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Diffstat (limited to 'fs/ubifs/tnc.c')
-rw-r--r--fs/ubifs/tnc.c140
1 files changed, 113 insertions, 27 deletions
diff --git a/fs/ubifs/tnc.c b/fs/ubifs/tnc.c
index 709aa098dd46..0a213dcba2a1 100644
--- a/fs/ubifs/tnc.c
+++ b/fs/ubifs/tnc.c
@@ -1812,7 +1812,7 @@ static int do_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
int found, n, err;
struct ubifs_znode *znode;
- //dbg_tnck(key, "name '%.*s' key ", nm->len, nm->name);
+ dbg_tnck(key, "key ");
mutex_lock(&c->tnc_mutex);
found = ubifs_lookup_level0(c, key, &znode, &n);
if (!found) {
@@ -1880,48 +1880,65 @@ int ubifs_tnc_lookup_nm(struct ubifs_info *c, const union ubifs_key *key,
return do_lookup_nm(c, key, node, nm);
}
-static int do_lookup_dh(struct ubifs_info *c, const union ubifs_key *key,
- struct ubifs_dent_node *dent, uint32_t cookie)
+static int search_dh_cookie(struct ubifs_info *c, const union ubifs_key *key,
+ struct ubifs_dent_node *dent, uint32_t cookie,
+ struct ubifs_znode **zn, int *n)
{
- int n, err, type = key_type(c, key);
- struct ubifs_znode *znode;
+ int err;
+ struct ubifs_znode *znode = *zn;
struct ubifs_zbranch *zbr;
- union ubifs_key *dkey, start_key;
-
- ubifs_assert(is_hash_key(c, key));
-
- lowest_dent_key(c, &start_key, key_inum(c, key));
-
- mutex_lock(&c->tnc_mutex);
- err = ubifs_lookup_level0(c, &start_key, &znode, &n);
- if (unlikely(err < 0))
- goto out_unlock;
+ union ubifs_key *dkey;
for (;;) {
if (!err) {
- err = tnc_next(c, &znode, &n);
+ err = tnc_next(c, &znode, n);
if (err)
- goto out_unlock;
+ goto out;
}
- zbr = &znode->zbranch[n];
+ zbr = &znode->zbranch[*n];
dkey = &zbr->key;
if (key_inum(c, dkey) != key_inum(c, key) ||
- key_type(c, dkey) != type) {
+ key_type(c, dkey) != key_type(c, key)) {
err = -ENOENT;
- goto out_unlock;
+ goto out;
}
err = tnc_read_hashed_node(c, zbr, dent);
if (err)
- goto out_unlock;
+ goto out;
if (key_hash(c, key) == key_hash(c, dkey) &&
- le32_to_cpu(dent->cookie) == cookie)
- goto out_unlock;
+ le32_to_cpu(dent->cookie) == cookie) {
+ *zn = znode;
+ goto out;
+ }
}
+out:
+
+ return err;
+}
+
+static int do_lookup_dh(struct ubifs_info *c, const union ubifs_key *key,
+ struct ubifs_dent_node *dent, uint32_t cookie)
+{
+ int n, err;
+ struct ubifs_znode *znode;
+ union ubifs_key start_key;
+
+ ubifs_assert(is_hash_key(c, key));
+
+ lowest_dent_key(c, &start_key, key_inum(c, key));
+
+ mutex_lock(&c->tnc_mutex);
+ err = ubifs_lookup_level0(c, &start_key, &znode, &n);
+ if (unlikely(err < 0))
+ goto out_unlock;
+
+ err = search_dh_cookie(c, key, dent, cookie, &znode, &n);
+
out_unlock:
mutex_unlock(&c->tnc_mutex);
return err;
@@ -2393,8 +2410,7 @@ int ubifs_tnc_add_nm(struct ubifs_info *c, const union ubifs_key *key,
struct ubifs_znode *znode;
mutex_lock(&c->tnc_mutex);
- //dbg_tnck(key, "LEB %d:%d, name '%.*s', key ",
- // lnum, offs, nm->len, nm->name);
+ dbg_tnck(key, "LEB %d:%d, key ", lnum, offs);
found = lookup_level0_dirty(c, key, &znode, &n);
if (found < 0) {
err = found;
@@ -2628,7 +2644,7 @@ int ubifs_tnc_remove_nm(struct ubifs_info *c, const union ubifs_key *key,
struct ubifs_znode *znode;
mutex_lock(&c->tnc_mutex);
- //dbg_tnck(key, "%.*s, key ", nm->len, nm->name);
+ dbg_tnck(key, "key ");
err = lookup_level0_dirty(c, key, &znode, &n);
if (err < 0)
goto out_unlock;
@@ -2663,6 +2679,74 @@ out_unlock:
}
/**
+ * ubifs_tnc_remove_dh - remove an index entry for a "double hashed" node.
+ * @c: UBIFS file-system description object
+ * @key: key of node
+ * @cookie: node cookie for collision resolution
+ *
+ * Returns %0 on success or negative error code on failure.
+ */
+int ubifs_tnc_remove_dh(struct ubifs_info *c, const union ubifs_key *key,
+ uint32_t cookie)
+{
+ int n, err;
+ struct ubifs_znode *znode;
+ struct ubifs_dent_node *dent;
+ struct ubifs_zbranch *zbr;
+
+ if (!c->double_hash)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&c->tnc_mutex);
+ err = lookup_level0_dirty(c, key, &znode, &n);
+ if (err <= 0)
+ goto out_unlock;
+
+ zbr = &znode->zbranch[n];
+ dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
+ if (!dent) {
+ err = -ENOMEM;
+ goto out_unlock;
+ }
+
+ err = tnc_read_hashed_node(c, zbr, dent);
+ if (err)
+ goto out_free;
+
+ /* If the cookie does not match, we're facing a hash collision. */
+ if (le32_to_cpu(dent->cookie) != cookie) {
+ union ubifs_key start_key;
+
+ lowest_dent_key(c, &start_key, key_inum(c, key));
+
+ err = ubifs_lookup_level0(c, &start_key, &znode, &n);
+ if (unlikely(err < 0))
+ goto out_free;
+
+ err = search_dh_cookie(c, key, dent, cookie, &znode, &n);
+ if (err)
+ goto out_free;
+ }
+
+ if (znode->cnext || !ubifs_zn_dirty(znode)) {
+ znode = dirty_cow_bottom_up(c, znode);
+ if (IS_ERR(znode)) {
+ err = PTR_ERR(znode);
+ goto out_free;
+ }
+ }
+ err = tnc_delete(c, znode, n);
+
+out_free:
+ kfree(dent);
+out_unlock:
+ if (!err)
+ err = dbg_check_tnc(c, 0);
+ mutex_unlock(&c->tnc_mutex);
+ return err;
+}
+
+/**
* key_in_range - determine if a key falls within a range of keys.
* @c: UBIFS file-system description object
* @key: key to check
@@ -2802,6 +2886,8 @@ int ubifs_tnc_remove_ino(struct ubifs_info *c, ino_t inum)
dbg_tnc("xent '%s', ino %lu", xent->name,
(unsigned long)xattr_inum);
+ ubifs_evict_xattr_inode(c, xattr_inum);
+
fname_name(&nm) = xent->name;
fname_len(&nm) = le16_to_cpu(xent->nlen);
err = ubifs_tnc_remove_nm(c, &key1, &nm);
@@ -2863,7 +2949,7 @@ struct ubifs_dent_node *ubifs_tnc_next_ent(struct ubifs_info *c,
struct ubifs_zbranch *zbr;
union ubifs_key *dkey;
- //dbg_tnck(key, "%s ", nm->name ? (char *)nm->name : "(lowest)");
+ dbg_tnck(key, "key ");
ubifs_assert(is_hash_key(c, key));
mutex_lock(&c->tnc_mutex);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 17:59:58 +0100