[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/cifs/readdir.c b/ap/os/linux/linux-3.4.x/fs/cifs/readdir.c
new file mode 100644
index 0000000..6406ac9
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/cifs/readdir.c
@@ -0,0 +1,853 @@
+/*
+ * fs/cifs/readdir.c
+ *
+ * Directory search handling
+ *
+ * Copyright (C) International Business Machines Corp., 2004, 2008
+ * Copyright (C) Red Hat, Inc., 2011
+ * 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/pagemap.h>
+#include <linux/slab.h>
+#include <linux/stat.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"
+
+/*
+ * 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)
+
+#ifdef CONFIG_CIFS_DEBUG2
+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");
+ }
+}
+#else
+static inline void dump_cifs_file_struct(struct file *file, char *label)
+{
+}
+#endif /* DEBUG2 */
+
+/*
+ * 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 *
+cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
+ struct cifs_fattr *fattr)
+{
+ struct dentry *dentry, *alias;
+ struct inode *inode;
+ struct super_block *sb = parent->d_inode->i_sb;
+
+ cFYI(1, "For %s", name->name);
+
+ if (parent->d_op && parent->d_op->d_hash)
+ parent->d_op->d_hash(parent, parent->d_inode, name);
+ else
+ name->hash = full_name_hash(name->name, name->len);
+
+ dentry = d_lookup(parent, name);
+ if (dentry) {
+ inode = dentry->d_inode;
+ /* update inode in place if i_ino didn't change */
+ if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
+ cifs_fattr_to_inode(inode, fattr);
+ return dentry;
+ }
+ d_drop(dentry);
+ dput(dentry);
+ }
+
+ /*
+ * If we know that the inode will need to be revalidated immediately,
+ * then don't create a new dentry for it. We'll end up doing an on
+ * the wire call either way and this spares us an invalidation.
+ */
+ if (fattr->cf_flags & CIFS_FATTR_NEED_REVAL)
+ return NULL;
+
+ dentry = d_alloc(parent, name);
+ if (dentry == NULL)
+ return NULL;
+
+ inode = cifs_iget(sb, fattr);
+ if (!inode) {
+ dput(dentry);
+ return NULL;
+ }
+
+ alias = d_materialise_unique(dentry, inode);
+ if (alias != NULL) {
+ dput(dentry);
+ if (IS_ERR(alias))
+ return NULL;
+ dentry = alias;
+ }
+
+ return dentry;
+}
+
+static void
+cifs_fill_common_info(struct cifs_fattr *fattr, struct cifs_sb_info *cifs_sb)
+{
+ fattr->cf_uid = cifs_sb->mnt_uid;
+ fattr->cf_gid = cifs_sb->mnt_gid;
+
+ if (fattr->cf_cifsattrs & ATTR_DIRECTORY) {
+ fattr->cf_mode = S_IFDIR | cifs_sb->mnt_dir_mode;
+ fattr->cf_dtype = DT_DIR;
+ } else {
+ fattr->cf_mode = S_IFREG | cifs_sb->mnt_file_mode;
+ fattr->cf_dtype = DT_REG;
+ }
+
+ if (fattr->cf_cifsattrs & ATTR_READONLY)
+ fattr->cf_mode &= ~S_IWUGO;
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL &&
+ fattr->cf_cifsattrs & ATTR_SYSTEM) {
+ if (fattr->cf_eof == 0) {
+ fattr->cf_mode &= ~S_IFMT;
+ fattr->cf_mode |= S_IFIFO;
+ fattr->cf_dtype = DT_FIFO;
+ } else {
+ /*
+ * trying to get the type and mode via SFU can be slow,
+ * so just call those regular files for now, and mark
+ * for reval
+ */
+ fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
+ }
+ }
+}
+
+static void
+cifs_dir_info_to_fattr(struct cifs_fattr *fattr, FILE_DIRECTORY_INFO *info,
+ struct cifs_sb_info *cifs_sb)
+{
+ memset(fattr, 0, sizeof(*fattr));
+ fattr->cf_cifsattrs = le32_to_cpu(info->ExtFileAttributes);
+ fattr->cf_eof = le64_to_cpu(info->EndOfFile);
+ fattr->cf_bytes = le64_to_cpu(info->AllocationSize);
+ fattr->cf_createtime = le64_to_cpu(info->CreationTime);
+ fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
+ fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
+ fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
+
+ cifs_fill_common_info(fattr, cifs_sb);
+}
+
+static void
+cifs_std_info_to_fattr(struct cifs_fattr *fattr, FIND_FILE_STANDARD_INFO *info,
+ struct cifs_sb_info *cifs_sb)
+{
+ int offset = cifs_sb_master_tcon(cifs_sb)->ses->server->timeAdj;
+
+ memset(fattr, 0, sizeof(*fattr));
+ fattr->cf_atime = cnvrtDosUnixTm(info->LastAccessDate,
+ info->LastAccessTime, offset);
+ fattr->cf_ctime = cnvrtDosUnixTm(info->LastWriteDate,
+ info->LastWriteTime, offset);
+ fattr->cf_mtime = cnvrtDosUnixTm(info->LastWriteDate,
+ info->LastWriteTime, offset);
+
+ fattr->cf_cifsattrs = le16_to_cpu(info->Attributes);
+ fattr->cf_bytes = le32_to_cpu(info->AllocationSize);
+ fattr->cf_eof = le32_to_cpu(info->DataSize);
+
+ cifs_fill_common_info(fattr, cifs_sb);
+}
+
+/* BB eventually need to add the following helper function to
+ resolve NT_STATUS_STOPPED_ON_SYMLINK return code when
+ we try to do FindFirst on (NTFS) directory symlinks */
+/*
+int get_symlink_reparse_path(char *full_path, struct cifs_sb_info *cifs_sb,
+ int xid)
+{
+ __u16 fid;
+ int len;
+ int oplock = 0;
+ int rc;
+ struct cifs_tcon *ptcon = cifs_sb_tcon(cifs_sb);
+ char *tmpbuffer;
+
+ rc = CIFSSMBOpen(xid, ptcon, full_path, FILE_OPEN, GENERIC_READ,
+ OPEN_REPARSE_POINT, &fid, &oplock, NULL,
+ cifs_sb->local_nls,
+ cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
+ if (!rc) {
+ tmpbuffer = kmalloc(maxpath);
+ rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
+ tmpbuffer,
+ maxpath -1,
+ fid,
+ cifs_sb->local_nls);
+ if (CIFSSMBClose(xid, ptcon, fid)) {
+ cFYI(1, "Error closing temporary reparsepoint open");
+ }
+ }
+}
+ */
+
+static int initiate_cifs_search(const int xid, struct file *file)
+{
+ __u16 search_flags;
+ int rc = 0;
+ char *full_path = NULL;
+ struct cifsFileInfo *cifsFile;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
+ struct tcon_link *tlink = NULL;
+ struct cifs_tcon *pTcon;
+
+ if (file->private_data == NULL) {
+ tlink = cifs_sb_tlink(cifs_sb);
+ if (IS_ERR(tlink))
+ return PTR_ERR(tlink);
+
+ cifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
+ if (cifsFile == NULL) {
+ rc = -ENOMEM;
+ goto error_exit;
+ }
+ file->private_data = cifsFile;
+ cifsFile->tlink = cifs_get_tlink(tlink);
+ pTcon = tlink_tcon(tlink);
+ } else {
+ cifsFile = file->private_data;
+ pTcon = tlink_tcon(cifsFile->tlink);
+ }
+
+ cifsFile->invalidHandle = true;
+ cifsFile->srch_inf.endOfSearch = false;
+
+ full_path = build_path_from_dentry(file->f_path.dentry);
+ if (full_path == NULL) {
+ rc = -ENOMEM;
+ goto error_exit;
+ }
+
+ cFYI(1, "Full path: %s start at: %lld", full_path, file->f_pos);
+
+ffirst_retry:
+ /* test for Unix extensions */
+ /* but now check for them on the share/mount not on the SMB session */
+/* if (pTcon->ses->capabilities & CAP_UNIX) { */
+ if (pTcon->unix_ext)
+ cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
+ else if ((pTcon->ses->capabilities &
+ (CAP_NT_SMBS | CAP_NT_FIND)) == 0) {
+ cifsFile->srch_inf.info_level = SMB_FIND_FILE_INFO_STANDARD;
+ } 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;
+ }
+
+ search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
+ if (backup_cred(cifs_sb))
+ search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
+
+ rc = CIFSFindFirst(xid, pTcon, full_path, cifs_sb->local_nls,
+ &cifsFile->netfid, search_flags, &cifsFile->srch_inf,
+ cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR, CIFS_DIR_SEP(cifs_sb));
+ if (rc == 0)
+ cifsFile->invalidHandle = false;
+ /* BB add following call to handle readdir on new NTFS symlink errors
+ else if STATUS_STOPPED_ON_SYMLINK
+ call get_symlink_reparse_path and retry with new path */
+ else if ((rc == -EOPNOTSUPP) &&
+ (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
+ cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
+ goto ffirst_retry;
+ }
+error_exit:
+ kfree(full_path);
+ cifs_put_tlink(tlink);
+ return rc;
+}
+
+/* return length of unicode string in bytes */
+static int cifs_unicode_bytelen(const char *str)
+{
+ int len;
+ const __le16 *ustr = (const __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, int level)
+{
+ char *new_entry;
+ FILE_DIRECTORY_INFO *pDirInfo = (FILE_DIRECTORY_INFO *)old_entry;
+
+ if (level == SMB_FIND_FILE_INFO_STANDARD) {
+ FIND_FILE_STANDARD_INFO *pfData;
+ pfData = (FIND_FILE_STANDARD_INFO *)pDirInfo;
+
+ new_entry = old_entry + sizeof(FIND_FILE_STANDARD_INFO) +
+ pfData->FileNameLength;
+ } else
+ 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 (((level == SMB_FIND_FILE_INFO_STANDARD) &&
+ (new_entry + sizeof(FIND_FILE_STANDARD_INFO) > end_of_smb))
+ || ((level != SMB_FIND_FILE_INFO_STANDARD) &&
+ (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;
+
+}
+
+struct cifs_dirent {
+ const char *name;
+ size_t namelen;
+ u32 resume_key;
+ u64 ino;
+};
+
+static void cifs_fill_dirent_unix(struct cifs_dirent *de,
+ const FILE_UNIX_INFO *info, bool is_unicode)
+{
+ de->name = &info->FileName[0];
+ if (is_unicode)
+ de->namelen = cifs_unicode_bytelen(de->name);
+ else
+ de->namelen = strnlen(de->name, PATH_MAX);
+ de->resume_key = info->ResumeKey;
+ de->ino = le64_to_cpu(info->basic.UniqueId);
+}
+
+static void cifs_fill_dirent_dir(struct cifs_dirent *de,
+ const FILE_DIRECTORY_INFO *info)
+{
+ de->name = &info->FileName[0];
+ de->namelen = le32_to_cpu(info->FileNameLength);
+ de->resume_key = info->FileIndex;
+}
+
+static void cifs_fill_dirent_full(struct cifs_dirent *de,
+ const FILE_FULL_DIRECTORY_INFO *info)
+{
+ de->name = &info->FileName[0];
+ de->namelen = le32_to_cpu(info->FileNameLength);
+ de->resume_key = info->FileIndex;
+}
+
+static void cifs_fill_dirent_search(struct cifs_dirent *de,
+ const SEARCH_ID_FULL_DIR_INFO *info)
+{
+ de->name = &info->FileName[0];
+ de->namelen = le32_to_cpu(info->FileNameLength);
+ de->resume_key = info->FileIndex;
+ de->ino = le64_to_cpu(info->UniqueId);
+}
+
+static void cifs_fill_dirent_both(struct cifs_dirent *de,
+ const FILE_BOTH_DIRECTORY_INFO *info)
+{
+ de->name = &info->FileName[0];
+ de->namelen = le32_to_cpu(info->FileNameLength);
+ de->resume_key = info->FileIndex;
+}
+
+static void cifs_fill_dirent_std(struct cifs_dirent *de,
+ const FIND_FILE_STANDARD_INFO *info)
+{
+ de->name = &info->FileName[0];
+ /* one byte length, no endianess conversion */
+ de->namelen = info->FileNameLength;
+ de->resume_key = info->ResumeKey;
+}
+
+static int cifs_fill_dirent(struct cifs_dirent *de, const void *info,
+ u16 level, bool is_unicode)
+{
+ memset(de, 0, sizeof(*de));
+
+ switch (level) {
+ case SMB_FIND_FILE_UNIX:
+ cifs_fill_dirent_unix(de, info, is_unicode);
+ break;
+ case SMB_FIND_FILE_DIRECTORY_INFO:
+ cifs_fill_dirent_dir(de, info);
+ break;
+ case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
+ cifs_fill_dirent_full(de, info);
+ break;
+ case SMB_FIND_FILE_ID_FULL_DIR_INFO:
+ cifs_fill_dirent_search(de, info);
+ break;
+ case SMB_FIND_FILE_BOTH_DIRECTORY_INFO:
+ cifs_fill_dirent_both(de, info);
+ break;
+ case SMB_FIND_FILE_INFO_STANDARD:
+ cifs_fill_dirent_std(de, info);
+ break;
+ default:
+ cFYI(1, "Unknown findfirst level %d", level);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+#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(struct cifs_dirent *de, bool is_unicode)
+{
+ int rc = 0;
+
+ if (!de->name)
+ return 0;
+
+ if (is_unicode) {
+ __le16 *ufilename = (__le16 *)de->name;
+ if (de->namelen == 2) {
+ /* check for . */
+ if (ufilename[0] == UNICODE_DOT)
+ rc = 1;
+ } else if (de->namelen == 4) {
+ /* check for .. */
+ if (ufilename[0] == UNICODE_DOT &&
+ ufilename[1] == UNICODE_DOT)
+ rc = 2;
+ }
+ } else /* ASCII */ {
+ if (de->namelen == 1) {
+ if (de->name[0] == '.')
+ rc = 1;
+ } else if (de->namelen == 2) {
+ if (de->name[0] == '.' && de->name[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 = file->f_path.dentry->d_inode;
+ struct cifsInodeInfo *cifsInfo = CIFS_I(inode);
+
+ if (cifsInfo->time == 0)
+ return 1; /* directory was changed, perhaps due to unlink */
+ else
+ return 0;
+
+}
+
+static int cifs_save_resume_key(const char *current_entry,
+ struct cifsFileInfo *file_info)
+{
+ struct cifs_dirent de;
+ int rc;
+
+ rc = cifs_fill_dirent(&de, current_entry, file_info->srch_inf.info_level,
+ file_info->srch_inf.unicode);
+ if (!rc) {
+ file_info->srch_inf.presume_name = de.name;
+ file_info->srch_inf.resume_name_len = de.namelen;
+ file_info->srch_inf.resume_key = de.resume_key;
+ }
+ return rc;
+}
+
+/* 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 cifs_tcon *pTcon,
+ struct file *file, char **ppCurrentEntry, int *num_to_ret)
+{
+ __u16 search_flags;
+ 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;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
+ /* 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;
+
+ /* 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 */
+
+ 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");
+ spin_lock(&cifs_file_list_lock);
+ if (!cifsFile->srch_inf.endOfSearch &&
+ !cifsFile->invalidHandle) {
+ cifsFile->invalidHandle = true;
+ spin_unlock(&cifs_file_list_lock);
+ CIFSFindClose(xid, pTcon, cifsFile->netfid);
+ } else
+ spin_unlock(&cifs_file_list_lock);
+ if (cifsFile->srch_inf.ntwrk_buf_start) {
+ cFYI(1, "freeing SMB ff cache buf on search rewind");
+ if (cifsFile->srch_inf.smallBuf)
+ cifs_small_buf_release(cifsFile->srch_inf.
+ ntwrk_buf_start);
+ else
+ cifs_buf_release(cifsFile->srch_inf.
+ ntwrk_buf_start);
+ cifsFile->srch_inf.ntwrk_buf_start = NULL;
+ }
+ rc = initiate_cifs_search(xid, file);
+ if (rc) {
+ cFYI(1, "error %d reinitiating a search on rewind",
+ rc);
+ return rc;
+ }
+ /* FindFirst/Next set last_entry to NULL on malformed reply */
+ if (cifsFile->srch_inf.last_entry)
+ cifs_save_resume_key(cifsFile->srch_inf.last_entry,
+ cifsFile);
+ }
+
+ search_flags = CIFS_SEARCH_CLOSE_AT_END | CIFS_SEARCH_RETURN_RESUME;
+ if (backup_cred(cifs_sb))
+ search_flags |= CIFS_SEARCH_BACKUP_SEARCH;
+
+ while ((index_to_find >= cifsFile->srch_inf.index_of_last_entry) &&
+ (rc == 0) && !cifsFile->srch_inf.endOfSearch) {
+ cFYI(1, "calling findnext2");
+ rc = CIFSFindNext(xid, pTcon, cifsFile->netfid, search_flags,
+ &cifsFile->srch_inf);
+ /* FindFirst/Next set last_entry to NULL on malformed reply */
+ if (cifsFile->srch_inf.last_entry)
+ cifs_save_resume_key(cifsFile->srch_inf.last_entry,
+ cifsFile);
+ 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);
+
+ current_entry = cifsFile->srch_inf.srch_entries_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);
+
+ 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,
+ cifsFile->srch_inf.info_level);
+ }
+ 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");
+ *num_to_ret = 0;
+ } else
+ *num_to_ret = cifsFile->srch_inf.entries_in_buffer - pos_in_buf;
+
+ return rc;
+}
+
+static int cifs_filldir(char *find_entry, struct file *file, filldir_t filldir,
+ void *dirent, char *scratch_buf, unsigned int max_len)
+{
+ struct cifsFileInfo *file_info = file->private_data;
+ struct super_block *sb = file->f_path.dentry->d_sb;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifs_dirent de = { NULL, };
+ struct cifs_fattr fattr;
+ struct dentry *dentry;
+ struct qstr name;
+ int rc = 0;
+ ino_t ino;
+
+ rc = cifs_fill_dirent(&de, find_entry, file_info->srch_inf.info_level,
+ file_info->srch_inf.unicode);
+ if (rc)
+ return rc;
+
+ if (de.namelen > max_len) {
+ cERROR(1, "bad search response length %zd past smb end",
+ de.namelen);
+ return -EINVAL;
+ }
+
+ /* skip . and .. since we added them first */
+ if (cifs_entry_is_dot(&de, file_info->srch_inf.unicode))
+ return 0;
+
+ if (file_info->srch_inf.unicode) {
+ struct nls_table *nlt = cifs_sb->local_nls;
+
+ name.name = scratch_buf;
+ name.len =
+ cifs_from_utf16((char *)name.name, (__le16 *)de.name,
+ UNICODE_NAME_MAX,
+ min_t(size_t, de.namelen,
+ (size_t)max_len), nlt,
+ cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_MAP_SPECIAL_CHR);
+ name.len -= nls_nullsize(nlt);
+ } else {
+ name.name = de.name;
+ name.len = de.namelen;
+ }
+
+ switch (file_info->srch_inf.info_level) {
+ case SMB_FIND_FILE_UNIX:
+ cifs_unix_basic_to_fattr(&fattr,
+ &((FILE_UNIX_INFO *)find_entry)->basic,
+ cifs_sb);
+ break;
+ case SMB_FIND_FILE_INFO_STANDARD:
+ cifs_std_info_to_fattr(&fattr,
+ (FIND_FILE_STANDARD_INFO *)find_entry,
+ cifs_sb);
+ break;
+ default:
+ cifs_dir_info_to_fattr(&fattr,
+ (FILE_DIRECTORY_INFO *)find_entry,
+ cifs_sb);
+ break;
+ }
+
+ if (de.ino && (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)) {
+ fattr.cf_uniqueid = de.ino;
+ } else {
+ fattr.cf_uniqueid = iunique(sb, ROOT_I);
+ cifs_autodisable_serverino(cifs_sb);
+ }
+
+ if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
+ CIFSCouldBeMFSymlink(&fattr))
+ /*
+ * trying to get the type and mode can be slow,
+ * so just call those regular files for now, and mark
+ * for reval
+ */
+ fattr.cf_flags |= CIFS_FATTR_NEED_REVAL;
+
+ ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
+ dentry = cifs_readdir_lookup(file->f_dentry, &name, &fattr);
+
+ rc = filldir(dirent, name.name, name.len, file->f_pos, ino,
+ fattr.cf_dtype);
+
+ dput(dentry);
+ return rc;
+}
+
+
+int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
+{
+ int rc = 0;
+ int xid, i;
+ struct cifs_tcon *pTcon;
+ struct cifsFileInfo *cifsFile = NULL;
+ char *current_entry;
+ int num_to_fill = 0;
+ char *tmp_buf = NULL;
+ char *end_of_smb;
+ unsigned int max_len;
+
+ xid = GetXid();
+
+ /*
+ * Ensure FindFirst doesn't fail before doing filldir() for '.' and
+ * '..'. Otherwise we won't be able to notify VFS in case of failure.
+ */
+ if (file->private_data == NULL) {
+ rc = initiate_cifs_search(xid, file);
+ cFYI(1, "initiate cifs search rc %d", rc);
+ if (rc)
+ goto rddir2_exit;
+ }
+
+ 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 = -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);
+ } */
+
+ pTcon = tlink_tcon(cifsFile->tlink);
+ rc = find_cifs_entry(xid, pTcon, file,
+ ¤t_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);
+ max_len = smbCalcSize((struct smb_hdr *)
+ cifsFile->srch_inf.ntwrk_buf_start);
+ end_of_smb = cifsFile->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 = cifs_filldir(current_entry, file,
+ filldir, direntry, tmp_buf, max_len);
+ if (rc == -EOVERFLOW) {
+ rc = 0;
+ break;
+ }
+
+ 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);
+ cifs_save_resume_key(current_entry, cifsFile);
+ break;
+ } else
+ current_entry =
+ nxt_dir_entry(current_entry, end_of_smb,
+ cifsFile->srch_inf.info_level);
+ }
+ kfree(tmp_buf);
+ break;
+ } /* end switch */
+
+rddir2_exit:
+ FreeXid(xid);
+ return rc;
+}