ldiskfs/kernel_patches/patches/ext3-fiemap-2.6-sles10.patch

   1 A large part of this code is from the generic VFS code in fs/ioctl.c in the
   2 upstream kernel.
   3
   4 Index: linux-2.6.16.60-0.23/fs/ext3/ioctl.c
   5 ===================================================================
   6 --- linux-2.6.16.60-0.23.orig/fs/ext3/ioctl.c
   7 +++ linux-2.6.16.60-0.23/fs/ext3/ioctl.c
   8 @@ -15,7 +15,159 @@
   9  #include <linux/time.h>
  10  #include <asm/uaccess.h>
  11  #include <linux/namei.h>
  12 +#include "fiemap.h"
  13
  14 +/* So that the fiemap access checks can't overflow on 32 bit machines. */
  15 +#define FIEMAP_MAX_EXTENTS     (UINT_MAX / sizeof(struct fiemap_extent))
  16 +
  17 +/**
  18 + * fiemap_fill_next_extent - Fiemap helper function
  19 + * @fieinfo:   Fiemap context passed into ->fiemap
  20 + * @logical:   Extent logical start offset, in bytes
  21 + * @phys:      Extent physical start offset, in bytes
  22 + * @len:       Extent length, in bytes
  23 + * @flags:     FIEMAP_EXTENT flags that describe this extent
  24 + * @lun:       LUN on which this extent resides
  25 + *
  26 + * Called from file system ->fiemap callback. Will populate extent
  27 + * info as passed in via arguments and copy to user memory. On
  28 + * success, extent count on fieinfo is incremented.
  29 + *
  30 + * Returns 0 on success, -errno on error, 1 if this was the last
  31 + * extent that will fit in user array.
  32 + */
  33 +#define SET_UNKNOWN_FLAGS      (FIEMAP_EXTENT_DELALLOC)
  34 +#define SET_NO_DIRECT_FLAGS    (FIEMAP_EXTENT_DATA_COMPRESSED  \
  35 +                               |FIEMAP_EXTENT_DATA_ENCRYPTED   \
  36 +                               |FIEMAP_EXTENT_NET)
  37 +#define SET_NOT_ALIGNED_FLAGS  (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
  38 +int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
  39 +                           u64 phys, u64 len, u32 flags, dev_t dev)
  40 +{
  41 +       struct fiemap_extent extent = { 0 };
  42 +       struct fiemap_extent *dest = fieinfo->fi_extents_start;
  43 +
  44 +       /* only count the extents */
  45 +       if (fieinfo->fi_extents_max == 0) {
  46 +                fieinfo->fi_extents_mapped++;
  47 +                return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
  48 +       }
  49 +
  50 +       if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
  51 +                return 1;
  52 +
  53 +       if (flags & SET_UNKNOWN_FLAGS)
  54 +                flags |= FIEMAP_EXTENT_UNKNOWN;
  55 +       if (flags & SET_NO_DIRECT_FLAGS)
  56 +                flags |= FIEMAP_EXTENT_NO_DIRECT;
  57 +       if (flags & SET_NOT_ALIGNED_FLAGS)
  58 +                flags |= FIEMAP_EXTENT_NOT_ALIGNED;
  59 +
  60 +       extent.fe_logical = logical;
  61 +       extent.fe_physical = phys;
  62 +       extent.fe_length = len;
  63 +       extent.fe_flags = flags;
  64 +       extent.fe_device = new_encode_dev(dev);
  65 +
  66 +       dest += fieinfo->fi_extents_mapped;
  67 +       if (copy_to_user(dest, &extent, sizeof(extent)))
  68 +                return -EFAULT;
  69 +
  70 +       fieinfo->fi_extents_mapped++;
  71 +       if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
  72 +                return 1;
  73 +
  74 +       return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
  75 +}
  76 +
  77 +static int fiemap_check_ranges(struct super_block *sb,
  78 +                              u64 start, u64 len, u64 *new_len)
  79 +{
  80 +       *new_len = len;
  81 +
  82 +       if (len == 0)
  83 +               return -EINVAL;
  84 +
  85 +       if (start > sb->s_maxbytes)
  86 +               return -EFBIG;
  87 +
  88 +       /*
  89 +        * Shrink request scope to what the fs can actually handle.
  90 +        */
  91 +       if ((len > sb->s_maxbytes) ||
  92 +           (sb->s_maxbytes - len) < start)
  93 +               *new_len = sb->s_maxbytes - start;
  94 +
  95 +       return 0;
  96 +}
  97 +
  98 +/*
  99 + * fiemap_check_flags - check validity of requested flags for fiemap
 100 + * @fieinfo:   Fiemap context passed into ->fiemap
 101 + * @fs_flags:  Set of fiemap flags that the file system understands
 102 + *
 103 + * Called from file system ->fiemap callback. This will compute the
 104 + * intersection of valid fiemap flags and those that the fs supports. That
 105 + * value is then compared against the user supplied flags. In case of bad user
 106 + * flags, the invalid values will be written into the fieinfo structure, and
 107 + * -EBADR is returned, which tells ioctl_fiemap() to return those values to
 108 + * userspace. For this reason, a return code of -EBADR should be preserved.
 109 + *
 110 + * Returns 0 on success, -EBADR on bad flags.
 111 +*/
 112 +int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
 113 +{
 114 +       u32 incompat_flags;
 115 +
 116 +       incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
 117 +       if (incompat_flags) {
 118 +               fieinfo->fi_flags = incompat_flags;
 119 +               return -EBADR;
 120 +       }
 121 +
 122 +       return 0;
 123 +}
 124 +
 125 +int ioctl_fiemap(struct inode *inode, struct file *filp, unsigned long arg)
 126 +{
 127 +       struct fiemap fiemap;
 128 +       u64 len;
 129 +       struct fiemap_extent_info fieinfo = {0, };
 130 +       struct super_block *sb = inode->i_sb;
 131 +       int error = 0;
 132 +
 133 +       if (copy_from_user(&fiemap, (struct fiemap __user *) arg,
 134 +                            sizeof(struct fiemap)))
 135 +                return -EFAULT;
 136 +
 137 +       if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
 138 +                return -EINVAL;
 139 +
 140 +       error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
 141 +                                   &len);
 142 +       if (error)
 143 +               return error;
 144 +
 145 +       fieinfo.fi_flags = fiemap.fm_flags;
 146 +       fieinfo.fi_extents_max = fiemap.fm_extent_count;
 147 +       fieinfo.fi_extents_start = (struct fiemap_extent *)(arg + sizeof(fiemap));
 148 +
 149 +       if (fiemap.fm_extent_count != 0 &&
 150 +           !access_ok(VERIFY_WRITE, (void *)arg,
 151 +                      offsetof(typeof(fiemap), fm_extents[fiemap.fm_extent_count])))
 152 +                      return -EFAULT;
 153 +
 154 +       if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
 155 +               filemap_write_and_wait(inode->i_mapping);
 156 +
 157 +       error = ext3_fiemap(inode, &fieinfo, fiemap.fm_start, len);
 158 +       fiemap.fm_flags = fieinfo.fi_flags;
 159 +       fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
 160 +       if (copy_to_user((char *)arg, &fiemap, sizeof(fiemap)))
 161 +               error = -EFAULT;
 162 +
 163 +       return error;
 164 +}
 165
 166  int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 167                 unsigned long arg)
 168 @@ -262,7 +414,9 @@ flags_err:
 169
 170                 return err;
 171         }
 172 -
 173 +       case EXT3_IOC_FIEMAP: {
 174 +               return ioctl_fiemap(inode, filp, arg);
 175 +       }
 176
 177         default:
 178                 return -ENOTTY;
 179 Index: linux-2.6.16.60-0.23/include/linux/ext3_fs.h
 180 ===================================================================
 181 --- linux-2.6.16.60-0.23.orig/include/linux/ext3_fs.h
 182 +++ linux-2.6.16.60-0.23/include/linux/ext3_fs.h
 183 @@ -260,15 +260,19 @@ struct ext3_new_group_data {
 184  #define        EXT3_IOC_SETFLAGS               _IOW('f', 2, long)
 185  #define        EXT3_IOC_GETVERSION             _IOR('f', 3, long)
 186  #define        EXT3_IOC_SETVERSION             _IOW('f', 4, long)
 187 +#define EXT3_IOC_GETRSVSZ              _IOR('f', 5, long)
 188 +#define EXT3_IOC_SETRSVSZ              _IOW('f', 6, long)
 189  #define EXT3_IOC_GROUP_EXTEND          _IOW('f', 7, unsigned long)
 190  #define EXT3_IOC_GROUP_ADD             _IOW('f', 8,struct ext3_new_group_input)
 191 +#define EXT3_IOC_FIEMAP                        _IOWR('f', 10, struct fiemap)
 192  #define        EXT3_IOC_GETVERSION_OLD         _IOR('v', 1, long)
 193  #define        EXT3_IOC_SETVERSION_OLD         _IOW('v', 2, long)
 194  #ifdef CONFIG_JBD_DEBUG
 195  #define EXT3_IOC_WAIT_FOR_READONLY     _IOR('f', 99, long)
 196  #endif
 197 -#define EXT3_IOC_GETRSVSZ              _IOR('f', 5, long)
 198 -#define EXT3_IOC_SETRSVSZ              _IOW('f', 6, long)
 199 +
 200 +/* FIEMAP flags supported by ext3 */
 201 +#define EXT3_FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC)
 202
 203  /*
 204   *  Mount options
 205 @@ -996,6 +1000,9 @@ extern int ext3_writepage_trans_blocks(s
 206  /* ioctl.c */
 207  extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
 208                        unsigned long);
 209 +struct fiemap_extent_info;
 210 +extern int ext3_fiemap(struct inode *, struct fiemap_extent_info *, __u64,
 211 +                      __u64);
 212
 213  /* namei.c */
 214  extern int ext3_orphan_add(handle_t *, struct inode *);
 215 Index: linux-2.6.16.60-0.23/include/linux/ext3_extents.h
 216 ===================================================================
 217 --- linux-2.6.16.60-0.23.orig/include/linux/ext3_extents.h
 218 +++ linux-2.6.16.60-0.23/include/linux/ext3_extents.h
 219 @@ -170,7 +170,10 @@ struct ext3_extents_helpers {
 220   */
 221  typedef int (*ext_prepare_callback)(struct ext3_extents_tree *,
 222                                     struct ext3_ext_path *,
 223 -                                   struct ext3_ext_cache *);
 224 +                                   struct ext3_ext_cache *,
 225 +                                   struct ext3_extent *);
 226 +
 227 +#define HAVE_EXT_PREPARE_CB_EXTENT
 228
 229  #define EXT_CONTINUE   0
 230  #define EXT_BREAK      1
 231 @@ -179,6 +182,25 @@ typedef int (*ext_prepare_callback)(stru
 232
 233  #define EXT_MAX_BLOCK  0xffffffff
 234
 235 +/*
 236 + * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
 237 + * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
 238 + * MSB of ee_len field in the extent datastructure to signify if this
 239 + * particular extent is an initialized extent or an uninitialized (i.e.
 240 + * preallocated).
 241 + * EXT_UNINIT_MAX_LEN is the maximum number of blocks we can have in an
 242 + * uninitialized extent.
 243 + * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an
 244 + * uninitialized one. In other words, if MSB of ee_len is set, it is an
 245 + * uninitialized extent with only one special scenario when ee_len = 0x8000.
 246 + * In this case we can not have an uninitialized extent of zero length and
 247 + * thus we make it as a special case of initialized extent with 0x8000 length.
 248 + * This way we get better extent-to-group alignment for initialized extents.
 249 + * Hence, the maximum number of blocks we can have in an *initialized*
 250 + * extent is 2^15 (32768) and in an *uninitialized* extent is 2^15-1 (32767).
 251 + */
 252 +#define        EXT_INIT_MAX_LEN        (1UL << 15)
 253 +#define        EXT_UNINIT_MAX_LEN      (EXT_INIT_MAX_LEN - 1)
 254
 255  #define EXT_FIRST_EXTENT(__hdr__) \
 256         ((struct ext3_extent *) (((char *) (__hdr__)) +         \
 257 @@ -242,6 +264,12 @@ struct ext3_extent_tree_stats {
 258         int leaf_num;
 259  };
 260
 261 +static inline int ext3_ext_is_uninitialized(struct ext3_extent *ext)
 262 +{
 263 +       /* Extent with ee_len of 0x8000 is treated as an initialized extent */
 264 +       return (le16_to_cpu(ext->ee_len) > EXT_INIT_MAX_LEN);
 265 +}
 266 +
 267  extern int ext3_ext_search_left(struct ext3_extents_tree *, struct ext3_ext_path *, unsigned long *, unsigned long *);
 268  extern int ext3_ext_search_right(struct ext3_extents_tree *, struct ext3_ext_path *, unsigned long *, unsigned long *);
 269  extern void ext3_init_tree_desc(struct ext3_extents_tree *, struct inode *);
 270 Index: linux-2.6.16.60-0.23/fs/ext3/extents.c
 271 ===================================================================
 272 --- linux-2.6.16.60-0.23.orig/fs/ext3/extents.c
 273 +++ linux-2.6.16.60-0.23/fs/ext3/extents.c
 274 @@ -41,6 +41,7 @@
 275  #include <linux/string.h>
 276  #include <linux/slab.h>
 277  #include <linux/ext3_extents.h>
 278 +#include "fiemap.h"
 279  #include <asm/uaccess.h>
 280
 281
 282 @@ -1488,7 +1489,7 @@ int ext3_ext_walk_space(struct ext3_exte
 283
 284                 EXT_ASSERT(cbex.ec_len > 0);
 285                 EXT_ASSERT(path[depth].p_hdr);
 286 -               err = func(tree, path, &cbex);
 287 +               err = func(tree, path, &cbex, ex);
 288                 ext3_ext_drop_refs(path);
 289
 290                 if (err < 0)
 291 @@ -2502,7 +2503,109 @@ int ext3_ext_calc_blockmap_metadata(stru
 292         ext3_init_tree_desc(&tree, inode);
 293         return ext3_ext_calc_metadata_amount(&tree, blocks);
 294  }
 295 -
 296 +
 297 +/*
 298 + * Callback function called for each extent to gather FIEMAP information.
 299 + */
 300 +int ext3_ext_fiemap_cb(struct ext3_extents_tree *tree,
 301 +                      struct ext3_ext_path *path, struct ext3_ext_cache *newex,
 302 +                      struct ext3_extent *ex)
 303 +{
 304 +       struct fiemap_extent_info *fieinfo = (struct fiemap_extent_info *)tree->private;
 305 +       struct inode *inode = tree->inode;
 306 +       unsigned long blksize_bits = inode->i_sb->s_blocksize_bits;
 307 +       __u64   logical;
 308 +       __u64   physical;
 309 +       __u64   length;
 310 +       __u32   flags = 0;
 311 +       int     error;
 312 +
 313 +       logical =  (__u64)newex->ec_block << blksize_bits;
 314 +
 315 +       if (newex->ec_type == EXT3_EXT_CACHE_GAP) {
 316 +               pgoff_t offset;
 317 +               struct page *page;
 318 +               struct buffer_head *bh = NULL;
 319 +
 320 +               offset = logical >> PAGE_SHIFT;
 321 +               page = find_get_page(inode->i_mapping, offset);
 322 +               if (!page || !page_has_buffers(page))
 323 +                       return EXT_CONTINUE;
 324 +
 325 +               bh = page_buffers(page);
 326 +
 327 +               if (!bh)
 328 +                       return EXT_CONTINUE;
 329 +
 330 +               if (buffer_delay(bh)) {
 331 +                       flags |= FIEMAP_EXTENT_DELALLOC;
 332 +                       page_cache_release(page);
 333 +               } else {
 334 +                       page_cache_release(page);
 335 +                       return EXT_CONTINUE;
 336 +               }
 337 +       }
 338 +
 339 +       physical = (__u64)newex->ec_start << blksize_bits;
 340 +       length =   (__u64)newex->ec_len << blksize_bits;
 341 +
 342 +       if (ex && ext3_ext_is_uninitialized(ex))
 343 +               flags |= FIEMAP_EXTENT_UNWRITTEN;
 344 +
 345 +       /*
 346 +        * If this extent reaches EXT_MAX_BLOCK, it must be last.
 347 +        *
 348 +        * Or if ext3_ext_next_allocated_block is EXT_MAX_BLOCK,
 349 +        * this indicates no more allocated blocks.
 350 +        *
 351 +        * XXX this might miss a single-block extent at EXT_MAX_BLOCK
 352 +        */
 353 +       if (logical + length - 1 == EXT_MAX_BLOCK ||
 354 +           ext3_ext_next_allocated_block(path) == EXT_MAX_BLOCK)
 355 +               flags |= FIEMAP_EXTENT_LAST;
 356 +
 357 +       error = fiemap_fill_next_extent(fieinfo, logical, physical,
 358 +                                       length, flags, inode->i_sb->s_dev);
 359 +       if (error < 0)
 360 +               return error;
 361 +       if (error == 1)
 362 +               return EXT_BREAK;
 363 +
 364 +       return EXT_CONTINUE;
 365 +}
 366 +
 367 +int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 368 +               __u64 start, __u64 len)
 369 +{
 370 +       struct ext3_extents_tree tree;
 371 +       unsigned long start_blk;
 372 +       unsigned long len_blks;
 373 +       int error = 0;
 374 +
 375 +       if (!(EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL))
 376 +               return -EOPNOTSUPP;
 377 +
 378 +       if (fiemap_check_flags(fieinfo, EXT3_FIEMAP_FLAGS_COMPAT))
 379 +               return -EBADR;
 380 +
 381 +       start_blk = start >> inode->i_sb->s_blocksize_bits;
 382 +       len_blks = (len + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 383 +
 384 +       ext3_init_tree_desc(&tree, inode);
 385 +       tree.private = fieinfo;
 386 +
 387 +       /*
 388 +        * Walk the extent tree gathering extent information.
 389 +        * ext3_ext_fiemap_cb will push extents back to user.
 390 +        */
 391 +       down(&EXT3_I(inode)->truncate_sem);
 392 +       error = ext3_ext_walk_space(&tree, start_blk, len_blks,
 393 +                                   ext3_ext_fiemap_cb);
 394 +       up(&EXT3_I(inode)->truncate_sem);
 395 +
 396 +       return error;
 397 +}
 398 +
 399  EXPORT_SYMBOL(ext3_init_tree_desc);
 400  EXPORT_SYMBOL(ext3_mark_inode_dirty);
 401  EXPORT_SYMBOL(ext3_ext_invalidate_cache);
 402 Index: linux-2.6.16.60-0.23/fs/ext3/fiemap.h
 403 ===================================================================
 404 --- /dev/null
 405 +++ linux-2.6.16.60-0.23/fs/ext3/fiemap.h
 406 @@ -0,0 +1,84 @@
 407 +/*
 408 + * FIEMAP ioctl infrastructure.
 409 + *
 410 + * Copyright 2008 Sun Microsystems, Inc.
 411 + *
 412 + * Author: Kalpak Shah <kalpak.shah@sun.com>
 413 + *         Andreas Dilger <adilger@sun.com>
 414 + */
 415 +
 416 +#ifndef _LINUX_EXT3_FIEMAP_H
 417 +#define _LINUX_EXT3_FIEMAP_H
 418 +
 419 +struct fiemap_extent {
 420 +       __u64 fe_logical;  /* logical offset in bytes for the start of
 421 +                           * the extent from the beginning of the file */
 422 +       __u64 fe_physical; /* physical offset in bytes for the start
 423 +                           * of the extent from the beginning of the disk */
 424 +       __u64 fe_length;   /* length in bytes for this extent */
 425 +       __u32 fe_flags;    /* FIEMAP_EXTENT_* flags for this extent */
 426 +       __u32 fe_device;   /* device number for this extent */
 427 +};
 428 +
 429 +struct fiemap {
 430 +       __u64 fm_start;  /* logical offset (inclusive) at
 431 +                                * which to start mapping (in) */
 432 +       __u64 fm_length;        /* logical length of mapping which
 433 +                                * userspace wants (in) */
 434 +       __u32 fm_flags;  /* FIEMAP_FLAG_* flags for request (in/out) */
 435 +       __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
 436 +       __u32 fm_extent_count;  /* size of fm_extents array (in) */
 437 +       __u32 fm_reserved;
 438 +       struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
 439 +};
 440 +
 441 +/*
 442 + * FIEMAP helper definition.
 443 + */
 444 +struct fiemap_extent_info {
 445 +       unsigned int    fi_flags;               /* Flags as passed from user */
 446 +       unsigned int    fi_extents_mapped;      /* Number of mapped extents */
 447 +       unsigned int    fi_extents_max;         /* Size of fiemap_extent array*/
 448 +       struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent array */
 449 +};
 450 +
 451 +int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
 452 +int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
 453 +                           u64 phys, u64 len, u32 flags, u32 lun);
 454 +
 455 +#define        FIEMAP_MAX_OFFSET       (~0ULL)
 456 +
 457 +#define        FIEMAP_FLAG_SYNC        0x00000001 /* sync file data before map */
 458 +#define        FIEMAP_FLAG_XATTR       0x00000002 /* map extended attribute tree */
 459 +
 460 +/* ldiskfs only supports FLAG_SYNC flag currently */
 461 +#define FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
 462 +
 463 +
 464 +#define FIEMAP_EXTENT_LAST             0x00000001 /* Last extent in file. */
 465 +#define FIEMAP_EXTENT_UNKNOWN          0x00000002 /* Data location unknown. */
 466 +#define FIEMAP_EXTENT_DELALLOC         0x00000004 /* Location still pending.
 467 +                                                  * Sets EXTENT_UNKNOWN. */
 468 +#define FIEMAP_EXTENT_NO_DIRECT                0x00000008 /* Data mapping undefined */
 469 +#define FIEMAP_EXTENT_SECONDARY                0x00000010 /* Data copied offline. May
 470 +                                                  * set EXTENT_NO_DIRECT. */
 471 +#define FIEMAP_EXTENT_NET              0x00000020 /* Data stored remotely.
 472 +                                                  * Sets EXTENT_NO_DIRECT. */
 473 +#define FIEMAP_EXTENT_DATA_COMPRESSED  0x00000040 /* Data is compressed by fs.
 474 +                                                  * Sets EXTENT_NO_DIRECT. */
 475 +#define FIEMAP_EXTENT_DATA_ENCRYPTED   0x00000080 /* Data is encrypted by fs.
 476 +                                                  * Sets EXTENT_NO_DIRECT. */
 477 +#define FIEMAP_EXTENT_NOT_ALIGNED      0x00000100 /* Extent offsets may not be
 478 +                                                  * block aligned. */
 479 +#define FIEMAP_EXTENT_DATA_INLINE      0x00000200 /* Data mixed with metadata.
 480 +                                                  * Sets EXTENT_NOT_ALIGNED.*/
 481 +#define FIEMAP_EXTENT_DATA_TAIL                0x00000400 /* Multiple files in block.
 482 +                                                  * Sets EXTENT_NOT_ALIGNED.*/
 483 +#define FIEMAP_EXTENT_UNWRITTEN                0x00000800 /* Space allocated, but
 484 +                                                  * no data (i.e. zero). */
 485 +#define FIEMAP_EXTENT_MERGED           0x00001000 /* File does not natively
 486 +                                                  * support extents. Result
 487 +                                                  * merged for efficiency. */
 488 +
 489 +#endif /* _LINUX_EXT3_FIEMAP_H */
 490 +