forked from luck/tmp_suning_uos_patched
f2fs: support ->rename2()
Now new interface ->rename2() is added to VFS, here are related description: https://lkml.org/lkml/2014/2/7/873 https://lkml.org/lkml/2014/2/7/758 This patch adds function f2fs_rename2() to support ->rename2() including handling both RENAME_EXCHANGE and RENAME_NOREPLACE flag. Signed-off-by: Chao Yu <chao2.yu@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
Jaegeuk Kim
parent
79e35dc3c2
commit
32f9bc25cb
164
fs/f2fs/namei.c
164
fs/f2fs/namei.c
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@ -485,6 +485,169 @@ static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
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return err;
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}
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static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry)
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{
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struct super_block *sb = old_dir->i_sb;
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struct f2fs_sb_info *sbi = F2FS_SB(sb);
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struct inode *old_inode = old_dentry->d_inode;
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struct inode *new_inode = new_dentry->d_inode;
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struct page *old_dir_page, *new_dir_page;
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struct page *old_page, *new_page;
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struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
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struct f2fs_dir_entry *old_entry, *new_entry;
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int old_nlink = 0, new_nlink = 0;
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int err = -ENOENT;
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f2fs_balance_fs(sbi);
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old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
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if (!old_entry)
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goto out;
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new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
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if (!new_entry)
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goto out_old;
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/* prepare for updating ".." directory entry info later */
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if (old_dir != new_dir) {
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if (S_ISDIR(old_inode->i_mode)) {
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err = -EIO;
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old_dir_entry = f2fs_parent_dir(old_inode,
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&old_dir_page);
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if (!old_dir_entry)
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goto out_new;
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}
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if (S_ISDIR(new_inode->i_mode)) {
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err = -EIO;
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new_dir_entry = f2fs_parent_dir(new_inode,
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&new_dir_page);
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if (!new_dir_entry)
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goto out_old_dir;
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}
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}
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/*
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* If cross rename between file and directory those are not
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* in the same directory, we will inc nlink of file's parent
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* later, so we should check upper boundary of its nlink.
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*/
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if ((!old_dir_entry || !new_dir_entry) &&
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old_dir_entry != new_dir_entry) {
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old_nlink = old_dir_entry ? -1 : 1;
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new_nlink = -old_nlink;
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err = -EMLINK;
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if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
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(new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
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goto out_new_dir;
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}
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f2fs_lock_op(sbi);
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err = update_dent_inode(old_inode, &new_dentry->d_name);
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if (err)
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goto out_unlock;
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err = update_dent_inode(new_inode, &old_dentry->d_name);
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if (err)
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goto out_undo;
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/* update ".." directory entry info of old dentry */
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if (old_dir_entry)
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f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
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/* update ".." directory entry info of new dentry */
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if (new_dir_entry)
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f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
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/* update directory entry info of old dir inode */
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f2fs_set_link(old_dir, old_entry, old_page, new_inode);
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down_write(&F2FS_I(old_inode)->i_sem);
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file_lost_pino(old_inode);
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up_write(&F2FS_I(old_inode)->i_sem);
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update_inode_page(old_inode);
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old_dir->i_ctime = CURRENT_TIME;
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if (old_nlink) {
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down_write(&F2FS_I(old_dir)->i_sem);
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if (old_nlink < 0)
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drop_nlink(old_dir);
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else
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inc_nlink(old_dir);
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up_write(&F2FS_I(old_dir)->i_sem);
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}
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mark_inode_dirty(old_dir);
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update_inode_page(old_dir);
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/* update directory entry info of new dir inode */
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f2fs_set_link(new_dir, new_entry, new_page, old_inode);
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down_write(&F2FS_I(new_inode)->i_sem);
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file_lost_pino(new_inode);
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up_write(&F2FS_I(new_inode)->i_sem);
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update_inode_page(new_inode);
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new_dir->i_ctime = CURRENT_TIME;
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if (new_nlink) {
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down_write(&F2FS_I(new_dir)->i_sem);
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if (new_nlink < 0)
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drop_nlink(new_dir);
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else
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inc_nlink(new_dir);
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up_write(&F2FS_I(new_dir)->i_sem);
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}
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mark_inode_dirty(new_dir);
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update_inode_page(new_dir);
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f2fs_unlock_op(sbi);
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return 0;
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out_undo:
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/* Still we may fail to recover name info of f2fs_inode here */
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update_dent_inode(old_inode, &old_dentry->d_name);
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out_unlock:
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f2fs_unlock_op(sbi);
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out_new_dir:
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if (new_dir_entry) {
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kunmap(new_dir_page);
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f2fs_put_page(new_dir_page, 0);
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}
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out_old_dir:
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if (old_dir_entry) {
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kunmap(old_dir_page);
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f2fs_put_page(old_dir_page, 0);
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}
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out_new:
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kunmap(new_page);
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f2fs_put_page(new_page, 0);
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out_old:
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kunmap(old_page);
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f2fs_put_page(old_page, 0);
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out:
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return err;
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}
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static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry,
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unsigned int flags)
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{
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if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
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return -EINVAL;
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if (flags & RENAME_EXCHANGE) {
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return f2fs_cross_rename(old_dir, old_dentry,
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new_dir, new_dentry);
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}
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/*
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* VFS has already handled the new dentry existence case,
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* here, we just deal with "RENAME_NOREPLACE" as regular rename.
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*/
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return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry);
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}
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static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
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{
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struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
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@ -542,6 +705,7 @@ const struct inode_operations f2fs_dir_inode_operations = {
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.rmdir = f2fs_rmdir,
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.mknod = f2fs_mknod,
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.rename = f2fs_rename,
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.rename2 = f2fs_rename2,
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.tmpfile = f2fs_tmpfile,
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.getattr = f2fs_getattr,
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.setattr = f2fs_setattr,
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