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
105 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
107 /* The set of back-incompatible features this driver DOES support. Add (OR)
108 * flags here as the related features are implemented into the driver. */
109 #define EXT2_DRIVER_SUPPORTED_INCOMPAT ( EXT2_FEATURE_INCOMPAT_FILETYPE \
110 | EXT4_FEATURE_INCOMPAT_EXTENTS \
111 | EXT4_FEATURE_INCOMPAT_FLEX_BG \
112 | EXT2_FEATURE_INCOMPAT_META_BG \
113 | EXT4_FEATURE_INCOMPAT_64BIT \
114 | EXT4_FEATURE_INCOMPAT_ENCRYPT)
115 /* List of rationales for the ignored "incompatible" features:
116 * needs_recovery: Not really back-incompatible - was added as such to forbid
117 * ext2 drivers from mounting an ext3 volume with a dirty
118 * journal because they will ignore the journal, but the next
119 * ext3 driver to mount the volume will find the journal and
120 * replay it, potentially corrupting the metadata written by
121 * the ext2 drivers. Safe to ignore for this RO driver.
122 * mmp: Not really back-incompatible - was added as such to
123 * avoid multiple read-write mounts. Safe to ignore for this
126 #define EXT2_DRIVER_IGNORED_INCOMPAT ( EXT3_FEATURE_INCOMPAT_RECOVER \
127 | EXT4_FEATURE_INCOMPAT_MMP)
130 #define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U
132 #define EXT3_JOURNAL_DESCRIPTOR_BLOCK 1
133 #define EXT3_JOURNAL_COMMIT_BLOCK 2
134 #define EXT3_JOURNAL_SUPERBLOCK_V1 3
135 #define EXT3_JOURNAL_SUPERBLOCK_V2 4
136 #define EXT3_JOURNAL_REVOKE_BLOCK 5
138 #define EXT3_JOURNAL_FLAG_ESCAPE 1
139 #define EXT3_JOURNAL_FLAG_SAME_UUID 2
140 #define EXT3_JOURNAL_FLAG_DELETED 4
141 #define EXT3_JOURNAL_FLAG_LAST_TAG 8
143 #define EXT4_ENCRYPT_FLAG 0x800
144 #define EXT4_EXTENTS_FLAG 0x80000
146 /* The ext2 superblock. */
147 struct grub_ext2_sblock
149 grub_uint32_t total_inodes;
150 grub_uint32_t total_blocks;
151 grub_uint32_t reserved_blocks;
152 grub_uint32_t free_blocks;
153 grub_uint32_t free_inodes;
154 grub_uint32_t first_data_block;
155 grub_uint32_t log2_block_size;
156 grub_uint32_t log2_fragment_size;
157 grub_uint32_t blocks_per_group;
158 grub_uint32_t fragments_per_group;
159 grub_uint32_t inodes_per_group;
162 grub_uint16_t mnt_count;
163 grub_uint16_t max_mnt_count;
165 grub_uint16_t fs_state;
166 grub_uint16_t error_handling;
167 grub_uint16_t minor_revision_level;
168 grub_uint32_t lastcheck;
169 grub_uint32_t checkinterval;
170 grub_uint32_t creator_os;
171 grub_uint32_t revision_level;
172 grub_uint16_t uid_reserved;
173 grub_uint16_t gid_reserved;
174 grub_uint32_t first_inode;
175 grub_uint16_t inode_size;
176 grub_uint16_t block_group_number;
177 grub_uint32_t feature_compatibility;
178 grub_uint32_t feature_incompat;
179 grub_uint32_t feature_ro_compat;
180 grub_uint16_t uuid[8];
181 char volume_name[16];
182 char last_mounted_on[64];
183 grub_uint32_t compression_info;
184 grub_uint8_t prealloc_blocks;
185 grub_uint8_t prealloc_dir_blocks;
186 grub_uint16_t reserved_gdt_blocks;
187 grub_uint8_t journal_uuid[16];
188 grub_uint32_t journal_inum;
189 grub_uint32_t journal_dev;
190 grub_uint32_t last_orphan;
191 grub_uint32_t hash_seed[4];
192 grub_uint8_t def_hash_version;
193 grub_uint8_t jnl_backup_type;
194 grub_uint16_t group_desc_size;
195 grub_uint32_t default_mount_opts;
196 grub_uint32_t first_meta_bg;
197 grub_uint32_t mkfs_time;
198 grub_uint32_t jnl_blocks[17];
201 /* The ext2 blockgroup. */
202 struct grub_ext2_block_group
204 grub_uint32_t block_id;
205 grub_uint32_t inode_id;
206 grub_uint32_t inode_table_id;
207 grub_uint16_t free_blocks;
208 grub_uint16_t free_inodes;
209 grub_uint16_t used_dirs;
211 grub_uint32_t reserved[3];
212 grub_uint32_t block_id_hi;
213 grub_uint32_t inode_id_hi;
214 grub_uint32_t inode_table_id_hi;
215 grub_uint16_t free_blocks_hi;
216 grub_uint16_t free_inodes_hi;
217 grub_uint16_t used_dirs_hi;
219 grub_uint32_t reserved2[3];
222 /* The ext2 inode. */
223 struct grub_ext2_inode
233 grub_uint16_t nlinks;
234 grub_uint32_t blockcnt; /* Blocks of 512 bytes!! */
241 grub_uint32_t dir_blocks[INDIRECT_BLOCKS];
242 grub_uint32_t indir_block;
243 grub_uint32_t double_indir_block;
244 grub_uint32_t triple_indir_block;
248 grub_uint32_t version;
250 grub_uint32_t size_high;
251 grub_uint32_t fragment_addr;
252 grub_uint32_t osd2[3];
255 /* The header of an ext2 directory entry. */
259 grub_uint16_t direntlen;
260 #define MAX_NAMELEN 255
261 grub_uint8_t namelen;
262 grub_uint8_t filetype;
265 struct grub_ext3_journal_header
268 grub_uint32_t block_type;
269 grub_uint32_t sequence;
272 struct grub_ext3_journal_revoke_header
274 struct grub_ext3_journal_header header;
276 grub_uint32_t data[0];
279 struct grub_ext3_journal_block_tag
285 struct grub_ext3_journal_sblock
287 struct grub_ext3_journal_header header;
288 grub_uint32_t block_size;
289 grub_uint32_t maxlen;
291 grub_uint32_t sequence;
295 #define EXT4_EXT_MAGIC 0xf30a
297 struct grub_ext4_extent_header
300 grub_uint16_t entries;
303 grub_uint32_t generation;
306 struct grub_ext4_extent
310 grub_uint16_t start_hi;
314 struct grub_ext4_extent_idx
318 grub_uint16_t leaf_hi;
319 grub_uint16_t unused;
322 struct grub_fshelp_node
324 struct grub_ext2_data *data;
325 struct grub_ext2_inode inode;
330 /* Information about a "mounted" ext2 filesystem. */
331 struct grub_ext2_data
333 struct grub_ext2_sblock sblock;
334 int log_group_desc_size;
336 struct grub_ext2_inode *inode;
337 struct grub_fshelp_node diropen;
340 static grub_dl_t my_mod;
344 /* Check is a = b^x for some x. */
346 is_power_of (grub_uint64_t a, grub_uint32_t b)
349 /* Prevent overflow assuming b < 8. */
350 if (a >= (1LL << 60))
352 for (c = 1; c <= a; c *= b);
358 group_has_super_block (struct grub_ext2_data *data, grub_uint64_t group)
360 if (!(data->sblock.feature_ro_compat
361 & grub_cpu_to_le32_compile_time(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER)))
363 /* Algorithm looked up in Linux source. */
366 /* Even number is never a power of odd number. */
369 return (is_power_of(group, 7) || is_power_of(group, 5) ||
370 is_power_of(group, 3));
373 /* Read into BLKGRP the blockgroup descriptor of blockgroup GROUP of
374 the mounted filesystem DATA. */
375 inline static grub_err_t
376 grub_ext2_blockgroup (struct grub_ext2_data *data, grub_uint64_t group,
377 struct grub_ext2_block_group *blkgrp)
379 grub_uint64_t full_offset = (group << data->log_group_desc_size);
380 grub_uint64_t block, offset;
381 block = (full_offset >> LOG2_BLOCK_SIZE (data));
382 offset = (full_offset & ((1 << LOG2_BLOCK_SIZE (data)) - 1));
383 if ((data->sblock.feature_incompat
384 & grub_cpu_to_le32_compile_time (EXT2_FEATURE_INCOMPAT_META_BG))
385 && block >= grub_le_to_cpu32(data->sblock.first_meta_bg))
387 grub_uint64_t first_block_group;
388 /* Find the first block group for which a descriptor
389 is stored in given block. */
390 first_block_group = (block << (LOG2_BLOCK_SIZE (data)
391 - data->log_group_desc_size));
393 block = (first_block_group
394 * grub_le_to_cpu32(data->sblock.blocks_per_group));
396 if (group_has_super_block (data, first_block_group))
402 return grub_disk_read (data->disk,
403 ((grub_le_to_cpu32 (data->sblock.first_data_block)
405 << LOG2_EXT2_BLOCK_SIZE (data)), offset,
406 sizeof (struct grub_ext2_block_group), blkgrp);
409 static struct grub_ext4_extent_header *
410 grub_ext4_find_leaf (struct grub_ext2_data *data,
411 struct grub_ext4_extent_header *ext_block,
412 grub_uint32_t fileblock)
414 struct grub_ext4_extent_idx *index;
420 grub_disk_addr_t block;
422 index = (struct grub_ext4_extent_idx *) (ext_block + 1);
424 if (ext_block->magic != grub_cpu_to_le16_compile_time (EXT4_EXT_MAGIC))
427 if (ext_block->depth == 0)
430 for (i = 0; i < grub_le_to_cpu16 (ext_block->entries); i++)
432 if (fileblock < grub_le_to_cpu32(index[i].block))
439 block = grub_le_to_cpu16 (index[i].leaf_hi);
440 block = (block << 32) | grub_le_to_cpu32 (index[i].leaf);
442 buf = grub_malloc (EXT2_BLOCK_SIZE(data));
445 if (grub_disk_read (data->disk,
446 block << LOG2_EXT2_BLOCK_SIZE (data),
447 0, EXT2_BLOCK_SIZE(data), buf))
457 static grub_disk_addr_t
458 grub_ext2_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
460 struct grub_ext2_data *data = node->data;
461 struct grub_ext2_inode *inode = &node->inode;
462 unsigned int blksz = EXT2_BLOCK_SIZE (data);
463 grub_disk_addr_t blksz_quarter = blksz / 4;
464 int log2_blksz = LOG2_EXT2_BLOCK_SIZE (data);
465 int log_perblock = log2_blksz + 9 - 2;
469 if (inode->flags & grub_cpu_to_le32_compile_time (EXT4_EXTENTS_FLAG))
471 struct grub_ext4_extent_header *leaf;
472 struct grub_ext4_extent *ext;
474 grub_disk_addr_t ret;
476 leaf = grub_ext4_find_leaf (data, (struct grub_ext4_extent_header *) inode->blocks.dir_blocks, fileblock);
479 grub_error (GRUB_ERR_BAD_FS, "invalid extent");
483 ext = (struct grub_ext4_extent *) (leaf + 1);
484 for (i = 0; i < grub_le_to_cpu16 (leaf->entries); i++)
486 if (fileblock < grub_le_to_cpu32 (ext[i].block))
492 fileblock -= grub_le_to_cpu32 (ext[i].block);
493 if (fileblock >= grub_le_to_cpu16 (ext[i].len))
497 grub_disk_addr_t start;
499 start = grub_le_to_cpu16 (ext[i].start_hi);
500 start = (start << 32) + grub_le_to_cpu32 (ext[i].start);
502 ret = fileblock + start;
507 grub_error (GRUB_ERR_BAD_FS, "something wrong with extent");
511 if (leaf != (struct grub_ext4_extent_header *) inode->blocks.dir_blocks)
518 if (fileblock < INDIRECT_BLOCKS)
519 return grub_le_to_cpu32 (inode->blocks.dir_blocks[fileblock]);
520 fileblock -= INDIRECT_BLOCKS;
522 if (fileblock < blksz_quarter)
524 indir = inode->blocks.indir_block;
528 fileblock -= blksz_quarter;
529 /* Double indirect. */
530 if (fileblock < blksz_quarter * blksz_quarter)
532 indir = inode->blocks.double_indir_block;
536 fileblock -= blksz_quarter * blksz_quarter;
537 /* Triple indirect. */
538 if (fileblock < blksz_quarter * blksz_quarter * (blksz_quarter + 1))
540 indir = inode->blocks.triple_indir_block;
544 grub_error (GRUB_ERR_BAD_FS,
545 "ext2fs doesn't support quadruple indirect blocks");
550 /* If the indirect block is zero, all child blocks are absent
551 (i.e. filled with zeros.) */
554 if (grub_disk_read (data->disk,
555 ((grub_disk_addr_t) grub_le_to_cpu32 (indir))
557 ((fileblock >> (log_perblock * shift))
558 & ((1 << log_perblock) - 1))
560 sizeof (indir), &indir))
564 return grub_le_to_cpu32 (indir);
567 /* Read LEN bytes from the file described by DATA starting with byte
568 POS. Return the amount of read bytes in READ. */
570 grub_ext2_read_file (grub_fshelp_node_t node,
571 grub_disk_read_hook_t read_hook, void *read_hook_data,
572 grub_off_t pos, grub_size_t len, char *buf)
574 return grub_fshelp_read_file (node->data->disk, node,
575 read_hook, read_hook_data,
576 pos, len, buf, grub_ext2_read_block,
577 grub_cpu_to_le32 (node->inode.size)
578 | (((grub_off_t) grub_cpu_to_le32 (node->inode.size_high)) << 32),
579 LOG2_EXT2_BLOCK_SIZE (node->data), 0);
584 /* Read the inode INO for the file described by DATA into INODE. */
586 grub_ext2_read_inode (struct grub_ext2_data *data,
587 int ino, struct grub_ext2_inode *inode)
589 struct grub_ext2_block_group blkgrp;
590 struct grub_ext2_sblock *sblock = &data->sblock;
591 int inodes_per_block;
594 grub_disk_addr_t base;
596 /* It is easier to calculate if the first inode is 0. */
599 grub_ext2_blockgroup (data,
600 ino / grub_le_to_cpu32 (sblock->inodes_per_group),
605 inodes_per_block = EXT2_BLOCK_SIZE (data) / EXT2_INODE_SIZE (data);
606 blkno = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
608 blkoff = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
611 base = grub_le_to_cpu32 (blkgrp.inode_table_id);
612 if (data->log_group_desc_size >= 6)
613 base |= (((grub_disk_addr_t) grub_le_to_cpu32 (blkgrp.inode_table_id_hi))
616 /* Read the inode. */
617 if (grub_disk_read (data->disk,
618 ((base + blkno) << LOG2_EXT2_BLOCK_SIZE (data)),
619 EXT2_INODE_SIZE (data) * blkoff,
620 sizeof (struct grub_ext2_inode), inode))
626 static struct grub_ext2_data *
627 grub_ext2_mount (grub_disk_t disk)
629 struct grub_ext2_data *data;
631 data = grub_malloc (sizeof (struct grub_ext2_data));
635 /* Read the superblock. */
636 grub_disk_read (disk, 1 * 2, 0, sizeof (struct grub_ext2_sblock),
641 /* Make sure this is an ext2 filesystem. */
642 if (data->sblock.magic != grub_cpu_to_le16_compile_time (EXT2_MAGIC)
643 || grub_le_to_cpu32 (data->sblock.log2_block_size) >= 16
644 || data->sblock.inodes_per_group == 0
645 /* 20 already means 1GiB blocks. We don't want to deal with blocks overflowing int32. */
646 || grub_le_to_cpu32 (data->sblock.log2_block_size) > 20
647 || EXT2_INODE_SIZE (data) == 0
648 || EXT2_BLOCK_SIZE (data) / EXT2_INODE_SIZE (data) == 0)
650 grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
654 /* Check the FS doesn't have feature bits enabled that we don't support. */
655 if (data->sblock.revision_level != grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION)
656 && (data->sblock.feature_incompat
657 & grub_cpu_to_le32_compile_time (~(EXT2_DRIVER_SUPPORTED_INCOMPAT
658 | EXT2_DRIVER_IGNORED_INCOMPAT))))
660 grub_error (GRUB_ERR_BAD_FS, "filesystem has unsupported incompatible features");
664 if (data->sblock.revision_level != grub_cpu_to_le32_compile_time (EXT2_GOOD_OLD_REVISION)
665 && (data->sblock.feature_incompat
666 & grub_cpu_to_le32_compile_time (EXT4_FEATURE_INCOMPAT_64BIT))
667 && data->sblock.group_desc_size != 0
668 && ((data->sblock.group_desc_size & (data->sblock.group_desc_size - 1))
670 && (data->sblock.group_desc_size & grub_cpu_to_le16_compile_time (0x1fe0)))
672 grub_uint16_t b = grub_le_to_cpu16 (data->sblock.group_desc_size);
673 for (data->log_group_desc_size = 0; b != (1 << data->log_group_desc_size);
674 data->log_group_desc_size++);
677 data->log_group_desc_size = 5;
681 data->diropen.data = data;
682 data->diropen.ino = 2;
683 data->diropen.inode_read = 1;
685 data->inode = &data->diropen.inode;
687 grub_ext2_read_inode (data, 2, data->inode);
694 if (grub_errno == GRUB_ERR_OUT_OF_RANGE)
695 grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
702 grub_ext2_read_symlink (grub_fshelp_node_t node)
705 struct grub_fshelp_node *diro = node;
707 if (! diro->inode_read)
709 grub_ext2_read_inode (diro->data, diro->ino, &diro->inode);
713 if (diro->inode.flags & grub_cpu_to_le32_compile_time (EXT4_ENCRYPT_FLAG))
715 grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "symlink is encrypted");
720 symlink = grub_malloc (grub_le_to_cpu32 (diro->inode.size) + 1);
724 /* If the filesize of the symlink is bigger than
725 60 the symlink is stored in a separate block,
726 otherwise it is stored in the inode. */
727 if (grub_le_to_cpu32 (diro->inode.size) <= sizeof (diro->inode.symlink))
728 grub_memcpy (symlink,
730 grub_le_to_cpu32 (diro->inode.size));
733 grub_ext2_read_file (diro, 0, 0, 0,
734 grub_le_to_cpu32 (diro->inode.size),
743 symlink[grub_le_to_cpu32 (diro->inode.size)] = '\0';
748 grub_ext2_iterate_dir (grub_fshelp_node_t dir,
749 grub_fshelp_iterate_dir_hook_t hook, void *hook_data)
751 unsigned int fpos = 0;
752 struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
754 if (! diro->inode_read)
756 grub_ext2_read_inode (diro->data, diro->ino, &diro->inode);
761 if (diro->inode.flags & grub_cpu_to_le32_compile_time (EXT4_ENCRYPT_FLAG))
763 grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "directory is encrypted");
767 /* Search the file. */
768 while (fpos < grub_le_to_cpu32 (diro->inode.size))
770 struct ext2_dirent dirent;
772 grub_ext2_read_file (diro, 0, 0, fpos, sizeof (struct ext2_dirent),
777 if (dirent.direntlen == 0)
780 if (dirent.inode != 0 && dirent.namelen != 0)
782 char filename[MAX_NAMELEN + 1];
783 struct grub_fshelp_node *fdiro;
784 enum grub_fshelp_filetype type = GRUB_FSHELP_UNKNOWN;
786 grub_ext2_read_file (diro, 0, 0, fpos + sizeof (struct ext2_dirent),
787 dirent.namelen, filename);
791 fdiro = grub_malloc (sizeof (struct grub_fshelp_node));
795 fdiro->data = diro->data;
796 fdiro->ino = grub_le_to_cpu32 (dirent.inode);
798 filename[dirent.namelen] = '\0';
800 if (dirent.filetype != FILETYPE_UNKNOWN)
802 fdiro->inode_read = 0;
804 if (dirent.filetype == FILETYPE_DIRECTORY)
805 type = GRUB_FSHELP_DIR;
806 else if (dirent.filetype == FILETYPE_SYMLINK)
807 type = GRUB_FSHELP_SYMLINK;
808 else if (dirent.filetype == FILETYPE_REG)
809 type = GRUB_FSHELP_REG;
813 /* The filetype can not be read from the dirent, read
814 the inode to get more information. */
815 grub_ext2_read_inode (diro->data,
816 grub_le_to_cpu32 (dirent.inode),
824 fdiro->inode_read = 1;
826 if ((grub_le_to_cpu16 (fdiro->inode.mode)
827 & FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
828 type = GRUB_FSHELP_DIR;
829 else if ((grub_le_to_cpu16 (fdiro->inode.mode)
830 & FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
831 type = GRUB_FSHELP_SYMLINK;
832 else if ((grub_le_to_cpu16 (fdiro->inode.mode)
833 & FILETYPE_INO_MASK) == FILETYPE_INO_REG)
834 type = GRUB_FSHELP_REG;
837 if (hook (filename, type, fdiro, hook_data))
841 fpos += grub_le_to_cpu16 (dirent.direntlen);
847 /* Open a file named NAME and initialize FILE. */
849 grub_ext2_open (struct grub_file *file, const char *name)
851 struct grub_ext2_data *data;
852 struct grub_fshelp_node *fdiro = 0;
855 grub_dl_ref (my_mod);
857 data = grub_ext2_mount (file->device->disk);
864 err = grub_fshelp_find_file (name, &data->diropen, &fdiro,
865 grub_ext2_iterate_dir,
866 grub_ext2_read_symlink, GRUB_FSHELP_REG);
870 if (! fdiro->inode_read)
872 err = grub_ext2_read_inode (data, fdiro->ino, &fdiro->inode);
877 if (fdiro->inode.flags & grub_cpu_to_le32_compile_time (EXT4_ENCRYPT_FLAG))
879 err = grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "file is encrypted");
883 grub_memcpy (data->inode, &fdiro->inode, sizeof (struct grub_ext2_inode));
886 file->size = grub_le_to_cpu32 (data->inode->size);
887 file->size |= ((grub_off_t) grub_le_to_cpu32 (data->inode->size_high)) << 32;
894 if (fdiro != &data->diropen)
898 grub_dl_unref (my_mod);
904 grub_ext2_close (grub_file_t file)
906 grub_free (file->data);
908 grub_dl_unref (my_mod);
910 return GRUB_ERR_NONE;
913 /* Read LEN bytes data from FILE into BUF. */
915 grub_ext2_read (grub_file_t file, char *buf, grub_size_t len)
917 struct grub_ext2_data *data = (struct grub_ext2_data *) file->data;
919 return grub_ext2_read_file (&data->diropen,
920 file->read_hook, file->read_hook_data,
921 file->offset, len, buf);
925 /* Context for grub_ext2_dir. */
926 struct grub_ext2_dir_ctx
928 grub_fs_dir_hook_t hook;
930 struct grub_ext2_data *data;
933 /* Helper for grub_ext2_dir. */
935 grub_ext2_dir_iter (const char *filename, enum grub_fshelp_filetype filetype,
936 grub_fshelp_node_t node, void *data)
938 struct grub_ext2_dir_ctx *ctx = data;
939 struct grub_dirhook_info info;
941 grub_memset (&info, 0, sizeof (info));
942 if (! node->inode_read)
944 grub_ext2_read_inode (ctx->data, node->ino, &node->inode);
946 node->inode_read = 1;
947 grub_errno = GRUB_ERR_NONE;
949 if (node->inode_read)
952 info.mtime = grub_le_to_cpu32 (node->inode.mtime);
955 info.dir = ((filetype & GRUB_FSHELP_TYPE_MASK) == GRUB_FSHELP_DIR);
957 return ctx->hook (filename, &info, ctx->hook_data);
961 grub_ext2_dir (grub_device_t device, const char *path, grub_fs_dir_hook_t hook,
964 struct grub_ext2_dir_ctx ctx = {
966 .hook_data = hook_data
968 struct grub_fshelp_node *fdiro = 0;
970 grub_dl_ref (my_mod);
972 ctx.data = grub_ext2_mount (device->disk);
976 grub_fshelp_find_file (path, &ctx.data->diropen, &fdiro,
977 grub_ext2_iterate_dir, grub_ext2_read_symlink,
982 grub_ext2_iterate_dir (fdiro, grub_ext2_dir_iter, &ctx);
985 if (fdiro != &ctx.data->diropen)
987 grub_free (ctx.data);
989 grub_dl_unref (my_mod);
995 grub_ext2_label (grub_device_t device, char **label)
997 struct grub_ext2_data *data;
998 grub_disk_t disk = device->disk;
1000 grub_dl_ref (my_mod);
1002 data = grub_ext2_mount (disk);
1004 *label = grub_strndup (data->sblock.volume_name,
1005 sizeof (data->sblock.volume_name));
1009 grub_dl_unref (my_mod);
1017 grub_ext2_uuid (grub_device_t device, char **uuid)
1019 struct grub_ext2_data *data;
1020 grub_disk_t disk = device->disk;
1022 grub_dl_ref (my_mod);
1024 data = grub_ext2_mount (disk);
1027 *uuid = grub_xasprintf ("%04x%04x-%04x-%04x-%04x-%04x%04x%04x",
1028 grub_be_to_cpu16 (data->sblock.uuid[0]),
1029 grub_be_to_cpu16 (data->sblock.uuid[1]),
1030 grub_be_to_cpu16 (data->sblock.uuid[2]),
1031 grub_be_to_cpu16 (data->sblock.uuid[3]),
1032 grub_be_to_cpu16 (data->sblock.uuid[4]),
1033 grub_be_to_cpu16 (data->sblock.uuid[5]),
1034 grub_be_to_cpu16 (data->sblock.uuid[6]),
1035 grub_be_to_cpu16 (data->sblock.uuid[7]));
1040 grub_dl_unref (my_mod);
1049 grub_ext2_mtime (grub_device_t device, grub_int32_t *tm)
1051 struct grub_ext2_data *data;
1052 grub_disk_t disk = device->disk;
1054 grub_dl_ref (my_mod);
1056 data = grub_ext2_mount (disk);
1060 *tm = grub_le_to_cpu32 (data->sblock.utime);
1062 grub_dl_unref (my_mod);
1072 static struct grub_fs grub_ext2_fs =
1075 .dir = grub_ext2_dir,
1076 .open = grub_ext2_open,
1077 .read = grub_ext2_read,
1078 .close = grub_ext2_close,
1079 .label = grub_ext2_label,
1080 .uuid = grub_ext2_uuid,
1081 .mtime = grub_ext2_mtime,
1083 .reserved_first_sector = 1,
1084 .blocklist_install = 1,
1091 grub_fs_register (&grub_ext2_fs);
1097 grub_fs_unregister (&grub_ext2_fs);