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* util.c --- utilities for the debugfs program
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* Copyright (C) 1993, 1994 Theodore Ts'o. This file may be
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* redistributed under the terms of the GNU Public License.
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FILE *open_pager(void)
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const char *pager = getenv("PAGER");
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signal(SIGPIPE, SIG_IGN);
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if (strcmp(pager, "__none__") == 0) {
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outfile = popen(pager, "w");
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return (outfile ? outfile : stdout);
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void close_pager(FILE *stream)
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if (stream && stream != stdout) pclose(stream);
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* This routine is used whenever a command needs to turn a string into
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ext2_ino_t string_to_inode(char *str)
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int len = strlen(str);
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* If the string is of the form <ino>, then treat it as an
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if ((len > 2) && (str[0] == '<') && (str[len-1] == '>')) {
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ino = strtoul(str+1, &end, 0);
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retval = ext2fs_namei(current_fs, root, cwd, str, &ino);
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com_err(str, retval, "");
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* This routine returns 1 if the filesystem is not open, and prints an
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* error message to that effect.
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int check_fs_open(char *name)
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com_err(name, 0, "Filesystem not open");
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* This routine returns 1 if a filesystem is open, and prints an
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* error message to that effect.
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int check_fs_not_open(char *name)
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"Filesystem %s is still open. Close it first.\n",
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current_fs->device_name);
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* This routine returns 1 if a filesystem is not opened read/write,
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* and prints an error message to that effect.
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int check_fs_read_write(char *name)
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if (!(current_fs->flags & EXT2_FLAG_RW)) {
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com_err(name, 0, "Filesystem opened read/only");
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* This routine returns 1 if a filesystem is doesn't have its inode
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* and block bitmaps loaded, and prints an error message to that
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int check_fs_bitmaps(char *name)
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if (!current_fs->block_map || !current_fs->inode_map) {
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com_err(name, 0, "Filesystem bitmaps not loaded");
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* This function takes a __u32 time value and converts it to a string,
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char *time_to_string(__u32 cl)
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time_t t = (time_t) cl;
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* This function will convert a string to an unsigned long, printing
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* an error message if it fails, and returning success or failure in err.
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unsigned long parse_ulong(const char *str, const char *cmd,
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const char *descr, int *err)
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ret = strtoul(str, &tmp, 0);
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com_err(cmd, 0, "Bad %s - %s", descr, str);
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* This function will convert a string to a block number. It returns
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* 0 on success, 1 on failure.
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int strtoblk(const char *cmd, const char *str, blk_t *ret)
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blk = parse_ulong(str, cmd, "block number", &err);
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if (err == 0 && blk == 0) {
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com_err(cmd, 0, "Invalid block number 0");
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* This is a common helper function used by the command processing
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int common_args_process(int argc, char *argv[], int min_argc, int max_argc,
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const char *cmd, const char *usage, int flags)
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if (argc < min_argc || argc > max_argc) {
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com_err(argv[0], 0, "Usage: %s %s", cmd, usage);
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if (flags & CHECK_FS_NOTOPEN) {
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if (check_fs_not_open(argv[0]))
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if (check_fs_open(argv[0]))
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if ((flags & CHECK_FS_RW) && check_fs_read_write(argv[0]))
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if ((flags & CHECK_FS_BITMAPS) && check_fs_bitmaps(argv[0]))
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* This is a helper function used by do_stat, do_freei, do_seti, and
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* do_testi, etc. Basically, any command which takes a single
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* argument which is a file/inode number specifier.
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int common_inode_args_process(int argc, char *argv[],
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ext2_ino_t *inode, int flags)
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if (common_args_process(argc, argv, 2, 2, argv[0], "<file>", flags))
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*inode = string_to_inode(argv[1]);
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* This is a helper function used by do_freeb, do_setb, and do_testb
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int common_block_args_process(int argc, char *argv[],
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blk_t *block, int *count)
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if (common_args_process(argc, argv, 2, 3, argv[0],
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"<block> [count]", CHECK_FS_BITMAPS))
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if (strtoblk(argv[0], argv[1], block))
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*count = parse_ulong(argv[0], argv[2], "count", &err);
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int debugfs_read_inode(ext2_ino_t ino, struct ext2_inode * inode,
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retval = ext2fs_read_inode(current_fs, ino, inode);
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com_err(cmd, retval, "while reading inode %u", ino);
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int debugfs_write_inode(ext2_ino_t ino, struct ext2_inode * inode,
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retval = ext2fs_write_inode(current_fs, ino, inode);
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com_err(cmd, retval, "while writing inode %u", ino);