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-rw-r--r--kernel/fs/cifs/readdir.c875
1 files changed, 875 insertions, 0 deletions
diff --git a/kernel/fs/cifs/readdir.c b/kernel/fs/cifs/readdir.c
new file mode 100644
index 000000000..b1eede367
--- /dev/null
+++ b/kernel/fs/cifs/readdir.c
@@ -0,0 +1,875 @@
+/*
+ * 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) {
+ cifs_dbg(FYI, "empty cifs private file data\n");
+ return;
+ }
+ if (cf->invalidHandle)
+ cifs_dbg(FYI, "invalid handle\n");
+ if (cf->srch_inf.endOfSearch)
+ cifs_dbg(FYI, "end of search\n");
+ if (cf->srch_inf.emptyDir)
+ cifs_dbg(FYI, "empty dir\n");
+ }
+}
+#else
+static inline void dump_cifs_file_struct(struct file *file, char *label)
+{
+}
+#endif /* DEBUG2 */
+
+/*
+ * Attempt to preload the dcache with the results from the FIND_FIRST/NEXT
+ *
+ * Find the dentry that matches "name". If there isn't one, create one. If it's
+ * a negative dentry or the uniqueid or filetype(mode) changed,
+ * then drop it and recreate it.
+ */
+static void
+cifs_prime_dcache(struct dentry *parent, struct qstr *name,
+ struct cifs_fattr *fattr)
+{
+ struct dentry *dentry, *alias;
+ struct inode *inode;
+ struct super_block *sb = d_inode(parent)->i_sb;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+
+ cifs_dbg(FYI, "%s: for %s\n", __func__, name->name);
+
+ dentry = d_hash_and_lookup(parent, name);
+ if (unlikely(IS_ERR(dentry)))
+ return;
+
+ if (dentry) {
+ inode = d_inode(dentry);
+ if (inode) {
+ if (d_mountpoint(dentry))
+ goto out;
+ /*
+ * If we're generating inode numbers, then we don't
+ * want to clobber the existing one with the one that
+ * the readdir code created.
+ */
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM))
+ fattr->cf_uniqueid = CIFS_I(inode)->uniqueid;
+
+ /* update inode in place
+ * if both i_ino and i_mode didn't change */
+ if (CIFS_I(inode)->uniqueid == fattr->cf_uniqueid &&
+ (inode->i_mode & S_IFMT) ==
+ (fattr->cf_mode & S_IFMT)) {
+ cifs_fattr_to_inode(inode, fattr);
+ goto out;
+ }
+ }
+ d_invalidate(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;
+
+ dentry = d_alloc(parent, name);
+ if (!dentry)
+ return;
+
+ inode = cifs_iget(sb, fattr);
+ if (!inode)
+ goto out;
+
+ alias = d_splice_alias(inode, dentry);
+ if (alias && !IS_ERR(alias))
+ dput(alias);
+out:
+ dput(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;
+ }
+
+ /*
+ * We need to revalidate it further to make a decision about whether it
+ * is a symbolic link, DFS referral or a reparse point with a direct
+ * access like junctions, deduplicated files, NFS symlinks.
+ */
+ if (fattr->cf_cifsattrs & ATTR_REPARSE)
+ fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
+
+ /* non-unix readdir doesn't provide nlink */
+ fattr->cf_flags |= CIFS_FATTR_UNKNOWN_NLINK;
+
+ if (fattr->cf_cifsattrs & ATTR_READONLY)
+ fattr->cf_mode &= ~S_IWUGO;
+
+ /*
+ * We of course don't get ACL info in FIND_FIRST/NEXT results, so
+ * mark it for revalidation so that "ls -l" will look right. It might
+ * be super-slow, but if we don't do this then the ownership of files
+ * may look wrong since the inodes may not have timed out by the time
+ * "ls" does a stat() call on them.
+ */
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
+ fattr->cf_flags |= CIFS_FATTR_NEED_REVAL;
+
+ 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;
+ }
+ }
+}
+
+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,
+ unsigned 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_remap(cifs_sb);
+ if (!rc) {
+ tmpbuffer = kmalloc(maxpath);
+ rc = CIFSSMBQueryReparseLinkInfo(xid, ptcon, full_path,
+ tmpbuffer,
+ maxpath -1,
+ fid,
+ cifs_sb->local_nls);
+ if (CIFSSMBClose(xid, ptcon, fid)) {
+ cifs_dbg(FYI, "Error closing temporary reparsepoint open\n");
+ }
+ }
+}
+ */
+
+static int
+initiate_cifs_search(const unsigned 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_FILE_SB(file);
+ struct tcon_link *tlink = NULL;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+
+ 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);
+ tcon = tlink_tcon(tlink);
+ } else {
+ cifsFile = file->private_data;
+ tcon = tlink_tcon(cifsFile->tlink);
+ }
+
+ server = tcon->ses->server;
+
+ if (!server->ops->query_dir_first) {
+ rc = -ENOSYS;
+ goto error_exit;
+ }
+
+ 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;
+ }
+
+ cifs_dbg(FYI, "Full path: %s start at: %lld\n", 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 (cap_unix(tcon->ses) { */
+ if (tcon->unix_ext)
+ cifsFile->srch_inf.info_level = SMB_FIND_FILE_UNIX;
+ else if ((tcon->ses->capabilities &
+ tcon->ses->server->vals->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 = server->ops->query_dir_first(xid, tcon, full_path, cifs_sb,
+ &cifsFile->fid, search_flags,
+ &cifsFile->srch_inf);
+
+ 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;
+ }
+ cifs_dbg(FYI, "Unicode string longer than PATH_MAX found\n");
+ 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);
+ cifs_dbg(FYI, "new entry %p old entry %p\n", new_entry, old_entry);
+ /* validate that new_entry is not past end of SMB */
+ if (new_entry >= end_of_smb) {
+ cifs_dbg(VFS, "search entry %p began after end of SMB %p old entry %p\n",
+ 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))) {
+ cifs_dbg(VFS, "search entry %p extends after end of SMB %p\n",
+ 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:
+ cifs_dbg(FYI, "Unknown findfirst level %d\n", 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_inode(file);
+ 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 unsigned int xid, struct cifs_tcon *tcon, loff_t pos,
+ struct file *file, char **current_entry, 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 = pos;
+ struct cifsFileInfo *cfile = file->private_data;
+ struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
+ struct TCP_Server_Info *server = tcon->ses->server;
+ /* check if index in the buffer */
+
+ if (!server->ops->query_dir_first || !server->ops->query_dir_next)
+ return -ENOSYS;
+
+ if ((cfile == NULL) || (current_entry == NULL) || (num_to_ret == NULL))
+ return -ENOENT;
+
+ *current_entry = NULL;
+ first_entry_in_buffer = cfile->srch_inf.index_of_last_entry -
+ cfile->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 < cfile->srch_inf.index_of_last_entry) &&
+ is_dir_changed(file)) || (index_to_find < first_entry_in_buffer)) {
+ /* close and restart search */
+ cifs_dbg(FYI, "search backing up - close and restart search\n");
+ spin_lock(&cifs_file_list_lock);
+ if (server->ops->dir_needs_close(cfile)) {
+ cfile->invalidHandle = true;
+ spin_unlock(&cifs_file_list_lock);
+ if (server->ops->close_dir)
+ server->ops->close_dir(xid, tcon, &cfile->fid);
+ } else
+ spin_unlock(&cifs_file_list_lock);
+ if (cfile->srch_inf.ntwrk_buf_start) {
+ cifs_dbg(FYI, "freeing SMB ff cache buf on search rewind\n");
+ if (cfile->srch_inf.smallBuf)
+ cifs_small_buf_release(cfile->srch_inf.
+ ntwrk_buf_start);
+ else
+ cifs_buf_release(cfile->srch_inf.
+ ntwrk_buf_start);
+ cfile->srch_inf.ntwrk_buf_start = NULL;
+ }
+ rc = initiate_cifs_search(xid, file);
+ if (rc) {
+ cifs_dbg(FYI, "error %d reinitiating a search on rewind\n",
+ rc);
+ return rc;
+ }
+ /* FindFirst/Next set last_entry to NULL on malformed reply */
+ if (cfile->srch_inf.last_entry)
+ cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
+ }
+
+ 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 >= cfile->srch_inf.index_of_last_entry) &&
+ (rc == 0) && !cfile->srch_inf.endOfSearch) {
+ cifs_dbg(FYI, "calling findnext2\n");
+ rc = server->ops->query_dir_next(xid, tcon, &cfile->fid,
+ search_flags,
+ &cfile->srch_inf);
+ /* FindFirst/Next set last_entry to NULL on malformed reply */
+ if (cfile->srch_inf.last_entry)
+ cifs_save_resume_key(cfile->srch_inf.last_entry, cfile);
+ if (rc)
+ return -ENOENT;
+ }
+ if (index_to_find < cfile->srch_inf.index_of_last_entry) {
+ /* we found the buffer that contains the entry */
+ /* scan and find it */
+ int i;
+ char *cur_ent;
+ char *end_of_smb = cfile->srch_inf.ntwrk_buf_start +
+ server->ops->calc_smb_size(
+ cfile->srch_inf.ntwrk_buf_start);
+
+ cur_ent = cfile->srch_inf.srch_entries_start;
+ first_entry_in_buffer = cfile->srch_inf.index_of_last_entry
+ - cfile->srch_inf.entries_in_buffer;
+ pos_in_buf = index_to_find - first_entry_in_buffer;
+ cifs_dbg(FYI, "found entry - pos_in_buf %d\n", pos_in_buf);
+
+ for (i = 0; (i < (pos_in_buf)) && (cur_ent != NULL); i++) {
+ /* go entry by entry figuring out which is first */
+ cur_ent = nxt_dir_entry(cur_ent, end_of_smb,
+ cfile->srch_inf.info_level);
+ }
+ if ((cur_ent == NULL) && (i < pos_in_buf)) {
+ /* BB fixme - check if we should flag this error */
+ cifs_dbg(VFS, "reached end of buf searching for pos in buf %d index to find %lld rc %d\n",
+ pos_in_buf, index_to_find, rc);
+ }
+ rc = 0;
+ *current_entry = cur_ent;
+ } else {
+ cifs_dbg(FYI, "index not in buffer - could not findnext into it\n");
+ return 0;
+ }
+
+ if (pos_in_buf >= cfile->srch_inf.entries_in_buffer) {
+ cifs_dbg(FYI, "can not return entries pos_in_buf beyond last\n");
+ *num_to_ret = 0;
+ } else
+ *num_to_ret = cfile->srch_inf.entries_in_buffer - pos_in_buf;
+
+ return rc;
+}
+
+static int cifs_filldir(char *find_entry, struct file *file,
+ struct dir_context *ctx,
+ char *scratch_buf, unsigned int max_len)
+{
+ struct cifsFileInfo *file_info = file->private_data;
+ struct super_block *sb = file_inode(file)->i_sb;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifs_dirent de = { NULL, };
+ struct cifs_fattr fattr;
+ 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) {
+ cifs_dbg(VFS, "bad search response length %zd past smb end\n",
+ 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;
+ int map_type;
+
+ map_type = cifs_remap(cifs_sb);
+ 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, map_type);
+ 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) &&
+ couldbe_mf_symlink(&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;
+
+ cifs_prime_dcache(file->f_path.dentry, &name, &fattr);
+
+ ino = cifs_uniqueid_to_ino_t(fattr.cf_uniqueid);
+ return !dir_emit(ctx, name.name, name.len, ino, fattr.cf_dtype);
+}
+
+
+int cifs_readdir(struct file *file, struct dir_context *ctx)
+{
+ int rc = 0;
+ unsigned int xid;
+ int i;
+ struct cifs_tcon *tcon;
+ 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 = get_xid();
+
+ /*
+ * 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);
+ cifs_dbg(FYI, "initiate cifs search rc %d\n", rc);
+ if (rc)
+ goto rddir2_exit;
+ }
+
+ if (!dir_emit_dots(file, ctx))
+ goto rddir2_exit;
+
+ /* 1) If search is active,
+ is in current search buffer?
+ if it before then restart search
+ if after then keep searching till find it */
+
+ cifsFile = file->private_data;
+ if (cifsFile->srch_inf.endOfSearch) {
+ if (cifsFile->srch_inf.emptyDir) {
+ cifs_dbg(FYI, "End of search, empty dir\n");
+ rc = 0;
+ goto rddir2_exit;
+ }
+ } /* else {
+ cifsFile->invalidHandle = true;
+ tcon->ses->server->close(xid, tcon, &cifsFile->fid);
+ } */
+
+ tcon = tlink_tcon(cifsFile->tlink);
+ rc = find_cifs_entry(xid, tcon, ctx->pos, file, &current_entry,
+ &num_to_fill);
+ if (rc) {
+ cifs_dbg(FYI, "fce error %d\n", rc);
+ goto rddir2_exit;
+ } else if (current_entry != NULL) {
+ cifs_dbg(FYI, "entry %lld found\n", ctx->pos);
+ } else {
+ cifs_dbg(FYI, "could not find entry\n");
+ goto rddir2_exit;
+ }
+ cifs_dbg(FYI, "loop through %d times filling dir for net buf %p\n",
+ num_to_fill, cifsFile->srch_inf.ntwrk_buf_start);
+ max_len = tcon->ses->server->ops->calc_smb_size(
+ 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;
+ goto rddir2_exit;
+ }
+
+ for (i = 0; i < num_to_fill; i++) {
+ if (current_entry == NULL) {
+ /* evaluate whether this case is an error */
+ cifs_dbg(VFS, "past SMB end, num to fill %d i %d\n",
+ 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, ctx,
+ tmp_buf, max_len);
+ if (rc) {
+ if (rc > 0)
+ rc = 0;
+ break;
+ }
+
+ ctx->pos++;
+ if (ctx->pos ==
+ cifsFile->srch_inf.index_of_last_entry) {
+ cifs_dbg(FYI, "last entry in buf at pos %lld %s\n",
+ ctx->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);
+
+rddir2_exit:
+ free_xid(xid);
+ return rc;
+}