![Trond Myklebust](/assets/img/avatar_default.png)
Allow filesystems to decide to perform pre-umount processing whether or not MNT_FORCE is set. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
1048 lines
27 KiB
C
1048 lines
27 KiB
C
/*
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* fs/cifs/cifsfs.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2004
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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 "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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#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
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#ifdef CONFIG_CIFS_QUOTA
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static struct quotactl_ops cifs_quotactl_ops;
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#endif
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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 experimEnabled = 0;
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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 extended_security = 0;
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unsigned int ntlmv2_support = 0;
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unsigned int sign_CIFS_PDUs = 1;
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extern struct task_struct * oplockThread; /* remove sparse warning */
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struct task_struct * oplockThread = NULL;
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extern struct task_struct * dnotifyThread; /* remove sparse warning */
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struct task_struct * dnotifyThread = NULL;
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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). 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: 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 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. Default: 50 Range: 2 to 256");
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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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extern kmem_cache_t *cifs_oplock_cachep;
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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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sb->s_flags |= MS_NODIRATIME; /* and probably even 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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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,
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("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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/* if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
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sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
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#ifdef CONFIG_CIFS_QUOTA
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sb->s_qcop = &cifs_quotactl_ops;
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#endif
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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 = iget(sb, ROOT_I);
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if (!inode) {
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rc = -ENOMEM;
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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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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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out_mount_failed:
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if(cifs_sb) {
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if(cifs_sb->local_nls)
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unload_nls(cifs_sb->local_nls);
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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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}
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unload_nls(cifs_sb->local_nls);
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kfree(cifs_sb);
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return;
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}
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static int
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cifs_statfs(struct super_block *sb, struct kstatfs *buf)
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{
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int xid;
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int rc = -EOPNOTSUPP;
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struct cifs_sb_info *cifs_sb;
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struct cifsTconInfo *pTcon;
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xid = GetXid();
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cifs_sb = CIFS_SB(sb);
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pTcon = cifs_sb->tcon;
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buf->f_type = CIFS_MAGIC_NUMBER;
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/* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
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buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
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presumably be total path, but note
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that some servers (includinng Samba 3)
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have a shorter maximum path */
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buf->f_files = 0; /* undefined */
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buf->f_ffree = 0; /* unlimited */
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#ifdef CONFIG_CIFS_EXPERIMENTAL
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/* BB we could add a second check for a QFS Unix capability bit */
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/* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
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if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
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le64_to_cpu(pTcon->fsUnixInfo.Capability)))
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rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
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/* Only need to call the old QFSInfo if failed
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on newer one */
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if(rc)
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#endif /* CIFS_EXPERIMENTAL */
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rc = CIFSSMBQFSInfo(xid, pTcon, buf);
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/* Old Windows servers do not support level 103, retry with level
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one if old server failed the previous call */
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if(rc)
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rc = SMBOldQFSInfo(xid, pTcon, buf);
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/*
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int f_type;
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__fsid_t f_fsid;
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int f_namelen; */
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/* BB get from info in tcon struct at mount time call to QFSAttrInfo */
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FreeXid(xid);
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return 0; /* always return success? what if volume is no
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longer available? */
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}
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static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
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{
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struct cifs_sb_info *cifs_sb;
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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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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, NULL);
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}
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static kmem_cache_t *cifs_inode_cachep;
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static kmem_cache_t *cifs_req_cachep;
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static kmem_cache_t *cifs_mid_cachep;
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kmem_cache_t *cifs_oplock_cachep;
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static kmem_cache_t *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, SLAB_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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atomic_set(&cifs_inode->inUse, 0);
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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_inode->clientCanCacheRead = FALSE;
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cifs_inode->clientCanCacheAll = FALSE;
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cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
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cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
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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
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cifs_destroy_inode(struct inode *inode)
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{
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kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
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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;
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cifs_sb = CIFS_SB(m->mnt_sb);
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if (cifs_sb) {
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if (cifs_sb->tcon) {
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seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
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if (cifs_sb->tcon->ses) {
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if (cifs_sb->tcon->ses->userName)
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seq_printf(s, ",username=%s",
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cifs_sb->tcon->ses->userName);
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if(cifs_sb->tcon->ses->domainName)
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seq_printf(s, ",domain=%s",
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cifs_sb->tcon->ses->domainName);
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}
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}
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seq_printf(s, ",rsize=%d",cifs_sb->rsize);
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seq_printf(s, ",wsize=%d",cifs_sb->wsize);
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}
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return 0;
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}
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#ifdef CONFIG_CIFS_QUOTA
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int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
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struct fs_disk_quota * pdquota)
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{
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int xid;
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int rc = 0;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct cifsTconInfo *pTcon;
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if(cifs_sb)
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pTcon = cifs_sb->tcon;
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else
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return -EIO;
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xid = GetXid();
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if(pTcon) {
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cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
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} else {
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return -EIO;
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}
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FreeXid(xid);
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return rc;
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}
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int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
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struct fs_disk_quota * pdquota)
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{
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int xid;
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int rc = 0;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct cifsTconInfo *pTcon;
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if(cifs_sb)
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pTcon = cifs_sb->tcon;
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else
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return -EIO;
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xid = GetXid();
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if(pTcon) {
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cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
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} else {
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rc = -EIO;
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}
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FreeXid(xid);
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return rc;
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}
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int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
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{
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int xid;
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int rc = 0;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct cifsTconInfo *pTcon;
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if(cifs_sb)
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pTcon = cifs_sb->tcon;
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else
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return -EIO;
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xid = GetXid();
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if(pTcon) {
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cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
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} else {
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rc = -EIO;
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}
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FreeXid(xid);
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return rc;
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}
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int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
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{
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int xid;
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int rc = 0;
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struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
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struct cifsTconInfo *pTcon;
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if(cifs_sb) {
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pTcon = cifs_sb->tcon;
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} else {
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return -EIO;
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}
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xid = GetXid();
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if(pTcon) {
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cFYI(1,("pqstats %p",qstats));
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} else {
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rc = -EIO;
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}
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FreeXid(xid);
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return rc;
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}
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static struct quotactl_ops cifs_quotactl_ops = {
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.set_xquota = cifs_xquota_set,
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.get_xquota = cifs_xquota_set,
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.set_xstate = cifs_xstate_set,
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.get_xstate = cifs_xstate_get,
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};
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#endif
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#ifdef CONFIG_CIFS_EXPERIMENTAL
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static void cifs_umount_begin(struct vfsmount * vfsmnt, int flags)
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{
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struct cifs_sb_info *cifs_sb;
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struct cifsTconInfo * tcon;
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if (!(flags & MNT_FORCE))
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return;
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cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
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if(cifs_sb == NULL)
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return;
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tcon = cifs_sb->tcon;
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if(tcon == NULL)
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return;
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down(&tcon->tconSem);
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if (atomic_read(&tcon->useCount) == 1)
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tcon->tidStatus = CifsExiting;
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up(&tcon->tconSem);
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/* cancel_brl_requests(tcon); */
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/* cancel_notify_requests(tcon); */
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if(tcon->ses && tcon->ses->server)
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{
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cFYI(1,("wake up tasks now - umount begin not complete"));
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wake_up_all(&tcon->ses->server->request_q);
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wake_up_all(&tcon->ses->server->response_q);
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msleep(1); /* yield */
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/* we have to kick the requests once more */
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wake_up_all(&tcon->ses->server->response_q);
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msleep(1);
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}
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/* BB FIXME - finish add checks for tidStatus BB */
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return;
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}
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#endif
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static int cifs_remount(struct super_block *sb, int *flags, char *data)
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{
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*flags |= MS_NODIRATIME;
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return 0;
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}
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struct super_operations cifs_super_ops = {
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.read_inode = cifs_read_inode,
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.put_super = cifs_put_super,
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.statfs = cifs_statfs,
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.alloc_inode = cifs_alloc_inode,
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.destroy_inode = cifs_destroy_inode,
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/* .drop_inode = generic_delete_inode,
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.delete_inode = cifs_delete_inode, *//* Do not need the above two functions
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unless later we add lazy close of inodes or unless the kernel forgets to call
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us with the same number of releases (closes) as opens */
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.show_options = cifs_show_options,
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#ifdef CONFIG_CIFS_EXPERIMENTAL
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.umount_begin = cifs_umount_begin,
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#endif
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.remount_fs = cifs_remount,
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};
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static struct super_block *
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cifs_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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{
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int rc;
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struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
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cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
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if (IS_ERR(sb))
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return sb;
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sb->s_flags = flags;
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rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
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if (rc) {
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up_write(&sb->s_umount);
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|
deactivate_super(sb);
|
|
return ERR_PTR(rc);
|
|
}
|
|
sb->s_flags |= MS_ACTIVE;
|
|
return sb;
|
|
}
|
|
|
|
static ssize_t cifs_file_writev(struct file *file, const struct iovec *iov,
|
|
unsigned long nr_segs, loff_t *ppos)
|
|
{
|
|
struct inode *inode = file->f_dentry->d_inode;
|
|
ssize_t written;
|
|
|
|
written = generic_file_writev(file, iov, nr_segs, ppos);
|
|
if (!CIFS_I(inode)->clientCanCacheAll)
|
|
filemap_fdatawrite(inode->i_mapping);
|
|
return written;
|
|
}
|
|
|
|
static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
|
|
size_t count, loff_t pos)
|
|
{
|
|
struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
|
|
ssize_t written;
|
|
|
|
written = generic_file_aio_write(iocb, buf, count, pos);
|
|
if (!CIFS_I(inode)->clientCanCacheAll)
|
|
filemap_fdatawrite(inode->i_mapping);
|
|
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 == 2) {
|
|
int retval = cifs_revalidate(file->f_dentry);
|
|
if (retval < 0)
|
|
return (loff_t)retval;
|
|
}
|
|
return remote_llseek(file, offset, origin);
|
|
}
|
|
|
|
static struct file_system_type cifs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "cifs",
|
|
.get_sb = cifs_get_sb,
|
|
.kill_sb = kill_anon_super,
|
|
/* .fs_flags */
|
|
};
|
|
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
|
|
};
|
|
|
|
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
|
|
};
|
|
|
|
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,
|
|
.readv = generic_file_readv,
|
|
.writev = cifs_file_writev,
|
|
.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,
|
|
.sendfile = generic_file_sendfile,
|
|
.llseek = cifs_llseek,
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
|
|
#ifdef CONFIG_CIFS_EXPERIMENTAL
|
|
.dir_notify = cifs_dir_notify,
|
|
#endif /* CONFIG_CIFS_EXPERIMENTAL */
|
|
};
|
|
|
|
const struct file_operations cifs_file_direct_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,
|
|
.lock = cifs_lock,
|
|
.fsync = cifs_fsync,
|
|
.flush = cifs_flush,
|
|
.sendfile = generic_file_sendfile, /* BB removeme BB */
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
.llseek = cifs_llseek,
|
|
#ifdef CONFIG_CIFS_EXPERIMENTAL
|
|
.dir_notify = cifs_dir_notify,
|
|
#endif /* CONFIG_CIFS_EXPERIMENTAL */
|
|
};
|
|
const struct file_operations cifs_file_nobrl_ops = {
|
|
.read = do_sync_read,
|
|
.write = do_sync_write,
|
|
.readv = generic_file_readv,
|
|
.writev = cifs_file_writev,
|
|
.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,
|
|
.sendfile = generic_file_sendfile,
|
|
.llseek = cifs_llseek,
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
|
|
#ifdef CONFIG_CIFS_EXPERIMENTAL
|
|
.dir_notify = cifs_dir_notify,
|
|
#endif /* CONFIG_CIFS_EXPERIMENTAL */
|
|
};
|
|
|
|
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,
|
|
.sendfile = generic_file_sendfile, /* BB removeme BB */
|
|
#ifdef CONFIG_CIFS_POSIX
|
|
.ioctl = cifs_ioctl,
|
|
#endif /* CONFIG_CIFS_POSIX */
|
|
.llseek = cifs_llseek,
|
|
#ifdef CONFIG_CIFS_EXPERIMENTAL
|
|
.dir_notify = cifs_dir_notify,
|
|
#endif /* CONFIG_CIFS_EXPERIMENTAL */
|
|
};
|
|
|
|
const struct file_operations cifs_dir_ops = {
|
|
.readdir = cifs_readdir,
|
|
.release = cifs_closedir,
|
|
.read = generic_read_dir,
|
|
#ifdef CONFIG_CIFS_EXPERIMENTAL
|
|
.dir_notify = cifs_dir_notify,
|
|
#endif /* CONFIG_CIFS_EXPERIMENTAL */
|
|
.ioctl = cifs_ioctl,
|
|
};
|
|
|
|
static void
|
|
cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
|
|
{
|
|
struct cifsInodeInfo *cifsi = inode;
|
|
|
|
if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
|
|
SLAB_CTOR_CONSTRUCTOR) {
|
|
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, NULL);
|
|
if (cifs_inode_cachep == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cifs_destroy_inodecache(void)
|
|
{
|
|
if (kmem_cache_destroy(cifs_inode_cachep))
|
|
printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
|
|
}
|
|
|
|
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, 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, 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);
|
|
if (kmem_cache_destroy(cifs_req_cachep))
|
|
printk(KERN_WARNING
|
|
"cifs_destroy_request_cache: error not all structures were freed\n");
|
|
mempool_destroy(cifs_sm_req_poolp);
|
|
if (kmem_cache_destroy(cifs_sm_req_cachep))
|
|
printk(KERN_WARNING
|
|
"cifs_destroy_request_cache: cifs_small_rq free error\n");
|
|
}
|
|
|
|
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, 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;
|
|
}
|
|
|
|
cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
|
|
sizeof (struct oplock_q_entry), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL, NULL);
|
|
if (cifs_oplock_cachep == NULL) {
|
|
kmem_cache_destroy(cifs_mid_cachep);
|
|
mempool_destroy(cifs_mid_poolp);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cifs_destroy_mids(void)
|
|
{
|
|
mempool_destroy(cifs_mid_poolp);
|
|
if (kmem_cache_destroy(cifs_mid_cachep))
|
|
printk(KERN_WARNING
|
|
"cifs_destroy_mids: error not all structures were freed\n");
|
|
|
|
if (kmem_cache_destroy(cifs_oplock_cachep))
|
|
printk(KERN_WARNING
|
|
"error not all oplock structures were freed\n");
|
|
}
|
|
|
|
static int cifs_oplock_thread(void * dummyarg)
|
|
{
|
|
struct oplock_q_entry * oplock_item;
|
|
struct cifsTconInfo *pTcon;
|
|
struct inode * inode;
|
|
__u16 netfid;
|
|
int rc;
|
|
|
|
do {
|
|
if (try_to_freeze())
|
|
continue;
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
if(list_empty(&GlobalOplock_Q)) {
|
|
spin_unlock(&GlobalMid_Lock);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(39*HZ);
|
|
} else {
|
|
oplock_item = list_entry(GlobalOplock_Q.next,
|
|
struct oplock_q_entry, qhead);
|
|
if(oplock_item) {
|
|
cFYI(1,("found oplock item to write out"));
|
|
pTcon = oplock_item->tcon;
|
|
inode = oplock_item->pinode;
|
|
netfid = oplock_item->netfid;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
DeleteOplockQEntry(oplock_item);
|
|
/* can not grab inode sem here since it would
|
|
deadlock when oplock received on delete
|
|
since vfs_unlink holds the i_mutex across
|
|
the call */
|
|
/* mutex_lock(&inode->i_mutex);*/
|
|
if (S_ISREG(inode->i_mode)) {
|
|
rc = filemap_fdatawrite(inode->i_mapping);
|
|
if(CIFS_I(inode)->clientCanCacheRead == 0) {
|
|
filemap_fdatawait(inode->i_mapping);
|
|
invalidate_remote_inode(inode);
|
|
}
|
|
} else
|
|
rc = 0;
|
|
/* mutex_unlock(&inode->i_mutex);*/
|
|
if (rc)
|
|
CIFS_I(inode)->write_behind_rc = rc;
|
|
cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
|
|
|
|
/* releasing a stale oplock after recent reconnection
|
|
of smb session using a now incorrect file
|
|
handle is not a data integrity issue but do
|
|
not bother sending an oplock release if session
|
|
to server still is disconnected since oplock
|
|
already released by the server in that case */
|
|
if(pTcon->tidStatus != CifsNeedReconnect) {
|
|
rc = CIFSSMBLock(0, pTcon, netfid,
|
|
0 /* len */ , 0 /* offset */, 0,
|
|
0, LOCKING_ANDX_OPLOCK_RELEASE,
|
|
0 /* wait flag */);
|
|
cFYI(1,("Oplock release rc = %d ",rc));
|
|
}
|
|
} else
|
|
spin_unlock(&GlobalMid_Lock);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(1); /* yield in case q were corrupt */
|
|
}
|
|
} while (!kthread_should_stop());
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cifs_dnotify_thread(void * dummyarg)
|
|
{
|
|
struct list_head *tmp;
|
|
struct cifsSesInfo *ses;
|
|
|
|
do {
|
|
if(try_to_freeze())
|
|
continue;
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule_timeout(15*HZ);
|
|
read_lock(&GlobalSMBSeslock);
|
|
/* check if any stuck requests that need
|
|
to be woken up and wakeq so the
|
|
thread can wake up and error out */
|
|
list_for_each(tmp, &GlobalSMBSessionList) {
|
|
ses = list_entry(tmp, struct cifsSesInfo,
|
|
cifsSessionList);
|
|
if(ses && ses->server &&
|
|
atomic_read(&ses->server->inFlight))
|
|
wake_up_all(&ses->server->response_q);
|
|
}
|
|
read_unlock(&GlobalSMBSeslock);
|
|
} while (!kthread_should_stop());
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init
|
|
init_cifs(void)
|
|
{
|
|
int rc = 0;
|
|
#ifdef CONFIG_PROC_FS
|
|
cifs_proc_init();
|
|
#endif
|
|
INIT_LIST_HEAD(&GlobalServerList); /* BB not implemented yet */
|
|
INIT_LIST_HEAD(&GlobalSMBSessionList);
|
|
INIT_LIST_HEAD(&GlobalTreeConnectionList);
|
|
INIT_LIST_HEAD(&GlobalOplock_Q);
|
|
#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;
|
|
rwlock_init(&GlobalSMBSeslock);
|
|
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_init_inodecache();
|
|
if (rc)
|
|
goto out_clean_proc;
|
|
|
|
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;
|
|
|
|
oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
|
|
if (IS_ERR(oplockThread)) {
|
|
rc = PTR_ERR(oplockThread);
|
|
cERROR(1,("error %d create oplock thread", rc));
|
|
goto out_unregister_filesystem;
|
|
}
|
|
|
|
dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
|
|
if (IS_ERR(dnotifyThread)) {
|
|
rc = PTR_ERR(dnotifyThread);
|
|
cERROR(1,("error %d create dnotify thread", rc));
|
|
goto out_stop_oplock_thread;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_stop_oplock_thread:
|
|
kthread_stop(oplockThread);
|
|
out_unregister_filesystem:
|
|
unregister_filesystem(&cifs_fs_type);
|
|
out_destroy_request_bufs:
|
|
cifs_destroy_request_bufs();
|
|
out_destroy_mids:
|
|
cifs_destroy_mids();
|
|
out_destroy_inodecache:
|
|
cifs_destroy_inodecache();
|
|
out_clean_proc:
|
|
#ifdef CONFIG_PROC_FS
|
|
cifs_proc_clean();
|
|
#endif
|
|
return rc;
|
|
}
|
|
|
|
static void __exit
|
|
exit_cifs(void)
|
|
{
|
|
cFYI(0, ("In unregister ie exit_cifs"));
|
|
#ifdef CONFIG_PROC_FS
|
|
cifs_proc_clean();
|
|
#endif
|
|
unregister_filesystem(&cifs_fs_type);
|
|
cifs_destroy_inodecache();
|
|
cifs_destroy_mids();
|
|
cifs_destroy_request_bufs();
|
|
kthread_stop(oplockThread);
|
|
kthread_stop(dnotifyThread);
|
|
}
|
|
|
|
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)
|