Process RENAME_EXCHANGE in affs_rename2() adding static
affs_xrename() based on affs_rename().
We remove headers from respective directories then
affect bh to other inode directory entries for swapping.
Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx>
---
fs/affs/namei.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 57 insertions(+), 1 deletion(-)
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 49a8dc1..46d3ace 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -441,17 +441,73 @@ affs_rename(struct inode *old_dir, struct dentry *old_dentry,
return retval;
}
+static int
+affs_xrename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+
+ struct super_block *sb = old_dir->i_sb;
+ struct buffer_head *bh_old = NULL;
+ struct buffer_head *bh_new = NULL;
+ int retval;
+
+ bh_old = affs_bread(sb, d_inode(old_dentry)->i_ino);
+ if (!bh_old)
+ return -EIO;
+
+ bh_new = affs_bread(sb, d_inode(new_dentry)->i_ino);
+ if (!bh_new)
+ return -EIO;
+
+ /* Remove old header from its parent directory. */
+ affs_lock_dir(old_dir);
+ retval = affs_remove_hash(old_dir, bh_old);
+ affs_unlock_dir(old_dir);
+ if (retval)
+ goto done;
+
+ /* Remove new header from its parent directory. */
+ affs_lock_dir(new_dir);
+ retval = affs_remove_hash(new_dir, bh_new);
+ affs_unlock_dir(new_dir);
+ if (retval)
+ goto done;
+
+ /* Insert old into the new directory with the new name. */
+ affs_copy_name(AFFS_TAIL(sb, bh_old)->name, new_dentry);
+ affs_fix_checksum(sb, bh_old);
+ affs_lock_dir(new_dir);
+ retval = affs_insert_hash(new_dir, bh_old);
+ affs_unlock_dir(new_dir);
+
+ /* Insert new into the old directory with the old name. */
+ affs_copy_name(AFFS_TAIL(sb, bh_new)->name, old_dentry);
+ affs_fix_checksum(sb, bh_new);
+ affs_lock_dir(old_dir);
+ retval = affs_insert_hash(old_dir, bh_new);
+ affs_unlock_dir(old_dir);
+done:
+ mark_buffer_dirty_inode(bh_old, new_dir);
+ mark_buffer_dirty_inode(bh_new, old_dir);
+ affs_brelse(bh_old);
+ affs_brelse(bh_new);
+ return retval;
+}
+
int affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
- if (flags & ~RENAME_NOREPLACE)
+ if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
return -EINVAL;
pr_debug("%s(old=%lu,\"%pd\" to new=%lu,\"%pd\")\n", __func__,
old_dir->i_ino, old_dentry, new_dir->i_ino, new_dentry);
+ if (flags & RENAME_EXCHANGE)
+ return affs_xrename(old_dir, old_dentry, new_dir, new_dentry);
+
return affs_rename(old_dir, old_dentry, new_dir, new_dentry);
}
--
2.9.3
