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      1 /*
      2  * FS_IOC_FIEMAP ioctl infrastructure.
      3  *
      4  * Some portions copyright (C) 2007 Cluster File Systems, Inc
      5  *
      6  * Authors: Mark Fasheh <mfasheh (at) suse.com>
      7  *          Kalpak Shah <kalpak.shah (at) sun.com>
      8  *          Andreas Dilger <adilger (at) sun.com>
      9  */
     10 
     11 #ifndef _LINUX_FIEMAP_H
     12 #define _LINUX_FIEMAP_H
     13 
     14 struct fiemap_extent {
     15 	__u64 fe_logical;  /* logical offset in bytes for the start of
     16 			    * the extent from the beginning of the file */
     17 	__u64 fe_physical; /* physical offset in bytes for the start
     18 			    * of the extent from the beginning of the disk */
     19 	__u64 fe_length;   /* length in bytes for this extent */
     20 	__u64 fe_reserved64[2];
     21 	__u32 fe_flags;    /* FIEMAP_EXTENT_* flags for this extent */
     22 	__u32 fe_reserved[3];
     23 };
     24 
     25 struct fiemap {
     26 	__u64 fm_start;		/* logical offset (inclusive) at
     27 				 * which to start mapping (in) */
     28 	__u64 fm_length;	/* logical length of mapping which
     29 				 * userspace wants (in) */
     30 	__u32 fm_flags;		/* FIEMAP_FLAG_* flags for request (in/out) */
     31 	__u32 fm_mapped_extents;/* number of extents that were mapped (out) */
     32 	__u32 fm_extent_count;  /* size of fm_extents array (in) */
     33 	__u32 fm_reserved;
     34 	struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
     35 };
     36 
     37 #ifndef FS_IOC_FIEMAP
     38 #define FS_IOC_FIEMAP	_IOWR('f', 11, struct fiemap)
     39 #endif
     40 
     41 #define FIEMAP_MAX_OFFSET	(~0ULL)
     42 
     43 #define FIEMAP_FLAG_SYNC	0x00000001 /* sync file data before map */
     44 #define FIEMAP_FLAG_XATTR	0x00000002 /* map extended attribute tree */
     45 
     46 #define FIEMAP_FLAGS_COMPAT	(FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
     47 
     48 #define FIEMAP_EXTENT_LAST		0x00000001 /* Last extent in file. */
     49 #define FIEMAP_EXTENT_UNKNOWN		0x00000002 /* Data location unknown. */
     50 #define FIEMAP_EXTENT_DELALLOC		0x00000004 /* Location still pending.
     51 						    * Sets EXTENT_UNKNOWN. */
     52 #define FIEMAP_EXTENT_ENCODED		0x00000008 /* Data can not be read
     53 						    * while fs is unmounted */
     54 #define FIEMAP_EXTENT_DATA_ENCRYPTED	0x00000080 /* Data is encrypted by fs.
     55 						    * Sets EXTENT_NO_BYPASS. */
     56 #define FIEMAP_EXTENT_NOT_ALIGNED	0x00000100 /* Extent offsets may not be
     57 						    * block aligned. */
     58 #define FIEMAP_EXTENT_DATA_INLINE	0x00000200 /* Data mixed with metadata.
     59 						    * Sets EXTENT_NOT_ALIGNED.*/
     60 #define FIEMAP_EXTENT_DATA_TAIL		0x00000400 /* Multiple files in block.
     61 						    * Sets EXTENT_NOT_ALIGNED.*/
     62 #define FIEMAP_EXTENT_UNWRITTEN		0x00000800 /* Space allocated, but
     63 						    * no data (i.e. zero). */
     64 #define FIEMAP_EXTENT_MERGED		0x00001000 /* File does not natively
     65 						    * support extents. Result
     66 						    * merged for efficiency. */
     67 
     68 #endif /* _LINUX_FIEMAP_H */
     69