root/include/linux/fiemap.h

INCLUDED FROM

/*
 * FS_IOC_FIEMAP ioctl infrastructure.
 *
 * Some portions copyright (C) 2007 Cluster File Systems, Inc
 *
 * Authors: Mark Fasheh <mfasheh@suse.com>
 *          Kalpak Shah <kalpak.shah@sun.com>
 *          Andreas Dilger <adilger@sun.com>
 */

#ifndef _LINUX_FIEMAP_H
#define _LINUX_FIEMAP_H

struct fiemap_extent {
        __u64 fe_logical;  /* logical offset in bytes for the start of
                            * the extent from the beginning of the file */
        __u64 fe_physical; /* physical offset in bytes for the start
                            * of the extent from the beginning of the disk */
        __u64 fe_length;   /* length in bytes for this extent */
        __u64 fe_reserved64[2];
        __u32 fe_flags;    /* FIEMAP_EXTENT_* flags for this extent */
        __u32 fe_reserved[3];
};

struct fiemap {
        __u64 fm_start;         /* logical offset (inclusive) at
                                 * which to start mapping (in) */
        __u64 fm_length;        /* logical length of mapping which
                                 * userspace wants (in) */
        __u32 fm_flags;         /* FIEMAP_FLAG_* flags for request (in/out) */
        __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
        __u32 fm_extent_count;  /* size of fm_extents array (in) */
        __u32 fm_reserved;
        struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
};

#define FIEMAP_MAX_OFFSET       (~0ULL)

#define FIEMAP_FLAG_SYNC        0x00000001 /* sync file data before map */
#define FIEMAP_FLAG_XATTR       0x00000002 /* map extended attribute tree */

#define FIEMAP_FLAGS_COMPAT     (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)

#define FIEMAP_EXTENT_LAST              0x00000001 /* Last extent in file. */
#define FIEMAP_EXTENT_UNKNOWN           0x00000002 /* Data location unknown. */
#define FIEMAP_EXTENT_DELALLOC          0x00000004 /* Location still pending.
                                                    * Sets EXTENT_UNKNOWN. */
#define FIEMAP_EXTENT_ENCODED           0x00000008 /* Data can not be read
                                                    * while fs is unmounted */
#define FIEMAP_EXTENT_DATA_ENCRYPTED    0x00000080 /* Data is encrypted by fs.
                                                    * Sets EXTENT_NO_BYPASS. */
#define FIEMAP_EXTENT_NOT_ALIGNED       0x00000100 /* Extent offsets may not be
                                                    * block aligned. */
#define FIEMAP_EXTENT_DATA_INLINE       0x00000200 /* Data mixed with metadata.
                                                    * Sets EXTENT_NOT_ALIGNED.*/
#define FIEMAP_EXTENT_DATA_TAIL         0x00000400 /* Multiple files in block.
                                                    * Sets EXTENT_NOT_ALIGNED.*/
#define FIEMAP_EXTENT_UNWRITTEN         0x00000800 /* Space allocated, but
                                                    * no data (i.e. zero). */
#define FIEMAP_EXTENT_MERGED            0x00001000 /* File does not natively
                                                    * support extents. Result
                                                    * merged for efficiency. */

#endif /* _LINUX_FIEMAP_H */