isa/make_ext4fs
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Implement support for block and char dev nodes, fifos and sockets.

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Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
This commit is contained in:
Jo-Philipp Wich 2015-04-04 23:01:57 +02:00
parent 62768dbac9
commit c657f39e16
3 changed files with 40 additions and 1 deletions
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34
contents.c
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@ -244,6 +244,40 @@ u32 make_link(const char *link)
return inode_num; return inode_num;
} }
/* Creates a special file on disk. Returns the inode number of the new file */
u32 make_special(const char *path)
{
struct ext4_inode *inode;
struct stat s;
u32 inode_num;
if (stat(path, &s)) {
error("failed to stat file\n");
return EXT4_ALLOCATE_FAILED;
}
inode_num = allocate_inode(info);
if (inode_num == EXT4_ALLOCATE_FAILED) {
error("failed to allocate inode\n");
return EXT4_ALLOCATE_FAILED;
}
inode = get_inode(inode_num);
if (inode == NULL) {
error("failed to get inode %u", inode_num);
return EXT4_ALLOCATE_FAILED;
}
inode->i_mode = s.st_mode & S_IFMT;
inode->i_links_count = 1;
inode->i_flags |= aux_info.default_i_flags;
((u8 *)inode->i_block)[0] = major(s.st_rdev);
((u8 *)inode->i_block)[1] = minor(s.st_rdev);
return inode_num;
}
int inode_set_permissions(u32 inode_num, u16 mode, u16 uid, u16 gid, u32 mtime) int inode_set_permissions(u32 inode_num, u16 mode, u16 uid, u16 gid, u32 mtime)
{ {
struct ext4_inode *inode = get_inode(inode_num); struct ext4_inode *inode = get_inode(inode_num);

1
contents.h
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@ -37,6 +37,7 @@ u32 make_directory(u32 dir_inode_num, u32 entries, struct dentry *dentries,
u32 dirs); u32 dirs);
u32 make_file(const char *filename, u64 len); u32 make_file(const char *filename, u64 len);
u32 make_link(const char *link); u32 make_link(const char *link);
u32 make_special(const char *path);
int inode_set_permissions(u32 inode_num, u16 mode, u16 uid, u16 gid, u32 mtime); int inode_set_permissions(u32 inode_num, u16 mode, u16 uid, u16 gid, u32 mtime);
int inode_set_selinux(u32 inode_num, const char *secon); int inode_set_selinux(u32 inode_num, const char *secon);
int inode_set_capabilities(u32 inode_num, uint64_t capabilities); int inode_set_capabilities(u32 inode_num, uint64_t capabilities);

6
make_ext4fs.c
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@ -44,7 +44,6 @@
/* TODO: Not implemented: /* TODO: Not implemented:
Allocating blocks in the same block group as the file inode Allocating blocks in the same block group as the file inode
Hash or binary tree directories Hash or binary tree directories
Special files: sockets, devices, fifos
*/ */
static int filter_dot(const struct dirent *d) static int filter_dot(const struct dirent *d)
@ -235,6 +234,11 @@ static u32 build_directory_structure(const char *full_path, const char *dir_path
free(subdir_dir_path); free(subdir_dir_path);
} else if (dentries[i].file_type == EXT4_FT_SYMLINK) { } else if (dentries[i].file_type == EXT4_FT_SYMLINK) {
entry_inode = make_link(dentries[i].link); entry_inode = make_link(dentries[i].link);
} else if (dentries[i].file_type == EXT4_FT_CHRDEV ||
dentries[i].file_type == EXT4_FT_BLKDEV ||
dentries[i].file_type == EXT4_FT_SOCK ||
dentries[i].file_type == EXT4_FT_FIFO) {
entry_inode = make_special(dentries[i].full_path);
} else { } else {
error("unknown file type on %s", dentries[i].path); error("unknown file type on %s", dentries[i].path);
entry_inode = 0; entry_inode = 0;