/* * 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 #include #include #include #include #include #include #include #include #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 #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; int 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 total path, but note that some servers (includinng Samba 3) have a shorter maximum path */ 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 */ /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */ if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS & le64_to_cpu(pTcon->fsUnixInfo.Capability))) rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf); /* Only need to call the old QFSInfo if failed on newer one */ if(rc) #endif /* CIFS_EXPERIMENTAL */ rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* int f_type; __fsid_t f_fsid; int f_namelen; */ /* BB get from info in tcon struct at mount time 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_POSIX .ioctl = cifs_ioctl, #endif /* CONFIG_CIFS_POSIX */ #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_POSIX .ioctl = cifs_ioctl, #endif /* CONFIG_CIFS_POSIX */ #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 */ .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, 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); oplockThread = NULL; } 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 "); 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)