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

   1 Index: linux-2.6.16.46-0.14/fs/ext3/ioctl.c
   2 ===================================================================
   3 --- linux-2.6.16.46-0.14.orig/fs/ext3/ioctl.c
   4 +++ linux-2.6.16.46-0.14/fs/ext3/ioctl.c
   5 @@ -15,7 +15,7 @@
   6  #include <linux/time.h>
   7  #include <asm/uaccess.h>
   8  #include <linux/namei.h>
   9 -
  10 +#include "fiemap.h"
  11
  12  int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
  13                 unsigned long arg)
  14 @@ -266,6 +266,9 @@ flags_err:
  15
  16                 return err;
  17         }
  18 +       case EXT3_IOC_FIEMAP: {
  19 +               return ext3_fiemap(inode, filp, cmd, arg);
  20 +       }
  21
  22
  23         default:
  24 Index: linux-2.6.16.46-0.14/include/linux/ext3_fs.h
  25 ===================================================================
  26 --- linux-2.6.16.46-0.14.orig/include/linux/ext3_fs.h
  27 +++ linux-2.6.16.46-0.14/include/linux/ext3_fs.h
  28 @@ -252,7 +252,6 @@ struct ext3_new_group_data {
  29         __u32 free_blocks_count;
  30  };
  31
  32 -
  33  /*
  34   * ioctl commands
  35   */
  36 @@ -272,6 +271,7 @@ struct ext3_new_group_data {
  37  #define EXT3_IOC_GET_EXTENTS           _IOR('f', 7, long)
  38  #define EXT3_IOC_GET_TREE_DEPTH                _IOR('f', 8, long)
  39  #define EXT3_IOC_GET_TREE_STATS                _IOR('f', 9, long)
  40 +#define        EXT3_IOC_FIEMAP                 _IOWR('f', 10, struct fiemap)
  41
  42  /*
  43   *  Mount options
  44 @@ -853,6 +853,8 @@ static inline struct timespec ext3_curre
  45         return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
  46                 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
  47  }
  48 +extern int ext3_fiemap(struct inode *, struct file *, unsigned int,
  49 +                      unsigned long);
  50
  51  /*
  52   * This structure is stuffed into the struct file's private_data field
  53 Index: linux-2.6.16.46-0.14/include/linux/ext3_extents.h
  54 ===================================================================
  55 --- linux-2.6.16.46-0.14.orig/include/linux/ext3_extents.h
  56 +++ linux-2.6.16.46-0.14/include/linux/ext3_extents.h
  57 @@ -170,7 +170,8 @@ struct ext3_extents_helpers {
  58   */
  59  typedef int (*ext_prepare_callback)(struct ext3_extents_tree *,
  60                                     struct ext3_ext_path *,
  61 -                                   struct ext3_ext_cache *);
  62 +                                   struct ext3_ext_cache *,
  63 +                                   struct ext3_extent *);
  64
  65  #define EXT_CONTINUE   0
  66  #define EXT_BREAK      1
  67 @@ -179,6 +180,25 @@ typedef int (*ext_prepare_callback)(stru
  68
  69  #define EXT_MAX_BLOCK  0xffffffff
  70
  71 +/*
  72 + * EXT_INIT_MAX_LEN is the maximum number of blocks we can have in an
  73 + * initialized extent. This is 2^15 and not (2^16 - 1), since we use the
  74 + * MSB of ee_len field in the extent datastructure to signify if this
  75 + * particular extent is an initialized extent or an uninitialized (i.e.
  76 + * preallocated).
  77 + * EXT_UNINIT_MAX_LEN is the maximum number of blocks we can have in an
  78 + * uninitialized extent.
  79 + * If ee_len is <= 0x8000, it is an initialized extent. Otherwise, it is an
  80 + * uninitialized one. In other words, if MSB of ee_len is set, it is an
  81 + * uninitialized extent with only one special scenario when ee_len = 0x8000.
  82 + * In this case we can not have an uninitialized extent of zero length and
  83 + * thus we make it as a special case of initialized extent with 0x8000 length.
  84 + * This way we get better extent-to-group alignment for initialized extents.
  85 + * Hence, the maximum number of blocks we can have in an *initialized*
  86 + * extent is 2^15 (32768) and in an *uninitialized* extent is 2^15-1 (32767).
  87 + */
  88 +#define        EXT_INIT_MAX_LEN        (1UL << 15)
  89 +#define        EXT_UNINIT_MAX_LEN      (EXT_INIT_MAX_LEN - 1)
  90
  91  #define EXT_FIRST_EXTENT(__hdr__) \
  92         ((struct ext3_extent *) (((char *) (__hdr__)) +         \
  93 @@ -260,5 +280,10 @@ ext3_ext_invalidate_cache(struct ext3_ex
  94                 tree->cex->ec_type = EXT3_EXT_CACHE_NO;
  95  }
  96
  97 +static inline int ext3_ext_is_uninitialized(struct ext3_extent *ext)
  98 +{
  99 +        /* Extent with ee_len of 0x8000 is treated as an initialized extent */
 100 +        return (le16_to_cpu(ext->ee_len) > EXT_INIT_MAX_LEN);
 101 +}
 102
 103  #endif /* _LINUX_EXT3_EXTENTS */
 104 Index: linux-2.6.16.46-0.14/fs/ext3/extents.c
 105 ===================================================================
 106 --- linux-2.6.16.46-0.14.orig/fs/ext3/extents.c
 107 +++ linux-2.6.16.46-0.14/fs/ext3/extents.c
 108 @@ -42,7 +42,7 @@
 109  #include <linux/slab.h>
 110  #include <linux/ext3_extents.h>
 111  #include <asm/uaccess.h>
 112 -
 113 +#include "fiemap.h"
 114
 115  static int __ext3_ext_check_header(const char *function, struct inode *inode,
 116                                 struct ext3_extent_header *eh, int depth,
 117 @@ -1484,7 +1484,7 @@ int ext3_ext_walk_space(struct ext3_exte
 118
 119                 EXT_ASSERT(cbex.ec_len > 0);
 120                 EXT_ASSERT(path[depth].p_hdr);
 121 -               err = func(tree, path, &cbex);
 122 +               err = func(tree, path, &cbex, ex);
 123                 ext3_ext_drop_refs(path);
 124
 125                 if (err < 0)
 126 @@ -2499,7 +2499,8 @@ int ext3_ext_calc_blockmap_metadata(stru
 127  static int
 128  ext3_ext_store_extent_cb(struct ext3_extents_tree *tree,
 129                          struct ext3_ext_path *path,
 130 -                        struct ext3_ext_cache *newex)
 131 +                        struct ext3_ext_cache *newex,
 132 +                        struct ext3_extent *extent)
 133  {
 134         struct ext3_extent_buf *buf = (struct ext3_extent_buf *) tree->private;
 135
 136 @@ -2524,7 +2525,7 @@ ext3_ext_store_extent_cb(struct ext3_ext
 137  static int
 138  ext3_ext_collect_stats_cb(struct ext3_extents_tree *tree,
 139                           struct ext3_ext_path *path,
 140 -                         struct ext3_ext_cache *ex)
 141 +                         struct ext3_ext_cache *ex, struct ext3_extent *extent)
 142  {
 143         struct ext3_extent_tree_stats *buf =
 144                 (struct ext3_extent_tree_stats *) tree->private;
 145 @@ -2591,6 +2592,149 @@ int ext3_ext_ioctl(struct inode *inode,
 146         return err;
 147  }
 148
 149 +struct fiemap_internal {
 150 +       struct fiemap           *fiemap_s;
 151 +       struct fiemap_extent    fm_extent;
 152 +       size_t                  tot_mapping_len;
 153 +       char                    *cur_ext_ptr;
 154 +       int                     current_extent;
 155 +       int                     err;
 156 +};
 157 +
 158 +/*
 159 + * Callback function called for each extent to gather fiemap information.
 160 + */
 161 +int ext3_ext_fiemap_cb(struct ext3_extents_tree *tree,
 162 +                      struct ext3_ext_path *path, struct ext3_ext_cache *newex,
 163 +                      struct ext3_extent *ex)
 164 +{
 165 +       struct fiemap_internal *fiemap_i = (struct fiemap_internal *)tree->private;
 166 +       struct fiemap *fiemap_s = fiemap_i->fiemap_s;
 167 +       struct fiemap_extent *fm_extent = &fiemap_i->fm_extent;
 168 +       int current_extent = fiemap_i->current_extent;
 169 +       struct inode *inode = tree->inode;
 170 +       unsigned long blksize_bits = inode->i_sb->s_blocksize_bits;
 171 +
 172 +       /*
 173 +        * ext3_ext_walk_space returns a hole for extents that have not been
 174 +        * allocated yet.
 175 +        */
 176 +       if (((u64)(newex->ec_block + newex->ec_len) << blksize_bits >=
 177 +            inode->i_size) && !ext3_ext_is_uninitialized(ex) &&
 178 +           newex->ec_type == EXT3_EXT_CACHE_GAP)
 179 +               return EXT_BREAK;
 180 +
 181 +       /*
 182 +        * We only need to return number of extents.
 183 +        */
 184 +       if (fiemap_s->fm_flags & FIEMAP_FLAG_NUM_EXTENTS)
 185 +               goto count_extents;
 186 +
 187 +       if (current_extent >= fiemap_s->fm_extent_count)
 188 +               return EXT_BREAK;
 189 +
 190 +       memset(fm_extent, 0, sizeof(*fm_extent));
 191 +       fm_extent->fe_offset = (__u64)newex->ec_start << blksize_bits;
 192 +       fm_extent->fe_length = (__u64)newex->ec_len << blksize_bits;
 193 +       fiemap_i->tot_mapping_len += fm_extent->fe_length;
 194 +
 195 +       if (newex->ec_type == EXT3_EXT_CACHE_GAP)
 196 +               fm_extent->fe_flags |= FIEMAP_EXTENT_HOLE;
 197 +
 198 +       if (ext3_ext_is_uninitialized(ex))
 199 +               fm_extent->fe_flags |= (FIEMAP_EXTENT_DELALLOC |
 200 +                                       FIEMAP_EXTENT_UNMAPPED);
 201 +
 202 +       /*
 203 +        * Mark this fiemap_extent as FIEMAP_EXTENT_EOF if it's past the end
 204 +        * of file.
 205 +        */
 206 +       if ((u64)(newex->ec_block + newex->ec_len) << blksize_bits >=
 207 +                                                               inode->i_size)
 208 +               fm_extent->fe_flags |= FIEMAP_EXTENT_EOF;
 209 +
 210 +       if (!copy_to_user(fiemap_i->cur_ext_ptr, fm_extent,
 211 +                         sizeof(struct fiemap_extent))) {
 212 +               fiemap_i->cur_ext_ptr += sizeof(struct fiemap_extent);
 213 +       } else {
 214 +               fiemap_i->err = -EFAULT;
 215 +               return EXT_BREAK;
 216 +       }
 217 +
 218 +count_extents:
 219 +       fiemap_i->current_extent++;
 220 +
 221 +       /*
 222 +        * Stop if we are beyond requested mapping size but return complete last
 223 +        * extent.
 224 +        */
 225 +       if ((u64)(newex->ec_block + newex->ec_len) << blksize_bits >=
 226 +           fiemap_s->fm_length)
 227 +               return EXT_BREAK;
 228 +
 229 +       return EXT_CONTINUE;
 230 +}
 231 +
 232 +int ext3_fiemap(struct inode *inode, struct file *filp, unsigned int cmd,
 233 +               unsigned long arg)
 234 +{
 235 +       struct fiemap *fiemap_s;
 236 +       struct fiemap_internal fiemap_i;
 237 +       struct fiemap_extent *last_extent;
 238 +       unsigned long start_blk;
 239 +       struct ext3_extents_tree tree;
 240 +       int err = 0;
 241 +
 242 +       if (!(EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL))
 243 +               return -EOPNOTSUPP;
 244 +
 245 +       fiemap_s = kmalloc(sizeof(*fiemap_s), GFP_KERNEL);
 246 +       if (fiemap_s == NULL)
 247 +               return -ENOMEM;
 248 +       if (copy_from_user(fiemap_s, (struct fiemap __user *)arg,
 249 +                          sizeof(*fiemap_s)))
 250 +               return -EFAULT;
 251 +
 252 +       if (fiemap_s->fm_flags & FIEMAP_FLAG_INCOMPAT)
 253 +               return -EOPNOTSUPP;
 254 +
 255 +       if (fiemap_s->fm_flags & FIEMAP_FLAG_SYNC)
 256 +               ext3_sync_file(filp, filp->f_dentry, 1);
 257 +
 258 +       start_blk = (fiemap_s->fm_start + inode->i_sb->s_blocksize - 1) >>
 259 +                                               inode->i_sb->s_blocksize_bits;
 260 +       fiemap_i.fiemap_s = fiemap_s;
 261 +       fiemap_i.tot_mapping_len = 0;
 262 +       fiemap_i.cur_ext_ptr = (char *)(arg + sizeof(*fiemap_s));
 263 +       fiemap_i.current_extent = 0;
 264 +       fiemap_i.err = 0;
 265 +       ext3_init_tree_desc(&tree, inode);
 266 +       tree.private = &fiemap_i;
 267 +
 268 +       /*
 269 +        * Walk the extent tree gathering extent information
 270 +        */
 271 +       down(&EXT3_I(inode)->truncate_sem);
 272 +       err = ext3_ext_walk_space(&tree, start_blk , EXT_MAX_BLOCK - start_blk,
 273 +                                 (void *)ext3_ext_fiemap_cb);
 274 +       up(&EXT3_I(inode)->truncate_sem);
 275 +       if (err)
 276 +               return err;
 277 +
 278 +       fiemap_s->fm_extent_count = fiemap_i.current_extent;
 279 +       fiemap_s->fm_length = fiemap_i.tot_mapping_len;
 280 +       if (fiemap_i.current_extent != 0 &&
 281 +           !(fiemap_s->fm_flags & FIEMAP_FLAG_NUM_EXTENTS)) {
 282 +               last_extent = &fiemap_i.fm_extent;
 283 +               last_extent->fe_flags |= FIEMAP_EXTENT_LAST;
 284 +       }
 285 +       err = copy_to_user((void *)arg, fiemap_s, sizeof(*fiemap_s));
 286 +
 287 +       return err;
 288 +}
 289 +
 290 +
 291 +
 292  EXPORT_SYMBOL(ext3_init_tree_desc);
 293  EXPORT_SYMBOL(ext3_mark_inode_dirty);
 294  EXPORT_SYMBOL(ext3_ext_invalidate_cache);
 295 Index: linux-2.6.16.46-0.14/fs/ext3/fiemap.h
 296 ===================================================================
 297 --- /dev/null
 298 +++ linux-2.6.16.46-0.14/fs/ext3/fiemap.h
 299 @@ -0,0 +1,49 @@
 300 +/*
 301 + * linux/fs/ext3/fiemap.h
 302 + *
 303 + * Copyright (C) 2007 Cluster File Systems, Inc
 304 + *
 305 + * Author: Kalpak Shah <kalpak@clusterfs.com>
 306 + */
 307 +
 308 +#ifndef _LINUX_EXT3_FIEMAP_H
 309 +#define _LINUX_EXT3_FIEMAP_H
 310 +
 311 +struct fiemap_extent {
 312 +       __u64   fe_offset; /* offset in bytes for the start of the extent */
 313 +       __u64   fe_length; /* length in bytes for the extent */
 314 +       __u32   fe_flags;  /* returned FIEMAP_EXTENT_* flags for the extent */
 315 +       __u32   fe_lun;    /* logical device number for extent (starting at 0)*/
 316 +};
 317 +
 318 +/*
 319 + * fiemap is not ext3-specific and should be moved into fs.h eventually.
 320 + */
 321 +
 322 +struct fiemap {
 323 +       __u64   fm_start;        /* logical starting byte offset (in/out) */
 324 +       __u64   fm_length;       /* logical length of map (in/out) */
 325 +       __u32   fm_flags;        /* FIEMAP_FLAG_* flags for request (in/out) */
 326 +       __u32   fm_extent_count; /* number of extents in fm_extents (in/out) */
 327 +       __u64   fm_unused;
 328 +       struct fiemap_extent    fm_extents[0];
 329 +};
 330 +
 331 +#define        FIEMAP_FLAG_SYNC        0x00000001 /* sync file data before map */
 332 +#define        FIEMAP_FLAG_HSM_READ    0x00000002 /* get data from HSM before map */
 333 +#define        FIEMAP_FLAG_NUM_EXTENTS 0x00000004 /* return only number of extents */
 334 +#define        FIEMAP_FLAG_INCOMPAT    0xff000000 /* error for unknown flags in here */
 335 +
 336 +#define        FIEMAP_EXTENT_HOLE      0x00000001 /* has no data or space allocation */
 337 +#define        FIEMAP_EXTENT_UNWRITTEN 0x00000002 /* space allocated, but no data */
 338 +#define        FIEMAP_EXTENT_UNMAPPED  0x00000004 /* has data but no space allocation*/
 339 +#define        FIEMAP_EXTENT_ERROR     0x00000008 /* mapping error, errno in fe_start*/
 340 +#define        FIEMAP_EXTENT_NO_DIRECT 0x00000010 /* cannot access data directly */
 341 +#define        FIEMAP_EXTENT_LAST      0x00000020 /* last extent in the file */
 342 +#define        FIEMAP_EXTENT_DELALLOC  0x00000040 /* has data but not yet written,
 343 +                                           * must have EXTENT_UNKNOWN set */
 344 +#define        FIEMAP_EXTENT_SECONDARY 0x00000080 /* data (also) in secondary storage,
 345 +                                           * not in primary if EXTENT_UNKNOWN*/
 346 +#define        FIEMAP_EXTENT_EOF       0x00000100 /* if fm_start+fm_len is beyond EOF*/
 347 +
 348 +#endif /* _LINUX_EXT3_FIEMAP_H */