Backport ext2

2020-02-03 12:56:53 +02:00
parent bd023a1873
commit fbdb44b71d
10 changed files with 941 additions and 72 deletions
@@ -0,0 +1,7 @@
+#pragma once
+#include "sys/types.h"
+
+struct blkdev;
+struct vnode;
+
+int blk_enumerate_gpt(struct blkdev *dev, struct vnode *of, uint8_t *head);
@@ -0,0 +1,17 @@
+#pragma once
+#include "sys/types.h"
+
+struct ext2_inode;
+struct fs;
+
+int ext2_read_superblock(struct fs *ext2);
+int ext2_write_superblock(struct fs *ext2);
+
+int ext2_read_block(struct fs *ext2, void *blk, uint32_t no);
+
+int ext2_read_inode_block(struct fs *ext2, struct ext2_inode *inode, void *block, uint32_t index);
+
+int ext2_read_inode(struct fs *ext2, struct ext2_inode *dst, uint32_t ino);
+// NOTE: this function automatically updates access and modification time
+//       on the inode written
+int ext2_write_inode(struct fs *ext2, struct ext2_inode *node, uint32_t ino);
@@ -0,0 +1,146 @@
+#pragma once
+#include "sys/types.h"
+
+#define EXT2_FLAG_RO            (1 << 0)
+
+#define EXT2_STATE_CLEAN        1
+#define EXT2_STATE_DIRTY        2
+
+#define EXT2_ERROR_IGNORE       1
+#define EXT2_ERROR_READONLY     2
+#define EXT2_ERROR_PANIC        3
+
+#define EXT2_REQ_COMP           (1 << 0)
+#define EXT2_REQ_ENT_TYPE       (1 << 1)
+#define EXT2_REQ_REPLAY_JOURNAL (1 << 2)
+#define EXT2_REQ_JOURNAL_DEV    (1 << 3)
+
+#define EXT2_RO_SPARSE_SB       (1 << 0)
+#define EXT2_RO_64BIT_SIZE      (1 << 1)
+#define EXT2_RO_DIR_BTREE       (1 << 2)
+
+#define EXT2_SIGNATURE          0xEF53
+
+#define EXT2_IFIFO              0x1000
+#define EXT2_IFCHR              0x2000
+#define EXT2_IFDIR              0x4000
+#define EXT2_IFBLK              0x6000
+#define EXT2_IFREG              0x8000
+#define EXT2_IFLNK              0xA000
+#define EXT2_IFSOCK             0xC000
+
+struct vnode;
+
+struct ext2_superblock {
+    // Base superblock
+    uint32_t inode_count;
+    uint32_t block_count;
+    uint32_t reserved_blocks;
+    uint32_t free_blocks;
+    uint32_t free_inodes;
+    uint32_t superblock_no;
+    uint32_t log2_block_size;
+    uint32_t log2_frag_size;
+    uint32_t block_group_blocks;
+    uint32_t block_group_frags;
+    uint32_t block_group_inodes;
+    uint32_t mount_time;
+    uint32_t write_time;
+    uint16_t mount_count;
+    uint16_t fsck_mount_count;
+    uint16_t ext2_signature;
+    uint16_t state;
+    uint16_t error_behavior;
+    uint16_t version_minor;
+    uint32_t fsck_time;
+    uint32_t fsck_interval;
+    uint32_t os_id;
+    uint32_t version_major;
+    uint16_t reserved_uid;
+    uint16_t reserved_gid;
+    // Extended superblock
+    uint32_t first_inode;                   // == 11 in < 1.0
+    uint16_t inode_size;                    // == 128 in < 1.0
+    uint16_t superblock_block_group;        // For backup
+    uint32_t optional_features;             // Don't matter
+    uint32_t required_features;             // Cannot read without these
+    uint32_t write_required_features;       // Can read without these
+    char filesystem_id[16];
+    char volume_name[16];
+    char last_mount_path[64];
+    uint32_t compression;
+    uint8_t prealloc_file_blocks;
+    uint8_t prealloc_dir_blocks;
+    uint16_t __res0;
+    char journal_id[16];
+    uint32_t journal_inode;
+    uint32_t journal_device;
+    uint32_t orphan_inode_list_head;
+} __attribute__((packed));
+
+struct ext2_blkgrp_desc {
+    uint32_t block_bitmap_no;
+    uint32_t inode_bitmap_no;
+    uint32_t inode_table_no;
+    uint16_t free_blocks;
+    uint16_t free_inodes;
+    uint16_t directory_count;
+    char __pad[14];
+} __attribute__((packed));
+
+struct ext2_inode {
+    uint16_t mode;
+    uint16_t uid;
+    uint32_t size_lower;
+    uint32_t atime;
+    uint32_t ctime;
+    uint32_t mtime;
+    uint32_t dtime;
+    uint16_t gid;
+    uint16_t hard_links;
+    uint32_t sector_count;
+    uint32_t flags;
+    uint32_t os_val1;
+    uint32_t direct_blocks[12];
+    uint32_t indirect_block_l1;
+    uint32_t indirect_block_l2;
+    uint32_t indirect_block_l3;
+    uint32_t generation;
+    uint32_t facl;
+    union {
+        uint32_t size_upper;
+        uint32_t dir_acl;
+    };
+    uint32_t frag_block_no;
+    uint32_t os_val2;
+} __attribute__((packed));
+
+struct ext2_dirent {
+    uint32_t ino;
+    uint16_t ent_size;
+    uint8_t name_length_low;
+    union {
+        uint8_t type_indicator;
+        uint8_t name_length_high;
+    };
+    char name[0];
+} __attribute__((packed));
+
+struct ext2_data {
+    union {
+        struct ext2_superblock sb;
+        char __data[1024];
+    };
+    struct ext2_blkgrp_desc *bgdt;
+
+    struct vnode *root;
+    struct ext2_inode *root_inode;
+
+    uint32_t flags;
+    uint32_t block_size;
+    uint32_t inode_size;
+    uint32_t inodes_per_block;
+    uint32_t blkgrp_inode_blocks;
+    uint32_t bgdt_entry_count;
+    uint32_t bgdt_size_blocks;
+};
@@ -0,0 +1,10 @@
+#pragma once
+#include "sys/types.h"
+
+struct vnode_operations;
+struct ext2_inode;
+struct vnode;
+
+extern struct vnode_operations g_ext2_vnode_ops;
+
+void ext2_inode_to_vnode(struct vnode *vnode, struct ext2_inode *inode, uint32_t ino);