fiemap.h

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/*
 * FS_IOC_FIEMAP ioctl infrastructure.
 *
 * Some portions copyright (C) 2007 Cluster File Systems, Inc
 *
 * Authors: Mark Fasheh <[email protected]>
 *          Kalpak Shah <[email protected]>
 *          Andreas Dilger <[email protected]>
 */

#ifndef _LINUX_FIEMAP_H
#define _LINUX_FIEMAP_H

#include <linux/types.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. */
#define FIEMAP_EXTENT_SHARED        0x00002000 /* Space shared with other
                            * files. */

#endif /* _LINUX_FIEMAP_H */