From: Pavel Shilovsky <[email protected]>
Signed-off-by: Pavel Shilovsky <[email protected]>
---
fs/cifs/cifsproto.h | 4 +
fs/cifs/file.c | 68 ++++---
fs/cifs/readdir.c | 4 +-
fs/cifs/smb2dir.c | 2 +-
fs/cifs/smb2glob.h | 1 -
fs/cifs/smb2pdu.c | 20 +-
fs/cifs/smb2proto.h | 7 +-
fs/cifs/smb2readdir.c | 591 +++++++++++++++++++++++++++++++++++++++++++++++++
8 files changed, 651 insertions(+), 46 deletions(-)
create mode 100644 fs/cifs/smb2readdir.c
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index e540117..4285c10 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -216,6 +216,10 @@ extern int cifs_writepages_generic(struct address_space
*mapping,
struct writeback_control *wbc,
awritev_callback_t *async_writev);
extern int cifs_writepage(struct page *page, struct writeback_control *wbc);
+extern int is_dir_changed(struct file *file);
+extern struct dentry *cifs_readdir_lookup(struct dentry *parent,
+ struct qstr *name,
+ struct cifs_fattr *fattr);
void cifs_proc_init(void);
void cifs_proc_clean(void);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index d090b6b..22cf18b 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -658,47 +658,55 @@ int cifs_closedir(struct inode *inode, struct file *file)
{
int rc = 0;
int xid;
- struct cifsFileInfo *pCFileStruct = file->private_data;
- char *ptmp;
+ struct cifsFileInfo *cfile = file->private_data;
+ struct cifs_tcon *tcon;
+ char *buf;
cFYI(1, "Closedir inode = 0x%p", inode);
+ if (cfile == NULL)
+ return rc;
+
xid = GetXid();
+ tcon = tlink_tcon(cfile->tlink);
- if (pCFileStruct) {
- struct cifs_tcon *pTcon = tlink_tcon(pCFileStruct->tlink);
+ cFYI(1, "Freeing private data in close dir");
+ spin_lock(&cifs_file_list_lock);
+ if (!cfile->srch_inf.endOfSearch && !cfile->invalidHandle) {
+ cfile->invalidHandle = true;
+ spin_unlock(&cifs_file_list_lock);
+#ifdef CONFIG_CIFS_SMB2
+ if (tcon->ses->server->is_smb2)
+ rc = SMB2_close(xid, tcon, cfile->persist_fid,
+ cfile->volatile_fid);
+ else
+#endif
+ rc = CIFSFindClose(xid, tcon, cfile->netfid);
+ cFYI(1, "Closing uncompleted readdir with rc %d", rc);
+ /* not much we can do if it fails anyway, ignore rc */
+ rc = 0;
+ } else
+ spin_unlock(&cifs_file_list_lock);
- cFYI(1, "Freeing private data in close dir");
- spin_lock(&cifs_file_list_lock);
- if (!pCFileStruct->srch_inf.endOfSearch &&
- !pCFileStruct->invalidHandle) {
- pCFileStruct->invalidHandle = true;
- spin_unlock(&cifs_file_list_lock);
- rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
- cFYI(1, "Closing uncompleted readdir with rc %d",
- rc);
- /* not much we can do if it fails anyway, ignore rc */
- rc = 0;
- } else
- spin_unlock(&cifs_file_list_lock);
- ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
- if (ptmp) {
- cFYI(1, "closedir free smb buf in srch struct");
- pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
- if (pCFileStruct->srch_inf.smallBuf)
- cifs_small_buf_release(ptmp);
- else
- cifs_buf_release(ptmp);
- }
- cifs_put_tlink(pCFileStruct->tlink);
- kfree(file->private_data);
- file->private_data = NULL;
+ buf = cfile->srch_inf.ntwrk_buf_start;
+ if (buf) {
+ cFYI(1, "closedir free smb buf in srch struct");
+ cfile->srch_inf.ntwrk_buf_start = NULL;
+ if (cfile->srch_inf.smallBuf)
+ cifs_small_buf_release(buf);
+ else
+ cifs_buf_release(buf);
}
+
+ cifs_put_tlink(cfile->tlink);
+ kfree(file->private_data);
+ file->private_data = NULL;
/* BB can we lock the filestruct while this is going on? */
FreeXid(xid);
return rc;
}
+
loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
{
/*
diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 5de03ec..fbc4374 100644
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -69,7 +69,7 @@ static inline void dump_cifs_file_struct(struct file *file,
char *label)
* Find the dentry that matches "name". If there isn't one, create one. If it's
* a negative dentry or the uniqueid changed, then drop it and recreate it.
*/
-static struct dentry *
+struct dentry *
cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
struct cifs_fattr *fattr)
{
@@ -465,7 +465,7 @@ static int cifs_entry_is_dot(struct cifs_dirent *de, bool
is_unicode)
/* 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)
+int is_dir_changed(struct file *file)
{
struct inode *inode = file->f_path.dentry->d_inode;
struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
diff --git a/fs/cifs/smb2dir.c b/fs/cifs/smb2dir.c
index 957338c..2ae2fcd 100644
--- a/fs/cifs/smb2dir.c
+++ b/fs/cifs/smb2dir.c
@@ -36,7 +36,7 @@
#include "smb2proto.h"
const struct file_operations smb2_dir_ops = {
- .readdir = cifs_readdir,
+ .readdir = smb2_readdir,
.release = cifs_closedir,
.read = generic_read_dir,
.unlocked_ioctl = cifs_ioctl,
diff --git a/fs/cifs/smb2glob.h b/fs/cifs/smb2glob.h
index 1fe5813..55d76ad 100644
--- a/fs/cifs/smb2glob.h
+++ b/fs/cifs/smb2glob.h
@@ -31,7 +31,6 @@
#define SMB2_MIN_RCV_POOL 4
-
/*
*****************************************************************
* Except the SMB2 PDUs themselves all the
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index bbf7299..e5373da 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1451,7 +1451,7 @@ num_entries(char *bufstart, char *end_of_buf, char
**lastentry)
*/
int SMB2_query_directory(const int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid, int index,
- struct smb2_search *psrch_inf)
+ struct cifs_search_info *psrch_inf)
{
struct query_directory_req *pSMB2;
struct query_directory_rsp *pSMB2r = NULL;
@@ -1526,24 +1526,24 @@ int SMB2_query_directory(const int xid, struct
cifs_tcon *tcon,
(char *)&pSMB2r->hdr + le16_to_cpu(pSMB2r->OutputBufferOffset);
end_of_smb = be32_to_cpu(pSMB2r->hdr.smb2_buf_length) +
4 /* RFC1001len field */ + (char *)&pSMB2r->hdr;
- psrch_inf->entries_in_buf = num_entries(psrch_inf->srch_entries_start,
- end_of_smb,
- &psrch_inf->last_entry);
- psrch_inf->index_of_last_entry += psrch_inf->entries_in_buf;
+ psrch_inf->entries_in_buffer =
+ num_entries(psrch_inf->srch_entries_start, end_of_smb,
+ &psrch_inf->last_entry);
+ psrch_inf->index_of_last_entry += psrch_inf->entries_in_buffer;
cFYI(1, "num entries %d last_index %lld srch start %p srch end %p",
- psrch_inf->entries_in_buf, psrch_inf->index_of_last_entry,
+ psrch_inf->entries_in_buffer, psrch_inf->index_of_last_entry,
psrch_inf->srch_entries_start, psrch_inf->last_entry);
if (resp_buftype == CIFS_LARGE_BUFFER)
- psrch_inf->small_buf = false;
+ psrch_inf->smallBuf = false;
else if (resp_buftype == CIFS_SMALL_BUFFER)
- psrch_inf->small_buf = true;
+ psrch_inf->smallBuf = true;
else
cERROR(1, "illegal search buffer type");
if (le32_to_cpu(pSMB2r->hdr.Status) == STATUS_NO_MORE_FILES)
- psrch_inf->search_end = 1;
+ psrch_inf->endOfSearch = 1;
else
- psrch_inf->search_end = 0;
+ psrch_inf->endOfSearch = 0;
return rc;
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 5782a10..edc8c3b 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -155,6 +155,8 @@ extern int smb2_mkdir(struct inode *inode, struct dentry
*direntry, int mode);
extern int smb2_rmdir(struct inode *inode, struct dentry *direntry);
extern int smb2_unlink(struct inode *dir, struct dentry *dentry);
+extern int smb2_readdir(struct file *file, void *direntry, filldir_t filldir);
+
/* extern char *smb2_compose_mount_options(const char *sb_mountdata,
const char *fullpath, const struct dfs_info3_param *ref,
char **devname);
@@ -192,8 +194,9 @@ extern int SMB2_oplock_break(struct cifs_tcon *ptcon, __u64
netfid);
extern int SMB2_query_info(const int xid, struct cifs_tcon *tcon,
u64 persistent_file_id, u64 volatile_file_id,
FILE_ALL_INFO_SMB2 *pFindData);
-int SMB2_query_directory(const int xid, struct cifs_tcon *tcon,
- u64 persistent_fid, u64 volatile_fid, int index, struct smb2_search *);
+extern int SMB2_query_directory(const int xid, struct cifs_tcon *tcon,
+ u64 persistent_fid, u64 volatile_fid,
+ int index, struct cifs_search_info *);
extern int SMB2_set_info(const int xid, struct cifs_tcon *tcon,
u64 persistent_file_id, u64 volatile_file_id,
FILE_BASIC_INFO *pFindData);
diff --git a/fs/cifs/smb2readdir.c b/fs/cifs/smb2readdir.c
new file mode 100644
index 0000000..9598cf8
--- /dev/null
+++ b/fs/cifs/smb2readdir.c
@@ -0,0 +1,591 @@
+/*
+ * fs/cifs/smb2readdir.c
+ *
+ * Directory search handling
+ *
+ * Copyright (C) International Business Machines Corp., 2004, 2010
+ * Author(s): Steve French ([email protected])
+ *
+ * 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/pagemap.h>
+#include <linux/stat.h>
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_unicode.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include "cifsfs.h"
+#include "smb2glob.h"
+#include "smb2pdu.h"
+#include "smb2proto.h"
+
+/*
+ * 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.
+ */
+#define UNICODE_NAME_MAX ((4 * NAME_MAX) + 2)
+
+#define UNICODE_DOT cpu_to_le16('.')
+
+/* return 0 if no match and 1 for . (current directory) and 2 for .. (parent)
*/
+static int smb2_entry_is_dot(char *current_entry, struct cifsFileInfo *sfile)
+{
+ int rc = 0;
+ char *filename = NULL;
+ int len = 0;
+
+ struct file_full_directory_info *pFindData =
+ (struct file_full_directory_info *)current_entry;
+ filename = &pFindData->filename[0];
+ len = le32_to_cpu(pFindData->filename_length);
+ cFYI(1, "filename len of entry %d", len);
+ if (filename) {
+ __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;
+ }
+ }
+
+ return rc;
+}
+
+static char *nxt_dir_entry(char *old_entry, char *end_of_smb)
+{
+ char *new_entry;
+ struct file_full_directory_info *pDirInfo =
+ (struct file_full_directory_info *)old_entry;
+
+ new_entry = old_entry + le32_to_cpu(pDirInfo->next_entry_offset);
+
+ 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;
+ }
+
+ return new_entry;
+}
+
+static int smb2_save_resume_key(const char *current_entry,
+ struct cifsFileInfo *smb2file)
+{
+ int rc = 0;
+ unsigned int len = 0;
+ char *filename;
+ struct file_full_directory_info *pFindData;
+
+ if ((smb2file == NULL) || (current_entry == NULL))
+ return -EINVAL;
+
+ pFindData = (struct file_full_directory_info *)current_entry;
+
+ filename = &pFindData->filename[0];
+ len = le32_to_cpu(pFindData->filename_length);
+
+ if (len > SMB2_MAX_MSGSIZE)
+ return -EINVAL;
+
+ smb2file->srch_inf.resume_key = pFindData->file_index;
+ smb2file->srch_inf.resume_name_len = len;
+ smb2file->srch_inf.presume_name = filename;
+ return rc;
+}
+
+/* inode num, inode type and filename returned */
+static int smb2_get_name_from_search_buf(struct qstr *pqst,
+ char *current_entry,
+ struct cifs_sb_info *smb2_sb, unsigned int max_len, __u64 *pinum)
+{
+ int rc = 0;
+ unsigned int len = 0;
+ char *filename;
+ struct nls_table *nlt = smb2_sb->local_nls;
+ struct file_full_directory_info *pfinddata;
+
+ *pinum = 0;
+
+ pfinddata = (struct file_full_directory_info *)current_entry;
+
+ filename = &pfinddata->filename[0];
+ len = le32_to_cpu(pfinddata->filename_length);
+ cFYI(1, "find in search buf entry of length %d", len);
+ if (len > max_len) {
+ cERROR(1, "bad search response length %d past smb end", len);
+ return -EINVAL;
+ }
+
+ /* cifs_dump_mem("search entry filename: ", filename, len); */
+
+ pqst->len = cifs_from_ucs2((char *) pqst->name,
+ (__le16 *) filename,
+ UNICODE_NAME_MAX,
+ min(len, max_len), nlt,
+ smb2_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
+
+ pqst->hash = full_name_hash(pqst->name, pqst->len);
+ cFYI(1, "filldir on %s of len %d", pqst->name, pqst->len);
+ return rc;
+}
+
+static void
+smb2_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *smb2_sb)
+{
+ fattr->cf_uid = smb2_sb->mnt_uid;
+ fattr->cf_gid = smb2_sb->mnt_gid;
+
+ if (fattr->cf_cifsattrs & FILE_ATTRIBUTE_DIRECTORY) {
+ fattr->cf_mode = S_IFDIR | smb2_sb->mnt_dir_mode;
+ fattr->cf_dtype = DT_DIR;
+ } else {
+ fattr->cf_mode = S_IFREG | smb2_sb->mnt_file_mode;
+ fattr->cf_dtype = DT_REG;
+ }
+
+ if (fattr->cf_cifsattrs & FILE_ATTRIBUTE_READONLY)
+ fattr->cf_mode &= ~S_IWUGO;
+}
+
+static void
+smb2_dir_info_to_fattr(struct cifs_fattr *fattr,
+ struct file_full_directory_info *info,
+ struct cifs_sb_info *smb2_sb)
+{
+ memset(fattr, 0, sizeof(*fattr));
+ fattr->cf_cifsattrs = le32_to_cpu(info->file_attribute);
+ fattr->cf_eof = le64_to_cpu(info->end_of_file);
+ fattr->cf_bytes = le64_to_cpu(info->allocation_size);
+ fattr->cf_atime = cifs_NTtimeToUnix(info->last_access_time);
+ fattr->cf_ctime = cifs_NTtimeToUnix(info->change_time);
+ fattr->cf_mtime = cifs_NTtimeToUnix(info->last_write_time);
+ cFYI(1, "eof: %lld alloc_size %lld", fattr->cf_eof, fattr->cf_bytes);
+
+ smb2_fill_common_info(fattr, smb2_sb);
+}
+
+/*
+ * 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.
+ */
+
+static int smb2_filldir(char *pfindEntry, struct file *file, filldir_t filldir,
+ void *direntry, char *scratch_buf, unsigned int max_len)
+{
+ int rc = 0;
+ struct qstr qstring;
+ struct cifsFileInfo *psmb2f;
+ u64 inum;
+ ino_t ino;
+ struct super_block *sb;
+ struct cifs_sb_info *smb2_sb;
+ struct dentry *tmp_dentry;
+ struct cifs_fattr fattr;
+
+ /* get filename and len into qstring */
+ /* get dentry */
+ /* decide whether to create and populate inode */
+ if ((direntry == NULL) || (file == NULL))
+ return -EINVAL;
+
+ psmb2f = file->private_data;
+
+ if ((scratch_buf == NULL) || (pfindEntry == NULL) || (psmb2f == NULL))
+ return -ENOENT;
+
+ rc = smb2_entry_is_dot(pfindEntry, psmb2f);
+ /* skip . and .. since we added them first */
+ if (rc != 0)
+ return 0;
+
+ sb = file->f_path.dentry->d_sb;
+ smb2_sb = CIFS_SB(sb);
+
+ qstring.name = scratch_buf;
+ rc = smb2_get_name_from_search_buf(&qstring, pfindEntry,
+ smb2_sb, max_len, &inum /* returned */);
+
+ if (rc)
+ return rc;
+
+ smb2_dir_info_to_fattr(&fattr, (struct file_full_directory_info *)
+ pfindEntry, smb2_sb);
+
+ if (inum)
+ fattr.cf_uniqueid = inum;
+ else
+ fattr.cf_uniqueid = iunique(sb, ROOT_I);
+
+ ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
+ tmp_dentry = cifs_readdir_lookup(file->f_dentry, &qstring, &fattr);
+
+ rc = filldir(direntry, qstring.name, qstring.len, file->f_pos,
+ ino, fattr.cf_dtype);
+
+ /*
+ * we can not return filldir errors to the caller since they are
+ * "normal" when the stat blocksize is too small - we return remapped
+ * error instead
+ *
+ * FIXME: This looks bogus. filldir returns -EOVERFLOW in the above
+ * case already. Why should we be clobbering other errors from it?
+ */
+ if (rc) {
+ cFYI(1, "filldir rc = %d", rc);
+ rc = -EOVERFLOW;
+ }
+ dput(tmp_dentry);
+ return rc;
+}
+
+static int initiate_smb2_search(const int xid, struct file *file);
+
+/* 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_smb2_entry(const int xid, struct cifs_tcon *tcon,
+ struct file *file, char **ppcurrent_entry, 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 *smb2file = file->private_data;
+ /* check if index in the buffer */
+
+ if ((smb2file == NULL) || (ppcurrent_entry == NULL) ||
+ (num_to_ret == NULL))
+ return -ENOENT;
+
+ *ppcurrent_entry = NULL;
+ first_entry_in_buffer =
+ smb2file->srch_inf.index_of_last_entry -
+ smb2file->srch_inf.entries_in_buffer;
+
+ /*
+ * if first entry in buf is zero then is first buffer
+ * in search response data which means it is likely . and ..
+ * will be in this buffer, although some servers do not return
+ * . and .. for the root of a drive and for those we need
+ * to start two entries earlier.
+ */
+
+ if (((index_to_find < smb2file->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");
+ spin_lock(&cifs_tcp_ses_lock);
+ if (!smb2file->srch_inf.endOfSearch &&
+ !smb2file->invalidHandle) {
+ smb2file->invalidHandle = true;
+ spin_unlock(&cifs_tcp_ses_lock);
+ SMB2_close(xid, tcon, smb2file->persist_fid,
smb2file->volatile_fid);
+ } else
+ spin_unlock(&cifs_tcp_ses_lock);
+ if (smb2file->srch_inf.ntwrk_buf_start) {
+ cFYI(1, "freeing SMB ff cache buf on search rewind");
+ if (smb2file->srch_inf.smallBuf)
+ cifs_small_buf_release(smb2file->srch_inf.
+ ntwrk_buf_start);
+ else
+ cifs_buf_release(smb2file->srch_inf.
+ ntwrk_buf_start);
+ smb2file->srch_inf.ntwrk_buf_start = NULL;
+ }
+ rc = initiate_smb2_search(xid, file);
+ if (rc) {
+ cFYI(1, "error %d reinitiating a search on rewind",
+ rc);
+ return rc;
+ }
+ smb2_save_resume_key(smb2file->srch_inf.last_entry, smb2file);
+ }
+
+
+ while ((index_to_find >= smb2file->srch_inf.index_of_last_entry) &&
+ (rc == 0) && !smb2file->srch_inf.endOfSearch) {
+ cFYI(1, "calling findnext2");
+ rc = SMB2_query_directory(xid, tcon, smb2file->persist_fid,
+ smb2file->volatile_fid, 0,
+ &smb2file->srch_inf);
+ smb2_save_resume_key(smb2file->srch_inf.last_entry, smb2file);
+ if (rc)
+ return -ENOENT;
+ }
+ cFYI(1, "index to find %lld last %lld", index_to_find,
+ smb2file->srch_inf.index_of_last_entry);
+
+ if (index_to_find < smb2file->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 = smb2file->srch_inf.ntwrk_buf_start +
+ smb2_calc_size((struct smb2_hdr *)
+ smb2file->srch_inf.ntwrk_buf_start);
+ current_entry = smb2file->srch_inf.srch_entries_start;
+ first_entry_in_buffer = smb2file->srch_inf.index_of_last_entry
+ - smb2file->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);
+
+ for (i = 0;
+ (i < (pos_in_buf)) && (current_entry != NULL); i++) {
+ /* go entry by entry figuring out which is first */
+ 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;
+ *ppcurrent_entry = current_entry;
+ } else {
+ cFYI(1, "index not in buffer - could not findnext into it");
+ return 0;
+ }
+
+ if (pos_in_buf >= smb2file->srch_inf.entries_in_buffer) {
+ cFYI(1, "can not return entries pos_in_buf beyond last");
+ *num_to_ret = 0;
+ } else
+ *num_to_ret = smb2file->srch_inf.entries_in_buffer - pos_in_buf;
+
+ return rc;
+}
+
+static int initiate_smb2_search(const int xid, struct file *file)
+{
+ int rc = 0;
+ __le16 *full_path;
+ struct cifsFileInfo *smb2_file;
+ struct cifs_sb_info *smb2_sb;
+ struct cifs_tcon *tcon;
+ struct tcon_link *tlink;
+ u64 persistent_fid, volatile_fid;
+
+ smb2_sb = CIFS_SB(file->f_path.dentry->d_sb);
+ tlink = cifs_sb_tlink(smb2_sb);
+ if (IS_ERR(tlink)) {
+ FreeXid(xid);
+ return PTR_ERR(tlink);
+ }
+ tcon = tlink_tcon(tlink);
+
+ full_path = build_ucspath_from_dentry(file->f_path.dentry);
+ if (full_path == NULL)
+ return -ENOMEM;
+
+ rc = SMB2_open(xid, tcon, full_path, &persistent_fid, &volatile_fid,
+ FILE_READ_ATTRIBUTES | FILE_READ_DATA, FILE_OPEN, 0, 0);
+ if (rc) {
+ cERROR(1, "open of dir failed before readdir with rc = %d", rc);
+ goto initiate_search_exit;
+ }
+
+ if (file->private_data == NULL)
+ file->private_data =
+ kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
+
+ if (file->private_data == NULL) {
+ rc = -ENOMEM;
+ goto initiate_search_exit;
+ }
+
+ smb2_file = file->private_data;
+ smb2_file->srch_inf.entries_in_buffer = 0;
+ smb2_file->srch_inf.index_of_last_entry = 0;
+ smb2_file->persist_fid = persistent_fid;
+ smb2_file->volatile_fid = volatile_fid;
+ smb2_file->invalidHandle = false;
+ smb2_file->tlink = cifs_get_tlink(tlink);
+ mutex_init(&smb2_file->fh_mutex);
+ INIT_WORK(&smb2_file->oplock_break, cifs_oplock_break);
+ smb2_file->count = 1;
+
+ rc = SMB2_query_directory(xid, tcon, persistent_fid, volatile_fid,
+ 0 /* index */, &smb2_file->srch_inf);
+ if (rc)
+ cERROR(1, "query of dir failed");
+
+ /*
+ * BB add following call to handle readdir on new NTFS symlink errors
+ if (rc == cpu_to_le32(STATUS_STOPPED_ON_SYMLINK))
+ call get_symlink_reparse_path and retry with new path
+ */
+
+initiate_search_exit:
+ kfree(full_path);
+ cifs_put_tlink(tlink);
+ return rc;
+}
+
+
+int smb2_readdir(struct file *file, void *direntry, filldir_t filldir)
+{
+ int rc = 0;
+ int xid;
+ int i;
+ struct cifs_sb_info *smb2_sb;
+ struct cifs_tcon *tcon;
+ struct tcon_link *tlink;
+ struct cifsFileInfo *smb2_file = NULL;
+ int num_to_fill = 0;
+ char *tmp_buf = NULL;
+ char *end_of_smb;
+ unsigned int max_len;
+ char *current_entry;
+
+ xid = GetXid();
+
+ cFYI(1, "readdir on pos %d", (int) file->f_pos);
+ switch ((int) file->f_pos) {
+ case 0:
+ if (filldir(direntry, ".", 1, file->f_pos,
+ file->f_path.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,
+ parent_ino(file->f_path.dentry), DT_DIR) < 0) {
+ cERROR(1, "Filldir for parent dir failed");
+ rc = -ENOMEM;
+ break;
+ }
+ file->f_pos++;
+ default:
+ /*
+ * 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_smb2_search(xid, file);
+ cFYI(1, "initiate smb2 search rc %d", rc);
+ if (rc)
+ goto rddir2_exit;
+ }
+ if (file->private_data == NULL) {
+ rc = -EINVAL;
+ goto rddir2_exit;
+ }
+ smb2_file = file->private_data;
+ if (smb2_file->srch_inf.endOfSearch) {
+ if (smb2_file->srch_inf.emptyDir) {
+ cFYI(1, "End of search, empty dir");
+ rc = 0;
+ break;
+ }
+ }
+
+ smb2_sb = CIFS_SB(file->f_path.dentry->d_sb);
+ tlink = cifs_sb_tlink(smb2_sb);
+ if (IS_ERR(tlink)) {
+ FreeXid(xid);
+ return PTR_ERR(tlink);
+ }
+ tcon = tlink_tcon(tlink);
+
+ rc = find_smb2_entry(xid, tcon, file, ¤t_entry,
+ &num_to_fill);
+ cifs_put_tlink(tlink);
+
+ if (rc) {
+ cFYI(1, "find smb2 entry error %d", rc);
+ goto rddir2_exit;
+ } else if (current_entry != NULL) {
+ cFYI(1, "found entry %lld", file->f_pos);
+ } else {
+ cFYI(1, "could not find dir entry");
+ goto rddir2_exit;
+ }
+ cFYI(1, "loop through %d times filling dir with buf %p",
+ num_to_fill, smb2_file->srch_inf.ntwrk_buf_start);
+
+ max_len = smb2_calc_size((struct smb2_hdr *)
+ smb2_file->srch_inf.ntwrk_buf_start);
+ end_of_smb = smb2_file->srch_inf.ntwrk_buf_start + max_len;
+
+ tmp_buf = kmalloc(UNICODE_NAME_MAX, GFP_KERNEL);
+ if (tmp_buf == NULL) {
+ rc = -ENOMEM;
+ break;
+ }
+
+ for (i = 0; (i < num_to_fill) && (rc == 0); i++) {
+ if (current_entry == NULL) {
+ /* evaluate whether this case is an error */
+ cERROR(1, "past SMB end, num to fill %d i %d",
+ num_to_fill, i);
+ break;
+ }
+ /*
+ * if buggy server returns . and .. late do
+ * we want to check for that here?
+ */
+ rc = smb2_filldir(current_entry, file,
+ filldir, direntry, tmp_buf, max_len);
+ if (rc == -EOVERFLOW) {
+ rc = 0;
+ break;
+ }
+
+ file->f_pos++;
+ if (file->f_pos ==
+ smb2_file->srch_inf.index_of_last_entry) {
+ cFYI(1, "last entry in buf at pos %lld %s",
+ file->f_pos, tmp_buf);
+ smb2_save_resume_key(current_entry, smb2_file);
+ break;
+ } else
+ current_entry =
+ nxt_dir_entry(current_entry, end_of_smb);
+ }
+ kfree(tmp_buf);
+ break;
+ } /* end switch */
+
+rddir2_exit:
+ FreeXid(xid);
+ return rc;
+}
--
1.7.1
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