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![Jeff Layton](/assets/img/avatar_default.png)
This is more or less the same patch as before, but with some merge conflicts fixed up. If a process has a dirty page mapped into its page tables, then it has the ability to change it while the client is trying to write the data out to the server. If that happens after the signature has been calculated then that signature will then be wrong, and the server will likely reset the TCP connection. This patch adds a page_mkwrite handler for CIFS that simply takes the page lock. Because the page lock is held over the life of writepage and writepages, this prevents the page from becoming writeable until the write call has completed. With this, we can also remove the "sign_zero_copy" module option and always inline the pages when writing. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
1089 lines
29 KiB
C
1089 lines
29 KiB
C
/*
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* fs/cifs/cifsfs.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2008
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* Common Internet FileSystem (CIFS) client
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Note that BB means BUGBUG (ie something to fix eventually) */
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/mount.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/seq_file.h>
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#include <linux/vfs.h>
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#include <linux/mempool.h>
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#include <linux/delay.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <net/ipv6.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#define DECLARE_GLOBALS_HERE
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include <linux/mm.h>
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#include <linux/key-type.h>
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#include "cifs_spnego.h"
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#include "fscache.h"
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#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
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int cifsFYI = 0;
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int cifsERROR = 1;
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int traceSMB = 0;
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unsigned int oplockEnabled = 1;
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unsigned int linuxExtEnabled = 1;
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unsigned int lookupCacheEnabled = 1;
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unsigned int multiuser_mount = 0;
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unsigned int global_secflags = CIFSSEC_DEF;
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/* unsigned int ntlmv2_support = 0; */
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unsigned int sign_CIFS_PDUs = 1;
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static const struct super_operations cifs_super_ops;
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unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
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module_param(CIFSMaxBufSize, int, 0);
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MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
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"Default: 16384 Range: 8192 to 130048");
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unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
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module_param(cifs_min_rcv, int, 0);
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MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
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"1 to 64");
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unsigned int cifs_min_small = 30;
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module_param(cifs_min_small, int, 0);
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MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
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"Range: 2 to 256");
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unsigned int cifs_max_pending = CIFS_MAX_REQ;
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module_param(cifs_max_pending, int, 0);
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MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
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"Default: 50 Range: 2 to 256");
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unsigned short echo_retries = 5;
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module_param(echo_retries, ushort, 0644);
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MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
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"reconnecting server. Default: 5. 0 means "
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"never reconnect.");
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extern mempool_t *cifs_sm_req_poolp;
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extern mempool_t *cifs_req_poolp;
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extern mempool_t *cifs_mid_poolp;
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void
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cifs_sb_active(struct super_block *sb)
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{
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struct cifs_sb_info *server = CIFS_SB(sb);
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if (atomic_inc_return(&server->active) == 1)
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atomic_inc(&sb->s_active);
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}
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void
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cifs_sb_deactive(struct super_block *sb)
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{
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struct cifs_sb_info *server = CIFS_SB(sb);
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if (atomic_dec_and_test(&server->active))
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deactivate_super(sb);
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}
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static int
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cifs_read_super(struct super_block *sb, void *data,
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const char *devname, int silent)
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{
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struct inode *inode;
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struct cifs_sb_info *cifs_sb;
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int rc = 0;
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/* BB should we make this contingent on mount parm? */
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sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
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sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
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cifs_sb = CIFS_SB(sb);
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if (cifs_sb == NULL)
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return -ENOMEM;
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spin_lock_init(&cifs_sb->tlink_tree_lock);
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cifs_sb->tlink_tree = RB_ROOT;
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rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
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if (rc) {
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kfree(cifs_sb);
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return rc;
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}
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cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
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#ifdef CONFIG_CIFS_DFS_UPCALL
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/* copy mount params to sb for use in submounts */
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/* BB: should we move this after the mount so we
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* do not have to do the copy on failed mounts?
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* BB: May be it is better to do simple copy before
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* complex operation (mount), and in case of fail
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* just exit instead of doing mount and attempting
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* undo it if this copy fails?*/
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if (data) {
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int len = strlen(data);
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cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
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if (cifs_sb->mountdata == NULL) {
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bdi_destroy(&cifs_sb->bdi);
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kfree(sb->s_fs_info);
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sb->s_fs_info = NULL;
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return -ENOMEM;
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}
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strncpy(cifs_sb->mountdata, data, len + 1);
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cifs_sb->mountdata[len] = '\0';
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}
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#endif
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rc = cifs_mount(sb, cifs_sb, data, devname);
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if (rc) {
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if (!silent)
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cERROR(1, "cifs_mount failed w/return code = %d", rc);
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goto out_mount_failed;
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}
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sb->s_magic = CIFS_MAGIC_NUMBER;
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sb->s_op = &cifs_super_ops;
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sb->s_bdi = &cifs_sb->bdi;
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sb->s_blocksize = CIFS_MAX_MSGSIZE;
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sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
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inode = cifs_root_iget(sb, ROOT_I);
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if (IS_ERR(inode)) {
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rc = PTR_ERR(inode);
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inode = NULL;
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goto out_no_root;
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}
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sb->s_root = d_alloc_root(inode);
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if (!sb->s_root) {
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rc = -ENOMEM;
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goto out_no_root;
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}
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/* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
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if (cifs_sb_master_tcon(cifs_sb)->nocase)
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sb->s_d_op = &cifs_ci_dentry_ops;
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else
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sb->s_d_op = &cifs_dentry_ops;
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#ifdef CONFIG_CIFS_EXPERIMENTAL
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
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cFYI(1, "export ops supported");
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sb->s_export_op = &cifs_export_ops;
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}
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#endif /* EXPERIMENTAL */
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return 0;
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out_no_root:
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cERROR(1, "cifs_read_super: get root inode failed");
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if (inode)
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iput(inode);
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cifs_umount(sb, cifs_sb);
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out_mount_failed:
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if (cifs_sb) {
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#ifdef CONFIG_CIFS_DFS_UPCALL
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if (cifs_sb->mountdata) {
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kfree(cifs_sb->mountdata);
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cifs_sb->mountdata = NULL;
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}
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#endif
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unload_nls(cifs_sb->local_nls);
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bdi_destroy(&cifs_sb->bdi);
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kfree(cifs_sb);
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}
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return rc;
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}
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static void
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cifs_put_super(struct super_block *sb)
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{
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int rc = 0;
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struct cifs_sb_info *cifs_sb;
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cFYI(1, "In cifs_put_super");
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cifs_sb = CIFS_SB(sb);
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if (cifs_sb == NULL) {
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cFYI(1, "Empty cifs superblock info passed to unmount");
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return;
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}
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rc = cifs_umount(sb, cifs_sb);
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if (rc)
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cERROR(1, "cifs_umount failed with return code %d", rc);
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#ifdef CONFIG_CIFS_DFS_UPCALL
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if (cifs_sb->mountdata) {
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kfree(cifs_sb->mountdata);
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cifs_sb->mountdata = NULL;
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}
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#endif
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unload_nls(cifs_sb->local_nls);
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bdi_destroy(&cifs_sb->bdi);
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kfree(cifs_sb);
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}
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static int
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cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *sb = dentry->d_sb;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
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int rc = -EOPNOTSUPP;
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int xid;
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xid = GetXid();
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buf->f_type = CIFS_MAGIC_NUMBER;
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/*
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* PATH_MAX may be too long - it would presumably be total path,
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* but note that some servers (includinng Samba 3) have a shorter
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* maximum path.
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*
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* Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
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*/
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buf->f_namelen = PATH_MAX;
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buf->f_files = 0; /* undefined */
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buf->f_ffree = 0; /* unlimited */
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/*
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* We could add a second check for a QFS Unix capability bit
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*/
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if ((tcon->ses->capabilities & CAP_UNIX) &&
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(CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
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rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
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/*
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* Only need to call the old QFSInfo if failed on newer one,
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* e.g. by OS/2.
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**/
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if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
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rc = CIFSSMBQFSInfo(xid, tcon, buf);
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/*
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* Some old Windows servers also do not support level 103, retry with
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* older level one if old server failed the previous call or we
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* bypassed it because we detected that this was an older LANMAN sess
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*/
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if (rc)
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rc = SMBOldQFSInfo(xid, tcon, buf);
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FreeXid(xid);
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return 0;
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}
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static int cifs_permission(struct inode *inode, int mask, unsigned int flags)
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{
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struct cifs_sb_info *cifs_sb;
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if (flags & IPERM_FLAG_RCU)
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return -ECHILD;
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cifs_sb = CIFS_SB(inode->i_sb);
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
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if ((mask & MAY_EXEC) && !execute_ok(inode))
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return -EACCES;
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else
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return 0;
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} else /* file mode might have been restricted at mount time
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on the client (above and beyond ACL on servers) for
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servers which do not support setting and viewing mode bits,
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so allowing client to check permissions is useful */
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return generic_permission(inode, mask, flags, NULL);
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}
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static struct kmem_cache *cifs_inode_cachep;
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static struct kmem_cache *cifs_req_cachep;
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static struct kmem_cache *cifs_mid_cachep;
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static struct kmem_cache *cifs_sm_req_cachep;
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mempool_t *cifs_sm_req_poolp;
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mempool_t *cifs_req_poolp;
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mempool_t *cifs_mid_poolp;
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static struct inode *
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cifs_alloc_inode(struct super_block *sb)
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{
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struct cifsInodeInfo *cifs_inode;
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cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
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if (!cifs_inode)
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return NULL;
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cifs_inode->cifsAttrs = 0x20; /* default */
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cifs_inode->time = 0;
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/* Until the file is open and we have gotten oplock
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info back from the server, can not assume caching of
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file data or metadata */
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cifs_set_oplock_level(cifs_inode, 0);
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cifs_inode->delete_pending = false;
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cifs_inode->invalid_mapping = false;
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cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
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cifs_inode->server_eof = 0;
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cifs_inode->uniqueid = 0;
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cifs_inode->createtime = 0;
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/* Can not set i_flags here - they get immediately overwritten
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to zero by the VFS */
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/* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
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INIT_LIST_HEAD(&cifs_inode->openFileList);
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return &cifs_inode->vfs_inode;
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}
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static void cifs_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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INIT_LIST_HEAD(&inode->i_dentry);
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kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
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}
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static void
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cifs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, cifs_i_callback);
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}
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static void
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cifs_evict_inode(struct inode *inode)
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{
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truncate_inode_pages(&inode->i_data, 0);
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end_writeback(inode);
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cifs_fscache_release_inode_cookie(inode);
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}
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static void
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cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
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{
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struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
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struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
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seq_printf(s, ",addr=");
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switch (server->dstaddr.ss_family) {
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case AF_INET:
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seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
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break;
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case AF_INET6:
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seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
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if (sa6->sin6_scope_id)
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seq_printf(s, "%%%u", sa6->sin6_scope_id);
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break;
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default:
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seq_printf(s, "(unknown)");
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}
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}
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/*
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* cifs_show_options() is for displaying mount options in /proc/mounts.
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* Not all settable options are displayed but most of the important
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* ones are.
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*/
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static int
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cifs_show_options(struct seq_file *s, struct vfsmount *m)
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{
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struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
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struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
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struct sockaddr *srcaddr;
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srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
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seq_printf(s, ",unc=%s", tcon->treeName);
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
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seq_printf(s, ",multiuser");
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else if (tcon->ses->user_name)
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seq_printf(s, ",username=%s", tcon->ses->user_name);
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if (tcon->ses->domainName)
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seq_printf(s, ",domain=%s", tcon->ses->domainName);
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|
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if (srcaddr->sa_family != AF_UNSPEC) {
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struct sockaddr_in *saddr4;
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struct sockaddr_in6 *saddr6;
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saddr4 = (struct sockaddr_in *)srcaddr;
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saddr6 = (struct sockaddr_in6 *)srcaddr;
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if (srcaddr->sa_family == AF_INET6)
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seq_printf(s, ",srcaddr=%pI6c",
|
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&saddr6->sin6_addr);
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else if (srcaddr->sa_family == AF_INET)
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seq_printf(s, ",srcaddr=%pI4",
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&saddr4->sin_addr.s_addr);
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else
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|
seq_printf(s, ",srcaddr=BAD-AF:%i",
|
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(int)(srcaddr->sa_family));
|
|
}
|
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|
|
seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
|
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seq_printf(s, ",forceuid");
|
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else
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seq_printf(s, ",noforceuid");
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|
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seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
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if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
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seq_printf(s, ",forcegid");
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else
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seq_printf(s, ",noforcegid");
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|
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cifs_show_address(s, tcon->ses->server);
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|
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if (!tcon->unix_ext)
|
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seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
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cifs_sb->mnt_file_mode,
|
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cifs_sb->mnt_dir_mode);
|
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if (tcon->seal)
|
|
seq_printf(s, ",seal");
|
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if (tcon->nocase)
|
|
seq_printf(s, ",nocase");
|
|
if (tcon->retry)
|
|
seq_printf(s, ",hard");
|
|
if (cifs_sb->prepath)
|
|
seq_printf(s, ",prepath=%s", cifs_sb->prepath);
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
|
|
seq_printf(s, ",posixpaths");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
|
|
seq_printf(s, ",setuids");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
|
|
seq_printf(s, ",serverino");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
|
|
seq_printf(s, ",directio");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
|
|
seq_printf(s, ",nouser_xattr");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
|
|
seq_printf(s, ",mapchars");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
|
|
seq_printf(s, ",sfu");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
|
|
seq_printf(s, ",nobrl");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
|
|
seq_printf(s, ",cifsacl");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
|
|
seq_printf(s, ",dynperm");
|
|
if (m->mnt_sb->s_flags & MS_POSIXACL)
|
|
seq_printf(s, ",acl");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
|
|
seq_printf(s, ",mfsymlinks");
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
|
|
seq_printf(s, ",fsc");
|
|
|
|
seq_printf(s, ",rsize=%d", cifs_sb->rsize);
|
|
seq_printf(s, ",wsize=%d", cifs_sb->wsize);
|
|
/* convert actimeo and display it in seconds */
|
|
seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void cifs_umount_begin(struct super_block *sb)
|
|
{
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
|
|
struct cifsTconInfo *tcon;
|
|
|
|
if (cifs_sb == NULL)
|
|
return;
|
|
|
|
tcon = cifs_sb_master_tcon(cifs_sb);
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
|
|
/* we have other mounts to same share or we have
|
|
already tried to force umount this and woken up
|
|
all waiting network requests, nothing to do */
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return;
|
|
} else if (tcon->tc_count == 1)
|
|
tcon->tidStatus = CifsExiting;
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
/* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
|
|
/* cancel_notify_requests(tcon); */
|
|
if (tcon->ses && tcon->ses->server) {
|
|
cFYI(1, "wake up tasks now - umount begin not complete");
|
|
wake_up_all(&tcon->ses->server->request_q);
|
|
wake_up_all(&tcon->ses->server->response_q);
|
|
msleep(1); /* yield */
|
|
/* we have to kick the requests once more */
|
|
wake_up_all(&tcon->ses->server->response_q);
|
|
msleep(1);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
|
|
{
|
|
/* BB FIXME */
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int cifs_remount(struct super_block *sb, int *flags, char *data)
|
|
{
|
|
*flags |= MS_NODIRATIME;
|
|
return 0;
|
|
}
|
|
|
|
static int cifs_drop_inode(struct inode *inode)
|
|
{
|
|
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
|
|
|
|
/* no serverino => unconditional eviction */
|
|
return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
|
|
generic_drop_inode(inode);
|
|
}
|
|
|
|
static const struct super_operations cifs_super_ops = {
|
|
.put_super = cifs_put_super,
|
|
.statfs = cifs_statfs,
|
|
.alloc_inode = cifs_alloc_inode,
|
|
.destroy_inode = cifs_destroy_inode,
|
|
.drop_inode = cifs_drop_inode,
|
|
.evict_inode = cifs_evict_inode,
|
|
/* .delete_inode = cifs_delete_inode, */ /* Do not need above
|
|
function unless later we add lazy close of inodes or unless the
|
|
kernel forgets to call us with the same number of releases (closes)
|
|
as opens */
|
|
.show_options = cifs_show_options,
|
|
.umount_begin = cifs_umount_begin,
|
|
.remount_fs = cifs_remount,
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
.show_stats = cifs_show_stats,
|
|
#endif
|
|
};
|
|
|
|
static struct dentry *
|
|
cifs_do_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
int rc;
|
|
struct super_block *sb;
|
|
|
|
sb = sget(fs_type, NULL, set_anon_super, NULL);
|
|
|
|
cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
|
|
|
|
if (IS_ERR(sb))
|
|
return ERR_CAST(sb);
|
|
|
|
sb->s_flags = flags;
|
|
|
|
rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
|
|
if (rc) {
|
|
deactivate_locked_super(sb);
|
|
return ERR_PTR(rc);
|
|
}
|
|
sb->s_flags |= MS_ACTIVE;
|
|
return dget(sb->s_root);
|
|
}
|
|
|
|
static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t pos)
|
|
{
|
|
struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
|
|
ssize_t written;
|
|
int rc;
|
|
|
|
written = generic_file_aio_write(iocb, iov, nr_segs, pos);
|
|
|
|
if (CIFS_I(inode)->clientCanCacheAll)
|
|
return written;
|
|
|
|
rc = filemap_fdatawrite(inode->i_mapping);
|
|
if (rc)
|
|
cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
|
|
|
|
return written;
|
|
}
|
|
|
|
static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
|
|
{
|
|
/* origin == SEEK_END => we must revalidate the cached file length */
|
|
if (origin == SEEK_END) {
|
|
int retval;
|
|
|
|
/* some applications poll for the file length in this strange
|
|
way so we must seek to end on non-oplocked files by
|
|
setting the revalidate time to zero */
|
|
CIFS_I(file->f_path.dentry->d_inode)->time = 0;
|
|
|
|
retval = cifs_revalidate_file(file);
|
|
if (retval < 0)
|
|
return (loff_t)retval;
|
|
}
|
|
return generic_file_llseek_unlocked(file, offset, origin);
|
|
}
|
|
|
|
static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
|
|
{
|
|
/* note that this is called by vfs setlease with lock_flocks held
|
|
to protect *lease from going away */
|
|
struct inode *inode = file->f_path.dentry->d_inode;
|
|
struct cifsFileInfo *cfile = file->private_data;
|
|
|
|
if (!(S_ISREG(inode->i_mode)))
|
|
return -EINVAL;
|
|
|
|
/* check if file is oplocked */
|
|
if (((arg == F_RDLCK) &&
|
|
(CIFS_I(inode)->clientCanCacheRead)) ||
|
|
((arg == F_WRLCK) &&
|
|
(CIFS_I(inode)->clientCanCacheAll)))
|
|
return generic_setlease(file, arg, lease);
|
|
else if (tlink_tcon(cfile->tlink)->local_lease &&
|
|
!CIFS_I(inode)->clientCanCacheRead)
|
|
/* If the server claims to support oplock on this
|
|
file, then we still need to check oplock even
|
|
if the local_lease mount option is set, but there
|
|
are servers which do not support oplock for which
|
|
this mount option may be useful if the user
|
|
knows that the file won't be changed on the server
|
|
by anyone else */
|
|
return generic_setlease(file, arg, lease);
|
|
else
|
|
return -EAGAIN;
|
|
}
|
|
|
|
struct file_system_type cifs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "cifs",
|
|
.mount = cifs_do_mount,
|
|
.kill_sb = kill_anon_super,
|
|
/* .fs_flags */
|
|
};
|
|
const struct inode_operations cifs_dir_inode_ops = {
|
|
.create = cifs_create,
|
|
.lookup = cifs_lookup,
|
|
.getattr = cifs_getattr,
|
|
.unlink = cifs_unlink,
|
|
.link = cifs_hardlink,
|
|
.mkdir = cifs_mkdir,
|
|
.rmdir = cifs_rmdir,
|
|
.rename = cifs_rename,
|
|
.permission = cifs_permission,
|
|
/* revalidate:cifs_revalidate, */
|
|
.setattr = cifs_setattr,
|
|
.symlink = cifs_symlink,
|
|
.mknod = cifs_mknod,
|
|
#ifdef CONFIG_CIFS_XATTR
|
|
.setxattr = cifs_setxattr,
|
|
.getxattr = cifs_getxattr,
|
|
.listxattr = cifs_listxattr,
|
|
.removexattr = cifs_removexattr,
|
|
#endif
|
|
};
|
|
|
|
const struct inode_operations cifs_file_inode_ops = {
|
|
/* revalidate:cifs_revalidate, */
|
|
.setattr = cifs_setattr,
|
|
.getattr = cifs_getattr, /* do we need this anymore? */
|
|
.rename = cifs_rename,
|
|
.permission = cifs_permission,
|
|
#ifdef CONFIG_CIFS_XATTR
|
|
.setxattr = cifs_setxattr,
|
|
.getxattr = cifs_getxattr,
|
|
.listxattr = cifs_listxattr,
|
|
.removexattr = cifs_removexattr,
|
|
#endif
|
|
};
|
|
|
|
const struct inode_operations cifs_symlink_inode_ops = {
|
|
.readlink = generic_readlink,
|
|
.follow_link = cifs_follow_link,
|
|
.put_link = cifs_put_link,
|
|
.permission = cifs_permission,
|
|
/* BB add the following two eventually */
|
|
/* revalidate: cifs_revalidate,
|
|
setattr: cifs_notify_change, *//* BB do we need notify change */
|
|
#ifdef CONFIG_CIFS_XATTR
|
|
.setxattr = cifs_setxattr,
|
|
.getxattr = cifs_getxattr,
|
|
.listxattr = cifs_listxattr,
|
|
.removexattr = cifs_removexattr,
|
|
#endif
|
|
};
|
|
|
|
const struct file_operations cifs_file_ops = {
|
|
.read = do_sync_read,
|
|
.write = do_sync_write,
|
|
.aio_read = generic_file_aio_read,
|
|
.aio_write = cifs_file_aio_write,
|
|
.open = cifs_open,
|
|
.release = cifs_close,
|
|
.lock = cifs_lock,
|
|
.fsync = cifs_fsync,
|
|
.flush = cifs_flush,
|
|
.mmap = cifs_file_mmap,
|
|
.splice_read = generic_file_splice_read,
|
|
.llseek = cifs_llseek,
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.unlocked_ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
.setlease = cifs_setlease,
|
|
};
|
|
|
|
const struct file_operations cifs_file_strict_ops = {
|
|
.read = do_sync_read,
|
|
.write = do_sync_write,
|
|
.aio_read = cifs_strict_readv,
|
|
.aio_write = cifs_strict_writev,
|
|
.open = cifs_open,
|
|
.release = cifs_close,
|
|
.lock = cifs_lock,
|
|
.fsync = cifs_strict_fsync,
|
|
.flush = cifs_flush,
|
|
.mmap = cifs_file_strict_mmap,
|
|
.splice_read = generic_file_splice_read,
|
|
.llseek = cifs_llseek,
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.unlocked_ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
.setlease = cifs_setlease,
|
|
};
|
|
|
|
const struct file_operations cifs_file_direct_ops = {
|
|
/* no aio, no readv -
|
|
BB reevaluate whether they can be done with directio, no cache */
|
|
.read = cifs_user_read,
|
|
.write = cifs_user_write,
|
|
.open = cifs_open,
|
|
.release = cifs_close,
|
|
.lock = cifs_lock,
|
|
.fsync = cifs_fsync,
|
|
.flush = cifs_flush,
|
|
.mmap = cifs_file_mmap,
|
|
.splice_read = generic_file_splice_read,
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.unlocked_ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
.llseek = cifs_llseek,
|
|
.setlease = cifs_setlease,
|
|
};
|
|
|
|
const struct file_operations cifs_file_nobrl_ops = {
|
|
.read = do_sync_read,
|
|
.write = do_sync_write,
|
|
.aio_read = generic_file_aio_read,
|
|
.aio_write = cifs_file_aio_write,
|
|
.open = cifs_open,
|
|
.release = cifs_close,
|
|
.fsync = cifs_fsync,
|
|
.flush = cifs_flush,
|
|
.mmap = cifs_file_mmap,
|
|
.splice_read = generic_file_splice_read,
|
|
.llseek = cifs_llseek,
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.unlocked_ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
.setlease = cifs_setlease,
|
|
};
|
|
|
|
const struct file_operations cifs_file_strict_nobrl_ops = {
|
|
.read = do_sync_read,
|
|
.write = do_sync_write,
|
|
.aio_read = cifs_strict_readv,
|
|
.aio_write = cifs_strict_writev,
|
|
.open = cifs_open,
|
|
.release = cifs_close,
|
|
.fsync = cifs_strict_fsync,
|
|
.flush = cifs_flush,
|
|
.mmap = cifs_file_strict_mmap,
|
|
.splice_read = generic_file_splice_read,
|
|
.llseek = cifs_llseek,
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.unlocked_ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
.setlease = cifs_setlease,
|
|
};
|
|
|
|
const struct file_operations cifs_file_direct_nobrl_ops = {
|
|
/* no mmap, no aio, no readv -
|
|
BB reevaluate whether they can be done with directio, no cache */
|
|
.read = cifs_user_read,
|
|
.write = cifs_user_write,
|
|
.open = cifs_open,
|
|
.release = cifs_close,
|
|
.fsync = cifs_fsync,
|
|
.flush = cifs_flush,
|
|
.mmap = cifs_file_mmap,
|
|
.splice_read = generic_file_splice_read,
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.unlocked_ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
.llseek = cifs_llseek,
|
|
.setlease = cifs_setlease,
|
|
};
|
|
|
|
const struct file_operations cifs_dir_ops = {
|
|
.readdir = cifs_readdir,
|
|
.release = cifs_closedir,
|
|
.read = generic_read_dir,
|
|
.unlocked_ioctl = cifs_ioctl,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static void
|
|
cifs_init_once(void *inode)
|
|
{
|
|
struct cifsInodeInfo *cifsi = inode;
|
|
|
|
inode_init_once(&cifsi->vfs_inode);
|
|
INIT_LIST_HEAD(&cifsi->lockList);
|
|
}
|
|
|
|
static int
|
|
cifs_init_inodecache(void)
|
|
{
|
|
cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
|
|
sizeof(struct cifsInodeInfo),
|
|
0, (SLAB_RECLAIM_ACCOUNT|
|
|
SLAB_MEM_SPREAD),
|
|
cifs_init_once);
|
|
if (cifs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cifs_destroy_inodecache(void)
|
|
{
|
|
kmem_cache_destroy(cifs_inode_cachep);
|
|
}
|
|
|
|
static int
|
|
cifs_init_request_bufs(void)
|
|
{
|
|
if (CIFSMaxBufSize < 8192) {
|
|
/* Buffer size can not be smaller than 2 * PATH_MAX since maximum
|
|
Unicode path name has to fit in any SMB/CIFS path based frames */
|
|
CIFSMaxBufSize = 8192;
|
|
} else if (CIFSMaxBufSize > 1024*127) {
|
|
CIFSMaxBufSize = 1024 * 127;
|
|
} else {
|
|
CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
|
|
}
|
|
/* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
|
|
cifs_req_cachep = kmem_cache_create("cifs_request",
|
|
CIFSMaxBufSize +
|
|
MAX_CIFS_HDR_SIZE, 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (cifs_req_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (cifs_min_rcv < 1)
|
|
cifs_min_rcv = 1;
|
|
else if (cifs_min_rcv > 64) {
|
|
cifs_min_rcv = 64;
|
|
cERROR(1, "cifs_min_rcv set to maximum (64)");
|
|
}
|
|
|
|
cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
|
|
cifs_req_cachep);
|
|
|
|
if (cifs_req_poolp == NULL) {
|
|
kmem_cache_destroy(cifs_req_cachep);
|
|
return -ENOMEM;
|
|
}
|
|
/* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
|
|
almost all handle based requests (but not write response, nor is it
|
|
sufficient for path based requests). A smaller size would have
|
|
been more efficient (compacting multiple slab items on one 4k page)
|
|
for the case in which debug was on, but this larger size allows
|
|
more SMBs to use small buffer alloc and is still much more
|
|
efficient to alloc 1 per page off the slab compared to 17K (5page)
|
|
alloc of large cifs buffers even when page debugging is on */
|
|
cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
|
|
MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
|
|
NULL);
|
|
if (cifs_sm_req_cachep == NULL) {
|
|
mempool_destroy(cifs_req_poolp);
|
|
kmem_cache_destroy(cifs_req_cachep);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (cifs_min_small < 2)
|
|
cifs_min_small = 2;
|
|
else if (cifs_min_small > 256) {
|
|
cifs_min_small = 256;
|
|
cFYI(1, "cifs_min_small set to maximum (256)");
|
|
}
|
|
|
|
cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
|
|
cifs_sm_req_cachep);
|
|
|
|
if (cifs_sm_req_poolp == NULL) {
|
|
mempool_destroy(cifs_req_poolp);
|
|
kmem_cache_destroy(cifs_req_cachep);
|
|
kmem_cache_destroy(cifs_sm_req_cachep);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cifs_destroy_request_bufs(void)
|
|
{
|
|
mempool_destroy(cifs_req_poolp);
|
|
kmem_cache_destroy(cifs_req_cachep);
|
|
mempool_destroy(cifs_sm_req_poolp);
|
|
kmem_cache_destroy(cifs_sm_req_cachep);
|
|
}
|
|
|
|
static int
|
|
cifs_init_mids(void)
|
|
{
|
|
cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
|
|
sizeof(struct mid_q_entry), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (cifs_mid_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* 3 is a reasonable minimum number of simultaneous operations */
|
|
cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
|
|
if (cifs_mid_poolp == NULL) {
|
|
kmem_cache_destroy(cifs_mid_cachep);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cifs_destroy_mids(void)
|
|
{
|
|
mempool_destroy(cifs_mid_poolp);
|
|
kmem_cache_destroy(cifs_mid_cachep);
|
|
}
|
|
|
|
static int __init
|
|
init_cifs(void)
|
|
{
|
|
int rc = 0;
|
|
cifs_proc_init();
|
|
INIT_LIST_HEAD(&cifs_tcp_ses_list);
|
|
#ifdef CONFIG_CIFS_EXPERIMENTAL
|
|
INIT_LIST_HEAD(&GlobalDnotifyReqList);
|
|
INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
|
|
#endif
|
|
/*
|
|
* Initialize Global counters
|
|
*/
|
|
atomic_set(&sesInfoAllocCount, 0);
|
|
atomic_set(&tconInfoAllocCount, 0);
|
|
atomic_set(&tcpSesAllocCount, 0);
|
|
atomic_set(&tcpSesReconnectCount, 0);
|
|
atomic_set(&tconInfoReconnectCount, 0);
|
|
|
|
atomic_set(&bufAllocCount, 0);
|
|
atomic_set(&smBufAllocCount, 0);
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
atomic_set(&totBufAllocCount, 0);
|
|
atomic_set(&totSmBufAllocCount, 0);
|
|
#endif /* CONFIG_CIFS_STATS2 */
|
|
|
|
atomic_set(&midCount, 0);
|
|
GlobalCurrentXid = 0;
|
|
GlobalTotalActiveXid = 0;
|
|
GlobalMaxActiveXid = 0;
|
|
spin_lock_init(&cifs_tcp_ses_lock);
|
|
spin_lock_init(&cifs_file_list_lock);
|
|
spin_lock_init(&GlobalMid_Lock);
|
|
|
|
if (cifs_max_pending < 2) {
|
|
cifs_max_pending = 2;
|
|
cFYI(1, "cifs_max_pending set to min of 2");
|
|
} else if (cifs_max_pending > 256) {
|
|
cifs_max_pending = 256;
|
|
cFYI(1, "cifs_max_pending set to max of 256");
|
|
}
|
|
|
|
rc = cifs_fscache_register();
|
|
if (rc)
|
|
goto out_clean_proc;
|
|
|
|
rc = cifs_init_inodecache();
|
|
if (rc)
|
|
goto out_unreg_fscache;
|
|
|
|
rc = cifs_init_mids();
|
|
if (rc)
|
|
goto out_destroy_inodecache;
|
|
|
|
rc = cifs_init_request_bufs();
|
|
if (rc)
|
|
goto out_destroy_mids;
|
|
|
|
rc = register_filesystem(&cifs_fs_type);
|
|
if (rc)
|
|
goto out_destroy_request_bufs;
|
|
#ifdef CONFIG_CIFS_UPCALL
|
|
rc = register_key_type(&cifs_spnego_key_type);
|
|
if (rc)
|
|
goto out_unregister_filesystem;
|
|
#endif
|
|
|
|
return 0;
|
|
|
|
#ifdef CONFIG_CIFS_UPCALL
|
|
out_unregister_filesystem:
|
|
unregister_filesystem(&cifs_fs_type);
|
|
#endif
|
|
out_destroy_request_bufs:
|
|
cifs_destroy_request_bufs();
|
|
out_destroy_mids:
|
|
cifs_destroy_mids();
|
|
out_destroy_inodecache:
|
|
cifs_destroy_inodecache();
|
|
out_unreg_fscache:
|
|
cifs_fscache_unregister();
|
|
out_clean_proc:
|
|
cifs_proc_clean();
|
|
return rc;
|
|
}
|
|
|
|
static void __exit
|
|
exit_cifs(void)
|
|
{
|
|
cFYI(DBG2, "exit_cifs");
|
|
cifs_proc_clean();
|
|
cifs_fscache_unregister();
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
cifs_dfs_release_automount_timer();
|
|
#endif
|
|
#ifdef CONFIG_CIFS_UPCALL
|
|
unregister_key_type(&cifs_spnego_key_type);
|
|
#endif
|
|
unregister_filesystem(&cifs_fs_type);
|
|
cifs_destroy_inodecache();
|
|
cifs_destroy_mids();
|
|
cifs_destroy_request_bufs();
|
|
}
|
|
|
|
MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
|
|
MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */
|
|
MODULE_DESCRIPTION
|
|
("VFS to access servers complying with the SNIA CIFS Specification "
|
|
"e.g. Samba and Windows");
|
|
MODULE_VERSION(CIFS_VERSION);
|
|
module_init(init_cifs)
|
|
module_exit(exit_cifs)
|