From 2d6e833588058233479e9d934b0f6615871f7ce2 Mon Sep 17 00:00:00 2001
From: Aurelien Aptel <aaptel@suse.com>
Date: Thu, 14 Mar 2019 00:29:17 -0500
Subject: [PATCH] CIFS: make mknod() an smb_version_op
This cleanup removes cifs specific code from SMB2/SMB3 code paths
which is cleaner and easier to maintain as the code to handle
special files is improved. Below is an example creating special files
using 'sfu' mount option over SMB3 to Windows (with this patch)
(Note that to Samba server, support for saving dos attributes
has to be enabled for the SFU mount option to work).
In the future this will also make implementation of creating
special files as reparse points easier (as Windows NFS server does
for example).
root@smf-Thinkpad-P51:~# stat -c "%F" /mnt2/char
character special file
root@smf-Thinkpad-P51:~# stat -c "%F" /mnt2/block
block special file
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifs/cifsglob.h | 8 +++
fs/cifs/dir.c | 107 ++------------------------------------
fs/cifs/smb1ops.c | 126 +++++++++++++++++++++++++++++++++++++++++++++
fs/cifs/smb2ops.c | 102 ++++++++++++++++++++++++++++++++++++
4 files changed, 239 insertions(+), 104 deletions(-)
@@ -479,6 +479,14 @@ struct smb_version_operations {
struct cifs_tcon *tcon,
__le16 *path, int is_dir,
unsigned long p);
+ /* make unix special files (block, char, fifo, socket) */
+ int (*make_node)(unsigned int xid,
+ struct inode *inode,
+ struct dentry *dentry,
+ struct cifs_tcon *tcon,
+ char *full_path,
+ umode_t mode,
+ dev_t device_number);
};
struct smb_version_values {
@@ -621,20 +621,10 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
{
int rc = -EPERM;
unsigned int xid;
- int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
struct cifs_sb_info *cifs_sb;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
- struct cifs_io_parms io_parms;
char *full_path = NULL;
- struct inode *newinode = NULL;
- __u32 oplock = 0;
- struct cifs_fid fid;
- struct cifs_open_parms oparms;
- FILE_ALL_INFO *buf = NULL;
- unsigned int bytes_written;
- struct win_dev *pdev;
- struct kvec iov[2];
if (!old_valid_dev(device_number))
return -EINVAL;
@@ -654,103 +644,12 @@ int cifs_mknod(struct inode *inode, struct dentry *direntry, umode_t mode,
goto mknod_out;
}
- if (tcon->unix_ext) {
- struct cifs_unix_set_info_args args = {
- .mode = mode & ~current_umask(),
- .ctime = NO_CHANGE_64,
- .atime = NO_CHANGE_64,
- .mtime = NO_CHANGE_64,
- .device = device_number,
- };
- if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
- args.uid = current_fsuid();
- args.gid = current_fsgid();
- } else {
- args.uid = INVALID_UID; /* no change */
- args.gid = INVALID_GID; /* no change */
- }
- rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
- cifs_sb->local_nls,
- cifs_remap(cifs_sb));
- if (rc)
- goto mknod_out;
-
- rc = cifs_get_inode_info_unix(&newinode, full_path,
- inode->i_sb, xid);
-
- if (rc == 0)
- d_instantiate(direntry, newinode);
- goto mknod_out;
- }
-
- if (!S_ISCHR(mode) && !S_ISBLK(mode))
- goto mknod_out;
-
- if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
- goto mknod_out;
-
-
- cifs_dbg(FYI, "sfu compat create special file\n");
-
- buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
- if (buf == NULL) {
- rc = -ENOMEM;
- goto mknod_out;
- }
-
- if (backup_cred(cifs_sb))
- create_options |= CREATE_OPEN_BACKUP_INTENT;
-
- oparms.tcon = tcon;
- oparms.cifs_sb = cifs_sb;
- oparms.desired_access = GENERIC_WRITE;
- oparms.create_options = create_options;
- oparms.disposition = FILE_CREATE;
- oparms.path = full_path;
- oparms.fid = &fid;
- oparms.reconnect = false;
-
- if (tcon->ses->server->oplocks)
- oplock = REQ_OPLOCK;
- else
- oplock = 0;
- rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
- if (rc)
- goto mknod_out;
-
- /*
- * BB Do not bother to decode buf since no local inode yet to put
- * timestamps in, but we can reuse it safely.
- */
-
- pdev = (struct win_dev *)buf;
- io_parms.pid = current->tgid;
- io_parms.tcon = tcon;
- io_parms.offset = 0;
- io_parms.length = sizeof(struct win_dev);
- iov[1].iov_base = buf;
- iov[1].iov_len = sizeof(struct win_dev);
- if (S_ISCHR(mode)) {
- memcpy(pdev->type, "IntxCHR", 8);
- pdev->major = cpu_to_le64(MAJOR(device_number));
- pdev->minor = cpu_to_le64(MINOR(device_number));
- rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
- &bytes_written, iov, 1);
- } else if (S_ISBLK(mode)) {
- memcpy(pdev->type, "IntxBLK", 8);
- pdev->major = cpu_to_le64(MAJOR(device_number));
- pdev->minor = cpu_to_le64(MINOR(device_number));
- rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
- &bytes_written, iov, 1);
- }
- tcon->ses->server->ops->close(xid, tcon, &fid);
- d_drop(direntry);
-
- /* FIXME: add code here to set EAs */
+ rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
+ full_path, mode,
+ device_number);
mknod_out:
kfree(full_path);
- kfree(buf);
free_xid(xid);
cifs_put_tlink(tlink);
return rc;
@@ -1027,6 +1027,131 @@ cifs_can_echo(struct TCP_Server_Info *server)
return false;
}
+static int
+cifs_make_node(unsigned int xid, struct inode *inode,
+ struct dentry *dentry, struct cifs_tcon *tcon,
+ char *full_path, umode_t mode, dev_t dev)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ struct inode *newinode = NULL;
+ int rc = -EPERM;
+ int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
+ FILE_ALL_INFO *buf = NULL;
+ struct cifs_io_parms io_parms;
+ __u32 oplock = 0;
+ struct cifs_fid fid;
+ struct cifs_open_parms oparms;
+ unsigned int bytes_written;
+ struct win_dev *pdev;
+ struct kvec iov[2];
+
+ if (tcon->unix_ext) {
+ /*
+ * SMB1 Unix Extensions: requires server support but
+ * works with all special files
+ */
+ struct cifs_unix_set_info_args args = {
+ .mode = mode & ~current_umask(),
+ .ctime = NO_CHANGE_64,
+ .atime = NO_CHANGE_64,
+ .mtime = NO_CHANGE_64,
+ .device = dev,
+ };
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
+ args.uid = current_fsuid();
+ args.gid = current_fsgid();
+ } else {
+ args.uid = INVALID_UID; /* no change */
+ args.gid = INVALID_GID; /* no change */
+ }
+ rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
+ cifs_sb->local_nls,
+ cifs_remap(cifs_sb));
+ if (rc)
+ goto out;
+
+ rc = cifs_get_inode_info_unix(&newinode, full_path,
+ inode->i_sb, xid);
+
+ if (rc == 0)
+ d_instantiate(dentry, newinode);
+ goto out;
+ }
+
+ /*
+ * SMB1 SFU emulation: should work with all servers, but only
+ * support block and char device (no socket & fifo)
+ */
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
+ goto out;
+
+ if (!S_ISCHR(mode) && !S_ISBLK(mode))
+ goto out;
+
+ cifs_dbg(FYI, "sfu compat create special file\n");
+
+ buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
+ if (buf == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ if (backup_cred(cifs_sb))
+ create_options |= CREATE_OPEN_BACKUP_INTENT;
+
+ oparms.tcon = tcon;
+ oparms.cifs_sb = cifs_sb;
+ oparms.desired_access = GENERIC_WRITE;
+ oparms.create_options = create_options;
+ oparms.disposition = FILE_CREATE;
+ oparms.path = full_path;
+ oparms.fid = &fid;
+ oparms.reconnect = false;
+
+ if (tcon->ses->server->oplocks)
+ oplock = REQ_OPLOCK;
+ else
+ oplock = 0;
+ rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
+ if (rc)
+ goto out;
+
+ /*
+ * BB Do not bother to decode buf since no local inode yet to put
+ * timestamps in, but we can reuse it safely.
+ */
+
+ pdev = (struct win_dev *)buf;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ io_parms.offset = 0;
+ io_parms.length = sizeof(struct win_dev);
+ iov[1].iov_base = buf;
+ iov[1].iov_len = sizeof(struct win_dev);
+ if (S_ISCHR(mode)) {
+ memcpy(pdev->type, "IntxCHR", 8);
+ pdev->major = cpu_to_le64(MAJOR(dev));
+ pdev->minor = cpu_to_le64(MINOR(dev));
+ rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
+ &bytes_written, iov, 1);
+ } else if (S_ISBLK(mode)) {
+ memcpy(pdev->type, "IntxBLK", 8);
+ pdev->major = cpu_to_le64(MAJOR(dev));
+ pdev->minor = cpu_to_le64(MINOR(dev));
+ rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
+ &bytes_written, iov, 1);
+ }
+ tcon->ses->server->ops->close(xid, tcon, &fid);
+ d_drop(dentry);
+
+ /* FIXME: add code here to set EAs */
+out:
+ kfree(buf);
+ return rc;
+}
+
+
+
struct smb_version_operations smb1_operations = {
.send_cancel = send_nt_cancel,
.compare_fids = cifs_compare_fids,
@@ -1110,6 +1235,7 @@ struct smb_version_operations smb1_operations = {
.get_acl_by_fid = get_cifs_acl_by_fid,
.set_acl = set_cifs_acl,
#endif /* CIFS_ACL */
+ .make_node = cifs_make_node,
};
struct smb_version_values smb1_values = {
@@ -3780,6 +3780,104 @@ smb2_next_header(char *buf)
return le32_to_cpu(hdr->NextCommand);
}
+static int
+smb2_make_node(unsigned int xid, struct inode *inode,
+ struct dentry *dentry, struct cifs_tcon *tcon,
+ char *full_path, umode_t mode, dev_t dev)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
+ int rc = -EPERM;
+ int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
+ FILE_ALL_INFO *buf = NULL;
+ struct cifs_io_parms io_parms;
+ __u32 oplock = 0;
+ struct cifs_fid fid;
+ struct cifs_open_parms oparms;
+ unsigned int bytes_written;
+ struct win_dev *pdev;
+ struct kvec iov[2];
+
+ /*
+ * Check if mounted with mount parm 'sfu' mount parm.
+ * SFU emulation should work with all servers, but only
+ * supports block and char device (no socket & fifo),
+ * and was used by default in earlier versions of Windows
+ */
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
+ goto out;
+
+ /*
+ * TODO: Add ability to create instead via reparse point. Windows (e.g.
+ * their current NFS server) uses this approach to expose special files
+ * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
+ */
+
+ if (!S_ISCHR(mode) && !S_ISBLK(mode))
+ goto out;
+
+ cifs_dbg(FYI, "sfu compat create special file\n");
+
+ buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
+ if (buf == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ if (backup_cred(cifs_sb))
+ create_options |= CREATE_OPEN_BACKUP_INTENT;
+
+ oparms.tcon = tcon;
+ oparms.cifs_sb = cifs_sb;
+ oparms.desired_access = GENERIC_WRITE;
+ oparms.create_options = create_options;
+ oparms.disposition = FILE_CREATE;
+ oparms.path = full_path;
+ oparms.fid = &fid;
+ oparms.reconnect = false;
+
+ if (tcon->ses->server->oplocks)
+ oplock = REQ_OPLOCK;
+ else
+ oplock = 0;
+ rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
+ if (rc)
+ goto out;
+
+ /*
+ * BB Do not bother to decode buf since no local inode yet to put
+ * timestamps in, but we can reuse it safely.
+ */
+
+ pdev = (struct win_dev *)buf;
+ io_parms.pid = current->tgid;
+ io_parms.tcon = tcon;
+ io_parms.offset = 0;
+ io_parms.length = sizeof(struct win_dev);
+ iov[1].iov_base = buf;
+ iov[1].iov_len = sizeof(struct win_dev);
+ if (S_ISCHR(mode)) {
+ memcpy(pdev->type, "IntxCHR", 8);
+ pdev->major = cpu_to_le64(MAJOR(dev));
+ pdev->minor = cpu_to_le64(MINOR(dev));
+ rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
+ &bytes_written, iov, 1);
+ } else if (S_ISBLK(mode)) {
+ memcpy(pdev->type, "IntxBLK", 8);
+ pdev->major = cpu_to_le64(MAJOR(dev));
+ pdev->minor = cpu_to_le64(MINOR(dev));
+ rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
+ &bytes_written, iov, 1);
+ }
+ tcon->ses->server->ops->close(xid, tcon, &fid);
+ d_drop(dentry);
+
+ /* FIXME: add code here to set EAs */
+out:
+ kfree(buf);
+ return rc;
+}
+
+
struct smb_version_operations smb20_operations = {
.compare_fids = smb2_compare_fids,
.setup_request = smb2_setup_request,
@@ -3874,6 +3972,7 @@ struct smb_version_operations smb20_operations = {
#endif /* CIFS_ACL */
.next_header = smb2_next_header,
.ioctl_query_info = smb2_ioctl_query_info,
+ .make_node = smb2_make_node,
};
struct smb_version_operations smb21_operations = {
@@ -3972,6 +4071,7 @@ struct smb_version_operations smb21_operations = {
#endif /* CIFS_ACL */
.next_header = smb2_next_header,
.ioctl_query_info = smb2_ioctl_query_info,
+ .make_node = smb2_make_node,
};
struct smb_version_operations smb30_operations = {
@@ -4079,6 +4179,7 @@ struct smb_version_operations smb30_operations = {
#endif /* CIFS_ACL */
.next_header = smb2_next_header,
.ioctl_query_info = smb2_ioctl_query_info,
+ .make_node = smb2_make_node,
};
struct smb_version_operations smb311_operations = {
@@ -4187,6 +4288,7 @@ struct smb_version_operations smb311_operations = {
#endif /* CIFS_ACL */
.next_header = smb2_next_header,
.ioctl_query_info = smb2_ioctl_query_info,
+ .make_node = smb2_make_node,
};
struct smb_version_values smb20_values = {
--
2.17.1
This is a trimmed down version of a patch that Aurelien sent earlier (which doesn't add the new reparse point creation code, but does cleanup and refactor the sfu and the cifs specific unix extensions code as he suggested). Note that SFU works fine with SMB3 to Windows (although note that we haven't changed the defaults, mount option 'sfu' is not enabled by default). I tested with this updated version of the patch. This cleanup removes cifs specific code from SMB2/SMB3 code paths which is cleaner and easier to maintain as the code to handle special files is improved. Below is an example creating special files using 'sfu' mount option over SMB3 to Windows (with this patch) (Note that to Samba server, support for saving dos attributes has to be enabled for the SFU mount option to work). In the future this will also make implementation of creating special files as reparse points easier (as Windows NFS server does for example). root@smf-Thinkpad-P51:~# stat -c "%F" /mnt2/char character special file root@smf-Thinkpad-P51:~# stat -c "%F" /mnt2/block block special file