microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
WSL2-Linux-Kernel/fs/udf/namei.c

1322 строки
33 KiB
C
Исходник Ответственный История

/*
* namei.c
*
* PURPOSE
* Inode name handling routines for the OSTA-UDF(tm) filesystem.
*
* COPYRIGHT
* This file is distributed under the terms of the GNU General Public
* License (GPL). Copies of the GPL can be obtained from:
* ftp://prep.ai.mit.edu/pub/gnu/GPL
* Each contributing author retains all rights to their own work.
*
* (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/quotaops.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
static inline int udf_match(int len1, const char *name1, int len2, const char *name2)
{
if (len1 != len2)
return 0;
return !memcmp(name1, name2, len1);
}
int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
struct fileIdentDesc *sfi, struct udf_fileident_bh *fibh,
uint8_t *impuse, uint8_t *fileident)
{
uint16_t crclen = fibh->eoffset - fibh->soffset - sizeof(tag);
uint16_t crc;
uint8_t checksum = 0;
int i;
int offset;
uint16_t liu = le16_to_cpu(cfi->lengthOfImpUse);
uint8_t lfi = cfi->lengthFileIdent;
int padlen = fibh->eoffset - fibh->soffset - liu - lfi -
sizeof(struct fileIdentDesc);
int adinicb = 0;
if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
adinicb = 1;
offset = fibh->soffset + sizeof(struct fileIdentDesc);
if (impuse)
{
if (adinicb || (offset + liu < 0))
memcpy((uint8_t *)sfi->impUse, impuse, liu);
else if (offset >= 0)
memcpy(fibh->ebh->b_data + offset, impuse, liu);
else
{
memcpy((uint8_t *)sfi->impUse, impuse, -offset);
memcpy(fibh->ebh->b_data, impuse - offset, liu + offset);
}
}
offset += liu;
if (fileident)
{
if (adinicb || (offset + lfi < 0))
memcpy((uint8_t *)sfi->fileIdent + liu, fileident, lfi);
else if (offset >= 0)
memcpy(fibh->ebh->b_data + offset, fileident, lfi);
else
{
memcpy((uint8_t *)sfi->fileIdent + liu, fileident, -offset);
memcpy(fibh->ebh->b_data, fileident - offset, lfi + offset);
}
}
offset += lfi;
if (adinicb || (offset + padlen < 0))
memset((uint8_t *)sfi->padding + liu + lfi, 0x00, padlen);
else if (offset >= 0)
memset(fibh->ebh->b_data + offset, 0x00, padlen);
else
{
memset((uint8_t *)sfi->padding + liu + lfi, 0x00, -offset);
memset(fibh->ebh->b_data, 0x00, padlen + offset);
}
crc = udf_crc((uint8_t *)cfi + sizeof(tag), sizeof(struct fileIdentDesc) -
sizeof(tag), 0);
if (fibh->sbh == fibh->ebh)
crc = udf_crc((uint8_t *)sfi->impUse,
crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
else if (sizeof(struct fileIdentDesc) >= -fibh->soffset)
crc = udf_crc(fibh->ebh->b_data + sizeof(struct fileIdentDesc) + fibh->soffset,
crclen + sizeof(tag) - sizeof(struct fileIdentDesc), crc);
else
{
crc = udf_crc((uint8_t *)sfi->impUse,
-fibh->soffset - sizeof(struct fileIdentDesc), crc);
crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc);
}
cfi->descTag.descCRC = cpu_to_le16(crc);
cfi->descTag.descCRCLength = cpu_to_le16(crclen);
for (i=0; i<16; i++)
if (i != 4)
checksum += ((uint8_t *)&cfi->descTag)[i];
cfi->descTag.tagChecksum = checksum;
if (adinicb || (sizeof(struct fileIdentDesc) <= -fibh->soffset))
memcpy((uint8_t *)sfi, (uint8_t *)cfi, sizeof(struct fileIdentDesc));
else
{
memcpy((uint8_t *)sfi, (uint8_t *)cfi, -fibh->soffset);
memcpy(fibh->ebh->b_data, (uint8_t *)cfi - fibh->soffset,
sizeof(struct fileIdentDesc) + fibh->soffset);
}
if (adinicb)
mark_inode_dirty(inode);
else
{
if (fibh->sbh != fibh->ebh)
mark_buffer_dirty_inode(fibh->ebh, inode);
mark_buffer_dirty_inode(fibh->sbh, inode);
}
return 0;
}
static struct fileIdentDesc *
udf_find_entry(struct inode *dir, struct dentry *dentry,
struct udf_fileident_bh *fibh,
struct fileIdentDesc *cfi)
{
struct fileIdentDesc *fi=NULL;
loff_t f_pos;
int block, flen;
char fname[UDF_NAME_LEN];
char *nameptr;
uint8_t lfi;
uint16_t liu;
loff_t size;
kernel_lb_addr bloc, eloc;
uint32_t extoffset, elen, offset;
struct buffer_head *bh = NULL;
size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
f_pos = (udf_ext0_offset(dir) >> 2);
fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
fibh->sbh = fibh->ebh = NULL;
else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
&bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
{
offset >>= dir->i_sb->s_blocksize_bits;
block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
{
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
extoffset -= sizeof(short_ad);
else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
extoffset -= sizeof(long_ad);
}
else
offset = 0;
if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
{
udf_release_data(bh);
return NULL;
}
}
else
{
udf_release_data(bh);
return NULL;
}
while ( (f_pos < size) )
{
fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
if (!fi)
{
if (fibh->sbh != fibh->ebh)
udf_release_data(fibh->ebh);
udf_release_data(fibh->sbh);
udf_release_data(bh);
return NULL;
}
liu = le16_to_cpu(cfi->lengthOfImpUse);
lfi = cfi->lengthFileIdent;
if (fibh->sbh == fibh->ebh)
{
nameptr = fi->fileIdent + liu;
}
else
{
int poffset; /* Unpaded ending offset */
poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
if (poffset >= lfi)
nameptr = (uint8_t *)(fibh->ebh->b_data + poffset - lfi);
else
{
nameptr = fname;
memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
}
}
if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
{
if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNDELETE) )
continue;
}
if ( (cfi->fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0 )
{
if ( !UDF_QUERY_FLAG(dir->i_sb, UDF_FLAG_UNHIDE) )
continue;
}
if (!lfi)
continue;
if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)))
{
if (udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
{
udf_release_data(bh);
return fi;
}
}
}
if (fibh->sbh != fibh->ebh)
udf_release_data(fibh->ebh);
udf_release_data(fibh->sbh);
udf_release_data(bh);
return NULL;
}
/*
* udf_lookup
*
* PURPOSE
* Look-up the inode for a given name.
*
* DESCRIPTION
* Required - lookup_dentry() will return -ENOTDIR if this routine is not
* available for a directory. The filesystem is useless if this routine is
* not available for at least the filesystem's root directory.
*
* This routine is passed an incomplete dentry - it must be completed by
* calling d_add(dentry, inode). If the name does not exist, then the
* specified inode must be set to null. An error should only be returned
* when the lookup fails for a reason other than the name not existing.
* Note that the directory inode semaphore is held during the call.
*
* Refer to lookup_dentry() in fs/namei.c
* lookup_dentry() -> lookup() -> real_lookup() -> .
*
* PRE-CONDITIONS
* dir Pointer to inode of parent directory.
* dentry Pointer to dentry to complete.
* nd Pointer to lookup nameidata
*
* POST-CONDITIONS
* <return> Zero on success.
*
* HISTORY
* July 1, 1997 - Andrew E. Mileski
* Written, tested, and released.
*/
static struct dentry *
udf_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode = NULL;
struct fileIdentDesc cfi;
struct udf_fileident_bh fibh;
if (dentry->d_name.len > UDF_NAME_LEN-2)
return ERR_PTR(-ENAMETOOLONG);
lock_kernel();
#ifdef UDF_RECOVERY
/* temporary shorthand for specifying files by inode number */
if (!strncmp(dentry->d_name.name, ".B=", 3) )
{
kernel_lb_addr lb = { 0, simple_strtoul(dentry->d_name.name+3, NULL, 0) };
inode = udf_iget(dir->i_sb, lb);
if (!inode)
{
unlock_kernel();
return ERR_PTR(-EACCES);
}
}
else
#endif /* UDF_RECOVERY */
if (udf_find_entry(dir, dentry, &fibh, &cfi))
{
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
inode = udf_iget(dir->i_sb, lelb_to_cpu(cfi.icb.extLocation));
if ( !inode )
{
unlock_kernel();
return ERR_PTR(-EACCES);
}
}
unlock_kernel();
d_add(dentry, inode);
return NULL;
}
static struct fileIdentDesc *
udf_add_entry(struct inode *dir, struct dentry *dentry,
struct udf_fileident_bh *fibh,
struct fileIdentDesc *cfi, int *err)
{
struct super_block *sb;
struct fileIdentDesc *fi=NULL;
char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
int namelen;
loff_t f_pos;
int flen;
char *nameptr;
loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
int nfidlen;
uint8_t lfi;
uint16_t liu;
int block;
kernel_lb_addr bloc, eloc;
uint32_t extoffset, elen, offset;
struct buffer_head *bh = NULL;
sb = dir->i_sb;
if (dentry)
{
if (!dentry->d_name.len)
{
*err = -EINVAL;
return NULL;
}
if ( !(namelen = udf_put_filename(sb, dentry->d_name.name, name, dentry->d_name.len)))
{
*err = -ENAMETOOLONG;
return NULL;
}
}
else
namelen = 0;
nfidlen = (sizeof(struct fileIdentDesc) + namelen + 3) & ~3;
f_pos = (udf_ext0_offset(dir) >> 2);
fibh->soffset = fibh->eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
fibh->sbh = fibh->ebh = NULL;
else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
&bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
{
offset >>= dir->i_sb->s_blocksize_bits;
block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
{
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
extoffset -= sizeof(short_ad);
else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
extoffset -= sizeof(long_ad);
}
else
offset = 0;
if (!(fibh->sbh = fibh->ebh = udf_tread(dir->i_sb, block)))
{
udf_release_data(bh);
*err = -EIO;
return NULL;
}
block = UDF_I_LOCATION(dir).logicalBlockNum;
}
else
{
block = udf_get_lb_pblock(dir->i_sb, UDF_I_LOCATION(dir), 0);
fibh->sbh = fibh->ebh = NULL;
fibh->soffset = fibh->eoffset = sb->s_blocksize;
goto add;
}
while ( (f_pos < size) )
{
fi = udf_fileident_read(dir, &f_pos, fibh, cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
if (!fi)
{
if (fibh->sbh != fibh->ebh)
udf_release_data(fibh->ebh);
udf_release_data(fibh->sbh);
udf_release_data(bh);
*err = -EIO;
return NULL;
}
liu = le16_to_cpu(cfi->lengthOfImpUse);
lfi = cfi->lengthFileIdent;
if (fibh->sbh == fibh->ebh)
nameptr = fi->fileIdent + liu;
else
{
int poffset; /* Unpaded ending offset */
poffset = fibh->soffset + sizeof(struct fileIdentDesc) + liu + lfi;
if (poffset >= lfi)
nameptr = (char *)(fibh->ebh->b_data + poffset - lfi);
else
{
nameptr = fname;
memcpy(nameptr, fi->fileIdent + liu, lfi - poffset);
memcpy(nameptr + lfi - poffset, fibh->ebh->b_data, poffset);
}
}
if ( (cfi->fileCharacteristics & FID_FILE_CHAR_DELETED) != 0 )
{
if (((sizeof(struct fileIdentDesc) + liu + lfi + 3) & ~3) == nfidlen)
{
udf_release_data(bh);
cfi->descTag.tagSerialNum = cpu_to_le16(1);
cfi->fileVersionNum = cpu_to_le16(1);
cfi->fileCharacteristics = 0;
cfi->lengthFileIdent = namelen;
cfi->lengthOfImpUse = cpu_to_le16(0);
if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
return fi;
else
{
*err = -EIO;
return NULL;
}
}
}
if (!lfi || !dentry)
continue;
if ((flen = udf_get_filename(dir->i_sb, nameptr, fname, lfi)) &&
udf_match(flen, fname, dentry->d_name.len, dentry->d_name.name))
{
if (fibh->sbh != fibh->ebh)
udf_release_data(fibh->ebh);
udf_release_data(fibh->sbh);
udf_release_data(bh);
*err = -EEXIST;
return NULL;
}
}
add:
f_pos += nfidlen;
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB &&
sb->s_blocksize - fibh->eoffset < nfidlen)
{
udf_release_data(bh);
bh = NULL;
fibh->soffset -= udf_ext0_offset(dir);
fibh->eoffset -= udf_ext0_offset(dir);
f_pos -= (udf_ext0_offset(dir) >> 2);
if (fibh->sbh != fibh->ebh)
udf_release_data(fibh->ebh);
udf_release_data(fibh->sbh);
if (!(fibh->sbh = fibh->ebh = udf_expand_dir_adinicb(dir, &block, err)))
return NULL;
bloc = UDF_I_LOCATION(dir);
eloc.logicalBlockNum = block;
eloc.partitionReferenceNum = UDF_I_LOCATION(dir).partitionReferenceNum;
elen = dir->i_sb->s_blocksize;
extoffset = udf_file_entry_alloc_offset(dir);
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
extoffset += sizeof(short_ad);
else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
extoffset += sizeof(long_ad);
}
if (sb->s_blocksize - fibh->eoffset >= nfidlen)
{
fibh->soffset = fibh->eoffset;
fibh->eoffset += nfidlen;
if (fibh->sbh != fibh->ebh)
{
udf_release_data(fibh->sbh);
fibh->sbh = fibh->ebh;
}
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
{
block = UDF_I_LOCATION(dir).logicalBlockNum;
fi = (struct fileIdentDesc *)(UDF_I_DATA(dir) + fibh->soffset - udf_ext0_offset(dir) + UDF_I_LENEATTR(dir));
}
else
{
block = eloc.logicalBlockNum + ((elen - 1) >>
dir->i_sb->s_blocksize_bits);
fi = (struct fileIdentDesc *)(fibh->sbh->b_data + fibh->soffset);
}
}
else
{
fibh->soffset = fibh->eoffset - sb->s_blocksize;
fibh->eoffset += nfidlen - sb->s_blocksize;
if (fibh->sbh != fibh->ebh)
{
udf_release_data(fibh->sbh);
fibh->sbh = fibh->ebh;
}
block = eloc.logicalBlockNum + ((elen - 1) >>
dir->i_sb->s_blocksize_bits);
if (!(fibh->ebh = udf_bread(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2), 1, err)))
{
udf_release_data(bh);
udf_release_data(fibh->sbh);
return NULL;
}
if (!(fibh->soffset))
{
if (udf_next_aext(dir, &bloc, &extoffset, &eloc, &elen, &bh, 1) ==
(EXT_RECORDED_ALLOCATED >> 30))
{
block = eloc.logicalBlockNum + ((elen - 1) >>
dir->i_sb->s_blocksize_bits);
}
else
block ++;
udf_release_data(fibh->sbh);
fibh->sbh = fibh->ebh;
fi = (struct fileIdentDesc *)(fibh->sbh->b_data);
}
else
{
fi = (struct fileIdentDesc *)
(fibh->sbh->b_data + sb->s_blocksize + fibh->soffset);
}
}
memset(cfi, 0, sizeof(struct fileIdentDesc));
if (UDF_SB_UDFREV(sb) >= 0x0200)
udf_new_tag((char *)cfi, TAG_IDENT_FID, 3, 1, block, sizeof(tag));
else
udf_new_tag((char *)cfi, TAG_IDENT_FID, 2, 1, block, sizeof(tag));
cfi->fileVersionNum = cpu_to_le16(1);
cfi->lengthFileIdent = namelen;
cfi->lengthOfImpUse = cpu_to_le16(0);
if (!udf_write_fi(dir, cfi, fi, fibh, NULL, name))
{
udf_release_data(bh);
dir->i_size += nfidlen;
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
UDF_I_LENALLOC(dir) += nfidlen;
mark_inode_dirty(dir);
return fi;
}
else
{
udf_release_data(bh);
if (fibh->sbh != fibh->ebh)
udf_release_data(fibh->ebh);
udf_release_data(fibh->sbh);
*err = -EIO;
return NULL;
}
}
static int udf_delete_entry(struct inode *inode, struct fileIdentDesc *fi,
struct udf_fileident_bh *fibh, struct fileIdentDesc *cfi)
{
cfi->fileCharacteristics |= FID_FILE_CHAR_DELETED;
if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_STRICT))
memset(&(cfi->icb), 0x00, sizeof(long_ad));
return udf_write_fi(inode, cfi, fi, fibh, NULL, NULL);
}
static int udf_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
{
struct udf_fileident_bh fibh;
struct inode *inode;
struct fileIdentDesc cfi, *fi;
int err;
lock_kernel();
inode = udf_new_inode(dir, mode, &err);
if (!inode)
{
unlock_kernel();
return err;
}
if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
inode->i_data.a_ops = &udf_adinicb_aops;
else
inode->i_data.a_ops = &udf_aops;
inode->i_op = &udf_file_inode_operations;
inode->i_fop = &udf_file_operations;
inode->i_mode = mode;
mark_inode_dirty(inode);
if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
{
inode->i_nlink --;
mark_inode_dirty(inode);
iput(inode);
unlock_kernel();
return err;
}
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
{
mark_inode_dirty(dir);
}
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
unlock_kernel();
d_instantiate(dentry, inode);
return 0;
}
static int udf_mknod(struct inode * dir, struct dentry * dentry, int mode, dev_t rdev)
{
struct inode * inode;
struct udf_fileident_bh fibh;
struct fileIdentDesc cfi, *fi;
int err;
if (!old_valid_dev(rdev))
return -EINVAL;
lock_kernel();
err = -EIO;
inode = udf_new_inode(dir, mode, &err);
if (!inode)
goto out;
inode->i_uid = current->fsuid;
init_special_inode(inode, mode, rdev);
if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
{
inode->i_nlink --;
mark_inode_dirty(inode);
iput(inode);
unlock_kernel();
return err;
}
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
{
mark_inode_dirty(dir);
}
mark_inode_dirty(inode);
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
d_instantiate(dentry, inode);
err = 0;
out:
unlock_kernel();
return err;
}
static int udf_mkdir(struct inode * dir, struct dentry * dentry, int mode)
{
struct inode * inode;
struct udf_fileident_bh fibh;
struct fileIdentDesc cfi, *fi;
int err;
lock_kernel();
err = -EMLINK;
if (dir->i_nlink >= (256<<sizeof(dir->i_nlink))-1)
goto out;
err = -EIO;
inode = udf_new_inode(dir, S_IFDIR, &err);
if (!inode)
goto out;
inode->i_op = &udf_dir_inode_operations;
inode->i_fop = &udf_dir_operations;
if (!(fi = udf_add_entry(inode, NULL, &fibh, &cfi, &err)))
{
inode->i_nlink--;
mark_inode_dirty(inode);
iput(inode);
goto out;
}
inode->i_nlink = 2;
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(dir));
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
cpu_to_le32(UDF_I_UNIQUE(dir) & 0x00000000FFFFFFFFUL);
cfi.fileCharacteristics = FID_FILE_CHAR_DIRECTORY | FID_FILE_CHAR_PARENT;
udf_write_fi(inode, &cfi, fi, &fibh, NULL, NULL);
udf_release_data(fibh.sbh);
inode->i_mode = S_IFDIR | mode;
if (dir->i_mode & S_ISGID)
inode->i_mode |= S_ISGID;
mark_inode_dirty(inode);
if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
{
inode->i_nlink = 0;
mark_inode_dirty(inode);
iput(inode);
goto out;
}
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
cpu_to_le32(UDF_I_UNIQUE(inode) & 0x00000000FFFFFFFFUL);
cfi.fileCharacteristics |= FID_FILE_CHAR_DIRECTORY;
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
inc_nlink(dir);
mark_inode_dirty(dir);
d_instantiate(dentry, inode);
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
err = 0;
out:
unlock_kernel();
return err;
}
static int empty_dir(struct inode *dir)
{
struct fileIdentDesc *fi, cfi;
struct udf_fileident_bh fibh;
loff_t f_pos;
loff_t size = (udf_ext0_offset(dir) + dir->i_size) >> 2;
int block;
kernel_lb_addr bloc, eloc;
uint32_t extoffset, elen, offset;
struct buffer_head *bh = NULL;
f_pos = (udf_ext0_offset(dir) >> 2);
fibh.soffset = fibh.eoffset = (f_pos & ((dir->i_sb->s_blocksize - 1) >> 2)) << 2;
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
fibh.sbh = fibh.ebh = NULL;
else if (inode_bmap(dir, f_pos >> (dir->i_sb->s_blocksize_bits - 2),
&bloc, &extoffset, &eloc, &elen, &offset, &bh) == (EXT_RECORDED_ALLOCATED >> 30))
{
offset >>= dir->i_sb->s_blocksize_bits;
block = udf_get_lb_pblock(dir->i_sb, eloc, offset);
if ((++offset << dir->i_sb->s_blocksize_bits) < elen)
{
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_SHORT)
extoffset -= sizeof(short_ad);
else if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_LONG)
extoffset -= sizeof(long_ad);
}
else
offset = 0;
if (!(fibh.sbh = fibh.ebh = udf_tread(dir->i_sb, block)))
{
udf_release_data(bh);
return 0;
}
}
else
{
udf_release_data(bh);
return 0;
}
while ( (f_pos < size) )
{
fi = udf_fileident_read(dir, &f_pos, &fibh, &cfi, &bloc, &extoffset, &eloc, &elen, &offset, &bh);
if (!fi)
{
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
udf_release_data(bh);
return 0;
}
if (cfi.lengthFileIdent && (cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) == 0)
{
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
udf_release_data(bh);
return 0;
}
}
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
udf_release_data(bh);
return 1;
}
static int udf_rmdir(struct inode * dir, struct dentry * dentry)
{
int retval;
struct inode * inode = dentry->d_inode;
struct udf_fileident_bh fibh;
struct fileIdentDesc *fi, cfi;
kernel_lb_addr tloc;
retval = -ENOENT;
lock_kernel();
fi = udf_find_entry(dir, dentry, &fibh, &cfi);
if (!fi)
goto out;
retval = -EIO;
tloc = lelb_to_cpu(cfi.icb.extLocation);
if (udf_get_lb_pblock(dir->i_sb, tloc, 0) != inode->i_ino)
goto end_rmdir;
retval = -ENOTEMPTY;
if (!empty_dir(inode))
goto end_rmdir;
retval = udf_delete_entry(dir, fi, &fibh, &cfi);
if (retval)
goto end_rmdir;
if (inode->i_nlink != 2)
udf_warning(inode->i_sb, "udf_rmdir",
"empty directory has nlink != 2 (%d)",
inode->i_nlink);
clear_nlink(inode);
inode->i_size = 0;
inode_dec_link_count(inode);
inode->i_ctime = dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
mark_inode_dirty(dir);
end_rmdir:
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
out:
unlock_kernel();
return retval;
}
static int udf_unlink(struct inode * dir, struct dentry * dentry)
{
int retval;
struct inode * inode = dentry->d_inode;
struct udf_fileident_bh fibh;
struct fileIdentDesc *fi;
struct fileIdentDesc cfi;
kernel_lb_addr tloc;
retval = -ENOENT;
lock_kernel();
fi = udf_find_entry(dir, dentry, &fibh, &cfi);
if (!fi)
goto out;
retval = -EIO;
tloc = lelb_to_cpu(cfi.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), %d\n",
inode->i_ino, inode->i_nlink);
inode->i_nlink = 1;
}
retval = udf_delete_entry(dir, fi, &fibh, &cfi);
if (retval)
goto end_unlink;
dir->i_ctime = dir->i_mtime = current_fs_time(dir->i_sb);
mark_inode_dirty(dir);
inode_dec_link_count(inode);
inode->i_ctime = dir->i_ctime;
retval = 0;
end_unlink:
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
out:
unlock_kernel();
return retval;
}
static int udf_symlink(struct inode * dir, struct dentry * dentry, const char * symname)
{
struct inode * inode;
struct pathComponent *pc;
char *compstart;
struct udf_fileident_bh fibh;
struct buffer_head *bh = NULL;
int eoffset, elen = 0;
struct fileIdentDesc *fi;
struct fileIdentDesc cfi;
char *ea;
int err;
int block;
char name[UDF_NAME_LEN];
int namelen;
lock_kernel();
if (!(inode = udf_new_inode(dir, S_IFLNK, &err)))
goto out;
inode->i_mode = S_IFLNK | S_IRWXUGO;
inode->i_data.a_ops = &udf_symlink_aops;
inode->i_op = &page_symlink_inode_operations;
if (UDF_I_ALLOCTYPE(inode) != ICBTAG_FLAG_AD_IN_ICB)
{
struct buffer_head *bh = NULL;
kernel_lb_addr bloc, eloc;
uint32_t elen, extoffset;
block = udf_new_block(inode->i_sb, inode,
UDF_I_LOCATION(inode).partitionReferenceNum,
UDF_I_LOCATION(inode).logicalBlockNum, &err);
if (!block)
goto out_no_entry;
bloc = UDF_I_LOCATION(inode);
eloc.logicalBlockNum = block;
eloc.partitionReferenceNum = UDF_I_LOCATION(inode).partitionReferenceNum;
elen = inode->i_sb->s_blocksize;
UDF_I_LENEXTENTS(inode) = elen;
extoffset = udf_file_entry_alloc_offset(inode);
udf_add_aext(inode, &bloc, &extoffset, eloc, elen, &bh, 0);
udf_release_data(bh);
block = udf_get_pblock(inode->i_sb, block,
UDF_I_LOCATION(inode).partitionReferenceNum, 0);
bh = udf_tread(inode->i_sb, block);
lock_buffer(bh);
memset(bh->b_data, 0x00, inode->i_sb->s_blocksize);
set_buffer_uptodate(bh);
unlock_buffer(bh);
mark_buffer_dirty_inode(bh, inode);
ea = bh->b_data + udf_ext0_offset(inode);
}
else
ea = UDF_I_DATA(inode) + UDF_I_LENEATTR(inode);
eoffset = inode->i_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;
pc += sizeof(struct pathComponent);
elen += sizeof(struct pathComponent);
}
err = -ENAMETOOLONG;
while (*symname)
{
if (elen + sizeof(struct pathComponent) > eoffset)
goto out_no_entry;
pc = (struct pathComponent *)(ea + elen);
compstart = (char *)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)
{
if ( !(namelen = udf_put_filename(inode->i_sb, compstart, name, symname-compstart)))
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 == '/');
}
}
udf_release_data(bh);
inode->i_size = elen;
if (UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB)
UDF_I_LENALLOC(inode) = inode->i_size;
mark_inode_dirty(inode);
if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
goto out_no_entry;
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
if (UDF_SB_LVIDBH(inode->i_sb))
{
struct logicalVolHeaderDesc *lvhd;
uint64_t uniqueID;
lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
uniqueID = le64_to_cpu(lvhd->uniqueID);
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
if (!(++uniqueID & 0x00000000FFFFFFFFUL))
uniqueID += 16;
lvhd->uniqueID = cpu_to_le64(uniqueID);
mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
}
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
{
mark_inode_dirty(dir);
}
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
d_instantiate(dentry, inode);
err = 0;
out:
unlock_kernel();
return err;
out_no_entry:
inode_dec_link_count(inode);
iput(inode);
goto out;
}
static int udf_link(struct dentry * old_dentry, struct inode * dir,
struct dentry *dentry)
{
struct inode *inode = old_dentry->d_inode;
struct udf_fileident_bh fibh;
struct fileIdentDesc cfi, *fi;
int err;
lock_kernel();
if (inode->i_nlink >= (256<<sizeof(inode->i_nlink))-1)
{
unlock_kernel();
return -EMLINK;
}
if (!(fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err)))
{
unlock_kernel();
return err;
}
cfi.icb.extLength = cpu_to_le32(inode->i_sb->s_blocksize);
cfi.icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(inode));
if (UDF_SB_LVIDBH(inode->i_sb))
{
struct logicalVolHeaderDesc *lvhd;
uint64_t uniqueID;
lvhd = (struct logicalVolHeaderDesc *)(UDF_SB_LVID(inode->i_sb)->logicalVolContentsUse);
uniqueID = le64_to_cpu(lvhd->uniqueID);
*(__le32 *)((struct allocDescImpUse *)cfi.icb.impUse)->impUse =
cpu_to_le32(uniqueID & 0x00000000FFFFFFFFUL);
if (!(++uniqueID & 0x00000000FFFFFFFFUL))
uniqueID += 16;
lvhd->uniqueID = cpu_to_le64(uniqueID);
mark_buffer_dirty(UDF_SB_LVIDBH(inode->i_sb));
}
udf_write_fi(dir, &cfi, fi, &fibh, NULL, NULL);
if (UDF_I_ALLOCTYPE(dir) == ICBTAG_FLAG_AD_IN_ICB)
{
mark_inode_dirty(dir);
}
if (fibh.sbh != fibh.ebh)
udf_release_data(fibh.ebh);
udf_release_data(fibh.sbh);
inc_nlink(inode);
inode->i_ctime = current_fs_time(inode->i_sb);
mark_inode_dirty(inode);
atomic_inc(&inode->i_count);
d_instantiate(dentry, inode);
unlock_kernel();
return 0;
}
/* Anybody can rename anything with this: the permission checks are left to the
* higher-level routines.
*/
static int udf_rename (struct inode * old_dir, struct dentry * old_dentry,
struct inode * new_dir, struct dentry * new_dentry)
{
struct inode * old_inode = old_dentry->d_inode;
struct inode * new_inode = new_dentry->d_inode;
struct udf_fileident_bh ofibh, nfibh;
struct fileIdentDesc *ofi = NULL, *nfi = NULL, *dir_fi = NULL, ocfi, ncfi;
struct buffer_head *dir_bh = NULL;
int retval = -ENOENT;
kernel_lb_addr tloc;
lock_kernel();
if ((ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi)))
{
if (ofibh.sbh != ofibh.ebh)
udf_release_data(ofibh.ebh);
udf_release_data(ofibh.sbh);
}
tloc = lelb_to_cpu(ocfi.icb.extLocation);
if (!ofi || udf_get_lb_pblock(old_dir->i_sb, tloc, 0)
!= old_inode->i_ino)
goto end_rename;
nfi = udf_find_entry(new_dir, new_dentry, &nfibh, &ncfi);
if (nfi)
{
if (!new_inode)
{
if (nfibh.sbh != nfibh.ebh)
udf_release_data(nfibh.ebh);
udf_release_data(nfibh.sbh);
nfi = NULL;
}
}
if (S_ISDIR(old_inode->i_mode))
{
uint32_t offset = udf_ext0_offset(old_inode);
if (new_inode)
{
retval = -ENOTEMPTY;
if (!empty_dir(new_inode))
goto end_rename;
}
retval = -EIO;
if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
{
dir_fi = udf_get_fileident(UDF_I_DATA(old_inode) -
(UDF_I_EFE(old_inode) ?
sizeof(struct extendedFileEntry) :
sizeof(struct fileEntry)),
old_inode->i_sb->s_blocksize, &offset);
}
else
{
dir_bh = udf_bread(old_inode, 0, 0, &retval);
if (!dir_bh)
goto end_rename;
dir_fi = udf_get_fileident(dir_bh->b_data, old_inode->i_sb->s_blocksize, &offset);
}
if (!dir_fi)
goto end_rename;
tloc = lelb_to_cpu(dir_fi->icb.extLocation);
if (udf_get_lb_pblock(old_inode->i_sb, tloc, 0)
!= old_dir->i_ino)
goto end_rename;
retval = -EMLINK;
if (!new_inode && new_dir->i_nlink >= (256<<sizeof(new_dir->i_nlink))-1)
goto end_rename;
}
if (!nfi)
{
nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi, &retval);
if (!nfi)
goto end_rename;
}
/*
* Like most other Unix systems, set the ctime for inodes on a
* rename.
*/
old_inode->i_ctime = current_fs_time(old_inode->i_sb);
mark_inode_dirty(old_inode);
/*
* ok, that's it
*/
ncfi.fileVersionNum = ocfi.fileVersionNum;
ncfi.fileCharacteristics = ocfi.fileCharacteristics;
memcpy(&(ncfi.icb), &(ocfi.icb), sizeof(long_ad));
udf_write_fi(new_dir, &ncfi, nfi, &nfibh, NULL, NULL);
/* The old fid may have moved - find it again */
ofi = udf_find_entry(old_dir, old_dentry, &ofibh, &ocfi);
udf_delete_entry(old_dir, ofi, &ofibh, &ocfi);
if (new_inode)
{
new_inode->i_ctime = current_fs_time(new_inode->i_sb);
inode_dec_link_count(new_inode);
}
old_dir->i_ctime = old_dir->i_mtime = current_fs_time(old_dir->i_sb);
mark_inode_dirty(old_dir);
if (dir_fi)
{
dir_fi->icb.extLocation = cpu_to_lelb(UDF_I_LOCATION(new_dir));
udf_update_tag((char *)dir_fi, (sizeof(struct fileIdentDesc) +
le16_to_cpu(dir_fi->lengthOfImpUse) + 3) & ~3);
if (UDF_I_ALLOCTYPE(old_inode) == ICBTAG_FLAG_AD_IN_ICB)
{
mark_inode_dirty(old_inode);
}
else
mark_buffer_dirty_inode(dir_bh, old_inode);
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);
}
}
if (ofi)
{
if (ofibh.sbh != ofibh.ebh)
udf_release_data(ofibh.ebh);
udf_release_data(ofibh.sbh);
}
retval = 0;
end_rename:
udf_release_data(dir_bh);
if (nfi)
{
if (nfibh.sbh != nfibh.ebh)
udf_release_data(nfibh.ebh);
udf_release_data(nfibh.sbh);
}
unlock_kernel();
return retval;
}
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,
};
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку