Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-27 06:31:52 +00:00
Code Issues Packages Projects Releases Wiki Activity
805ddc2042
linux/fs/udf/namei.c
Jan Kara 27ab338548 udf: Fix bogus checksum computation in udf_rename() 
Syzbot reports uninitialized memory access in udf_rename() when updating
checksum of '..' directory entry of a moved directory. This is indeed
true as we pass on-stack diriter.fi to the udf_update_tag() and because
that has only struct fileIdentDesc included in it and not the impUse or
name fields, the checksumming function is going to checksum random stack
contents beyond the end of the structure. This is actually harmless
because the following udf_fiiter_write_fi() will recompute the checksum
from on-disk buffers where everything is properly included. So all that
is needed is just removing the bogus calculation.

Fixes: e9109a92d2 ("udf: Convert udf_rename() to new directory iteration code")
Link: https://lore.kernel.org/all/000000000000cf405f060d8f75a9@google.com/T/
Link: https://patch.msgid.link/20240617154201.29512-1-jack@suse.cz
Reported-by: syzbot+d31185aa54170f7fc1f5@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
2024-06-20 15:07:27 +02:00

1015 lines
26 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0-only
/*
* namei.c
*
* PURPOSE
* Inode name handling routines for the OSTA-UDF(tm) filesystem.
*
* COPYRIGHT
* (C) 1998-2004 Ben Fennema
* (C) 1999-2000 Stelias Computing Inc
*
* HISTORY
*
* 12/12/98 blf Created. Split out the lookup code from dir.c
* 04/19/99 blf link, mknod, symlink support
*/
#include "udfdecl.h"
#include "udf_i.h"
#include "udf_sb.h"
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <linux/crc-itu-t.h>
#include <linux/exportfs.h>
#include <linux/iversion.h>
static inline int udf_match(int len1, const unsigned char *name1, int len2,
const unsigned char *name2)
{
if (len1 != len2)
return 0;
return !memcmp(name1, name2, len1);
}
/**
* udf_fiiter_find_entry - find entry in given directory.
*
* @dir: directory inode to search in
* @child: qstr of the name
* @iter: iter to use for searching
*
* This function searches in the directory @dir for a file name @child. When
* found, @iter points to the position in the directory with given entry.
*
* Returns 0 on success, < 0 on error (including -ENOENT).
*/
static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child,
struct udf_fileident_iter *iter)
{
int flen;
unsigned char *fname = NULL;
struct super_block *sb = dir->i_sb;
int isdotdot = child->len == 2 &&
child->name[0] == '.' && child->name[1] == '.';
int ret;
fname = kmalloc(UDF_NAME_LEN, GFP_KERNEL);
if (!fname)
return -ENOMEM;
for (ret = udf_fiiter_init(iter, dir, 0);
!ret && iter->pos < dir->i_size;
ret = udf_fiiter_advance(iter)) {
if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
continue;
}
if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) {
if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
continue;
}
if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) &&
isdotdot)
goto out_ok;
if (!iter->fi.lengthFileIdent)
continue;
flen = udf_get_filename(sb, iter->name,
iter->fi.lengthFileIdent, fname, UDF_NAME_LEN);
if (flen < 0) {
ret = flen;
goto out_err;
}
if (udf_match(flen, fname, child->len, child->name))
goto out_ok;
}
if (!ret)
ret = -ENOENT;
out_err:
udf_fiiter_release(iter);
out_ok:
kfree(fname);
return ret;
}
static struct dentry *udf_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
struct inode *inode = NULL;
struct udf_fileident_iter iter;
int err;
if (dentry->d_name.len > UDF_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
err = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
if (err < 0 && err != -ENOENT)
return ERR_PTR(err);
if (err == 0) {
struct kernel_lb_addr loc;
loc = lelb_to_cpu(iter.fi.icb.extLocation);
udf_fiiter_release(&iter);
inode = udf_iget(dir->i_sb, &loc);
}
return d_splice_alias(inode, dentry);
}
static int udf_expand_dir_adinicb(struct inode *inode, udf_pblk_t *block)
{
udf_pblk_t newblock;
struct buffer_head *dbh = NULL;
struct kernel_lb_addr eloc;
struct extent_position epos;
uint8_t alloctype;
struct udf_inode_info *iinfo = UDF_I(inode);
struct udf_fileident_iter iter;
uint8_t *impuse;
int ret;
if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
alloctype = ICBTAG_FLAG_AD_SHORT;
else
alloctype = ICBTAG_FLAG_AD_LONG;
if (!inode->i_size) {
iinfo->i_alloc_type = alloctype;
mark_inode_dirty(inode);
return 0;
}
/* alloc block, and copy data to it */
*block = udf_new_block(inode->i_sb, inode,
iinfo->i_location.partitionReferenceNum,
iinfo->i_location.logicalBlockNum, &ret);
if (!(*block))
return ret;
newblock = udf_get_pblock(inode->i_sb, *block,
iinfo->i_location.partitionReferenceNum,
0);
if (newblock == 0xffffffff)
return -EFSCORRUPTED;
dbh = sb_getblk(inode->i_sb, newblock);
if (!dbh)
return -ENOMEM;
lock_buffer(dbh);
memcpy(dbh->b_data, iinfo->i_data, inode->i_size);
memset(dbh->b_data + inode->i_size, 0,
inode->i_sb->s_blocksize - inode->i_size);
set_buffer_uptodate(dbh);
unlock_buffer(dbh);
/* Drop inline data, add block instead */
iinfo->i_alloc_type = alloctype;
memset(iinfo->i_data + iinfo->i_lenEAttr, 0, iinfo->i_lenAlloc);
iinfo->i_lenAlloc = 0;
eloc.logicalBlockNum = *block;
eloc.partitionReferenceNum =
iinfo->i_location.partitionReferenceNum;
iinfo->i_lenExtents = inode->i_size;
epos.bh = NULL;
epos.block = iinfo->i_location;
epos.offset = udf_file_entry_alloc_offset(inode);
ret = udf_add_aext(inode, &epos, &eloc, inode->i_size, 0);
brelse(epos.bh);
if (ret < 0) {
brelse(dbh);
udf_free_blocks(inode->i_sb, inode, &eloc, 0, 1);
return ret;
}
mark_inode_dirty(inode);
/* Now fixup tags in moved directory entries */
for (ret = udf_fiiter_init(&iter, inode, 0);
!ret && iter.pos < inode->i_size;
ret = udf_fiiter_advance(&iter)) {
iter.fi.descTag.tagLocation = cpu_to_le32(*block);
if (iter.fi.lengthOfImpUse != cpu_to_le16(0))
impuse = dbh->b_data + iter.pos +
sizeof(struct fileIdentDesc);
else
impuse = NULL;
udf_fiiter_write_fi(&iter, impuse);
}
brelse(dbh);
/*
* We don't expect the iteration to fail as the directory has been
* already verified to be correct
*/
WARN_ON_ONCE(ret);
udf_fiiter_release(&iter);
return 0;
}
static int udf_fiiter_add_entry(struct inode *dir, struct dentry *dentry,
struct udf_fileident_iter *iter)
{
struct udf_inode_info *dinfo = UDF_I(dir);
int nfidlen, namelen = 0;
int ret;
int off, blksize = 1 << dir->i_blkbits;
udf_pblk_t block;
char name[UDF_NAME_LEN_CS0];
if (dentry) {
namelen = udf_put_filename(dir->i_sb, dentry->d_name.name,
dentry->d_name.len,
name, UDF_NAME_LEN_CS0);
if (!namelen)
return -ENAMETOOLONG;
}
nfidlen = ALIGN(sizeof(struct fileIdentDesc) + namelen, UDF_NAME_PAD);
for (ret = udf_fiiter_init(iter, dir, 0);
!ret && iter->pos < dir->i_size;
ret = udf_fiiter_advance(iter)) {
if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
if (udf_dir_entry_len(&iter->fi) == nfidlen) {
iter->fi.descTag.tagSerialNum = cpu_to_le16(1);
iter->fi.fileVersionNum = cpu_to_le16(1);
iter->fi.fileCharacteristics = 0;
iter->fi.lengthFileIdent = namelen;
iter->fi.lengthOfImpUse = cpu_to_le16(0);
memcpy(iter->namebuf, name, namelen);
iter->name = iter->namebuf;
return 0;
}
}
}
if (ret) {
udf_fiiter_release(iter);
return ret;
}
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
blksize - udf_ext0_offset(dir) - iter->pos < nfidlen) {
udf_fiiter_release(iter);
ret = udf_expand_dir_adinicb(dir, &block);
if (ret)
return ret;
ret = udf_fiiter_init(iter, dir, dir->i_size);
if (ret < 0)
return ret;
}
/* Get blocknumber to use for entry tag */
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
block = dinfo->i_location.logicalBlockNum;
} else {
block = iter->eloc.logicalBlockNum +
((iter->elen - 1) >> dir->i_blkbits);
}
off = iter->pos & (blksize - 1);
if (!off)
off = blksize;
/* Entry fits into current block? */
if (blksize - udf_ext0_offset(dir) - off >= nfidlen)
goto store_fi;
ret = udf_fiiter_append_blk(iter);
if (ret) {
udf_fiiter_release(iter);
return ret;
}
/* Entry will be completely in the new block? Update tag location... */
if (!(iter->pos & (blksize - 1)))
block = iter->eloc.logicalBlockNum +
((iter->elen - 1) >> dir->i_blkbits);
store_fi:
memset(&iter->fi, 0, sizeof(struct fileIdentDesc));
if (UDF_SB(dir->i_sb)->s_udfrev >= 0x0200)
udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 3, 1, block,
sizeof(struct tag));
else
udf_new_tag((char *)(&iter->fi), TAG_IDENT_FID, 2, 1, block,
sizeof(struct tag));
iter->fi.fileVersionNum = cpu_to_le16(1);
iter->fi.lengthFileIdent = namelen;
iter->fi.lengthOfImpUse = cpu_to_le16(0);
memcpy(iter->namebuf, name, namelen);
iter->name = iter->namebuf;
dir->i_size += nfidlen;
if (dinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
dinfo->i_lenAlloc += nfidlen;
} else {
/* Truncate last extent to proper size */
udf_fiiter_update_elen(iter, iter->elen -
(dinfo->i_lenExtents - dir->i_size));
}
mark_inode_dirty(dir);
return 0;
}
static void udf_fiiter_delete_entry(struct udf_fileident_iter *iter)
{
iter->fi.fileCharacteristics |= FID_FILE_CHAR_DELETED;
if (UDF_QUERY_FLAG(iter->dir->i_sb, UDF_FLAG_STRICT))
memset(&iter->fi.icb, 0x00, sizeof(struct long_ad));
udf_fiiter_write_fi(iter, NULL);
}
static void udf_add_fid_counter(struct super_block *sb, bool dir, int val)
{
struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
if (!lvidiu)
return;
mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
if (dir)
le32_add_cpu(&lvidiu->numDirs, val);
else
le32_add_cpu(&lvidiu->numFiles, val);
udf_updated_lvid(sb);
mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
}
static int udf_add_nondir(struct dentry *dentry, struct inode *inode)
{
struct udf_inode_info *iinfo = UDF_I(inode);
struct inode *dir = d_inode(dentry->d_parent);
struct udf_fileident_iter iter;
int err;
err = udf_fiiter_add_entry(dir, dentry, &iter);
if (err) {
inode_dec_link_count(inode);
discard_new_inode(inode);
return err;
}
iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
udf_fiiter_write_fi(&iter, NULL);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
mark_inode_dirty(dir);
udf_fiiter_release(&iter);
udf_add_fid_counter(dir->i_sb, false, 1);
d_instantiate_new(dentry, inode);
return 0;
}
static int udf_create(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode, bool excl)
{
struct inode *inode = udf_new_inode(dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
inode->i_data.a_ops = &udf_aops;
inode->i_op = &udf_file_inode_operations;
inode->i_fop = &udf_file_operations;
mark_inode_dirty(inode);
return udf_add_nondir(dentry, inode);
}
static int udf_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
struct file *file, umode_t mode)
{
struct inode *inode = udf_new_inode(dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
inode->i_data.a_ops = &udf_aops;
inode->i_op = &udf_file_inode_operations;
inode->i_fop = &udf_file_operations;
mark_inode_dirty(inode);
d_tmpfile(file, inode);
unlock_new_inode(inode);
return finish_open_simple(file, 0);
}
static int udf_mknod(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode, dev_t rdev)
{
struct inode *inode;
if (!old_valid_dev(rdev))
return -EINVAL;
inode = udf_new_inode(dir, mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
init_special_inode(inode, mode, rdev);
return udf_add_nondir(dentry, inode);
}
static int udf_mkdir(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode)
{
struct inode *inode;
struct udf_fileident_iter iter;
int err;
struct udf_inode_info *dinfo = UDF_I(dir);
struct udf_inode_info *iinfo;
inode = udf_new_inode(dir, S_IFDIR | mode);
if (IS_ERR(inode))
return PTR_ERR(inode);
iinfo = UDF_I(inode);
inode->i_op = &udf_dir_inode_operations;
inode->i_fop = &udf_dir_operations;
err = udf_fiiter_add_entry(inode, NULL, &iter);
if (err) {
clear_nlink(inode);
discard_new_inode(inode);
return err;
}
set_nlink(inode, 2);
iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
iter.fi.icb.extLocation = cpu_to_lelb(dinfo->i_location);
*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
cpu_to_le32(dinfo->i_unique & 0x00000000FFFFFFFFUL);
iter.fi.fileCharacteristics =
FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
udf_fiiter_write_fi(&iter, NULL);
udf_fiiter_release(&iter);
mark_inode_dirty(inode);
err = udf_fiiter_add_entry(dir, dentry, &iter);
if (err) {
clear_nlink(inode);
discard_new_inode(inode);
return err;
}
iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
iter.fi.icb.extLocation = cpu_to_lelb(iinfo->i_location);
*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
cpu_to_le32(iinfo->i_unique & 0x00000000FFFFFFFFUL);
iter.fi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
udf_fiiter_write_fi(&iter, NULL);
udf_fiiter_release(&iter);
udf_add_fid_counter(dir->i_sb, true, 1);
inc_nlink(dir);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
mark_inode_dirty(dir);
d_instantiate_new(dentry, inode);
return 0;
}
static int empty_dir(struct inode *dir)
{
struct udf_fileident_iter iter;
int ret;
for (ret = udf_fiiter_init(&iter, dir, 0);
!ret && iter.pos < dir->i_size;
ret = udf_fiiter_advance(&iter)) {
if (iter.fi.lengthFileIdent &&
!(iter.fi.fileCharacteristics & FID_FILE_CHAR_DELETED)) {
udf_fiiter_release(&iter);
return 0;
}
}
udf_fiiter_release(&iter);
return 1;
}
static int udf_rmdir(struct inode *dir, struct dentry *dentry)
{
int ret;
struct inode *inode = d_inode(dentry);
struct udf_fileident_iter iter;
struct kernel_lb_addr tloc;
ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
if (ret)
goto out;
ret = -EFSCORRUPTED;
tloc = lelb_to_cpu(iter.fi.icb.extLocation);
if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
goto end_rmdir;
ret = -ENOTEMPTY;
if (!empty_dir(inode))
goto end_rmdir;
udf_fiiter_delete_entry(&iter);
if (inode->i_nlink != 2)
udf_warn(inode->i_sb, "empty directory has nlink != 2 (%u)\n",
inode->i_nlink);
clear_nlink(inode);
inode->i_size = 0;
inode_dec_link_count(dir);
udf_add_fid_counter(dir->i_sb, true, -1);
inode_set_mtime_to_ts(dir,
inode_set_ctime_to_ts(dir, inode_set_ctime_current(inode)));
mark_inode_dirty(dir);
ret = 0;
end_rmdir:
udf_fiiter_release(&iter);
out:
return ret;
}
static int udf_unlink(struct inode *dir, struct dentry *dentry)
{
int ret;
struct inode *inode = d_inode(dentry);
struct udf_fileident_iter iter;
struct kernel_lb_addr tloc;
ret = udf_fiiter_find_entry(dir, &dentry->d_name, &iter);
if (ret)
goto out;
ret = -EFSCORRUPTED;
tloc = lelb_to_cpu(iter.fi.icb.extLocation);
if (udf_get_lb_pblock(dir->i_sb, &tloc, 0) != inode->i_ino)
goto end_unlink;
if (!inode->i_nlink) {
udf_debug("Deleting nonexistent file (%lu), %u\n",
inode->i_ino, inode->i_nlink);
set_nlink(inode, 1);
}
udf_fiiter_delete_entry(&iter);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
mark_inode_dirty(dir);
inode_dec_link_count(inode);
udf_add_fid_counter(dir->i_sb, false, -1);
inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
ret = 0;
end_unlink:
udf_fiiter_release(&iter);
out:
return ret;
}
static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, const char *symname)
{
struct inode *inode;
struct pathComponent *pc;
const char *compstart;
struct extent_position epos = {};
int eoffset, elen = 0;
uint8_t *ea;
int err;
udf_pblk_t block;
unsigned char *name = NULL;
int namelen;
struct udf_inode_info *iinfo;
struct super_block *sb = dir->i_sb;
name = kmalloc(UDF_NAME_LEN_CS0, GFP_KERNEL);
if (!name) {
err = -ENOMEM;
goto out;
}
inode = udf_new_inode(dir, S_IFLNK | 0777);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto out;
}
iinfo = UDF_I(inode);
down_write(&iinfo->i_data_sem);
inode->i_data.a_ops = &udf_symlink_aops;
inode->i_op = &udf_symlink_inode_operations;
inode_nohighmem(inode);
if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
struct kernel_lb_addr eloc;
uint32_t bsize;
block = udf_new_block(sb, inode,
iinfo->i_location.partitionReferenceNum,
iinfo->i_location.logicalBlockNum, &err);
if (!block)
goto out_no_entry;
epos.block = iinfo->i_location;
epos.offset = udf_file_entry_alloc_offset(inode);
epos.bh = NULL;
eloc.logicalBlockNum = block;
eloc.partitionReferenceNum =
iinfo->i_location.partitionReferenceNum;
bsize = sb->s_blocksize;
iinfo->i_lenExtents = bsize;
err = udf_add_aext(inode, &epos, &eloc, bsize, 0);
brelse(epos.bh);
if (err < 0) {
udf_free_blocks(sb, inode, &eloc, 0, 1);
goto out_no_entry;
}
block = udf_get_pblock(sb, block,
iinfo->i_location.partitionReferenceNum,
0);
epos.bh = sb_getblk(sb, block);
if (unlikely(!epos.bh)) {
err = -ENOMEM;
udf_free_blocks(sb, inode, &eloc, 0, 1);
goto out_no_entry;
}
lock_buffer(epos.bh);
memset(epos.bh->b_data, 0x00, bsize);
set_buffer_uptodate(epos.bh);
unlock_buffer(epos.bh);
mark_buffer_dirty_inode(epos.bh, inode);
ea = epos.bh->b_data + udf_ext0_offset(inode);
} else
ea = iinfo->i_data + iinfo->i_lenEAttr;
eoffset = sb->s_blocksize - udf_ext0_offset(inode);
pc = (struct pathComponent *)ea;
if (*symname == '/') {
do {
symname++;
} while (*symname == '/');
pc->componentType = 1;
pc->lengthComponentIdent = 0;
pc->componentFileVersionNum = 0;
elen += sizeof(struct pathComponent);
}
err = -ENAMETOOLONG;
while (*symname) {
if (elen + sizeof(struct pathComponent) > eoffset)
goto out_no_entry;
pc = (struct pathComponent *)(ea + elen);
compstart = symname;
do {
symname++;
} while (*symname && *symname != '/');
pc->componentType = 5;
pc->lengthComponentIdent = 0;
pc->componentFileVersionNum = 0;
if (compstart[0] == '.') {
if ((symname - compstart) == 1)
pc->componentType = 4;
else if ((symname - compstart) == 2 &&
compstart[1] == '.')
pc->componentType = 3;
}
if (pc->componentType == 5) {
namelen = udf_put_filename(sb, compstart,
symname - compstart,
name, UDF_NAME_LEN_CS0);
if (!namelen)
goto out_no_entry;
if (elen + sizeof(struct pathComponent) + namelen >
eoffset)
goto out_no_entry;
else
pc->lengthComponentIdent = namelen;
memcpy(pc->componentIdent, name, namelen);
}
elen += sizeof(struct pathComponent) + pc->lengthComponentIdent;
if (*symname) {
do {
symname++;
} while (*symname == '/');
}
}
brelse(epos.bh);
inode->i_size = elen;
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
iinfo->i_lenAlloc = inode->i_size;
else
udf_truncate_tail_extent(inode);
mark_inode_dirty(inode);
up_write(&iinfo->i_data_sem);
err = udf_add_nondir(dentry, inode);
out:
kfree(name);
return err;
out_no_entry:
up_write(&iinfo->i_data_sem);
inode_dec_link_count(inode);
discard_new_inode(inode);
goto out;
}
static int udf_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
struct inode *inode = d_inode(old_dentry);
struct udf_fileident_iter iter;
int err;
err = udf_fiiter_add_entry(dir, dentry, &iter);
if (err)
return err;
iter.fi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
iter.fi.icb.extLocation = cpu_to_lelb(UDF_I(inode)->i_location);
if (UDF_SB(inode->i_sb)->s_lvid_bh) {
*(__le32 *)((struct allocDescImpUse *)iter.fi.icb.impUse)->impUse =
cpu_to_le32(lvid_get_unique_id(inode->i_sb));
}
udf_fiiter_write_fi(&iter, NULL);
udf_fiiter_release(&iter);
inc_nlink(inode);
udf_add_fid_counter(dir->i_sb, false, 1);
inode_set_ctime_current(inode);
mark_inode_dirty(inode);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
mark_inode_dirty(dir);
ihold(inode);
d_instantiate(dentry, inode);
return 0;
}
/* Anybody can rename anything with this: the permission checks are left to the
* higher-level routines.
*/
static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
struct dentry *old_dentry, struct inode *new_dir,
struct dentry *new_dentry, unsigned int flags)
{
struct inode *old_inode = d_inode(old_dentry);
struct inode *new_inode = d_inode(new_dentry);
struct udf_fileident_iter oiter, niter, diriter;
bool has_diriter = false, is_dir = false;
int retval;
struct kernel_lb_addr tloc;
if (flags & ~RENAME_NOREPLACE)
return -EINVAL;
retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
if (retval)
return retval;
tloc = lelb_to_cpu(oiter.fi.icb.extLocation);
if (udf_get_lb_pblock(old_dir->i_sb, &tloc, 0) != old_inode->i_ino) {
retval = -ENOENT;
goto out_oiter;
}
if (S_ISDIR(old_inode->i_mode)) {
if (new_inode) {
retval = -ENOTEMPTY;
if (!empty_dir(new_inode))
goto out_oiter;
}
is_dir = true;
}
if (is_dir && old_dir != new_dir) {
retval = udf_fiiter_find_entry(old_inode, &dotdot_name,
&diriter);
if (retval == -ENOENT) {
udf_err(old_inode->i_sb,
"directory (ino %lu) has no '..' entry\n",
old_inode->i_ino);
retval = -EFSCORRUPTED;
}
if (retval)
goto out_oiter;
has_diriter = true;
tloc = lelb_to_cpu(diriter.fi.icb.extLocation);
if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
old_dir->i_ino) {
retval = -EFSCORRUPTED;
udf_err(old_inode->i_sb,
"directory (ino %lu) has parent entry pointing to another inode (%lu != %u)\n",
old_inode->i_ino, old_dir->i_ino,
udf_get_lb_pblock(old_inode->i_sb, &tloc, 0));
goto out_oiter;
}
}
retval = udf_fiiter_find_entry(new_dir, &new_dentry->d_name, &niter);
if (retval && retval != -ENOENT)
goto out_oiter;
/* Entry found but not passed by VFS? */
if (!retval && !new_inode) {
retval = -EFSCORRUPTED;
udf_fiiter_release(&niter);
goto out_oiter;
}
/* Entry not found? Need to add one... */
if (retval) {
udf_fiiter_release(&niter);
retval = udf_fiiter_add_entry(new_dir, new_dentry, &niter);
if (retval)
goto out_oiter;
}
/*
* Like most other Unix systems, set the ctime for inodes on a
* rename.
*/
inode_set_ctime_current(old_inode);
mark_inode_dirty(old_inode);
/*
* ok, that's it
*/
niter.fi.fileVersionNum = oiter.fi.fileVersionNum;
niter.fi.fileCharacteristics = oiter.fi.fileCharacteristics;
memcpy(&(niter.fi.icb), &(oiter.fi.icb), sizeof(oiter.fi.icb));
udf_fiiter_write_fi(&niter, NULL);
udf_fiiter_release(&niter);
/*
* The old entry may have moved due to new entry allocation. Find it
* again.
*/
udf_fiiter_release(&oiter);
retval = udf_fiiter_find_entry(old_dir, &old_dentry->d_name, &oiter);
if (retval) {
udf_err(old_dir->i_sb,
"failed to find renamed entry again in directory (ino %lu)\n",
old_dir->i_ino);
} else {
udf_fiiter_delete_entry(&oiter);
udf_fiiter_release(&oiter);
}
if (new_inode) {
inode_set_ctime_current(new_inode);
inode_dec_link_count(new_inode);
udf_add_fid_counter(old_dir->i_sb, S_ISDIR(new_inode->i_mode),
-1);
}
inode_set_mtime_to_ts(old_dir, inode_set_ctime_current(old_dir));
inode_set_mtime_to_ts(new_dir, inode_set_ctime_current(new_dir));
mark_inode_dirty(old_dir);
mark_inode_dirty(new_dir);
if (has_diriter) {
diriter.fi.icb.extLocation =
cpu_to_lelb(UDF_I(new_dir)->i_location);
udf_fiiter_write_fi(&diriter, NULL);
udf_fiiter_release(&diriter);
}
if (is_dir) {
inode_dec_link_count(old_dir);
if (new_inode)
inode_dec_link_count(new_inode);
else {
inc_nlink(new_dir);
mark_inode_dirty(new_dir);
}
}
return 0;
out_oiter:
if (has_diriter)
udf_fiiter_release(&diriter);
udf_fiiter_release(&oiter);
return retval;
}
static struct dentry *udf_get_parent(struct dentry *child)
{
struct kernel_lb_addr tloc;
struct udf_fileident_iter iter;
int err;
err = udf_fiiter_find_entry(d_inode(child), &dotdot_name, &iter);
if (err)
return ERR_PTR(err);
tloc = lelb_to_cpu(iter.fi.icb.extLocation);
udf_fiiter_release(&iter);
return d_obtain_alias(udf_iget(child->d_sb, &tloc));
}
static struct dentry *udf_nfs_get_inode(struct super_block *sb, u32 block,
u16 partref, __u32 generation)
{
struct inode *inode;
struct kernel_lb_addr loc;
if (block == 0)
return ERR_PTR(-ESTALE);
loc.logicalBlockNum = block;
loc.partitionReferenceNum = partref;
inode = udf_iget(sb, &loc);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return d_obtain_alias(inode);
}
static struct dentry *udf_fh_to_dentry(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type)
{
if (fh_len < 3 ||
(fh_type != FILEID_UDF_WITH_PARENT &&
fh_type != FILEID_UDF_WITHOUT_PARENT))
return NULL;
return udf_nfs_get_inode(sb, fid->udf.block, fid->udf.partref,
fid->udf.generation);
}
static struct dentry *udf_fh_to_parent(struct super_block *sb,
struct fid *fid, int fh_len, int fh_type)
{
if (fh_len < 5 || fh_type != FILEID_UDF_WITH_PARENT)
return NULL;
return udf_nfs_get_inode(sb, fid->udf.parent_block,
fid->udf.parent_partref,
fid->udf.parent_generation);
}
static int udf_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
struct inode *parent)
{
int len = *lenp;
struct kernel_lb_addr location = UDF_I(inode)->i_location;
struct fid *fid = (struct fid *)fh;
int type = FILEID_UDF_WITHOUT_PARENT;
if (parent && (len < 5)) {
*lenp = 5;
return FILEID_INVALID;
} else if (len < 3) {
*lenp = 3;
return FILEID_INVALID;
}
*lenp = 3;
fid->udf.block = location.logicalBlockNum;
fid->udf.partref = location.partitionReferenceNum;
fid->udf.parent_partref = 0;
fid->udf.generation = inode->i_generation;
if (parent) {
location = UDF_I(parent)->i_location;
fid->udf.parent_block = location.logicalBlockNum;
fid->udf.parent_partref = location.partitionReferenceNum;
fid->udf.parent_generation = inode->i_generation;
*lenp = 5;
type = FILEID_UDF_WITH_PARENT;
}
return type;
}
const struct export_operations udf_export_ops = {
.encode_fh = udf_encode_fh,
.fh_to_dentry = udf_fh_to_dentry,
.fh_to_parent = udf_fh_to_parent,
.get_parent = udf_get_parent,
};
const struct inode_operations udf_dir_inode_operations = {
.lookup = udf_lookup,
.create = udf_create,
.link = udf_link,
.unlink = udf_unlink,
.symlink = udf_symlink,
.mkdir = udf_mkdir,
.rmdir = udf_rmdir,
.mknod = udf_mknod,
.rename = udf_rename,
.tmpfile = udf_tmpfile,
};
Reference in New Issue View Git Blame Copy Permalink