| /* |
| * fs/cifs/cifsfs.c |
| * |
| * Copyright (C) International Business Machines Corp., 2002,2008 |
| * 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 <linux/delay.h> |
| #include <linux/kthread.h> |
| #include <linux/freezer.h> |
| #include <linux/smp_lock.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> |
| #include <linux/key-type.h> |
| #include "dns_resolve.h" |
| #include "cifs_spnego.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 /* QUOTA */ |
| |
| 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 = CIFSSEC_DEF; |
| /* unsigned int ntlmv2_support = 0; */ |
| unsigned int sign_CIFS_PDUs = 1; |
| extern struct task_struct *oplockThread; /* remove sparse warning */ |
| struct task_struct *oplockThread = NULL; |
| /* extern struct task_struct * dnotifyThread; remove sparse warning */ |
| static const struct super_operations cifs_super_ops; |
| 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"); |
| |
| extern mempool_t *cifs_sm_req_poolp; |
| extern mempool_t *cifs_req_poolp; |
| extern mempool_t *cifs_mid_poolp; |
| |
| extern struct kmem_cache *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; |
| |
| /* BB should we make this contingent on mount parm? */ |
| sb->s_flags |= MS_NODIRATIME | MS_NOATIME; |
| sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL); |
| cifs_sb = CIFS_SB(sb); |
| if (cifs_sb == NULL) |
| return -ENOMEM; |
| |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| /* copy mount params to sb for use in submounts */ |
| /* BB: should we move this after the mount so we |
| * do not have to do the copy on failed mounts? |
| * BB: May be it is better to do simple copy before |
| * complex operation (mount), and in case of fail |
| * just exit instead of doing mount and attempting |
| * undo it if this copy fails?*/ |
| if (data) { |
| int len = strlen(data); |
| cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL); |
| if (cifs_sb->mountdata == NULL) { |
| kfree(sb->s_fs_info); |
| sb->s_fs_info = NULL; |
| return -ENOMEM; |
| } |
| strncpy(cifs_sb->mountdata, data, len + 1); |
| cifs_sb->mountdata[len] = '\0'; |
| } |
| #endif |
| |
| 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 = cifs_root_iget(sb, ROOT_I); |
| |
| if (IS_ERR(inode)) { |
| rc = PTR_ERR(inode); |
| inode = NULL; |
| goto out_no_root; |
| } |
| |
| sb->s_root = d_alloc_root(inode); |
| |
| if (!sb->s_root) { |
| rc = -ENOMEM; |
| goto out_no_root; |
| } |
| |
| #ifdef CONFIG_CIFS_EXPERIMENTAL |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
| cFYI(1, ("export ops supported")); |
| sb->s_export_op = &cifs_export_ops; |
| } |
| #endif /* EXPERIMENTAL */ |
| |
| return 0; |
| |
| out_no_root: |
| cERROR(1, ("cifs_read_super: get root inode failed")); |
| if (inode) |
| iput(inode); |
| |
| cifs_umount(sb, cifs_sb); |
| |
| out_mount_failed: |
| if (cifs_sb) { |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| if (cifs_sb->mountdata) { |
| kfree(cifs_sb->mountdata); |
| cifs_sb->mountdata = NULL; |
| } |
| #endif |
| 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; |
| } |
| |
| lock_kernel(); |
| |
| rc = cifs_umount(sb, cifs_sb); |
| if (rc) |
| cERROR(1, ("cifs_umount failed with return code %d", rc)); |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| if (cifs_sb->mountdata) { |
| kfree(cifs_sb->mountdata); |
| cifs_sb->mountdata = NULL; |
| } |
| #endif |
| |
| unload_nls(cifs_sb->local_nls); |
| kfree(cifs_sb); |
| |
| unlock_kernel(); |
| } |
| |
| static int |
| cifs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| { |
| struct super_block *sb = dentry->d_sb; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| struct cifsTconInfo *tcon = cifs_sb->tcon; |
| int rc = -EOPNOTSUPP; |
| int xid; |
| |
| xid = GetXid(); |
| |
| buf->f_type = CIFS_MAGIC_NUMBER; |
| |
| /* |
| * 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. |
| * |
| * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO. |
| */ |
| buf->f_namelen = PATH_MAX; |
| buf->f_files = 0; /* undefined */ |
| buf->f_ffree = 0; /* unlimited */ |
| |
| /* |
| * We could add a second check for a QFS Unix capability bit |
| */ |
| if ((tcon->ses->capabilities & CAP_UNIX) && |
| (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability))) |
| rc = CIFSSMBQFSPosixInfo(xid, tcon, buf); |
| |
| /* |
| * Only need to call the old QFSInfo if failed on newer one, |
| * e.g. by OS/2. |
| **/ |
| if (rc && (tcon->ses->capabilities & CAP_NT_SMBS)) |
| rc = CIFSSMBQFSInfo(xid, tcon, buf); |
| |
| /* |
| * Some old Windows servers also do not support level 103, retry with |
| * older level one if old server failed the previous call or we |
| * bypassed it because we detected that this was an older LANMAN sess |
| */ |
| if (rc) |
| rc = SMBOldQFSInfo(xid, tcon, buf); |
| |
| FreeXid(xid); |
| return 0; |
| } |
| |
| static int cifs_permission(struct inode *inode, int mask) |
| { |
| struct cifs_sb_info *cifs_sb; |
| |
| cifs_sb = CIFS_SB(inode->i_sb); |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) { |
| if ((mask & MAY_EXEC) && !execute_ok(inode)) |
| return -EACCES; |
| else |
| 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 struct kmem_cache *cifs_inode_cachep; |
| static struct kmem_cache *cifs_req_cachep; |
| static struct kmem_cache *cifs_mid_cachep; |
| struct kmem_cache *cifs_oplock_cachep; |
| static struct kmem_cache *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, GFP_KERNEL); |
| if (!cifs_inode) |
| return NULL; |
| cifs_inode->cifsAttrs = 0x20; /* default */ |
| atomic_set(&cifs_inode->inUse, 0); |
| cifs_inode->time = 0; |
| cifs_inode->write_behind_rc = 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->delete_pending = false; |
| cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */ |
| cifs_inode->server_eof = 0; |
| |
| /* Can not set i_flags here - they get immediately overwritten |
| to zero by the VFS */ |
| /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/ |
| 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; |
| struct cifsTconInfo *tcon; |
| struct TCP_Server_Info *server; |
| |
| cifs_sb = CIFS_SB(m->mnt_sb); |
| tcon = cifs_sb->tcon; |
| |
| seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName); |
| if (tcon->ses->userName) |
| seq_printf(s, ",username=%s", tcon->ses->userName); |
| if (tcon->ses->domainName) |
| seq_printf(s, ",domain=%s", tcon->ses->domainName); |
| |
| cifs_show_address(s, tcon->ses->server); |
| |
| seq_printf(s, ",uid=%d", cifs_sb->mnt_uid); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) |
| seq_printf(s, ",forceuid"); |
| |
| seq_printf(s, ",gid=%d", cifs_sb->mnt_gid); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) |
| seq_printf(s, ",forcegid"); |
| |
| server = tcon->ses->server; |
| seq_printf(s, ",addr="); |
| switch (server->addr.sockAddr6.sin6_family) { |
| case AF_INET6: |
| seq_printf(s, "%pI6", &server->addr.sockAddr6.sin6_addr); |
| break; |
| case AF_INET: |
| seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr); |
| break; |
| } |
| |
| if (!tcon->unix_ext) |
| seq_printf(s, ",file_mode=0%o,dir_mode=0%o", |
| cifs_sb->mnt_file_mode, |
| cifs_sb->mnt_dir_mode); |
| if (tcon->seal) |
| seq_printf(s, ",seal"); |
| if (tcon->nocase) |
| seq_printf(s, ",nocase"); |
| if (tcon->retry) |
| seq_printf(s, ",hard"); |
| if (cifs_sb->prepath) |
| seq_printf(s, ",prepath=%s", cifs_sb->prepath); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) |
| seq_printf(s, ",posixpaths"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) |
| seq_printf(s, ",setuids"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) |
| seq_printf(s, ",serverino"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) |
| seq_printf(s, ",directio"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| seq_printf(s, ",nouser_xattr"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) |
| seq_printf(s, ",mapchars"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) |
| seq_printf(s, ",sfu"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| seq_printf(s, ",nobrl"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) |
| seq_printf(s, ",cifsacl"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) |
| seq_printf(s, ",dynperm"); |
| if (m->mnt_sb->s_flags & MS_POSIXACL) |
| seq_printf(s, ",acl"); |
| |
| 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 |
| rc = -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_get, |
| .set_xstate = cifs_xstate_set, |
| .get_xstate = cifs_xstate_get, |
| }; |
| #endif |
| |
| static void cifs_umount_begin(struct super_block *sb) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| struct cifsTconInfo *tcon; |
| |
| if (cifs_sb == NULL) |
| return; |
| |
| tcon = cifs_sb->tcon; |
| if (tcon == NULL) |
| return; |
| |
| lock_kernel(); |
| read_lock(&cifs_tcp_ses_lock); |
| if (tcon->tc_count == 1) |
| tcon->tidStatus = CifsExiting; |
| read_unlock(&cifs_tcp_ses_lock); |
| |
| /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */ |
| /* cancel_notify_requests(tcon); */ |
| if (tcon->ses && tcon->ses->server) { |
| cFYI(1, ("wake up tasks now - umount begin not complete")); |
| wake_up_all(&tcon->ses->server->request_q); |
| wake_up_all(&tcon->ses->server->response_q); |
| msleep(1); /* yield */ |
| /* we have to kick the requests once more */ |
| wake_up_all(&tcon->ses->server->response_q); |
| msleep(1); |
| } |
| /* BB FIXME - finish add checks for tidStatus BB */ |
| |
| unlock_kernel(); |
| return; |
| } |
| |
| #ifdef CONFIG_CIFS_STATS2 |
| static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt) |
| { |
| /* BB FIXME */ |
| return 0; |
| } |
| #endif |
| |
| static int cifs_remount(struct super_block *sb, int *flags, char *data) |
| { |
| *flags |= MS_NODIRATIME; |
| return 0; |
| } |
| |
| static const struct super_operations cifs_super_ops = { |
| .put_super = cifs_put_super, |
| .statfs = cifs_statfs, |
| .alloc_inode = cifs_alloc_inode, |
| .destroy_inode = cifs_destroy_inode, |
| /* .drop_inode = generic_delete_inode, |
| .delete_inode = cifs_delete_inode, */ /* Do not need 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, |
| .remount_fs = cifs_remount, |
| #ifdef CONFIG_CIFS_STATS2 |
| .show_stats = cifs_show_stats, |
| #endif |
| }; |
| |
| static int |
| cifs_get_sb(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
| { |
| 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 PTR_ERR(sb); |
| |
| sb->s_flags = flags; |
| |
| rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0); |
| if (rc) { |
| deactivate_locked_super(sb); |
| return rc; |
| } |
| sb->s_flags |= MS_ACTIVE; |
| simple_set_mnt(mnt, sb); |
| return 0; |
| } |
| |
| static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| unsigned long nr_segs, loff_t pos) |
| { |
| struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
| ssize_t written; |
| |
| written = generic_file_aio_write(iocb, iov, nr_segs, 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 == SEEK_END) { |
| int retval; |
| |
| /* some applications poll for the file length in this strange |
| way so we must seek to end on non-oplocked files by |
| setting the revalidate time to zero */ |
| CIFS_I(file->f_path.dentry->d_inode)->time = 0; |
| |
| retval = cifs_revalidate(file->f_path.dentry); |
| if (retval < 0) |
| return (loff_t)retval; |
| } |
| return generic_file_llseek_unlocked(file, offset, origin); |
| } |
| |
| #ifdef CONFIG_CIFS_EXPERIMENTAL |
| static int cifs_setlease(struct file *file, long arg, struct file_lock **lease) |
| { |
| /* note that this is called by vfs setlease with the BKL held |
| although I doubt that BKL is needed here in cifs */ |
| struct inode *inode = file->f_path.dentry->d_inode; |
| |
| if (!(S_ISREG(inode->i_mode))) |
| return -EINVAL; |
| |
| /* check if file is oplocked */ |
| if (((arg == F_RDLCK) && |
| (CIFS_I(inode)->clientCanCacheRead)) || |
| ((arg == F_WRLCK) && |
| (CIFS_I(inode)->clientCanCacheAll))) |
| return generic_setlease(file, arg, lease); |
| else if (CIFS_SB(inode->i_sb)->tcon->local_lease && |
| !CIFS_I(inode)->clientCanCacheRead) |
| /* If the server claims to support oplock on this |
| file, then we still need to check oplock even |
| if the local_lease mount option is set, but there |
| are servers which do not support oplock for which |
| this mount option may be useful if the user |
| knows that the file won't be changed on the server |
| by anyone else */ |
| return generic_setlease(file, arg, lease); |
| else |
| return -EAGAIN; |
| } |
| #endif |
| |
| struct file_system_type cifs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "cifs", |
| .get_sb = cifs_get_sb, |
| .kill_sb = kill_anon_super, |
| /* .fs_flags */ |
| }; |
| const struct inode_operations cifs_dir_inode_ops = { |
| .create = cifs_create, |
| .lookup = cifs_lookup, |
| .getattr = cifs_getattr, |
| .unlink = cifs_unlink, |
| .link = cifs_hardlink, |
| .mkdir = cifs_mkdir, |
| .rmdir = cifs_rmdir, |
| .rename = cifs_rename, |
| .permission = cifs_permission, |
| /* revalidate:cifs_revalidate, */ |
| .setattr = cifs_setattr, |
| .symlink = cifs_symlink, |
| .mknod = cifs_mknod, |
| #ifdef CONFIG_CIFS_XATTR |
| .setxattr = cifs_setxattr, |
| .getxattr = cifs_getxattr, |
| .listxattr = cifs_listxattr, |
| .removexattr = cifs_removexattr, |
| #endif |
| }; |
| |
| const struct inode_operations cifs_file_inode_ops = { |
| /* revalidate:cifs_revalidate, */ |
| .setattr = cifs_setattr, |
| .getattr = cifs_getattr, /* do we need this anymore? */ |
| .rename = cifs_rename, |
| .permission = cifs_permission, |
| #ifdef CONFIG_CIFS_XATTR |
| .setxattr = cifs_setxattr, |
| .getxattr = cifs_getxattr, |
| .listxattr = cifs_listxattr, |
| .removexattr = cifs_removexattr, |
| #endif |
| }; |
| |
| const struct inode_operations cifs_symlink_inode_ops = { |
| .readlink = generic_readlink, |
| .follow_link = cifs_follow_link, |
| .put_link = cifs_put_link, |
| .permission = cifs_permission, |
| /* BB add the following two eventually */ |
| /* revalidate: cifs_revalidate, |
| setattr: cifs_notify_change, *//* BB do we need notify change */ |
| #ifdef CONFIG_CIFS_XATTR |
| .setxattr = cifs_setxattr, |
| .getxattr = cifs_getxattr, |
| .listxattr = cifs_listxattr, |
| .removexattr = cifs_removexattr, |
| #endif |
| }; |
| |
| const struct file_operations cifs_file_ops = { |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .aio_read = generic_file_aio_read, |
| .aio_write = cifs_file_aio_write, |
| .open = cifs_open, |
| .release = cifs_close, |
| .lock = cifs_lock, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| .llseek = cifs_llseek, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| |
| #ifdef CONFIG_CIFS_EXPERIMENTAL |
| .setlease = cifs_setlease, |
| #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, |
| .splice_read = generic_file_splice_read, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| .llseek = cifs_llseek, |
| #ifdef CONFIG_CIFS_EXPERIMENTAL |
| .setlease = cifs_setlease, |
| #endif /* CONFIG_CIFS_EXPERIMENTAL */ |
| }; |
| const struct file_operations cifs_file_nobrl_ops = { |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .aio_read = generic_file_aio_read, |
| .aio_write = cifs_file_aio_write, |
| .open = cifs_open, |
| .release = cifs_close, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| .llseek = cifs_llseek, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| |
| #ifdef CONFIG_CIFS_EXPERIMENTAL |
| .setlease = cifs_setlease, |
| #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, |
| .splice_read = generic_file_splice_read, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| .llseek = cifs_llseek, |
| #ifdef CONFIG_CIFS_EXPERIMENTAL |
| .setlease = cifs_setlease, |
| #endif /* CONFIG_CIFS_EXPERIMENTAL */ |
| }; |
| |
| const struct file_operations cifs_dir_ops = { |
| .readdir = cifs_readdir, |
| .release = cifs_closedir, |
| .read = generic_read_dir, |
| .unlocked_ioctl = cifs_ioctl, |
| .llseek = generic_file_llseek, |
| }; |
| |
| static void |
| cifs_init_once(void *inode) |
| { |
| struct cifsInodeInfo *cifsi = inode; |
| |
| inode_init_once(&cifsi->vfs_inode); |
| INIT_LIST_HEAD(&cifsi->lockList); |
| } |
| |
| static int |
| cifs_init_inodecache(void) |
| { |
| cifs_inode_cachep = kmem_cache_create("cifs_inode_cache", |
| sizeof(struct cifsInodeInfo), |
| 0, (SLAB_RECLAIM_ACCOUNT| |
| SLAB_MEM_SPREAD), |
| cifs_init_once); |
| if (cifs_inode_cachep == NULL) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void |
| cifs_destroy_inodecache(void) |
| { |
| kmem_cache_destroy(cifs_inode_cachep); |
| } |
| |
| static int |
| cifs_init_request_bufs(void) |
| { |
| if (CIFSMaxBufSize < 8192) { |
| /* Buffer size can not be smaller than 2 * PATH_MAX since maximum |
| Unicode path name has to fit in any SMB/CIFS path based frames */ |
| CIFSMaxBufSize = 8192; |
| } else if (CIFSMaxBufSize > 1024*127) { |
| CIFSMaxBufSize = 1024 * 127; |
| } else { |
| CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/ |
| } |
| /* cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */ |
| cifs_req_cachep = kmem_cache_create("cifs_request", |
| CIFSMaxBufSize + |
| MAX_CIFS_HDR_SIZE, 0, |
| SLAB_HWCACHE_ALIGN, NULL); |
| if (cifs_req_cachep == NULL) |
| return -ENOMEM; |
| |
| if (cifs_min_rcv < 1) |
| cifs_min_rcv = 1; |
| else if (cifs_min_rcv > 64) { |
| cifs_min_rcv = 64; |
| cERROR(1, ("cifs_min_rcv set to maximum (64)")); |
| } |
| |
| cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv, |
| cifs_req_cachep); |
| |
| if (cifs_req_poolp == NULL) { |
| kmem_cache_destroy(cifs_req_cachep); |
| return -ENOMEM; |
| } |
| /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and |
| almost all handle based requests (but not write response, nor is it |
| sufficient for path based requests). A smaller size would have |
| been more efficient (compacting multiple slab items on one 4k page) |
| for the case in which debug was on, but this larger size allows |
| more SMBs to use small buffer alloc and is still much more |
| efficient to alloc 1 per page off the slab compared to 17K (5page) |
| alloc of large cifs buffers even when page debugging is on */ |
| cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq", |
| MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN, |
| NULL); |
| if (cifs_sm_req_cachep == NULL) { |
| mempool_destroy(cifs_req_poolp); |
| kmem_cache_destroy(cifs_req_cachep); |
| return -ENOMEM; |
| } |
| |
| if (cifs_min_small < 2) |
| cifs_min_small = 2; |
| else if (cifs_min_small > 256) { |
| cifs_min_small = 256; |
| cFYI(1, ("cifs_min_small set to maximum (256)")); |
| } |
| |
| cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small, |
| cifs_sm_req_cachep); |
| |
| if (cifs_sm_req_poolp == NULL) { |
| mempool_destroy(cifs_req_poolp); |
| kmem_cache_destroy(cifs_req_cachep); |
| kmem_cache_destroy(cifs_sm_req_cachep); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static void |
| cifs_destroy_request_bufs(void) |
| { |
| mempool_destroy(cifs_req_poolp); |
| kmem_cache_destroy(cifs_req_cachep); |
| mempool_destroy(cifs_sm_req_poolp); |
| kmem_cache_destroy(cifs_sm_req_cachep); |
| } |
| |
| static int |
| cifs_init_mids(void) |
| { |
| cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids", |
| sizeof(struct mid_q_entry), 0, |
| SLAB_HWCACHE_ALIGN, NULL); |
| if (cifs_mid_cachep == NULL) |
| return -ENOMEM; |
| |
| /* 3 is a reasonable minimum number of simultaneous operations */ |
| cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep); |
| if (cifs_mid_poolp == NULL) { |
| kmem_cache_destroy(cifs_mid_cachep); |
| return -ENOMEM; |
| } |
| |
| cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs", |
| sizeof(struct oplock_q_entry), 0, |
| SLAB_HWCACHE_ALIGN, NULL); |
| if (cifs_oplock_cachep == NULL) { |
| mempool_destroy(cifs_mid_poolp); |
| kmem_cache_destroy(cifs_mid_cachep); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static void |
| cifs_destroy_mids(void) |
| { |
| mempool_destroy(cifs_mid_poolp); |
| kmem_cache_destroy(cifs_mid_cachep); |
| kmem_cache_destroy(cifs_oplock_cachep); |
| } |
| |
| static int cifs_oplock_thread(void *dummyarg) |
| { |
| struct oplock_q_entry *oplock_item; |
| struct cifsTconInfo *pTcon; |
| struct inode *inode; |
| __u16 netfid; |
| int rc, waitrc = 0; |
| |
| set_freezable(); |
| 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); |
| 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)) { |
| #ifdef CONFIG_CIFS_EXPERIMENTAL |
| if (CIFS_I(inode)->clientCanCacheAll == 0) |
| break_lease(inode, FMODE_READ); |
| else if (CIFS_I(inode)->clientCanCacheRead == 0) |
| break_lease(inode, FMODE_WRITE); |
| #endif |
| rc = filemap_fdatawrite(inode->i_mapping); |
| if (CIFS_I(inode)->clientCanCacheRead == 0) { |
| waitrc = filemap_fdatawait( |
| inode->i_mapping); |
| invalidate_remote_inode(inode); |
| } |
| if (rc == 0) |
| rc = waitrc; |
| } 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 stale oplock after recent reconnect |
| 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->need_reconnect) { |
| rc = CIFSSMBLock(0, pTcon, netfid, |
| 0 /* len */ , 0 /* offset */, 0, |
| 0, LOCKING_ANDX_OPLOCK_RELEASE, |
| false /* wait flag */); |
| cFYI(1, ("Oplock release rc = %d", rc)); |
| } |
| set_current_state(TASK_INTERRUPTIBLE); |
| schedule_timeout(1); /* yield in case q were corrupt */ |
| } |
| } while (!kthread_should_stop()); |
| |
| return 0; |
| } |
| |
| static int __init |
| init_cifs(void) |
| { |
| int rc = 0; |
| cifs_proc_init(); |
| INIT_LIST_HEAD(&cifs_tcp_ses_list); |
| 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; |
| memset(Local_System_Name, 0, 15); |
| rwlock_init(&GlobalSMBSeslock); |
| rwlock_init(&cifs_tcp_ses_lock); |
| spin_lock_init(&GlobalMid_Lock); |
| |
| if (cifs_max_pending < 2) { |
| cifs_max_pending = 2; |
| cFYI(1, ("cifs_max_pending set to min of 2")); |
| } else if (cifs_max_pending > 256) { |
| cifs_max_pending = 256; |
| cFYI(1, ("cifs_max_pending set to max of 256")); |
| } |
| |
| rc = cifs_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; |
| #ifdef CONFIG_CIFS_UPCALL |
| rc = register_key_type(&cifs_spnego_key_type); |
| if (rc) |
| goto out_unregister_filesystem; |
| #endif |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| rc = register_key_type(&key_type_dns_resolver); |
| if (rc) |
| goto out_unregister_key_type; |
| #endif |
| 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_dfs_key_type; |
| } |
| |
| return 0; |
| |
| out_unregister_dfs_key_type: |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| unregister_key_type(&key_type_dns_resolver); |
| out_unregister_key_type: |
| #endif |
| #ifdef CONFIG_CIFS_UPCALL |
| unregister_key_type(&cifs_spnego_key_type); |
| out_unregister_filesystem: |
| #endif |
| 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: |
| cifs_proc_clean(); |
| return rc; |
| } |
| |
| static void __exit |
| exit_cifs(void) |
| { |
| cFYI(DBG2, ("exit_cifs")); |
| cifs_proc_clean(); |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| cifs_dfs_release_automount_timer(); |
| unregister_key_type(&key_type_dns_resolver); |
| #endif |
| #ifdef CONFIG_CIFS_UPCALL |
| unregister_key_type(&cifs_spnego_key_type); |
| #endif |
| unregister_filesystem(&cifs_fs_type); |
| cifs_destroy_inodecache(); |
| cifs_destroy_mids(); |
| cifs_destroy_request_bufs(); |
| kthread_stop(oplockThread); |
| } |
| |
| 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) |