Patrick Williams | c124f4f | 2015-09-15 14:41:29 -0500 | [diff] [blame] | 1 | From ae7d33823bfc330e08b25c5fe4d25838ef7c77ce Mon Sep 17 00:00:00 2001 |
| 2 | From: Robert Yang <liezhi.yang@windriver.com> |
| 3 | Date: Mon, 23 Dec 2013 03:13:28 -0500 |
| 4 | Subject: [PATCH 03/11] misc/create_inode.c: create special file |
| 5 | |
| 6 | The do_mknod_internal() is used for creating special file which is |
| 7 | block, character and fifo, most of the code are from debugfs/debugfs.c, |
| 8 | the debugfs/debugfs.c will be modified to use this function. |
| 9 | |
| 10 | Upstream-Status: Backport |
| 11 | |
| 12 | Signed-off-by: Robert Yang <liezhi.yang@windriver.com> |
| 13 | Reviewed-by: Darren Hart <dvhart@linux.intel.com> |
| 14 | --- |
| 15 | misc/create_inode.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++ |
| 16 | 1 file changed, 72 insertions(+) |
| 17 | |
| 18 | diff --git a/misc/create_inode.c b/misc/create_inode.c |
| 19 | index b68b910..4da8aff 100644 |
| 20 | --- a/misc/create_inode.c |
| 21 | +++ b/misc/create_inode.c |
| 22 | @@ -11,6 +11,78 @@ |
| 23 | /* Make a special file which is block, character and fifo */ |
| 24 | errcode_t do_mknod_internal(ext2_ino_t cwd, const char *name, struct stat *st) |
| 25 | { |
| 26 | + ext2_ino_t ino; |
| 27 | + errcode_t retval; |
| 28 | + struct ext2_inode inode; |
| 29 | + unsigned long major, minor, mode; |
| 30 | + int filetype; |
| 31 | + |
| 32 | + switch(st->st_mode & S_IFMT) { |
| 33 | + case S_IFCHR: |
| 34 | + mode = LINUX_S_IFCHR; |
| 35 | + filetype = EXT2_FT_CHRDEV; |
| 36 | + break; |
| 37 | + case S_IFBLK: |
| 38 | + mode = LINUX_S_IFBLK; |
| 39 | + filetype = EXT2_FT_BLKDEV; |
| 40 | + break; |
| 41 | + case S_IFIFO: |
| 42 | + mode = LINUX_S_IFIFO; |
| 43 | + filetype = EXT2_FT_FIFO; |
| 44 | + break; |
| 45 | + } |
| 46 | + |
| 47 | + if (!(current_fs->flags & EXT2_FLAG_RW)) { |
| 48 | + com_err(__func__, 0, "Filesystem opened read/only"); |
| 49 | + return -1; |
| 50 | + } |
| 51 | + retval = ext2fs_new_inode(current_fs, cwd, 010755, 0, &ino); |
| 52 | + if (retval) { |
| 53 | + com_err(__func__, retval, 0); |
| 54 | + return retval; |
| 55 | + } |
| 56 | + |
| 57 | +#ifdef DEBUGFS |
| 58 | + printf("Allocated inode: %u\n", ino); |
| 59 | +#endif |
| 60 | + retval = ext2fs_link(current_fs, cwd, name, ino, filetype); |
| 61 | + if (retval == EXT2_ET_DIR_NO_SPACE) { |
| 62 | + retval = ext2fs_expand_dir(current_fs, cwd); |
| 63 | + if (retval) { |
| 64 | + com_err(__func__, retval, "while expanding directory"); |
| 65 | + return retval; |
| 66 | + } |
| 67 | + retval = ext2fs_link(current_fs, cwd, name, ino, filetype); |
| 68 | + } |
| 69 | + if (retval) { |
| 70 | + com_err(name, retval, 0); |
| 71 | + return -1; |
| 72 | + } |
| 73 | + if (ext2fs_test_inode_bitmap2(current_fs->inode_map, ino)) |
| 74 | + com_err(__func__, 0, "Warning: inode already set"); |
| 75 | + ext2fs_inode_alloc_stats2(current_fs, ino, +1, 0); |
| 76 | + memset(&inode, 0, sizeof(inode)); |
| 77 | + inode.i_mode = mode; |
| 78 | + inode.i_atime = inode.i_ctime = inode.i_mtime = |
| 79 | + current_fs->now ? current_fs->now : time(0); |
| 80 | + |
| 81 | + major = major(st->st_rdev); |
| 82 | + minor = minor(st->st_rdev); |
| 83 | + |
| 84 | + if ((major < 256) && (minor < 256)) { |
| 85 | + inode.i_block[0] = major * 256 + minor; |
| 86 | + inode.i_block[1] = 0; |
| 87 | + } else { |
| 88 | + inode.i_block[0] = 0; |
| 89 | + inode.i_block[1] = (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12); |
| 90 | + } |
| 91 | + inode.i_links_count = 1; |
| 92 | + |
| 93 | + retval = ext2fs_write_new_inode(current_fs, ino, &inode); |
| 94 | + if (retval) |
| 95 | + com_err(__func__, retval, "while creating inode %u", ino); |
| 96 | + |
| 97 | + return retval; |
| 98 | } |
| 99 | |
| 100 | /* Make a symlink name -> target */ |
| 101 | -- |
| 102 | 1.7.10.4 |
| 103 | |