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-rw-r--r--fs/cifs/cifsfs.c913
1 files changed, 913 insertions, 0 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
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+++ b/fs/cifs/cifsfs.c
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+/*
+ * fs/cifs/cifsfs.c
+ *
+ * Copyright (C) International Business Machines Corp., 2002,2004
+ * Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ * Common Internet FileSystem (CIFS) client
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/* Note that BB means BUGBUG (ie something to fix eventually) */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/seq_file.h>
+#include <linux/vfs.h>
+#include <linux/mempool.h>
+#include "cifsfs.h"
+#include "cifspdu.h"
+#define DECLARE_GLOBALS_HERE
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "cifs_fs_sb.h"
+#include <linux/mm.h>
+#define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */
+
+#ifdef CONFIG_CIFS_QUOTA
+static struct quotactl_ops cifs_quotactl_ops;
+#endif
+
+int cifsFYI = 0;
+int cifsERROR = 1;
+int traceSMB = 0;
+unsigned int oplockEnabled = 1;
+unsigned int experimEnabled = 0;
+unsigned int linuxExtEnabled = 1;
+unsigned int lookupCacheEnabled = 1;
+unsigned int multiuser_mount = 0;
+unsigned int extended_security = 0;
+unsigned int ntlmv2_support = 0;
+unsigned int sign_CIFS_PDUs = 1;
+extern struct task_struct * oplockThread; /* remove sparse warning */
+struct task_struct * oplockThread = NULL;
+unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
+module_param(CIFSMaxBufSize, int, 0);
+MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
+unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
+module_param(cifs_min_rcv, int, 0);
+MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
+unsigned int cifs_min_small = 30;
+module_param(cifs_min_small, int, 0);
+MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
+unsigned int cifs_max_pending = CIFS_MAX_REQ;
+module_param(cifs_max_pending, int, 0);
+MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
+
+static DECLARE_COMPLETION(cifs_oplock_exited);
+
+extern mempool_t *cifs_sm_req_poolp;
+extern mempool_t *cifs_req_poolp;
+extern mempool_t *cifs_mid_poolp;
+
+extern kmem_cache_t *cifs_oplock_cachep;
+
+static int
+cifs_read_super(struct super_block *sb, void *data,
+ const char *devname, int silent)
+{
+ struct inode *inode;
+ struct cifs_sb_info *cifs_sb;
+ int rc = 0;
+
+ sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
+ sb->s_fs_info = kmalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
+ cifs_sb = CIFS_SB(sb);
+ if(cifs_sb == NULL)
+ return -ENOMEM;
+ else
+ memset(cifs_sb,0,sizeof(struct cifs_sb_info));
+
+
+ rc = cifs_mount(sb, cifs_sb, data, devname);
+
+ if (rc) {
+ if (!silent)
+ cERROR(1,
+ ("cifs_mount failed w/return code = %d", rc));
+ goto out_mount_failed;
+ }
+
+ sb->s_magic = CIFS_MAGIC_NUMBER;
+ sb->s_op = &cifs_super_ops;
+/* if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
+ sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
+#ifdef CONFIG_CIFS_QUOTA
+ sb->s_qcop = &cifs_quotactl_ops;
+#endif
+ sb->s_blocksize = CIFS_MAX_MSGSIZE;
+ sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
+ inode = iget(sb, ROOT_I);
+
+ if (!inode) {
+ rc = -ENOMEM;
+ goto out_no_root;
+ }
+
+ sb->s_root = d_alloc_root(inode);
+
+ if (!sb->s_root) {
+ rc = -ENOMEM;
+ goto out_no_root;
+ }
+
+ return 0;
+
+out_no_root:
+ cERROR(1, ("cifs_read_super: get root inode failed"));
+ if (inode)
+ iput(inode);
+
+out_mount_failed:
+ if(cifs_sb) {
+ if(cifs_sb->local_nls)
+ unload_nls(cifs_sb->local_nls);
+ kfree(cifs_sb);
+ }
+ return rc;
+}
+
+static void
+cifs_put_super(struct super_block *sb)
+{
+ int rc = 0;
+ struct cifs_sb_info *cifs_sb;
+
+ cFYI(1, ("In cifs_put_super"));
+ cifs_sb = CIFS_SB(sb);
+ if(cifs_sb == NULL) {
+ cFYI(1,("Empty cifs superblock info passed to unmount"));
+ return;
+ }
+ rc = cifs_umount(sb, cifs_sb);
+ if (rc) {
+ cERROR(1, ("cifs_umount failed with return code %d", rc));
+ }
+ unload_nls(cifs_sb->local_nls);
+ kfree(cifs_sb);
+ return;
+}
+
+static int
+cifs_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ int xid, rc = -EOPNOTSUPP;
+ struct cifs_sb_info *cifs_sb;
+ struct cifsTconInfo *pTcon;
+
+ xid = GetXid();
+
+ cifs_sb = CIFS_SB(sb);
+ pTcon = cifs_sb->tcon;
+
+ buf->f_type = CIFS_MAGIC_NUMBER;
+
+ /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
+ buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would presumably
+ be length of total path, note that some servers may be
+ able to support more than this, but best to be safe
+ since Win2k and others can not handle very long filenames */
+ buf->f_files = 0; /* undefined */
+ buf->f_ffree = 0; /* unlimited */
+
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+/* BB we could add a second check for a QFS Unix capability bit */
+ if (pTcon->ses->capabilities & CAP_UNIX)
+ rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf, cifs_sb->local_nls);
+
+ /* Only need to call the old QFSInfo if failed
+ on newer one */
+ if(rc)
+#endif /* CIFS_EXPERIMENTAL */
+ rc = CIFSSMBQFSInfo(xid, pTcon, buf, cifs_sb->local_nls);
+
+ /*
+ int f_type;
+ __fsid_t f_fsid;
+ int f_namelen; */
+ /* BB get from info put in tcon struct at mount time with call to QFSAttrInfo */
+ FreeXid(xid);
+ return 0; /* always return success? what if volume is no longer available? */
+}
+
+static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
+{
+ struct cifs_sb_info *cifs_sb;
+
+ cifs_sb = CIFS_SB(inode->i_sb);
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
+ return 0;
+ } else /* file mode might have been restricted at mount time
+ on the client (above and beyond ACL on servers) for
+ servers which do not support setting and viewing mode bits,
+ so allowing client to check permissions is useful */
+ return generic_permission(inode, mask, NULL);
+}
+
+static kmem_cache_t *cifs_inode_cachep;
+static kmem_cache_t *cifs_req_cachep;
+static kmem_cache_t *cifs_mid_cachep;
+kmem_cache_t *cifs_oplock_cachep;
+static kmem_cache_t *cifs_sm_req_cachep;
+mempool_t *cifs_sm_req_poolp;
+mempool_t *cifs_req_poolp;
+mempool_t *cifs_mid_poolp;
+
+static struct inode *
+cifs_alloc_inode(struct super_block *sb)
+{
+ struct cifsInodeInfo *cifs_inode;
+ cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
+ if (!cifs_inode)
+ return NULL;
+ cifs_inode->cifsAttrs = 0x20; /* default */
+ atomic_set(&cifs_inode->inUse, 0);
+ cifs_inode->time = 0;
+ /* Until the file is open and we have gotten oplock
+ info back from the server, can not assume caching of
+ file data or metadata */
+ cifs_inode->clientCanCacheRead = FALSE;
+ cifs_inode->clientCanCacheAll = FALSE;
+ cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
+ cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
+
+ INIT_LIST_HEAD(&cifs_inode->openFileList);
+ return &cifs_inode->vfs_inode;
+}
+
+static void
+cifs_destroy_inode(struct inode *inode)
+{
+ kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
+}
+
+/*
+ * cifs_show_options() is for displaying mount options in /proc/mounts.
+ * Not all settable options are displayed but most of the important
+ * ones are.
+ */
+static int
+cifs_show_options(struct seq_file *s, struct vfsmount *m)
+{
+ struct cifs_sb_info *cifs_sb;
+
+ cifs_sb = CIFS_SB(m->mnt_sb);
+
+ if (cifs_sb) {
+ if (cifs_sb->tcon) {
+ seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
+ if (cifs_sb->tcon->ses) {
+ if (cifs_sb->tcon->ses->userName)
+ seq_printf(s, ",username=%s",
+ cifs_sb->tcon->ses->userName);
+ if(cifs_sb->tcon->ses->domainName)
+ seq_printf(s, ",domain=%s",
+ cifs_sb->tcon->ses->domainName);
+ }
+ }
+ seq_printf(s, ",rsize=%d",cifs_sb->rsize);
+ seq_printf(s, ",wsize=%d",cifs_sb->wsize);
+ }
+ return 0;
+}
+
+#ifdef CONFIG_CIFS_QUOTA
+int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
+ struct fs_disk_quota * pdquota)
+{
+ int xid;
+ int rc = 0;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifsTconInfo *pTcon;
+
+ if(cifs_sb)
+ pTcon = cifs_sb->tcon;
+ else
+ return -EIO;
+
+
+ xid = GetXid();
+ if(pTcon) {
+ cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
+ } else {
+ return -EIO;
+ }
+
+ FreeXid(xid);
+ return rc;
+}
+
+int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
+ struct fs_disk_quota * pdquota)
+{
+ int xid;
+ int rc = 0;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifsTconInfo *pTcon;
+
+ if(cifs_sb)
+ pTcon = cifs_sb->tcon;
+ else
+ return -EIO;
+
+ xid = GetXid();
+ if(pTcon) {
+ cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
+ } else {
+ rc = -EIO;
+ }
+
+ FreeXid(xid);
+ return rc;
+}
+
+int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
+{
+ int xid;
+ int rc = 0;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifsTconInfo *pTcon;
+
+ if(cifs_sb)
+ pTcon = cifs_sb->tcon;
+ else
+ return -EIO;
+
+ xid = GetXid();
+ if(pTcon) {
+ cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
+ } else {
+ rc = -EIO;
+ }
+
+ FreeXid(xid);
+ return rc;
+}
+
+int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
+{
+ int xid;
+ int rc = 0;
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ struct cifsTconInfo *pTcon;
+
+ if(cifs_sb) {
+ pTcon = cifs_sb->tcon;
+ } else {
+ return -EIO;
+ }
+ xid = GetXid();
+ if(pTcon) {
+ cFYI(1,("pqstats %p",qstats));
+ } else {
+ rc = -EIO;
+ }
+
+ FreeXid(xid);
+ return rc;
+}
+
+static struct quotactl_ops cifs_quotactl_ops = {
+ .set_xquota = cifs_xquota_set,
+ .get_xquota = cifs_xquota_set,
+ .set_xstate = cifs_xstate_set,
+ .get_xstate = cifs_xstate_get,
+};
+#endif
+
+static int cifs_remount(struct super_block *sb, int *flags, char *data)
+{
+ *flags |= MS_NODIRATIME;
+ return 0;
+}
+
+struct super_operations cifs_super_ops = {
+ .read_inode = cifs_read_inode,
+ .put_super = cifs_put_super,
+ .statfs = cifs_statfs,
+ .alloc_inode = cifs_alloc_inode,
+ .destroy_inode = cifs_destroy_inode,
+/* .drop_inode = generic_delete_inode,
+ .delete_inode = cifs_delete_inode, *//* Do not need the above two functions
+ 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, *//* consider adding in the future */
+ .remount_fs = cifs_remount,
+};
+
+static struct super_block *
+cifs_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ int rc;
+ struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
+
+ cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
+
+ if (IS_ERR(sb))
+ return sb;
+
+ sb->s_flags = flags;
+
+ rc = cifs_read_super(sb, data, dev_name, flags & MS_VERBOSE ? 1 : 0);
+ if (rc) {
+ up_write(&sb->s_umount);
+ deactivate_super(sb);
+ return ERR_PTR(rc);
+ }
+ sb->s_flags |= MS_ACTIVE;
+ return sb;
+}
+
+static ssize_t
+cifs_read_wrapper(struct file * file, char __user *read_data, size_t read_size,
+ loff_t * poffset)
+{
+ if(file->f_dentry == NULL)
+ return -EIO;
+ else if(file->f_dentry->d_inode == NULL)
+ return -EIO;
+
+ cFYI(1,("In read_wrapper size %zd at %lld",read_size,*poffset));
+
+ if(CIFS_I(file->f_dentry->d_inode)->clientCanCacheRead) {
+ return generic_file_read(file,read_data,read_size,poffset);
+ } else {
+ /* BB do we need to lock inode from here until after invalidate? */
+/* if(file->f_dentry->d_inode->i_mapping) {
+ filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
+ filemap_fdatawait(file->f_dentry->d_inode->i_mapping);
+ }*/
+/* cifs_revalidate(file->f_dentry);*/ /* BB fixme */
+
+ /* BB we should make timer configurable - perhaps
+ by simply calling cifs_revalidate here */
+ /* invalidate_remote_inode(file->f_dentry->d_inode);*/
+ return generic_file_read(file,read_data,read_size,poffset);
+ }
+}
+
+static ssize_t
+cifs_write_wrapper(struct file * file, const char __user *write_data,
+ size_t write_size, loff_t * poffset)
+{
+ ssize_t written;
+
+ if(file->f_dentry == NULL)
+ return -EIO;
+ else if(file->f_dentry->d_inode == NULL)
+ return -EIO;
+
+ cFYI(1,("In write_wrapper size %zd at %lld",write_size,*poffset));
+
+ written = generic_file_write(file,write_data,write_size,poffset);
+ if(!CIFS_I(file->f_dentry->d_inode)->clientCanCacheAll) {
+ if(file->f_dentry->d_inode->i_mapping) {
+ filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
+ }
+ }
+ return written;
+}
+
+
+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
+};
+
+struct file_operations cifs_file_ops = {
+ .read = cifs_read_wrapper,
+ .write = cifs_write_wrapper,
+ .open = cifs_open,
+ .release = cifs_close,
+ .lock = cifs_lock,
+ .fsync = cifs_fsync,
+ .flush = cifs_flush,
+ .mmap = cifs_file_mmap,
+ .sendfile = generic_file_sendfile,
+#ifdef CONFIG_CIFS_EXPERIMENTAL
+ .readv = generic_file_readv,
+ .writev = generic_file_writev,
+ .aio_read = generic_file_aio_read,
+ .aio_write = generic_file_aio_write,
+ .dir_notify = cifs_dir_notify,
+#endif /* CONFIG_CIFS_EXPERIMENTAL */
+};
+
+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_EXPERIMENTAL
+ .dir_notify = cifs_dir_notify,
+#endif /* CONFIG_CIFS_EXPERIMENTAL */
+};
+
+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 */
+};
+
+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,
+ 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(cifs_min_rcv,
+ mempool_alloc_slab,
+ mempool_free_slab,
+ cifs_req_cachep);
+
+ if(cifs_req_poolp == NULL) {
+ kmem_cache_destroy(cifs_req_cachep);
+ return -ENOMEM;
+ }
+ /* 256 (MAX_CIFS_HDR_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_HDR_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(cifs_min_small,
+ mempool_alloc_slab,
+ mempool_free_slab,
+ 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;
+
+ cifs_mid_poolp = mempool_create(3 /* a reasonable min simultan opers */,
+ mempool_alloc_slab,
+ mempool_free_slab,
+ 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;
+
+ daemonize("cifsoplockd");
+ allow_signal(SIGTERM);
+
+ oplockThread = current;
+ do {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ schedule_timeout(1*HZ);
+ 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_sem across
+ the call */
+ /* down(&inode->i_sem);*/
+ 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;
+ /* up(&inode->i_sem);*/
+ 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);
+ }
+ } while(!signal_pending(current));
+ complete_and_exit (&cifs_oplock_exited, 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);
+/*
+ * 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(&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) {
+ rc = cifs_init_mids();
+ if (!rc) {
+ rc = cifs_init_request_bufs();
+ if (!rc) {
+ rc = register_filesystem(&cifs_fs_type);
+ if (!rc) {
+ rc = (int)kernel_thread(cifs_oplock_thread, NULL,
+ CLONE_FS | CLONE_FILES | CLONE_VM);
+ if(rc > 0)
+ return 0;
+ else
+ cERROR(1,("error %d create oplock thread",rc));
+ }
+ cifs_destroy_request_bufs();
+ }
+ cifs_destroy_mids();
+ }
+ cifs_destroy_inodecache();
+ }
+#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();
+ if(oplockThread) {
+ send_sig(SIGTERM, oplockThread, 1);
+ wait_for_completion(&cifs_oplock_exited);
+ }
+}
+
+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)
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 13:20:43 +0000