summaryrefslogtreecommitdiff
path: root/target/linux/generic/pending-4.4/052-03-ubifs-Implement-RENAME_EXCHANGE.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/generic/pending-4.4/052-03-ubifs-Implement-RENAME_EXCHANGE.patch')
-rw-r--r--target/linux/generic/pending-4.4/052-03-ubifs-Implement-RENAME_EXCHANGE.patch267
1 files changed, 0 insertions, 267 deletions
diff --git a/target/linux/generic/pending-4.4/052-03-ubifs-Implement-RENAME_EXCHANGE.patch b/target/linux/generic/pending-4.4/052-03-ubifs-Implement-RENAME_EXCHANGE.patch
deleted file mode 100644
index 1830cd0..0000000
--- a/target/linux/generic/pending-4.4/052-03-ubifs-Implement-RENAME_EXCHANGE.patch
+++ /dev/null
@@ -1,267 +0,0 @@
-From: Richard Weinberger <richard@nod.at>
-Date: Tue, 13 Sep 2016 16:18:57 +0200
-Subject: [PATCH] ubifs: Implement RENAME_EXCHANGE
-
-Adds RENAME_EXCHANGE to UBIFS, the operation itself
-is completely disjunct from a regular rename() that's
-why we dispatch very early in ubifs_reaname().
-
-RENAME_EXCHANGE used by the renameat2() system call
-allows the caller to exchange two paths atomically.
-Both paths have to exist and have to be on the same
-filesystem.
-
-Signed-off-by: Richard Weinberger <richard@nod.at>
----
-
---- a/fs/ubifs/dir.c
-+++ b/fs/ubifs/dir.c
-@@ -1101,11 +1101,6 @@ static int ubifs_rename(struct inode *ol
- old_dentry, old_inode->i_ino, old_dir->i_ino,
- new_dentry, new_dir->i_ino, flags);
-
-- if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT))
-- return -EINVAL;
--
-- ubifs_assert(mutex_is_locked(&old_dir->i_mutex));
-- ubifs_assert(mutex_is_locked(&new_dir->i_mutex));
- if (unlink)
- ubifs_assert(mutex_is_locked(&new_inode->i_mutex));
-
-@@ -1290,6 +1285,64 @@ out_cancel:
- return err;
- }
-
-+static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
-+ struct inode *new_dir, struct dentry *new_dentry)
-+{
-+ struct ubifs_info *c = old_dir->i_sb->s_fs_info;
-+ struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
-+ .dirtied_ino = 2 };
-+ int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
-+ struct inode *fst_inode = d_inode(old_dentry);
-+ struct inode *snd_inode = d_inode(new_dentry);
-+ struct timespec time;
-+ int err;
-+
-+ ubifs_assert(fst_inode && snd_inode);
-+
-+ lock_4_inodes(old_dir, new_dir, NULL, NULL);
-+
-+ time = ubifs_current_time(old_dir);
-+ fst_inode->i_ctime = time;
-+ snd_inode->i_ctime = time;
-+ old_dir->i_mtime = old_dir->i_ctime = time;
-+ new_dir->i_mtime = new_dir->i_ctime = time;
-+
-+ if (old_dir != new_dir) {
-+ if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) {
-+ inc_nlink(new_dir);
-+ drop_nlink(old_dir);
-+ }
-+ else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) {
-+ drop_nlink(new_dir);
-+ inc_nlink(old_dir);
-+ }
-+ }
-+
-+ err = ubifs_jnl_xrename(c, old_dir, old_dentry, new_dir, new_dentry,
-+ sync);
-+
-+ unlock_4_inodes(old_dir, new_dir, NULL, NULL);
-+ ubifs_release_budget(c, &req);
-+
-+ return err;
-+}
-+
-+static int ubifs_rename2(struct inode *old_dir, struct dentry *old_dentry,
-+ struct inode *new_dir, struct dentry *new_dentry,
-+ unsigned int flags)
-+{
-+ if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE))
-+ return -EINVAL;
-+
-+ ubifs_assert(mutex_is_locked(&old_dir->i_mutex));
-+ ubifs_assert(mutex_is_locked(&new_dir->i_mutex));
-+
-+ if (flags & RENAME_EXCHANGE)
-+ return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);
-+
-+ return ubifs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
-+}
-+
- int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
- struct kstat *stat)
- {
-@@ -1338,7 +1391,7 @@ const struct inode_operations ubifs_dir_
- .mkdir = ubifs_mkdir,
- .rmdir = ubifs_rmdir,
- .mknod = ubifs_mknod,
-- .rename2 = ubifs_rename,
-+ .rename2 = ubifs_rename2,
- .setattr = ubifs_setattr,
- .getattr = ubifs_getattr,
- .setxattr = ubifs_setxattr,
---- a/fs/ubifs/journal.c
-+++ b/fs/ubifs/journal.c
-@@ -908,6 +908,147 @@ int ubifs_jnl_delete_inode(struct ubifs_
- }
-
- /**
-+ * ubifs_jnl_xrename - cross rename two directory entries.
-+ * @c: UBIFS file-system description object
-+ * @fst_dir: parent inode of 1st directory entry to exchange
-+ * @fst_dentry: 1st directory entry to exchange
-+ * @snd_dir: parent inode of 2nd directory entry to exchange
-+ * @snd_dentry: 2nd directory entry to exchange
-+ * @sync: non-zero if the write-buffer has to be synchronized
-+ *
-+ * This function implements the cross rename operation which may involve
-+ * writing 2 inodes and 2 directory entries. It marks the written inodes as clean
-+ * and returns zero on success. In case of failure, a negative error code is
-+ * returned.
-+ */
-+int ubifs_jnl_xrename(struct ubifs_info *c, const struct inode *fst_dir,
-+ const struct dentry *fst_dentry,
-+ const struct inode *snd_dir,
-+ const struct dentry *snd_dentry, int sync)
-+{
-+ union ubifs_key key;
-+ struct ubifs_dent_node *dent1, *dent2;
-+ int err, dlen1, dlen2, lnum, offs, len, plen = UBIFS_INO_NODE_SZ;
-+ int aligned_dlen1, aligned_dlen2;
-+ int twoparents = (fst_dir != snd_dir);
-+ const struct inode *fst_inode = d_inode(fst_dentry);
-+ const struct inode *snd_inode = d_inode(snd_dentry);
-+ void *p;
-+
-+ dbg_jnl("dent '%pd' in dir ino %lu between dent '%pd' in dir ino %lu",
-+ fst_dentry, fst_dir->i_ino, snd_dentry, snd_dir->i_ino);
-+
-+ ubifs_assert(ubifs_inode(fst_dir)->data_len == 0);
-+ ubifs_assert(ubifs_inode(snd_dir)->data_len == 0);
-+ ubifs_assert(mutex_is_locked(&ubifs_inode(fst_dir)->ui_mutex));
-+ ubifs_assert(mutex_is_locked(&ubifs_inode(snd_dir)->ui_mutex));
-+
-+ dlen1 = UBIFS_DENT_NODE_SZ + snd_dentry->d_name.len + 1;
-+ dlen2 = UBIFS_DENT_NODE_SZ + fst_dentry->d_name.len + 1;
-+ aligned_dlen1 = ALIGN(dlen1, 8);
-+ aligned_dlen2 = ALIGN(dlen2, 8);
-+
-+ len = aligned_dlen1 + aligned_dlen2 + ALIGN(plen, 8);
-+ if (twoparents)
-+ len += plen;
-+
-+ dent1 = kmalloc(len, GFP_NOFS);
-+ if (!dent1)
-+ return -ENOMEM;
-+
-+ /* Make reservation before allocating sequence numbers */
-+ err = make_reservation(c, BASEHD, len);
-+ if (err)
-+ goto out_free;
-+
-+ /* Make new dent for 1st entry */
-+ dent1->ch.node_type = UBIFS_DENT_NODE;
-+ dent_key_init_flash(c, &dent1->key, snd_dir->i_ino, &snd_dentry->d_name);
-+ dent1->inum = cpu_to_le64(fst_inode->i_ino);
-+ dent1->type = get_dent_type(fst_inode->i_mode);
-+ dent1->nlen = cpu_to_le16(snd_dentry->d_name.len);
-+ memcpy(dent1->name, snd_dentry->d_name.name, snd_dentry->d_name.len);
-+ dent1->name[snd_dentry->d_name.len] = '\0';
-+ zero_dent_node_unused(dent1);
-+ ubifs_prep_grp_node(c, dent1, dlen1, 0);
-+
-+ /* Make new dent for 2nd entry */
-+ dent2 = (void *)dent1 + aligned_dlen1;
-+ dent2->ch.node_type = UBIFS_DENT_NODE;
-+ dent_key_init_flash(c, &dent2->key, fst_dir->i_ino, &fst_dentry->d_name);
-+ dent2->inum = cpu_to_le64(snd_inode->i_ino);
-+ dent2->type = get_dent_type(snd_inode->i_mode);
-+ dent2->nlen = cpu_to_le16(fst_dentry->d_name.len);
-+ memcpy(dent2->name, fst_dentry->d_name.name, fst_dentry->d_name.len);
-+ dent2->name[fst_dentry->d_name.len] = '\0';
-+ zero_dent_node_unused(dent2);
-+ ubifs_prep_grp_node(c, dent2, dlen2, 0);
-+
-+ p = (void *)dent2 + aligned_dlen2;
-+ if (!twoparents)
-+ pack_inode(c, p, fst_dir, 1);
-+ else {
-+ pack_inode(c, p, fst_dir, 0);
-+ p += ALIGN(plen, 8);
-+ pack_inode(c, p, snd_dir, 1);
-+ }
-+
-+ err = write_head(c, BASEHD, dent1, len, &lnum, &offs, sync);
-+ if (err)
-+ goto out_release;
-+ if (!sync) {
-+ struct ubifs_wbuf *wbuf = &c->jheads[BASEHD].wbuf;
-+
-+ ubifs_wbuf_add_ino_nolock(wbuf, fst_dir->i_ino);
-+ ubifs_wbuf_add_ino_nolock(wbuf, snd_dir->i_ino);
-+ }
-+ release_head(c, BASEHD);
-+
-+ dent_key_init(c, &key, snd_dir->i_ino, &snd_dentry->d_name);
-+ err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen1, &snd_dentry->d_name);
-+ if (err)
-+ goto out_ro;
-+
-+ offs += aligned_dlen1;
-+ dent_key_init(c, &key, fst_dir->i_ino, &fst_dentry->d_name);
-+ err = ubifs_tnc_add_nm(c, &key, lnum, offs, dlen2, &fst_dentry->d_name);
-+ if (err)
-+ goto out_ro;
-+
-+ offs += aligned_dlen2;
-+
-+ ino_key_init(c, &key, fst_dir->i_ino);
-+ err = ubifs_tnc_add(c, &key, lnum, offs, plen);
-+ if (err)
-+ goto out_ro;
-+
-+ if (twoparents) {
-+ offs += ALIGN(plen, 8);
-+ ino_key_init(c, &key, snd_dir->i_ino);
-+ err = ubifs_tnc_add(c, &key, lnum, offs, plen);
-+ if (err)
-+ goto out_ro;
-+ }
-+
-+ finish_reservation(c);
-+
-+ mark_inode_clean(c, ubifs_inode(fst_dir));
-+ if (twoparents)
-+ mark_inode_clean(c, ubifs_inode(snd_dir));
-+ kfree(dent1);
-+ return 0;
-+
-+out_release:
-+ release_head(c, BASEHD);
-+out_ro:
-+ ubifs_ro_mode(c, err);
-+ finish_reservation(c);
-+out_free:
-+ kfree(dent1);
-+ return err;
-+}
-+
-+/**
- * ubifs_jnl_rename - rename a directory entry.
- * @c: UBIFS file-system description object
- * @old_dir: parent inode of directory entry to rename
---- a/fs/ubifs/ubifs.h
-+++ b/fs/ubifs/ubifs.h
-@@ -1544,6 +1544,10 @@ int ubifs_jnl_write_data(struct ubifs_in
- const union ubifs_key *key, const void *buf, int len);
- int ubifs_jnl_write_inode(struct ubifs_info *c, const struct inode *inode);
- int ubifs_jnl_delete_inode(struct ubifs_info *c, const struct inode *inode);
-+int ubifs_jnl_xrename(struct ubifs_info *c, const struct inode *fst_dir,
-+ const struct dentry *fst_dentry,
-+ const struct inode *snd_dir,
-+ const struct dentry *snd_dentry, int sync);
- int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
- const struct dentry *old_dentry,
- const struct inode *new_dir,
generated by cgit v1.1 at 2024-06-14 06:50:38 +0000