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Added lfs_fs_size for finding a count of used blocks

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This has existed for some time in the form of the lfs_traverse
function, through which a user could provide a simple callback that
would just count the number of blocks lfs_traverse finds. However,
this approach is relatively unconventional and has proven to be confusing
for most users.
This commit is contained in:
Christopher Haster
2018-04-08 22:25:58 -05:00
parent 93244a3734
commit 746b90965c
2 changed files with 24 additions and 0 deletions
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16
lfs.c
View File

@@ -3183,3 +3183,19 @@ int lfs_fs_setattrs(lfs_t *lfs, const struct lfs_attr *attrs, int count) {
return lfs_dir_setattrs(lfs, &dir, &entry, attrs, count); return lfs_dir_setattrs(lfs, &dir, &entry, attrs, count);
} }
static int lfs_fs_size_count(void *p, lfs_block_t block) {
lfs_size_t *size = p;
*size += 1;
return 0;
}
lfs_ssize_t lfs_fs_size(lfs_t *lfs) {
lfs_size_t size = 0;
int err = lfs_traverse(lfs, lfs_fs_size_count, &size);
if (err) {
return err;
}
return size;
}

8
lfs.h
View File

@@ -590,6 +590,14 @@ int lfs_fs_getattrs(lfs_t *lfs, const struct lfs_attr *attrs, int count);
// Returns a negative error code on failure. // Returns a negative error code on failure.
int lfs_fs_setattrs(lfs_t *lfs, const struct lfs_attr *attrs, int count); int lfs_fs_setattrs(lfs_t *lfs, const struct lfs_attr *attrs, int count);
// Finds the current size of the filesystem
//
// Note: Result is best effort. If files share COW structures, the returned
// size may be larger than the filesystem actually is.
//
// Returns the number of allocated blocks, or a negative error code on failure.
lfs_ssize_t lfs_fs_size(lfs_t *lfs);
/// Miscellaneous littlefs specific operations /// /// Miscellaneous littlefs specific operations ///