2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public
4 * License v2 as published by the Free Software Foundation.
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
9 * General Public License for more details.
11 * You should have received a copy of the GNU General Public
12 * License along with this program; if not, write to the
13 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
14 * Boston, MA 021110-1307, USA.
22 #include "kerncompat.h"
23 #include "btrfs_cmds.h"
27 #define ADVANCED_HELP 1
29 typedef int (*CommandFunction
)(int argc
, char **argv
);
32 CommandFunction func
; /* function which implements the command */
33 int nargs
; /* if == 999, any number of arguments
34 if >= 0, number of arguments,
35 if < 0, _minimum_ number of arguments */
36 char *verb
; /* verb */
37 char *help
; /* help lines; from the 2nd line onward they
38 are automatically indented */
39 char *adv_help
; /* advanced help message; from the 2nd line
40 onward they are automatically indented */
42 /* the following fields are run-time filled by the program */
43 char **cmds
; /* array of subcommands */
44 int ncmds
; /* number of subcommand */
47 static struct Command commands
[] = {
50 avoid short commands different for the case only
53 "subvolume snapshot", "[-r] <source> [<dest>/]<name>\n"
54 "Create a writable/readonly snapshot of the subvolume <source> with\n"
55 "the name <name> in the <dest> directory.",
58 { do_delete_subvolume
, 1,
59 "subvolume delete", "<subvolume>\n"
60 "Delete the subvolume <subvolume>.",
63 { do_create_subvol
, 1,
64 "subvolume create", "[<dest>/]<name>\n"
65 "Create a subvolume in <dest> (or the current directory if\n"
69 { do_subvol_list
, -1, "subvolume list", "[-p] <path>\n"
70 "List the snapshot/subvolume of a filesystem.",
72 "List the snapshot/subvolume of a filesystem.\n"
75 { do_set_default_subvol
, 2,
76 "subvolume set-default", "<id> <path>\n"
77 "Set the subvolume of the filesystem <path> which will be mounted\n"
81 { do_find_newer
, 2, "subvolume find-new", "<path> <last_gen>\n"
82 "List the recently modified files in a filesystem.",
86 "filesystem defragment", "[-vf] [-c[zlib,lzo]] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\n"
87 "Defragment a file or a directory.",
88 "[-vcf] [-s start] [-l len] [-t size] <file>|<dir> [<file>|<dir>...]\n"
89 "Defragment file data or directory metadata.\n"
91 "-c compress the file while defragmenting\n"
92 "-f flush data to disk immediately after defragmenting\n"
93 "-s start defragment only from byte onward\n"
94 "-l len defragment only up to len bytes\n"
95 "-t size minimal size of file to be considered for defragmenting\n"
97 { do_get_default_subvol
, 1, "subvolume get-default", "<path>\n"
98 "Get the default subvolume of a filesystem."
101 "filesystem sync", "<path>\n"
102 "Force a sync on the filesystem <path>.",
106 "filesystem resize", "[+/-]<newsize>[gkm]|max <filesystem>\n"
107 "Resize the file system. If 'max' is passed, the filesystem\n"
108 "will occupe all available space on the device.",
111 { do_show_filesystem
, 999,
112 "filesystem show", "[--all-devices][<uuid>|<label>]\n"
113 "Show the info of a btrfs filesystem. If no argument\n"
114 "is passed, info of all the btrfs filesystem are shown.",
117 { do_df_filesystem
, 1,
118 "filesystem df", "<path>\n"
119 "Show space usage information for a mount point.",
123 "filesystem balance", "<path>\n"
124 "Balance the chunks across the device.",
127 { do_change_label
, -1,
128 "filesystem label", "<device> [<newlabel>]\n"
129 "With one argument, get the label of filesystem on <device>.\n"
130 "If <newlabel> is passed, set the filesystem label to <newlabel>.\n"
131 "The filesystem must be unmounted.\n"
133 { do_scrub_start
, -1,
134 "scrub start", "[-Bdqr] <path>|<device>\n"
135 "Start a new scrub.",
136 "\n-B do not background\n"
137 "-d stats per device (-B only)\n"
139 "-r read only mode\n"
141 { do_scrub_cancel
, 1,
142 "scrub cancel", "<path>|<device>\n"
143 "Cancel a running scrub.",
146 { do_scrub_resume
, -1,
147 "scrub resume", "[-Bdqr] <path>|<device>\n"
148 "Resume previously canceled or interrupted scrub.",
151 { do_scrub_status
, -1,
152 "scrub status", "[-d] <path>|<device>\n"
153 "Show status of running or finished scrub.",
157 "device scan", "[<device>...]\n"
158 "Scan all device for or the passed device for a btrfs\n"
163 "device add", "<device> [<device>...] <path>\n"
164 "Add a device to a filesystem.",
167 { do_remove_volume
, -2,
168 "device delete", "<device> [<device>...] <path>\n"
169 "Remove a device from a filesystem.",
175 static char *get_prgname(char *programname
)
178 np
= strrchr(programname
,'/');
187 static void print_help(char *programname
, struct Command
*cmd
, int helptype
)
191 printf("\t%s %s ", programname
, cmd
->verb
);
193 if (helptype
== ADVANCED_HELP
&& cmd
->adv_help
)
194 for(pc
= cmd
->adv_help
; *pc
; pc
++){
200 for(pc
= cmd
->help
; *pc
; pc
++){
209 static void help(char *np
)
214 for( cp
= commands
; cp
->verb
; cp
++ )
215 print_help(np
, cp
, BASIC_HELP
);
217 printf("\n\t%s help|--help|-h\n\t\tShow the help.\n",np
);
218 printf("\n\t%s <cmd> --help\n\t\tShow detailed help for a command or\n\t\t"
219 "subset of commands.\n",np
);
220 printf("\n%s\n", BTRFS_BUILD_VERSION
);
223 static int split_command(char *cmd
, char ***commands
)
228 for( *commands
= 0, l
= c
= 0, p
= s
= cmd
; ; p
++, l
++ ){
229 if ( *p
&& *p
!= ' ' )
232 /* c + 2 so that we have room for the null */
233 (*commands
) = realloc( (*commands
), sizeof(char *)*(c
+ 2));
234 (*commands
)[c
] = strndup(s
, l
);
246 This function checks if the passed command is ambiguous
248 static int check_ambiguity(struct Command
*cmd
, char **argv
){
251 /* check for ambiguity */
252 for( i
= 0 ; i
< cmd
->ncmds
; i
++ ){
254 for( match
= 0, cp
= commands
; cp
->verb
; cp
++ ){
261 for( skip
= 0, j
= 0 ; j
< i
; j
++ )
262 if( strcmp(cmd
->cmds
[j
], cp
->cmds
[j
])){
269 if( !strcmp(cmd
->cmds
[i
], cp
->cmds
[i
]))
271 for(s2
= cp
->cmds
[i
], s1
= argv
[i
+1];
272 *s1
== *s2
&& *s1
; s1
++, s2
++ ) ;
278 fprintf(stderr
, "ERROR: in command '");
279 for( j
= 0 ; j
<= i
; j
++ )
280 fprintf(stderr
, "%s%s",j
?" ":"", argv
[j
+1]);
281 fprintf(stderr
, "', '%s' is ambiguous\n",argv
[j
]);
289 * This function, compacts the program name and the command in the first
290 * element of the '*av' array
292 static int prepare_args(int *ac
, char ***av
, char *prgname
, struct Command
*cmd
){
298 ret
= (char **)malloc(sizeof(char*)*(*ac
+1));
299 newname
= (char*)malloc(strlen(prgname
)+strlen(cmd
->verb
)+2);
300 if( !ret
|| !newname
){
307 for(i
=0; i
< *ac
; i
++ )
310 strcpy(newname
, prgname
);
311 strcat(newname
, " ");
312 strcat(newname
, cmd
->verb
);
324 This function performs the following jobs:
325 - show the help if '--help' or 'help' or '-h' are passed
326 - verify that a command is not ambiguous, otherwise show which
327 part of the command is ambiguous
328 - if after a (even partial) command there is '--help' show detailed help
329 for all the matching commands
330 - if the command doesn't match show an error
331 - finally, if a command matches, they return which command matched and
334 The function return 0 in case of help is requested; <0 in case
335 of uncorrect command; >0 in case of matching commands
336 argc, argv are the arg-counter and arg-vector (input)
337 *nargs_ is the number of the arguments after the command (output)
338 **cmd_ is the invoked command (output)
339 ***args_ are the arguments after the command
342 static int parse_args(int argc
, char **argv
,
343 CommandFunction
*func_
,
344 int *nargs_
, char **cmd_
, char ***args_
)
347 struct Command
*matchcmd
=0;
348 char *prgname
= get_prgname(argv
[0]);
349 int i
=0, helprequested
=0;
351 if( argc
< 2 || !strcmp(argv
[1], "help") ||
352 !strcmp(argv
[1], "-h") || !strcmp(argv
[1], "--help")){
357 for( cp
= commands
; cp
->verb
; cp
++ )
359 cp
->ncmds
= split_command(cp
->verb
, &(cp
->cmds
));
361 for( cp
= commands
; cp
->verb
; cp
++ ){
364 if( argc
-1 < cp
->ncmds
)
366 for( match
= 1, i
= 0 ; i
< cp
->ncmds
; i
++ ){
371 for(s2
= cp
->cmds
[i
], s1
= argv
[i
+1];
380 /* If you understand why this code works ...
381 you are a genious !! */
382 if(argc
>i
+1 && !strcmp(argv
[i
+1],"--help")){
385 print_help(prgname
, cp
, ADVANCED_HELP
);
394 *nargs_
= argc
-matchcmd
->ncmds
-1;
395 *cmd_
= matchcmd
->verb
;
396 *args_
= argv
+matchcmd
->ncmds
+1;
403 printf("\n%s\n", BTRFS_BUILD_VERSION
);
408 fprintf( stderr
, "ERROR: unknown command '%s'\n",argv
[1]);
413 if(check_ambiguity(matchcmd
, argv
))
416 /* check the number of argument */
417 if (matchcmd
->nargs
< 0 && matchcmd
->nargs
< -*nargs_
){
418 fprintf(stderr
, "ERROR: '%s' requires minimum %d arg(s)\n",
419 matchcmd
->verb
, -matchcmd
->nargs
);
422 if(matchcmd
->nargs
>= 0 && matchcmd
->nargs
!= *nargs_
&& matchcmd
->nargs
!= 999){
423 fprintf(stderr
, "ERROR: '%s' requires %d arg(s)\n",
424 matchcmd
->verb
, matchcmd
->nargs
);
428 if (prepare_args( nargs_
, args_
, prgname
, matchcmd
)){
429 fprintf(stderr
, "ERROR: not enough memory\\n");
436 int main(int ac
, char **av
)
439 char *cmd
=0, **args
=0;
441 CommandFunction func
=0;
443 r
= parse_args(ac
, av
, &func
, &nargs
, &cmd
, &args
);
445 /* error or no command to parse*/
449 exit(func(nargs
, args
));