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Fixed issues found by more aggressive rename tests

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- Fixed underflow issue caused by search id shortcuts that would result
  in early termination from lfs_dir_get
- Fixed issue where entry file delete would toss out the best id during
  lfs_dir_fetchmatch
- Fixed globals going out of date when canceling in same metadata-pair
- Fixed early removal of metadata-pair when attribute list contains
  creates after deletes bring dir->count to zero
This commit is contained in:
Christopher Haster
2018-10-21 11:25:48 -05:00
parent c8a39c4b23
commit 4a1b8ae222
1 changed files with 31 additions and 19 deletions
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50
lfs.c
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@@ -518,7 +518,10 @@ static int lfs_dir_traverse(lfs_t *lfs,
if (lfs_tag_subtype(tag) == LFS_TYPE_CRC) {
lastcommit = 2 & lfs_tag_type(tag);
} else if (lfs_tag_subtype(tag) == LFS_TYPE_DELETE) {
}
if (lfs_tag_id(matchmask) != 0 &&
lfs_tag_subtype(tag) == LFS_TYPE_DELETE) {
// something was deleted, need to move around it
if (lfs_tag_id(tag) <= lfs_tag_id(matchtag - matchdiff)) {
matchdiff -= LFS_MKTAG(0, 1, 0);
@@ -533,11 +536,13 @@ static int lfs_dir_traverse(lfs_t *lfs,
}
}
if (lfs_tag_subtype(tag) == LFS_TYPE_CREATE) {
if (lfs_tag_id(matchmask) != 0 &&
lfs_tag_subtype(tag) == LFS_TYPE_CREATE) {
// found where something was created
if (lfs_tag_id(tag) == lfs_tag_id(matchtag - matchdiff)) {
break;
} else if (lfs_tag_id(tag) < lfs_tag_id(matchtag - matchdiff)) {
} else if (lfs_tag_id(tag) <
lfs_tag_id(matchtag - matchdiff)) {
matchdiff += LFS_MKTAG(0, 1, 0);
}
}
@@ -686,7 +691,7 @@ static lfs_stag_t lfs_dir_fetchmatch(lfs_t *lfs,
LFS_ASSERT(temp.count > 0);
temp.count -= 1;
if (tempfoundtag &&
if (tempfoundtag && !lfs_tag_isdelete(tempfoundtag) &&
lfs_tag_id(tag) == lfs_tag_id(tempfoundtag)) {
tempfoundtag = 0;
} else if (tempfoundtag &&
@@ -1390,7 +1395,8 @@ commit:
}
// commit with a move
for (uint16_t id = begin; id < end || commit.off < commit.ack; id++) {
for (uint16_t id = begin;
id < end || commit.off < commit.ack; id++) {
for (int pass = 0; pass < 2; pass++) {
err = lfs_commit_move(lfs, &commit, pass,
0x003fe000, LFS_MKTAG(0, id, 0),
@@ -1556,6 +1562,7 @@ relocate:
static int lfs_dir_commit(lfs_t *lfs, lfs_mdir_t *dir,
const struct lfs_mattr *attrs) {
// check for globals work
struct lfs_mattr cancelattr;
struct lfs_globals cancels;
lfs_global_zero(&cancels);
@@ -1564,7 +1571,7 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_mdir_t *dir,
// Wait, we have the move? Just cancel this out here
// We need to, or else the move can become outdated
cancelattr.tag = LFS_MKTAG(LFS_TYPE_DELETE, lfs->globals.id, 0);
cancelattr.next = attrs; // TODO need order
cancelattr.next = attrs;
attrs = &cancelattr;
cancels.hasmove = lfs->globals.hasmove;
@@ -1584,28 +1591,33 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_mdir_t *dir,
if (lfs_tag_subtype(a->tag) == LFS_TYPE_CREATE) {
dir->count += 1;
createtag = a->tag;
// Oh no, did we tweak globals? We need to fix that too
if (lfs_tag_id(a->tag) <= lfs_tag_id(cancelattr.tag)) {
cancelattr.tag += LFS_MKTAG(0, 1, 0);
}
} else if (lfs_tag_subtype(a->tag) == LFS_TYPE_DELETE) {
LFS_ASSERT(dir->count > 0);
dir->count -= 1;
deletetag = a->tag;
if (dir->count == 0) {
// should we actually drop the directory block?
lfs_mdir_t pdir;
int err = lfs_fs_pred(lfs, dir->pair, &pdir);
if (err && err != LFS_ERR_NOENT) {
return err;
}
if (err != LFS_ERR_NOENT && pdir.split) {
return lfs_dir_drop(lfs, &pdir, dir);
}
}
}
attrcount += 1;
}
// should we actually drop the directory block?
if (lfs_tag_isvalid(deletetag) && dir->count == 0) {
lfs_mdir_t pdir;
int err = lfs_fs_pred(lfs, dir->pair, &pdir);
if (err && err != LFS_ERR_NOENT) {
return err;
}
if (err != LFS_ERR_NOENT && pdir.split) {
return lfs_dir_drop(lfs, &pdir, dir);
}
}
if (dir->erased) {
// try to commit
struct lfs_commit commit = {