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Updated custom attribute documentation and tweaked nonexistant attributes

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Because of limitations in how littlefs manages attributes on disk,
littlefs views zero-length attributes and missing attributes as the same
thing. The simpliest implementation of attributes mirrors this behaviour
transparently for the user.
This commit is contained in:
Christopher Haster
2018-08-04 19:23:49 -05:00
parent f369f80540
commit a88230ae6a
3 changed files with 59 additions and 50 deletions
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lfs.c
+3 -9
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@@ -2651,14 +2651,11 @@ lfs_ssize_t lfs_getattr(lfs_t *lfs, const char *path,
res = lfs_dir_get(lfs, &cwd, 0x7ffff000,
LFS_MKTAG(0x100 | type, lfs_tagid(res),
lfs_min(size, lfs->attr_size)), buffer);
if (res < 0) {
if (res == LFS_ERR_NOENT) {
return LFS_ERR_NOATTR;
}
if (res < 0 && res != LFS_ERR_NOENT) {
return res;
}
return lfs_tagsize(res);
return (res == LFS_ERR_NOENT) ? 0 : lfs_tagsize(res);
}
int lfs_setattr(lfs_t *lfs, const char *path,
@@ -3270,13 +3267,10 @@ lfs_ssize_t lfs_fs_getattr(lfs_t *lfs,
LFS_MKTAG(0x100 | type, 0,
lfs_min(size, lfs->attr_size)), buffer);
if (res < 0) {
if (res == LFS_ERR_NOENT) {
return LFS_ERR_NOATTR;
}
return res;
}
return lfs_tagsize(res);
return (res == LFS_ERR_NOENT) ? 0 : lfs_tagsize(res);
}
int lfs_fs_setattr(lfs_t *lfs,