OpenSolaris_b135/lib/libntfs/common/libntfs/dir.c
/**
* dir.c - Directory handling code. Part of the Linux-NTFS project.
*
* Copyright (c) 2002-2005 Anton Altaparmakov
* Copyright (c) 2005-2007 Yura Pakhuchiy
* Copyright (c) 2004-2005 Richard Russon
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program/include file is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (in the main directory of the Linux-NTFS
* distribution in the file COPYING); if not, write to the Free Software
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_SYS_SYSMACROS_H
#include <sys/sysmacros.h>
#endif
#include "compat.h"
#include "types.h"
#include "debug.h"
#include "attrib.h"
#include "inode.h"
#include "dir.h"
#include "volume.h"
#include "mft.h"
#include "index.h"
#include "ntfstime.h"
#include "lcnalloc.h"
#include "logging.h"
/*
* The little endian Unicode strings "$I30", "$SII", "$SDH", "$O"
* and "$Q" as global constants.
*/
ntfschar NTFS_INDEX_I30[5] = { const_cpu_to_le16('$'), const_cpu_to_le16('I'),
const_cpu_to_le16('3'), const_cpu_to_le16('0'),
const_cpu_to_le16('\0') };
ntfschar NTFS_INDEX_SII[5] = { const_cpu_to_le16('$'), const_cpu_to_le16('S'),
const_cpu_to_le16('I'), const_cpu_to_le16('I'),
const_cpu_to_le16('\0') };
ntfschar NTFS_INDEX_SDH[5] = { const_cpu_to_le16('$'), const_cpu_to_le16('S'),
const_cpu_to_le16('D'), const_cpu_to_le16('H'),
const_cpu_to_le16('\0') };
ntfschar NTFS_INDEX_O[3] = { const_cpu_to_le16('$'), const_cpu_to_le16('O'),
const_cpu_to_le16('\0') };
ntfschar NTFS_INDEX_Q[3] = { const_cpu_to_le16('$'), const_cpu_to_le16('Q'),
const_cpu_to_le16('\0') };
ntfschar NTFS_INDEX_R[3] = { const_cpu_to_le16('$'), const_cpu_to_le16('R'),
const_cpu_to_le16('\0') };
/**
* ntfs_inode_lookup_by_name - find an inode in a directory given its name
* @dir_ni: ntfs inode of the directory in which to search for the name
* @uname: Unicode name for which to search in the directory
* @uname_len: length of the name @uname in Unicode characters
*
* Look for an inode with name @uname in the directory with inode @dir_ni.
* ntfs_inode_lookup_by_name() walks the contents of the directory looking for
* the Unicode name. If the name is found in the directory, the corresponding
* inode number (>= 0) is returned as a mft reference in cpu format, i.e. it
* is a 64-bit number containing the sequence number.
*
* On error, return -1 with errno set to the error code. If the inode is is not
* found errno is ENOENT.
*
* Note, @uname_len does not include the (optional) terminating NULL character.
*
* Note, we look for a case sensitive match first but we also look for a case
* insensitive match at the same time. If we find a case insensitive match, we
* save that for the case that we don't find an exact match, where we return
* the mft reference of the case insensitive match.
*
* If the volume is mounted with the case sensitive flag set, then we only
* allow exact matches.
*/
u64 ntfs_inode_lookup_by_name(ntfs_inode *dir_ni, const ntfschar *uname,
const int uname_len)
{
VCN vcn;
u64 mref = 0;
s64 br;
ntfs_volume *vol = dir_ni->vol;
ntfs_attr_search_ctx *ctx;
INDEX_ROOT *ir;
INDEX_ENTRY *ie;
INDEX_ALLOCATION *ia;
u8 *index_end;
ntfs_attr *ia_na;
int eo, rc;
u32 index_block_size, index_vcn_size;
u8 index_vcn_size_bits;
if (!dir_ni || !dir_ni->mrec || !uname || uname_len <= 0) {
errno = EINVAL;
return -1;
}
ctx = ntfs_attr_get_search_ctx(dir_ni, NULL);
if (!ctx)
return -1;
/* Find the index root attribute in the mft record. */
if (ntfs_attr_lookup(AT_INDEX_ROOT, NTFS_INDEX_I30, 4, CASE_SENSITIVE,
0, NULL, 0, ctx)) {
ntfs_log_perror("Index root attribute missing in directory "
"inode 0x%llx", (unsigned long long)dir_ni->
mft_no);
goto put_err_out;
}
/* Get to the index root value. */
ir = (INDEX_ROOT*)((u8*)ctx->attr +
le16_to_cpu(ctx->attr->u.res.value_offset));
index_block_size = le32_to_cpu(ir->index_block_size);
if (index_block_size < NTFS_BLOCK_SIZE ||
index_block_size & (index_block_size - 1)) {
ntfs_log_debug("Index block size %u is invalid.\n",
(unsigned)index_block_size);
goto put_err_out;
}
index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length);
/* The first index entry. */
ie = (INDEX_ENTRY*)((u8*)&ir->index +
le32_to_cpu(ir->index.entries_offset));
/*
* Loop until we exceed valid memory (corruption case) or until we
* reach the last entry.
*/
for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) {
/* Bounds checks. */
if ((u8*)ie < (u8*)ctx->mrec || (u8*)ie +
sizeof(INDEX_ENTRY_HEADER) > index_end ||
(u8*)ie + le16_to_cpu(ie->key_length) >
index_end)
goto put_err_out;
/*
* The last entry cannot contain a name. It can however contain
* a pointer to a child node in the B+tree so we just break out.
*/
if (ie->flags & INDEX_ENTRY_END)
break;
/*
* We perform a case sensitive comparison and if that matches
* we are done and return the mft reference of the inode (i.e.
* the inode number together with the sequence number for
* consistency checking). We convert it to cpu format before
* returning.
*/
if (ntfs_names_are_equal(uname, uname_len,
(ntfschar*)&ie->key.file_name.file_name,
ie->key.file_name.file_name_length,
CASE_SENSITIVE, vol->upcase, vol->upcase_len)) {
found_it:
/*
* We have a perfect match, so we don't need to care
* about having matched imperfectly before.
*/
mref = le64_to_cpu(ie->u.indexed_file);
ntfs_attr_put_search_ctx(ctx);
return mref;
}
/*
* For a case insensitive mount, we also perform a case
* insensitive comparison. If the comparison matches, we cache
* the mft reference in mref. Use first case insensitive match
* in case if no name matches case sensitive, but several names
* matches case insensitive.
*/
if (!mref && !NVolCaseSensitive(vol) &&
ntfs_names_are_equal(uname, uname_len,
(ntfschar*)&ie->key.file_name.file_name,
ie->key.file_name.file_name_length,
IGNORE_CASE, vol->upcase, vol->upcase_len))
mref = le64_to_cpu(ie->u.indexed_file);
/*
* Not a perfect match, need to do full blown collation so we
* know which way in the B+tree we have to go.
*/
rc = ntfs_names_collate(uname, uname_len,
(ntfschar*)&ie->key.file_name.file_name,
ie->key.file_name.file_name_length, 1,
IGNORE_CASE, vol->upcase, vol->upcase_len);
/*
* If uname collates before the name of the current entry, there
* is definitely no such name in this index but we might need to
* descend into the B+tree so we just break out of the loop.
*/
if (rc == -1)
break;
/* The names are not equal, continue the search. */
if (rc)
continue;
/*
* Names match with case insensitive comparison, now try the
* case sensitive comparison, which is required for proper
* collation.
*/
rc = ntfs_names_collate(uname, uname_len,
(ntfschar*)&ie->key.file_name.file_name,
ie->key.file_name.file_name_length, 1,
CASE_SENSITIVE, vol->upcase, vol->upcase_len);
if (rc == -1)
break;
if (rc)
continue;
/*
* Perfect match, this will never happen as the
* ntfs_are_names_equal() call will have gotten a match but we
* still treat it correctly.
*/
goto found_it;
}
/*
* We have finished with this index without success. Check for the
* presence of a child node and if not present return error code
* ENOENT, unless we have got the mft reference of a matching name
* cached in mref in which case return mref.
*/
if (!(ie->flags & INDEX_ENTRY_NODE)) {
ntfs_attr_put_search_ctx(ctx);
if (mref)
return mref;
ntfs_log_debug("Entry not found.\n");
errno = ENOENT;
return -1;
} /* Child node present, descend into it. */
/* Open the index allocation attribute. */
ia_na = ntfs_attr_open(dir_ni, AT_INDEX_ALLOCATION, NTFS_INDEX_I30, 4);
if (!ia_na) {
ntfs_log_perror("Failed to open index allocation attribute. "
"Directory inode 0x%llx is corrupt or driver "
"bug", (unsigned long long)dir_ni->mft_no);
goto put_err_out;
}
/* Allocate a buffer for the current index block. */
ia = (INDEX_ALLOCATION*)malloc(index_block_size);
if (!ia) {
ntfs_log_perror("Failed to allocate buffer for index block");
ntfs_attr_close(ia_na);
goto put_err_out;
}
/* Determine the size of a vcn in the directory index. */
if (vol->cluster_size <= index_block_size) {
index_vcn_size = vol->cluster_size;
index_vcn_size_bits = vol->cluster_size_bits;
} else {
index_vcn_size = vol->sector_size;
index_vcn_size_bits = vol->sector_size_bits;
}
/* Get the starting vcn of the index_block holding the child node. */
vcn = sle64_to_cpup((u8*)ie + le16_to_cpu(ie->length) - 8);
descend_into_child_node:
/* Read the index block starting at vcn. */
br = ntfs_attr_mst_pread(ia_na, vcn << index_vcn_size_bits, 1,
index_block_size, ia);
if (br != 1) {
if (br != -1)
errno = EIO;
ntfs_log_perror("Failed to read vcn 0x%llx",
(unsigned long long)vcn);
goto close_err_out;
}
if (sle64_to_cpu(ia->index_block_vcn) != vcn) {
ntfs_log_debug("Actual VCN (0x%llx) of index buffer is "
"different from expected VCN (0x%llx).\n",
(long long)sle64_to_cpu(ia->index_block_vcn),
(long long)vcn);
errno = EIO;
goto close_err_out;
}
if (le32_to_cpu(ia->index.allocated_size) + 0x18 != index_block_size) {
ntfs_log_debug("Index buffer (VCN 0x%llx) of directory inode "
"0x%llx has a size (%u) differing from the "
"directory specified size (%u).\n",
(long long)vcn, (unsigned long long)dir_ni->
mft_no, (unsigned)le32_to_cpu(ia->index.
allocated_size) + 0x18, (unsigned)
index_block_size);
errno = EIO;
goto close_err_out;
}
index_end = (u8*)&ia->index + le32_to_cpu(ia->index.index_length);
if (index_end > (u8*)ia + index_block_size) {
ntfs_log_debug("Size of index buffer (VCN 0x%llx) of directory "
"inode 0x%llx exceeds maximum size.\n",
(long long)vcn, (unsigned long long)dir_ni->
mft_no);
errno = EIO;
goto close_err_out;
}
/* The first index entry. */
ie = (INDEX_ENTRY*)((u8*)&ia->index +
le32_to_cpu(ia->index.entries_offset));
/*
* Iterate similar to above big loop but applied to index buffer, thus
* loop until we exceed valid memory (corruption case) or until we
* reach the last entry.
*/
for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) {
/* Bounds check. */
if ((u8*)ie < (u8*)ia || (u8*)ie +
sizeof(INDEX_ENTRY_HEADER) > index_end ||
(u8*)ie + le16_to_cpu(ie->key_length) >
index_end) {
ntfs_log_debug("Index entry out of bounds in directory "
"inode 0x%llx.\n",
(unsigned long long)dir_ni->mft_no);
errno = EIO;
goto close_err_out;
}
/*
* The last entry cannot contain a name. It can however contain
* a pointer to a child node in the B+tree so we just break out.
*/
if (ie->flags & INDEX_ENTRY_END)
break;
/*
* We perform a case sensitive comparison and if that matches
* we are done and return the mft reference of the inode (i.e.
* the inode number together with the sequence number for
* consistency checking). We convert it to cpu format before
* returning.
*/
if (ntfs_names_are_equal(uname, uname_len,
(ntfschar*)&ie->key.file_name.file_name,
ie->key.file_name.file_name_length,
CASE_SENSITIVE, vol->upcase, vol->upcase_len)) {
found_it2:
/*
* We have a perfect match, so we don't need to care
* about having matched imperfectly before.
*/
mref = le64_to_cpu(ie->u.indexed_file);
free(ia);
ntfs_attr_close(ia_na);
ntfs_attr_put_search_ctx(ctx);
return mref;
}
/*
* For a case insensitive mount, we also perform a case
* insensitive comparison. If the comparison matches, we cache
* the mft reference in mref. Use first case insensitive match
* in case if no name matches case sensitive, but several names
* matches case insensitive.
*/
if (!mref && !NVolCaseSensitive(vol) &&
ntfs_names_are_equal(uname, uname_len,
(ntfschar*)&ie->key.file_name.file_name,
ie->key.file_name.file_name_length,
IGNORE_CASE, vol->upcase, vol->upcase_len))
mref = le64_to_cpu(ie->u.indexed_file);
/*
* Not a perfect match, need to do full blown collation so we
* know which way in the B+tree we have to go.
*/
rc = ntfs_names_collate(uname, uname_len,
(ntfschar*)&ie->key.file_name.file_name,
ie->key.file_name.file_name_length, 1,
IGNORE_CASE, vol->upcase, vol->upcase_len);
/*
* If uname collates before the name of the current entry, there
* is definitely no such name in this index but we might need to
* descend into the B+tree so we just break out of the loop.
*/
if (rc == -1)
break;
/* The names are not equal, continue the search. */
if (rc)
continue;
/*
* Names match with case insensitive comparison, now try the
* case sensitive comparison, which is required for proper
* collation.
*/
rc = ntfs_names_collate(uname, uname_len,
(ntfschar*)&ie->key.file_name.file_name,
ie->key.file_name.file_name_length, 1,
CASE_SENSITIVE, vol->upcase, vol->upcase_len);
if (rc == -1)
break;
if (rc)
continue;
/*
* Perfect match, this will never happen as the
* ntfs_are_names_equal() call will have gotten a match but we
* still treat it correctly.
*/
goto found_it2;
}
/*
* We have finished with this index buffer without success. Check for
* the presence of a child node.
*/
if (ie->flags & INDEX_ENTRY_NODE) {
if ((ia->index.flags & NODE_MASK) == LEAF_NODE) {
ntfs_log_debug("Index entry with child node found in a "
"leaf node in directory inode "
"0x%llx.\n",
(unsigned long long)dir_ni->mft_no);
errno = EIO;
goto close_err_out;
}
/* Child node present, descend into it. */
vcn = sle64_to_cpup((u8*)ie + le16_to_cpu(ie->length) - 8);
if (vcn >= 0)
goto descend_into_child_node;
ntfs_log_debug("Negative child node vcn in directory inode "
"0x%llx.\n", (unsigned long long)dir_ni->
mft_no);
errno = EIO;
goto close_err_out;
}
free(ia);
ntfs_attr_close(ia_na);
ntfs_attr_put_search_ctx(ctx);
/*
* No child node present, return error code ENOENT, unless we have got
* the mft reference of a matching name cached in mref in which case
* return mref.
*/
if (mref)
return mref;
ntfs_log_debug("Entry not found.\n");
errno = ENOENT;
return -1;
put_err_out:
eo = EIO;
ntfs_log_debug("Corrupt directory. Aborting lookup.\n");
eo_put_err_out:
ntfs_attr_put_search_ctx(ctx);
errno = eo;
return -1;
close_err_out:
eo = errno;
free(ia);
ntfs_attr_close(ia_na);
goto eo_put_err_out;
}
/**
* ntfs_pathname_to_inode_num - find the inode number which represents the
* given pathname
* @vol: An ntfs volume obtained from ntfs_mount
* @parent: A directory inode to begin the search (may be NULL)
* @pathname: Pathname to be located
*
* Take an ASCII pathname and find the inode that represents it. The function
* splits the path and then descends the directory tree. If @parent is NULL,
* then the root directory '.' will be used as the base for the search.
*
* Return: -1 Error, the pathname was invalid, or some other error occurred
* else Success, the pathname was valid
*/
u64 ntfs_pathname_to_inode_num(ntfs_volume *vol, ntfs_inode *parent,
const char *pathname)
{
u64 inum, result;
int len, err = 0;
char *p, *q;
ntfs_inode *ni = NULL;
ntfschar *unicode = NULL;
char *ascii = NULL;
inum = result = (u64)-1;
if (!vol || !pathname) {
err = EINVAL;
goto close;
}
ntfs_log_trace("Path: '%s'\n", pathname);
if (parent) {
ni = parent;
} else
inum = FILE_root;
unicode = calloc(1, MAX_PATH);
ascii = strdup(pathname);
if (!unicode || !ascii) {
ntfs_log_error("Out of memory.\n");
err = ENOMEM;
goto close;
}
p = ascii;
/* Remove leading /'s. */
while (p && *p == PATH_SEP)
p++;
while (p && *p) {
if (!ni) {
ni = ntfs_inode_open(vol, inum);
if (!ni) {
ntfs_log_debug("Cannot open inode %llu.\n",
(unsigned long long)inum);
err = EIO;
goto close;
}
}
/* Find the end of the first token. */
q = strchr(p, PATH_SEP);
if (q != NULL) {
*q = 0;
q++;
}
len = ntfs_mbstoucs(p, &unicode, MAX_PATH);
if (len < 0) {
ntfs_log_debug("Couldn't convert name to Unicode: "
"%s.\n", p);
err = EILSEQ;
goto close;
}
inum = ntfs_inode_lookup_by_name(ni, unicode, len);
if (inum == (u64)-1) {
ntfs_log_debug("Couldn't find name '%s' in pathname "
"'%s'.\n", p, pathname);
err = ENOENT;
goto close;
}
inum = MREF(inum);
if (ni != parent)
ntfs_inode_close(ni);
ni = NULL;
p = q;
while (p && *p == PATH_SEP)
p++;
}
result = inum;
close:
if (ni && (ni != parent))
ntfs_inode_close(ni);
free(ascii);
free(unicode);
if (err)
errno = err;
return result;
}
/**
* ntfs_pathname_to_inode - Find the inode which represents the given pathname
* @vol: An ntfs volume obtained from ntfs_mount
* @parent: A directory inode to begin the search (may be NULL)
* @pathname: Pathname to be located
*
* Take an ASCII pathname and find the inode that represents it. The function
* splits the path and then descends the directory tree. If @parent is NULL,
* then the root directory '.' will be used as the base for the search.
*
* Return: inode Success, the pathname was valid
* NULL Error, the pathname was invalid, or some other error occurred
*/
ntfs_inode *ntfs_pathname_to_inode(ntfs_volume *vol, ntfs_inode *parent,
const char *pathname)
{
u64 inum;
inum = ntfs_pathname_to_inode_num(vol, parent, pathname);
if (inum == (u64)-1)
return NULL;
return ntfs_inode_open(vol, inum);
}
/*
* The little endian Unicode string ".." for ntfs_readdir().
*/
static const ntfschar dotdot[3] = { const_cpu_to_le16('.'),
const_cpu_to_le16('.'),
const_cpu_to_le16('\0') };
/**
* ntfs_filldir - ntfs specific filldir method
* @vol: ntfs volume with wjich we are working
* @pos: current position in directory
* @ie: current index entry
* @dirent: context for filldir callback supplied by the caller
* @filldir: filldir callback supplied by the caller
*
* Pass information specifying the current directory entry @ie to the @filldir
* callback.
*/
static int ntfs_filldir(ntfs_volume *vol, s64 *pos, INDEX_ENTRY *ie,
void *dirent, ntfs_filldir_t filldir)
{
FILE_NAME_ATTR *fn = &ie->key.file_name;
unsigned dt_type;
ntfs_log_trace("Entering.\n");
/* Skip root directory self reference entry. */
if (MREF_LE(ie->u.indexed_file) == FILE_root)
return 0;
if (ie->key.file_name.file_attributes & FILE_ATTR_I30_INDEX_PRESENT)
dt_type = NTFS_DT_DIR;
else {
if (NVolInterix(vol) && fn->file_attributes & FILE_ATTR_SYSTEM)
dt_type = NTFS_DT_UNKNOWN;
else
dt_type = NTFS_DT_REG;
}
return filldir(dirent, fn->file_name, fn->file_name_length,
fn->file_name_type, *pos,
le64_to_cpu(ie->u.indexed_file), dt_type);
}
/**
* ntfs_mft_get_parent_ref - find mft reference of parent directory of an inode
* @ni: ntfs inode whose parent directory to find
*
* Find the parent directory of the ntfs inode @ni. To do this, find the first
* file name attribute in the mft record of @ni and return the parent mft
* reference from that.
*
* Note this only makes sense for directories, since files can be hard linked
* from multiple directories and there is no way for us to tell which one is
* being looked for.
*
* Technically directories can have hard links, too, but we consider that as
* illegal as Linux/UNIX do not support directory hard links.
*
* Return the mft reference of the parent directory on success or -1 on error
* with errno set to the error code.
*/
static MFT_REF ntfs_mft_get_parent_ref(ntfs_inode *ni)
{
MFT_REF mref;
ntfs_attr_search_ctx *ctx;
FILE_NAME_ATTR *fn;
int eo;
ntfs_log_trace("Entering.\n");
if (!ni) {
errno = EINVAL;
return ERR_MREF(-1);
}
ctx = ntfs_attr_get_search_ctx(ni, NULL);
if (!ctx)
return ERR_MREF(-1);
if (ntfs_attr_lookup(AT_FILE_NAME, AT_UNNAMED, 0, 0, 0, NULL, 0, ctx)) {
ntfs_log_debug("No file name found in inode 0x%llx. Corrupt "
"inode.\n", (unsigned long long)ni->mft_no);
goto err_out;
}
if (ctx->attr->non_resident) {
ntfs_log_debug("File name attribute must be resident. "
"Corrupt inode 0x%llx.\n",
(unsigned long long)ni->mft_no);
goto io_err_out;
}
fn = (FILE_NAME_ATTR*)((u8*)ctx->attr +
le16_to_cpu(ctx->attr->u.res.value_offset));
if ((u8*)fn + le32_to_cpu(ctx->attr->u.res.value_length) >
(u8*)ctx->attr + le32_to_cpu(ctx->attr->length)) {
ntfs_log_debug("Corrupt file name attribute in inode 0x%llx.\n",
(unsigned long long)ni->mft_no);
goto io_err_out;
}
mref = le64_to_cpu(fn->parent_directory);
ntfs_attr_put_search_ctx(ctx);
return mref;
io_err_out:
errno = EIO;
err_out:
eo = errno;
ntfs_attr_put_search_ctx(ctx);
errno = eo;
return ERR_MREF(-1);
}
/**
* ntfs_readdir - read the contents of an ntfs directory
* @dir_ni: ntfs inode of current directory
* @pos: current position in directory
* @dirent: context for filldir callback supplied by the caller
* @filldir: filldir callback supplied by the caller
*
* Parse the index root and the index blocks that are marked in use in the
* index bitmap and hand each found directory entry to the @filldir callback
* supplied by the caller.
*
* Return 0 on success or -1 on error with errno set to the error code.
*
* Note: Index blocks are parsed in ascending vcn order, from which follows
* that the directory entries are not returned sorted.
*/
int ntfs_readdir(ntfs_inode *dir_ni, s64 *pos,
void *dirent, ntfs_filldir_t filldir)
{
s64 i_size, br, ia_pos, bmp_pos, ia_start;
ntfs_volume *vol;
ntfs_attr *ia_na, *bmp_na = NULL;
ntfs_attr_search_ctx *ctx = NULL;
u8 *index_end, *bmp = NULL;
INDEX_ROOT *ir;
INDEX_ENTRY *ie;
INDEX_ALLOCATION *ia = NULL;
int rc, ir_pos, bmp_buf_size, bmp_buf_pos, eo;
u32 index_block_size, index_vcn_size;
u8 index_block_size_bits, index_vcn_size_bits;
ntfs_log_trace("Entering.\n");
if (!dir_ni || !pos || !filldir) {
errno = EINVAL;
return -1;
}
if (!(dir_ni->mrec->flags & MFT_RECORD_IS_DIRECTORY)) {
errno = ENOTDIR;
return -1;
}
vol = dir_ni->vol;
ntfs_log_trace("Entering for inode 0x%llx, *pos 0x%llx.\n",
(unsigned long long)dir_ni->mft_no, (long long)*pos);
/* Open the index allocation attribute. */
ia_na = ntfs_attr_open(dir_ni, AT_INDEX_ALLOCATION, NTFS_INDEX_I30, 4);
if (!ia_na) {
if (errno != ENOENT) {
ntfs_log_perror("Failed to open index allocation "
"attribute. Directory inode 0x%llx is "
"corrupt or bug", (unsigned long long)
dir_ni->mft_no);
return -1;
}
i_size = 0;
} else
i_size = ia_na->data_size;
rc = 0;
/* Are we at end of dir yet? */
if (*pos >= i_size + vol->mft_record_size)
goto done;
/* Emulate . and .. for all directories. */
if (!*pos) {
rc = filldir(dirent, dotdot, 1, FILE_NAME_POSIX, *pos,
MK_MREF(dir_ni->mft_no,
le16_to_cpu(dir_ni->mrec->sequence_number)),
NTFS_DT_DIR);
if (rc)
goto err_out;
++*pos;
}
if (*pos == 1) {
MFT_REF parent_mref;
parent_mref = ntfs_mft_get_parent_ref(dir_ni);
if (parent_mref == ERR_MREF(-1)) {
ntfs_log_perror("Parent directory not found");
goto dir_err_out;
}
rc = filldir(dirent, dotdot, 2, FILE_NAME_POSIX, *pos,
parent_mref, NTFS_DT_DIR);
if (rc)
goto err_out;
++*pos;
}
ctx = ntfs_attr_get_search_ctx(dir_ni, NULL);
if (!ctx)
goto err_out;
/* Get the offset into the index root attribute. */
ir_pos = (int)*pos;
/* Find the index root attribute in the mft record. */
if (ntfs_attr_lookup(AT_INDEX_ROOT, NTFS_INDEX_I30, 4, CASE_SENSITIVE,
0, NULL, 0, ctx)) {
ntfs_log_debug("Index root attribute missing in directory "
"inode 0x%llx.\n", (unsigned long long)dir_ni->
mft_no);
goto dir_err_out;
}
/* Get to the index root value. */
ir = (INDEX_ROOT*)((u8*)ctx->attr +
le16_to_cpu(ctx->attr->u.res.value_offset));
/* Determine the size of a vcn in the directory index. */
index_block_size = le32_to_cpu(ir->index_block_size);
if (index_block_size < NTFS_BLOCK_SIZE ||
index_block_size & (index_block_size - 1)) {
ntfs_log_debug("Index block size %u is invalid.\n",
(unsigned)index_block_size);
goto dir_err_out;
}
index_block_size_bits = ffs(index_block_size) - 1;
if (vol->cluster_size <= index_block_size) {
index_vcn_size = vol->cluster_size;
index_vcn_size_bits = vol->cluster_size_bits;
} else {
index_vcn_size = vol->sector_size;
index_vcn_size_bits = vol->sector_size_bits;
}
/* Are we jumping straight into the index allocation attribute? */
if (*pos >= vol->mft_record_size) {
ntfs_attr_put_search_ctx(ctx);
ctx = NULL;
goto skip_index_root;
}
index_end = (u8*)&ir->index + le32_to_cpu(ir->index.index_length);
/* The first index entry. */
ie = (INDEX_ENTRY*)((u8*)&ir->index +
le32_to_cpu(ir->index.entries_offset));
/*
* Loop until we exceed valid memory (corruption case) or until we
* reach the last entry or until filldir tells us it has had enough
* or signals an error (both covered by the rc test).
*/
for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) {
ntfs_log_debug("In index root, offset 0x%x.\n",
(u8*)ie - (u8*)ir);
/* Bounds checks. */
if ((u8*)ie < (u8*)ctx->mrec || (u8*)ie +
sizeof(INDEX_ENTRY_HEADER) > index_end ||
(u8*)ie + le16_to_cpu(ie->key_length) >
index_end)
goto dir_err_out;
/* The last entry cannot contain a name. */
if (ie->flags & INDEX_ENTRY_END)
break;
/* Skip index root entry if continuing previous readdir. */
if (ir_pos > (u8*)ie - (u8*)ir)
continue;
/* Advance the position even if going to skip the entry. */
*pos = (u8*)ie - (u8*)ir;
/*
* Submit the directory entry to ntfs_filldir(), which will
* invoke the filldir() callback as appropriate.
*/
rc = ntfs_filldir(vol, pos, ie, dirent, filldir);
if (rc)
goto err_out;
}
ntfs_attr_put_search_ctx(ctx);
ctx = NULL;
/* If there is no index allocation attribute we are finished. */
if (!ia_na)
goto EOD;
/* Advance *pos to the beginning of the index allocation. */
*pos = vol->mft_record_size;
skip_index_root:
if (!ia_na)
goto done;
/* Allocate a buffer for the current index block. */
ia = (INDEX_ALLOCATION*)malloc(index_block_size);
if (!ia) {
ntfs_log_perror("Failed to allocate buffer for index block");
goto err_out;
}
bmp_na = ntfs_attr_open(dir_ni, AT_BITMAP, NTFS_INDEX_I30, 4);
if (!bmp_na) {
ntfs_log_perror("Failed to open index bitmap attribute");
goto dir_err_out;
}
/* Get the offset into the index allocation attribute. */
ia_pos = *pos - vol->mft_record_size;
bmp_pos = ia_pos >> index_block_size_bits;
if (bmp_pos >> 3 >= bmp_na->data_size) {
ntfs_log_debug("Current index position exceeds index bitmap "
"size.\n");
goto dir_err_out;
}
bmp_buf_size = min(bmp_na->data_size - (bmp_pos >> 3), 4096);
bmp = (u8*)malloc(bmp_buf_size);
if (!bmp) {
ntfs_log_perror("Failed to allocate bitmap buffer");
goto err_out;
}
br = ntfs_attr_pread(bmp_na, bmp_pos >> 3, bmp_buf_size, bmp);
if (br != bmp_buf_size) {
if (br != -1)
errno = EIO;
ntfs_log_perror("Failed to read from index bitmap attribute");
goto err_out;
}
bmp_buf_pos = 0;
/* If the index block is not in use find the next one that is. */
while (!(bmp[bmp_buf_pos >> 3] & (1 << (bmp_buf_pos & 7)))) {
find_next_index_buffer:
bmp_pos++;
bmp_buf_pos++;
/* If we have reached the end of the bitmap, we are done. */
if (bmp_pos >> 3 >= bmp_na->data_size)
goto EOD;
ia_pos = bmp_pos << index_block_size_bits;
if (bmp_buf_pos >> 3 < bmp_buf_size)
continue;
/* Read next chunk from the index bitmap. */
if ((bmp_pos >> 3) + bmp_buf_size > bmp_na->data_size)
bmp_buf_size = bmp_na->data_size - (bmp_pos >> 3);
br = ntfs_attr_pread(bmp_na, bmp_pos >> 3, bmp_buf_size, bmp);
if (br != bmp_buf_size) {
if (br != -1)
errno = EIO;
ntfs_log_perror("Failed to read from index bitmap "
"attribute");
goto err_out;
}
}
ntfs_log_debug("Handling index block 0x%llx.\n", (long long)bmp_pos);
/* Read the index block starting at bmp_pos. */
br = ntfs_attr_mst_pread(ia_na, bmp_pos << index_block_size_bits, 1,
index_block_size, ia);
if (br != 1) {
if (br != -1)
errno = EIO;
ntfs_log_perror("Failed to read index block");
goto err_out;
}
ia_start = ia_pos & ~(s64)(index_block_size - 1);
if (sle64_to_cpu(ia->index_block_vcn) != ia_start >>
index_vcn_size_bits) {
ntfs_log_debug("Actual VCN (0x%llx) of index buffer is "
"different from expected VCN (0x%llx) in "
"inode 0x%llx.\n",
(long long)sle64_to_cpu(ia->index_block_vcn),
(long long)ia_start >> index_vcn_size_bits,
(unsigned long long)dir_ni->mft_no);
goto dir_err_out;
}
if (le32_to_cpu(ia->index.allocated_size) + 0x18 != index_block_size) {
ntfs_log_debug("Index buffer (VCN 0x%llx) of directory inode "
"0x%llx has a size (%u) differing from the "
"directory specified size (%u).\n",
(long long)ia_start >> index_vcn_size_bits,
(unsigned long long)dir_ni->mft_no,
(unsigned) le32_to_cpu(ia->index.allocated_size)
+ 0x18, (unsigned)index_block_size);
goto dir_err_out;
}
index_end = (u8*)&ia->index + le32_to_cpu(ia->index.index_length);
if (index_end > (u8*)ia + index_block_size) {
ntfs_log_debug("Size of index buffer (VCN 0x%llx) of directory "
"inode 0x%llx exceeds maximum size.\n",
(long long)ia_start >> index_vcn_size_bits,
(unsigned long long)dir_ni->mft_no);
goto dir_err_out;
}
/* The first index entry. */
ie = (INDEX_ENTRY*)((u8*)&ia->index +
le32_to_cpu(ia->index.entries_offset));
/*
* Loop until we exceed valid memory (corruption case) or until we
* reach the last entry or until ntfs_filldir tells us it has had
* enough or signals an error (both covered by the rc test).
*/
for (;; ie = (INDEX_ENTRY*)((u8*)ie + le16_to_cpu(ie->length))) {
ntfs_log_debug("In index allocation, offset 0x%llx.\n",
(long long)ia_start + ((u8*)ie - (u8*)ia));
/* Bounds checks. */
if ((u8*)ie < (u8*)ia || (u8*)ie +
sizeof(INDEX_ENTRY_HEADER) > index_end ||
(u8*)ie + le16_to_cpu(ie->key_length) >
index_end) {
ntfs_log_debug("Index entry out of bounds in directory "
"inode 0x%llx.\n", (unsigned long long)
dir_ni->mft_no);
goto dir_err_out;
}
/* The last entry cannot contain a name. */
if (ie->flags & INDEX_ENTRY_END)
break;
/* Skip index entry if continuing previous readdir. */
if (ia_pos - ia_start > (u8*)ie - (u8*)ia)
continue;
/* Advance the position even if going to skip the entry. */
*pos = (u8*)ie - (u8*)ia + (sle64_to_cpu(
ia->index_block_vcn) << index_vcn_size_bits) +
dir_ni->vol->mft_record_size;
/*
* Submit the directory entry to ntfs_filldir(), which will
* invoke the filldir() callback as appropriate.
*/
rc = ntfs_filldir(vol, pos, ie, dirent, filldir);
if (rc)
goto err_out;
}
goto find_next_index_buffer;
EOD:
/* We are finished, set *pos to EOD. */
*pos = i_size + vol->mft_record_size;
done:
free(ia);
free(bmp);
if (bmp_na)
ntfs_attr_close(bmp_na);
if (ia_na)
ntfs_attr_close(ia_na);
ntfs_log_debug("EOD, *pos 0x%llx, returning 0.\n", (long long)*pos);
return 0;
dir_err_out:
errno = EIO;
err_out:
eo = errno;
if (rc)
ntfs_log_trace("filldir returned %i, *pos 0x%llx.", rc,
(long long)*pos);
ntfs_log_trace("Failed.\n");
if (ctx)
ntfs_attr_put_search_ctx(ctx);
free(ia);
free(bmp);
if (bmp_na)
ntfs_attr_close(bmp_na);
if (ia_na)
ntfs_attr_close(ia_na);
errno = eo;
return -1;
}
/**
* __ntfs_create - create object on ntfs volume
* @dir_ni: ntfs inode for directory in which create new object
* @name: unicode name of new object
* @name_len: length of the name in unicode characters
* @type: type of the object to create
* @dev: major and minor device numbers (obtained from makedev())
* @target: target in unicode (only for symlinks)
* @target_len: length of target in unicode characters
*
* Internal, use ntfs_create{,_device,_symlink} wrappers instead.
*
* @type can be:
* S_IFREG to create regular file
* S_IFDIR to create directory
* S_IFBLK to create block device
* S_IFCHR to create character device
* S_IFLNK to create symbolic link
* S_IFIFO to create FIFO
* S_IFSOCK to create socket
* other values are invalid.
*
* @dev is used only if @type is S_IFBLK or S_IFCHR, in other cases its value
* ignored.
*
* @target and @target_len are used only if @type is S_IFLNK, in other cases
* their value ignored.
*
* Return opened ntfs inode that describes created object on success or NULL
* on error with errno set to the error code.
*/
static ntfs_inode *__ntfs_create(ntfs_inode *dir_ni,
ntfschar *name, u8 name_len, dev_t type, dev_t dev,
ntfschar *target, u8 target_len)
{
ntfs_inode *ni;
int rollback_data = 0, rollback_sd = 0;
FILE_NAME_ATTR *fn = NULL;
STANDARD_INFORMATION *si = NULL;
SECURITY_DESCRIPTOR_ATTR *sd = NULL;
ACL *acl;
ACCESS_ALLOWED_ACE *ace;
SID *sid;
int err, fn_len, si_len, sd_len;
ntfs_log_trace("Entering.\n");
/* Sanity checks. */
if (!dir_ni || !name || !name_len) {
ntfs_log_error("Invalid arguments.\n");
errno = EINVAL;
return NULL;
}
/* FIXME: Reparse points requires special handling. */
if (dir_ni->flags & FILE_ATTR_REPARSE_POINT) {
errno = EOPNOTSUPP;
return NULL;
}
/* Allocate MFT record for new file. */
ni = ntfs_mft_record_alloc(dir_ni->vol, NULL);
if (!ni) {
ntfs_log_error("Failed to allocate new MFT record: %s.\n",
strerror(errno));
return NULL;
}
/*
* Create STANDARD_INFORMATION attribute. Write STANDARD_INFORMATION
* version 1.2, windows will upgrade it to version 3 if needed.
*/
si_len = offsetof(STANDARD_INFORMATION, u.v12.v1_end);
si = calloc(1, si_len);
if (!si) {
err = errno;
ntfs_log_error("Not enough memory.\n");
goto err_out;
}
si->creation_time = utc2ntfs(ni->creation_time);
si->last_data_change_time = utc2ntfs(ni->last_data_change_time);
si->last_mft_change_time = utc2ntfs(ni->last_mft_change_time);
si->last_access_time = utc2ntfs(ni->last_access_time);
if (!S_ISREG(type) && !S_ISDIR(type)) {
si->file_attributes = FILE_ATTR_SYSTEM;
ni->flags = FILE_ATTR_SYSTEM;
}
/* Add STANDARD_INFORMATION to inode. */
if (ntfs_attr_add(ni, AT_STANDARD_INFORMATION, AT_UNNAMED, 0,
(u8*)si, si_len)) {
err = errno;
ntfs_log_error("Failed to add STANDARD_INFORMATION "
"attribute.\n");
goto err_out;
}
/* Create SECURITY_DESCRIPTOR attribute (everyone has full access). */
/*
* Calculate security descriptor length. We have 2 sub-authorities in
* owner and group SIDs, but structure SID contain only one, so add
* 4 bytes to every SID.
*/
sd_len = sizeof(SECURITY_DESCRIPTOR_ATTR) + 2 * (sizeof(SID) + 4) +
sizeof(ACL) + sizeof(ACCESS_ALLOWED_ACE);
sd = calloc(1, sd_len);
if (!sd) {
err = errno;
ntfs_log_error("Not enough memory.\n");
goto err_out;
}
sd->revision = 1;
sd->control = SE_DACL_PRESENT | SE_SELF_RELATIVE;
sid = (SID*)((u8*)sd + sizeof(SECURITY_DESCRIPTOR_ATTR));
sd->owner = cpu_to_le32((u8*)sid - (u8*)sd);
sid->revision = 1;
sid->sub_authority_count = 2;
sid->sub_authority[0] = cpu_to_le32(32);
sid->sub_authority[1] = cpu_to_le32(544);
sid->identifier_authority.value[5] = 5;
sid = (SID*)((u8*)sid + sizeof(SID) + 4);
sd->group = cpu_to_le32((u8*)sid - (u8*)sd);
sid->revision = 1;
sid->sub_authority_count = 2;
sid->sub_authority[0] = cpu_to_le32(32);
sid->sub_authority[1] = cpu_to_le32(544);
sid->identifier_authority.value[5] = 5;
acl = (ACL*)((u8*)sid + sizeof(SID) + 4);
sd->dacl = cpu_to_le32((u8*)acl - (u8*)sd);
acl->revision = 2;
acl->size = cpu_to_le16(sizeof(ACL) + sizeof(ACCESS_ALLOWED_ACE));
acl->ace_count = cpu_to_le16(1);
ace = (ACCESS_ALLOWED_ACE*)((u8*)acl + sizeof(ACL));
ace->type = ACCESS_ALLOWED_ACE_TYPE;
ace->flags = OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE;
ace->size = cpu_to_le16(sizeof(ACCESS_ALLOWED_ACE));
ace->mask = cpu_to_le32(0x1f01ff); /* FIXME */
ace->sid.revision = 1;
ace->sid.sub_authority_count = 1;
ace->sid.sub_authority[0] = 0;
ace->sid.identifier_authority.value[5] = 1;
/* Add SECURITY_DESCRIPTOR attribute to inode. */
if (ntfs_attr_add(ni, AT_SECURITY_DESCRIPTOR, AT_UNNAMED, 0,
(u8*)sd, sd_len)) {
err = errno;
ntfs_log_error("Failed to add SECURITY_DESCRIPTOR "
"attribute.\n");
goto err_out;
}
rollback_sd = 1;
/* Add DATA/INDEX_ROOT attribute. */
if (S_ISDIR(type)) {
INDEX_ROOT *ir = NULL;
INDEX_ENTRY *ie;
int ir_len, index_len;
/* Create INDEX_ROOT attribute. */
index_len = sizeof(INDEX_HEADER) + sizeof(INDEX_ENTRY_HEADER);
ir_len = offsetof(INDEX_ROOT, index) + index_len;
ir = calloc(1, ir_len);
if (!ir) {
err = errno;
ntfs_log_error("Not enough memory.\n");
goto err_out;
}
ir->type = AT_FILE_NAME;
ir->collation_rule = COLLATION_FILE_NAME;
ir->index_block_size = cpu_to_le32(ni->vol->indx_record_size);
if (ni->vol->cluster_size <= ni->vol->indx_record_size)
ir->clusters_per_index_block =
ni->vol->indx_record_size >>
ni->vol->cluster_size_bits;
else
ir->clusters_per_index_block =
ni->vol->indx_record_size >>
ni->vol->sector_size_bits;
ir->index.entries_offset = cpu_to_le32(sizeof(INDEX_HEADER));
ir->index.index_length = cpu_to_le32(index_len);
ir->index.allocated_size = cpu_to_le32(index_len);
ie = (INDEX_ENTRY*)((u8*)ir + sizeof(INDEX_ROOT));
ie->length = cpu_to_le16(sizeof(INDEX_ENTRY_HEADER));
ie->key_length = 0;
ie->flags = INDEX_ENTRY_END;
/* Add INDEX_ROOT attribute to inode. */
if (ntfs_attr_add(ni, AT_INDEX_ROOT, NTFS_INDEX_I30, 4,
(u8*)ir, ir_len)) {
err = errno;
free(ir);
ntfs_log_error("Failed to add INDEX_ROOT attribute.\n");
goto err_out;
}
free(ir);
} else {
INTX_FILE *data;
int data_len;
switch (type) {
case S_IFBLK:
case S_IFCHR:
data_len = offsetof(INTX_FILE, u.s.device_end);
data = ntfs_malloc(data_len);
if (!data) {
err = errno;
goto err_out;
}
data->u.s.major = cpu_to_le64(major(dev));
data->u.s.minor = cpu_to_le64(minor(dev));
if (type == S_IFBLK)
data->magic = INTX_BLOCK_DEVICE;
if (type == S_IFCHR)
data->magic = INTX_CHARACTER_DEVICE;
break;
case S_IFLNK:
data_len = sizeof(INTX_FILE_TYPES) +
target_len * sizeof(ntfschar);
data = ntfs_malloc(data_len);
if (!data) {
err = errno;
goto err_out;
}
data->magic = INTX_SYMBOLIC_LINK;
memcpy(data->u.target, target,
target_len * sizeof(ntfschar));
break;
case S_IFSOCK:
data = NULL;
data_len = 1;
break;
default: /* FIFO or regular file. */
data = NULL;
data_len = 0;
break;
}
/* Add DATA attribute to inode. */
if (ntfs_attr_add(ni, AT_DATA, AT_UNNAMED, 0, (u8*)data,
data_len)) {
err = errno;
free(data);
ntfs_log_error("Failed to add DATA attribute.\n");
goto err_out;
}
rollback_data = 1;
free(data);
}
/* Create FILE_NAME attribute. */
fn_len = sizeof(FILE_NAME_ATTR) + name_len * sizeof(ntfschar);
fn = ntfs_calloc(fn_len);
if (!fn) {
err = errno;
goto err_out;
}
fn->parent_directory = MK_LE_MREF(dir_ni->mft_no,
le16_to_cpu(dir_ni->mrec->sequence_number));
fn->file_name_length = name_len;
fn->file_name_type = FILE_NAME_POSIX;
if (S_ISDIR(type))
fn->file_attributes = FILE_ATTR_I30_INDEX_PRESENT;
if (!S_ISREG(type) && !S_ISDIR(type))
fn->file_attributes = FILE_ATTR_SYSTEM;
fn->creation_time = utc2ntfs(ni->creation_time);
fn->last_data_change_time = utc2ntfs(ni->last_data_change_time);
fn->last_mft_change_time = utc2ntfs(ni->last_mft_change_time);
fn->last_access_time = utc2ntfs(ni->last_access_time);
memcpy(fn->file_name, name, name_len * sizeof(ntfschar));
/* Add FILE_NAME attribute to inode. */
if (ntfs_attr_add(ni, AT_FILE_NAME, AT_UNNAMED, 0, (u8*)fn, fn_len)) {
err = errno;
ntfs_log_error("Failed to add FILE_NAME attribute.\n");
goto err_out;
}
/* Add FILE_NAME attribute to index. */
if (ntfs_index_add_filename(dir_ni, fn, MK_MREF(ni->mft_no,
le16_to_cpu(ni->mrec->sequence_number)))) {
err = errno;
ntfs_log_perror("Failed to add entry to the index");
goto err_out;
}
/* Set hard links count and directory flag. */
ni->mrec->link_count = cpu_to_le16(1);
if (S_ISDIR(type))
ni->mrec->flags |= MFT_RECORD_IS_DIRECTORY;
ntfs_inode_mark_dirty(ni);
/* Done! */
free(fn);
free(si);
free(sd);
ntfs_log_trace("Done.\n");
return ni;
err_out:
ntfs_log_trace("Failed.\n");
if (rollback_sd) {
ntfs_attr *na;
na = ntfs_attr_open(ni, AT_SECURITY_DESCRIPTOR, AT_UNNAMED, 0);
if (!na)
ntfs_log_perror("Failed to open SD (0x50) attribute of "
" inode 0x%llx. Run chkdsk.\n",
(unsigned long long)ni->mft_no);
else if (ntfs_attr_rm(na))
ntfs_log_perror("Failed to remove SD (0x50) attribute "
"of inode 0x%llx. Run chkdsk.\n",
(unsigned long long)ni->mft_no);
}
if (rollback_data) {
ntfs_attr *na;
na = ntfs_attr_open(ni, AT_DATA, AT_UNNAMED, 0);
if (!na)
ntfs_log_perror("Failed to open data attribute of "
" inode 0x%llx. Run chkdsk.\n",
(unsigned long long)ni->mft_no);
else if (ntfs_attr_rm(na))
ntfs_log_perror("Failed to remove data attribute of "
"inode 0x%llx. Run chkdsk.\n",
(unsigned long long)ni->mft_no);
}
/*
* Free extent MFT records (should not exist any with current
* ntfs_create implementation, but for any case if something will be
* changed in the future).
*/
while (ni->nr_extents)
if (ntfs_mft_record_free(ni->vol, *(ni->u.extent_nis))) {
err = errno;
ntfs_log_error("Failed to free extent MFT record. "
"Leaving inconsistent metadata.\n");
}
if (ntfs_mft_record_free(ni->vol, ni))
ntfs_log_error("Failed to free MFT record. "
"Leaving inconsistent metadata. Run chkdsk.\n");
free(fn);
free(si);
free(sd);
errno = err;
return NULL;
}
/**
* Some wrappers around __ntfs_create() ...
*/
ntfs_inode *ntfs_create(ntfs_inode *dir_ni, ntfschar *name, u8 name_len,
dev_t type)
{
if (type != S_IFREG && type != S_IFDIR && type != S_IFIFO &&
type != S_IFSOCK) {
ntfs_log_error("Invalid arguments.\n");
return NULL;
}
return __ntfs_create(dir_ni, name, name_len, type, 0, NULL, 0);
}
ntfs_inode *ntfs_create_device(ntfs_inode *dir_ni, ntfschar *name, u8 name_len,
dev_t type, dev_t dev)
{
if (type != S_IFCHR && type != S_IFBLK) {
ntfs_log_error("Invalid arguments.\n");
return NULL;
}
return __ntfs_create(dir_ni, name, name_len, type, dev, NULL, 0);
}
ntfs_inode *ntfs_create_symlink(ntfs_inode *dir_ni, ntfschar *name, u8 name_len,
ntfschar *target, u8 target_len)
{
if (!target || !target_len) {
ntfs_log_error("Invalid arguments.\n");
return NULL;
}
return __ntfs_create(dir_ni, name, name_len, S_IFLNK, 0,
target, target_len);
}
/**
* ntfs_delete - delete file or directory from ntfs volume
* @pni: ntfs inode for object to delete
* @dir_ni: ntfs inode for directory in which delete object
* @name: unicode name of the object to delete
* @name_len: length of the name in unicode characters
*
* @pni is pointer to pointer to ntfs_inode structure. Upon successful
* completion and if inode is really deleted (there are no more links left to
* it) this function will close @*pni and set it to NULL, in the other cases
* @*pni will stay opened.
*
* Return 0 on success or -1 on error with errno set to the error code.
*/
int ntfs_delete(ntfs_inode **pni, ntfs_inode *dir_ni, ntfschar *name,
u8 name_len)
{
ntfs_attr_search_ctx *actx = NULL;
ntfs_index_context *ictx = NULL;
ntfs_inode *ni;
FILE_NAME_ATTR *fn = NULL;
BOOL looking_for_dos_name = FALSE, looking_for_win32_name = FALSE;
BOOL case_sensitive_match = TRUE;
int err = 0;
ntfs_log_trace("Entering.\n");
if (!pni || !(ni = *pni) || !dir_ni || !name || !name_len ||
ni->nr_extents == -1 || dir_ni->nr_extents == -1) {
ntfs_log_error("Invalid arguments.\n");
errno = EINVAL;
goto err_out;
}
if (ni->nr_references > 1 && le16_to_cpu(ni->mrec->link_count) == 1) {
ntfs_log_error("Trying to deleting inode with left "
"references.\n");
errno = EINVAL;
goto err_out;
}
/*
* Search for FILE_NAME attribute with such name. If it's in POSIX or
* WIN32_AND_DOS namespace, then simply remove it from index and inode.
* If filename in DOS or in WIN32 namespace, then remove DOS name first,
* only then remove WIN32 name. Mark WIN32 name as POSIX name to prevent
* chkdsk to complain about DOS name absence in case if DOS name had
* been successfully deleted, but WIN32 name remove failed.
*/
actx = ntfs_attr_get_search_ctx(ni, NULL);
if (!actx)
goto err_out;
search:
while (!ntfs_attr_lookup(AT_FILE_NAME, AT_UNNAMED, 0, CASE_SENSITIVE,
0, NULL, 0, actx)) {
errno = 0;
fn = (FILE_NAME_ATTR*)((u8*)actx->attr +
le16_to_cpu(actx->attr->u.res.value_offset));
ntfs_log_trace("Found filename with instance number %d.\n",
le16_to_cpu(actx->attr->instance));
if (looking_for_dos_name) {
if (fn->file_name_type == FILE_NAME_DOS)
break;
else
continue;
}
if (looking_for_win32_name) {
if (fn->file_name_type == FILE_NAME_WIN32)
break;
else
continue;
}
if (dir_ni->mft_no == MREF_LE(fn->parent_directory) &&
ntfs_names_are_equal(fn->file_name,
fn->file_name_length, name,
name_len, case_sensitive_match ?
CASE_SENSITIVE : IGNORE_CASE, ni->vol->upcase,
ni->vol->upcase_len)) {
if (fn->file_name_type == FILE_NAME_WIN32) {
looking_for_dos_name = TRUE;
ntfs_attr_reinit_search_ctx(actx);
ntfs_log_trace("Restart search. "
"Looking for DOS name.\n");
continue;
}
if (fn->file_name_type == FILE_NAME_DOS)
looking_for_dos_name = TRUE;
break;
}
}
if (errno) {
/*
* If case sensitive search failed and volume mounted case
* insensitive, then try once again ignoring case.
*/
if (errno == ENOENT && !NVolCaseSensitive(ni->vol) &&
case_sensitive_match) {
case_sensitive_match = FALSE;
ntfs_attr_reinit_search_ctx(actx);
ntfs_log_trace("Restart search. Ignore case.");
goto search;
}
ntfs_log_error("Failed to find requested filename in FILE_NAME "
"attributes that belong to this inode.\n");
goto err_out;
}
/* If deleting directory check it to be empty. */
if (ni->mrec->flags & MFT_RECORD_IS_DIRECTORY) {
ntfs_attr *na;
na = ntfs_attr_open(ni, AT_INDEX_ROOT, NTFS_INDEX_I30, 4);
if (!na) {
ntfs_log_error("Corrupt directory or library bug.\n");
errno = EIO;
goto err_out;
}
/*
* Do not allow non-empty directory deletion if hard links count
* is 1 (always) or 2 (in case if filename in DOS namespace,
* because we delete it first in file which have both WIN32 and
* DOS names).
*/
if ((na->data_size != sizeof(INDEX_ROOT) + sizeof(
INDEX_ENTRY_HEADER)) && (le16_to_cpu(
ni->mrec->link_count) == 1 ||
(le16_to_cpu(ni->mrec->link_count) == 2 &&
fn->file_name_type == FILE_NAME_DOS))) {
ntfs_attr_close(na);
ntfs_log_error("Directory is not empty.\n");
errno = ENOTEMPTY;
goto err_out;
}
ntfs_attr_close(na);
}
/* One more sanity check. */
if (ni->nr_references > 1 && looking_for_dos_name &&
le16_to_cpu(ni->mrec->link_count) == 2) {
ntfs_log_error("Trying to deleting inode with left "
"references.\n");
errno = EINVAL;
goto err_out;
}
ntfs_log_trace("Found!\n");
/* Search for such FILE_NAME in index. */
ictx = ntfs_index_ctx_get(dir_ni, NTFS_INDEX_I30, 4);
if (!ictx)
goto err_out;
if (ntfs_index_lookup(fn, le32_to_cpu(actx->attr->u.res.value_length), ictx))
goto err_out;
/* Set namespace to POSIX for WIN32 name. */
if (fn->file_name_type == FILE_NAME_WIN32) {
fn->file_name_type = FILE_NAME_POSIX;
ntfs_inode_mark_dirty(actx->ntfs_ino);
((FILE_NAME_ATTR*)ictx->data)->file_name_type = FILE_NAME_POSIX;
ntfs_index_entry_mark_dirty(ictx);
}
/* Do not support reparse point deletion yet. */
if (((FILE_NAME_ATTR*)ictx->data)->file_attributes &
FILE_ATTR_REPARSE_POINT) {
errno = EOPNOTSUPP;
goto err_out;
}
/* Remove FILE_NAME from index. */
if (ntfs_index_rm(ictx))
goto err_out;
/* Remove FILE_NAME from inode. */
if (ntfs_attr_record_rm(actx))
goto err_out;
/* Decrement hard link count. */
ni->mrec->link_count = cpu_to_le16(le16_to_cpu(
ni->mrec->link_count) - 1);
ntfs_inode_mark_dirty(ni);
if (looking_for_dos_name) {
looking_for_dos_name = FALSE;
looking_for_win32_name = TRUE;
ntfs_attr_reinit_search_ctx(actx);
ntfs_log_trace("DOS name deleted. "
"Now search for WIN32 name.\n");
goto search;
} else
ntfs_log_trace("Deleted.\n");
/* TODO: Update object id, quota and security indexes if required. */
/*
* If hard link count is not equal to zero then we are done. In other
* case there are no reference to this inode left, so we should free all
* non-resident attributes and mark all MFT record as not in use.
*/
if (ni->mrec->link_count)
goto out;
ntfs_attr_reinit_search_ctx(actx);
while (!ntfs_attrs_walk(actx)) {
if (actx->attr->non_resident) {
runlist *rl;
rl = ntfs_mapping_pairs_decompress(ni->vol, actx->attr,
NULL);
if (!rl) {
err = errno;
ntfs_log_error("Failed to decompress runlist. "
"Leaving inconsistent "
"metadata.\n");
continue;
}
if (ntfs_cluster_free_from_rl(ni->vol, rl)) {
err = errno;
ntfs_log_error("Failed to free clusters. "
"Leaving inconsistent "
"metadata.\n");
continue;
}
free(rl);
}
}
if (errno != ENOENT) {
err = errno;
ntfs_log_error("Attribute enumeration failed. "
"Probably leaving inconsistent metadata.\n");
}
/* All extents should be attached after attribute walk. */
while (ni->nr_extents)
if (ntfs_mft_record_free(ni->vol, *(ni->u.extent_nis))) {
err = errno;
ntfs_log_error("Failed to free extent MFT record. "
"Leaving inconsistent metadata.\n");
}
if (ntfs_mft_record_free(ni->vol, ni)) {
err = errno;
ntfs_log_error("Failed to free base MFT record. "
"Leaving inconsistent metadata.\n");
}
*pni = NULL;
out:
if (actx)
ntfs_attr_put_search_ctx(actx);
if (ictx)
ntfs_index_ctx_put(ictx);
if (err) {
ntfs_log_error("%s(): Failed.\n", "ntfs_delete");
errno = err;
return -1;
}
ntfs_log_trace("Done.\n");
return 0;
err_out:
err = errno;
goto out;
}
/**
* ntfs_link - create hard link for file or directory
* @ni: ntfs inode for object to create hard link
* @dir_ni: ntfs inode for directory in which new link should be placed
* @name: unicode name of the new link
* @name_len: length of the name in unicode characters
*
* NOTE: At present we allow creating hard links to directories, we use them
* in a temporary state during rename. But it's definitely bad idea to have
* hard links to directories as a result of operation.
* FIXME: Create internal __ntfs_link that allows hard links to a directories
* and external ntfs_link that do not. Write ntfs_rename that uses __ntfs_link.
*
* Return 0 on success or -1 on error with errno set to the error code.
*/
int ntfs_link(ntfs_inode *ni, ntfs_inode *dir_ni, ntfschar *name, u8 name_len)
{
FILE_NAME_ATTR *fn = NULL;
int fn_len, err;
ntfs_log_trace("Entering.\n");
if (!ni || !dir_ni || !name || !name_len ||
ni->mft_no == dir_ni->mft_no) {
err = EINVAL;
ntfs_log_error("Invalid arguments.");
goto err_out;
}
/* FIXME: Reparse points requires special handling. */
if (ni->flags & FILE_ATTR_REPARSE_POINT) {
err = EOPNOTSUPP;
goto err_out;
}
/* Create FILE_NAME attribute. */
fn_len = sizeof(FILE_NAME_ATTR) + name_len * sizeof(ntfschar);
fn = ntfs_calloc(fn_len);
if (!fn) {
err = errno;
goto err_out;
}
fn->parent_directory = MK_LE_MREF(dir_ni->mft_no,
le16_to_cpu(dir_ni->mrec->sequence_number));
fn->file_name_length = name_len;
fn->file_name_type = FILE_NAME_POSIX;
fn->file_attributes = ni->flags;
if (ni->mrec->flags & MFT_RECORD_IS_DIRECTORY)
fn->file_attributes |= FILE_ATTR_I30_INDEX_PRESENT;
fn->allocated_size = cpu_to_sle64(ni->allocated_size);
fn->data_size = cpu_to_sle64(ni->data_size);
fn->creation_time = utc2ntfs(ni->creation_time);
fn->last_data_change_time = utc2ntfs(ni->last_data_change_time);
fn->last_mft_change_time = utc2ntfs(ni->last_mft_change_time);
fn->last_access_time = utc2ntfs(ni->last_access_time);
memcpy(fn->file_name, name, name_len * sizeof(ntfschar));
/* Add FILE_NAME attribute to index. */
if (ntfs_index_add_filename(dir_ni, fn, MK_MREF(ni->mft_no,
le16_to_cpu(ni->mrec->sequence_number)))) {
err = errno;
ntfs_log_error("Failed to add entry to the index.\n");
goto err_out;
}
/* Add FILE_NAME attribute to inode. */
if (ntfs_attr_add(ni, AT_FILE_NAME, AT_UNNAMED, 0, (u8*)fn, fn_len)) {
ntfs_index_context *ictx;
err = errno;
ntfs_log_error("Failed to add FILE_NAME attribute.\n");
/* Try to remove just added attribute from index. */
ictx = ntfs_index_ctx_get(dir_ni, NTFS_INDEX_I30, 4);
if (!ictx)
goto rollback_failed;
if (ntfs_index_lookup(fn, fn_len, ictx)) {
ntfs_index_ctx_put(ictx);
goto rollback_failed;
}
if (ntfs_index_rm(ictx)) {
ntfs_index_ctx_put(ictx);
goto rollback_failed;
}
goto err_out;
}
/* Increment hard links count. */
ni->mrec->link_count = cpu_to_le16(le16_to_cpu(
ni->mrec->link_count) + 1);
/* Done! */
ntfs_inode_mark_dirty(ni);
free(fn);
ntfs_log_trace("Done.\n");
return 0;
rollback_failed:
ntfs_log_error("Rollback failed. Leaving inconsistent metadata.\n");
err_out:
ntfs_log_error("%s(): Failed.\n", "ntfs_link");
free(fn);
errno = err;
return -1;
}