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-2.6.16.60-0.37/fs/ext3/ioctl.c
   5 ===================================================================
   6 --- linux-2.6.16.60-0.37.orig/fs/ext3/ioctl.c
   7 +++ linux-2.6.16.60-0.37/fs/ext3/ioctl.c
   8 @@ -15,7 +15,161 @@
   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_ENCRYPTED   \
  35 +                               |FIEMAP_EXTENT_NET)
  36 +#define SET_NO_UNMOUNTED_IO_FLAGS       (FIEMAP_EXTENT_DATA_ENCRYPTED)
  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 +       if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
  60 +               flags |= FIEMAP_EXTENT_ENCODED;
  61 +
  62 +       extent.fe_logical = logical;
  63 +       extent.fe_physical = phys;
  64 +       extent.fe_length = len;
  65 +       extent.fe_flags = flags;
  66 +       extent.fe_device = new_encode_dev(dev);
  67 +
  68 +       dest += fieinfo->fi_extents_mapped;
  69 +       if (copy_to_user(dest, &extent, sizeof(extent)))
  70 +               return -EFAULT;
  71 +
  72 +       fieinfo->fi_extents_mapped++;
  73 +       if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
  74 +               return 1;
  75 +
  76 +       return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
  77 +}
  78 +
  79 +static int fiemap_check_ranges(struct super_block *sb,
  80 +                              u64 start, u64 len, u64 *new_len)
  81 +{
  82 +       *new_len = len;
  83 +
  84 +       if (len == 0)
  85 +               return -EINVAL;
  86 +
  87 +       if (start > sb->s_maxbytes)
  88 +               return -EFBIG;
  89 +
  90 +       /*
  91 +        * Shrink request scope to what the fs can actually handle.
  92 +        */
  93 +       if ((len > sb->s_maxbytes) ||
  94 +           (sb->s_maxbytes - len) < start)
  95 +               *new_len = sb->s_maxbytes - start;
  96 +
  97 +       return 0;
  98 +}
  99 +
 100 +/*
 101 + * fiemap_check_flags - check validity of requested flags for fiemap
 102 + * @fieinfo:   Fiemap context passed into ->fiemap
 103 + * @fs_flags:  Set of fiemap flags that the file system understands
 104 + *
 105 + * Called from file system ->fiemap callback. This will compute the
 106 + * intersection of valid fiemap flags and those that the fs supports. That
 107 + * value is then compared against the user supplied flags. In case of bad user
 108 + * flags, the invalid values will be written into the fieinfo structure, and
 109 + * -EBADR is returned, which tells ioctl_fiemap() to return those values to
 110 + * userspace. For this reason, a return code of -EBADR should be preserved.
 111 + *
 112 + * Returns 0 on success, -EBADR on bad flags.
 113 +*/
 114 +int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
 115 +{
 116 +       u32 incompat_flags;
 117 +
 118 +       incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
 119 +       if (incompat_flags) {
 120 +               fieinfo->fi_flags = incompat_flags;
 121 +               return -EBADR;
 122 +       }
 123 +
 124 +       return 0;
 125 +}
 126 +
 127 +int ioctl_fiemap(struct inode *inode, struct file *filp, unsigned long arg)
 128 +{
 129 +       struct fiemap fiemap;
 130 +       u64 len;
 131 +       struct fiemap_extent_info fieinfo = {0, };
 132 +       struct super_block *sb = inode->i_sb;
 133 +       int error = 0;
 134 +
 135 +       if (copy_from_user(&fiemap, (struct fiemap __user *) arg,
 136 +                          sizeof(struct fiemap)))
 137 +                return -EFAULT;
 138 +
 139 +       if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
 140 +               return -EINVAL;
 141 +
 142 +       error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
 143 +                                   &len);
 144 +       if (error)
 145 +               return error;
 146 +
 147 +       fieinfo.fi_flags = fiemap.fm_flags;
 148 +       fieinfo.fi_extents_max = fiemap.fm_extent_count;
 149 +       fieinfo.fi_extents_start = (struct fiemap_extent *)(arg + sizeof(fiemap));
 150 +
 151 +       if (fiemap.fm_extent_count != 0 &&
 152 +           !access_ok(VERIFY_WRITE, (void *)arg,
 153 +                      offsetof(typeof(fiemap), fm_extents[fiemap.fm_extent_count])))
 154 +               return -EFAULT;
 155 +
 156 +       if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
 157 +               filemap_write_and_wait(inode->i_mapping);
 158 +
 159 +       error = ext3_fiemap(inode, &fieinfo, fiemap.fm_start, len);
 160 +       fiemap.fm_flags = fieinfo.fi_flags;
 161 +       fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
 162 +       if (copy_to_user((char *)arg, &fiemap, sizeof(fiemap)))
 163 +               error = -EFAULT;
 164 +
 165 +       return error;
 166 +}
 167
 168  int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
 169                 unsigned long arg)
 170 @@ -262,7 +416,9 @@ flags_err:
 171
 172                 return err;
 173         }
 174 -
 175 +       case EXT3_IOC_FIEMAP: {
 176 +               return ioctl_fiemap(inode, filp, arg);
 177 +       }
 178
 179         default:
 180                 return -ENOTTY;
 181 Index: linux-2.6.16.60-0.37/include/linux/ext3_fs.h
 182 ===================================================================
 183 --- linux-2.6.16.60-0.37.orig/include/linux/ext3_fs.h
 184 +++ linux-2.6.16.60-0.37/include/linux/ext3_fs.h
 185 @@ -261,15 +261,19 @@ struct ext3_new_group_data {
 186  #define        EXT3_IOC_SETFLAGS               _IOW('f', 2, long)
 187  #define        EXT3_IOC_GETVERSION             _IOR('f', 3, long)
 188  #define        EXT3_IOC_SETVERSION             _IOW('f', 4, long)
 189 +#define EXT3_IOC_GETRSVSZ              _IOR('f', 5, long)
 190 +#define EXT3_IOC_SETRSVSZ              _IOW('f', 6, long)
 191  #define EXT3_IOC_GROUP_EXTEND          _IOW('f', 7, unsigned long)
 192  #define EXT3_IOC_GROUP_ADD             _IOW('f', 8,struct ext3_new_group_input)
 193 +#define EXT3_IOC_FIEMAP                        _IOWR('f', 11, struct fiemap)
 194  #define        EXT3_IOC_GETVERSION_OLD         _IOR('v', 1, long)
 195  #define        EXT3_IOC_SETVERSION_OLD         _IOW('v', 2, long)
 196  #ifdef CONFIG_JBD_DEBUG
 197  #define EXT3_IOC_WAIT_FOR_READONLY     _IOR('f', 99, long)
 198  #endif
 199 -#define EXT3_IOC_GETRSVSZ              _IOR('f', 5, long)
 200 -#define EXT3_IOC_SETRSVSZ              _IOW('f', 6, long)
 201 +
 202 +/* FIEMAP flags supported by ext3 */
 203 +#define EXT3_FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC)
 204
 205  /*
 206   *  Mount options
 207 @@ -997,6 +1001,9 @@ extern int ext3_writepage_trans_blocks(s
 208  /* ioctl.c */
 209  extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
 210                        unsigned long);
 211 +struct fiemap_extent_info;
 212 +extern int ext3_fiemap(struct inode *, struct fiemap_extent_info *, __u64,
 213 +                      __u64);
 214
 215  /* namei.c */
 216  extern int ext3_orphan_add(handle_t *, struct inode *);
 217 Index: linux-2.6.16.60-0.37/include/linux/ext3_extents.h
 218 ===================================================================
 219 --- linux-2.6.16.60-0.37.orig/include/linux/ext3_extents.h
 220 +++ linux-2.6.16.60-0.37/include/linux/ext3_extents.h
 221 @@ -170,7 +170,10 @@ struct ext3_extents_helpers {
 222   */
 223  typedef int (*ext_prepare_callback)(struct ext3_extents_tree *,
 224                                     struct ext3_ext_path *,
 225 -                                   struct ext3_ext_cache *);
 226 +                                   struct ext3_ext_cache *,
 227 +                                   struct ext3_extent *);
 228 +
 229 +#define HAVE_EXT_PREPARE_CB_EXTENT
 230
 231  #define EXT_CONTINUE   0
 232  #define EXT_BREAK      1
 233 @@ -180,6 +183,25 @@ typedef int (*ext_prepare_callback)(stru
 234  #define EXT_MAX_BLOCK  0xffffffff
 235  #define EXT_UNSET_BLOCK 1
 236
 237 +/*
 238 + * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
 239 + * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
 240 + * MSB of ee_len field in the extent datastructure to signify if this
 241 + * particular extent is an initialized extent or an uninitialized (i.e.
 242 + * preallocated).
 243 + * EXT_UNINIT_MAX_LEN is the maximum number of blocks we can have in an
 244 + * uninitialized extent.
 245 + * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an
 246 + * uninitialized one. In other words, if MSB of ee_len is set, it is an
 247 + * uninitialized extent with only one special scenario when ee_len = 0x8000.
 248 + * In this case we can not have an uninitialized extent of zero length and
 249 + * thus we make it as a special case of initialized extent with 0x8000 length.
 250 + * This way we get better extent-to-group alignment for initialized extents.
 251 + * Hence, the maximum number of blocks we can have in an *initialized*
 252 + * extent is 2^15 (32768) and in an *uninitialized* extent is 2^15-1 (32767).
 253 + */
 254 +#define        EXT_INIT_MAX_LEN        (1UL << 15)
 255 +#define        EXT_UNINIT_MAX_LEN      (EXT_INIT_MAX_LEN - 1)
 256
 257  #define EXT_FIRST_EXTENT(__hdr__) \
 258         ((struct ext3_extent *) (((char *) (__hdr__)) +         \
 259 @@ -243,6 +265,12 @@ struct ext3_extent_tree_stats {
 260         int leaf_num;
 261  };
 262
 263 +static inline int ext3_ext_is_uninitialized(struct ext3_extent *ext)
 264 +{
 265 +       /* Extent with ee_len of 0x8000 is treated as an initialized extent */
 266 +       return (le16_to_cpu(ext->ee_len) > EXT_INIT_MAX_LEN);
 267 +}
 268 +
 269  extern int ext3_ext_search_left(struct ext3_extents_tree *, struct ext3_ext_path *, unsigned long *, unsigned long *);
 270  extern int ext3_ext_search_right(struct ext3_extents_tree *, struct ext3_ext_path *, unsigned long *, unsigned long *);
 271  extern void ext3_init_tree_desc(struct ext3_extents_tree *, struct inode *);
 272 Index: linux-2.6.16.60-0.37/fs/ext3/extents.c
 273 ===================================================================
 274 --- linux-2.6.16.60-0.37.orig/fs/ext3/extents.c
 275 +++ linux-2.6.16.60-0.37/fs/ext3/extents.c
 276 @@ -41,6 +41,7 @@
 277  #include <linux/string.h>
 278  #include <linux/slab.h>
 279  #include <linux/ext3_extents.h>
 280 +#include "fiemap.h"
 281  #include <asm/uaccess.h>
 282
 283
 284 @@ -1488,7 +1489,7 @@ int ext3_ext_walk_space(struct ext3_exte
 285
 286                 EXT_ASSERT(cbex.ec_len > 0);
 287                 EXT_ASSERT(path[depth].p_hdr);
 288 -               err = func(tree, path, &cbex);
 289 +               err = func(tree, path, &cbex, ex);
 290                 ext3_ext_drop_refs(path);
 291
 292                 if (err < 0)
 293 @@ -2502,7 +2503,109 @@ int ext3_ext_calc_blockmap_metadata(stru
 294         ext3_init_tree_desc(&tree, inode);
 295         return ext3_ext_calc_metadata_amount(&tree, blocks);
 296  }
 297 -
 298 +
 299 +/*
 300 + * Callback function called for each extent to gather FIEMAP information.
 301 + */
 302 +int ext3_ext_fiemap_cb(struct ext3_extents_tree *tree,
 303 +                      struct ext3_ext_path *path, struct ext3_ext_cache *newex,
 304 +                      struct ext3_extent *ex)
 305 +{
 306 +       struct fiemap_extent_info *fieinfo = (struct fiemap_extent_info *)tree->private;
 307 +       struct inode *inode = tree->inode;
 308 +       unsigned char blksize_bits = inode->i_sb->s_blocksize_bits;
 309 +       __u64   logical;
 310 +       __u64   physical;
 311 +       __u64   length;
 312 +       __u32   flags = 0;
 313 +       int     error;
 314 +
 315 +       logical =  (__u64)newex->ec_block << blksize_bits;
 316 +
 317 +       if (newex->ec_type == EXT3_EXT_CACHE_GAP) {
 318 +               pgoff_t offset;
 319 +               struct page *page;
 320 +               struct buffer_head *bh = NULL;
 321 +
 322 +               offset = logical >> PAGE_SHIFT;
 323 +               page = find_get_page(inode->i_mapping, offset);
 324 +               if (!page || !page_has_buffers(page))
 325 +                       return EXT_CONTINUE;
 326 +
 327 +               bh = page_buffers(page);
 328 +
 329 +               if (!bh)
 330 +                       return EXT_CONTINUE;
 331 +
 332 +               if (buffer_delay(bh)) {
 333 +                       flags |= FIEMAP_EXTENT_DELALLOC;
 334 +                       page_cache_release(page);
 335 +               } else {
 336 +                       page_cache_release(page);
 337 +                       return EXT_CONTINUE;
 338 +               }
 339 +       }
 340 +
 341 +       physical = (__u64)newex->ec_start << blksize_bits;
 342 +       length =   (__u64)newex->ec_len << blksize_bits;
 343 +
 344 +       if (ex && ext3_ext_is_uninitialized(ex))
 345 +               flags |= FIEMAP_EXTENT_UNWRITTEN;
 346 +
 347 +       /*
 348 +        * If this extent reaches EXT_MAX_BLOCK, it must be last.
 349 +        *
 350 +        * Or if ext3_ext_next_allocated_block is EXT_MAX_BLOCK,
 351 +        * this indicates no more allocated blocks.
 352 +        *
 353 +        * XXX this might miss a single-block extent at EXT_MAX_BLOCK
 354 +        */
 355 +       if (ext3_ext_next_allocated_block(path) == EXT_MAX_BLOCK ||
 356 +           newex->ec_block + newex->ec_len - 1 == EXT_MAX_BLOCK)
 357 +               flags |= FIEMAP_EXTENT_LAST;
 358 +
 359 +       error = fiemap_fill_next_extent(fieinfo, logical, physical,
 360 +                                       length, flags, inode->i_sb->s_dev);
 361 +       if (error < 0)
 362 +               return error;
 363 +       if (error == 1)
 364 +               return EXT_BREAK;
 365 +
 366 +       return EXT_CONTINUE;
 367 +}
 368 +
 369 +int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 370 +               __u64 start, __u64 len)
 371 +{
 372 +       struct ext3_extents_tree tree;
 373 +       unsigned long start_blk;
 374 +       unsigned long len_blks;
 375 +       int error = 0;
 376 +
 377 +       if (!(EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL))
 378 +               return -EOPNOTSUPP;
 379 +
 380 +       if (fiemap_check_flags(fieinfo, EXT3_FIEMAP_FLAGS_COMPAT))
 381 +               return -EBADR;
 382 +
 383 +       start_blk = start >> inode->i_sb->s_blocksize_bits;
 384 +       len_blks = (len + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 385 +
 386 +       ext3_init_tree_desc(&tree, inode);
 387 +       tree.private = fieinfo;
 388 +
 389 +       /*
 390 +        * Walk the extent tree gathering extent information.
 391 +        * ext3_ext_fiemap_cb will push extents back to user.
 392 +        */
 393 +       down(&EXT3_I(inode)->truncate_sem);
 394 +       error = ext3_ext_walk_space(&tree, start_blk, len_blks,
 395 +                                   ext3_ext_fiemap_cb);
 396 +       up(&EXT3_I(inode)->truncate_sem);
 397 +
 398 +       return error;
 399 +}
 400 +
 401  EXPORT_SYMBOL(ext3_init_tree_desc);
 402  EXPORT_SYMBOL(ext3_mark_inode_dirty);
 403  EXPORT_SYMBOL(ext3_ext_invalidate_cache);
 404 Index: linux-2.6.16.60-0.37/fs/ext3/fiemap.h
 405 ===================================================================
 406 --- /dev/null
 407 +++ linux-2.6.16.60-0.37/fs/ext3/fiemap.h
 408 @@ -0,0 +1,85 @@
 409 +/*
 410 + * FIEMAP ioctl infrastructure.
 411 + *
 412 + * Copyright 2008 Sun Microsystems, Inc.
 413 + *
 414 + * Author: Kalpak Shah <kalpak.shah@sun.com>
 415 + *         Andreas Dilger <adilger@sun.com>
 416 + */
 417 +
 418 +#ifndef _LINUX_EXT3_FIEMAP_H
 419 +#define _LINUX_EXT3_FIEMAP_H
 420 +
 421 +struct fiemap_extent {
 422 +       __u64 fe_logical;  /* logical offset in bytes for the start of
 423 +                           * the extent from the beginning of the file */
 424 +       __u64 fe_physical; /* physical offset in bytes for the start
 425 +                           * of the extent from the beginning of the disk */
 426 +       __u64 fe_length;   /* length in bytes for this extent */
 427 +       __u64 fe_reserved64[2];
 428 +       __u32 fe_flags;    /* FIEMAP_EXTENT_* flags for this extent */
 429 +       __u32 fe_device;   /* device number for this extent */
 430 +       __u32 fe_reserved[2];
 431 +};
 432 +
 433 +struct fiemap {
 434 +       __u64 fm_start;  /* logical offset (inclusive) at
 435 +                                * which to start mapping (in) */
 436 +       __u64 fm_length;        /* logical length of mapping which
 437 +                                * userspace wants (in) */
 438 +       __u32 fm_flags;  /* FIEMAP_FLAG_* flags for request (in/out) */
 439 +       __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
 440 +       __u32 fm_extent_count;  /* size of fm_extents array (in) */
 441 +       __u32 fm_reserved;
 442 +       struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
 443 +};
 444 +
 445 +/*
 446 + * FIEMAP helper definition.
 447 + */
 448 +struct fiemap_extent_info {
 449 +       unsigned int    fi_flags;               /* Flags as passed from user */
 450 +       unsigned int    fi_extents_mapped;      /* Number of mapped extents */
 451 +       unsigned int    fi_extents_max;         /* Size of fiemap_extent array*/
 452 +       struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent array */
 453 +};
 454 +
 455 +int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
 456 +int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
 457 +                           u64 phys, u64 len, u32 flags, u32 lun);
 458 +
 459 +#define        FIEMAP_MAX_OFFSET       (~0ULL)
 460 +
 461 +#define        FIEMAP_FLAG_SYNC        0x00000001 /* sync file data before map */
 462 +#define        FIEMAP_FLAG_XATTR       0x00000002 /* map extended attribute tree */
 463 +
 464 +/* ldiskfs only supports FLAG_SYNC flag currently */
 465 +#define FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
 466 +
 467 +#define FIEMAP_EXTENT_LAST             0x00000001 /* Last extent in file. */
 468 +#define FIEMAP_EXTENT_UNKNOWN          0x00000002 /* Data location unknown. */
 469 +#define FIEMAP_EXTENT_DELALLOC         0x00000004 /* Location still pending.
 470 +                                                   * Sets EXTENT_UNKNOWN. */
 471 +#define FIEMAP_EXTENT_ENCODED          0x00000008 /* Data can not be read
 472 +                                                   * while fs is unmounted */
 473 +#define FIEMAP_EXTENT_DATA_ENCRYPTED   0x00000080 /* Data is encrypted by fs.
 474 +                                                   * Sets EXTENT_NO_DIRECT. */
 475 +#define FIEMAP_EXTENT_NOT_ALIGNED      0x00000100 /* Extent offsets may not be
 476 +                                                   * block aligned. */
 477 +#define FIEMAP_EXTENT_DATA_INLINE      0x00000200 /* Data mixed with metadata.
 478 +                                                   * Sets EXTENT_NOT_ALIGNED.*/
 479 +#define FIEMAP_EXTENT_DATA_TAIL                0x00000400 /* Multiple files in block.
 480 +                                                   * Sets EXTENT_NOT_ALIGNED.*/
 481 +#define FIEMAP_EXTENT_UNWRITTEN                0x00000800 /* Space allocated, but
 482 +                                                   * no data (i.e. zero). */
 483 +#define FIEMAP_EXTENT_MERGED           0x00001000 /* File does not natively
 484 +                                                   * support extents. Result
 485 +                                                   * merged for efficiency. */
 486 +
 487 +/* Lustre specific flags - use a high bit, don't conflict with upstream flag */
 488 +#define FIEMAP_EXTENT_NO_DIRECT                0x40000000 /* Data mapping undefined */
 489 +#define FIEMAP_EXTENT_NET              0x80000000 /* Data stored remotely.
 490 +                                                   * Sets NO_DIRECT flag */
 491 +
 492 +#endif /* _LINUX_EXT3_FIEMAP_H */
 493 +