1 A large part of this code is from the generic VFS code in fs/ioctl.c in the
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
9 #include <linux/time.h>
10 #include <asm/uaccess.h>
11 #include <linux/namei.h>
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))
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
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.
30 + * Returns 0 on success, -errno on error, 1 if this was the last
31 + * extent that will fit in user array.
33 +#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
34 +#define SET_NO_DIRECT_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED \
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)
41 + struct fiemap_extent extent = { 0 };
42 + struct fiemap_extent *dest = fieinfo->fi_extents_start;
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;
50 + if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
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;
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);
68 + dest += fieinfo->fi_extents_mapped;
69 + if (copy_to_user(dest, &extent, sizeof(extent)))
72 + fieinfo->fi_extents_mapped++;
73 + if (fieinfo->fi_extents_mapped == fieinfo->fi_extents_max)
76 + return (flags & FIEMAP_EXTENT_LAST) ? 1 : 0;
79 +static int fiemap_check_ranges(struct super_block *sb,
80 + u64 start, u64 len, u64 *new_len)
87 + if (start > sb->s_maxbytes)
91 + * Shrink request scope to what the fs can actually handle.
93 + if ((len > sb->s_maxbytes) ||
94 + (sb->s_maxbytes - len) < start)
95 + *new_len = sb->s_maxbytes - start;
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
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.
112 + * Returns 0 on success, -EBADR on bad flags.
114 +int fiemap_check_flags(struct fiemap_extent_info *fieinfo, u32 fs_flags)
116 + u32 incompat_flags;
118 + incompat_flags = fieinfo->fi_flags & ~(FIEMAP_FLAGS_COMPAT & fs_flags);
119 + if (incompat_flags) {
120 + fieinfo->fi_flags = incompat_flags;
127 +int ioctl_fiemap(struct inode *inode, struct file *filp, unsigned long arg)
129 + struct fiemap fiemap;
131 + struct fiemap_extent_info fieinfo = {0, };
132 + struct super_block *sb = inode->i_sb;
135 + if (copy_from_user(&fiemap, (struct fiemap __user *) arg,
136 + sizeof(struct fiemap)))
139 + if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
142 + error = fiemap_check_ranges(sb, fiemap.fm_start, fiemap.fm_length,
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));
151 + if (fiemap.fm_extent_count != 0 &&
152 + !access_ok(VERIFY_WRITE, (void *)arg,
153 + offsetof(typeof(fiemap), fm_extents[fiemap.fm_extent_count])))
156 + if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
157 + filemap_write_and_wait(inode->i_mapping);
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)))
168 int ext3_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
170 @@ -262,7 +416,9 @@ flags_err:
175 + case EXT3_IOC_FIEMAP: {
176 + return ioctl_fiemap(inode, filp, arg);
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)
199 -#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
200 -#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
202 +/* FIEMAP flags supported by ext3 */
203 +#define EXT3_FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC)
207 @@ -997,6 +1001,9 @@ extern int ext3_writepage_trans_blocks(s
209 extern int ext3_ioctl (struct inode *, struct file *, unsigned int,
211 +struct fiemap_extent_info;
212 +extern int ext3_fiemap(struct inode *, struct fiemap_extent_info *, __u64,
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 {
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 *);
229 +#define HAVE_EXT_PREPARE_CB_EXTENT
231 #define EXT_CONTINUE 0
233 @@ -180,6 +183,25 @@ typedef int (*ext_prepare_callback)(stru
234 #define EXT_MAX_BLOCK 0xffffffff
235 #define EXT_UNSET_BLOCK 1
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.
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).
254 +#define EXT_INIT_MAX_LEN (1UL << 15)
255 +#define EXT_UNINIT_MAX_LEN (EXT_INIT_MAX_LEN - 1)
257 #define EXT_FIRST_EXTENT(__hdr__) \
258 ((struct ext3_extent *) (((char *) (__hdr__)) + \
259 @@ -243,6 +265,12 @@ struct ext3_extent_tree_stats {
263 +static inline int ext3_ext_is_uninitialized(struct ext3_extent *ext)
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);
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
277 #include <linux/string.h>
278 #include <linux/slab.h>
279 #include <linux/ext3_extents.h>
281 #include <asm/uaccess.h>
284 @@ -1488,7 +1489,7 @@ int ext3_ext_walk_space(struct ext3_exte
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);
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);
300 + * Callback function called for each extent to gather FIEMAP information.
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)
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;
315 + logical = (__u64)newex->ec_block << blksize_bits;
317 + if (newex->ec_type == EXT3_EXT_CACHE_GAP) {
320 + struct buffer_head *bh = NULL;
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;
327 + bh = page_buffers(page);
330 + return EXT_CONTINUE;
332 + if (buffer_delay(bh)) {
333 + flags |= FIEMAP_EXTENT_DELALLOC;
334 + page_cache_release(page);
336 + page_cache_release(page);
337 + return EXT_CONTINUE;
341 + physical = (__u64)newex->ec_start << blksize_bits;
342 + length = (__u64)newex->ec_len << blksize_bits;
344 + if (ex && ext3_ext_is_uninitialized(ex))
345 + flags |= FIEMAP_EXTENT_UNWRITTEN;
348 + * If this extent reaches EXT_MAX_BLOCK, it must be last.
350 + * Or if ext3_ext_next_allocated_block is EXT_MAX_BLOCK,
351 + * this indicates no more allocated blocks.
353 + * XXX this might miss a single-block extent at EXT_MAX_BLOCK
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;
359 + error = fiemap_fill_next_extent(fieinfo, logical, physical,
360 + length, flags, inode->i_sb->s_dev);
366 + return EXT_CONTINUE;
369 +int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
370 + __u64 start, __u64 len)
372 + struct ext3_extents_tree tree;
373 + unsigned long start_blk;
374 + unsigned long len_blks;
377 + if (!(EXT3_I(inode)->i_flags & EXT3_EXTENTS_FL))
378 + return -EOPNOTSUPP;
380 + if (fiemap_check_flags(fieinfo, EXT3_FIEMAP_FLAGS_COMPAT))
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;
386 + ext3_init_tree_desc(&tree, inode);
387 + tree.private = fieinfo;
390 + * Walk the extent tree gathering extent information.
391 + * ext3_ext_fiemap_cb will push extents back to user.
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);
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 ===================================================================
407 +++ linux-2.6.16.60-0.37/fs/ext3/fiemap.h
410 + * FIEMAP ioctl infrastructure.
412 + * Copyright 2008 Sun Microsystems, Inc.
414 + * Author: Kalpak Shah <kalpak.shah@sun.com>
415 + * Andreas Dilger <adilger@sun.com>
418 +#ifndef _LINUX_EXT3_FIEMAP_H
419 +#define _LINUX_EXT3_FIEMAP_H
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];
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) */
442 + struct fiemap_extent fm_extents[0]; /* array of mapped extents (out) */
446 + * FIEMAP helper definition.
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 */
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);
459 +#define FIEMAP_MAX_OFFSET (~0ULL)
461 +#define FIEMAP_FLAG_SYNC 0x00000001 /* sync file data before map */
462 +#define FIEMAP_FLAG_XATTR 0x00000002 /* map extended attribute tree */
464 +/* ldiskfs only supports FLAG_SYNC flag currently */
465 +#define FIEMAP_FLAGS_COMPAT (FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR)
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. */
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 */
492 +#endif /* _LINUX_EXT3_FIEMAP_H */