1 /* ext2.c - Second Extended filesystem */
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 2003,2004,2005,2007,2008,2009 Free Software Foundation, Inc.
6 * GRUB is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * GRUB is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
20 /* Magic value used to identify an ext2 filesystem. */
21 #define EXT2_MAGIC 0xEF53
22 /* Amount of indirect blocks in an inode. */
23 #define INDIRECT_BLOCKS 12
25 /* The good old revision and the default inode size. */
26 #define EXT2_GOOD_OLD_REVISION 0
27 #define EXT2_GOOD_OLD_INODE_SIZE 128
29 /* Filetype used in directory entry. */
30 #define FILETYPE_UNKNOWN 0
31 #define FILETYPE_REG 1
32 #define FILETYPE_DIRECTORY 2
33 #define FILETYPE_SYMLINK 7
35 /* Filetype information as used in inodes. */
36 #define FILETYPE_INO_MASK 0170000
37 #define FILETYPE_INO_REG 0100000
38 #define FILETYPE_INO_DIRECTORY 0040000
39 #define FILETYPE_INO_SYMLINK 0120000
42 #include <grub/file.h>
44 #include <grub/misc.h>
45 #include <grub/disk.h>
47 #include <grub/types.h>
48 #include <grub/fshelp.h>
50 GRUB_MOD_LICENSE ("GPLv3+");
52 /* Log2 size of ext2 block in 512 blocks. */
53 #define LOG2_EXT2_BLOCK_SIZE(data) \
54 (grub_le_to_cpu32 (data->sblock.log2_block_size) + 1)
56 /* Log2 size of ext2 block in bytes. */
57 #define LOG2_BLOCK_SIZE(data) \
58 (grub_le_to_cpu32 (data->sblock.log2_block_size) + 10)
60 /* The size of an ext2 block in bytes. */
61 #define EXT2_BLOCK_SIZE(data) (1U << LOG2_BLOCK_SIZE (data))
63 /* The revision level. */
64 #define EXT2_REVISION(data) grub_le_to_cpu32 (data->sblock.revision_level)
67 #define EXT2_INODE_SIZE(data) \
68 (data->sblock.revision_level \
69 == grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION) \
70 ? EXT2_GOOD_OLD_INODE_SIZE \
71 : grub_le_to_cpu16 (data->sblock.inode_size))
73 /* Superblock filesystem feature flags (RW compatible)
74 * A filesystem with any of these enabled can be read and written by a driver
75 * that does not understand them without causing metadata/data corruption. */
76 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
77 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
78 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
79 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
80 #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
81 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
82 /* Superblock filesystem feature flags (RO compatible)
83 * A filesystem with any of these enabled can be safely read by a driver that
84 * does not understand them, but should not be written to, usually because
85 * additional metadata is required. */
86 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
87 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
88 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
89 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
90 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
91 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
92 /* Superblock filesystem feature flags (back-incompatible)
93 * A filesystem with any of these enabled should not be attempted to be read
94 * by a driver that does not understand them, since they usually indicate
95 * metadata format changes that might confuse the reader. */
96 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
97 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
98 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
99 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Volume is journal device */
100 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
101 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* Extents used */
102 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
103 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
104 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
106 /* The set of back-incompatible features this driver DOES support. Add (OR)
107 * flags here as the related features are implemented into the driver. */
108 #define EXT2_DRIVER_SUPPORTED_INCOMPAT ( EXT2_FEATURE_INCOMPAT_FILETYPE \
109 | EXT4_FEATURE_INCOMPAT_EXTENTS \
110 | EXT4_FEATURE_INCOMPAT_FLEX_BG \
111 | EXT2_FEATURE_INCOMPAT_META_BG \
112 | EXT4_FEATURE_INCOMPAT_64BIT)
113 /* List of rationales for the ignored "incompatible" features:
114 * needs_recovery: Not really back-incompatible - was added as such to forbid
115 * ext2 drivers from mounting an ext3 volume with a dirty
116 * journal because they will ignore the journal, but the next
117 * ext3 driver to mount the volume will find the journal and
118 * replay it, potentially corrupting the metadata written by
119 * the ext2 drivers. Safe to ignore for this RO driver.
120 * mmp: Not really back-incompatible - was added as such to
121 * avoid multiple read-write mounts. Safe to ignore for this
124 #define EXT2_DRIVER_IGNORED_INCOMPAT ( EXT3_FEATURE_INCOMPAT_RECOVER \
125 | EXT4_FEATURE_INCOMPAT_MMP)
128 #define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U
130 #define EXT3_JOURNAL_DESCRIPTOR_BLOCK 1
131 #define EXT3_JOURNAL_COMMIT_BLOCK 2
132 #define EXT3_JOURNAL_SUPERBLOCK_V1 3
133 #define EXT3_JOURNAL_SUPERBLOCK_V2 4
134 #define EXT3_JOURNAL_REVOKE_BLOCK 5
136 #define EXT3_JOURNAL_FLAG_ESCAPE 1
137 #define EXT3_JOURNAL_FLAG_SAME_UUID 2
138 #define EXT3_JOURNAL_FLAG_DELETED 4
139 #define EXT3_JOURNAL_FLAG_LAST_TAG 8
141 #define EXT4_EXTENTS_FLAG 0x80000
143 /* The ext2 superblock. */
144 struct grub_ext2_sblock
146 grub_uint32_t total_inodes;
147 grub_uint32_t total_blocks;
148 grub_uint32_t reserved_blocks;
149 grub_uint32_t free_blocks;
150 grub_uint32_t free_inodes;
151 grub_uint32_t first_data_block;
152 grub_uint32_t log2_block_size;
153 grub_uint32_t log2_fragment_size;
154 grub_uint32_t blocks_per_group;
155 grub_uint32_t fragments_per_group;
156 grub_uint32_t inodes_per_group;
159 grub_uint16_t mnt_count;
160 grub_uint16_t max_mnt_count;
162 grub_uint16_t fs_state;
163 grub_uint16_t error_handling;
164 grub_uint16_t minor_revision_level;
165 grub_uint32_t lastcheck;
166 grub_uint32_t checkinterval;
167 grub_uint32_t creator_os;
168 grub_uint32_t revision_level;
169 grub_uint16_t uid_reserved;
170 grub_uint16_t gid_reserved;
171 grub_uint32_t first_inode;
172 grub_uint16_t inode_size;
173 grub_uint16_t block_group_number;
174 grub_uint32_t feature_compatibility;
175 grub_uint32_t feature_incompat;
176 grub_uint32_t feature_ro_compat;
177 grub_uint16_t uuid[8];
178 char volume_name[16];
179 char last_mounted_on[64];
180 grub_uint32_t compression_info;
181 grub_uint8_t prealloc_blocks;
182 grub_uint8_t prealloc_dir_blocks;
183 grub_uint16_t reserved_gdt_blocks;
184 grub_uint8_t journal_uuid[16];
185 grub_uint32_t journal_inum;
186 grub_uint32_t journal_dev;
187 grub_uint32_t last_orphan;
188 grub_uint32_t hash_seed[4];
189 grub_uint8_t def_hash_version;
190 grub_uint8_t jnl_backup_type;
191 grub_uint16_t group_desc_size;
192 grub_uint32_t default_mount_opts;
193 grub_uint32_t first_meta_bg;
194 grub_uint32_t mkfs_time;
195 grub_uint32_t jnl_blocks[17];
198 /* The ext2 blockgroup. */
199 struct grub_ext2_block_group
201 grub_uint32_t block_id;
202 grub_uint32_t inode_id;
203 grub_uint32_t inode_table_id;
204 grub_uint16_t free_blocks;
205 grub_uint16_t free_inodes;
206 grub_uint16_t used_dirs;
208 grub_uint32_t reserved[3];
209 grub_uint32_t block_id_hi;
210 grub_uint32_t inode_id_hi;
211 grub_uint32_t inode_table_id_hi;
212 grub_uint16_t free_blocks_hi;
213 grub_uint16_t free_inodes_hi;
214 grub_uint16_t used_dirs_hi;
216 grub_uint32_t reserved2[3];
219 /* The ext2 inode. */
220 struct grub_ext2_inode
230 grub_uint16_t nlinks;
231 grub_uint32_t blockcnt; /* Blocks of 512 bytes!! */
238 grub_uint32_t dir_blocks[INDIRECT_BLOCKS];
239 grub_uint32_t indir_block;
240 grub_uint32_t double_indir_block;
241 grub_uint32_t triple_indir_block;
245 grub_uint32_t version;
247 grub_uint32_t size_high;
248 grub_uint32_t fragment_addr;
249 grub_uint32_t osd2[3];
252 /* The header of an ext2 directory entry. */
256 grub_uint16_t direntlen;
257 #define MAX_NAMELEN 255
258 grub_uint8_t namelen;
259 grub_uint8_t filetype;
262 struct grub_ext3_journal_header
265 grub_uint32_t block_type;
266 grub_uint32_t sequence;
269 struct grub_ext3_journal_revoke_header
271 struct grub_ext3_journal_header header;
273 grub_uint32_t data[0];
276 struct grub_ext3_journal_block_tag
282 struct grub_ext3_journal_sblock
284 struct grub_ext3_journal_header header;
285 grub_uint32_t block_size;
286 grub_uint32_t maxlen;
288 grub_uint32_t sequence;
292 #define EXT4_EXT_MAGIC 0xf30a
294 struct grub_ext4_extent_header
297 grub_uint16_t entries;
300 grub_uint32_t generation;
303 struct grub_ext4_extent
307 grub_uint16_t start_hi;
311 struct grub_ext4_extent_idx
315 grub_uint16_t leaf_hi;
316 grub_uint16_t unused;
319 struct grub_fshelp_node
321 struct grub_ext2_data *data;
322 struct grub_ext2_inode inode;
327 /* Information about a "mounted" ext2 filesystem. */
328 struct grub_ext2_data
330 struct grub_ext2_sblock sblock;
331 int log_group_desc_size;
333 struct grub_ext2_inode *inode;
334 struct grub_fshelp_node diropen;
337 static grub_dl_t my_mod;
341 /* Check is a = b^x for some x. */
343 is_power_of (grub_uint64_t a, grub_uint32_t b)
346 /* Prevent overflow assuming b < 8. */
347 if (a >= (1LL << 60))
349 for (c = 1; c <= a; c *= b);
355 group_has_super_block (struct grub_ext2_data *data, grub_uint64_t group)
357 if (!(data->sblock.feature_ro_compat
358 & grub_cpu_to_le32_compile_time(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)))
360 /* Algorithm looked up in Linux source. */
363 /* Even number is never a power of odd number. */
366 return (is_power_of(group, 7) || is_power_of(group, 5) ||
367 is_power_of(group, 3));
370 /* Read into BLKGRP the blockgroup descriptor of blockgroup GROUP of
371 the mounted filesystem DATA. */
372 inline static grub_err_t
373 grub_ext2_blockgroup (struct grub_ext2_data *data, grub_uint64_t group,
374 struct grub_ext2_block_group *blkgrp)
376 grub_uint64_t full_offset = (group << data->log_group_desc_size);
377 grub_uint64_t block, offset;
378 block = (full_offset >> LOG2_BLOCK_SIZE (data));
379 offset = (full_offset & ((1 << LOG2_BLOCK_SIZE (data)) - 1));
380 if ((data->sblock.feature_incompat
381 & grub_cpu_to_le32_compile_time (EXT2_FEATURE_INCOMPAT_META_BG))
382 && block >= grub_le_to_cpu32(data->sblock.first_meta_bg))
384 grub_uint64_t first_block_group;
385 /* Find the first block group for which a descriptor
386 is stored in given block. */
387 first_block_group = (block << (LOG2_BLOCK_SIZE (data)
388 - data->log_group_desc_size));
390 block = (first_block_group
391 * grub_le_to_cpu32(data->sblock.blocks_per_group));
393 if (group_has_super_block (data, first_block_group))
399 return grub_disk_read (data->disk,
400 ((grub_le_to_cpu32 (data->sblock.first_data_block)
402 << LOG2_EXT2_BLOCK_SIZE (data)), offset,
403 sizeof (struct grub_ext2_block_group), blkgrp);
406 static struct grub_ext4_extent_header *
407 grub_ext4_find_leaf (struct grub_ext2_data *data,
408 struct grub_ext4_extent_header *ext_block,
409 grub_uint32_t fileblock)
411 struct grub_ext4_extent_idx *index;
417 grub_disk_addr_t block;
419 index = (struct grub_ext4_extent_idx *) (ext_block + 1);
421 if (ext_block->magic != grub_cpu_to_le16_compile_time (EXT4_EXT_MAGIC))
424 if (ext_block->depth == 0)
427 for (i = 0; i < grub_le_to_cpu16 (ext_block->entries); i++)
429 if (fileblock < grub_le_to_cpu32(index[i].block))
436 block = grub_le_to_cpu16 (index[i].leaf_hi);
437 block = (block << 32) | grub_le_to_cpu32 (index[i].leaf);
439 buf = grub_malloc (EXT2_BLOCK_SIZE(data));
442 if (grub_disk_read (data->disk,
443 block << LOG2_EXT2_BLOCK_SIZE (data),
444 0, EXT2_BLOCK_SIZE(data), buf))
454 static grub_disk_addr_t
455 grub_ext2_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
457 struct grub_ext2_data *data = node->data;
458 struct grub_ext2_inode *inode = &node->inode;
459 unsigned int blksz = EXT2_BLOCK_SIZE (data);
460 grub_disk_addr_t blksz_quarter = blksz / 4;
461 int log2_blksz = LOG2_EXT2_BLOCK_SIZE (data);
462 int log_perblock = log2_blksz + 9 - 2;
466 if (inode->flags & grub_cpu_to_le32_compile_time (EXT4_EXTENTS_FLAG))
468 struct grub_ext4_extent_header *leaf;
469 struct grub_ext4_extent *ext;
471 grub_disk_addr_t ret;
473 leaf = grub_ext4_find_leaf (data, (struct grub_ext4_extent_header *) inode->blocks.dir_blocks, fileblock);
476 grub_error (GRUB_ERR_BAD_FS, "invalid extent");
480 ext = (struct grub_ext4_extent *) (leaf + 1);
481 for (i = 0; i < grub_le_to_cpu16 (leaf->entries); i++)
483 if (fileblock < grub_le_to_cpu32 (ext[i].block))
489 fileblock -= grub_le_to_cpu32 (ext[i].block);
490 if (fileblock >= grub_le_to_cpu16 (ext[i].len))
494 grub_disk_addr_t start;
496 start = grub_le_to_cpu16 (ext[i].start_hi);
497 start = (start << 32) + grub_le_to_cpu32 (ext[i].start);
499 ret = fileblock + start;
504 grub_error (GRUB_ERR_BAD_FS, "something wrong with extent");
508 if (leaf != (struct grub_ext4_extent_header *) inode->blocks.dir_blocks)
515 if (fileblock < INDIRECT_BLOCKS)
516 return grub_le_to_cpu32 (inode->blocks.dir_blocks[fileblock]);
517 fileblock -= INDIRECT_BLOCKS;
519 if (fileblock < blksz_quarter)
521 indir = inode->blocks.indir_block;
525 fileblock -= blksz_quarter;
526 /* Double indirect. */
527 if (fileblock < blksz_quarter * blksz_quarter)
529 indir = inode->blocks.double_indir_block;
533 fileblock -= blksz_quarter * blksz_quarter;
534 /* Triple indirect. */
535 if (fileblock < blksz_quarter * blksz_quarter * (blksz_quarter + 1))
537 indir = inode->blocks.triple_indir_block;
541 grub_error (GRUB_ERR_BAD_FS,
542 "ext2fs doesn't support quadruple indirect blocks");
547 /* If the indirect block is zero, all child blocks are absent
548 (i.e. filled with zeros.) */
551 if (grub_disk_read (data->disk,
552 ((grub_disk_addr_t) grub_le_to_cpu32 (indir))
554 ((fileblock >> (log_perblock * shift))
555 & ((1 << log_perblock) - 1))
557 sizeof (indir), &indir))
561 return grub_le_to_cpu32 (indir);
564 /* Read LEN bytes from the file described by DATA starting with byte
565 POS. Return the amount of read bytes in READ. */
567 grub_ext2_read_file (grub_fshelp_node_t node,
568 grub_disk_read_hook_t read_hook, void *read_hook_data,
569 grub_off_t pos, grub_size_t len, char *buf)
571 return grub_fshelp_read_file (node->data->disk, node,
572 read_hook, read_hook_data,
573 pos, len, buf, grub_ext2_read_block,
574 grub_cpu_to_le32 (node->inode.size)
575 | (((grub_off_t) grub_cpu_to_le32 (node->inode.size_high)) << 32),
576 LOG2_EXT2_BLOCK_SIZE (node->data), 0);
581 /* Read the inode INO for the file described by DATA into INODE. */
583 grub_ext2_read_inode (struct grub_ext2_data *data,
584 int ino, struct grub_ext2_inode *inode)
586 struct grub_ext2_block_group blkgrp;
587 struct grub_ext2_sblock *sblock = &data->sblock;
588 int inodes_per_block;
591 grub_disk_addr_t base;
593 /* It is easier to calculate if the first inode is 0. */
596 grub_ext2_blockgroup (data,
597 ino / grub_le_to_cpu32 (sblock->inodes_per_group),
602 inodes_per_block = EXT2_BLOCK_SIZE (data) / EXT2_INODE_SIZE (data);
603 blkno = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
605 blkoff = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
608 base = grub_le_to_cpu32 (blkgrp.inode_table_id);
609 if (data->log_group_desc_size >= 6)
610 base |= (((grub_disk_addr_t) grub_le_to_cpu32 (blkgrp.inode_table_id_hi))
613 /* Read the inode. */
614 if (grub_disk_read (data->disk,
615 ((base + blkno) << LOG2_EXT2_BLOCK_SIZE (data)),
616 EXT2_INODE_SIZE (data) * blkoff,
617 sizeof (struct grub_ext2_inode), inode))
623 static struct grub_ext2_data *
624 grub_ext2_mount (grub_disk_t disk)
626 struct grub_ext2_data *data;
628 data = grub_malloc (sizeof (struct grub_ext2_data));
632 /* Read the superblock. */
633 grub_disk_read (disk, 1 * 2, 0, sizeof (struct grub_ext2_sblock),
638 /* Make sure this is an ext2 filesystem. */
639 if (data->sblock.magic != grub_cpu_to_le16_compile_time (EXT2_MAGIC)
640 || grub_le_to_cpu32 (data->sblock.log2_block_size) >= 16
641 || data->sblock.inodes_per_group == 0
642 /* 20 already means 1GiB blocks. We don't want to deal with blocks overflowing int32. */
643 || grub_le_to_cpu32 (data->sblock.log2_block_size) > 20
644 || EXT2_INODE_SIZE (data) == 0
645 || EXT2_BLOCK_SIZE (data) / EXT2_INODE_SIZE (data) == 0)
647 grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
651 /* Check the FS doesn't have feature bits enabled that we don't support. */
652 if (data->sblock.revision_level != grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION)
653 && (data->sblock.feature_incompat
654 & grub_cpu_to_le32_compile_time (~(EXT2_DRIVER_SUPPORTED_INCOMPAT
655 | EXT2_DRIVER_IGNORED_INCOMPAT))))
657 grub_error (GRUB_ERR_BAD_FS, "filesystem has unsupported incompatible features");
661 if (data->sblock.revision_level != grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION)
662 && (data->sblock.feature_incompat
663 & grub_cpu_to_le32_compile_time (EXT4_FEATURE_INCOMPAT_64BIT))
664 && data->sblock.group_desc_size != 0
665 && ((data->sblock.group_desc_size & (data->sblock.group_desc_size - 1))
667 && (data->sblock.group_desc_size & grub_cpu_to_le16_compile_time (0x1fe0)))
669 grub_uint16_t b = grub_le_to_cpu16 (data->sblock.group_desc_size);
670 for (data->log_group_desc_size = 0; b != (1 << data->log_group_desc_size);
671 data->log_group_desc_size++);
674 data->log_group_desc_size = 5;
678 data->diropen.data = data;
679 data->diropen.ino = 2;
680 data->diropen.inode_read = 1;
682 data->inode = &data->diropen.inode;
684 grub_ext2_read_inode (data, 2, data->inode);
691 if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
692 grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
699 grub_ext2_read_symlink (grub_fshelp_node_t node)
702 struct grub_fshelp_node *diro = node;
704 if (! diro->inode_read)
706 grub_ext2_read_inode (diro->data, diro->ino, &diro->inode);
711 symlink = grub_malloc (grub_le_to_cpu32 (diro->inode.size) + 1);
715 /* If the filesize of the symlink is bigger than
716 60 the symlink is stored in a separate block,
717 otherwise it is stored in the inode. */
718 if (grub_le_to_cpu32 (diro->inode.size) <= sizeof (diro->inode.symlink))
719 grub_memcpy (symlink,
721 grub_le_to_cpu32 (diro->inode.size));
724 grub_ext2_read_file (diro, 0, 0, 0,
725 grub_le_to_cpu32 (diro->inode.size),
734 symlink[grub_le_to_cpu32 (diro->inode.size)] = '\0';
739 grub_ext2_iterate_dir (grub_fshelp_node_t dir,
740 grub_fshelp_iterate_dir_hook_t hook, void *hook_data)
742 unsigned int fpos = 0;
743 struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
745 if (! diro->inode_read)
747 grub_ext2_read_inode (diro->data, diro->ino, &diro->inode);
752 /* Search the file. */
753 while (fpos < grub_le_to_cpu32 (diro->inode.size))
755 struct ext2_dirent dirent;
757 grub_ext2_read_file (diro, 0, 0, fpos, sizeof (struct ext2_dirent),
762 if (dirent.direntlen == 0)
765 if (dirent.inode != 0 && dirent.namelen != 0)
767 char filename[MAX_NAMELEN + 1];
768 struct grub_fshelp_node *fdiro;
769 enum grub_fshelp_filetype type = GRUB_FSHELP_UNKNOWN;
771 grub_ext2_read_file (diro, 0, 0, fpos + sizeof (struct ext2_dirent),
772 dirent.namelen, filename);
776 fdiro = grub_malloc (sizeof (struct grub_fshelp_node));
780 fdiro->data = diro->data;
781 fdiro->ino = grub_le_to_cpu32 (dirent.inode);
783 filename[dirent.namelen] = '\0';
785 if (dirent.filetype != FILETYPE_UNKNOWN)
787 fdiro->inode_read = 0;
789 if (dirent.filetype == FILETYPE_DIRECTORY)
790 type = GRUB_FSHELP_DIR;
791 else if (dirent.filetype == FILETYPE_SYMLINK)
792 type = GRUB_FSHELP_SYMLINK;
793 else if (dirent.filetype == FILETYPE_REG)
794 type = GRUB_FSHELP_REG;
798 /* The filetype can not be read from the dirent, read
799 the inode to get more information. */
800 grub_ext2_read_inode (diro->data,
801 grub_le_to_cpu32 (dirent.inode),
809 fdiro->inode_read = 1;
811 if ((grub_le_to_cpu16 (fdiro->inode.mode)
812 & FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
813 type = GRUB_FSHELP_DIR;
814 else if ((grub_le_to_cpu16 (fdiro->inode.mode)
815 & FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
816 type = GRUB_FSHELP_SYMLINK;
817 else if ((grub_le_to_cpu16 (fdiro->inode.mode)
818 & FILETYPE_INO_MASK) == FILETYPE_INO_REG)
819 type = GRUB_FSHELP_REG;
822 if (hook (filename, type, fdiro, hook_data))
826 fpos += grub_le_to_cpu16 (dirent.direntlen);
832 /* Open a file named NAME and initialize FILE. */
834 grub_ext2_open (struct grub_file *file, const char *name)
836 struct grub_ext2_data *data;
837 struct grub_fshelp_node *fdiro = 0;
840 grub_dl_ref (my_mod);
842 data = grub_ext2_mount (file->device->disk);
849 err = grub_fshelp_find_file (name, &data->diropen, &fdiro,
850 grub_ext2_iterate_dir,
851 grub_ext2_read_symlink, GRUB_FSHELP_REG);
855 if (! fdiro->inode_read)
857 err = grub_ext2_read_inode (data, fdiro->ino, &fdiro->inode);
862 grub_memcpy (data->inode, &fdiro->inode, sizeof (struct grub_ext2_inode));
865 file->size = grub_le_to_cpu32 (data->inode->size);
866 file->size |= ((grub_off_t) grub_le_to_cpu32 (data->inode->size_high)) << 32;
873 if (fdiro != &data->diropen)
877 grub_dl_unref (my_mod);
883 grub_ext2_close (grub_file_t file)
885 grub_free (file->data);
887 grub_dl_unref (my_mod);
889 return GRUB_ERR_NONE;
892 /* Read LEN bytes data from FILE into BUF. */
894 grub_ext2_read (grub_file_t file, char *buf, grub_size_t len)
896 struct grub_ext2_data *data = (struct grub_ext2_data *) file->data;
898 return grub_ext2_read_file (&data->diropen,
899 file->read_hook, file->read_hook_data,
900 file->offset, len, buf);
904 /* Context for grub_ext2_dir. */
905 struct grub_ext2_dir_ctx
907 grub_fs_dir_hook_t hook;
909 struct grub_ext2_data *data;
912 /* Helper for grub_ext2_dir. */
914 grub_ext2_dir_iter (const char *filename, enum grub_fshelp_filetype filetype,
915 grub_fshelp_node_t node, void *data)
917 struct grub_ext2_dir_ctx *ctx = data;
918 struct grub_dirhook_info info;
920 grub_memset (&info, 0, sizeof (info));
921 if (! node->inode_read)
923 grub_ext2_read_inode (ctx->data, node->ino, &node->inode);
925 node->inode_read = 1;
926 grub_errno = GRUB_ERR_NONE;
928 if (node->inode_read)
931 info.mtime = grub_le_to_cpu32 (node->inode.mtime);
934 info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
936 return ctx->hook (filename, &info, ctx->hook_data);
940 grub_ext2_dir (grub_device_t device, const char *path, grub_fs_dir_hook_t hook,
943 struct grub_ext2_dir_ctx ctx = {
945 .hook_data = hook_data
947 struct grub_fshelp_node *fdiro = 0;
949 grub_dl_ref (my_mod);
951 ctx.data = grub_ext2_mount (device->disk);
955 grub_fshelp_find_file (path, &ctx.data->diropen, &fdiro,
956 grub_ext2_iterate_dir, grub_ext2_read_symlink,
961 grub_ext2_iterate_dir (fdiro, grub_ext2_dir_iter, &ctx);
964 if (fdiro != &ctx.data->diropen)
966 grub_free (ctx.data);
968 grub_dl_unref (my_mod);
974 grub_ext2_label (grub_device_t device, char **label)
976 struct grub_ext2_data *data;
977 grub_disk_t disk = device->disk;
979 grub_dl_ref (my_mod);
981 data = grub_ext2_mount (disk);
983 *label = grub_strndup (data->sblock.volume_name,
984 sizeof (data->sblock.volume_name));
988 grub_dl_unref (my_mod);
996 grub_ext2_uuid (grub_device_t device, char **uuid)
998 struct grub_ext2_data *data;
999 grub_disk_t disk = device->disk;
1001 grub_dl_ref (my_mod);
1003 data = grub_ext2_mount (disk);
1006 *uuid = grub_xasprintf ("%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
1007 grub_be_to_cpu16 (data->sblock.uuid[0]),
1008 grub_be_to_cpu16 (data->sblock.uuid[1]),
1009 grub_be_to_cpu16 (data->sblock.uuid[2]),
1010 grub_be_to_cpu16 (data->sblock.uuid[3]),
1011 grub_be_to_cpu16 (data->sblock.uuid[4]),
1012 grub_be_to_cpu16 (data->sblock.uuid[5]),
1013 grub_be_to_cpu16 (data->sblock.uuid[6]),
1014 grub_be_to_cpu16 (data->sblock.uuid[7]));
1019 grub_dl_unref (my_mod);
1028 grub_ext2_mtime (grub_device_t device, grub_int32_t *tm)
1030 struct grub_ext2_data *data;
1031 grub_disk_t disk = device->disk;
1033 grub_dl_ref (my_mod);
1035 data = grub_ext2_mount (disk);
1039 *tm = grub_le_to_cpu32 (data->sblock.utime);
1041 grub_dl_unref (my_mod);
1051 static struct grub_fs grub_ext2_fs =
1054 .dir = grub_ext2_dir,
1055 .open = grub_ext2_open,
1056 .read = grub_ext2_read,
1057 .close = grub_ext2_close,
1058 .label = grub_ext2_label,
1059 .uuid = grub_ext2_uuid,
1060 .mtime = grub_ext2_mtime,
1062 .reserved_first_sector = 1,
1063 .blocklist_install = 1,
1070 grub_fs_register (&grub_ext2_fs);
1076 grub_fs_unregister (&grub_ext2_fs);