From: Josef Bacik <[email protected]> Send needs to send the decrypted value of the symlinks, handle the case where the inode is encrypted and decrypt the symlink name into a buffer and copy this buffer into our fs_path struct.
Signed-off-by: Josef Bacik <[email protected]> Signed-off-by: Daniel Vacek <[email protected]> --- v5: https://lore.kernel.org/linux-btrfs/4d97f35d6f85ff041b09bed33b63446a92b7a20c.1706116485.git.jo...@toxicpanda.com/ * read_symlink_encrypted() reworked from using pages to using folios. --- fs/btrfs/send.c | 45 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 42 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 3dcfdba018b5..b77f96ae2fea 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -1701,9 +1701,7 @@ static int find_extent_clone(struct send_ctx *sctx, return ret; } -static int read_symlink(struct btrfs_root *root, - u64 ino, - struct fs_path *dest) +static int read_symlink_unencrypted(struct btrfs_root *root, u64 ino, struct fs_path *dest) { int ret; BTRFS_PATH_AUTO_FREE(path); @@ -1764,6 +1762,47 @@ static int read_symlink(struct btrfs_root *root, return fs_path_add_from_extent_buffer(dest, path->nodes[0], off, len); } +static int read_symlink_encrypted(struct btrfs_root *root, u64 ino, struct fs_path *dest) +{ + DEFINE_DELAYED_CALL(done); + const char *buf; + struct folio *folio; + struct btrfs_inode *inode; + int ret = 0; + + inode = btrfs_iget(ino, root); + if (IS_ERR(inode)) + return PTR_ERR(inode); + + folio = read_mapping_folio(inode->vfs_inode.i_mapping, 0, NULL); + if (IS_ERR(folio)) { + iput(&inode->vfs_inode); + return PTR_ERR(folio); + } + + buf = fscrypt_get_symlink(&inode->vfs_inode, folio_address(folio), + BTRFS_MAX_INLINE_DATA_SIZE(root->fs_info), + &done); + folio_put(folio); + iput(&inode->vfs_inode); + + if (IS_ERR(buf)) + return PTR_ERR(buf); + + ret = fs_path_add(dest, buf, strlen(buf)); + do_delayed_call(&done); + return ret; +} + + +static int read_symlink(struct btrfs_root *root, u64 ino, + struct fs_path *dest) +{ + if (btrfs_fs_incompat(root->fs_info, ENCRYPT)) + return read_symlink_encrypted(root, ino, dest); + return read_symlink_unencrypted(root, ino, dest); +} + /* * Helper function to generate a file name that is unique in the root of * send_root and parent_root. This is used to generate names for orphan inodes. -- 2.51.0
