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fs: allow external file system implementations

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The documentation claims that Zephyr supports external file system
implementations, and there's no reason not to do so.  Rework the API
to allow this.

Note that the file system type cannot legally be an enum anymore,
since we need to support file system types that don't have an
identifier assigned in that enum.  Rely on the implicit conversion of
enum values to int to preserve backwards compatibility.

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This commit is contained in:
Peter A. Bigot 2020-06-01 12:08:58 -05:00 • committed by Carles Cufí
commit d0d3c4a3a7
4 changed files with 115 additions and 33 deletions
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32
include/fs/fs.h
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@ -45,12 +45,30 @@ enum fs_dir_entry_type {
FS_DIR_ENTRY_DIR
};
enum fs_type {
/** @brief Enumeration to uniquely identify file system types.
*
* Zephyr supports in-tree file systems and external ones. Each
* requires a unique identifier used to register the file system
* implementation and to associate a mount point with the file system
* type. This anonymous enum defines global identifiers for the
* in-tree file systems.
*
* External file systems should be registered using unique identifiers
* starting at @c FS_TYPE_EXTERNAL_BASE. It is the responsibility of
* applications that use external file systems to ensure that these
* identifiers are unique if multiple file system implementations are
* used by the application.
*/
enum {
/** Identifier for in-tree FatFS file system. */
FS_FATFS = 0,
FS_LITTLEFS,
FS_TYPE_END,
};
/** Identifier for in-tree LittleFS file system. */
FS_LITTLEFS,
/** Base identifier for external file systems. */
FS_TYPE_EXTERNAL_BASE,
};
/**
* @brief File system mount info structure
@ -65,7 +83,7 @@ enum fs_type {
*/
struct fs_mount_t {
sys_dnode_t node;
enum fs_type type;
int type;
const char *mnt_point;
void *fs_data;
void *storage_dev;
@ -494,7 +512,7 @@ int fs_statvfs(const char *path, struct fs_statvfs *stat);
* @retval 0 Success
* @retval -ERRNO errno code if error
*/
int fs_register(enum fs_type type, const struct fs_file_system_t *fs);
int fs_register(int type, const struct fs_file_system_t *fs);
/**
* @brief Unregister a file system
@ -507,7 +525,7 @@ int fs_register(enum fs_type type, const struct fs_file_system_t *fs);
* @retval 0 Success
* @retval -ERRNO errno code if error
*/
int fs_unregister(enum fs_type type, const struct fs_file_system_t *fs);
int fs_unregister(int type, const struct fs_file_system_t *fs);
/**
* @}