df: support -t TYPE

function                                             old     new   delta
packed_usage                                       33656   33716     +60
df_main                                             1029    1065     +36
.rodata                                           103395  103397      +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/0 up/down: 98/0)               Total: 98 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 19 insertions, 12 deletions

diff --git a/coreutils/df.c b/coreutils/df.c
index a659353..e8d4bc8 100644
--- a/coreutils/df.c
+++ b/coreutils/df.c
@@ -45,7 +45,7 @@
 //usage:	IF_FEATURE_HUMAN_READABLE("mh")
 //usage:	"T"
 //usage:	IF_FEATURE_DF_FANCY("ai] [-B SIZE")
-//usage:	"] [FILESYSTEM]..."
+//usage:	"] [-t TYPE] [FILESYSTEM]..."
 //usage:#define df_full_usage "\n\n"
 //usage:       "Print filesystem usage statistics\n"
 //usage:     "\n	-P	POSIX output format"
@@ -55,6 +55,7 @@
 //usage:     "\n	-h	Human readable (e.g. 1K 243M 2G)"
 //usage:	)
 //usage:     "\n	-T	Print filesystem type"
+//usage:     "\n	-t TYPE	Print only mounts of this type"
 //usage:	IF_FEATURE_DF_FANCY(
 //usage:     "\n	-a	Show all filesystems"
 //usage:     "\n	-i	Inodes"
@@ -97,19 +98,19 @@ int df_main(int argc UNUSED_PARAM, char **argv)
 	FILE *mount_table;
 	struct mntent *mount_entry;
 	struct statvfs s;
-
 	enum {
-		OPT_KILO  = (1 << 0),
-		OPT_POSIX = (1 << 1),
-		OPT_FSTYPE  = (1 << 2),
-		OPT_ALL   = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
-		OPT_INODE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
-		OPT_BSIZE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
-		OPT_HUMAN = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
-		OPT_MEGA  = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
+		OPT_KILO   = (1 << 0),
+		OPT_POSIX  = (1 << 1),
+		OPT_FSTYPE = (1 << 2),
+		OPT_t      = (1 << 3),
+		OPT_ALL    = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
+		OPT_INODE  = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
+		OPT_BSIZE  = (1 << 6) * ENABLE_FEATURE_DF_FANCY,
+		OPT_HUMAN  = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
+		OPT_MEGA   = (1 << (5 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
 	};
 	const char *disp_units_hdr = NULL;
-	char *chp;
+	char *chp, *opt_t;
 
 	init_unicode();
 
@@ -121,7 +122,7 @@ int df_main(int argc UNUSED_PARAM, char **argv)
 		df_disp_hr = 512;
 
 	opt = getopt32(argv, "^"
-			"kPT"
+			"kPTt:"
 			IF_FEATURE_DF_FANCY("aiB:")
 			IF_FEATURE_HUMAN_READABLE("hm")
 			"\0"
@@ -130,6 +131,7 @@ int df_main(int argc UNUSED_PARAM, char **argv)
 #elif ENABLE_FEATURE_HUMAN_READABLE
 			"k-m:m-k"
 #endif
+			, &opt_t
 			IF_FEATURE_DF_FANCY(, &chp)
 	);
 	if (opt & OPT_MEGA)
@@ -214,6 +216,11 @@ int df_main(int argc UNUSED_PARAM, char **argv)
 		mount_point = mount_entry->mnt_dir;
 		fs_type = mount_entry->mnt_type;
 
+		if (opt & OPT_t) {
+			if (strcmp(fs_type, opt_t) != 0)
+				continue;
+		}
+
 		if (statvfs(mount_point, &s) != 0) {
 			bb_simple_perror_msg(mount_point);
 			goto set_error;