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![Gabriel Krisman Bertazi](/assets/img/avatar_default.png)
Fix the following coverity warning reported by Dan Carpenter:
fs/ext4/namei.c:1311 ext4_fname_setup_ci_filename()
warn: 'cf_name->len' unsigned <= 0
Fixes: 3ae72562ad
("ext4: optimize case-insensitive lookups")
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
4030 lines
106 KiB
C
4030 lines
106 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/ext4/namei.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/namei.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* Big-endian to little-endian byte-swapping/bitmaps by
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* David S. Miller (davem@caip.rutgers.edu), 1995
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* Directory entry file type support and forward compatibility hooks
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* for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
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* Hash Tree Directory indexing (c)
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* Daniel Phillips, 2001
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* Hash Tree Directory indexing porting
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* Christopher Li, 2002
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* Hash Tree Directory indexing cleanup
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* Theodore Ts'o, 2002
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*/
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/time.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/quotaops.h>
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#include <linux/buffer_head.h>
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#include <linux/bio.h>
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#include <linux/iversion.h>
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#include <linux/unicode.h>
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#include "ext4.h"
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#include "ext4_jbd2.h"
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#include "xattr.h"
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#include "acl.h"
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#include <trace/events/ext4.h>
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/*
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* define how far ahead to read directories while searching them.
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*/
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#define NAMEI_RA_CHUNKS 2
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#define NAMEI_RA_BLOCKS 4
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#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
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static struct buffer_head *ext4_append(handle_t *handle,
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struct inode *inode,
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ext4_lblk_t *block)
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{
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struct buffer_head *bh;
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int err;
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if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
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((inode->i_size >> 10) >=
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EXT4_SB(inode->i_sb)->s_max_dir_size_kb)))
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return ERR_PTR(-ENOSPC);
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*block = inode->i_size >> inode->i_sb->s_blocksize_bits;
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bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE);
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if (IS_ERR(bh))
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return bh;
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inode->i_size += inode->i_sb->s_blocksize;
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EXT4_I(inode)->i_disksize = inode->i_size;
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BUFFER_TRACE(bh, "get_write_access");
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err = ext4_journal_get_write_access(handle, bh);
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if (err) {
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brelse(bh);
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ext4_std_error(inode->i_sb, err);
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return ERR_PTR(err);
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}
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return bh;
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}
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static int ext4_dx_csum_verify(struct inode *inode,
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struct ext4_dir_entry *dirent);
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/*
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* Hints to ext4_read_dirblock regarding whether we expect a directory
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* block being read to be an index block, or a block containing
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* directory entries (and if the latter, whether it was found via a
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* logical block in an htree index block). This is used to control
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* what sort of sanity checkinig ext4_read_dirblock() will do on the
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* directory block read from the storage device. EITHER will means
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* the caller doesn't know what kind of directory block will be read,
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* so no specific verification will be done.
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*/
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typedef enum {
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EITHER, INDEX, DIRENT, DIRENT_HTREE
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} dirblock_type_t;
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#define ext4_read_dirblock(inode, block, type) \
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__ext4_read_dirblock((inode), (block), (type), __func__, __LINE__)
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static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
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ext4_lblk_t block,
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dirblock_type_t type,
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const char *func,
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unsigned int line)
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{
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struct buffer_head *bh;
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struct ext4_dir_entry *dirent;
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int is_dx_block = 0;
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bh = ext4_bread(NULL, inode, block, 0);
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if (IS_ERR(bh)) {
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__ext4_warning(inode->i_sb, func, line,
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"inode #%lu: lblock %lu: comm %s: "
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"error %ld reading directory block",
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inode->i_ino, (unsigned long)block,
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current->comm, PTR_ERR(bh));
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return bh;
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}
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if (!bh && (type == INDEX || type == DIRENT_HTREE)) {
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ext4_error_inode(inode, func, line, block,
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"Directory hole found for htree %s block",
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(type == INDEX) ? "index" : "leaf");
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return ERR_PTR(-EFSCORRUPTED);
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}
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if (!bh)
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return NULL;
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dirent = (struct ext4_dir_entry *) bh->b_data;
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/* Determine whether or not we have an index block */
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if (is_dx(inode)) {
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if (block == 0)
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is_dx_block = 1;
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else if (ext4_rec_len_from_disk(dirent->rec_len,
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inode->i_sb->s_blocksize) ==
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inode->i_sb->s_blocksize)
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is_dx_block = 1;
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}
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if (!is_dx_block && type == INDEX) {
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ext4_error_inode(inode, func, line, block,
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"directory leaf block found instead of index block");
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brelse(bh);
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return ERR_PTR(-EFSCORRUPTED);
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}
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if (!ext4_has_metadata_csum(inode->i_sb) ||
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buffer_verified(bh))
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return bh;
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/*
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* An empty leaf block can get mistaken for a index block; for
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* this reason, we can only check the index checksum when the
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* caller is sure it should be an index block.
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*/
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if (is_dx_block && type == INDEX) {
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if (ext4_dx_csum_verify(inode, dirent))
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set_buffer_verified(bh);
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else {
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ext4_error_inode(inode, func, line, block,
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"Directory index failed checksum");
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brelse(bh);
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return ERR_PTR(-EFSBADCRC);
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}
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}
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if (!is_dx_block) {
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if (ext4_dirblock_csum_verify(inode, bh))
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set_buffer_verified(bh);
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else {
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ext4_error_inode(inode, func, line, block,
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"Directory block failed checksum");
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brelse(bh);
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return ERR_PTR(-EFSBADCRC);
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}
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}
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return bh;
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}
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#ifndef assert
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#define assert(test) J_ASSERT(test)
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#endif
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#ifdef DX_DEBUG
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#define dxtrace(command) command
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#else
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#define dxtrace(command)
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#endif
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struct fake_dirent
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{
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__le32 inode;
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__le16 rec_len;
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u8 name_len;
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u8 file_type;
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};
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struct dx_countlimit
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{
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__le16 limit;
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__le16 count;
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};
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struct dx_entry
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{
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__le32 hash;
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__le32 block;
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};
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/*
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* dx_root_info is laid out so that if it should somehow get overlaid by a
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* dirent the two low bits of the hash version will be zero. Therefore, the
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* hash version mod 4 should never be 0. Sincerely, the paranoia department.
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*/
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struct dx_root
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{
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struct fake_dirent dot;
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char dot_name[4];
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struct fake_dirent dotdot;
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char dotdot_name[4];
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struct dx_root_info
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{
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__le32 reserved_zero;
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u8 hash_version;
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u8 info_length; /* 8 */
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u8 indirect_levels;
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u8 unused_flags;
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}
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info;
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struct dx_entry entries[0];
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};
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struct dx_node
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{
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struct fake_dirent fake;
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struct dx_entry entries[0];
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};
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struct dx_frame
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{
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struct buffer_head *bh;
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struct dx_entry *entries;
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struct dx_entry *at;
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};
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struct dx_map_entry
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{
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u32 hash;
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u16 offs;
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u16 size;
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};
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/*
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* This goes at the end of each htree block.
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*/
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struct dx_tail {
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u32 dt_reserved;
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__le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */
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};
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static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
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static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
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static inline unsigned dx_get_hash(struct dx_entry *entry);
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static void dx_set_hash(struct dx_entry *entry, unsigned value);
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static unsigned dx_get_count(struct dx_entry *entries);
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static unsigned dx_get_limit(struct dx_entry *entries);
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static void dx_set_count(struct dx_entry *entries, unsigned value);
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static void dx_set_limit(struct dx_entry *entries, unsigned value);
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static unsigned dx_root_limit(struct inode *dir, unsigned infosize);
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static unsigned dx_node_limit(struct inode *dir);
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static struct dx_frame *dx_probe(struct ext4_filename *fname,
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struct inode *dir,
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struct dx_hash_info *hinfo,
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struct dx_frame *frame);
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static void dx_release(struct dx_frame *frames);
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static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
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unsigned blocksize, struct dx_hash_info *hinfo,
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struct dx_map_entry map[]);
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static void dx_sort_map(struct dx_map_entry *map, unsigned count);
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static struct ext4_dir_entry_2 *dx_move_dirents(char *from, char *to,
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struct dx_map_entry *offsets, int count, unsigned blocksize);
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static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize);
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static void dx_insert_block(struct dx_frame *frame,
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u32 hash, ext4_lblk_t block);
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static int ext4_htree_next_block(struct inode *dir, __u32 hash,
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struct dx_frame *frame,
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struct dx_frame *frames,
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__u32 *start_hash);
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static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
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struct ext4_filename *fname,
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struct ext4_dir_entry_2 **res_dir);
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static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
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struct inode *dir, struct inode *inode);
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/* checksumming functions */
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void ext4_initialize_dirent_tail(struct buffer_head *bh,
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unsigned int blocksize)
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{
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struct ext4_dir_entry_tail *t = EXT4_DIRENT_TAIL(bh->b_data, blocksize);
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memset(t, 0, sizeof(struct ext4_dir_entry_tail));
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t->det_rec_len = ext4_rec_len_to_disk(
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sizeof(struct ext4_dir_entry_tail), blocksize);
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t->det_reserved_ft = EXT4_FT_DIR_CSUM;
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}
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/* Walk through a dirent block to find a checksum "dirent" at the tail */
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static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode,
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struct buffer_head *bh)
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{
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struct ext4_dir_entry_tail *t;
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#ifdef PARANOID
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struct ext4_dir_entry *d, *top;
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d = (struct ext4_dir_entry *)bh->b_data;
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top = (struct ext4_dir_entry *)(bh->b_data +
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(EXT4_BLOCK_SIZE(inode->i_sb) -
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sizeof(struct ext4_dir_entry_tail)));
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while (d < top && d->rec_len)
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d = (struct ext4_dir_entry *)(((void *)d) +
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le16_to_cpu(d->rec_len));
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if (d != top)
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return NULL;
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t = (struct ext4_dir_entry_tail *)d;
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#else
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t = EXT4_DIRENT_TAIL(bh->b_data, EXT4_BLOCK_SIZE(inode->i_sb));
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#endif
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if (t->det_reserved_zero1 ||
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le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) ||
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t->det_reserved_zero2 ||
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t->det_reserved_ft != EXT4_FT_DIR_CSUM)
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return NULL;
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return t;
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}
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static __le32 ext4_dirblock_csum(struct inode *inode, void *dirent, int size)
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{
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
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struct ext4_inode_info *ei = EXT4_I(inode);
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__u32 csum;
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csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
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return cpu_to_le32(csum);
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}
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#define warn_no_space_for_csum(inode) \
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__warn_no_space_for_csum((inode), __func__, __LINE__)
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static void __warn_no_space_for_csum(struct inode *inode, const char *func,
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unsigned int line)
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{
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__ext4_warning_inode(inode, func, line,
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"No space for directory leaf checksum. Please run e2fsck -D.");
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}
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int ext4_dirblock_csum_verify(struct inode *inode, struct buffer_head *bh)
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{
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struct ext4_dir_entry_tail *t;
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if (!ext4_has_metadata_csum(inode->i_sb))
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return 1;
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t = get_dirent_tail(inode, bh);
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if (!t) {
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warn_no_space_for_csum(inode);
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return 0;
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}
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if (t->det_checksum != ext4_dirblock_csum(inode, bh->b_data,
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(char *)t - bh->b_data))
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return 0;
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return 1;
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}
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static void ext4_dirblock_csum_set(struct inode *inode,
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struct buffer_head *bh)
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{
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struct ext4_dir_entry_tail *t;
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if (!ext4_has_metadata_csum(inode->i_sb))
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return;
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t = get_dirent_tail(inode, bh);
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if (!t) {
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warn_no_space_for_csum(inode);
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return;
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}
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t->det_checksum = ext4_dirblock_csum(inode, bh->b_data,
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(char *)t - bh->b_data);
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}
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int ext4_handle_dirty_dirblock(handle_t *handle,
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struct inode *inode,
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struct buffer_head *bh)
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{
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ext4_dirblock_csum_set(inode, bh);
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return ext4_handle_dirty_metadata(handle, inode, bh);
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}
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static struct dx_countlimit *get_dx_countlimit(struct inode *inode,
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struct ext4_dir_entry *dirent,
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int *offset)
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{
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struct ext4_dir_entry *dp;
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struct dx_root_info *root;
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int count_offset;
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if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb))
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count_offset = 8;
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else if (le16_to_cpu(dirent->rec_len) == 12) {
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dp = (struct ext4_dir_entry *)(((void *)dirent) + 12);
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if (le16_to_cpu(dp->rec_len) !=
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EXT4_BLOCK_SIZE(inode->i_sb) - 12)
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return NULL;
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root = (struct dx_root_info *)(((void *)dp + 12));
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if (root->reserved_zero ||
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root->info_length != sizeof(struct dx_root_info))
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return NULL;
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count_offset = 32;
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} else
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return NULL;
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if (offset)
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*offset = count_offset;
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return (struct dx_countlimit *)(((void *)dirent) + count_offset);
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}
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static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent,
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int count_offset, int count, struct dx_tail *t)
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{
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
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struct ext4_inode_info *ei = EXT4_I(inode);
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__u32 csum;
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int size;
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__u32 dummy_csum = 0;
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int offset = offsetof(struct dx_tail, dt_checksum);
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size = count_offset + (count * sizeof(struct dx_entry));
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csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
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csum = ext4_chksum(sbi, csum, (__u8 *)t, offset);
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csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
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return cpu_to_le32(csum);
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}
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static int ext4_dx_csum_verify(struct inode *inode,
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struct ext4_dir_entry *dirent)
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{
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struct dx_countlimit *c;
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struct dx_tail *t;
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int count_offset, limit, count;
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if (!ext4_has_metadata_csum(inode->i_sb))
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return 1;
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c = get_dx_countlimit(inode, dirent, &count_offset);
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if (!c) {
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EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
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return 0;
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}
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limit = le16_to_cpu(c->limit);
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count = le16_to_cpu(c->count);
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if (count_offset + (limit * sizeof(struct dx_entry)) >
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EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
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warn_no_space_for_csum(inode);
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return 0;
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}
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t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
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if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset,
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count, t))
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return 0;
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return 1;
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|
}
|
|
|
|
static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent)
|
|
{
|
|
struct dx_countlimit *c;
|
|
struct dx_tail *t;
|
|
int count_offset, limit, count;
|
|
|
|
if (!ext4_has_metadata_csum(inode->i_sb))
|
|
return;
|
|
|
|
c = get_dx_countlimit(inode, dirent, &count_offset);
|
|
if (!c) {
|
|
EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
|
|
return;
|
|
}
|
|
limit = le16_to_cpu(c->limit);
|
|
count = le16_to_cpu(c->count);
|
|
if (count_offset + (limit * sizeof(struct dx_entry)) >
|
|
EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
|
|
warn_no_space_for_csum(inode);
|
|
return;
|
|
}
|
|
t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
|
|
|
|
t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t);
|
|
}
|
|
|
|
static inline int ext4_handle_dirty_dx_node(handle_t *handle,
|
|
struct inode *inode,
|
|
struct buffer_head *bh)
|
|
{
|
|
ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data);
|
|
return ext4_handle_dirty_metadata(handle, inode, bh);
|
|
}
|
|
|
|
/*
|
|
* p is at least 6 bytes before the end of page
|
|
*/
|
|
static inline struct ext4_dir_entry_2 *
|
|
ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize)
|
|
{
|
|
return (struct ext4_dir_entry_2 *)((char *)p +
|
|
ext4_rec_len_from_disk(p->rec_len, blocksize));
|
|
}
|
|
|
|
/*
|
|
* Future: use high four bits of block for coalesce-on-delete flags
|
|
* Mask them off for now.
|
|
*/
|
|
|
|
static inline ext4_lblk_t dx_get_block(struct dx_entry *entry)
|
|
{
|
|
return le32_to_cpu(entry->block) & 0x0fffffff;
|
|
}
|
|
|
|
static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value)
|
|
{
|
|
entry->block = cpu_to_le32(value);
|
|
}
|
|
|
|
static inline unsigned dx_get_hash(struct dx_entry *entry)
|
|
{
|
|
return le32_to_cpu(entry->hash);
|
|
}
|
|
|
|
static inline void dx_set_hash(struct dx_entry *entry, unsigned value)
|
|
{
|
|
entry->hash = cpu_to_le32(value);
|
|
}
|
|
|
|
static inline unsigned dx_get_count(struct dx_entry *entries)
|
|
{
|
|
return le16_to_cpu(((struct dx_countlimit *) entries)->count);
|
|
}
|
|
|
|
static inline unsigned dx_get_limit(struct dx_entry *entries)
|
|
{
|
|
return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
|
|
}
|
|
|
|
static inline void dx_set_count(struct dx_entry *entries, unsigned value)
|
|
{
|
|
((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
|
|
}
|
|
|
|
static inline void dx_set_limit(struct dx_entry *entries, unsigned value)
|
|
{
|
|
((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
|
|
}
|
|
|
|
static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
|
|
{
|
|
unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
|
|
EXT4_DIR_REC_LEN(2) - infosize;
|
|
|
|
if (ext4_has_metadata_csum(dir->i_sb))
|
|
entry_space -= sizeof(struct dx_tail);
|
|
return entry_space / sizeof(struct dx_entry);
|
|
}
|
|
|
|
static inline unsigned dx_node_limit(struct inode *dir)
|
|
{
|
|
unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
|
|
|
|
if (ext4_has_metadata_csum(dir->i_sb))
|
|
entry_space -= sizeof(struct dx_tail);
|
|
return entry_space / sizeof(struct dx_entry);
|
|
}
|
|
|
|
/*
|
|
* Debug
|
|
*/
|
|
#ifdef DX_DEBUG
|
|
static void dx_show_index(char * label, struct dx_entry *entries)
|
|
{
|
|
int i, n = dx_get_count (entries);
|
|
printk(KERN_DEBUG "%s index", label);
|
|
for (i = 0; i < n; i++) {
|
|
printk(KERN_CONT " %x->%lu",
|
|
i ? dx_get_hash(entries + i) : 0,
|
|
(unsigned long)dx_get_block(entries + i));
|
|
}
|
|
printk(KERN_CONT "\n");
|
|
}
|
|
|
|
struct stats
|
|
{
|
|
unsigned names;
|
|
unsigned space;
|
|
unsigned bcount;
|
|
};
|
|
|
|
static struct stats dx_show_leaf(struct inode *dir,
|
|
struct dx_hash_info *hinfo,
|
|
struct ext4_dir_entry_2 *de,
|
|
int size, int show_names)
|
|
{
|
|
unsigned names = 0, space = 0;
|
|
char *base = (char *) de;
|
|
struct dx_hash_info h = *hinfo;
|
|
|
|
printk("names: ");
|
|
while ((char *) de < base + size)
|
|
{
|
|
if (de->inode)
|
|
{
|
|
if (show_names)
|
|
{
|
|
#ifdef CONFIG_FS_ENCRYPTION
|
|
int len;
|
|
char *name;
|
|
struct fscrypt_str fname_crypto_str =
|
|
FSTR_INIT(NULL, 0);
|
|
int res = 0;
|
|
|
|
name = de->name;
|
|
len = de->name_len;
|
|
if (IS_ENCRYPTED(dir))
|
|
res = fscrypt_get_encryption_info(dir);
|
|
if (res) {
|
|
printk(KERN_WARNING "Error setting up"
|
|
" fname crypto: %d\n", res);
|
|
}
|
|
if (!fscrypt_has_encryption_key(dir)) {
|
|
/* Directory is not encrypted */
|
|
ext4fs_dirhash(dir, de->name,
|
|
de->name_len, &h);
|
|
printk("%*.s:(U)%x.%u ", len,
|
|
name, h.hash,
|
|
(unsigned) ((char *) de
|
|
- base));
|
|
} else {
|
|
struct fscrypt_str de_name =
|
|
FSTR_INIT(name, len);
|
|
|
|
/* Directory is encrypted */
|
|
res = fscrypt_fname_alloc_buffer(
|
|
dir, len,
|
|
&fname_crypto_str);
|
|
if (res)
|
|
printk(KERN_WARNING "Error "
|
|
"allocating crypto "
|
|
"buffer--skipping "
|
|
"crypto\n");
|
|
res = fscrypt_fname_disk_to_usr(dir,
|
|
0, 0, &de_name,
|
|
&fname_crypto_str);
|
|
if (res) {
|
|
printk(KERN_WARNING "Error "
|
|
"converting filename "
|
|
"from disk to usr"
|
|
"\n");
|
|
name = "??";
|
|
len = 2;
|
|
} else {
|
|
name = fname_crypto_str.name;
|
|
len = fname_crypto_str.len;
|
|
}
|
|
ext4fs_dirhash(dir, de->name,
|
|
de->name_len, &h);
|
|
printk("%*.s:(E)%x.%u ", len, name,
|
|
h.hash, (unsigned) ((char *) de
|
|
- base));
|
|
fscrypt_fname_free_buffer(
|
|
&fname_crypto_str);
|
|
}
|
|
#else
|
|
int len = de->name_len;
|
|
char *name = de->name;
|
|
ext4fs_dirhash(dir, de->name, de->name_len, &h);
|
|
printk("%*.s:%x.%u ", len, name, h.hash,
|
|
(unsigned) ((char *) de - base));
|
|
#endif
|
|
}
|
|
space += EXT4_DIR_REC_LEN(de->name_len);
|
|
names++;
|
|
}
|
|
de = ext4_next_entry(de, size);
|
|
}
|
|
printk(KERN_CONT "(%i)\n", names);
|
|
return (struct stats) { names, space, 1 };
|
|
}
|
|
|
|
struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
|
|
struct dx_entry *entries, int levels)
|
|
{
|
|
unsigned blocksize = dir->i_sb->s_blocksize;
|
|
unsigned count = dx_get_count(entries), names = 0, space = 0, i;
|
|
unsigned bcount = 0;
|
|
struct buffer_head *bh;
|
|
printk("%i indexed blocks...\n", count);
|
|
for (i = 0; i < count; i++, entries++)
|
|
{
|
|
ext4_lblk_t block = dx_get_block(entries);
|
|
ext4_lblk_t hash = i ? dx_get_hash(entries): 0;
|
|
u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
|
|
struct stats stats;
|
|
printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
|
|
bh = ext4_bread(NULL,dir, block, 0);
|
|
if (!bh || IS_ERR(bh))
|
|
continue;
|
|
stats = levels?
|
|
dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
|
|
dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *)
|
|
bh->b_data, blocksize, 0);
|
|
names += stats.names;
|
|
space += stats.space;
|
|
bcount += stats.bcount;
|
|
brelse(bh);
|
|
}
|
|
if (bcount)
|
|
printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n",
|
|
levels ? "" : " ", names, space/bcount,
|
|
(space/bcount)*100/blocksize);
|
|
return (struct stats) { names, space, bcount};
|
|
}
|
|
#endif /* DX_DEBUG */
|
|
|
|
/*
|
|
* Probe for a directory leaf block to search.
|
|
*
|
|
* dx_probe can return ERR_BAD_DX_DIR, which means there was a format
|
|
* error in the directory index, and the caller should fall back to
|
|
* searching the directory normally. The callers of dx_probe **MUST**
|
|
* check for this error code, and make sure it never gets reflected
|
|
* back to userspace.
|
|
*/
|
|
static struct dx_frame *
|
|
dx_probe(struct ext4_filename *fname, struct inode *dir,
|
|
struct dx_hash_info *hinfo, struct dx_frame *frame_in)
|
|
{
|
|
unsigned count, indirect;
|
|
struct dx_entry *at, *entries, *p, *q, *m;
|
|
struct dx_root *root;
|
|
struct dx_frame *frame = frame_in;
|
|
struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR);
|
|
u32 hash;
|
|
|
|
memset(frame_in, 0, EXT4_HTREE_LEVEL * sizeof(frame_in[0]));
|
|
frame->bh = ext4_read_dirblock(dir, 0, INDEX);
|
|
if (IS_ERR(frame->bh))
|
|
return (struct dx_frame *) frame->bh;
|
|
|
|
root = (struct dx_root *) frame->bh->b_data;
|
|
if (root->info.hash_version != DX_HASH_TEA &&
|
|
root->info.hash_version != DX_HASH_HALF_MD4 &&
|
|
root->info.hash_version != DX_HASH_LEGACY) {
|
|
ext4_warning_inode(dir, "Unrecognised inode hash code %u",
|
|
root->info.hash_version);
|
|
goto fail;
|
|
}
|
|
if (fname)
|
|
hinfo = &fname->hinfo;
|
|
hinfo->hash_version = root->info.hash_version;
|
|
if (hinfo->hash_version <= DX_HASH_TEA)
|
|
hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
|
|
hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
|
|
if (fname && fname_name(fname))
|
|
ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), hinfo);
|
|
hash = hinfo->hash;
|
|
|
|
if (root->info.unused_flags & 1) {
|
|
ext4_warning_inode(dir, "Unimplemented hash flags: %#06x",
|
|
root->info.unused_flags);
|
|
goto fail;
|
|
}
|
|
|
|
indirect = root->info.indirect_levels;
|
|
if (indirect >= ext4_dir_htree_level(dir->i_sb)) {
|
|
ext4_warning(dir->i_sb,
|
|
"Directory (ino: %lu) htree depth %#06x exceed"
|
|
"supported value", dir->i_ino,
|
|
ext4_dir_htree_level(dir->i_sb));
|
|
if (ext4_dir_htree_level(dir->i_sb) < EXT4_HTREE_LEVEL) {
|
|
ext4_warning(dir->i_sb, "Enable large directory "
|
|
"feature to access it");
|
|
}
|
|
goto fail;
|
|
}
|
|
|
|
entries = (struct dx_entry *)(((char *)&root->info) +
|
|
root->info.info_length);
|
|
|
|
if (dx_get_limit(entries) != dx_root_limit(dir,
|
|
root->info.info_length)) {
|
|
ext4_warning_inode(dir, "dx entry: limit %u != root limit %u",
|
|
dx_get_limit(entries),
|
|
dx_root_limit(dir, root->info.info_length));
|
|
goto fail;
|
|
}
|
|
|
|
dxtrace(printk("Look up %x", hash));
|
|
while (1) {
|
|
count = dx_get_count(entries);
|
|
if (!count || count > dx_get_limit(entries)) {
|
|
ext4_warning_inode(dir,
|
|
"dx entry: count %u beyond limit %u",
|
|
count, dx_get_limit(entries));
|
|
goto fail;
|
|
}
|
|
|
|
p = entries + 1;
|
|
q = entries + count - 1;
|
|
while (p <= q) {
|
|
m = p + (q - p) / 2;
|
|
dxtrace(printk(KERN_CONT "."));
|
|
if (dx_get_hash(m) > hash)
|
|
q = m - 1;
|
|
else
|
|
p = m + 1;
|
|
}
|
|
|
|
if (0) { // linear search cross check
|
|
unsigned n = count - 1;
|
|
at = entries;
|
|
while (n--)
|
|
{
|
|
dxtrace(printk(KERN_CONT ","));
|
|
if (dx_get_hash(++at) > hash)
|
|
{
|
|
at--;
|
|
break;
|
|
}
|
|
}
|
|
assert (at == p - 1);
|
|
}
|
|
|
|
at = p - 1;
|
|
dxtrace(printk(KERN_CONT " %x->%u\n",
|
|
at == entries ? 0 : dx_get_hash(at),
|
|
dx_get_block(at)));
|
|
frame->entries = entries;
|
|
frame->at = at;
|
|
if (!indirect--)
|
|
return frame;
|
|
frame++;
|
|
frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
|
|
if (IS_ERR(frame->bh)) {
|
|
ret_err = (struct dx_frame *) frame->bh;
|
|
frame->bh = NULL;
|
|
goto fail;
|
|
}
|
|
entries = ((struct dx_node *) frame->bh->b_data)->entries;
|
|
|
|
if (dx_get_limit(entries) != dx_node_limit(dir)) {
|
|
ext4_warning_inode(dir,
|
|
"dx entry: limit %u != node limit %u",
|
|
dx_get_limit(entries), dx_node_limit(dir));
|
|
goto fail;
|
|
}
|
|
}
|
|
fail:
|
|
while (frame >= frame_in) {
|
|
brelse(frame->bh);
|
|
frame--;
|
|
}
|
|
|
|
if (ret_err == ERR_PTR(ERR_BAD_DX_DIR))
|
|
ext4_warning_inode(dir,
|
|
"Corrupt directory, running e2fsck is recommended");
|
|
return ret_err;
|
|
}
|
|
|
|
static void dx_release(struct dx_frame *frames)
|
|
{
|
|
struct dx_root_info *info;
|
|
int i;
|
|
unsigned int indirect_levels;
|
|
|
|
if (frames[0].bh == NULL)
|
|
return;
|
|
|
|
info = &((struct dx_root *)frames[0].bh->b_data)->info;
|
|
/* save local copy, "info" may be freed after brelse() */
|
|
indirect_levels = info->indirect_levels;
|
|
for (i = 0; i <= indirect_levels; i++) {
|
|
if (frames[i].bh == NULL)
|
|
break;
|
|
brelse(frames[i].bh);
|
|
frames[i].bh = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function increments the frame pointer to search the next leaf
|
|
* block, and reads in the necessary intervening nodes if the search
|
|
* should be necessary. Whether or not the search is necessary is
|
|
* controlled by the hash parameter. If the hash value is even, then
|
|
* the search is only continued if the next block starts with that
|
|
* hash value. This is used if we are searching for a specific file.
|
|
*
|
|
* If the hash value is HASH_NB_ALWAYS, then always go to the next block.
|
|
*
|
|
* This function returns 1 if the caller should continue to search,
|
|
* or 0 if it should not. If there is an error reading one of the
|
|
* index blocks, it will a negative error code.
|
|
*
|
|
* If start_hash is non-null, it will be filled in with the starting
|
|
* hash of the next page.
|
|
*/
|
|
static int ext4_htree_next_block(struct inode *dir, __u32 hash,
|
|
struct dx_frame *frame,
|
|
struct dx_frame *frames,
|
|
__u32 *start_hash)
|
|
{
|
|
struct dx_frame *p;
|
|
struct buffer_head *bh;
|
|
int num_frames = 0;
|
|
__u32 bhash;
|
|
|
|
p = frame;
|
|
/*
|
|
* Find the next leaf page by incrementing the frame pointer.
|
|
* If we run out of entries in the interior node, loop around and
|
|
* increment pointer in the parent node. When we break out of
|
|
* this loop, num_frames indicates the number of interior
|
|
* nodes need to be read.
|
|
*/
|
|
while (1) {
|
|
if (++(p->at) < p->entries + dx_get_count(p->entries))
|
|
break;
|
|
if (p == frames)
|
|
return 0;
|
|
num_frames++;
|
|
p--;
|
|
}
|
|
|
|
/*
|
|
* If the hash is 1, then continue only if the next page has a
|
|
* continuation hash of any value. This is used for readdir
|
|
* handling. Otherwise, check to see if the hash matches the
|
|
* desired contiuation hash. If it doesn't, return since
|
|
* there's no point to read in the successive index pages.
|
|
*/
|
|
bhash = dx_get_hash(p->at);
|
|
if (start_hash)
|
|
*start_hash = bhash;
|
|
if ((hash & 1) == 0) {
|
|
if ((bhash & ~1) != hash)
|
|
return 0;
|
|
}
|
|
/*
|
|
* If the hash is HASH_NB_ALWAYS, we always go to the next
|
|
* block so no check is necessary
|
|
*/
|
|
while (num_frames--) {
|
|
bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX);
|
|
if (IS_ERR(bh))
|
|
return PTR_ERR(bh);
|
|
p++;
|
|
brelse(p->bh);
|
|
p->bh = bh;
|
|
p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* This function fills a red-black tree with information from a
|
|
* directory block. It returns the number directory entries loaded
|
|
* into the tree. If there is an error it is returned in err.
|
|
*/
|
|
static int htree_dirblock_to_tree(struct file *dir_file,
|
|
struct inode *dir, ext4_lblk_t block,
|
|
struct dx_hash_info *hinfo,
|
|
__u32 start_hash, __u32 start_minor_hash)
|
|
{
|
|
struct buffer_head *bh;
|
|
struct ext4_dir_entry_2 *de, *top;
|
|
int err = 0, count = 0;
|
|
struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str;
|
|
|
|
dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
|
|
(unsigned long)block));
|
|
bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
|
|
if (IS_ERR(bh))
|
|
return PTR_ERR(bh);
|
|
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
top = (struct ext4_dir_entry_2 *) ((char *) de +
|
|
dir->i_sb->s_blocksize -
|
|
EXT4_DIR_REC_LEN(0));
|
|
#ifdef CONFIG_FS_ENCRYPTION
|
|
/* Check if the directory is encrypted */
|
|
if (IS_ENCRYPTED(dir)) {
|
|
err = fscrypt_get_encryption_info(dir);
|
|
if (err < 0) {
|
|
brelse(bh);
|
|
return err;
|
|
}
|
|
err = fscrypt_fname_alloc_buffer(dir, EXT4_NAME_LEN,
|
|
&fname_crypto_str);
|
|
if (err < 0) {
|
|
brelse(bh);
|
|
return err;
|
|
}
|
|
}
|
|
#endif
|
|
for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) {
|
|
if (ext4_check_dir_entry(dir, NULL, de, bh,
|
|
bh->b_data, bh->b_size,
|
|
(block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb))
|
|
+ ((char *)de - bh->b_data))) {
|
|
/* silently ignore the rest of the block */
|
|
break;
|
|
}
|
|
ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
|
|
if ((hinfo->hash < start_hash) ||
|
|
((hinfo->hash == start_hash) &&
|
|
(hinfo->minor_hash < start_minor_hash)))
|
|
continue;
|
|
if (de->inode == 0)
|
|
continue;
|
|
if (!IS_ENCRYPTED(dir)) {
|
|
tmp_str.name = de->name;
|
|
tmp_str.len = de->name_len;
|
|
err = ext4_htree_store_dirent(dir_file,
|
|
hinfo->hash, hinfo->minor_hash, de,
|
|
&tmp_str);
|
|
} else {
|
|
int save_len = fname_crypto_str.len;
|
|
struct fscrypt_str de_name = FSTR_INIT(de->name,
|
|
de->name_len);
|
|
|
|
/* Directory is encrypted */
|
|
err = fscrypt_fname_disk_to_usr(dir, hinfo->hash,
|
|
hinfo->minor_hash, &de_name,
|
|
&fname_crypto_str);
|
|
if (err) {
|
|
count = err;
|
|
goto errout;
|
|
}
|
|
err = ext4_htree_store_dirent(dir_file,
|
|
hinfo->hash, hinfo->minor_hash, de,
|
|
&fname_crypto_str);
|
|
fname_crypto_str.len = save_len;
|
|
}
|
|
if (err != 0) {
|
|
count = err;
|
|
goto errout;
|
|
}
|
|
count++;
|
|
}
|
|
errout:
|
|
brelse(bh);
|
|
#ifdef CONFIG_FS_ENCRYPTION
|
|
fscrypt_fname_free_buffer(&fname_crypto_str);
|
|
#endif
|
|
return count;
|
|
}
|
|
|
|
|
|
/*
|
|
* This function fills a red-black tree with information from a
|
|
* directory. We start scanning the directory in hash order, starting
|
|
* at start_hash and start_minor_hash.
|
|
*
|
|
* This function returns the number of entries inserted into the tree,
|
|
* or a negative error code.
|
|
*/
|
|
int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
|
|
__u32 start_minor_hash, __u32 *next_hash)
|
|
{
|
|
struct dx_hash_info hinfo;
|
|
struct ext4_dir_entry_2 *de;
|
|
struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
|
|
struct inode *dir;
|
|
ext4_lblk_t block;
|
|
int count = 0;
|
|
int ret, err;
|
|
__u32 hashval;
|
|
struct fscrypt_str tmp_str;
|
|
|
|
dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n",
|
|
start_hash, start_minor_hash));
|
|
dir = file_inode(dir_file);
|
|
if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) {
|
|
hinfo.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
|
|
if (hinfo.hash_version <= DX_HASH_TEA)
|
|
hinfo.hash_version +=
|
|
EXT4_SB(dir->i_sb)->s_hash_unsigned;
|
|
hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
|
|
if (ext4_has_inline_data(dir)) {
|
|
int has_inline_data = 1;
|
|
count = ext4_inlinedir_to_tree(dir_file, dir, 0,
|
|
&hinfo, start_hash,
|
|
start_minor_hash,
|
|
&has_inline_data);
|
|
if (has_inline_data) {
|
|
*next_hash = ~0;
|
|
return count;
|
|
}
|
|
}
|
|
count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
|
|
start_hash, start_minor_hash);
|
|
*next_hash = ~0;
|
|
return count;
|
|
}
|
|
hinfo.hash = start_hash;
|
|
hinfo.minor_hash = 0;
|
|
frame = dx_probe(NULL, dir, &hinfo, frames);
|
|
if (IS_ERR(frame))
|
|
return PTR_ERR(frame);
|
|
|
|
/* Add '.' and '..' from the htree header */
|
|
if (!start_hash && !start_minor_hash) {
|
|
de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
|
|
tmp_str.name = de->name;
|
|
tmp_str.len = de->name_len;
|
|
err = ext4_htree_store_dirent(dir_file, 0, 0,
|
|
de, &tmp_str);
|
|
if (err != 0)
|
|
goto errout;
|
|
count++;
|
|
}
|
|
if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
|
|
de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
|
|
de = ext4_next_entry(de, dir->i_sb->s_blocksize);
|
|
tmp_str.name = de->name;
|
|
tmp_str.len = de->name_len;
|
|
err = ext4_htree_store_dirent(dir_file, 2, 0,
|
|
de, &tmp_str);
|
|
if (err != 0)
|
|
goto errout;
|
|
count++;
|
|
}
|
|
|
|
while (1) {
|
|
if (fatal_signal_pending(current)) {
|
|
err = -ERESTARTSYS;
|
|
goto errout;
|
|
}
|
|
cond_resched();
|
|
block = dx_get_block(frame->at);
|
|
ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
|
|
start_hash, start_minor_hash);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto errout;
|
|
}
|
|
count += ret;
|
|
hashval = ~0;
|
|
ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS,
|
|
frame, frames, &hashval);
|
|
*next_hash = hashval;
|
|
if (ret < 0) {
|
|
err = ret;
|
|
goto errout;
|
|
}
|
|
/*
|
|
* Stop if: (a) there are no more entries, or
|
|
* (b) we have inserted at least one entry and the
|
|
* next hash value is not a continuation
|
|
*/
|
|
if ((ret == 0) ||
|
|
(count && ((hashval & 1) == 0)))
|
|
break;
|
|
}
|
|
dx_release(frames);
|
|
dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, "
|
|
"next hash: %x\n", count, *next_hash));
|
|
return count;
|
|
errout:
|
|
dx_release(frames);
|
|
return (err);
|
|
}
|
|
|
|
static inline int search_dirblock(struct buffer_head *bh,
|
|
struct inode *dir,
|
|
struct ext4_filename *fname,
|
|
unsigned int offset,
|
|
struct ext4_dir_entry_2 **res_dir)
|
|
{
|
|
return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir,
|
|
fname, offset, res_dir);
|
|
}
|
|
|
|
/*
|
|
* Directory block splitting, compacting
|
|
*/
|
|
|
|
/*
|
|
* Create map of hash values, offsets, and sizes, stored at end of block.
|
|
* Returns number of entries mapped.
|
|
*/
|
|
static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
|
|
unsigned blocksize, struct dx_hash_info *hinfo,
|
|
struct dx_map_entry *map_tail)
|
|
{
|
|
int count = 0;
|
|
char *base = (char *) de;
|
|
struct dx_hash_info h = *hinfo;
|
|
|
|
while ((char *) de < base + blocksize) {
|
|
if (de->name_len && de->inode) {
|
|
ext4fs_dirhash(dir, de->name, de->name_len, &h);
|
|
map_tail--;
|
|
map_tail->hash = h.hash;
|
|
map_tail->offs = ((char *) de - base)>>2;
|
|
map_tail->size = le16_to_cpu(de->rec_len);
|
|
count++;
|
|
cond_resched();
|
|
}
|
|
/* XXX: do we need to check rec_len == 0 case? -Chris */
|
|
de = ext4_next_entry(de, blocksize);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
/* Sort map by hash value */
|
|
static void dx_sort_map (struct dx_map_entry *map, unsigned count)
|
|
{
|
|
struct dx_map_entry *p, *q, *top = map + count - 1;
|
|
int more;
|
|
/* Combsort until bubble sort doesn't suck */
|
|
while (count > 2) {
|
|
count = count*10/13;
|
|
if (count - 9 < 2) /* 9, 10 -> 11 */
|
|
count = 11;
|
|
for (p = top, q = p - count; q >= map; p--, q--)
|
|
if (p->hash < q->hash)
|
|
swap(*p, *q);
|
|
}
|
|
/* Garden variety bubble sort */
|
|
do {
|
|
more = 0;
|
|
q = top;
|
|
while (q-- > map) {
|
|
if (q[1].hash >= q[0].hash)
|
|
continue;
|
|
swap(*(q+1), *q);
|
|
more = 1;
|
|
}
|
|
} while(more);
|
|
}
|
|
|
|
static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
|
|
{
|
|
struct dx_entry *entries = frame->entries;
|
|
struct dx_entry *old = frame->at, *new = old + 1;
|
|
int count = dx_get_count(entries);
|
|
|
|
assert(count < dx_get_limit(entries));
|
|
assert(old < entries + count);
|
|
memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
|
|
dx_set_hash(new, hash);
|
|
dx_set_block(new, block);
|
|
dx_set_count(entries, count + 1);
|
|
}
|
|
|
|
#ifdef CONFIG_UNICODE
|
|
/*
|
|
* Test whether a case-insensitive directory entry matches the filename
|
|
* being searched for. If quick is set, assume the name being looked up
|
|
* is already in the casefolded form.
|
|
*
|
|
* Returns: 0 if the directory entry matches, more than 0 if it
|
|
* doesn't match or less than zero on error.
|
|
*/
|
|
int ext4_ci_compare(const struct inode *parent, const struct qstr *name,
|
|
const struct qstr *entry, bool quick)
|
|
{
|
|
const struct ext4_sb_info *sbi = EXT4_SB(parent->i_sb);
|
|
const struct unicode_map *um = sbi->s_encoding;
|
|
int ret;
|
|
|
|
if (quick)
|
|
ret = utf8_strncasecmp_folded(um, name, entry);
|
|
else
|
|
ret = utf8_strncasecmp(um, name, entry);
|
|
|
|
if (ret < 0) {
|
|
/* Handle invalid character sequence as either an error
|
|
* or as an opaque byte sequence.
|
|
*/
|
|
if (ext4_has_strict_mode(sbi))
|
|
return -EINVAL;
|
|
|
|
if (name->len != entry->len)
|
|
return 1;
|
|
|
|
return !!memcmp(name->name, entry->name, name->len);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname,
|
|
struct fscrypt_str *cf_name)
|
|
{
|
|
int len;
|
|
|
|
if (!IS_CASEFOLDED(dir)) {
|
|
cf_name->name = NULL;
|
|
return;
|
|
}
|
|
|
|
cf_name->name = kmalloc(EXT4_NAME_LEN, GFP_NOFS);
|
|
if (!cf_name->name)
|
|
return;
|
|
|
|
len = utf8_casefold(EXT4_SB(dir->i_sb)->s_encoding,
|
|
iname, cf_name->name,
|
|
EXT4_NAME_LEN);
|
|
if (len <= 0) {
|
|
kfree(cf_name->name);
|
|
cf_name->name = NULL;
|
|
return;
|
|
}
|
|
cf_name->len = (unsigned) len;
|
|
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Test whether a directory entry matches the filename being searched for.
|
|
*
|
|
* Return: %true if the directory entry matches, otherwise %false.
|
|
*/
|
|
static inline bool ext4_match(const struct inode *parent,
|
|
const struct ext4_filename *fname,
|
|
const struct ext4_dir_entry_2 *de)
|
|
{
|
|
struct fscrypt_name f;
|
|
#ifdef CONFIG_UNICODE
|
|
const struct qstr entry = {.name = de->name, .len = de->name_len};
|
|
#endif
|
|
|
|
if (!de->inode)
|
|
return false;
|
|
|
|
f.usr_fname = fname->usr_fname;
|
|
f.disk_name = fname->disk_name;
|
|
#ifdef CONFIG_FS_ENCRYPTION
|
|
f.crypto_buf = fname->crypto_buf;
|
|
#endif
|
|
|
|
#ifdef CONFIG_UNICODE
|
|
if (EXT4_SB(parent->i_sb)->s_encoding && IS_CASEFOLDED(parent)) {
|
|
if (fname->cf_name.name) {
|
|
struct qstr cf = {.name = fname->cf_name.name,
|
|
.len = fname->cf_name.len};
|
|
return !ext4_ci_compare(parent, &cf, &entry, true);
|
|
}
|
|
return !ext4_ci_compare(parent, fname->usr_fname, &entry,
|
|
false);
|
|
}
|
|
#endif
|
|
|
|
return fscrypt_match_name(&f, de->name, de->name_len);
|
|
}
|
|
|
|
/*
|
|
* Returns 0 if not found, -1 on failure, and 1 on success
|
|
*/
|
|
int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
|
|
struct inode *dir, struct ext4_filename *fname,
|
|
unsigned int offset, struct ext4_dir_entry_2 **res_dir)
|
|
{
|
|
struct ext4_dir_entry_2 * de;
|
|
char * dlimit;
|
|
int de_len;
|
|
|
|
de = (struct ext4_dir_entry_2 *)search_buf;
|
|
dlimit = search_buf + buf_size;
|
|
while ((char *) de < dlimit) {
|
|
/* this code is executed quadratically often */
|
|
/* do minimal checking `by hand' */
|
|
if ((char *) de + de->name_len <= dlimit &&
|
|
ext4_match(dir, fname, de)) {
|
|
/* found a match - just to be sure, do
|
|
* a full check */
|
|
if (ext4_check_dir_entry(dir, NULL, de, bh, bh->b_data,
|
|
bh->b_size, offset))
|
|
return -1;
|
|
*res_dir = de;
|
|
return 1;
|
|
}
|
|
/* prevent looping on a bad block */
|
|
de_len = ext4_rec_len_from_disk(de->rec_len,
|
|
dir->i_sb->s_blocksize);
|
|
if (de_len <= 0)
|
|
return -1;
|
|
offset += de_len;
|
|
de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block,
|
|
struct ext4_dir_entry *de)
|
|
{
|
|
struct super_block *sb = dir->i_sb;
|
|
|
|
if (!is_dx(dir))
|
|
return 0;
|
|
if (block == 0)
|
|
return 1;
|
|
if (de->inode == 0 &&
|
|
ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) ==
|
|
sb->s_blocksize)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* __ext4_find_entry()
|
|
*
|
|
* finds an entry in the specified directory with the wanted name. It
|
|
* returns the cache buffer in which the entry was found, and the entry
|
|
* itself (as a parameter - res_dir). It does NOT read the inode of the
|
|
* entry - you'll have to do that yourself if you want to.
|
|
*
|
|
* The returned buffer_head has ->b_count elevated. The caller is expected
|
|
* to brelse() it when appropriate.
|
|
*/
|
|
static struct buffer_head *__ext4_find_entry(struct inode *dir,
|
|
struct ext4_filename *fname,
|
|
struct ext4_dir_entry_2 **res_dir,
|
|
int *inlined)
|
|
{
|
|
struct super_block *sb;
|
|
struct buffer_head *bh_use[NAMEI_RA_SIZE];
|
|
struct buffer_head *bh, *ret = NULL;
|
|
ext4_lblk_t start, block;
|
|
const u8 *name = fname->usr_fname->name;
|
|
size_t ra_max = 0; /* Number of bh's in the readahead
|
|
buffer, bh_use[] */
|
|
size_t ra_ptr = 0; /* Current index into readahead
|
|
buffer */
|
|
ext4_lblk_t nblocks;
|
|
int i, namelen, retval;
|
|
|
|
*res_dir = NULL;
|
|
sb = dir->i_sb;
|
|
namelen = fname->usr_fname->len;
|
|
if (namelen > EXT4_NAME_LEN)
|
|
return NULL;
|
|
|
|
if (ext4_has_inline_data(dir)) {
|
|
int has_inline_data = 1;
|
|
ret = ext4_find_inline_entry(dir, fname, res_dir,
|
|
&has_inline_data);
|
|
if (has_inline_data) {
|
|
if (inlined)
|
|
*inlined = 1;
|
|
goto cleanup_and_exit;
|
|
}
|
|
}
|
|
|
|
if ((namelen <= 2) && (name[0] == '.') &&
|
|
(name[1] == '.' || name[1] == '\0')) {
|
|
/*
|
|
* "." or ".." will only be in the first block
|
|
* NFS may look up ".."; "." should be handled by the VFS
|
|
*/
|
|
block = start = 0;
|
|
nblocks = 1;
|
|
goto restart;
|
|
}
|
|
if (is_dx(dir)) {
|
|
ret = ext4_dx_find_entry(dir, fname, res_dir);
|
|
/*
|
|
* On success, or if the error was file not found,
|
|
* return. Otherwise, fall back to doing a search the
|
|
* old fashioned way.
|
|
*/
|
|
if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR)
|
|
goto cleanup_and_exit;
|
|
dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
|
|
"falling back\n"));
|
|
ret = NULL;
|
|
}
|
|
nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
|
|
if (!nblocks) {
|
|
ret = NULL;
|
|
goto cleanup_and_exit;
|
|
}
|
|
start = EXT4_I(dir)->i_dir_start_lookup;
|
|
if (start >= nblocks)
|
|
start = 0;
|
|
block = start;
|
|
restart:
|
|
do {
|
|
/*
|
|
* We deal with the read-ahead logic here.
|
|
*/
|
|
if (ra_ptr >= ra_max) {
|
|
/* Refill the readahead buffer */
|
|
ra_ptr = 0;
|
|
if (block < start)
|
|
ra_max = start - block;
|
|
else
|
|
ra_max = nblocks - block;
|
|
ra_max = min(ra_max, ARRAY_SIZE(bh_use));
|
|
retval = ext4_bread_batch(dir, block, ra_max,
|
|
false /* wait */, bh_use);
|
|
if (retval) {
|
|
ret = ERR_PTR(retval);
|
|
ra_max = 0;
|
|
goto cleanup_and_exit;
|
|
}
|
|
}
|
|
if ((bh = bh_use[ra_ptr++]) == NULL)
|
|
goto next;
|
|
wait_on_buffer(bh);
|
|
if (!buffer_uptodate(bh)) {
|
|
EXT4_ERROR_INODE(dir, "reading directory lblock %lu",
|
|
(unsigned long) block);
|
|
brelse(bh);
|
|
ret = ERR_PTR(-EIO);
|
|
goto cleanup_and_exit;
|
|
}
|
|
if (!buffer_verified(bh) &&
|
|
!is_dx_internal_node(dir, block,
|
|
(struct ext4_dir_entry *)bh->b_data) &&
|
|
!ext4_dirblock_csum_verify(dir, bh)) {
|
|
EXT4_ERROR_INODE(dir, "checksumming directory "
|
|
"block %lu", (unsigned long)block);
|
|
brelse(bh);
|
|
ret = ERR_PTR(-EFSBADCRC);
|
|
goto cleanup_and_exit;
|
|
}
|
|
set_buffer_verified(bh);
|
|
i = search_dirblock(bh, dir, fname,
|
|
block << EXT4_BLOCK_SIZE_BITS(sb), res_dir);
|
|
if (i == 1) {
|
|
EXT4_I(dir)->i_dir_start_lookup = block;
|
|
ret = bh;
|
|
goto cleanup_and_exit;
|
|
} else {
|
|
brelse(bh);
|
|
if (i < 0)
|
|
goto cleanup_and_exit;
|
|
}
|
|
next:
|
|
if (++block >= nblocks)
|
|
block = 0;
|
|
} while (block != start);
|
|
|
|
/*
|
|
* If the directory has grown while we were searching, then
|
|
* search the last part of the directory before giving up.
|
|
*/
|
|
block = nblocks;
|
|
nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
|
|
if (block < nblocks) {
|
|
start = 0;
|
|
goto restart;
|
|
}
|
|
|
|
cleanup_and_exit:
|
|
/* Clean up the read-ahead blocks */
|
|
for (; ra_ptr < ra_max; ra_ptr++)
|
|
brelse(bh_use[ra_ptr]);
|
|
return ret;
|
|
}
|
|
|
|
static struct buffer_head *ext4_find_entry(struct inode *dir,
|
|
const struct qstr *d_name,
|
|
struct ext4_dir_entry_2 **res_dir,
|
|
int *inlined)
|
|
{
|
|
int err;
|
|
struct ext4_filename fname;
|
|
struct buffer_head *bh;
|
|
|
|
err = ext4_fname_setup_filename(dir, d_name, 1, &fname);
|
|
if (err == -ENOENT)
|
|
return NULL;
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
bh = __ext4_find_entry(dir, &fname, res_dir, inlined);
|
|
|
|
ext4_fname_free_filename(&fname);
|
|
return bh;
|
|
}
|
|
|
|
static struct buffer_head *ext4_lookup_entry(struct inode *dir,
|
|
struct dentry *dentry,
|
|
struct ext4_dir_entry_2 **res_dir)
|
|
{
|
|
int err;
|
|
struct ext4_filename fname;
|
|
struct buffer_head *bh;
|
|
|
|
err = ext4_fname_prepare_lookup(dir, dentry, &fname);
|
|
if (err == -ENOENT)
|
|
return NULL;
|
|
if (err)
|
|
return ERR_PTR(err);
|
|
|
|
bh = __ext4_find_entry(dir, &fname, res_dir, NULL);
|
|
|
|
ext4_fname_free_filename(&fname);
|
|
return bh;
|
|
}
|
|
|
|
static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
|
|
struct ext4_filename *fname,
|
|
struct ext4_dir_entry_2 **res_dir)
|
|
{
|
|
struct super_block * sb = dir->i_sb;
|
|
struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
|
|
struct buffer_head *bh;
|
|
ext4_lblk_t block;
|
|
int retval;
|
|
|
|
#ifdef CONFIG_FS_ENCRYPTION
|
|
*res_dir = NULL;
|
|
#endif
|
|
frame = dx_probe(fname, dir, NULL, frames);
|
|
if (IS_ERR(frame))
|
|
return (struct buffer_head *) frame;
|
|
do {
|
|
block = dx_get_block(frame->at);
|
|
bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
|
|
if (IS_ERR(bh))
|
|
goto errout;
|
|
|
|
retval = search_dirblock(bh, dir, fname,
|
|
block << EXT4_BLOCK_SIZE_BITS(sb),
|
|
res_dir);
|
|
if (retval == 1)
|
|
goto success;
|
|
brelse(bh);
|
|
if (retval == -1) {
|
|
bh = ERR_PTR(ERR_BAD_DX_DIR);
|
|
goto errout;
|
|
}
|
|
|
|
/* Check to see if we should continue to search */
|
|
retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame,
|
|
frames, NULL);
|
|
if (retval < 0) {
|
|
ext4_warning_inode(dir,
|
|
"error %d reading directory index block",
|
|
retval);
|
|
bh = ERR_PTR(retval);
|
|
goto errout;
|
|
}
|
|
} while (retval == 1);
|
|
|
|
bh = NULL;
|
|
errout:
|
|
dxtrace(printk(KERN_DEBUG "%s not found\n", fname->usr_fname->name));
|
|
success:
|
|
dx_release(frames);
|
|
return bh;
|
|
}
|
|
|
|
static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
|
|
{
|
|
struct inode *inode;
|
|
struct ext4_dir_entry_2 *de;
|
|
struct buffer_head *bh;
|
|
|
|
if (dentry->d_name.len > EXT4_NAME_LEN)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
bh = ext4_lookup_entry(dir, dentry, &de);
|
|
if (IS_ERR(bh))
|
|
return ERR_CAST(bh);
|
|
inode = NULL;
|
|
if (bh) {
|
|
__u32 ino = le32_to_cpu(de->inode);
|
|
brelse(bh);
|
|
if (!ext4_valid_inum(dir->i_sb, ino)) {
|
|
EXT4_ERROR_INODE(dir, "bad inode number: %u", ino);
|
|
return ERR_PTR(-EFSCORRUPTED);
|
|
}
|
|
if (unlikely(ino == dir->i_ino)) {
|
|
EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir",
|
|
dentry);
|
|
return ERR_PTR(-EFSCORRUPTED);
|
|
}
|
|
inode = ext4_iget(dir->i_sb, ino, EXT4_IGET_NORMAL);
|
|
if (inode == ERR_PTR(-ESTALE)) {
|
|
EXT4_ERROR_INODE(dir,
|
|
"deleted inode referenced: %u",
|
|
ino);
|
|
return ERR_PTR(-EFSCORRUPTED);
|
|
}
|
|
if (!IS_ERR(inode) && IS_ENCRYPTED(dir) &&
|
|
(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
|
|
!fscrypt_has_permitted_context(dir, inode)) {
|
|
ext4_warning(inode->i_sb,
|
|
"Inconsistent encryption contexts: %lu/%lu",
|
|
dir->i_ino, inode->i_ino);
|
|
iput(inode);
|
|
return ERR_PTR(-EPERM);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_UNICODE
|
|
if (!inode && IS_CASEFOLDED(dir)) {
|
|
/* Eventually we want to call d_add_ci(dentry, NULL)
|
|
* for negative dentries in the encoding case as
|
|
* well. For now, prevent the negative dentry
|
|
* from being cached.
|
|
*/
|
|
return NULL;
|
|
}
|
|
#endif
|
|
return d_splice_alias(inode, dentry);
|
|
}
|
|
|
|
|
|
struct dentry *ext4_get_parent(struct dentry *child)
|
|
{
|
|
__u32 ino;
|
|
static const struct qstr dotdot = QSTR_INIT("..", 2);
|
|
struct ext4_dir_entry_2 * de;
|
|
struct buffer_head *bh;
|
|
|
|
bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL);
|
|
if (IS_ERR(bh))
|
|
return ERR_CAST(bh);
|
|
if (!bh)
|
|
return ERR_PTR(-ENOENT);
|
|
ino = le32_to_cpu(de->inode);
|
|
brelse(bh);
|
|
|
|
if (!ext4_valid_inum(child->d_sb, ino)) {
|
|
EXT4_ERROR_INODE(d_inode(child),
|
|
"bad parent inode number: %u", ino);
|
|
return ERR_PTR(-EFSCORRUPTED);
|
|
}
|
|
|
|
return d_obtain_alias(ext4_iget(child->d_sb, ino, EXT4_IGET_NORMAL));
|
|
}
|
|
|
|
/*
|
|
* Move count entries from end of map between two memory locations.
|
|
* Returns pointer to last entry moved.
|
|
*/
|
|
static struct ext4_dir_entry_2 *
|
|
dx_move_dirents(char *from, char *to, struct dx_map_entry *map, int count,
|
|
unsigned blocksize)
|
|
{
|
|
unsigned rec_len = 0;
|
|
|
|
while (count--) {
|
|
struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)
|
|
(from + (map->offs<<2));
|
|
rec_len = EXT4_DIR_REC_LEN(de->name_len);
|
|
memcpy (to, de, rec_len);
|
|
((struct ext4_dir_entry_2 *) to)->rec_len =
|
|
ext4_rec_len_to_disk(rec_len, blocksize);
|
|
de->inode = 0;
|
|
map++;
|
|
to += rec_len;
|
|
}
|
|
return (struct ext4_dir_entry_2 *) (to - rec_len);
|
|
}
|
|
|
|
/*
|
|
* Compact each dir entry in the range to the minimal rec_len.
|
|
* Returns pointer to last entry in range.
|
|
*/
|
|
static struct ext4_dir_entry_2* dx_pack_dirents(char *base, unsigned blocksize)
|
|
{
|
|
struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base;
|
|
unsigned rec_len = 0;
|
|
|
|
prev = to = de;
|
|
while ((char*)de < base + blocksize) {
|
|
next = ext4_next_entry(de, blocksize);
|
|
if (de->inode && de->name_len) {
|
|
rec_len = EXT4_DIR_REC_LEN(de->name_len);
|
|
if (de > to)
|
|
memmove(to, de, rec_len);
|
|
to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize);
|
|
prev = to;
|
|
to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
|
|
}
|
|
de = next;
|
|
}
|
|
return prev;
|
|
}
|
|
|
|
/*
|
|
* Split a full leaf block to make room for a new dir entry.
|
|
* Allocate a new block, and move entries so that they are approx. equally full.
|
|
* Returns pointer to de in block into which the new entry will be inserted.
|
|
*/
|
|
static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
|
|
struct buffer_head **bh,struct dx_frame *frame,
|
|
struct dx_hash_info *hinfo)
|
|
{
|
|
unsigned blocksize = dir->i_sb->s_blocksize;
|
|
unsigned count, continued;
|
|
struct buffer_head *bh2;
|
|
ext4_lblk_t newblock;
|
|
u32 hash2;
|
|
struct dx_map_entry *map;
|
|
char *data1 = (*bh)->b_data, *data2;
|
|
unsigned split, move, size;
|
|
struct ext4_dir_entry_2 *de = NULL, *de2;
|
|
int csum_size = 0;
|
|
int err = 0, i;
|
|
|
|
if (ext4_has_metadata_csum(dir->i_sb))
|
|
csum_size = sizeof(struct ext4_dir_entry_tail);
|
|
|
|
bh2 = ext4_append(handle, dir, &newblock);
|
|
if (IS_ERR(bh2)) {
|
|
brelse(*bh);
|
|
*bh = NULL;
|
|
return (struct ext4_dir_entry_2 *) bh2;
|
|
}
|
|
|
|
BUFFER_TRACE(*bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, *bh);
|
|
if (err)
|
|
goto journal_error;
|
|
|
|
BUFFER_TRACE(frame->bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, frame->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
|
|
data2 = bh2->b_data;
|
|
|
|
/* create map in the end of data2 block */
|
|
map = (struct dx_map_entry *) (data2 + blocksize);
|
|
count = dx_make_map(dir, (struct ext4_dir_entry_2 *) data1,
|
|
blocksize, hinfo, map);
|
|
map -= count;
|
|
dx_sort_map(map, count);
|
|
/* Split the existing block in the middle, size-wise */
|
|
size = 0;
|
|
move = 0;
|
|
for (i = count-1; i >= 0; i--) {
|
|
/* is more than half of this entry in 2nd half of the block? */
|
|
if (size + map[i].size/2 > blocksize/2)
|
|
break;
|
|
size += map[i].size;
|
|
move++;
|
|
}
|
|
/* map index at which we will split */
|
|
split = count - move;
|
|
hash2 = map[split].hash;
|
|
continued = hash2 == map[split - 1].hash;
|
|
dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
|
|
(unsigned long)dx_get_block(frame->at),
|
|
hash2, split, count-split));
|
|
|
|
/* Fancy dance to stay within two buffers */
|
|
de2 = dx_move_dirents(data1, data2, map + split, count - split,
|
|
blocksize);
|
|
de = dx_pack_dirents(data1, blocksize);
|
|
de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) -
|
|
(char *) de,
|
|
blocksize);
|
|
de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
|
|
(char *) de2,
|
|
blocksize);
|
|
if (csum_size) {
|
|
ext4_initialize_dirent_tail(*bh, blocksize);
|
|
ext4_initialize_dirent_tail(bh2, blocksize);
|
|
}
|
|
|
|
dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1,
|
|
blocksize, 1));
|
|
dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2,
|
|
blocksize, 1));
|
|
|
|
/* Which block gets the new entry? */
|
|
if (hinfo->hash >= hash2) {
|
|
swap(*bh, bh2);
|
|
de = de2;
|
|
}
|
|
dx_insert_block(frame, hash2 + continued, newblock);
|
|
err = ext4_handle_dirty_dirblock(handle, dir, bh2);
|
|
if (err)
|
|
goto journal_error;
|
|
err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
brelse(bh2);
|
|
dxtrace(dx_show_index("frame", frame->entries));
|
|
return de;
|
|
|
|
journal_error:
|
|
brelse(*bh);
|
|
brelse(bh2);
|
|
*bh = NULL;
|
|
ext4_std_error(dir->i_sb, err);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
int ext4_find_dest_de(struct inode *dir, struct inode *inode,
|
|
struct buffer_head *bh,
|
|
void *buf, int buf_size,
|
|
struct ext4_filename *fname,
|
|
struct ext4_dir_entry_2 **dest_de)
|
|
{
|
|
struct ext4_dir_entry_2 *de;
|
|
unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname));
|
|
int nlen, rlen;
|
|
unsigned int offset = 0;
|
|
char *top;
|
|
|
|
de = (struct ext4_dir_entry_2 *)buf;
|
|
top = buf + buf_size - reclen;
|
|
while ((char *) de <= top) {
|
|
if (ext4_check_dir_entry(dir, NULL, de, bh,
|
|
buf, buf_size, offset))
|
|
return -EFSCORRUPTED;
|
|
if (ext4_match(dir, fname, de))
|
|
return -EEXIST;
|
|
nlen = EXT4_DIR_REC_LEN(de->name_len);
|
|
rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
|
|
if ((de->inode ? rlen - nlen : rlen) >= reclen)
|
|
break;
|
|
de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
|
|
offset += rlen;
|
|
}
|
|
if ((char *) de > top)
|
|
return -ENOSPC;
|
|
|
|
*dest_de = de;
|
|
return 0;
|
|
}
|
|
|
|
void ext4_insert_dentry(struct inode *inode,
|
|
struct ext4_dir_entry_2 *de,
|
|
int buf_size,
|
|
struct ext4_filename *fname)
|
|
{
|
|
|
|
int nlen, rlen;
|
|
|
|
nlen = EXT4_DIR_REC_LEN(de->name_len);
|
|
rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
|
|
if (de->inode) {
|
|
struct ext4_dir_entry_2 *de1 =
|
|
(struct ext4_dir_entry_2 *)((char *)de + nlen);
|
|
de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size);
|
|
de->rec_len = ext4_rec_len_to_disk(nlen, buf_size);
|
|
de = de1;
|
|
}
|
|
de->file_type = EXT4_FT_UNKNOWN;
|
|
de->inode = cpu_to_le32(inode->i_ino);
|
|
ext4_set_de_type(inode->i_sb, de, inode->i_mode);
|
|
de->name_len = fname_len(fname);
|
|
memcpy(de->name, fname_name(fname), fname_len(fname));
|
|
}
|
|
|
|
/*
|
|
* Add a new entry into a directory (leaf) block. If de is non-NULL,
|
|
* it points to a directory entry which is guaranteed to be large
|
|
* enough for new directory entry. If de is NULL, then
|
|
* add_dirent_to_buf will attempt search the directory block for
|
|
* space. It will return -ENOSPC if no space is available, and -EIO
|
|
* and -EEXIST if directory entry already exists.
|
|
*/
|
|
static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
|
|
struct inode *dir,
|
|
struct inode *inode, struct ext4_dir_entry_2 *de,
|
|
struct buffer_head *bh)
|
|
{
|
|
unsigned int blocksize = dir->i_sb->s_blocksize;
|
|
int csum_size = 0;
|
|
int err;
|
|
|
|
if (ext4_has_metadata_csum(inode->i_sb))
|
|
csum_size = sizeof(struct ext4_dir_entry_tail);
|
|
|
|
if (!de) {
|
|
err = ext4_find_dest_de(dir, inode, bh, bh->b_data,
|
|
blocksize - csum_size, fname, &de);
|
|
if (err)
|
|
return err;
|
|
}
|
|
BUFFER_TRACE(bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, bh);
|
|
if (err) {
|
|
ext4_std_error(dir->i_sb, err);
|
|
return err;
|
|
}
|
|
|
|
/* By now the buffer is marked for journaling */
|
|
ext4_insert_dentry(inode, de, blocksize, fname);
|
|
|
|
/*
|
|
* XXX shouldn't update any times until successful
|
|
* completion of syscall, but too many callers depend
|
|
* on this.
|
|
*
|
|
* XXX similarly, too many callers depend on
|
|
* ext4_new_inode() setting the times, but error
|
|
* recovery deletes the inode, so the worst that can
|
|
* happen is that the times are slightly out of date
|
|
* and/or different from the directory change time.
|
|
*/
|
|
dir->i_mtime = dir->i_ctime = current_time(dir);
|
|
ext4_update_dx_flag(dir);
|
|
inode_inc_iversion(dir);
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
|
|
err = ext4_handle_dirty_dirblock(handle, dir, bh);
|
|
if (err)
|
|
ext4_std_error(dir->i_sb, err);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This converts a one block unindexed directory to a 3 block indexed
|
|
* directory, and adds the dentry to the indexed directory.
|
|
*/
|
|
static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
|
|
struct inode *dir,
|
|
struct inode *inode, struct buffer_head *bh)
|
|
{
|
|
struct buffer_head *bh2;
|
|
struct dx_root *root;
|
|
struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
|
|
struct dx_entry *entries;
|
|
struct ext4_dir_entry_2 *de, *de2;
|
|
char *data2, *top;
|
|
unsigned len;
|
|
int retval;
|
|
unsigned blocksize;
|
|
ext4_lblk_t block;
|
|
struct fake_dirent *fde;
|
|
int csum_size = 0;
|
|
|
|
if (ext4_has_metadata_csum(inode->i_sb))
|
|
csum_size = sizeof(struct ext4_dir_entry_tail);
|
|
|
|
blocksize = dir->i_sb->s_blocksize;
|
|
dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
|
|
BUFFER_TRACE(bh, "get_write_access");
|
|
retval = ext4_journal_get_write_access(handle, bh);
|
|
if (retval) {
|
|
ext4_std_error(dir->i_sb, retval);
|
|
brelse(bh);
|
|
return retval;
|
|
}
|
|
root = (struct dx_root *) bh->b_data;
|
|
|
|
/* The 0th block becomes the root, move the dirents out */
|
|
fde = &root->dotdot;
|
|
de = (struct ext4_dir_entry_2 *)((char *)fde +
|
|
ext4_rec_len_from_disk(fde->rec_len, blocksize));
|
|
if ((char *) de >= (((char *) root) + blocksize)) {
|
|
EXT4_ERROR_INODE(dir, "invalid rec_len for '..'");
|
|
brelse(bh);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
len = ((char *) root) + (blocksize - csum_size) - (char *) de;
|
|
|
|
/* Allocate new block for the 0th block's dirents */
|
|
bh2 = ext4_append(handle, dir, &block);
|
|
if (IS_ERR(bh2)) {
|
|
brelse(bh);
|
|
return PTR_ERR(bh2);
|
|
}
|
|
ext4_set_inode_flag(dir, EXT4_INODE_INDEX);
|
|
data2 = bh2->b_data;
|
|
|
|
memcpy(data2, de, len);
|
|
de = (struct ext4_dir_entry_2 *) data2;
|
|
top = data2 + len;
|
|
while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top)
|
|
de = de2;
|
|
de->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
|
|
(char *) de, blocksize);
|
|
|
|
if (csum_size)
|
|
ext4_initialize_dirent_tail(bh2, blocksize);
|
|
|
|
/* Initialize the root; the dot dirents already exist */
|
|
de = (struct ext4_dir_entry_2 *) (&root->dotdot);
|
|
de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2),
|
|
blocksize);
|
|
memset (&root->info, 0, sizeof(root->info));
|
|
root->info.info_length = sizeof(root->info);
|
|
root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
|
|
entries = root->entries;
|
|
dx_set_block(entries, 1);
|
|
dx_set_count(entries, 1);
|
|
dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info)));
|
|
|
|
/* Initialize as for dx_probe */
|
|
fname->hinfo.hash_version = root->info.hash_version;
|
|
if (fname->hinfo.hash_version <= DX_HASH_TEA)
|
|
fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
|
|
fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
|
|
ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), &fname->hinfo);
|
|
|
|
memset(frames, 0, sizeof(frames));
|
|
frame = frames;
|
|
frame->entries = entries;
|
|
frame->at = entries;
|
|
frame->bh = bh;
|
|
|
|
retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
|
|
if (retval)
|
|
goto out_frames;
|
|
retval = ext4_handle_dirty_dirblock(handle, dir, bh2);
|
|
if (retval)
|
|
goto out_frames;
|
|
|
|
de = do_split(handle,dir, &bh2, frame, &fname->hinfo);
|
|
if (IS_ERR(de)) {
|
|
retval = PTR_ERR(de);
|
|
goto out_frames;
|
|
}
|
|
|
|
retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh2);
|
|
out_frames:
|
|
/*
|
|
* Even if the block split failed, we have to properly write
|
|
* out all the changes we did so far. Otherwise we can end up
|
|
* with corrupted filesystem.
|
|
*/
|
|
if (retval)
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
dx_release(frames);
|
|
brelse(bh2);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* ext4_add_entry()
|
|
*
|
|
* adds a file entry to the specified directory, using the same
|
|
* semantics as ext4_find_entry(). It returns NULL if it failed.
|
|
*
|
|
* NOTE!! The inode part of 'de' is left at 0 - which means you
|
|
* may not sleep between calling this and putting something into
|
|
* the entry, as someone else might have used it while you slept.
|
|
*/
|
|
static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
|
|
struct inode *inode)
|
|
{
|
|
struct inode *dir = d_inode(dentry->d_parent);
|
|
struct buffer_head *bh = NULL;
|
|
struct ext4_dir_entry_2 *de;
|
|
struct super_block *sb;
|
|
struct ext4_sb_info *sbi;
|
|
struct ext4_filename fname;
|
|
int retval;
|
|
int dx_fallback=0;
|
|
unsigned blocksize;
|
|
ext4_lblk_t block, blocks;
|
|
int csum_size = 0;
|
|
|
|
if (ext4_has_metadata_csum(inode->i_sb))
|
|
csum_size = sizeof(struct ext4_dir_entry_tail);
|
|
|
|
sb = dir->i_sb;
|
|
sbi = EXT4_SB(sb);
|
|
blocksize = sb->s_blocksize;
|
|
if (!dentry->d_name.len)
|
|
return -EINVAL;
|
|
|
|
#ifdef CONFIG_UNICODE
|
|
if (ext4_has_strict_mode(sbi) && IS_CASEFOLDED(dir) &&
|
|
utf8_validate(sbi->s_encoding, &dentry->d_name))
|
|
return -EINVAL;
|
|
#endif
|
|
|
|
retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (ext4_has_inline_data(dir)) {
|
|
retval = ext4_try_add_inline_entry(handle, &fname, dir, inode);
|
|
if (retval < 0)
|
|
goto out;
|
|
if (retval == 1) {
|
|
retval = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (is_dx(dir)) {
|
|
retval = ext4_dx_add_entry(handle, &fname, dir, inode);
|
|
if (!retval || (retval != ERR_BAD_DX_DIR))
|
|
goto out;
|
|
ext4_clear_inode_flag(dir, EXT4_INODE_INDEX);
|
|
dx_fallback++;
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
}
|
|
blocks = dir->i_size >> sb->s_blocksize_bits;
|
|
for (block = 0; block < blocks; block++) {
|
|
bh = ext4_read_dirblock(dir, block, DIRENT);
|
|
if (bh == NULL) {
|
|
bh = ext4_bread(handle, dir, block,
|
|
EXT4_GET_BLOCKS_CREATE);
|
|
goto add_to_new_block;
|
|
}
|
|
if (IS_ERR(bh)) {
|
|
retval = PTR_ERR(bh);
|
|
bh = NULL;
|
|
goto out;
|
|
}
|
|
retval = add_dirent_to_buf(handle, &fname, dir, inode,
|
|
NULL, bh);
|
|
if (retval != -ENOSPC)
|
|
goto out;
|
|
|
|
if (blocks == 1 && !dx_fallback &&
|
|
ext4_has_feature_dir_index(sb)) {
|
|
retval = make_indexed_dir(handle, &fname, dir,
|
|
inode, bh);
|
|
bh = NULL; /* make_indexed_dir releases bh */
|
|
goto out;
|
|
}
|
|
brelse(bh);
|
|
}
|
|
bh = ext4_append(handle, dir, &block);
|
|
add_to_new_block:
|
|
if (IS_ERR(bh)) {
|
|
retval = PTR_ERR(bh);
|
|
bh = NULL;
|
|
goto out;
|
|
}
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
de->inode = 0;
|
|
de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize);
|
|
|
|
if (csum_size)
|
|
ext4_initialize_dirent_tail(bh, blocksize);
|
|
|
|
retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh);
|
|
out:
|
|
ext4_fname_free_filename(&fname);
|
|
brelse(bh);
|
|
if (retval == 0)
|
|
ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Returns 0 for success, or a negative error value
|
|
*/
|
|
static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
|
|
struct inode *dir, struct inode *inode)
|
|
{
|
|
struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
|
|
struct dx_entry *entries, *at;
|
|
struct buffer_head *bh;
|
|
struct super_block *sb = dir->i_sb;
|
|
struct ext4_dir_entry_2 *de;
|
|
int restart;
|
|
int err;
|
|
|
|
again:
|
|
restart = 0;
|
|
frame = dx_probe(fname, dir, NULL, frames);
|
|
if (IS_ERR(frame))
|
|
return PTR_ERR(frame);
|
|
entries = frame->entries;
|
|
at = frame->at;
|
|
bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT_HTREE);
|
|
if (IS_ERR(bh)) {
|
|
err = PTR_ERR(bh);
|
|
bh = NULL;
|
|
goto cleanup;
|
|
}
|
|
|
|
BUFFER_TRACE(bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, bh);
|
|
if (err)
|
|
goto journal_error;
|
|
|
|
err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh);
|
|
if (err != -ENOSPC)
|
|
goto cleanup;
|
|
|
|
err = 0;
|
|
/* Block full, should compress but for now just split */
|
|
dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n",
|
|
dx_get_count(entries), dx_get_limit(entries)));
|
|
/* Need to split index? */
|
|
if (dx_get_count(entries) == dx_get_limit(entries)) {
|
|
ext4_lblk_t newblock;
|
|
int levels = frame - frames + 1;
|
|
unsigned int icount;
|
|
int add_level = 1;
|
|
struct dx_entry *entries2;
|
|
struct dx_node *node2;
|
|
struct buffer_head *bh2;
|
|
|
|
while (frame > frames) {
|
|
if (dx_get_count((frame - 1)->entries) <
|
|
dx_get_limit((frame - 1)->entries)) {
|
|
add_level = 0;
|
|
break;
|
|
}
|
|
frame--; /* split higher index block */
|
|
at = frame->at;
|
|
entries = frame->entries;
|
|
restart = 1;
|
|
}
|
|
if (add_level && levels == ext4_dir_htree_level(sb)) {
|
|
ext4_warning(sb, "Directory (ino: %lu) index full, "
|
|
"reach max htree level :%d",
|
|
dir->i_ino, levels);
|
|
if (ext4_dir_htree_level(sb) < EXT4_HTREE_LEVEL) {
|
|
ext4_warning(sb, "Large directory feature is "
|
|
"not enabled on this "
|
|
"filesystem");
|
|
}
|
|
err = -ENOSPC;
|
|
goto cleanup;
|
|
}
|
|
icount = dx_get_count(entries);
|
|
bh2 = ext4_append(handle, dir, &newblock);
|
|
if (IS_ERR(bh2)) {
|
|
err = PTR_ERR(bh2);
|
|
goto cleanup;
|
|
}
|
|
node2 = (struct dx_node *)(bh2->b_data);
|
|
entries2 = node2->entries;
|
|
memset(&node2->fake, 0, sizeof(struct fake_dirent));
|
|
node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize,
|
|
sb->s_blocksize);
|
|
BUFFER_TRACE(frame->bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, frame->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
if (!add_level) {
|
|
unsigned icount1 = icount/2, icount2 = icount - icount1;
|
|
unsigned hash2 = dx_get_hash(entries + icount1);
|
|
dxtrace(printk(KERN_DEBUG "Split index %i/%i\n",
|
|
icount1, icount2));
|
|
|
|
BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
|
|
err = ext4_journal_get_write_access(handle,
|
|
(frame - 1)->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
|
|
memcpy((char *) entries2, (char *) (entries + icount1),
|
|
icount2 * sizeof(struct dx_entry));
|
|
dx_set_count(entries, icount1);
|
|
dx_set_count(entries2, icount2);
|
|
dx_set_limit(entries2, dx_node_limit(dir));
|
|
|
|
/* Which index block gets the new entry? */
|
|
if (at - entries >= icount1) {
|
|
frame->at = at = at - entries - icount1 + entries2;
|
|
frame->entries = entries = entries2;
|
|
swap(frame->bh, bh2);
|
|
}
|
|
dx_insert_block((frame - 1), hash2, newblock);
|
|
dxtrace(dx_show_index("node", frame->entries));
|
|
dxtrace(dx_show_index("node",
|
|
((struct dx_node *) bh2->b_data)->entries));
|
|
err = ext4_handle_dirty_dx_node(handle, dir, bh2);
|
|
if (err)
|
|
goto journal_error;
|
|
brelse (bh2);
|
|
err = ext4_handle_dirty_dx_node(handle, dir,
|
|
(frame - 1)->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
if (restart) {
|
|
err = ext4_handle_dirty_dx_node(handle, dir,
|
|
frame->bh);
|
|
goto journal_error;
|
|
}
|
|
} else {
|
|
struct dx_root *dxroot;
|
|
memcpy((char *) entries2, (char *) entries,
|
|
icount * sizeof(struct dx_entry));
|
|
dx_set_limit(entries2, dx_node_limit(dir));
|
|
|
|
/* Set up root */
|
|
dx_set_count(entries, 1);
|
|
dx_set_block(entries + 0, newblock);
|
|
dxroot = (struct dx_root *)frames[0].bh->b_data;
|
|
dxroot->info.indirect_levels += 1;
|
|
dxtrace(printk(KERN_DEBUG
|
|
"Creating %d level index...\n",
|
|
dxroot->info.indirect_levels));
|
|
err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
|
|
if (err)
|
|
goto journal_error;
|
|
err = ext4_handle_dirty_dx_node(handle, dir, bh2);
|
|
brelse(bh2);
|
|
restart = 1;
|
|
goto journal_error;
|
|
}
|
|
}
|
|
de = do_split(handle, dir, &bh, frame, &fname->hinfo);
|
|
if (IS_ERR(de)) {
|
|
err = PTR_ERR(de);
|
|
goto cleanup;
|
|
}
|
|
err = add_dirent_to_buf(handle, fname, dir, inode, de, bh);
|
|
goto cleanup;
|
|
|
|
journal_error:
|
|
ext4_std_error(dir->i_sb, err); /* this is a no-op if err == 0 */
|
|
cleanup:
|
|
brelse(bh);
|
|
dx_release(frames);
|
|
/* @restart is true means htree-path has been changed, we need to
|
|
* repeat dx_probe() to find out valid htree-path
|
|
*/
|
|
if (restart && err == 0)
|
|
goto again;
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ext4_generic_delete_entry deletes a directory entry by merging it
|
|
* with the previous entry
|
|
*/
|
|
int ext4_generic_delete_entry(handle_t *handle,
|
|
struct inode *dir,
|
|
struct ext4_dir_entry_2 *de_del,
|
|
struct buffer_head *bh,
|
|
void *entry_buf,
|
|
int buf_size,
|
|
int csum_size)
|
|
{
|
|
struct ext4_dir_entry_2 *de, *pde;
|
|
unsigned int blocksize = dir->i_sb->s_blocksize;
|
|
int i;
|
|
|
|
i = 0;
|
|
pde = NULL;
|
|
de = (struct ext4_dir_entry_2 *)entry_buf;
|
|
while (i < buf_size - csum_size) {
|
|
if (ext4_check_dir_entry(dir, NULL, de, bh,
|
|
bh->b_data, bh->b_size, i))
|
|
return -EFSCORRUPTED;
|
|
if (de == de_del) {
|
|
if (pde)
|
|
pde->rec_len = ext4_rec_len_to_disk(
|
|
ext4_rec_len_from_disk(pde->rec_len,
|
|
blocksize) +
|
|
ext4_rec_len_from_disk(de->rec_len,
|
|
blocksize),
|
|
blocksize);
|
|
else
|
|
de->inode = 0;
|
|
inode_inc_iversion(dir);
|
|
return 0;
|
|
}
|
|
i += ext4_rec_len_from_disk(de->rec_len, blocksize);
|
|
pde = de;
|
|
de = ext4_next_entry(de, blocksize);
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
static int ext4_delete_entry(handle_t *handle,
|
|
struct inode *dir,
|
|
struct ext4_dir_entry_2 *de_del,
|
|
struct buffer_head *bh)
|
|
{
|
|
int err, csum_size = 0;
|
|
|
|
if (ext4_has_inline_data(dir)) {
|
|
int has_inline_data = 1;
|
|
err = ext4_delete_inline_entry(handle, dir, de_del, bh,
|
|
&has_inline_data);
|
|
if (has_inline_data)
|
|
return err;
|
|
}
|
|
|
|
if (ext4_has_metadata_csum(dir->i_sb))
|
|
csum_size = sizeof(struct ext4_dir_entry_tail);
|
|
|
|
BUFFER_TRACE(bh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, bh);
|
|
if (unlikely(err))
|
|
goto out;
|
|
|
|
err = ext4_generic_delete_entry(handle, dir, de_del,
|
|
bh, bh->b_data,
|
|
dir->i_sb->s_blocksize, csum_size);
|
|
if (err)
|
|
goto out;
|
|
|
|
BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
|
|
err = ext4_handle_dirty_dirblock(handle, dir, bh);
|
|
if (unlikely(err))
|
|
goto out;
|
|
|
|
return 0;
|
|
out:
|
|
if (err != -ENOENT)
|
|
ext4_std_error(dir->i_sb, err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Set directory link count to 1 if nlinks > EXT4_LINK_MAX, or if nlinks == 2
|
|
* since this indicates that nlinks count was previously 1 to avoid overflowing
|
|
* the 16-bit i_links_count field on disk. Directories with i_nlink == 1 mean
|
|
* that subdirectory link counts are not being maintained accurately.
|
|
*
|
|
* The caller has already checked for i_nlink overflow in case the DIR_LINK
|
|
* feature is not enabled and returned -EMLINK. The is_dx() check is a proxy
|
|
* for checking S_ISDIR(inode) (since the INODE_INDEX feature will not be set
|
|
* on regular files) and to avoid creating huge/slow non-HTREE directories.
|
|
*/
|
|
static void ext4_inc_count(handle_t *handle, struct inode *inode)
|
|
{
|
|
inc_nlink(inode);
|
|
if (is_dx(inode) &&
|
|
(inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2))
|
|
set_nlink(inode, 1);
|
|
}
|
|
|
|
/*
|
|
* If a directory had nlink == 1, then we should let it be 1. This indicates
|
|
* directory has >EXT4_LINK_MAX subdirs.
|
|
*/
|
|
static void ext4_dec_count(handle_t *handle, struct inode *inode)
|
|
{
|
|
if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
|
|
drop_nlink(inode);
|
|
}
|
|
|
|
|
|
static int ext4_add_nondir(handle_t *handle,
|
|
struct dentry *dentry, struct inode *inode)
|
|
{
|
|
int err = ext4_add_entry(handle, dentry, inode);
|
|
if (!err) {
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
d_instantiate_new(dentry, inode);
|
|
return 0;
|
|
}
|
|
drop_nlink(inode);
|
|
unlock_new_inode(inode);
|
|
iput(inode);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* By the time this is called, we already have created
|
|
* the directory cache entry for the new file, but it
|
|
* is so far negative - it has no inode.
|
|
*
|
|
* If the create succeeds, we fill in the inode information
|
|
* with d_instantiate().
|
|
*/
|
|
static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode,
|
|
bool excl)
|
|
{
|
|
handle_t *handle;
|
|
struct inode *inode;
|
|
int err, credits, retries = 0;
|
|
|
|
err = dquot_initialize(dir);
|
|
if (err)
|
|
return err;
|
|
|
|
credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
|
|
retry:
|
|
inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
|
|
NULL, EXT4_HT_DIR, credits);
|
|
handle = ext4_journal_current_handle();
|
|
err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
inode->i_op = &ext4_file_inode_operations;
|
|
inode->i_fop = &ext4_file_operations;
|
|
ext4_set_aops(inode);
|
|
err = ext4_add_nondir(handle, dentry, inode);
|
|
if (!err && IS_DIRSYNC(dir))
|
|
ext4_handle_sync(handle);
|
|
}
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
}
|
|
|
|
static int ext4_mknod(struct inode *dir, struct dentry *dentry,
|
|
umode_t mode, dev_t rdev)
|
|
{
|
|
handle_t *handle;
|
|
struct inode *inode;
|
|
int err, credits, retries = 0;
|
|
|
|
err = dquot_initialize(dir);
|
|
if (err)
|
|
return err;
|
|
|
|
credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
|
|
retry:
|
|
inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
|
|
NULL, EXT4_HT_DIR, credits);
|
|
handle = ext4_journal_current_handle();
|
|
err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
init_special_inode(inode, inode->i_mode, rdev);
|
|
inode->i_op = &ext4_special_inode_operations;
|
|
err = ext4_add_nondir(handle, dentry, inode);
|
|
if (!err && IS_DIRSYNC(dir))
|
|
ext4_handle_sync(handle);
|
|
}
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
}
|
|
|
|
static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
handle_t *handle;
|
|
struct inode *inode;
|
|
int err, retries = 0;
|
|
|
|
err = dquot_initialize(dir);
|
|
if (err)
|
|
return err;
|
|
|
|
retry:
|
|
inode = ext4_new_inode_start_handle(dir, mode,
|
|
NULL, 0, NULL,
|
|
EXT4_HT_DIR,
|
|
EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
|
|
4 + EXT4_XATTR_TRANS_BLOCKS);
|
|
handle = ext4_journal_current_handle();
|
|
err = PTR_ERR(inode);
|
|
if (!IS_ERR(inode)) {
|
|
inode->i_op = &ext4_file_inode_operations;
|
|
inode->i_fop = &ext4_file_operations;
|
|
ext4_set_aops(inode);
|
|
d_tmpfile(dentry, inode);
|
|
err = ext4_orphan_add(handle, inode);
|
|
if (err)
|
|
goto err_unlock_inode;
|
|
mark_inode_dirty(inode);
|
|
unlock_new_inode(inode);
|
|
}
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
err_unlock_inode:
|
|
ext4_journal_stop(handle);
|
|
unlock_new_inode(inode);
|
|
return err;
|
|
}
|
|
|
|
struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
|
|
struct ext4_dir_entry_2 *de,
|
|
int blocksize, int csum_size,
|
|
unsigned int parent_ino, int dotdot_real_len)
|
|
{
|
|
de->inode = cpu_to_le32(inode->i_ino);
|
|
de->name_len = 1;
|
|
de->rec_len = ext4_rec_len_to_disk(EXT4_DIR_REC_LEN(de->name_len),
|
|
blocksize);
|
|
strcpy(de->name, ".");
|
|
ext4_set_de_type(inode->i_sb, de, S_IFDIR);
|
|
|
|
de = ext4_next_entry(de, blocksize);
|
|
de->inode = cpu_to_le32(parent_ino);
|
|
de->name_len = 2;
|
|
if (!dotdot_real_len)
|
|
de->rec_len = ext4_rec_len_to_disk(blocksize -
|
|
(csum_size + EXT4_DIR_REC_LEN(1)),
|
|
blocksize);
|
|
else
|
|
de->rec_len = ext4_rec_len_to_disk(
|
|
EXT4_DIR_REC_LEN(de->name_len), blocksize);
|
|
strcpy(de->name, "..");
|
|
ext4_set_de_type(inode->i_sb, de, S_IFDIR);
|
|
|
|
return ext4_next_entry(de, blocksize);
|
|
}
|
|
|
|
static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
|
|
struct inode *inode)
|
|
{
|
|
struct buffer_head *dir_block = NULL;
|
|
struct ext4_dir_entry_2 *de;
|
|
ext4_lblk_t block = 0;
|
|
unsigned int blocksize = dir->i_sb->s_blocksize;
|
|
int csum_size = 0;
|
|
int err;
|
|
|
|
if (ext4_has_metadata_csum(dir->i_sb))
|
|
csum_size = sizeof(struct ext4_dir_entry_tail);
|
|
|
|
if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
|
|
err = ext4_try_create_inline_dir(handle, dir, inode);
|
|
if (err < 0 && err != -ENOSPC)
|
|
goto out;
|
|
if (!err)
|
|
goto out;
|
|
}
|
|
|
|
inode->i_size = 0;
|
|
dir_block = ext4_append(handle, inode, &block);
|
|
if (IS_ERR(dir_block))
|
|
return PTR_ERR(dir_block);
|
|
de = (struct ext4_dir_entry_2 *)dir_block->b_data;
|
|
ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
|
|
set_nlink(inode, 2);
|
|
if (csum_size)
|
|
ext4_initialize_dirent_tail(dir_block, blocksize);
|
|
|
|
BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
|
|
err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
|
|
if (err)
|
|
goto out;
|
|
set_buffer_verified(dir_block);
|
|
out:
|
|
brelse(dir_block);
|
|
return err;
|
|
}
|
|
|
|
static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
|
|
{
|
|
handle_t *handle;
|
|
struct inode *inode;
|
|
int err, credits, retries = 0;
|
|
|
|
if (EXT4_DIR_LINK_MAX(dir))
|
|
return -EMLINK;
|
|
|
|
err = dquot_initialize(dir);
|
|
if (err)
|
|
return err;
|
|
|
|
credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
|
|
retry:
|
|
inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode,
|
|
&dentry->d_name,
|
|
0, NULL, EXT4_HT_DIR, credits);
|
|
handle = ext4_journal_current_handle();
|
|
err = PTR_ERR(inode);
|
|
if (IS_ERR(inode))
|
|
goto out_stop;
|
|
|
|
inode->i_op = &ext4_dir_inode_operations;
|
|
inode->i_fop = &ext4_dir_operations;
|
|
err = ext4_init_new_dir(handle, dir, inode);
|
|
if (err)
|
|
goto out_clear_inode;
|
|
err = ext4_mark_inode_dirty(handle, inode);
|
|
if (!err)
|
|
err = ext4_add_entry(handle, dentry, inode);
|
|
if (err) {
|
|
out_clear_inode:
|
|
clear_nlink(inode);
|
|
unlock_new_inode(inode);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
iput(inode);
|
|
goto out_stop;
|
|
}
|
|
ext4_inc_count(handle, dir);
|
|
ext4_update_dx_flag(dir);
|
|
err = ext4_mark_inode_dirty(handle, dir);
|
|
if (err)
|
|
goto out_clear_inode;
|
|
d_instantiate_new(dentry, inode);
|
|
if (IS_DIRSYNC(dir))
|
|
ext4_handle_sync(handle);
|
|
|
|
out_stop:
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* routine to check that the specified directory is empty (for rmdir)
|
|
*/
|
|
bool ext4_empty_dir(struct inode *inode)
|
|
{
|
|
unsigned int offset;
|
|
struct buffer_head *bh;
|
|
struct ext4_dir_entry_2 *de, *de1;
|
|
struct super_block *sb;
|
|
|
|
if (ext4_has_inline_data(inode)) {
|
|
int has_inline_data = 1;
|
|
int ret;
|
|
|
|
ret = empty_inline_dir(inode, &has_inline_data);
|
|
if (has_inline_data)
|
|
return ret;
|
|
}
|
|
|
|
sb = inode->i_sb;
|
|
if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) {
|
|
EXT4_ERROR_INODE(inode, "invalid size");
|
|
return true;
|
|
}
|
|
/* The first directory block must not be a hole,
|
|
* so treat it as DIRENT_HTREE
|
|
*/
|
|
bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
|
|
if (IS_ERR(bh))
|
|
return true;
|
|
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
de1 = ext4_next_entry(de, sb->s_blocksize);
|
|
if (le32_to_cpu(de->inode) != inode->i_ino ||
|
|
le32_to_cpu(de1->inode) == 0 ||
|
|
strcmp(".", de->name) || strcmp("..", de1->name)) {
|
|
ext4_warning_inode(inode, "directory missing '.' and/or '..'");
|
|
brelse(bh);
|
|
return true;
|
|
}
|
|
offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) +
|
|
ext4_rec_len_from_disk(de1->rec_len, sb->s_blocksize);
|
|
de = ext4_next_entry(de1, sb->s_blocksize);
|
|
while (offset < inode->i_size) {
|
|
if ((void *) de >= (void *) (bh->b_data+sb->s_blocksize)) {
|
|
unsigned int lblock;
|
|
brelse(bh);
|
|
lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb);
|
|
bh = ext4_read_dirblock(inode, lblock, EITHER);
|
|
if (bh == NULL) {
|
|
offset += sb->s_blocksize;
|
|
continue;
|
|
}
|
|
if (IS_ERR(bh))
|
|
return true;
|
|
de = (struct ext4_dir_entry_2 *) bh->b_data;
|
|
}
|
|
if (ext4_check_dir_entry(inode, NULL, de, bh,
|
|
bh->b_data, bh->b_size, offset)) {
|
|
de = (struct ext4_dir_entry_2 *)(bh->b_data +
|
|
sb->s_blocksize);
|
|
offset = (offset | (sb->s_blocksize - 1)) + 1;
|
|
continue;
|
|
}
|
|
if (le32_to_cpu(de->inode)) {
|
|
brelse(bh);
|
|
return false;
|
|
}
|
|
offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
|
|
de = ext4_next_entry(de, sb->s_blocksize);
|
|
}
|
|
brelse(bh);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* ext4_orphan_add() links an unlinked or truncated inode into a list of
|
|
* such inodes, starting at the superblock, in case we crash before the
|
|
* file is closed/deleted, or in case the inode truncate spans multiple
|
|
* transactions and the last transaction is not recovered after a crash.
|
|
*
|
|
* At filesystem recovery time, we walk this list deleting unlinked
|
|
* inodes and truncating linked inodes in ext4_orphan_cleanup().
|
|
*
|
|
* Orphan list manipulation functions must be called under i_mutex unless
|
|
* we are just creating the inode or deleting it.
|
|
*/
|
|
int ext4_orphan_add(handle_t *handle, struct inode *inode)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
struct ext4_iloc iloc;
|
|
int err = 0, rc;
|
|
bool dirty = false;
|
|
|
|
if (!sbi->s_journal || is_bad_inode(inode))
|
|
return 0;
|
|
|
|
WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
|
|
!inode_is_locked(inode));
|
|
/*
|
|
* Exit early if inode already is on orphan list. This is a big speedup
|
|
* since we don't have to contend on the global s_orphan_lock.
|
|
*/
|
|
if (!list_empty(&EXT4_I(inode)->i_orphan))
|
|
return 0;
|
|
|
|
/*
|
|
* Orphan handling is only valid for files with data blocks
|
|
* being truncated, or files being unlinked. Note that we either
|
|
* hold i_mutex, or the inode can not be referenced from outside,
|
|
* so i_nlink should not be bumped due to race
|
|
*/
|
|
J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
|
|
S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
|
|
|
|
BUFFER_TRACE(sbi->s_sbh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, sbi->s_sbh);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = ext4_reserve_inode_write(handle, inode, &iloc);
|
|
if (err)
|
|
goto out;
|
|
|
|
mutex_lock(&sbi->s_orphan_lock);
|
|
/*
|
|
* Due to previous errors inode may be already a part of on-disk
|
|
* orphan list. If so skip on-disk list modification.
|
|
*/
|
|
if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) >
|
|
(le32_to_cpu(sbi->s_es->s_inodes_count))) {
|
|
/* Insert this inode at the head of the on-disk orphan list */
|
|
NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan);
|
|
sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
|
|
dirty = true;
|
|
}
|
|
list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan);
|
|
mutex_unlock(&sbi->s_orphan_lock);
|
|
|
|
if (dirty) {
|
|
err = ext4_handle_dirty_super(handle, sb);
|
|
rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
|
|
if (!err)
|
|
err = rc;
|
|
if (err) {
|
|
/*
|
|
* We have to remove inode from in-memory list if
|
|
* addition to on disk orphan list failed. Stray orphan
|
|
* list entries can cause panics at unmount time.
|
|
*/
|
|
mutex_lock(&sbi->s_orphan_lock);
|
|
list_del_init(&EXT4_I(inode)->i_orphan);
|
|
mutex_unlock(&sbi->s_orphan_lock);
|
|
}
|
|
} else
|
|
brelse(iloc.bh);
|
|
|
|
jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
|
|
jbd_debug(4, "orphan inode %lu will point to %d\n",
|
|
inode->i_ino, NEXT_ORPHAN(inode));
|
|
out:
|
|
ext4_std_error(sb, err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ext4_orphan_del() removes an unlinked or truncated inode from the list
|
|
* of such inodes stored on disk, because it is finally being cleaned up.
|
|
*/
|
|
int ext4_orphan_del(handle_t *handle, struct inode *inode)
|
|
{
|
|
struct list_head *prev;
|
|
struct ext4_inode_info *ei = EXT4_I(inode);
|
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
|
|
__u32 ino_next;
|
|
struct ext4_iloc iloc;
|
|
int err = 0;
|
|
|
|
if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS))
|
|
return 0;
|
|
|
|
WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
|
|
!inode_is_locked(inode));
|
|
/* Do this quick check before taking global s_orphan_lock. */
|
|
if (list_empty(&ei->i_orphan))
|
|
return 0;
|
|
|
|
if (handle) {
|
|
/* Grab inode buffer early before taking global s_orphan_lock */
|
|
err = ext4_reserve_inode_write(handle, inode, &iloc);
|
|
}
|
|
|
|
mutex_lock(&sbi->s_orphan_lock);
|
|
jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
|
|
|
|
prev = ei->i_orphan.prev;
|
|
list_del_init(&ei->i_orphan);
|
|
|
|
/* If we're on an error path, we may not have a valid
|
|
* transaction handle with which to update the orphan list on
|
|
* disk, but we still need to remove the inode from the linked
|
|
* list in memory. */
|
|
if (!handle || err) {
|
|
mutex_unlock(&sbi->s_orphan_lock);
|
|
goto out_err;
|
|
}
|
|
|
|
ino_next = NEXT_ORPHAN(inode);
|
|
if (prev == &sbi->s_orphan) {
|
|
jbd_debug(4, "superblock will point to %u\n", ino_next);
|
|
BUFFER_TRACE(sbi->s_sbh, "get_write_access");
|
|
err = ext4_journal_get_write_access(handle, sbi->s_sbh);
|
|
if (err) {
|
|
mutex_unlock(&sbi->s_orphan_lock);
|
|
goto out_brelse;
|
|
}
|
|
sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
|
|
mutex_unlock(&sbi->s_orphan_lock);
|
|
err = ext4_handle_dirty_super(handle, inode->i_sb);
|
|
} else {
|
|
struct ext4_iloc iloc2;
|
|
struct inode *i_prev =
|
|
&list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode;
|
|
|
|
jbd_debug(4, "orphan inode %lu will point to %u\n",
|
|
i_prev->i_ino, ino_next);
|
|
err = ext4_reserve_inode_write(handle, i_prev, &iloc2);
|
|
if (err) {
|
|
mutex_unlock(&sbi->s_orphan_lock);
|
|
goto out_brelse;
|
|
}
|
|
NEXT_ORPHAN(i_prev) = ino_next;
|
|
err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2);
|
|
mutex_unlock(&sbi->s_orphan_lock);
|
|
}
|
|
if (err)
|
|
goto out_brelse;
|
|
NEXT_ORPHAN(inode) = 0;
|
|
err = ext4_mark_iloc_dirty(handle, inode, &iloc);
|
|
out_err:
|
|
ext4_std_error(inode->i_sb, err);
|
|
return err;
|
|
|
|
out_brelse:
|
|
brelse(iloc.bh);
|
|
goto out_err;
|
|
}
|
|
|
|
static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int retval;
|
|
struct inode *inode;
|
|
struct buffer_head *bh;
|
|
struct ext4_dir_entry_2 *de;
|
|
handle_t *handle = NULL;
|
|
|
|
if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
|
|
return -EIO;
|
|
|
|
/* Initialize quotas before so that eventual writes go in
|
|
* separate transaction */
|
|
retval = dquot_initialize(dir);
|
|
if (retval)
|
|
return retval;
|
|
retval = dquot_initialize(d_inode(dentry));
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = -ENOENT;
|
|
bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
|
|
if (IS_ERR(bh))
|
|
return PTR_ERR(bh);
|
|
if (!bh)
|
|
goto end_rmdir;
|
|
|
|
inode = d_inode(dentry);
|
|
|
|
retval = -EFSCORRUPTED;
|
|
if (le32_to_cpu(de->inode) != inode->i_ino)
|
|
goto end_rmdir;
|
|
|
|
retval = -ENOTEMPTY;
|
|
if (!ext4_empty_dir(inode))
|
|
goto end_rmdir;
|
|
|
|
handle = ext4_journal_start(dir, EXT4_HT_DIR,
|
|
EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
|
|
if (IS_ERR(handle)) {
|
|
retval = PTR_ERR(handle);
|
|
handle = NULL;
|
|
goto end_rmdir;
|
|
}
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
ext4_handle_sync(handle);
|
|
|
|
retval = ext4_delete_entry(handle, dir, de, bh);
|
|
if (retval)
|
|
goto end_rmdir;
|
|
if (!EXT4_DIR_LINK_EMPTY(inode))
|
|
ext4_warning_inode(inode,
|
|
"empty directory '%.*s' has too many links (%u)",
|
|
dentry->d_name.len, dentry->d_name.name,
|
|
inode->i_nlink);
|
|
inode_inc_iversion(inode);
|
|
clear_nlink(inode);
|
|
/* There's no need to set i_disksize: the fact that i_nlink is
|
|
* zero will ensure that the right thing happens during any
|
|
* recovery. */
|
|
inode->i_size = 0;
|
|
ext4_orphan_add(handle, inode);
|
|
inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
ext4_dec_count(handle, dir);
|
|
ext4_update_dx_flag(dir);
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
|
|
#ifdef CONFIG_UNICODE
|
|
/* VFS negative dentries are incompatible with Encoding and
|
|
* Case-insensitiveness. Eventually we'll want avoid
|
|
* invalidating the dentries here, alongside with returning the
|
|
* negative dentries at ext4_lookup(), when it is better
|
|
* supported by the VFS for the CI case.
|
|
*/
|
|
if (IS_CASEFOLDED(dir))
|
|
d_invalidate(dentry);
|
|
#endif
|
|
|
|
end_rmdir:
|
|
brelse(bh);
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
return retval;
|
|
}
|
|
|
|
static int ext4_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
int retval;
|
|
struct inode *inode;
|
|
struct buffer_head *bh;
|
|
struct ext4_dir_entry_2 *de;
|
|
handle_t *handle = NULL;
|
|
|
|
if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
|
|
return -EIO;
|
|
|
|
trace_ext4_unlink_enter(dir, dentry);
|
|
/* Initialize quotas before so that eventual writes go
|
|
* in separate transaction */
|
|
retval = dquot_initialize(dir);
|
|
if (retval)
|
|
return retval;
|
|
retval = dquot_initialize(d_inode(dentry));
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = -ENOENT;
|
|
bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
|
|
if (IS_ERR(bh))
|
|
return PTR_ERR(bh);
|
|
if (!bh)
|
|
goto end_unlink;
|
|
|
|
inode = d_inode(dentry);
|
|
|
|
retval = -EFSCORRUPTED;
|
|
if (le32_to_cpu(de->inode) != inode->i_ino)
|
|
goto end_unlink;
|
|
|
|
handle = ext4_journal_start(dir, EXT4_HT_DIR,
|
|
EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
|
|
if (IS_ERR(handle)) {
|
|
retval = PTR_ERR(handle);
|
|
handle = NULL;
|
|
goto end_unlink;
|
|
}
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
ext4_handle_sync(handle);
|
|
|
|
if (inode->i_nlink == 0) {
|
|
ext4_warning_inode(inode, "Deleting file '%.*s' with no links",
|
|
dentry->d_name.len, dentry->d_name.name);
|
|
set_nlink(inode, 1);
|
|
}
|
|
retval = ext4_delete_entry(handle, dir, de, bh);
|
|
if (retval)
|
|
goto end_unlink;
|
|
dir->i_ctime = dir->i_mtime = current_time(dir);
|
|
ext4_update_dx_flag(dir);
|
|
ext4_mark_inode_dirty(handle, dir);
|
|
drop_nlink(inode);
|
|
if (!inode->i_nlink)
|
|
ext4_orphan_add(handle, inode);
|
|
inode->i_ctime = current_time(inode);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
|
|
#ifdef CONFIG_UNICODE
|
|
/* VFS negative dentries are incompatible with Encoding and
|
|
* Case-insensitiveness. Eventually we'll want avoid
|
|
* invalidating the dentries here, alongside with returning the
|
|
* negative dentries at ext4_lookup(), when it is better
|
|
* supported by the VFS for the CI case.
|
|
*/
|
|
if (IS_CASEFOLDED(dir))
|
|
d_invalidate(dentry);
|
|
#endif
|
|
|
|
end_unlink:
|
|
brelse(bh);
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
trace_ext4_unlink_exit(dentry, retval);
|
|
return retval;
|
|
}
|
|
|
|
static int ext4_symlink(struct inode *dir,
|
|
struct dentry *dentry, const char *symname)
|
|
{
|
|
handle_t *handle;
|
|
struct inode *inode;
|
|
int err, len = strlen(symname);
|
|
int credits;
|
|
struct fscrypt_str disk_link;
|
|
|
|
if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
|
|
return -EIO;
|
|
|
|
err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
|
|
&disk_link);
|
|
if (err)
|
|
return err;
|
|
|
|
err = dquot_initialize(dir);
|
|
if (err)
|
|
return err;
|
|
|
|
if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
|
|
/*
|
|
* For non-fast symlinks, we just allocate inode and put it on
|
|
* orphan list in the first transaction => we need bitmap,
|
|
* group descriptor, sb, inode block, quota blocks, and
|
|
* possibly selinux xattr blocks.
|
|
*/
|
|
credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
|
|
EXT4_XATTR_TRANS_BLOCKS;
|
|
} else {
|
|
/*
|
|
* Fast symlink. We have to add entry to directory
|
|
* (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS),
|
|
* allocate new inode (bitmap, group descriptor, inode block,
|
|
* quota blocks, sb is already counted in previous macros).
|
|
*/
|
|
credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3;
|
|
}
|
|
|
|
inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO,
|
|
&dentry->d_name, 0, NULL,
|
|
EXT4_HT_DIR, credits);
|
|
handle = ext4_journal_current_handle();
|
|
if (IS_ERR(inode)) {
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
return PTR_ERR(inode);
|
|
}
|
|
|
|
if (IS_ENCRYPTED(inode)) {
|
|
err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
|
|
if (err)
|
|
goto err_drop_inode;
|
|
inode->i_op = &ext4_encrypted_symlink_inode_operations;
|
|
}
|
|
|
|
if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
|
|
if (!IS_ENCRYPTED(inode))
|
|
inode->i_op = &ext4_symlink_inode_operations;
|
|
inode_nohighmem(inode);
|
|
ext4_set_aops(inode);
|
|
/*
|
|
* We cannot call page_symlink() with transaction started
|
|
* because it calls into ext4_write_begin() which can wait
|
|
* for transaction commit if we are running out of space
|
|
* and thus we deadlock. So we have to stop transaction now
|
|
* and restart it when symlink contents is written.
|
|
*
|
|
* To keep fs consistent in case of crash, we have to put inode
|
|
* to orphan list in the mean time.
|
|
*/
|
|
drop_nlink(inode);
|
|
err = ext4_orphan_add(handle, inode);
|
|
ext4_journal_stop(handle);
|
|
handle = NULL;
|
|
if (err)
|
|
goto err_drop_inode;
|
|
err = __page_symlink(inode, disk_link.name, disk_link.len, 1);
|
|
if (err)
|
|
goto err_drop_inode;
|
|
/*
|
|
* Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS
|
|
* + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified
|
|
*/
|
|
handle = ext4_journal_start(dir, EXT4_HT_DIR,
|
|
EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1);
|
|
if (IS_ERR(handle)) {
|
|
err = PTR_ERR(handle);
|
|
handle = NULL;
|
|
goto err_drop_inode;
|
|
}
|
|
set_nlink(inode, 1);
|
|
err = ext4_orphan_del(handle, inode);
|
|
if (err)
|
|
goto err_drop_inode;
|
|
} else {
|
|
/* clear the extent format for fast symlink */
|
|
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
|
|
if (!IS_ENCRYPTED(inode)) {
|
|
inode->i_op = &ext4_fast_symlink_inode_operations;
|
|
inode->i_link = (char *)&EXT4_I(inode)->i_data;
|
|
}
|
|
memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name,
|
|
disk_link.len);
|
|
inode->i_size = disk_link.len - 1;
|
|
}
|
|
EXT4_I(inode)->i_disksize = inode->i_size;
|
|
err = ext4_add_nondir(handle, dentry, inode);
|
|
if (!err && IS_DIRSYNC(dir))
|
|
ext4_handle_sync(handle);
|
|
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
goto out_free_encrypted_link;
|
|
|
|
err_drop_inode:
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
clear_nlink(inode);
|
|
unlock_new_inode(inode);
|
|
iput(inode);
|
|
out_free_encrypted_link:
|
|
if (disk_link.name != (unsigned char *)symname)
|
|
kfree(disk_link.name);
|
|
return err;
|
|
}
|
|
|
|
static int ext4_link(struct dentry *old_dentry,
|
|
struct inode *dir, struct dentry *dentry)
|
|
{
|
|
handle_t *handle;
|
|
struct inode *inode = d_inode(old_dentry);
|
|
int err, retries = 0;
|
|
|
|
if (inode->i_nlink >= EXT4_LINK_MAX)
|
|
return -EMLINK;
|
|
|
|
err = fscrypt_prepare_link(old_dentry, dir, dentry);
|
|
if (err)
|
|
return err;
|
|
|
|
if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
|
|
(!projid_eq(EXT4_I(dir)->i_projid,
|
|
EXT4_I(old_dentry->d_inode)->i_projid)))
|
|
return -EXDEV;
|
|
|
|
err = dquot_initialize(dir);
|
|
if (err)
|
|
return err;
|
|
|
|
retry:
|
|
handle = ext4_journal_start(dir, EXT4_HT_DIR,
|
|
(EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
if (IS_DIRSYNC(dir))
|
|
ext4_handle_sync(handle);
|
|
|
|
inode->i_ctime = current_time(inode);
|
|
ext4_inc_count(handle, inode);
|
|
ihold(inode);
|
|
|
|
err = ext4_add_entry(handle, dentry, inode);
|
|
if (!err) {
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
/* this can happen only for tmpfile being
|
|
* linked the first time
|
|
*/
|
|
if (inode->i_nlink == 1)
|
|
ext4_orphan_del(handle, inode);
|
|
d_instantiate(dentry, inode);
|
|
} else {
|
|
drop_nlink(inode);
|
|
iput(inode);
|
|
}
|
|
ext4_journal_stop(handle);
|
|
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
|
|
goto retry;
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* Try to find buffer head where contains the parent block.
|
|
* It should be the inode block if it is inlined or the 1st block
|
|
* if it is a normal dir.
|
|
*/
|
|
static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
|
|
struct inode *inode,
|
|
int *retval,
|
|
struct ext4_dir_entry_2 **parent_de,
|
|
int *inlined)
|
|
{
|
|
struct buffer_head *bh;
|
|
|
|
if (!ext4_has_inline_data(inode)) {
|
|
/* The first directory block must not be a hole, so
|
|
* treat it as DIRENT_HTREE
|
|
*/
|
|
bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
|
|
if (IS_ERR(bh)) {
|
|
*retval = PTR_ERR(bh);
|
|
return NULL;
|
|
}
|
|
*parent_de = ext4_next_entry(
|
|
(struct ext4_dir_entry_2 *)bh->b_data,
|
|
inode->i_sb->s_blocksize);
|
|
return bh;
|
|
}
|
|
|
|
*inlined = 1;
|
|
return ext4_get_first_inline_block(inode, parent_de, retval);
|
|
}
|
|
|
|
struct ext4_renament {
|
|
struct inode *dir;
|
|
struct dentry *dentry;
|
|
struct inode *inode;
|
|
bool is_dir;
|
|
int dir_nlink_delta;
|
|
|
|
/* entry for "dentry" */
|
|
struct buffer_head *bh;
|
|
struct ext4_dir_entry_2 *de;
|
|
int inlined;
|
|
|
|
/* entry for ".." in inode if it's a directory */
|
|
struct buffer_head *dir_bh;
|
|
struct ext4_dir_entry_2 *parent_de;
|
|
int dir_inlined;
|
|
};
|
|
|
|
static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent)
|
|
{
|
|
int retval;
|
|
|
|
ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode,
|
|
&retval, &ent->parent_de,
|
|
&ent->dir_inlined);
|
|
if (!ent->dir_bh)
|
|
return retval;
|
|
if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino)
|
|
return -EFSCORRUPTED;
|
|
BUFFER_TRACE(ent->dir_bh, "get_write_access");
|
|
return ext4_journal_get_write_access(handle, ent->dir_bh);
|
|
}
|
|
|
|
static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent,
|
|
unsigned dir_ino)
|
|
{
|
|
int retval;
|
|
|
|
ent->parent_de->inode = cpu_to_le32(dir_ino);
|
|
BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata");
|
|
if (!ent->dir_inlined) {
|
|
if (is_dx(ent->inode)) {
|
|
retval = ext4_handle_dirty_dx_node(handle,
|
|
ent->inode,
|
|
ent->dir_bh);
|
|
} else {
|
|
retval = ext4_handle_dirty_dirblock(handle, ent->inode,
|
|
ent->dir_bh);
|
|
}
|
|
} else {
|
|
retval = ext4_mark_inode_dirty(handle, ent->inode);
|
|
}
|
|
if (retval) {
|
|
ext4_std_error(ent->dir->i_sb, retval);
|
|
return retval;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
|
|
unsigned ino, unsigned file_type)
|
|
{
|
|
int retval;
|
|
|
|
BUFFER_TRACE(ent->bh, "get write access");
|
|
retval = ext4_journal_get_write_access(handle, ent->bh);
|
|
if (retval)
|
|
return retval;
|
|
ent->de->inode = cpu_to_le32(ino);
|
|
if (ext4_has_feature_filetype(ent->dir->i_sb))
|
|
ent->de->file_type = file_type;
|
|
inode_inc_iversion(ent->dir);
|
|
ent->dir->i_ctime = ent->dir->i_mtime =
|
|
current_time(ent->dir);
|
|
ext4_mark_inode_dirty(handle, ent->dir);
|
|
BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata");
|
|
if (!ent->inlined) {
|
|
retval = ext4_handle_dirty_dirblock(handle, ent->dir, ent->bh);
|
|
if (unlikely(retval)) {
|
|
ext4_std_error(ent->dir->i_sb, retval);
|
|
return retval;
|
|
}
|
|
}
|
|
brelse(ent->bh);
|
|
ent->bh = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ext4_find_delete_entry(handle_t *handle, struct inode *dir,
|
|
const struct qstr *d_name)
|
|
{
|
|
int retval = -ENOENT;
|
|
struct buffer_head *bh;
|
|
struct ext4_dir_entry_2 *de;
|
|
|
|
bh = ext4_find_entry(dir, d_name, &de, NULL);
|
|
if (IS_ERR(bh))
|
|
return PTR_ERR(bh);
|
|
if (bh) {
|
|
retval = ext4_delete_entry(handle, dir, de, bh);
|
|
brelse(bh);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent,
|
|
int force_reread)
|
|
{
|
|
int retval;
|
|
/*
|
|
* ent->de could have moved from under us during htree split, so make
|
|
* sure that we are deleting the right entry. We might also be pointing
|
|
* to a stale entry in the unused part of ent->bh so just checking inum
|
|
* and the name isn't enough.
|
|
*/
|
|
if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino ||
|
|
ent->de->name_len != ent->dentry->d_name.len ||
|
|
strncmp(ent->de->name, ent->dentry->d_name.name,
|
|
ent->de->name_len) ||
|
|
force_reread) {
|
|
retval = ext4_find_delete_entry(handle, ent->dir,
|
|
&ent->dentry->d_name);
|
|
} else {
|
|
retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh);
|
|
if (retval == -ENOENT) {
|
|
retval = ext4_find_delete_entry(handle, ent->dir,
|
|
&ent->dentry->d_name);
|
|
}
|
|
}
|
|
|
|
if (retval) {
|
|
ext4_warning_inode(ent->dir,
|
|
"Deleting old file: nlink %d, error=%d",
|
|
ent->dir->i_nlink, retval);
|
|
}
|
|
}
|
|
|
|
static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
|
|
{
|
|
if (ent->dir_nlink_delta) {
|
|
if (ent->dir_nlink_delta == -1)
|
|
ext4_dec_count(handle, ent->dir);
|
|
else
|
|
ext4_inc_count(handle, ent->dir);
|
|
ext4_mark_inode_dirty(handle, ent->dir);
|
|
}
|
|
}
|
|
|
|
static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
|
|
int credits, handle_t **h)
|
|
{
|
|
struct inode *wh;
|
|
handle_t *handle;
|
|
int retries = 0;
|
|
|
|
/*
|
|
* for inode block, sb block, group summaries,
|
|
* and inode bitmap
|
|
*/
|
|
credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
|
|
EXT4_XATTR_TRANS_BLOCKS + 4);
|
|
retry:
|
|
wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE,
|
|
&ent->dentry->d_name, 0, NULL,
|
|
EXT4_HT_DIR, credits);
|
|
|
|
handle = ext4_journal_current_handle();
|
|
if (IS_ERR(wh)) {
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
if (PTR_ERR(wh) == -ENOSPC &&
|
|
ext4_should_retry_alloc(ent->dir->i_sb, &retries))
|
|
goto retry;
|
|
} else {
|
|
*h = handle;
|
|
init_special_inode(wh, wh->i_mode, WHITEOUT_DEV);
|
|
wh->i_op = &ext4_special_inode_operations;
|
|
}
|
|
return wh;
|
|
}
|
|
|
|
/*
|
|
* Anybody can rename anything with this: the permission checks are left to the
|
|
* higher-level routines.
|
|
*
|
|
* n.b. old_{dentry,inode) refers to the source dentry/inode
|
|
* while new_{dentry,inode) refers to the destination dentry/inode
|
|
* This comes from rename(const char *oldpath, const char *newpath)
|
|
*/
|
|
static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
handle_t *handle = NULL;
|
|
struct ext4_renament old = {
|
|
.dir = old_dir,
|
|
.dentry = old_dentry,
|
|
.inode = d_inode(old_dentry),
|
|
};
|
|
struct ext4_renament new = {
|
|
.dir = new_dir,
|
|
.dentry = new_dentry,
|
|
.inode = d_inode(new_dentry),
|
|
};
|
|
int force_reread;
|
|
int retval;
|
|
struct inode *whiteout = NULL;
|
|
int credits;
|
|
u8 old_file_type;
|
|
|
|
if (new.inode && new.inode->i_nlink == 0) {
|
|
EXT4_ERROR_INODE(new.inode,
|
|
"target of rename is already freed");
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) &&
|
|
(!projid_eq(EXT4_I(new_dir)->i_projid,
|
|
EXT4_I(old_dentry->d_inode)->i_projid)))
|
|
return -EXDEV;
|
|
|
|
retval = dquot_initialize(old.dir);
|
|
if (retval)
|
|
return retval;
|
|
retval = dquot_initialize(new.dir);
|
|
if (retval)
|
|
return retval;
|
|
|
|
/* Initialize quotas before so that eventual writes go
|
|
* in separate transaction */
|
|
if (new.inode) {
|
|
retval = dquot_initialize(new.inode);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL);
|
|
if (IS_ERR(old.bh))
|
|
return PTR_ERR(old.bh);
|
|
/*
|
|
* Check for inode number is _not_ due to possible IO errors.
|
|
* We might rmdir the source, keep it as pwd of some process
|
|
* and merrily kill the link to whatever was created under the
|
|
* same name. Goodbye sticky bit ;-<
|
|
*/
|
|
retval = -ENOENT;
|
|
if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
|
|
goto end_rename;
|
|
|
|
new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
|
|
&new.de, &new.inlined);
|
|
if (IS_ERR(new.bh)) {
|
|
retval = PTR_ERR(new.bh);
|
|
new.bh = NULL;
|
|
goto end_rename;
|
|
}
|
|
if (new.bh) {
|
|
if (!new.inode) {
|
|
brelse(new.bh);
|
|
new.bh = NULL;
|
|
}
|
|
}
|
|
if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
|
|
ext4_alloc_da_blocks(old.inode);
|
|
|
|
credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
|
|
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
|
|
if (!(flags & RENAME_WHITEOUT)) {
|
|
handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
|
|
if (IS_ERR(handle)) {
|
|
retval = PTR_ERR(handle);
|
|
handle = NULL;
|
|
goto end_rename;
|
|
}
|
|
} else {
|
|
whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
|
|
if (IS_ERR(whiteout)) {
|
|
retval = PTR_ERR(whiteout);
|
|
whiteout = NULL;
|
|
goto end_rename;
|
|
}
|
|
}
|
|
|
|
if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
|
|
ext4_handle_sync(handle);
|
|
|
|
if (S_ISDIR(old.inode->i_mode)) {
|
|
if (new.inode) {
|
|
retval = -ENOTEMPTY;
|
|
if (!ext4_empty_dir(new.inode))
|
|
goto end_rename;
|
|
} else {
|
|
retval = -EMLINK;
|
|
if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir))
|
|
goto end_rename;
|
|
}
|
|
retval = ext4_rename_dir_prepare(handle, &old);
|
|
if (retval)
|
|
goto end_rename;
|
|
}
|
|
/*
|
|
* If we're renaming a file within an inline_data dir and adding or
|
|
* setting the new dirent causes a conversion from inline_data to
|
|
* extents/blockmap, we need to force the dirent delete code to
|
|
* re-read the directory, or else we end up trying to delete a dirent
|
|
* from what is now the extent tree root (or a block map).
|
|
*/
|
|
force_reread = (new.dir->i_ino == old.dir->i_ino &&
|
|
ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
|
|
|
|
old_file_type = old.de->file_type;
|
|
if (whiteout) {
|
|
/*
|
|
* Do this before adding a new entry, so the old entry is sure
|
|
* to be still pointing to the valid old entry.
|
|
*/
|
|
retval = ext4_setent(handle, &old, whiteout->i_ino,
|
|
EXT4_FT_CHRDEV);
|
|
if (retval)
|
|
goto end_rename;
|
|
ext4_mark_inode_dirty(handle, whiteout);
|
|
}
|
|
if (!new.bh) {
|
|
retval = ext4_add_entry(handle, new.dentry, old.inode);
|
|
if (retval)
|
|
goto end_rename;
|
|
} else {
|
|
retval = ext4_setent(handle, &new,
|
|
old.inode->i_ino, old_file_type);
|
|
if (retval)
|
|
goto end_rename;
|
|
}
|
|
if (force_reread)
|
|
force_reread = !ext4_test_inode_flag(new.dir,
|
|
EXT4_INODE_INLINE_DATA);
|
|
|
|
/*
|
|
* Like most other Unix systems, set the ctime for inodes on a
|
|
* rename.
|
|
*/
|
|
old.inode->i_ctime = current_time(old.inode);
|
|
ext4_mark_inode_dirty(handle, old.inode);
|
|
|
|
if (!whiteout) {
|
|
/*
|
|
* ok, that's it
|
|
*/
|
|
ext4_rename_delete(handle, &old, force_reread);
|
|
}
|
|
|
|
if (new.inode) {
|
|
ext4_dec_count(handle, new.inode);
|
|
new.inode->i_ctime = current_time(new.inode);
|
|
}
|
|
old.dir->i_ctime = old.dir->i_mtime = current_time(old.dir);
|
|
ext4_update_dx_flag(old.dir);
|
|
if (old.dir_bh) {
|
|
retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
|
|
if (retval)
|
|
goto end_rename;
|
|
|
|
ext4_dec_count(handle, old.dir);
|
|
if (new.inode) {
|
|
/* checked ext4_empty_dir above, can't have another
|
|
* parent, ext4_dec_count() won't work for many-linked
|
|
* dirs */
|
|
clear_nlink(new.inode);
|
|
} else {
|
|
ext4_inc_count(handle, new.dir);
|
|
ext4_update_dx_flag(new.dir);
|
|
ext4_mark_inode_dirty(handle, new.dir);
|
|
}
|
|
}
|
|
ext4_mark_inode_dirty(handle, old.dir);
|
|
if (new.inode) {
|
|
ext4_mark_inode_dirty(handle, new.inode);
|
|
if (!new.inode->i_nlink)
|
|
ext4_orphan_add(handle, new.inode);
|
|
}
|
|
retval = 0;
|
|
|
|
end_rename:
|
|
brelse(old.dir_bh);
|
|
brelse(old.bh);
|
|
brelse(new.bh);
|
|
if (whiteout) {
|
|
if (retval)
|
|
drop_nlink(whiteout);
|
|
unlock_new_inode(whiteout);
|
|
iput(whiteout);
|
|
}
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
return retval;
|
|
}
|
|
|
|
static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
handle_t *handle = NULL;
|
|
struct ext4_renament old = {
|
|
.dir = old_dir,
|
|
.dentry = old_dentry,
|
|
.inode = d_inode(old_dentry),
|
|
};
|
|
struct ext4_renament new = {
|
|
.dir = new_dir,
|
|
.dentry = new_dentry,
|
|
.inode = d_inode(new_dentry),
|
|
};
|
|
u8 new_file_type;
|
|
int retval;
|
|
struct timespec64 ctime;
|
|
|
|
if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
|
|
!projid_eq(EXT4_I(new_dir)->i_projid,
|
|
EXT4_I(old_dentry->d_inode)->i_projid)) ||
|
|
(ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) &&
|
|
!projid_eq(EXT4_I(old_dir)->i_projid,
|
|
EXT4_I(new_dentry->d_inode)->i_projid)))
|
|
return -EXDEV;
|
|
|
|
retval = dquot_initialize(old.dir);
|
|
if (retval)
|
|
return retval;
|
|
retval = dquot_initialize(new.dir);
|
|
if (retval)
|
|
return retval;
|
|
|
|
old.bh = ext4_find_entry(old.dir, &old.dentry->d_name,
|
|
&old.de, &old.inlined);
|
|
if (IS_ERR(old.bh))
|
|
return PTR_ERR(old.bh);
|
|
/*
|
|
* Check for inode number is _not_ due to possible IO errors.
|
|
* We might rmdir the source, keep it as pwd of some process
|
|
* and merrily kill the link to whatever was created under the
|
|
* same name. Goodbye sticky bit ;-<
|
|
*/
|
|
retval = -ENOENT;
|
|
if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
|
|
goto end_rename;
|
|
|
|
new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
|
|
&new.de, &new.inlined);
|
|
if (IS_ERR(new.bh)) {
|
|
retval = PTR_ERR(new.bh);
|
|
new.bh = NULL;
|
|
goto end_rename;
|
|
}
|
|
|
|
/* RENAME_EXCHANGE case: old *and* new must both exist */
|
|
if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino)
|
|
goto end_rename;
|
|
|
|
handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
|
|
(2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
|
|
2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
|
|
if (IS_ERR(handle)) {
|
|
retval = PTR_ERR(handle);
|
|
handle = NULL;
|
|
goto end_rename;
|
|
}
|
|
|
|
if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
|
|
ext4_handle_sync(handle);
|
|
|
|
if (S_ISDIR(old.inode->i_mode)) {
|
|
old.is_dir = true;
|
|
retval = ext4_rename_dir_prepare(handle, &old);
|
|
if (retval)
|
|
goto end_rename;
|
|
}
|
|
if (S_ISDIR(new.inode->i_mode)) {
|
|
new.is_dir = true;
|
|
retval = ext4_rename_dir_prepare(handle, &new);
|
|
if (retval)
|
|
goto end_rename;
|
|
}
|
|
|
|
/*
|
|
* Other than the special case of overwriting a directory, parents'
|
|
* nlink only needs to be modified if this is a cross directory rename.
|
|
*/
|
|
if (old.dir != new.dir && old.is_dir != new.is_dir) {
|
|
old.dir_nlink_delta = old.is_dir ? -1 : 1;
|
|
new.dir_nlink_delta = -old.dir_nlink_delta;
|
|
retval = -EMLINK;
|
|
if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) ||
|
|
(new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir)))
|
|
goto end_rename;
|
|
}
|
|
|
|
new_file_type = new.de->file_type;
|
|
retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type);
|
|
if (retval)
|
|
goto end_rename;
|
|
|
|
retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type);
|
|
if (retval)
|
|
goto end_rename;
|
|
|
|
/*
|
|
* Like most other Unix systems, set the ctime for inodes on a
|
|
* rename.
|
|
*/
|
|
ctime = current_time(old.inode);
|
|
old.inode->i_ctime = ctime;
|
|
new.inode->i_ctime = ctime;
|
|
ext4_mark_inode_dirty(handle, old.inode);
|
|
ext4_mark_inode_dirty(handle, new.inode);
|
|
|
|
if (old.dir_bh) {
|
|
retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
|
|
if (retval)
|
|
goto end_rename;
|
|
}
|
|
if (new.dir_bh) {
|
|
retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino);
|
|
if (retval)
|
|
goto end_rename;
|
|
}
|
|
ext4_update_dir_count(handle, &old);
|
|
ext4_update_dir_count(handle, &new);
|
|
retval = 0;
|
|
|
|
end_rename:
|
|
brelse(old.dir_bh);
|
|
brelse(new.dir_bh);
|
|
brelse(old.bh);
|
|
brelse(new.bh);
|
|
if (handle)
|
|
ext4_journal_stop(handle);
|
|
return retval;
|
|
}
|
|
|
|
static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
int err;
|
|
|
|
if (unlikely(ext4_forced_shutdown(EXT4_SB(old_dir->i_sb))))
|
|
return -EIO;
|
|
|
|
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
|
|
return -EINVAL;
|
|
|
|
err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
|
|
flags);
|
|
if (err)
|
|
return err;
|
|
|
|
if (flags & RENAME_EXCHANGE) {
|
|
return ext4_cross_rename(old_dir, old_dentry,
|
|
new_dir, new_dentry);
|
|
}
|
|
|
|
return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
|
|
}
|
|
|
|
/*
|
|
* directories can handle most operations...
|
|
*/
|
|
const struct inode_operations ext4_dir_inode_operations = {
|
|
.create = ext4_create,
|
|
.lookup = ext4_lookup,
|
|
.link = ext4_link,
|
|
.unlink = ext4_unlink,
|
|
.symlink = ext4_symlink,
|
|
.mkdir = ext4_mkdir,
|
|
.rmdir = ext4_rmdir,
|
|
.mknod = ext4_mknod,
|
|
.tmpfile = ext4_tmpfile,
|
|
.rename = ext4_rename2,
|
|
.setattr = ext4_setattr,
|
|
.getattr = ext4_getattr,
|
|
.listxattr = ext4_listxattr,
|
|
.get_acl = ext4_get_acl,
|
|
.set_acl = ext4_set_acl,
|
|
.fiemap = ext4_fiemap,
|
|
};
|
|
|
|
const struct inode_operations ext4_special_inode_operations = {
|
|
.setattr = ext4_setattr,
|
|
.getattr = ext4_getattr,
|
|
.listxattr = ext4_listxattr,
|
|
.get_acl = ext4_get_acl,
|
|
.set_acl = ext4_set_acl,
|
|
};
|