| /* |
| * 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 <net/ipv6.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 "cifs_spnego.h" |
| #include "fscache.h" |
| #define CIFS_MAGIC_NUMBER 0xFF534D42 /* the first four bytes of SMB PDUs */ |
| |
| int cifsFYI = 0; |
| int cifsERROR = 1; |
| int traceSMB = 0; |
| unsigned int oplockEnabled = 1; |
| unsigned int linuxExtEnabled = 1; |
| unsigned int lookupCacheEnabled = 1; |
| unsigned int multiuser_mount = 0; |
| unsigned int global_secflags = CIFSSEC_DEF; |
| /* unsigned int ntlmv2_support = 0; */ |
| unsigned int sign_CIFS_PDUs = 1; |
| 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"); |
| unsigned short echo_retries = 5; |
| module_param(echo_retries, ushort, 0644); |
| MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and " |
| "reconnecting server. Default: 5. 0 means " |
| "never reconnect."); |
| extern mempool_t *cifs_sm_req_poolp; |
| extern mempool_t *cifs_req_poolp; |
| extern mempool_t *cifs_mid_poolp; |
| |
| void |
| cifs_sb_active(struct super_block *sb) |
| { |
| struct cifs_sb_info *server = CIFS_SB(sb); |
| |
| if (atomic_inc_return(&server->active) == 1) |
| atomic_inc(&sb->s_active); |
| } |
| |
| void |
| cifs_sb_deactive(struct super_block *sb) |
| { |
| struct cifs_sb_info *server = CIFS_SB(sb); |
| |
| if (atomic_dec_and_test(&server->active)) |
| deactivate_super(sb); |
| } |
| |
| static int |
| cifs_read_super(struct super_block *sb, struct smb_vol *volume_info, |
| const char *devname, int silent) |
| { |
| struct inode *inode; |
| struct cifs_sb_info *cifs_sb; |
| int rc = 0; |
| |
| cifs_sb = CIFS_SB(sb); |
| |
| spin_lock_init(&cifs_sb->tlink_tree_lock); |
| cifs_sb->tlink_tree = RB_ROOT; |
| |
| rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY); |
| if (rc) |
| return rc; |
| |
| cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages; |
| |
| rc = cifs_mount(sb, cifs_sb, volume_info, 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; |
| sb->s_bdi = &cifs_sb->bdi; |
| sb->s_blocksize = CIFS_MAX_MSGSIZE; |
| sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */ |
| inode = cifs_root_iget(sb); |
| |
| 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; |
| } |
| |
| /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */ |
| if (cifs_sb_master_tcon(cifs_sb)->nocase) |
| sb->s_d_op = &cifs_ci_dentry_ops; |
| else |
| sb->s_d_op = &cifs_dentry_ops; |
| |
| #ifdef CIFS_NFSD_EXPORT |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
| cFYI(1, "export ops supported"); |
| sb->s_export_op = &cifs_export_ops; |
| } |
| #endif /* CIFS_NFSD_EXPORT */ |
| |
| 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: |
| bdi_destroy(&cifs_sb->bdi); |
| 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); |
| if (cifs_sb->mountdata) { |
| kfree(cifs_sb->mountdata); |
| cifs_sb->mountdata = NULL; |
| } |
| |
| unload_nls(cifs_sb->local_nls); |
| bdi_destroy(&cifs_sb->bdi); |
| kfree(cifs_sb); |
| } |
| |
| 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 cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| 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, unsigned int flags) |
| { |
| struct cifs_sb_info *cifs_sb; |
| |
| if (flags & IPERM_FLAG_RCU) |
| return -ECHILD; |
| |
| 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, flags, NULL); |
| } |
| |
| static struct kmem_cache *cifs_inode_cachep; |
| static struct kmem_cache *cifs_req_cachep; |
| static struct kmem_cache *cifs_mid_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 */ |
| 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_set_oplock_level(cifs_inode, 0); |
| cifs_inode->delete_pending = false; |
| cifs_inode->invalid_mapping = false; |
| cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */ |
| cifs_inode->server_eof = 0; |
| cifs_inode->uniqueid = 0; |
| cifs_inode->createtime = 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_i_callback(struct rcu_head *head) |
| { |
| struct inode *inode = container_of(head, struct inode, i_rcu); |
| INIT_LIST_HEAD(&inode->i_dentry); |
| kmem_cache_free(cifs_inode_cachep, CIFS_I(inode)); |
| } |
| |
| static void |
| cifs_destroy_inode(struct inode *inode) |
| { |
| call_rcu(&inode->i_rcu, cifs_i_callback); |
| } |
| |
| static void |
| cifs_evict_inode(struct inode *inode) |
| { |
| truncate_inode_pages(&inode->i_data, 0); |
| end_writeback(inode); |
| cifs_fscache_release_inode_cookie(inode); |
| } |
| |
| static void |
| cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server) |
| { |
| struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr; |
| struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr; |
| |
| seq_printf(s, ",addr="); |
| |
| switch (server->dstaddr.ss_family) { |
| case AF_INET: |
| seq_printf(s, "%pI4", &sa->sin_addr.s_addr); |
| break; |
| case AF_INET6: |
| seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr); |
| if (sa6->sin6_scope_id) |
| seq_printf(s, "%%%u", sa6->sin6_scope_id); |
| break; |
| default: |
| seq_printf(s, "(unknown)"); |
| } |
| } |
| |
| static void |
| cifs_show_security(struct seq_file *s, struct TCP_Server_Info *server) |
| { |
| seq_printf(s, ",sec="); |
| |
| switch (server->secType) { |
| case LANMAN: |
| seq_printf(s, "lanman"); |
| break; |
| case NTLMv2: |
| seq_printf(s, "ntlmv2"); |
| break; |
| case NTLM: |
| seq_printf(s, "ntlm"); |
| break; |
| case Kerberos: |
| seq_printf(s, "krb5"); |
| break; |
| case RawNTLMSSP: |
| seq_printf(s, "ntlmssp"); |
| break; |
| default: |
| /* shouldn't ever happen */ |
| seq_printf(s, "unknown"); |
| break; |
| } |
| |
| if (server->sec_mode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
| seq_printf(s, "i"); |
| } |
| |
| /* |
| * 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(m->mnt_sb); |
| struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| struct sockaddr *srcaddr; |
| srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr; |
| |
| cifs_show_security(s, tcon->ses->server); |
| |
| seq_printf(s, ",unc=%s", tcon->treeName); |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER) |
| seq_printf(s, ",multiuser"); |
| else if (tcon->ses->user_name) |
| seq_printf(s, ",username=%s", tcon->ses->user_name); |
| |
| if (tcon->ses->domainName) |
| seq_printf(s, ",domain=%s", tcon->ses->domainName); |
| |
| if (srcaddr->sa_family != AF_UNSPEC) { |
| struct sockaddr_in *saddr4; |
| struct sockaddr_in6 *saddr6; |
| saddr4 = (struct sockaddr_in *)srcaddr; |
| saddr6 = (struct sockaddr_in6 *)srcaddr; |
| if (srcaddr->sa_family == AF_INET6) |
| seq_printf(s, ",srcaddr=%pI6c", |
| &saddr6->sin6_addr); |
| else if (srcaddr->sa_family == AF_INET) |
| seq_printf(s, ",srcaddr=%pI4", |
| &saddr4->sin_addr.s_addr); |
| else |
| seq_printf(s, ",srcaddr=BAD-AF:%i", |
| (int)(srcaddr->sa_family)); |
| } |
| |
| seq_printf(s, ",uid=%d", cifs_sb->mnt_uid); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) |
| seq_printf(s, ",forceuid"); |
| else |
| seq_printf(s, ",noforceuid"); |
| |
| seq_printf(s, ",gid=%d", cifs_sb->mnt_gid); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) |
| seq_printf(s, ",forcegid"); |
| else |
| seq_printf(s, ",noforcegid"); |
| |
| cifs_show_address(s, tcon->ses->server); |
| |
| 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 (tcon->unix_ext) |
| seq_printf(s, ",unix"); |
| else |
| seq_printf(s, ",nounix"); |
| 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_RWPIDFORWARD) |
| seq_printf(s, ",rwpidforward"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) |
| seq_printf(s, ",forcemand"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) |
| seq_printf(s, ",directio"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| seq_printf(s, ",nouser_xattr"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) |
| seq_printf(s, ",mapchars"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) |
| seq_printf(s, ",sfu"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| seq_printf(s, ",nobrl"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) |
| seq_printf(s, ",cifsacl"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) |
| seq_printf(s, ",dynperm"); |
| if (m->mnt_sb->s_flags & MS_POSIXACL) |
| seq_printf(s, ",acl"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) |
| seq_printf(s, ",mfsymlinks"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) |
| seq_printf(s, ",fsc"); |
| |
| seq_printf(s, ",rsize=%d", cifs_sb->rsize); |
| seq_printf(s, ",wsize=%d", cifs_sb->wsize); |
| /* convert actimeo and display it in seconds */ |
| seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ); |
| |
| return 0; |
| } |
| |
| static void cifs_umount_begin(struct super_block *sb) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| struct cifs_tcon *tcon; |
| |
| if (cifs_sb == NULL) |
| return; |
| |
| tcon = cifs_sb_master_tcon(cifs_sb); |
| |
| spin_lock(&cifs_tcp_ses_lock); |
| if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) { |
| /* we have other mounts to same share or we have |
| already tried to force umount this and woken up |
| all waiting network requests, nothing to do */ |
| spin_unlock(&cifs_tcp_ses_lock); |
| return; |
| } else if (tcon->tc_count == 1) |
| tcon->tidStatus = CifsExiting; |
| spin_unlock(&cifs_tcp_ses_lock); |
| |
| /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */ |
| /* cancel_notify_requests(tcon); */ |
| if (tcon->ses && tcon->ses->server) { |
| cFYI(1, "wake up tasks now - umount begin not complete"); |
| wake_up_all(&tcon->ses->server->request_q); |
| wake_up_all(&tcon->ses->server->response_q); |
| msleep(1); /* yield */ |
| /* we have to kick the requests once more */ |
| wake_up_all(&tcon->ses->server->response_q); |
| msleep(1); |
| } |
| |
| return; |
| } |
| |
| #ifdef CONFIG_CIFS_STATS2 |
| static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt) |
| { |
| /* BB FIXME */ |
| return 0; |
| } |
| #endif |
| |
| static int cifs_remount(struct super_block *sb, int *flags, char *data) |
| { |
| *flags |= MS_NODIRATIME; |
| return 0; |
| } |
| |
| static int cifs_drop_inode(struct inode *inode) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| |
| /* no serverino => unconditional eviction */ |
| return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) || |
| generic_drop_inode(inode); |
| } |
| |
| static const struct super_operations cifs_super_ops = { |
| .put_super = cifs_put_super, |
| .statfs = cifs_statfs, |
| .alloc_inode = cifs_alloc_inode, |
| .destroy_inode = cifs_destroy_inode, |
| .drop_inode = cifs_drop_inode, |
| .evict_inode = cifs_evict_inode, |
| /* .delete_inode = cifs_delete_inode, */ /* Do not need above |
| function unless later we add lazy close of inodes or unless the |
| kernel forgets to call us with the same number of releases (closes) |
| as opens */ |
| .show_options = cifs_show_options, |
| .umount_begin = cifs_umount_begin, |
| .remount_fs = cifs_remount, |
| #ifdef CONFIG_CIFS_STATS2 |
| .show_stats = cifs_show_stats, |
| #endif |
| }; |
| |
| /* |
| * Get root dentry from superblock according to prefix path mount option. |
| * Return dentry with refcount + 1 on success and NULL otherwise. |
| */ |
| static struct dentry * |
| cifs_get_root(struct smb_vol *vol, struct super_block *sb) |
| { |
| int xid, rc; |
| struct inode *inode; |
| struct qstr name; |
| struct dentry *dparent = NULL, *dchild = NULL, *alias; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| unsigned int i, full_len, len; |
| char *full_path = NULL, *pstart; |
| char sep; |
| |
| full_path = cifs_build_path_to_root(vol, cifs_sb, |
| cifs_sb_master_tcon(cifs_sb)); |
| if (full_path == NULL) |
| return NULL; |
| |
| cFYI(1, "Get root dentry for %s", full_path); |
| |
| xid = GetXid(); |
| sep = CIFS_DIR_SEP(cifs_sb); |
| dparent = dget(sb->s_root); |
| full_len = strlen(full_path); |
| full_path[full_len] = sep; |
| pstart = full_path + 1; |
| |
| for (i = 1, len = 0; i <= full_len; i++) { |
| if (full_path[i] != sep || !len) { |
| len++; |
| continue; |
| } |
| |
| full_path[i] = 0; |
| cFYI(1, "get dentry for %s", pstart); |
| |
| name.name = pstart; |
| name.len = len; |
| name.hash = full_name_hash(pstart, len); |
| dchild = d_lookup(dparent, &name); |
| if (dchild == NULL) { |
| cFYI(1, "not exists"); |
| dchild = d_alloc(dparent, &name); |
| if (dchild == NULL) { |
| dput(dparent); |
| dparent = NULL; |
| goto out; |
| } |
| } |
| |
| cFYI(1, "get inode"); |
| if (dchild->d_inode == NULL) { |
| cFYI(1, "not exists"); |
| inode = NULL; |
| if (cifs_sb_master_tcon(CIFS_SB(sb))->unix_ext) |
| rc = cifs_get_inode_info_unix(&inode, full_path, |
| sb, xid); |
| else |
| rc = cifs_get_inode_info(&inode, full_path, |
| NULL, sb, xid, NULL); |
| if (rc) { |
| dput(dchild); |
| dput(dparent); |
| dparent = NULL; |
| goto out; |
| } |
| alias = d_materialise_unique(dchild, inode); |
| if (alias != NULL) { |
| dput(dchild); |
| if (IS_ERR(alias)) { |
| dput(dparent); |
| dparent = NULL; |
| goto out; |
| } |
| dchild = alias; |
| } |
| } |
| cFYI(1, "parent %p, child %p", dparent, dchild); |
| |
| dput(dparent); |
| dparent = dchild; |
| len = 0; |
| pstart = full_path + i + 1; |
| full_path[i] = sep; |
| } |
| out: |
| _FreeXid(xid); |
| kfree(full_path); |
| return dparent; |
| } |
| |
| static struct dentry * |
| cifs_do_mount(struct file_system_type *fs_type, |
| int flags, const char *dev_name, void *data) |
| { |
| int rc; |
| struct super_block *sb; |
| struct cifs_sb_info *cifs_sb; |
| struct smb_vol *volume_info; |
| struct cifs_mnt_data mnt_data; |
| struct dentry *root; |
| |
| cFYI(1, "Devname: %s flags: %d ", dev_name, flags); |
| |
| rc = cifs_setup_volume_info(&volume_info, (char *)data, dev_name); |
| if (rc) |
| return ERR_PTR(rc); |
| |
| cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL); |
| if (cifs_sb == NULL) { |
| root = ERR_PTR(-ENOMEM); |
| goto out; |
| } |
| |
| cifs_setup_cifs_sb(volume_info, cifs_sb); |
| |
| mnt_data.vol = volume_info; |
| mnt_data.cifs_sb = cifs_sb; |
| mnt_data.flags = flags; |
| |
| sb = sget(fs_type, cifs_match_super, set_anon_super, &mnt_data); |
| if (IS_ERR(sb)) { |
| root = ERR_CAST(sb); |
| goto out_cifs_sb; |
| } |
| |
| if (sb->s_fs_info) { |
| cFYI(1, "Use existing superblock"); |
| goto out_shared; |
| } |
| |
| /* |
| * Copy mount params for use in submounts. Better to do |
| * the copy here and deal with the error before cleanup gets |
| * complicated post-mount. |
| */ |
| cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL); |
| if (cifs_sb->mountdata == NULL) { |
| root = ERR_PTR(-ENOMEM); |
| goto out_super; |
| } |
| |
| sb->s_flags = flags; |
| /* BB should we make this contingent on mount parm? */ |
| sb->s_flags |= MS_NODIRATIME | MS_NOATIME; |
| sb->s_fs_info = cifs_sb; |
| |
| rc = cifs_read_super(sb, volume_info, dev_name, |
| flags & MS_SILENT ? 1 : 0); |
| if (rc) { |
| root = ERR_PTR(rc); |
| goto out_super; |
| } |
| |
| sb->s_flags |= MS_ACTIVE; |
| |
| root = cifs_get_root(volume_info, sb); |
| if (root == NULL) |
| goto out_super; |
| |
| cFYI(1, "dentry root is: %p", root); |
| goto out; |
| |
| out_shared: |
| root = cifs_get_root(volume_info, sb); |
| if (root) |
| cFYI(1, "dentry root is: %p", root); |
| goto out; |
| |
| out_super: |
| kfree(cifs_sb->mountdata); |
| deactivate_locked_super(sb); |
| |
| out_cifs_sb: |
| unload_nls(cifs_sb->local_nls); |
| kfree(cifs_sb); |
| |
| out: |
| cifs_cleanup_volume_info(&volume_info); |
| return root; |
| } |
| |
| static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov, |
| unsigned long nr_segs, loff_t pos) |
| { |
| struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode; |
| ssize_t written; |
| int rc; |
| |
| written = generic_file_aio_write(iocb, iov, nr_segs, pos); |
| |
| if (CIFS_I(inode)->clientCanCacheAll) |
| return written; |
| |
| rc = filemap_fdatawrite(inode->i_mapping); |
| if (rc) |
| cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode); |
| |
| return written; |
| } |
| |
| static loff_t cifs_llseek(struct file *file, loff_t offset, int origin) |
| { |
| /* origin == SEEK_END => we must revalidate the cached file length */ |
| if (origin == SEEK_END) { |
| int rc; |
| struct inode *inode = file->f_path.dentry->d_inode; |
| |
| /* |
| * We need to be sure that all dirty pages are written and the |
| * server has the newest file length. |
| */ |
| if (!CIFS_I(inode)->clientCanCacheRead && inode->i_mapping && |
| inode->i_mapping->nrpages != 0) { |
| rc = filemap_fdatawait(inode->i_mapping); |
| if (rc) { |
| mapping_set_error(inode->i_mapping, rc); |
| return rc; |
| } |
| } |
| /* |
| * 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(inode)->time = 0; |
| |
| rc = cifs_revalidate_file_attr(file); |
| if (rc < 0) |
| return (loff_t)rc; |
| } |
| return generic_file_llseek_unlocked(file, offset, origin); |
| } |
| |
| static int cifs_setlease(struct file *file, long arg, struct file_lock **lease) |
| { |
| /* note that this is called by vfs setlease with lock_flocks held |
| to protect *lease from going away */ |
| struct inode *inode = file->f_path.dentry->d_inode; |
| struct cifsFileInfo *cfile = file->private_data; |
| |
| if (!(S_ISREG(inode->i_mode))) |
| return -EINVAL; |
| |
| /* check if file is oplocked */ |
| if (((arg == F_RDLCK) && |
| (CIFS_I(inode)->clientCanCacheRead)) || |
| ((arg == F_WRLCK) && |
| (CIFS_I(inode)->clientCanCacheAll))) |
| return generic_setlease(file, arg, lease); |
| else if (tlink_tcon(cfile->tlink)->local_lease && |
| !CIFS_I(inode)->clientCanCacheRead) |
| /* If the server claims to support oplock on this |
| file, then we still need to check oplock even |
| if the local_lease mount option is set, but there |
| are servers which do not support oplock for which |
| this mount option may be useful if the user |
| knows that the file won't be changed on the server |
| by anyone else */ |
| return generic_setlease(file, arg, lease); |
| else |
| return -EAGAIN; |
| } |
| |
| struct file_system_type cifs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "cifs", |
| .mount = cifs_do_mount, |
| .kill_sb = kill_anon_super, |
| /* .fs_flags */ |
| }; |
| const struct inode_operations cifs_dir_inode_ops = { |
| .create = cifs_create, |
| .lookup = cifs_lookup, |
| .getattr = cifs_getattr, |
| .unlink = cifs_unlink, |
| .link = cifs_hardlink, |
| .mkdir = cifs_mkdir, |
| .rmdir = cifs_rmdir, |
| .rename = cifs_rename, |
| .permission = cifs_permission, |
| /* revalidate:cifs_revalidate, */ |
| .setattr = cifs_setattr, |
| .symlink = cifs_symlink, |
| .mknod = cifs_mknod, |
| #ifdef CONFIG_CIFS_XATTR |
| .setxattr = cifs_setxattr, |
| .getxattr = cifs_getxattr, |
| .listxattr = cifs_listxattr, |
| .removexattr = cifs_removexattr, |
| #endif |
| }; |
| |
| const struct inode_operations cifs_file_inode_ops = { |
| /* revalidate:cifs_revalidate, */ |
| .setattr = cifs_setattr, |
| .getattr = cifs_getattr, /* do we need this anymore? */ |
| .rename = cifs_rename, |
| .permission = cifs_permission, |
| #ifdef CONFIG_CIFS_XATTR |
| .setxattr = cifs_setxattr, |
| .getxattr = cifs_getxattr, |
| .listxattr = cifs_listxattr, |
| .removexattr = cifs_removexattr, |
| #endif |
| }; |
| |
| const struct inode_operations cifs_symlink_inode_ops = { |
| .readlink = generic_readlink, |
| .follow_link = cifs_follow_link, |
| .put_link = cifs_put_link, |
| .permission = cifs_permission, |
| /* BB add the following two eventually */ |
| /* revalidate: cifs_revalidate, |
| setattr: cifs_notify_change, *//* BB do we need notify change */ |
| #ifdef CONFIG_CIFS_XATTR |
| .setxattr = cifs_setxattr, |
| .getxattr = cifs_getxattr, |
| .listxattr = cifs_listxattr, |
| .removexattr = cifs_removexattr, |
| #endif |
| }; |
| |
| const struct file_operations cifs_file_ops = { |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .aio_read = generic_file_aio_read, |
| .aio_write = cifs_file_aio_write, |
| .open = cifs_open, |
| .release = cifs_close, |
| .lock = cifs_lock, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| .llseek = cifs_llseek, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| .setlease = cifs_setlease, |
| }; |
| |
| const struct file_operations cifs_file_strict_ops = { |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .aio_read = cifs_strict_readv, |
| .aio_write = cifs_strict_writev, |
| .open = cifs_open, |
| .release = cifs_close, |
| .lock = cifs_lock, |
| .fsync = cifs_strict_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_strict_mmap, |
| .splice_read = generic_file_splice_read, |
| .llseek = cifs_llseek, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| .setlease = cifs_setlease, |
| }; |
| |
| const struct file_operations cifs_file_direct_ops = { |
| /* BB reevaluate whether they can be done with directio, no cache */ |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .aio_read = cifs_user_readv, |
| .aio_write = cifs_user_writev, |
| .open = cifs_open, |
| .release = cifs_close, |
| .lock = cifs_lock, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| .llseek = cifs_llseek, |
| .setlease = cifs_setlease, |
| }; |
| |
| const struct file_operations cifs_file_nobrl_ops = { |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .aio_read = generic_file_aio_read, |
| .aio_write = cifs_file_aio_write, |
| .open = cifs_open, |
| .release = cifs_close, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| .llseek = cifs_llseek, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| .setlease = cifs_setlease, |
| }; |
| |
| const struct file_operations cifs_file_strict_nobrl_ops = { |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .aio_read = cifs_strict_readv, |
| .aio_write = cifs_strict_writev, |
| .open = cifs_open, |
| .release = cifs_close, |
| .fsync = cifs_strict_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_strict_mmap, |
| .splice_read = generic_file_splice_read, |
| .llseek = cifs_llseek, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| .setlease = cifs_setlease, |
| }; |
| |
| const struct file_operations cifs_file_direct_nobrl_ops = { |
| /* BB reevaluate whether they can be done with directio, no cache */ |
| .read = do_sync_read, |
| .write = do_sync_write, |
| .aio_read = cifs_user_readv, |
| .aio_write = cifs_user_writev, |
| .open = cifs_open, |
| .release = cifs_close, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| #ifdef CONFIG_CIFS_POSIX |
| .unlocked_ioctl = cifs_ioctl, |
| #endif /* CONFIG_CIFS_POSIX */ |
| .llseek = cifs_llseek, |
| .setlease = cifs_setlease, |
| }; |
| |
| const struct file_operations cifs_dir_ops = { |
| .readdir = cifs_readdir, |
| .release = cifs_closedir, |
| .read = generic_read_dir, |
| .unlocked_ioctl = cifs_ioctl, |
| .llseek = generic_file_llseek, |
| }; |
| |
| static void |
| cifs_init_once(void *inode) |
| { |
| struct cifsInodeInfo *cifsi = inode; |
| |
| inode_init_once(&cifsi->vfs_inode); |
| INIT_LIST_HEAD(&cifsi->lockList); |
| } |
| |
| static int |
| cifs_init_inodecache(void) |
| { |
| cifs_inode_cachep = kmem_cache_create("cifs_inode_cache", |
| sizeof(struct cifsInodeInfo), |
| 0, (SLAB_RECLAIM_ACCOUNT| |
| SLAB_MEM_SPREAD), |
| cifs_init_once); |
| if (cifs_inode_cachep == NULL) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void |
| cifs_destroy_inodecache(void) |
| { |
| kmem_cache_destroy(cifs_inode_cachep); |
| } |
| |
| static int |
| cifs_init_request_bufs(void) |
| { |
| if (CIFSMaxBufSize < 8192) { |
| /* Buffer size can not be smaller than 2 * PATH_MAX since maximum |
| Unicode path name has to fit in any SMB/CIFS path based frames */ |
| CIFSMaxBufSize = 8192; |
| } else if (CIFSMaxBufSize > 1024*127) { |
| CIFSMaxBufSize = 1024 * 127; |
| } else { |
| CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/ |
| } |
| /* cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */ |
| cifs_req_cachep = kmem_cache_create("cifs_request", |
| CIFSMaxBufSize + |
| MAX_CIFS_HDR_SIZE, 0, |
| SLAB_HWCACHE_ALIGN, NULL); |
| if (cifs_req_cachep == NULL) |
| return -ENOMEM; |
| |
| if (cifs_min_rcv < 1) |
| cifs_min_rcv = 1; |
| else if (cifs_min_rcv > 64) { |
| cifs_min_rcv = 64; |
| cERROR(1, "cifs_min_rcv set to maximum (64)"); |
| } |
| |
| cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv, |
| cifs_req_cachep); |
| |
| if (cifs_req_poolp == NULL) { |
| kmem_cache_destroy(cifs_req_cachep); |
| return -ENOMEM; |
| } |
| /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and |
| almost all handle based requests (but not write response, nor is it |
| sufficient for path based requests). A smaller size would have |
| been more efficient (compacting multiple slab items on one 4k page) |
| for the case in which debug was on, but this larger size allows |
| more SMBs to use small buffer alloc and is still much more |
| efficient to alloc 1 per page off the slab compared to 17K (5page) |
| alloc of large cifs buffers even when page debugging is on */ |
| cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq", |
| MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN, |
| NULL); |
| if (cifs_sm_req_cachep == NULL) { |
| mempool_destroy(cifs_req_poolp); |
| kmem_cache_destroy(cifs_req_cachep); |
| return -ENOMEM; |
| } |
| |
| if (cifs_min_small < 2) |
| cifs_min_small = 2; |
| else if (cifs_min_small > 256) { |
| cifs_min_small = 256; |
| cFYI(1, "cifs_min_small set to maximum (256)"); |
| } |
| |
| cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small, |
| cifs_sm_req_cachep); |
| |
| if (cifs_sm_req_poolp == NULL) { |
| mempool_destroy(cifs_req_poolp); |
| kmem_cache_destroy(cifs_req_cachep); |
| kmem_cache_destroy(cifs_sm_req_cachep); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static void |
| cifs_destroy_request_bufs(void) |
| { |
| mempool_destroy(cifs_req_poolp); |
| kmem_cache_destroy(cifs_req_cachep); |
| mempool_destroy(cifs_sm_req_poolp); |
| kmem_cache_destroy(cifs_sm_req_cachep); |
| } |
| |
| static int |
| cifs_init_mids(void) |
| { |
| cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids", |
| sizeof(struct mid_q_entry), 0, |
| SLAB_HWCACHE_ALIGN, NULL); |
| if (cifs_mid_cachep == NULL) |
| return -ENOMEM; |
| |
| /* 3 is a reasonable minimum number of simultaneous operations */ |
| cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep); |
| if (cifs_mid_poolp == NULL) { |
| kmem_cache_destroy(cifs_mid_cachep); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static void |
| cifs_destroy_mids(void) |
| { |
| mempool_destroy(cifs_mid_poolp); |
| kmem_cache_destroy(cifs_mid_cachep); |
| } |
| |
| static int __init |
| init_cifs(void) |
| { |
| int rc = 0; |
| cifs_proc_init(); |
| INIT_LIST_HEAD(&cifs_tcp_ses_list); |
| #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */ |
| INIT_LIST_HEAD(&GlobalDnotifyReqList); |
| INIT_LIST_HEAD(&GlobalDnotifyRsp_Q); |
| #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */ |
| /* |
| * Initialize Global counters |
| */ |
| atomic_set(&sesInfoAllocCount, 0); |
| atomic_set(&tconInfoAllocCount, 0); |
| atomic_set(&tcpSesAllocCount, 0); |
| atomic_set(&tcpSesReconnectCount, 0); |
| atomic_set(&tconInfoReconnectCount, 0); |
| |
| atomic_set(&bufAllocCount, 0); |
| atomic_set(&smBufAllocCount, 0); |
| #ifdef CONFIG_CIFS_STATS2 |
| atomic_set(&totBufAllocCount, 0); |
| atomic_set(&totSmBufAllocCount, 0); |
| #endif /* CONFIG_CIFS_STATS2 */ |
| |
| atomic_set(&midCount, 0); |
| GlobalCurrentXid = 0; |
| GlobalTotalActiveXid = 0; |
| GlobalMaxActiveXid = 0; |
| spin_lock_init(&cifs_tcp_ses_lock); |
| spin_lock_init(&cifs_file_list_lock); |
| spin_lock_init(&GlobalMid_Lock); |
| |
| if (cifs_max_pending < 2) { |
| cifs_max_pending = 2; |
| cFYI(1, "cifs_max_pending set to min of 2"); |
| } else if (cifs_max_pending > 256) { |
| cifs_max_pending = 256; |
| cFYI(1, "cifs_max_pending set to max of 256"); |
| } |
| |
| rc = cifs_fscache_register(); |
| if (rc) |
| goto out_clean_proc; |
| |
| rc = cifs_init_inodecache(); |
| if (rc) |
| goto out_unreg_fscache; |
| |
| rc = cifs_init_mids(); |
| if (rc) |
| goto out_destroy_inodecache; |
| |
| rc = cifs_init_request_bufs(); |
| if (rc) |
| goto out_destroy_mids; |
| |
| #ifdef CONFIG_CIFS_UPCALL |
| rc = register_key_type(&cifs_spnego_key_type); |
| if (rc) |
| goto out_destroy_request_bufs; |
| #endif /* CONFIG_CIFS_UPCALL */ |
| |
| #ifdef CONFIG_CIFS_ACL |
| rc = init_cifs_idmap(); |
| if (rc) |
| goto out_register_key_type; |
| #endif /* CONFIG_CIFS_ACL */ |
| |
| rc = register_filesystem(&cifs_fs_type); |
| if (rc) |
| goto out_init_cifs_idmap; |
| |
| return 0; |
| |
| out_init_cifs_idmap: |
| #ifdef CONFIG_CIFS_ACL |
| exit_cifs_idmap(); |
| out_register_key_type: |
| #endif |
| #ifdef CONFIG_CIFS_UPCALL |
| unregister_key_type(&cifs_spnego_key_type); |
| out_destroy_request_bufs: |
| #endif |
| cifs_destroy_request_bufs(); |
| out_destroy_mids: |
| cifs_destroy_mids(); |
| out_destroy_inodecache: |
| cifs_destroy_inodecache(); |
| out_unreg_fscache: |
| cifs_fscache_unregister(); |
| out_clean_proc: |
| cifs_proc_clean(); |
| return rc; |
| } |
| |
| static void __exit |
| exit_cifs(void) |
| { |
| cFYI(DBG2, "exit_cifs"); |
| cifs_proc_clean(); |
| cifs_fscache_unregister(); |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| cifs_dfs_release_automount_timer(); |
| #endif |
| #ifdef CONFIG_CIFS_ACL |
| cifs_destroy_idmaptrees(); |
| exit_cifs_idmap(); |
| #endif |
| #ifdef CONFIG_CIFS_UPCALL |
| unregister_key_type(&cifs_spnego_key_type); |
| #endif |
| unregister_filesystem(&cifs_fs_type); |
| cifs_destroy_inodecache(); |
| cifs_destroy_mids(); |
| cifs_destroy_request_bufs(); |
| } |
| |
| MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>"); |
| MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */ |
| MODULE_DESCRIPTION |
| ("VFS to access servers complying with the SNIA CIFS Specification " |
| "e.g. Samba and Windows"); |
| MODULE_VERSION(CIFS_VERSION); |
| module_init(init_cifs) |
| module_exit(exit_cifs) |