@@ -17,7 +17,7 @@ bindir = $(prefix)/bin
LIBS=-luuid
progs = btrfsctl mkfs.btrfs btrfs-debug-tree btrfs-show btrfs-vol btrfsck \
- btrfs-map-logical
+ btrfs-map-logical btrfs
# make C=1 to enable sparse
ifdef C
@@ -36,6 +36,10 @@ all: version $(progs) manpages
version:
bash version.sh
+btrfs: $(objects) btrfs.o btrfs_cmds.o
+ gcc $(CFLAGS) -o btrfs btrfs.o btrfs_cmds.o \
+ $(objects) $(LDFLAGS) $(LIBS)
+
btrfsctl: $(objects) btrfsctl.o
gcc $(CFLAGS) -o btrfsctl btrfsctl.o $(objects) $(LDFLAGS) $(LIBS)
new file mode 100644
@@ -0,0 +1,333 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "btrfs_cmds.h"
+#include "version.h"
+
+typedef int (*CommandFunction)(int argc, char **argv);
+
+struct Command {
+ CommandFunction func; /* function which implements the command */
+ int nargs; /* if == 999, any number of arguments
+ if >= 0, number of arguments,
+ if < 0, _minimum_ number of arguments */
+ char *verb; /* verb */
+ char *help; /* help lines; form the 2nd onward they are
+ indented */
+
+ /* the following fields are run-time filled by the program */
+ char **cmds; /* array of subcommands */
+ int ncmds; /* number of subcommand */
+};
+
+static struct Command commands[] = {
+
+ /*
+ avoid short commands different for the case only
+ */
+ { do_clone, 2,
+ "subvolume snapshot", "<source> [<dest>/]<name>\n"
+ "Create a writable snapshot of the subvolume <source> with\n"
+ "the name <name> in the <dest> directory."
+ },
+ { do_delete_subvolume, 1,
+ "subvolume delete", "<subvolume>\n"
+ "Delete the subvolume <subvolume>."
+ },
+ { do_create_subvol, 1,
+ "subvolume create", "[<dest>/]<name>\n"
+ "Create a subvolume in <dest> (or the current directory if\n"
+ "not passed)."
+ },
+ { do_defrag, -1,
+ "filesystem defragment", "<file>|<dir> [<file>|<dir>...]\n"
+ "Defragment a file or a directory."
+ },
+ { do_fssync, 1,
+ "filesystem sync", "<path>\n"
+ "Force a sync on the filesystem <path>."
+ },
+ { do_resize, 2,
+ "filesystem resize", "[+/-]<newsize>[gkm]|max <filesystem>\n"
+ "Resize the file system. If 'max' is passed, the filesystem\n"
+ "will occupe all available space on the device."
+ },
+ { do_show_filesystem, 999,
+ "filesystem show", "[<uuid>|<label>]\n"
+ "Show the info of a btrfs filesystem. If no <uuid> or <label>\n"
+ "is passed, info of all the btrfs filesystem are shown."
+ },
+ { do_balance, 1,
+ "filesystem balance", "<path>\n"
+ "Balance the chunks across the device."
+ },
+ { do_scan,
+ 999, "device scan", "[<device> [<device>..]\n"
+ "Scan all device for or the passed device for a btrfs\n"
+ "filesystem."
+ },
+ { do_add_volume, -1,
+ "device add", "<dev> [<dev>..] <path>\n"
+ "Add a device to a filesystem."
+ },
+ { do_remove_volume, -1,
+ "device delete", "<dev> [<dev>..] <path>\n"
+ "Remove a device from a filesystem."
+ },
+ /* coming soon
+ { 2, "filesystem label", "<label> <path>\n"
+ "Set the label of a filesystem"
+ }
+ { 1, "snapshot list", "<path>\n"
+ "List the snapshot/subvolume of a filesystem"
+ }
+ */
+
+ { 0, 0 , 0 }
+};
+
+static char *get_prgname(char *programname)
+{
+ char *np;
+ np = strrchr(programname,'/');
+ if(!np)
+ np = programname;
+ else
+ np++;
+
+ return np;
+}
+
+static void print_help(char *programname, struct Command *cmd)
+{
+ char *pc;
+
+ printf("\t%s %s ", programname, cmd->verb );
+
+ for(pc = cmd->help; *pc; pc++){
+ putchar(*pc);
+ if(*pc == '\n')
+ printf("\t\t");
+ }
+ putchar('\n');
+}
+
+static void help(char *np)
+{
+ struct Command *cp;
+
+ printf("Usage:\n");
+ for( cp = commands; cp->verb; cp++ )
+ print_help(np, cp);
+
+ printf("\n\t%s help|--help|-h\n\t\tShow the help.\n",np);
+ printf("\n%s\n", BTRFS_BUILD_VERSION);
+}
+
+static int split_command(char *cmd, char ***commands)
+{
+ int c, l;
+ char *p, *s;
+
+ for( *commands = 0, l = c = 0, p = s = cmd ; ; p++, l++ ){
+ if ( *p && *p != ' ' )
+ continue;
+ (*commands) = realloc( (*commands), sizeof(char *)*(c+1));
+ (*commands)[c] = strndup(s, l);
+ c++;
+ l = 0;
+ s = p+1;
+ if( !*p ) break;
+ }
+
+ (*commands)[c] = 0;
+ return c;
+}
+
+/*
+ This function checks if the passed command is ambiguous
+*/
+static int check_ambiguity(struct Command *cmd, char **argv){
+ int i;
+ struct Command *cp;
+ /* check for ambiguity */
+ for( i = 0 ; i < cmd->ncmds ; i++ ){
+ int match;
+ for( match = 0, cp = commands; cp->verb; cp++ ){
+ int j, skip;
+ char *s1, *s2;
+
+ if( cp->ncmds < i )
+ continue;
+
+ for( skip = 0, j = 0 ; j < i ; j++ )
+ if( strcmp(cmd->cmds[j], cp->cmds[j])){
+ skip=1;
+ break;
+ }
+ if(skip)
+ continue;
+
+ if( !strcmp(cmd->cmds[i], cp->cmds[i]))
+ continue;
+ for(s2 = cp->cmds[i], s1 = argv[i+1];
+ *s1 == *s2 && *s1; s1++, s2++ ) ;
+ if( !*s1 )
+ match++;
+ }
+ if(match){
+ int j;
+ fprintf(stderr, "ERROR: in command '");
+ for( j = 0 ; j <= i ; j++ )
+ fprintf(stderr, "%s%s",j?" ":"", argv[j+1]);
+ fprintf(stderr, "', '%s' is ambiguous\n",argv[j]);
+ return -2;
+ }
+ }
+ return 0;
+}
+
+/*
+
+ This function perform the following jobs:
+ - show the help if '--help' or 'help' or '-h' are passed
+ - verify that a ommand is not ambiguous, otherwise show which
+ parte of the command is ambiguous
+ - if after a (even partial) command there is '--help' show the help
+ for all the matching commands
+ - if the command doesn' match show an error
+ - finally, if a command match, they return which command is matched and
+ the arguments
+
+ The function return 0 in case of help is requested; <0 in case
+ of uncorrect command; >0 in case of matching commands
+ argc, argv are the arg-counter and arg-vector (input)
+ *nargs_ is the number of the argsuments after the command (output)
+ **cmd_ is the invoked command (output)
+ ***args_ are the arguments after the command
+
+*/
+static int parse_args(int argc, char **argv,
+ CommandFunction *func_,
+ int *nargs_, char **cmd_, char ***args_ )
+{
+ struct Command *cp;
+ struct Command *matchcmd=0;
+ char *prgname = get_prgname(argv[0]);
+ int i=0, helprequested=0;
+
+ if( argc < 2 || !strcmp(argv[1], "help") ||
+ !strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")){
+ help(prgname);
+ return 0;
+ }
+
+ for( cp = commands; cp->verb; cp++ )
+ if( !cp->ncmds)
+ cp->ncmds = split_command(cp->verb, &(cp->cmds));
+
+ for( cp = commands; cp->verb; cp++ ){
+ int match;
+
+ if( argc-1 < cp->ncmds )
+ continue;
+ for( match = 1, i = 0 ; i < cp->ncmds ; i++ ){
+ char *s1, *s2;
+ s1 = cp->cmds[i];
+ s2 = argv[i+1];
+
+ for(s2 = cp->cmds[i], s1 = argv[i+1];
+ *s1 == *s2 && *s1;
+ s1++, s2++ ) ;
+ if( *s1 ){
+ match=0;
+ break;
+ }
+ }
+
+ /* If you understand why this code works ...
+ you are a genious !! */
+ if(argc>i+1 && !strcmp(argv[i+1],"--help")){
+ if(!helprequested)
+ printf("Usage:\n");
+ print_help(prgname, cp);
+ helprequested=1;
+ continue;
+ }
+
+ if(!match)
+ continue;
+
+ matchcmd = cp;
+ *nargs_ = argc-matchcmd->ncmds-1;
+ *cmd_ = matchcmd->verb;
+ *args_ = argv+matchcmd->ncmds+1;
+ *func_ = cp->func;
+
+ break;
+ }
+
+ if(helprequested){
+ printf("\n%s\n", BTRFS_BUILD_VERSION);
+ return 0;
+ }
+
+ if(!matchcmd){
+ fprintf( stderr, "ERROR: unknow command '%s'\n",argv[1]);
+ help(prgname);
+ return -1;
+ }
+
+ if(check_ambiguity(matchcmd, argv))
+ return -2;
+
+ /* check the number of argument */
+ if (matchcmd->nargs < 0 && matchcmd->nargs < -*nargs_ ){
+ fprintf(stderr, "ERROR: '%s' requires minimum %d arg(s)\n",
+ matchcmd->verb, -matchcmd->nargs);
+ return -2;
+ }
+ if(matchcmd->nargs >= 0 && matchcmd->nargs != *nargs_ && matchcmd->nargs !=
999 ){
+ fprintf(stderr, "ERROR: '%s' requires %d arg(s)\n",
+ matchcmd->verb, matchcmd->nargs);
+ return -2;
+ }
+
+ return 1;
+}
+
+int main(int ac, char **av )
+{
+
+ char *cmd=0, **args=0;
+ int nargs=0, r;
+ CommandFunction func=0;
+
+ r = parse_args(ac, av, &func, &nargs, &cmd, &args);
+ if( r <= 0 ){
+ /* error or no command to parse*/
+ exit(-r);
+ }
+
+ exit(func(nargs, args));
+
+}