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-rw-r--r--fs/cifs/link.c145
1 files changed, 137 insertions, 8 deletions
diff --git a/fs/cifs/link.c b/fs/cifs/link.c
index 5657416d3483..2ec6037f61c7 100644
--- a/fs/cifs/link.c
+++ b/fs/cifs/link.c
@@ -28,6 +28,10 @@
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
+#include "cifs_unicode.h"
+#ifdef CONFIG_CIFS_SMB2
+#include "smb2proto.h"
+#endif
/*
* M-F Symlink Functions - Begin
@@ -401,6 +405,134 @@ cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
}
/*
+ * SMB 2.1/SMB3 Protocol specific functions
+ */
+#ifdef CONFIG_CIFS_SMB2
+int
+smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, const unsigned char *path,
+ char *pbuf, unsigned int *pbytes_read)
+{
+ int rc;
+ struct cifs_fid fid;
+ struct cifs_open_parms oparms;
+ struct cifs_io_parms io_parms;
+ int buf_type = CIFS_NO_BUFFER;
+ __le16 *utf16_path;
+ __u8 oplock = SMB2_OPLOCK_LEVEL_II;
+ struct smb2_file_all_info *pfile_info = NULL;
+
+ oparms.tcon = tcon;
+ oparms.cifs_sb = cifs_sb;
+ oparms.desired_access = GENERIC_READ;
+ oparms.create_options = CREATE_NOT_DIR;
+ if (backup_cred(cifs_sb))
+ oparms.create_options |= CREATE_OPEN_BACKUP_INTENT;
+ oparms.disposition = FILE_OPEN;
+ oparms.fid = &fid;
+ oparms.reconnect = false;
+
+ utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+ if (utf16_path == NULL)
+ return -ENOMEM;
+
+ pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
+ GFP_KERNEL);
+
+ if (pfile_info == NULL) {
+ kfree(utf16_path);
+ return -ENOMEM;
+ }
+
+ rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL);
+ if (rc)
+ goto qmf_out_open_fail;
+
+ if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
+ /* it's not a symlink */
+ rc = -ENOENT; /* Is there a better rc to return? */
+ goto qmf_out;
+ }
+
+ io_parms.netfid = fid.netfid;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ io_parms.offset = 0;
+ io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
+ io_parms.persistent_fid = fid.persistent_fid;
+ io_parms.volatile_fid = fid.volatile_fid;
+ rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
+qmf_out:
+ SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+qmf_out_open_fail:
+ kfree(utf16_path);
+ kfree(pfile_info);
+ return rc;
+}
+
+int
+smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, const unsigned char *path,
+ char *pbuf, unsigned int *pbytes_written)
+{
+ int rc;
+ struct cifs_fid fid;
+ struct cifs_open_parms oparms;
+ struct cifs_io_parms io_parms;
+ int create_options = CREATE_NOT_DIR;
+ __le16 *utf16_path;
+ __u8 oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
+ struct kvec iov[2];
+
+ if (backup_cred(cifs_sb))
+ create_options |= CREATE_OPEN_BACKUP_INTENT;
+
+ cifs_dbg(FYI, "%s: path: %s\n", __func__, path);
+
+ utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+ if (!utf16_path)
+ return -ENOMEM;
+
+ oparms.tcon = tcon;
+ oparms.cifs_sb = cifs_sb;
+ oparms.desired_access = GENERIC_WRITE;
+ oparms.create_options = create_options;
+ oparms.disposition = FILE_CREATE;
+ oparms.fid = &fid;
+ oparms.reconnect = false;
+
+ rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
+ if (rc) {
+ kfree(utf16_path);
+ return rc;
+ }
+
+ io_parms.netfid = fid.netfid;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ io_parms.offset = 0;
+ io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
+ io_parms.persistent_fid = fid.persistent_fid;
+ io_parms.volatile_fid = fid.volatile_fid;
+
+ /* iov[0] is reserved for smb header */
+ iov[1].iov_base = pbuf;
+ iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE;
+
+ rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1);
+
+ /* Make sure we wrote all of the symlink data */
+ if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE))
+ rc = -EIO;
+
+ SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
+
+ kfree(utf16_path);
+ return rc;
+}
+#endif /* CONFIG_CIFS_SMB2 */
+
+/*
* M-F Symlink Functions - End
*/
@@ -435,8 +567,7 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
if (tcon->unix_ext)
rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name,
cifs_sb->local_nls,
- cifs_sb->mnt_cifs_flags &
- CIFS_MOUNT_MAP_SPECIAL_CHR);
+ cifs_remap(cifs_sb));
else {
server = tcon->ses->server;
if (!server->ops->create_hardlink) {
@@ -461,11 +592,7 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
spin_lock(&old_file->d_inode->i_lock);
inc_nlink(old_file->d_inode);
spin_unlock(&old_file->d_inode->i_lock);
- /*
- * BB should we make this contingent on superblock flag
- * NOATIME?
- */
- /* old_file->d_inode->i_ctime = CURRENT_TIME; */
+
/*
* parent dir timestamps will update from srv within a
* second, would it really be worth it to set the parent
@@ -475,7 +602,9 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
}
/*
* if not oplocked will force revalidate to get info on source
- * file from srv
+ * file from srv. Note Samba server prior to 4.2 has bug -
+ * not updating src file ctime on hardlinks but Windows servers
+ * handle it properly
*/
cifsInode->time = 0;