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fs: Add support for mount flags

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The flags field has been added to fs_mount_t structure, accompanied
with two new flags:
  FS_MOUNT_FLAG_READ_ONLY -- mount fs as read only
  FS_MOUNT_FLAG_NO_FORMAT -- do not format volume when system not found

Code supporting the flags has been added to FS layer and drivers for
LittleFS and FAT FS.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
This commit is contained in:
Dominik Ermel 2020-10-08 11:36:57 +00:00 • committed by Anas Nashif
commit aa0fd027fc
4 changed files with 34 additions and 3 deletions
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16
include/fs/fs.h
View file

@ -73,6 +73,11 @@ enum {
FS_TYPE_EXTERNAL_BASE,
};
/** Flag prevents formatting device if requested file system not found */
#define FS_MOUNT_FLAG_NO_FORMAT BIT(0)
/** Flag makes mounted file system read-only */
#define FS_MOUNT_FLAG_READ_ONLY BIT(1)
/**
* @brief File system mount info structure
*
@ -83,6 +88,7 @@ enum {
* @param storage_dev Pointer to backend storage device
* @param mountp_len Length of Mount point string
* @param fs Pointer to File system interface of the mount point
* @param flags Mount flags
*/
struct fs_mount_t {
sys_dnode_t node;
@ -93,6 +99,7 @@ struct fs_mount_t {
/* fields filled by file system core */
size_t mountp_len;
const struct fs_file_system_t *fs;
uint8_t flags;
};
/**
@ -201,6 +208,9 @@ struct fs_statvfs {
*
* @retval 0 on success;
* @retval -EINVAL when a bad file name is given;
* @retval -EROFS when opening read-only file for write, or attempting to
* create a file on a system that has been mounted with the
* FS_MOUNT_FLAG_READ_ONLY flag;
* @retval -ENOENT when the file path is not possible (bad mount point);
* @retval <0 an other negative errno code, depending on a file system back-end.
*/
@ -226,6 +236,8 @@ int fs_close(struct fs_file_t *zfp);
* @param path Path to the file or directory to delete
*
* @retval 0 on success;
* @retval -EROFS if file is read-only, or when file system has been mounted
* with the FS_MOUNT_FLAG_READ_ONLY flag;
* @retval -ENOTSUP when not implemented by underlying file system driver;
* @retval <0 an other negative errno code on error.
*/
@ -435,7 +447,9 @@ int fs_closedir(struct fs_dir_t *zdp);
* @retval 0 on success;
* @retval -ENOENT when file system type has not been registered;
* @retval -ENOTSUP when not supported by underlying file system driver;
* @retval <0 a other negative errno code on error.
* @retval -EROFS if system requires formatting but @c FS_MOUNT_FLAG_READ_ONLY
* has been set;
* @retval <0 an other negative errno code on error.
*/
int fs_mount(struct fs_mount_t *mp);