UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity
OpenCloudOS-Kernel/fs/udf/namei.c

1018 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_NOFS);
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);
if (IS_ERR(inode))
return ERR_CAST(inode);
}
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) {
if (!dentry->d_name.len)
return -EINVAL;
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);
dir->i_mtime = 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);
dir->i_mtime = 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);
dir->i_mtime = 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);
dir->i_mtime = 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 = udf_new_inode(dir, S_IFLNK | 0777);
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;
if (IS_ERR(inode))
return PTR_ERR(inode);
iinfo = UDF_I(inode);
down_write(&iinfo->i_data_sem);
name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
if (!name) {
err = -ENOMEM;
goto out_no_entry;
}
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);
dir->i_mtime = 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;
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;
}
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);
}
old_dir->i_mtime = inode_set_ctime_current(old_dir);
new_dir->i_mtime = 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_update_tag((char *)&diriter.fi,
udf_dir_entry_len(&diriter.fi));
udf_fiiter_write_fi(&diriter, NULL);
udf_fiiter_release(&diriter);
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 inode *inode = NULL;
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);
inode = udf_iget(child->d_sb, &tloc);
if (IS_ERR(inode))
return ERR_CAST(inode);
return d_obtain_alias(inode);
}
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