From: Felix Fietkau <nbd@nbd.name> Date: Sat, 25 Apr 2015 12:41:32 +0200 Subject: [PATCH] jffs2: add RENAME_EXCHANGE support Signed-off-by: Felix Fietkau <nbd@nbd.name> --- --- a/fs/jffs2/dir.c +++ b/fs/jffs2/dir.c @@ -782,7 +782,7 @@ static int jffs2_rename (struct inode *o uint8_t type; uint32_t now; - if (flags & ~RENAME_WHITEOUT) + if (flags & ~(RENAME_WHITEOUT | RENAME_EXCHANGE)) return -EINVAL; /* The VFS will check for us and prevent trying to rename a @@ -790,7 +790,7 @@ static int jffs2_rename (struct inode *o * the VFS can't check whether the victim is empty. The filesystem * needs to do that for itself. */ - if (d_really_is_positive(new_dentry)) { + if (d_really_is_positive(new_dentry) && !(flags & RENAME_EXCHANGE)) { victim_f = JFFS2_INODE_INFO(d_inode(new_dentry)); if (d_is_dir(new_dentry)) { struct jffs2_full_dirent *fd; @@ -825,7 +825,7 @@ static int jffs2_rename (struct inode *o if (ret) return ret; - if (victim_f) { + if (victim_f && !(flags & RENAME_EXCHANGE)) { /* There was a victim. Kill it off nicely */ if (d_is_dir(new_dentry)) clear_nlink(d_inode(new_dentry)); @@ -851,6 +851,12 @@ static int jffs2_rename (struct inode *o if (flags & RENAME_WHITEOUT) /* Replace with whiteout */ ret = jffs2_whiteout(old_dir_i, old_dentry); + else if (flags & RENAME_EXCHANGE) + /* Replace the original */ + ret = jffs2_do_link(c, JFFS2_INODE_INFO(old_dir_i), + d_inode(new_dentry)->i_ino, type, + old_dentry->d_name.name, old_dentry->d_name.len, + now); else /* Unlink the original */ ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), @@ -882,7 +888,7 @@ static int jffs2_rename (struct inode *o return ret; } - if (d_is_dir(old_dentry)) + if (d_is_dir(old_dentry) && !(flags & RENAME_EXCHANGE)) drop_nlink(old_dir_i); new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);