ldiskfs/kernel_patches/patches/ext4-fiemap-2.6-sles11.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-2.6.27.21-0.1/fs/ext4/ioctl.c
   5 ===================================================================
   6 --- linux-2.6.27.21-0.1.orig/fs/ext4/ioctl.c
   7 +++ linux-2.6.27.21-0.1/fs/ext4/ioctl.c
   8 @@ -18,6 +18,162 @@
   9  #include "ext4_jbd2.h"
  10  #include "ext4.h"
  11
  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 = ext4_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  long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 169  {
 170         struct inode *inode = filp->f_dentry->d_inode;
 171 @@ -263,6 +419,10 @@ setversion_out:
 172                 return err;
 173         }
 174
 175 +       case EXT4_IOC_FIEMAP: {
 176 +               return ioctl_fiemap(inode, filp, arg);
 177 +       }
 178 +
 179         default:
 180                 return -ENOTTY;
 181         }
 182 Index: linux-2.6.27.21-0.1/fs/ext4/ext4.h
 183 ===================================================================
 184 --- linux-2.6.27.21-0.1.orig/fs/ext4/ext4.h
 185 +++ linux-2.6.27.21-0.1/fs/ext4/ext4.h
 186 @@ -302,7 +302,8 @@ struct ext4_new_group_data {
 187  #define EXT4_IOC_GROUP_EXTEND          _IOW('f', 7, unsigned long)
 188  #define EXT4_IOC_GROUP_ADD             _IOW('f', 8, struct ext4_new_group_input)
 189  #define EXT4_IOC_MIGRATE               _IO('f', 9)
 190 - /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
 191 +#define EXT4_IOC_FIEMAP                        _IOWR('f', 11, struct fiemap)
 192 +
 193
 194  /*
 195   * ioctl commands in 32 bit emulation
 196 @@ -320,6 +321,8 @@ struct ext4_new_group_data {
 197  #define EXT4_IOC32_GETVERSION_OLD      FS_IOC32_GETVERSION
 198  #define EXT4_IOC32_SETVERSION_OLD      FS_IOC32_SETVERSION
 199
 200 +/* FIEMAP flags supported by ext4 */
 201 +#define EXT4_FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC)
 202
 203  /*
 204   *  Mount options
 205 @@ -1130,6 +1133,9 @@ extern int ext4_page_mkwrite(struct vm_a
 206  /* ioctl.c */
 207  extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
 208  extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
 209 +struct fiemap_extent_info;
 210 +extern int ext4_fiemap(struct inode *, struct fiemap_extent_info *, __u64,
 211 +                      __u64);
 212
 213  /* migrate.c */
 214  extern int ext4_ext_migrate(struct inode *);
 215 Index: linux-2.6.27.21-0.1/fs/ext4/ext4_extents.h
 216 ===================================================================
 217 --- linux-2.6.27.21-0.1.orig/fs/ext4/ext4_extents.h
 218 +++ linux-2.6.27.21-0.1/fs/ext4/ext4_extents.h
 219 @@ -128,6 +128,22 @@ struct ext4_ext_path {
 220  #define EXT_MAX_BLOCK  0xffffffff
 221
 222  /*
 223 + * to be called by ext4_ext_walk_space()
 224 + * negative retcode - error
 225 + * positive retcode - signal for ext4_ext_walk_space(), see below
 226 + * callback must return valid extent (passed or newly created)
 227 + */
 228 +typedef int (*ext_prepare_callback)(struct inode *, struct ext4_ext_path *,
 229 +                                   struct ext4_ext_cache *,
 230 +                                   struct ext4_extent *, void *);
 231 +
 232 +#define HAVE_EXT_PREPARE_CB_EXTENT
 233 +
 234 +#define EXT_CONTINUE   0
 235 +#define EXT_BREAK      1
 236 +#define EXT_REPEAT     2
 237 +
 238 +/*
 239   * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
 240   * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
 241   * MSB of ee_len field in the extent datastructure to signify if this
 242 @@ -219,6 +235,8 @@ extern int ext4_ext_try_to_merge(struct
 243                                  struct ext4_extent *);
 244  extern unsigned int ext4_ext_check_overlap(struct inode *, struct ext4_extent *, struct ext4_ext_path *);
 245  extern int ext4_ext_insert_extent(handle_t *, struct inode *, struct ext4_ext_path *, struct ext4_extent *);
 246 +extern int ext4_ext_walk_space(struct inode *, ext4_lblk_t, ext4_lblk_t,
 247 +                              ext_prepare_callback, void *);
 248  extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
 249                                                         struct ext4_ext_path *);
 250  extern int ext4_ext_search_left(struct inode *, struct ext4_ext_path *,
 251 Index: linux-2.6.27.21-0.1/fs/ext4/extents.c
 252 ===================================================================
 253 --- linux-2.6.27.21-0.1.orig/fs/ext4/extents.c
 254 +++ linux-2.6.27.21-0.1/fs/ext4/extents.c
 255 @@ -42,7 +42,7 @@
 256  #include <asm/uaccess.h>
 257  #include "ext4_jbd2.h"
 258  #include "ext4_extents.h"
 259 -
 260 +#include "fiemap.h"
 261
 262  /*
 263   * ext_pblock:
 264 @@ -1622,6 +1622,113 @@ cleanup:
 265         return err;
 266  }
 267
 268 +int ext4_ext_walk_space(struct inode *inode, ext4_lblk_t block,
 269 +                       ext4_lblk_t num, ext_prepare_callback func,
 270 +                       void *cbdata)
 271 +{
 272 +       struct ext4_ext_path *path = NULL;
 273 +       struct ext4_ext_cache cbex;
 274 +       struct ext4_extent *ex;
 275 +       ext4_lblk_t next, start = 0, end = 0;
 276 +       ext4_lblk_t last = block + num;
 277 +       int depth, exists, err = 0;
 278 +
 279 +       BUG_ON(func == NULL);
 280 +       BUG_ON(inode == NULL);
 281 +
 282 +       while (block < last && block != EXT_MAX_BLOCK) {
 283 +               num = last - block;
 284 +               /* find extent for this block */
 285 +               path = ext4_ext_find_extent(inode, block, path);
 286 +               if (IS_ERR(path)) {
 287 +                       err = PTR_ERR(path);
 288 +                       path = NULL;
 289 +                       break;
 290 +               }
 291 +
 292 +               depth = ext_depth(inode);
 293 +               BUG_ON(path[depth].p_hdr == NULL);
 294 +               ex = path[depth].p_ext;
 295 +               next = ext4_ext_next_allocated_block(path);
 296 +
 297 +               exists = 0;
 298 +               if (!ex) {
 299 +                       /* there is no extent yet, so try to allocate
 300 +                        * all requested space */
 301 +                       start = block;
 302 +                       end = block + num;
 303 +               } else if (le32_to_cpu(ex->ee_block) > block) {
 304 +                       /* need to allocate space before found extent */
 305 +                       start = block;
 306 +                       end = le32_to_cpu(ex->ee_block);
 307 +                       if (block + num < end)
 308 +                               end = block + num;
 309 +               } else if (block >= le32_to_cpu(ex->ee_block)
 310 +                                       + ext4_ext_get_actual_len(ex)) {
 311 +                       /* need to allocate space after found extent */
 312 +                       start = block;
 313 +                       end = block + num;
 314 +                       if (end >= next)
 315 +                               end = next;
 316 +               } else if (block >= le32_to_cpu(ex->ee_block)) {
 317 +                       /*
 318 +                        * some part of requested space is covered
 319 +                        * by found extent
 320 +                        */
 321 +                       start = block;
 322 +                       end = le32_to_cpu(ex->ee_block)
 323 +                               + ext4_ext_get_actual_len(ex);
 324 +                       if (block + num < end)
 325 +                               end = block + num;
 326 +                       exists = 1;
 327 +               } else {
 328 +                       BUG();
 329 +               }
 330 +               BUG_ON(end <= start);
 331 +
 332 +               if (!exists) {
 333 +                       cbex.ec_block = start;
 334 +                       cbex.ec_len = end - start;
 335 +                       cbex.ec_start = 0;
 336 +                       cbex.ec_type = EXT4_EXT_CACHE_GAP;
 337 +               } else {
 338 +                       cbex.ec_block = le32_to_cpu(ex->ee_block);
 339 +                       cbex.ec_len = ext4_ext_get_actual_len(ex);
 340 +                       cbex.ec_start = ext_pblock(ex);
 341 +                       cbex.ec_type = EXT4_EXT_CACHE_EXTENT;
 342 +               }
 343 +
 344 +               BUG_ON(cbex.ec_len == 0);
 345 +               err = func(inode, path, &cbex, ex, cbdata);
 346 +               ext4_ext_drop_refs(path);
 347 +
 348 +               if (err < 0)
 349 +                       break;
 350 +
 351 +               if (err == EXT_REPEAT)
 352 +                       continue;
 353 +               else if (err == EXT_BREAK) {
 354 +                       err = 0;
 355 +                       break;
 356 +               }
 357 +
 358 +               if (ext_depth(inode) != depth) {
 359 +                       /* depth was changed. we have to realloc path */
 360 +                       kfree(path);
 361 +                       path = NULL;
 362 +               }
 363 +
 364 +               block = cbex.ec_block + cbex.ec_len;
 365 +       }
 366 +
 367 +       if (path) {
 368 +               ext4_ext_drop_refs(path);
 369 +               kfree(path);
 370 +       }
 371 +
 372 +       return err;
 373 +}
 374 +
 375  static void
 376  ext4_ext_put_in_cache(struct inode *inode, ext4_lblk_t block,
 377                         __u32 len, ext4_fsblk_t start, int type)
 378 @@ -2966,3 +3073,100 @@ retry:
 379         mutex_unlock(&inode->i_mutex);
 380         return ret > 0 ? ret2 : ret;
 381  }
 382 +
 383 +/*
 384 + * Callback function called for each extent to gather FIEMAP information.
 385 + */
 386 +int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
 387 +                      struct ext4_ext_cache *newex, struct ext4_extent *ex,
 388 +                      void *data)
 389 +{
 390 +       struct fiemap_extent_info *fieinfo = data;
 391 +       unsigned long blksize_bits = inode->i_sb->s_blocksize_bits;
 392 +       __u64   logical;
 393 +       __u64   physical;
 394 +       __u64   length;
 395 +       __u32   flags = 0;
 396 +       int     error;
 397 +
 398 +       logical =  (__u64)newex->ec_block << blksize_bits;
 399 +
 400 +       if (newex->ec_type == EXT4_EXT_CACHE_GAP) {
 401 +               pgoff_t offset;
 402 +               struct page *page;
 403 +               struct buffer_head *bh = NULL;
 404 +
 405 +               offset = logical >> PAGE_SHIFT;
 406 +               page = find_get_page(inode->i_mapping, offset);
 407 +               if (!page || !page_has_buffers(page))
 408 +                       return EXT_CONTINUE;
 409 +
 410 +               bh = page_buffers(page);
 411 +
 412 +               if (!bh)
 413 +                       return EXT_CONTINUE;
 414 +
 415 +               if (buffer_delay(bh)) {
 416 +                       flags |= FIEMAP_EXTENT_DELALLOC;
 417 +                       page_cache_release(page);
 418 +               } else {
 419 +                       page_cache_release(page);
 420 +                       return EXT_CONTINUE;
 421 +               }
 422 +       }
 423 +
 424 +       physical = (__u64)newex->ec_start << blksize_bits;
 425 +       length =   (__u64)newex->ec_len << blksize_bits;
 426 +
 427 +       if (ex && ext4_ext_is_uninitialized(ex))
 428 +               flags |= FIEMAP_EXTENT_UNWRITTEN;
 429 +
 430 +       /*
 431 +        * If this extent reaches EXT_MAX_BLOCK, it must be last.
 432 +        *
 433 +        * Or if ext4_ext_next_allocated_block is EXT_MAX_BLOCK,
 434 +        * this indicates no more allocated blocks.
 435 +        *
 436 +        * XXX this might miss a single-block extent at EXT_MAX_BLOCK
 437 +        */
 438 +       if (logical + length - 1 == EXT_MAX_BLOCK ||
 439 +           ext4_ext_next_allocated_block(path) == EXT_MAX_BLOCK)
 440 +               flags |= FIEMAP_EXTENT_LAST;
 441 +
 442 +       error = fiemap_fill_next_extent(fieinfo, logical, physical,
 443 +                                       length, flags, inode->i_sb->s_dev);
 444 +       if (error < 0)
 445 +               return error;
 446 +       if (error == 1)
 447 +               return EXT_BREAK;
 448 +
 449 +       return EXT_CONTINUE;
 450 +}
 451 +
 452 +int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 453 +               __u64 start, __u64 len)
 454 +{
 455 +       ext4_fsblk_t start_blk;
 456 +       ext4_fsblk_t len_blks;
 457 +       int error = 0;
 458 +
 459 +       if (!(EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL))
 460 +               return -EOPNOTSUPP;
 461 +
 462 +       if (fiemap_check_flags(fieinfo, EXT4_FIEMAP_FLAGS_COMPAT))
 463 +               return -EBADR;
 464 +
 465 +       start_blk = start >> inode->i_sb->s_blocksize_bits;
 466 +       len_blks = (len + inode->i_sb->s_blocksize - 1) >> inode->i_sb->s_blocksize_bits;
 467 +
 468 +       /*
 469 +        * Walk the extent tree gathering extent information.
 470 +        * ext4_ext_fiemap_cb will push extents back to user.
 471 +        */
 472 +       down_write(&EXT4_I(inode)->i_data_sem);
 473 +       error = ext4_ext_walk_space(inode, start_blk, len_blks,
 474 +                                 ext4_ext_fiemap_cb, fieinfo);
 475 +       up_write(&EXT4_I(inode)->i_data_sem);
 476 +
 477 +       return error;
 478 +}
 479 Index: linux-2.6.27.21-0.1/fs/ext4/fiemap.h
 480 ===================================================================
 481 --- /dev/null
 482 +++ linux-2.6.27.21-0.1/fs/ext4/fiemap.h
 483 @@ -0,0 +1,85 @@
 484 +/*
 485 + * FIEMAP ioctl infrastructure.
 486 + *
 487 + * Copyright 2008 Sun Microsystems, Inc
 488 + *
 489 + * Author: Kalpak Shah <kalpak.shah@sun.com>
 490 + *      Andreas Dilger <adilger@sun.com>
 491 + */
 492 +
 493 +#ifndef _LINUX_EXT4_FIEMAP_H
 494 +#define _LINUX_EXT4_FIEMAP_H
 495 +
 496 +struct fiemap_extent {
 497 +       __u64 fe_logical;  /* logical offset in bytes for the start of
 498 +                           * the extent from the beginning of the file */
 499 +       __u64 fe_physical; /* physical offset in bytes for the start
 500 +                           * of the extent from the beginning of the disk */
 501 +       __u64 fe_length;   /* length in bytes for this extent */
 502 +       __u64 fe_reserved64[2];
 503 +       __u32 fe_flags;    /* FIEMAP_EXTENT_* flags for this extent */
 504 +       __u32 fe_device;   /* device number for this extent */
 505 +       __u32 fe_reserved[2];
 506 +};
 507 +
 508 +struct fiemap {
 509 +       __u64 fm_start;  /* logical offset (inclusive) at
 510 +                                * which to start mapping (in) */
 511 +       __u64 fm_length;        /* logical length of mapping which
 512 +                                * userspace wants (in) */
 513 +       __u32 fm_flags;  /* FIEMAP_FLAG_* flags for request (in/out) */
 514 +       __u32 fm_mapped_extents;/* number of extents that were mapped (out) */
 515 +       __u32 fm_extent_count;  /* size of fm_extents array (in) */
 516 +       __u32 fm_reserved;
 517 +       struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
 518 +};
 519 +
 520 +/*
 521 + * FIEMAP helper definition.
 522 + */
 523 +struct fiemap_extent_info {
 524 +       unsigned int    fi_flags;               /* Flags as passed from user */
 525 +       unsigned int    fi_extents_mapped;      /* Number of mapped extents */
 526 +       unsigned int    fi_extents_max;         /* Size of fiemap_extent array*/
 527 +       struct fiemap_extent *fi_extents_start; /* Start of fiemap_extent array */
 528 +};
 529 +
 530 +int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags);
 531 +int fiemap_fill_next_extent(struct fiemap_extent_info *info, u64 logical,
 532 +                           u64 phys, u64 len, u32 flags, u32 lun);
 533 +
 534 +#define        FIEMAP_MAX_OFFSET       (~0ULL)
 535 +
 536 +#define        FIEMAP_FLAG_SYNC        0x00000001 /* sync file data before map */
 537 +#define        FIEMAP_FLAG_XATTR       0x00000002 /* map extended attribute tree */
 538 +
 539 +/* ldiskfs only supports FLAG_SYNC flag currently */
 540 +#define FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
 541 +
 542 +#define FIEMAP_EXTENT_LAST             0x00000001 /* Last extent in file. */
 543 +#define FIEMAP_EXTENT_UNKNOWN          0x00000002 /* Data location unknown. */
 544 +#define FIEMAP_EXTENT_DELALLOC         0x00000004 /* Location still pending.
 545 +                                                   * Sets EXTENT_UNKNOWN. */
 546 +#define FIEMAP_EXTENT_ENCODED          0x00000008 /* Data can not be read
 547 +                                                   * while fs is unmounted */
 548 +#define FIEMAP_EXTENT_DATA_ENCRYPTED   0x00000080 /* Data is encrypted by fs.
 549 +                                                   * Sets EXTENT_NO_DIRECT. */
 550 +#define FIEMAP_EXTENT_NOT_ALIGNED      0x00000100 /* Extent offsets may not be
 551 +                                                   * block aligned. */
 552 +#define FIEMAP_EXTENT_DATA_INLINE      0x00000200 /* Data mixed with metadata.
 553 +                                                   * Sets EXTENT_NOT_ALIGNED.*/
 554 +#define FIEMAP_EXTENT_DATA_TAIL                0x00000400 /* Multiple files in block.
 555 +                                                   * Sets EXTENT_NOT_ALIGNED.*/
 556 +#define FIEMAP_EXTENT_UNWRITTEN                0x00000800 /* Space allocated, but
 557 +                                                   * no data (i.e. zero). */
 558 +#define FIEMAP_EXTENT_MERGED           0x00001000 /* File does not natively
 559 +                                                   * support extents. Result
 560 +                                                   * merged for efficiency. */
 561 +
 562 +/* Lustre specific flags - use a high bit, don't conflict with upstream flag */
 563 +#define FIEMAP_EXTENT_NO_DIRECT                0x40000000 /* Data mapping undefined */
 564 +#define FIEMAP_EXTENT_NET              0x80000000 /* Data stored remotely.
 565 +                                                   * Sets NO_DIRECT flag */
 566 +
 567 +#endif /* _LINUX_EXT4_FIEMAP_H */
 568 +