsprogs side of things for userspace support. Signed-off-by: Darrick J. Wong --- libxfs/xfs_fs.h | 65 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 106 insertions(+), 14 deletions(-) diff --git a/libxfs/xfs_fs.h b/libxfs/xfs_fs.h index d5ed090..6573fcc 100644 --- a/libxfs/xfs_fs.h +++ b/libxfs/xfs_fs.h @@ -117,6 +117,70 @@ struct getbmapx { #define BMV_OF_SHARED 0x8 /* segment shared with another file */ /* + * Structure for XFS_IOC_GETFSMAPX. + * + * Similar to XFS_IOC_GETBMAPX, the first two elements in the array are + * used to constrain the output. The first element in the array should + * represent the lowest disk address that the user wants to learn about. + * The second element in the array should represent the highest disk + * address to query. Subsequent array elements will be filled out by the + * command. + * + * The fmv_iflags field is only used in the first structure. The + * fmv_oflags field is filled in for each returned structure after the + * second structure. The fmv_unused1 fields in the first two array + * elements must be zero. + * + * The fmv_count, fmv_entries, and fmv_iflags fields in the second array + * element must be zero. + * + * fmv_block, fmv_offset, and fmv_length are expressed in units of 512 + * byte sectors. + */ +#ifndef HAVE_GETFSMAPX +struct getfsmapx { + __s64 fmv_device; /* device id */ + __s64 fmv_block; /* starting block */ + __s64 fmv_owner; /* owner id */ + __s64 fmv_offset; /* file offset of segment */ + __s64 fmv_length; /* length of segment, blocks */ + __s32 fmv_oflags; /* mapping flags */ + __s32 fmv_iflags; /* control flags (1st structure) */ + __s32 fmv_count; /* # of entries in array incl. input */ + __s32 fmv_entries; /* # of entries filled in (output). */ + __s64 fmv_unused1; /* future use, must be zero */ +}; +#endif + +/* fmv_device values - set by XFS_IOC_GETFSMAPX caller. */ +/* use this value if the filesystem doesn't support multiple devices. */ +#define FMV_DEV_DEFAULT 0 + +/* fmv_flags values - set by XFS_IOC_GETFSMAPX caller. */ +/* no flags defined yet */ +#define FMV_IF_VALID 0 + +/* fmv_flags values - returned for each non-header segment */ +#define FMV_OF_PREALLOC 0x1 /* segment = unwritten pre-allocation */ +#define FMV_OF_ATTR_FORK 0x2 /* segment = attribute fork */ +#define FMV_OF_EXTENT_MAP 0x4 /* segment = extent map */ +#define FMV_OF_SHARED 0x8 /* segment = shared with another file */ +#define FMV_OF_SPECIAL_OWNER 0x10 /* owner is a special value */ +#define FMV_OF_LAST 0x20 /* segment is the last in the FS */ + +/* fmv_owner special values */ +#define FMV_OWN_FREE (-1ULL) /* free space */ +#define FMV_OWN_UNKNOWN (-2ULL) /* unknown owner */ +#define FMV_OWN_FS (-3ULL) /* static fs metadata */ +#define FMV_OWN_LOG (-4ULL) /* journalling log */ +#define FMV_OWN_AG (-5ULL) /* per-AG metadata */ +#define FMV_OWN_INOBT (-6ULL) /* inode btree blocks */ +#define FMV_OWN_INODES (-7ULL) /* inodes */ +#define FMV_OWN_REFC (-8ULL) /* refcount tree */ +#define FMV_OWN_COW (-9ULL) /* cow allocations */ +#define FMV_OWN_DEFECTIVE (-10ULL) /* bad blocks */ + +/* * Structure for XFS_IOC_FSSETDM. * For use by backup and restore programs to set the XFS on-disk inode * fields di_dmevmask and di_dmstate. These must be set to exactly and @@ -523,6 +587,7 @@ 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) +#define XFS_IOC_GETFSMAPX _IOWR('X', 59, struct getfsmapx) /* * ioctl commands that replace IRIX syssgi()'s _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs