shell: mufs: add proper mounting and unmounting

include/fs/mufs.h

@@ -38,7 +38,8 @@ struct mufs_stat {
 #define MUFS_FILE BIT(0)
 #define MUFS_DIR  BIT(1)
 
-int mufs_mount(struct mufs *fs, struct flash_dev *dev);
+struct mufs *mufs_mount(struct flash_dev *dev);
+void mufs_unmount(struct mufs *fs);
 int mufs_format(struct flash_dev *dev);
 
 char *mufs_abspath(const char *path);

source/fs/mufs/super.c

@@ -17,18 +17,22 @@ struct mufs_super {
 	struct mufs_dtree root;
 } __attribute__((packed));
 
-int mufs_mount(struct mufs *fs, struct flash_dev *dev)
+struct mufs *mufs_mount(struct flash_dev *dev)
 {
 	struct mufs_super super;
+	struct mufs *fs;
 
-	if (!fs || !dev)
-		return -1;
+	if (!dev)
+		return NULL;
 
 	if (flash_read(dev, 0, &super, sizeof super) == 0)
-		return -1;
+		return NULL;
 
 	if (memcmp(super.magic, "mufs", 4) != 0)
-		return -1;
+		return NULL;
+
+	if (!(fs = malloc(sizeof *fs)))
+		return NULL;
 
 	fs->dev = dev;
 	fs->nblocks = super.nblocks;
@@ -40,7 +44,15 @@ int mufs_mount(struct mufs *fs, struct flash_dev *dev)
 	fs->root.root = super.root.root;
 	fs->root.depth = super.root.depth;
 
-	return 0;
+	return fs;
+}
+
+void mufs_unmount(struct mufs *fs)
+{
+	if (!fs)
+		return;
+
+	free(fs);
 }
 
 int mufs_format(struct flash_dev *dev)

source/shell/mufs.c

@@ -15,6 +15,7 @@
 #include <fs/mufs.h>
 
 static void do_mufs_mount(const char *s);
+static void do_mufs_unmount(const char *s);
 static void do_mufs_format(const char *s);
 static void do_mufs_mkdir(const char *s);
 static void do_mufs_rmdir(const char *s);
@@ -40,7 +41,7 @@ static struct cmd mufs_cmds[] = {
 };
 
 extern struct flash_dev *flash;
-struct mufs mufs;
+struct mufs *mufs;
 
 static void do_mufs_mount(const char *s)
 {
@@ -51,13 +52,30 @@ static void do_mufs_mount(const char *s)
 		return;
 	}
 
-	if (mufs_mount(&mufs, flash) < 0) {
+	do_mufs_unmount(NULL);
+
+	if (!(mufs = mufs_mount(flash))) {
 		fprintf(stderr, "error: unable to mount the filesystem.\n");
 		return;
 	}
 
-	printf("log2_nentries=%u\n", mufs.log2_nentries);
-	printf("nentries=%u\n", UINT32_C(1) << mufs.log2_nentries);
+	flash = NULL;
+}
+
+static void do_mufs_unmount(const char *s)
+{
+	(void)s;
+
+	if (!mufs)
+		return;
+
+	if (flash) {
+		flash_release(flash);
+		flash = mufs->dev;
+	}
+
+	mufs_unmount(mufs);
+	mufs = NULL;
 }
 
 static void do_mufs_format(const char *s)
@@ -77,7 +95,7 @@ static void do_mufs_format(const char *s)
 
 static void do_mufs_mkdir(const char *s)
 {
-	if (mufs_mkdir(&mufs, s) < 0) {
+	if (mufs_mkdir(mufs, s) < 0) {
 		fprintf(stderr, "error: unable to create the directory\n");
 		return;
 	}
@@ -85,7 +103,7 @@ static void do_mufs_mkdir(const char *s)
 
 static void do_mufs_rmdir(const char *s)
 {
-	if (mufs_rmdir(&mufs, s) < 0) {
+	if (mufs_rmdir(mufs, s) < 0) {
 		fprintf(stderr, "error: unable to remove the directory\n");
 		return;
 	}
@@ -95,7 +113,7 @@ static void do_mufs_stat(const char *s)
 {
 	struct mufs_stat stat;
 
-	if (mufs_stat(&mufs, s, &stat) < 0) {
+	if (mufs_stat(mufs, s, &stat) < 0) {
 		fprintf(stderr, "error: unable to stat the file\n");
 		return;
 	}
@@ -114,7 +132,7 @@ static void do_mufs_cat(const char *s)
 	char data[256];
 	struct mufs_file *file;
 
-	if (!(file = mufs_open(&mufs, s, MUFS_READ))) {
+	if (!(file = mufs_open(mufs, s, MUFS_READ))) {
 		fprintf(stderr, "error: unable to open the file\n");
 		return;
 	}
@@ -143,7 +161,7 @@ static void do_mufs_append(const char *s)
 
 	*line++ = '\0';
 
-	if (!(file = mufs_open(&mufs, path, MUFS_WRITE | MUFS_APPEND))) {
+	if (!(file = mufs_open(mufs, path, MUFS_WRITE | MUFS_APPEND))) {
 		fprintf(stderr, "error: unable to open the file\n");
 		goto err_free_path;
 	}
@@ -170,7 +188,7 @@ static void do_mufs_mv(const char *s)
 
 	*new++ = '\0';
 
-	if (mufs_rename(&mufs, old, new) < 0) {
+	if (mufs_rename(mufs, old, new) < 0) {
 		fprintf(stderr, "error: unable to move the file\n");
 		goto err_free_old;
 	}
@@ -181,7 +199,7 @@ err_free_old:
 
 static void do_mufs_rm(const char *s)
 {
-	if (mufs_unlink(&mufs, s) < 0) {
+	if (mufs_unlink(mufs, s) < 0) {
 		fprintf(stderr, "error: unable to remove the file\n");
 		return;
 	}
@@ -192,7 +210,7 @@ static void do_mufs_ls(const char *s)
 	struct mufs_dirent ent;
 	struct mufs_dir *dir;
 
-	if (!(dir = mufs_opendir(&mufs, s))) {
+	if (!(dir = mufs_opendir(mufs, s))) {
 		fprintf(stderr, "error: unable to open the directory\n");
 		return;
 	}