Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
kernel-fxtec-pro1x/fs/cifs/readdir.c
Steve French 3020a1f58c [CIFS] Fix scheduling while atomic when pending writes at file close time 
Fix the case in which readdir reset file type when SFU mount option
specified.

Also fix sfu related functions to not request EAs (xattrs) when not
configured in Kconfig

Signed-off-by: Steve French <sfrench@us.ibm.com>
2005-11-18 11:31:10 -08:00

990 lines
30 KiB
C
Raw Blame History

/*
* fs/cifs/readdir.c
*
* Directory search handling
*
* Copyright (C) International Business Machines Corp., 2004, 2005
* Author(s): Steve French (sfrench@us.ibm.com)
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/smp_lock.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifsfs.h"
/* BB fixme - add debug wrappers around this function to disable it fixme BB */
/* static void dump_cifs_file_struct(struct file *file, char *label)
{
struct cifsFileInfo * cf;
if(file) {
cf = file->private_data;
if(cf == NULL) {
cFYI(1,("empty cifs private file data"));
return;
}
if(cf->invalidHandle) {
cFYI(1,("invalid handle"));
}
if(cf->srch_inf.endOfSearch) {
cFYI(1,("end of search"));
}
if(cf->srch_inf.emptyDir) {
cFYI(1,("empty dir"));
}
}
} */
/* Returns one if new inode created (which therefore needs to be hashed) */
/* Might check in the future if inode number changed so we can rehash inode */
static int construct_dentry(struct qstr *qstring, struct file *file,
struct inode **ptmp_inode, struct dentry **pnew_dentry)
{
struct dentry *tmp_dentry;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
int rc = 0;
cFYI(1, ("For %s", qstring->name));
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
pTcon = cifs_sb->tcon;
qstring->hash = full_name_hash(qstring->name, qstring->len);
tmp_dentry = d_lookup(file->f_dentry, qstring);
if (tmp_dentry) {
cFYI(0, ("existing dentry with inode 0x%p", tmp_dentry->d_inode));
*ptmp_inode = tmp_dentry->d_inode;
/* BB overwrite old name? i.e. tmp_dentry->d_name and tmp_dentry->d_name.len??*/
if(*ptmp_inode == NULL) {
*ptmp_inode = new_inode(file->f_dentry->d_sb);
if(*ptmp_inode == NULL)
return rc;
rc = 1;
d_instantiate(tmp_dentry, *ptmp_inode);
}
} else {
tmp_dentry = d_alloc(file->f_dentry, qstring);
if(tmp_dentry == NULL) {
cERROR(1,("Failed allocating dentry"));
*ptmp_inode = NULL;
return rc;
}
*ptmp_inode = new_inode(file->f_dentry->d_sb);
if (pTcon->nocase)
tmp_dentry->d_op = &cifs_ci_dentry_ops;
else
tmp_dentry->d_op = &cifs_dentry_ops;
if(*ptmp_inode == NULL)
return rc;
rc = 1;
d_instantiate(tmp_dentry, *ptmp_inode);
d_rehash(tmp_dentry);
}
tmp_dentry->d_time = jiffies;
*pnew_dentry = tmp_dentry;
return rc;
}
static void fill_in_inode(struct inode *tmp_inode,
FILE_DIRECTORY_INFO *pfindData, int *pobject_type, int isNewInode)
{
loff_t local_size;
struct timespec local_mtime;
struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
__u32 attr = le32_to_cpu(pfindData->ExtFileAttributes);
__u64 allocation_size = le64_to_cpu(pfindData->AllocationSize);
__u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
cifsInfo->cifsAttrs = attr;
cifsInfo->time = jiffies;
/* save mtime and size */
local_mtime = tmp_inode->i_mtime;
local_size = tmp_inode->i_size;
/* Linux can not store file creation time unfortunately so ignore it */
tmp_inode->i_atime =
cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
tmp_inode->i_mtime =
cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastWriteTime));
tmp_inode->i_ctime =
cifs_NTtimeToUnix(le64_to_cpu(pfindData->ChangeTime));
/* treat dos attribute of read-only as read-only mode bit e.g. 555? */
/* 2767 perms - indicate mandatory locking */
/* BB fill in uid and gid here? with help from winbind?
or retrieve from NTFS stream extended attribute */
if (atomic_read(&cifsInfo->inUse) == 0) {
tmp_inode->i_uid = cifs_sb->mnt_uid;
tmp_inode->i_gid = cifs_sb->mnt_gid;
/* set default mode. will override for dirs below */
tmp_inode->i_mode = cifs_sb->mnt_file_mode;
} else {
/* mask off the type bits since it gets set
below and we do not want to get two type
bits set */
tmp_inode->i_mode &= ~S_IFMT;
}
if (attr & ATTR_DIRECTORY) {
*pobject_type = DT_DIR;
/* override default perms since we do not lock dirs */
if(atomic_read(&cifsInfo->inUse) == 0) {
tmp_inode->i_mode = cifs_sb->mnt_dir_mode;
}
tmp_inode->i_mode |= S_IFDIR;
} else if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) &&
(attr & ATTR_SYSTEM)) {
if (end_of_file == 0) {
*pobject_type = DT_FIFO;
tmp_inode->i_mode |= S_IFIFO;
} else {
/* rather than get the type here, we mark the
inode as needing revalidate and get the real type
(blk vs chr vs. symlink) later ie in lookup */
*pobject_type = DT_REG;
tmp_inode->i_mode |= S_IFREG;
cifsInfo->time = 0;
}
/* we no longer mark these because we could not follow them */
/* } else if (attr & ATTR_REPARSE) {
*pobject_type = DT_LNK;
tmp_inode->i_mode |= S_IFLNK; */
} else {
*pobject_type = DT_REG;
tmp_inode->i_mode |= S_IFREG;
if (attr & ATTR_READONLY)
tmp_inode->i_mode &= ~(S_IWUGO);
} /* could add code here - to validate if device or weird share type? */
/* can not fill in nlink here as in qpathinfo version and Unx search */
if (atomic_read(&cifsInfo->inUse) == 0) {
atomic_set(&cifsInfo->inUse, 1);
}
if (is_size_safe_to_change(cifsInfo)) {
/* can not safely change the file size here if the
client is writing to it due to potential races */
i_size_write(tmp_inode, end_of_file);
/* 512 bytes (2**9) is the fake blocksize that must be used */
/* for this calculation, even though the reported blocksize is larger */
tmp_inode->i_blocks = (512 - 1 + allocation_size) >> 9;
}
if (allocation_size < end_of_file)
cFYI(1, ("May be sparse file, allocation less than file size"));
cFYI(1,
("File Size %ld and blocks %ld and blocksize %ld",
(unsigned long)tmp_inode->i_size, tmp_inode->i_blocks,
tmp_inode->i_blksize));
if (S_ISREG(tmp_inode->i_mode)) {
cFYI(1, ("File inode"));
tmp_inode->i_op = &cifs_file_inode_ops;
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) {
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
tmp_inode->i_fop = &cifs_file_direct_nobrl_ops;
else
tmp_inode->i_fop = &cifs_file_direct_ops;
} else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
tmp_inode->i_fop = &cifs_file_nobrl_ops;
else
tmp_inode->i_fop = &cifs_file_ops;
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
tmp_inode->i_fop->lock = NULL;
tmp_inode->i_data.a_ops = &cifs_addr_ops;
if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
(cifs_sb->tcon->ses->server->maxBuf <
4096 + MAX_CIFS_HDR_SIZE))
tmp_inode->i_data.a_ops->readpages = NULL;
if(isNewInode)
return; /* No sense invalidating pages for new inode
since have not started caching readahead file
data yet */
if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
(local_size == tmp_inode->i_size)) {
cFYI(1, ("inode exists but unchanged"));
} else {
/* file may have changed on server */
cFYI(1, ("invalidate inode, readdir detected change"));
invalidate_remote_inode(tmp_inode);
}
} else if (S_ISDIR(tmp_inode->i_mode)) {
cFYI(1, ("Directory inode"));
tmp_inode->i_op = &cifs_dir_inode_ops;
tmp_inode->i_fop = &cifs_dir_ops;
} else if (S_ISLNK(tmp_inode->i_mode)) {
cFYI(1, ("Symbolic Link inode"));
tmp_inode->i_op = &cifs_symlink_inode_ops;
} else {
cFYI(1, ("Init special inode"));
init_special_inode(tmp_inode, tmp_inode->i_mode,
tmp_inode->i_rdev);
}
}
static void unix_fill_in_inode(struct inode *tmp_inode,
FILE_UNIX_INFO *pfindData, int *pobject_type, int isNewInode)
{
loff_t local_size;
struct timespec local_mtime;
struct cifsInodeInfo *cifsInfo = CIFS_I(tmp_inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(tmp_inode->i_sb);
__u32 type = le32_to_cpu(pfindData->Type);
__u64 num_of_bytes = le64_to_cpu(pfindData->NumOfBytes);
__u64 end_of_file = le64_to_cpu(pfindData->EndOfFile);
cifsInfo->time = jiffies;
atomic_inc(&cifsInfo->inUse);
/* save mtime and size */
local_mtime = tmp_inode->i_mtime;
local_size = tmp_inode->i_size;
tmp_inode->i_atime =
cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastAccessTime));
tmp_inode->i_mtime =
cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastModificationTime));
tmp_inode->i_ctime =
cifs_NTtimeToUnix(le64_to_cpu(pfindData->LastStatusChange));
tmp_inode->i_mode = le64_to_cpu(pfindData->Permissions);
/* since we set the inode type below we need to mask off type
to avoid strange results if bits above were corrupt */
tmp_inode->i_mode &= ~S_IFMT;
if (type == UNIX_FILE) {
*pobject_type = DT_REG;
tmp_inode->i_mode |= S_IFREG;
} else if (type == UNIX_SYMLINK) {
*pobject_type = DT_LNK;
tmp_inode->i_mode |= S_IFLNK;
} else if (type == UNIX_DIR) {
*pobject_type = DT_DIR;
tmp_inode->i_mode |= S_IFDIR;
} else if (type == UNIX_CHARDEV) {
*pobject_type = DT_CHR;
tmp_inode->i_mode |= S_IFCHR;
tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
le64_to_cpu(pfindData->DevMinor) & MINORMASK);
} else if (type == UNIX_BLOCKDEV) {
*pobject_type = DT_BLK;
tmp_inode->i_mode |= S_IFBLK;
tmp_inode->i_rdev = MKDEV(le64_to_cpu(pfindData->DevMajor),
le64_to_cpu(pfindData->DevMinor) & MINORMASK);
} else if (type == UNIX_FIFO) {
*pobject_type = DT_FIFO;
tmp_inode->i_mode |= S_IFIFO;
} else if (type == UNIX_SOCKET) {
*pobject_type = DT_SOCK;
tmp_inode->i_mode |= S_IFSOCK;
} else {
/* safest to just call it a file */
*pobject_type = DT_REG;
tmp_inode->i_mode |= S_IFREG;
cFYI(1,("unknown inode type %d",type));
}
tmp_inode->i_uid = le64_to_cpu(pfindData->Uid);
tmp_inode->i_gid = le64_to_cpu(pfindData->Gid);
tmp_inode->i_nlink = le64_to_cpu(pfindData->Nlinks);
if (is_size_safe_to_change(cifsInfo)) {
/* can not safely change the file size here if the
client is writing to it due to potential races */
i_size_write(tmp_inode,end_of_file);
/* 512 bytes (2**9) is the fake blocksize that must be used */
/* for this calculation, not the real blocksize */
tmp_inode->i_blocks = (512 - 1 + num_of_bytes) >> 9;
}
if (S_ISREG(tmp_inode->i_mode)) {
cFYI(1, ("File inode"));
tmp_inode->i_op = &cifs_file_inode_ops;
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
tmp_inode->i_fop = &cifs_file_direct_ops;
else
tmp_inode->i_fop = &cifs_file_ops;
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
tmp_inode->i_fop->lock = NULL;
tmp_inode->i_data.a_ops = &cifs_addr_ops;
if((cifs_sb->tcon) && (cifs_sb->tcon->ses) &&
(cifs_sb->tcon->ses->server->maxBuf <
4096 + MAX_CIFS_HDR_SIZE))
tmp_inode->i_data.a_ops->readpages = NULL;
if(isNewInode)
return; /* No sense invalidating pages for new inode since we
have not started caching readahead file data yet */
if (timespec_equal(&tmp_inode->i_mtime, &local_mtime) &&
(local_size == tmp_inode->i_size)) {
cFYI(1, ("inode exists but unchanged"));
} else {
/* file may have changed on server */
cFYI(1, ("invalidate inode, readdir detected change"));
invalidate_remote_inode(tmp_inode);
}
} else if (S_ISDIR(tmp_inode->i_mode)) {
cFYI(1, ("Directory inode"));
tmp_inode->i_op = &cifs_dir_inode_ops;
tmp_inode->i_fop = &cifs_dir_ops;
} else if (S_ISLNK(tmp_inode->i_mode)) {
cFYI(1, ("Symbolic Link inode"));
tmp_inode->i_op = &cifs_symlink_inode_ops;
/* tmp_inode->i_fop = *//* do not need to set to anything */
} else {
cFYI(1, ("Special inode"));
init_special_inode(tmp_inode, tmp_inode->i_mode,
tmp_inode->i_rdev);
}
}
static int initiate_cifs_search(const int xid, struct file *file)
{
int rc = 0;
char * full_path;
struct cifsFileInfo * cifsFile;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
if(file->private_data == NULL) {
file->private_data =
kmalloc(sizeof(struct cifsFileInfo),GFP_KERNEL);
}
if(file->private_data == NULL) {
return -ENOMEM;
} else {
memset(file->private_data,0,sizeof(struct cifsFileInfo));
}
cifsFile = file->private_data;
cifsFile->invalidHandle = TRUE;
cifsFile->srch_inf.endOfSearch = FALSE;
if(file->f_dentry == NULL)
return -ENOENT;
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
if(cifs_sb == NULL)
return -EINVAL;
pTcon = cifs_sb->tcon;
if(pTcon == NULL)
return -EINVAL;
down(&file->f_dentry->d_sb->s_vfs_rename_sem);
full_path = build_path_from_dentry(file->f_dentry);
up(&file->f_dentry->d_sb->s_vfs_rename_sem);
if(full_path == NULL) {
return -ENOMEM;
}
cFYI(1, ("Full path: %s start at: %lld", full_path, file->f_pos));
ffirst_retry:
/* test for Unix extensions */
if (pTcon->ses->capabilities & CAP_UNIX) {
cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
} else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
cifsFile->srch_inf.info_level = SMB_FIND_FILE_ID_FULL_DIR_INFO;
} else /* not srvinos - BB fixme add check for backlevel? */ {
cifsFile->srch_inf.info_level = SMB_FIND_FILE_DIRECTORY_INFO;
}
rc = CIFSFindFirst(xid, pTcon,full_path,cifs_sb->local_nls,
&cifsFile->netfid, &cifsFile->srch_inf,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
if(rc == 0)
cifsFile->invalidHandle = FALSE;
if((rc == -EOPNOTSUPP) &&
(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
goto ffirst_retry;
}
kfree(full_path);
return rc;
}
/* return length of unicode string in bytes */
static int cifs_unicode_bytelen(char *str)
{
int len;
__le16 * ustr = (__le16 *)str;
for(len=0;len <= PATH_MAX;len++) {
if(ustr[len] == 0)
return len << 1;
}
cFYI(1,("Unicode string longer than PATH_MAX found"));
return len << 1;
}
static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
{
char * new_entry;
FILE_DIRECTORY_INFO * pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
new_entry = old_entry + le32_to_cpu(pDirInfo->NextEntryOffset);
cFYI(1,("new entry %p old entry %p",new_entry,old_entry));
/* validate that new_entry is not past end of SMB */
if(new_entry >= end_of_smb) {
cERROR(1,
("search entry %p began after end of SMB %p old entry %p",
new_entry, end_of_smb, old_entry));
return NULL;
} else if (new_entry + sizeof(FILE_DIRECTORY_INFO) > end_of_smb) {
cERROR(1,("search entry %p extends after end of SMB %p",
new_entry, end_of_smb));
return NULL;
} else
return new_entry;
}
#define UNICODE_DOT cpu_to_le16(0x2e)
/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent) */
static int cifs_entry_is_dot(char *current_entry, struct cifsFileInfo *cfile)
{
int rc = 0;
char * filename = NULL;
int len = 0;
if(cfile->srch_inf.info_level == 0x202) {
FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
filename = &pFindData->FileName[0];
if(cfile->srch_inf.unicode) {
len = cifs_unicode_bytelen(filename);
} else {
/* BB should we make this strnlen of PATH_MAX? */
len = strnlen(filename, 5);
}
} else if(cfile->srch_inf.info_level == 0x101) {
FILE_DIRECTORY_INFO * pFindData =
(FILE_DIRECTORY_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
} else if(cfile->srch_inf.info_level == 0x102) {
FILE_FULL_DIRECTORY_INFO * pFindData =
(FILE_FULL_DIRECTORY_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
} else if(cfile->srch_inf.info_level == 0x105) {
SEARCH_ID_FULL_DIR_INFO * pFindData =
(SEARCH_ID_FULL_DIR_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
} else if(cfile->srch_inf.info_level == 0x104) {
FILE_BOTH_DIRECTORY_INFO * pFindData =
(FILE_BOTH_DIRECTORY_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
} else {
cFYI(1,("Unknown findfirst level %d",cfile->srch_inf.info_level));
}
if(filename) {
if(cfile->srch_inf.unicode) {
__le16 *ufilename = (__le16 *)filename;
if(len == 2) {
/* check for . */
if(ufilename[0] == UNICODE_DOT)
rc = 1;
} else if(len == 4) {
/* check for .. */
if((ufilename[0] == UNICODE_DOT)
&&(ufilename[1] == UNICODE_DOT))
rc = 2;
}
} else /* ASCII */ {
if(len == 1) {
if(filename[0] == '.')
rc = 1;
} else if(len == 2) {
if((filename[0] == '.') && (filename[1] == '.'))
rc = 2;
}
}
}
return rc;
}
/* Check if directory that we are searching has changed so we can decide
whether we can use the cached search results from the previous search */
static int is_dir_changed(struct file * file)
{
struct inode * inode;
struct cifsInodeInfo *cifsInfo;
if(file->f_dentry == NULL)
return 0;
inode = file->f_dentry->d_inode;
if(inode == NULL)
return 0;
cifsInfo = CIFS_I(inode);
if(cifsInfo->time == 0)
return 1; /* directory was changed, perhaps due to unlink */
else
return 0;
}
/* find the corresponding entry in the search */
/* Note that the SMB server returns search entries for . and .. which
complicates logic here if we choose to parse for them and we do not
assume that they are located in the findfirst return buffer.*/
/* We start counting in the buffer with entry 2 and increment for every
entry (do not increment for . or .. entry) */
static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
struct file *file, char **ppCurrentEntry, int *num_to_ret)
{
int rc = 0;
int pos_in_buf = 0;
loff_t first_entry_in_buffer;
loff_t index_to_find = file->f_pos;
struct cifsFileInfo * cifsFile = file->private_data;
/* check if index in the buffer */
if((cifsFile == NULL) || (ppCurrentEntry == NULL) ||
(num_to_ret == NULL))
return -ENOENT;
*ppCurrentEntry = NULL;
first_entry_in_buffer =
cifsFile->srch_inf.index_of_last_entry -
cifsFile->srch_inf.entries_in_buffer;
/* dump_cifs_file_struct(file, "In fce ");*/
if(((index_to_find < cifsFile->srch_inf.index_of_last_entry) &&
is_dir_changed(file)) ||
(index_to_find < first_entry_in_buffer)) {
/* close and restart search */
cFYI(1,("search backing up - close and restart search"));
cifsFile->invalidHandle = TRUE;
CIFSFindClose(xid, pTcon, cifsFile->netfid);
kfree(cifsFile->search_resume_name);
cifsFile->search_resume_name = NULL;
if(cifsFile->srch_inf.ntwrk_buf_start) {
cFYI(1,("freeing SMB ff cache buf on search rewind"));
cifs_buf_release(cifsFile->srch_inf.ntwrk_buf_start);
}
rc = initiate_cifs_search(xid,file);
if(rc) {
cFYI(1,("error %d reinitiating a search on rewind",rc));
return rc;
}
}
while((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
(rc == 0) && (cifsFile->srch_inf.endOfSearch == FALSE)){
cFYI(1,("calling findnext2"));
rc = CIFSFindNext(xid,pTcon,cifsFile->netfid,
&cifsFile->srch_inf);
if(rc)
return -ENOENT;
}
if(index_to_find < cifsFile->srch_inf.index_of_last_entry) {
/* we found the buffer that contains the entry */
/* scan and find it */
int i;
char * current_entry;
char * end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
smbCalcSize((struct smb_hdr *)
cifsFile->srch_inf.ntwrk_buf_start);
first_entry_in_buffer = cifsFile->srch_inf.index_of_last_entry
- cifsFile->srch_inf.entries_in_buffer;
pos_in_buf = index_to_find - first_entry_in_buffer;
cFYI(1,("found entry - pos_in_buf %d",pos_in_buf));
current_entry = cifsFile->srch_inf.srch_entries_start;
for(i=0;(i<(pos_in_buf)) && (current_entry != NULL);i++) {
/* go entry by entry figuring out which is first */
/* if( . or ..)
skip */
rc = cifs_entry_is_dot(current_entry,cifsFile);
if(rc == 1) /* is . or .. so skip */ {
cFYI(1,("Entry is .")); /* BB removeme BB */
/* continue; */
} else if (rc == 2 ) {
cFYI(1,("Entry is ..")); /* BB removeme BB */
/* continue; */
}
current_entry = nxt_dir_entry(current_entry,end_of_smb);
}
if((current_entry == NULL) && (i < pos_in_buf)) {
/* BB fixme - check if we should flag this error */
cERROR(1,("reached end of buf searching for pos in buf"
" %d index to find %lld rc %d",
pos_in_buf,index_to_find,rc));
}
rc = 0;
*ppCurrentEntry = current_entry;
} else {
cFYI(1,("index not in buffer - could not findnext into it"));
return 0;
}
if(pos_in_buf >= cifsFile->srch_inf.entries_in_buffer) {
cFYI(1,("can not return entries pos_in_buf beyond last entry"));
*num_to_ret = 0;
} else
*num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
return rc;
}
/* inode num, inode type and filename returned */
static int cifs_get_name_from_search_buf(struct qstr *pqst,
char *current_entry, __u16 level, unsigned int unicode,
struct cifs_sb_info * cifs_sb, ino_t *pinum)
{
int rc = 0;
unsigned int len = 0;
char * filename;
struct nls_table * nlt = cifs_sb->local_nls;
*pinum = 0;
if(level == SMB_FIND_FILE_UNIX) {
FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
filename = &pFindData->FileName[0];
if(unicode) {
len = cifs_unicode_bytelen(filename);
} else {
/* BB should we make this strnlen of PATH_MAX? */
len = strnlen(filename, PATH_MAX);
}
/* BB fixme - hash low and high 32 bits if not 64 bit arch BB fixme */
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
*pinum = pFindData->UniqueId;
} else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
FILE_DIRECTORY_INFO * pFindData =
(FILE_DIRECTORY_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
} else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
FILE_FULL_DIRECTORY_INFO * pFindData =
(FILE_FULL_DIRECTORY_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
} else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
SEARCH_ID_FULL_DIR_INFO * pFindData =
(SEARCH_ID_FULL_DIR_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
*pinum = pFindData->UniqueId;
} else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
FILE_BOTH_DIRECTORY_INFO * pFindData =
(FILE_BOTH_DIRECTORY_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
} else {
cFYI(1,("Unknown findfirst level %d",level));
return -EINVAL;
}
if(unicode) {
/* BB fixme - test with long names */
/* Note converted filename can be longer than in unicode */
if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
pqst->len = cifs_convertUCSpath((char *)pqst->name,
(__le16 *)filename, len/2, nlt);
else
pqst->len = cifs_strfromUCS_le((char *)pqst->name,
(__le16 *)filename,len/2,nlt);
} else {
pqst->name = filename;
pqst->len = len;
}
pqst->hash = full_name_hash(pqst->name,pqst->len);
/* cFYI(1,("filldir on %s",pqst->name)); */
return rc;
}
static int cifs_filldir(char *pfindEntry, struct file *file,
filldir_t filldir, void *direntry, char *scratch_buf)
{
int rc = 0;
struct qstr qstring;
struct cifsFileInfo * pCifsF;
unsigned obj_type;
ino_t inum;
struct cifs_sb_info * cifs_sb;
struct inode *tmp_inode;
struct dentry *tmp_dentry;
/* get filename and len into qstring */
/* get dentry */
/* decide whether to create and populate ionde */
if((direntry == NULL) || (file == NULL))
return -EINVAL;
pCifsF = file->private_data;
if((scratch_buf == NULL) || (pfindEntry == NULL) || (pCifsF == NULL))
return -ENOENT;
if(file->f_dentry == NULL)
return -ENOENT;
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
qstring.name = scratch_buf;
rc = cifs_get_name_from_search_buf(&qstring,pfindEntry,
pCifsF->srch_inf.info_level,
pCifsF->srch_inf.unicode,cifs_sb,
&inum /* returned */);
if(rc)
return rc;
rc = construct_dentry(&qstring,file,&tmp_inode, &tmp_dentry);
if((tmp_inode == NULL) || (tmp_dentry == NULL))
return -ENOMEM;
if(rc) {
/* inode created, we need to hash it with right inode number */
if(inum != 0) {
/* BB fixme - hash the 2 32 quantities bits together if necessary BB */
tmp_inode->i_ino = inum;
}
insert_inode_hash(tmp_inode);
}
/* we pass in rc below, indicating whether it is a new inode,
so we can figure out whether to invalidate the inode cached
data if the file has changed */
if(pCifsF->srch_inf.info_level == SMB_FIND_FILE_UNIX) {
unix_fill_in_inode(tmp_inode,
(FILE_UNIX_INFO *)pfindEntry,&obj_type, rc);
} else {
fill_in_inode(tmp_inode,
(FILE_DIRECTORY_INFO *)pfindEntry,&obj_type, rc);
}
rc = filldir(direntry,qstring.name,qstring.len,file->f_pos,
tmp_inode->i_ino,obj_type);
if(rc) {
cFYI(1,("filldir rc = %d",rc));
}
dput(tmp_dentry);
return rc;
}
static int cifs_save_resume_key(const char *current_entry,
struct cifsFileInfo *cifsFile)
{
int rc = 0;
unsigned int len = 0;
__u16 level;
char * filename;
if((cifsFile == NULL) || (current_entry == NULL))
return -EINVAL;
level = cifsFile->srch_inf.info_level;
if(level == SMB_FIND_FILE_UNIX) {
FILE_UNIX_INFO * pFindData = (FILE_UNIX_INFO *)current_entry;
filename = &pFindData->FileName[0];
if(cifsFile->srch_inf.unicode) {
len = cifs_unicode_bytelen(filename);
} else {
/* BB should we make this strnlen of PATH_MAX? */
len = strnlen(filename, PATH_MAX);
}
cifsFile->srch_inf.resume_key = pFindData->ResumeKey;
} else if(level == SMB_FIND_FILE_DIRECTORY_INFO) {
FILE_DIRECTORY_INFO * pFindData =
(FILE_DIRECTORY_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
cifsFile->srch_inf.resume_key = pFindData->FileIndex;
} else if(level == SMB_FIND_FILE_FULL_DIRECTORY_INFO) {
FILE_FULL_DIRECTORY_INFO * pFindData =
(FILE_FULL_DIRECTORY_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
cifsFile->srch_inf.resume_key = pFindData->FileIndex;
} else if(level == SMB_FIND_FILE_ID_FULL_DIR_INFO) {
SEARCH_ID_FULL_DIR_INFO * pFindData =
(SEARCH_ID_FULL_DIR_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
cifsFile->srch_inf.resume_key = pFindData->FileIndex;
} else if(level == SMB_FIND_FILE_BOTH_DIRECTORY_INFO) {
FILE_BOTH_DIRECTORY_INFO * pFindData =
(FILE_BOTH_DIRECTORY_INFO *)current_entry;
filename = &pFindData->FileName[0];
len = le32_to_cpu(pFindData->FileNameLength);
cifsFile->srch_inf.resume_key = pFindData->FileIndex;
} else {
cFYI(1,("Unknown findfirst level %d",level));
return -EINVAL;
}
cifsFile->srch_inf.resume_name_len = len;
cifsFile->srch_inf.presume_name = filename;
return rc;
}
int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
{
int rc = 0;
int xid,i;
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
struct cifsFileInfo *cifsFile = NULL;
char * current_entry;
int num_to_fill = 0;
char * tmp_buf = NULL;
char * end_of_smb;
xid = GetXid();
if(file->f_dentry == NULL) {
FreeXid(xid);
return -EIO;
}
cifs_sb = CIFS_SB(file->f_dentry->d_sb);
pTcon = cifs_sb->tcon;
if(pTcon == NULL)
return -EINVAL;
switch ((int) file->f_pos) {
case 0:
/*if (filldir(direntry, ".", 1, file->f_pos,
file->f_dentry->d_inode->i_ino, DT_DIR) < 0) {
cERROR(1, ("Filldir for current dir failed "));
rc = -ENOMEM;
break;
}
file->f_pos++; */
case 1:
/* if (filldir(direntry, "..", 2, file->f_pos,
file->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
cERROR(1, ("Filldir for parent dir failed "));
rc = -ENOMEM;
break;
}
file->f_pos++; */
case 2:
/* 1) If search is active,
is in current search buffer?
if it before then restart search
if after then keep searching till find it */
if(file->private_data == NULL) {
rc = initiate_cifs_search(xid,file);
cFYI(1,("initiate cifs search rc %d",rc));
if(rc) {
FreeXid(xid);
return rc;
}
}
default:
if(file->private_data == NULL) {
rc = -EINVAL;
FreeXid(xid);
return rc;
}
cifsFile = file->private_data;
if (cifsFile->srch_inf.endOfSearch) {
if(cifsFile->srch_inf.emptyDir) {
cFYI(1, ("End of search, empty dir"));
rc = 0;
break;
}
} /* else {
cifsFile->invalidHandle = TRUE;
CIFSFindClose(xid, pTcon, cifsFile->netfid);
}
kfree(cifsFile->search_resume_name);
cifsFile->search_resume_name = NULL; */
/* BB account for . and .. in f_pos as special case */
rc = find_cifs_entry(xid,pTcon, file,
&current_entry,&num_to_fill);
if(rc) {
cFYI(1,("fce error %d",rc));
goto rddir2_exit;
} else if (current_entry != NULL) {
cFYI(1,("entry %lld found",file->f_pos));
} else {
cFYI(1,("could not find entry"));
goto rddir2_exit;
}
cFYI(1,("loop through %d times filling dir for net buf %p",
num_to_fill,cifsFile->srch_inf.ntwrk_buf_start));
end_of_smb = cifsFile->srch_inf.ntwrk_buf_start +
smbCalcSize((struct smb_hdr *)
cifsFile->srch_inf.ntwrk_buf_start);
/* To be safe - for UCS to UTF-8 with strings loaded
with the rare long characters alloc more to account for
such multibyte target UTF-8 characters. cifs_unicode.c,
which actually does the conversion, has the same limit */
tmp_buf = kmalloc((2 * NAME_MAX) + 4, GFP_KERNEL);
for(i=0;(i<num_to_fill) && (rc == 0);i++) {
if(current_entry == NULL) {
/* evaluate whether this case is an error */
cERROR(1,("past end of SMB num to fill %d i %d",
num_to_fill, i));
break;
}
rc = cifs_filldir(current_entry, file,
filldir, direntry,tmp_buf);
file->f_pos++;
if(file->f_pos == cifsFile->srch_inf.index_of_last_entry) {
cFYI(1,("last entry in buf at pos %lld %s",
file->f_pos,tmp_buf)); /* BB removeme BB */
cifs_save_resume_key(current_entry,cifsFile);
break;
} else
current_entry = nxt_dir_entry(current_entry,
end_of_smb);
}
kfree(tmp_buf);
break;
} /* end switch */
rddir2_exit:
FreeXid(xid);
return rc;
}
Reference in a new issue View git blame Copy permalink