| // SPDX-License-Identifier: LGPL-2.1 |
| /* |
| * 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 |
| * |
| */ |
| |
| /* 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/namei.h> |
| #include <linux/random.h> |
| #include <linux/uuid.h> |
| #include <linux/xattr.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" |
| #include "smb2pdu.h" |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| #include "dfs_cache.h" |
| #endif |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| #include "netlink.h" |
| #endif |
| #include "fs_context.h" |
| |
| /* |
| * DOS dates from 1980/1/1 through 2107/12/31 |
| * Protocol specifications indicate the range should be to 119, which |
| * limits maximum year to 2099. But this range has not been checked. |
| */ |
| #define SMB_DATE_MAX (127<<9 | 12<<5 | 31) |
| #define SMB_DATE_MIN (0<<9 | 1<<5 | 1) |
| #define SMB_TIME_MAX (23<<11 | 59<<5 | 29) |
| |
| int cifsFYI = 0; |
| bool traceSMB; |
| bool enable_oplocks = true; |
| bool linuxExtEnabled = true; |
| bool lookupCacheEnabled = true; |
| bool disable_legacy_dialects; /* false by default */ |
| bool enable_gcm_256 = true; |
| bool require_gcm_256; /* false by default */ |
| 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, uint, 0444); |
| MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header) " |
| "for CIFS requests. " |
| "Default: 16384 Range: 8192 to 130048"); |
| unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL; |
| module_param(cifs_min_rcv, uint, 0444); |
| 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, uint, 0444); |
| 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, uint, 0444); |
| MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for " |
| "CIFS/SMB1 dialect (N/A for SMB3) " |
| "Default: 32767 Range: 2 to 32767."); |
| #ifdef CONFIG_CIFS_STATS2 |
| unsigned int slow_rsp_threshold = 1; |
| module_param(slow_rsp_threshold, uint, 0644); |
| MODULE_PARM_DESC(slow_rsp_threshold, "Amount of time (in seconds) to wait " |
| "before logging that a response is delayed. " |
| "Default: 1 (if set to 0 disables msg)."); |
| #endif /* STATS2 */ |
| |
| module_param(enable_oplocks, bool, 0644); |
| MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1"); |
| |
| module_param(enable_gcm_256, bool, 0644); |
| MODULE_PARM_DESC(enable_gcm_256, "Enable requesting strongest (256 bit) GCM encryption. Default: n/N/0"); |
| |
| module_param(require_gcm_256, bool, 0644); |
| MODULE_PARM_DESC(require_gcm_256, "Require strongest (256 bit) GCM encryption. Default: n/N/0"); |
| |
| module_param(disable_legacy_dialects, bool, 0644); |
| MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be " |
| "helpful to restrict the ability to " |
| "override the default dialects (SMB2.1, " |
| "SMB3 and SMB3.02) on mount with old " |
| "dialects (CIFS/SMB1 and SMB2) since " |
| "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker" |
| " and less secure. Default: n/N/0"); |
| |
| extern mempool_t *cifs_sm_req_poolp; |
| extern mempool_t *cifs_req_poolp; |
| extern mempool_t *cifs_mid_poolp; |
| |
| struct workqueue_struct *cifsiod_wq; |
| struct workqueue_struct *decrypt_wq; |
| struct workqueue_struct *fileinfo_put_wq; |
| struct workqueue_struct *cifsoplockd_wq; |
| struct workqueue_struct *deferredclose_wq; |
| __u32 cifs_lock_secret; |
| |
| /* |
| * Bumps refcount for cifs super block. |
| * Note that it should be only called if a referece to VFS super block is |
| * already held, e.g. in open-type syscalls context. Otherwise it can race with |
| * atomic_dec_and_test in deactivate_locked_super. |
| */ |
| 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 inode *inode; |
| struct cifs_sb_info *cifs_sb; |
| struct cifs_tcon *tcon; |
| struct timespec64 ts; |
| int rc = 0; |
| |
| cifs_sb = CIFS_SB(sb); |
| tcon = cifs_sb_master_tcon(cifs_sb); |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL) |
| sb->s_flags |= SB_POSIXACL; |
| |
| if (tcon->snapshot_time) |
| sb->s_flags |= SB_RDONLY; |
| |
| if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files) |
| sb->s_maxbytes = MAX_LFS_FILESIZE; |
| else |
| sb->s_maxbytes = MAX_NON_LFS; |
| |
| /* |
| * Some very old servers like DOS and OS/2 used 2 second granularity |
| * (while all current servers use 100ns granularity - see MS-DTYP) |
| * but 1 second is the maximum allowed granularity for the VFS |
| * so for old servers set time granularity to 1 second while for |
| * everything else (current servers) set it to 100ns. |
| */ |
| if ((tcon->ses->server->vals->protocol_id == SMB10_PROT_ID) && |
| ((tcon->ses->capabilities & |
| tcon->ses->server->vals->cap_nt_find) == 0) && |
| !tcon->unix_ext) { |
| sb->s_time_gran = 1000000000; /* 1 second is max allowed gran */ |
| ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MIN), 0, 0); |
| sb->s_time_min = ts.tv_sec; |
| ts = cnvrtDosUnixTm(cpu_to_le16(SMB_DATE_MAX), |
| cpu_to_le16(SMB_TIME_MAX), 0); |
| sb->s_time_max = ts.tv_sec; |
| } else { |
| /* |
| * Almost every server, including all SMB2+, uses DCE TIME |
| * ie 100 nanosecond units, since 1601. See MS-DTYP and MS-FSCC |
| */ |
| sb->s_time_gran = 100; |
| ts = cifs_NTtimeToUnix(0); |
| sb->s_time_min = ts.tv_sec; |
| ts = cifs_NTtimeToUnix(cpu_to_le64(S64_MAX)); |
| sb->s_time_max = ts.tv_sec; |
| } |
| |
| sb->s_magic = CIFS_MAGIC_NUMBER; |
| sb->s_op = &cifs_super_ops; |
| sb->s_xattr = cifs_xattr_handlers; |
| rc = super_setup_bdi(sb); |
| if (rc) |
| goto out_no_root; |
| /* tune readahead according to rsize if readahead size not set on mount */ |
| if (cifs_sb->ctx->rasize) |
| sb->s_bdi->ra_pages = cifs_sb->ctx->rasize / PAGE_SIZE; |
| else |
| sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE; |
| |
| 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); |
| goto out_no_root; |
| } |
| |
| if (tcon->nocase) |
| sb->s_d_op = &cifs_ci_dentry_ops; |
| else |
| sb->s_d_op = &cifs_dentry_ops; |
| |
| sb->s_root = d_make_root(inode); |
| if (!sb->s_root) { |
| rc = -ENOMEM; |
| goto out_no_root; |
| } |
| |
| #ifdef CONFIG_CIFS_NFSD_EXPORT |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { |
| cifs_dbg(FYI, "export ops supported\n"); |
| sb->s_export_op = &cifs_export_ops; |
| } |
| #endif /* CONFIG_CIFS_NFSD_EXPORT */ |
| |
| return 0; |
| |
| out_no_root: |
| cifs_dbg(VFS, "%s: get root inode failed\n", __func__); |
| return rc; |
| } |
| |
| static void cifs_kill_sb(struct super_block *sb) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| struct cifs_tcon *tcon; |
| struct cached_fid *cfid; |
| |
| /* |
| * We ned to release all dentries for the cached directories |
| * before we kill the sb. |
| */ |
| if (cifs_sb->root) { |
| dput(cifs_sb->root); |
| cifs_sb->root = NULL; |
| } |
| tcon = cifs_sb_master_tcon(cifs_sb); |
| if (tcon) { |
| cfid = &tcon->crfid; |
| mutex_lock(&cfid->fid_mutex); |
| if (cfid->dentry) { |
| |
| dput(cfid->dentry); |
| cfid->dentry = NULL; |
| } |
| mutex_unlock(&cfid->fid_mutex); |
| } |
| |
| kill_anon_super(sb); |
| cifs_umount(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); |
| struct TCP_Server_Info *server = tcon->ses->server; |
| unsigned int xid; |
| int rc = 0; |
| |
| xid = get_xid(); |
| |
| if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0) |
| buf->f_namelen = |
| le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength); |
| else |
| buf->f_namelen = PATH_MAX; |
| |
| buf->f_fsid.val[0] = tcon->vol_serial_number; |
| /* are using part of create time for more randomness, see man statfs */ |
| buf->f_fsid.val[1] = (int)le64_to_cpu(tcon->vol_create_time); |
| |
| buf->f_files = 0; /* undefined */ |
| buf->f_ffree = 0; /* unlimited */ |
| |
| if (server->ops->queryfs) |
| rc = server->ops->queryfs(xid, tcon, cifs_sb, buf); |
| |
| free_xid(xid); |
| return rc; |
| } |
| |
| static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); |
| struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| struct TCP_Server_Info *server = tcon->ses->server; |
| |
| if (server->ops->fallocate) |
| return server->ops->fallocate(file, tcon, mode, off, len); |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static int cifs_permission(struct user_namespace *mnt_userns, |
| 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(&init_user_ns, inode, mask); |
| } |
| |
| 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->flags = 0; |
| spin_lock_init(&cifs_inode->writers_lock); |
| cifs_inode->writers = 0; |
| 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; |
| cifs_inode->epoch = 0; |
| spin_lock_init(&cifs_inode->open_file_lock); |
| generate_random_uuid(cifs_inode->lease_key); |
| |
| /* |
| * 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); |
| INIT_LIST_HEAD(&cifs_inode->llist); |
| INIT_LIST_HEAD(&cifs_inode->deferred_closes); |
| spin_lock_init(&cifs_inode->deferred_lock); |
| return &cifs_inode->vfs_inode; |
| } |
| |
| static void |
| cifs_free_inode(struct inode *inode) |
| { |
| kmem_cache_free(cifs_inode_cachep, CIFS_I(inode)); |
| } |
| |
| static void |
| cifs_evict_inode(struct inode *inode) |
| { |
| truncate_inode_pages_final(&inode->i_data); |
| clear_inode(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_puts(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_puts(s, "(unknown)"); |
| } |
| if (server->rdma) |
| seq_puts(s, ",rdma"); |
| } |
| |
| static void |
| cifs_show_security(struct seq_file *s, struct cifs_ses *ses) |
| { |
| if (ses->sectype == Unspecified) { |
| if (ses->user_name == NULL) |
| seq_puts(s, ",sec=none"); |
| return; |
| } |
| |
| seq_puts(s, ",sec="); |
| |
| switch (ses->sectype) { |
| case LANMAN: |
| seq_puts(s, "lanman"); |
| break; |
| case NTLMv2: |
| seq_puts(s, "ntlmv2"); |
| break; |
| case NTLM: |
| seq_puts(s, "ntlm"); |
| break; |
| case Kerberos: |
| seq_puts(s, "krb5"); |
| break; |
| case RawNTLMSSP: |
| seq_puts(s, "ntlmssp"); |
| break; |
| default: |
| /* shouldn't ever happen */ |
| seq_puts(s, "unknown"); |
| break; |
| } |
| |
| if (ses->sign) |
| seq_puts(s, "i"); |
| |
| if (ses->sectype == Kerberos) |
| seq_printf(s, ",cruid=%u", |
| from_kuid_munged(&init_user_ns, ses->cred_uid)); |
| } |
| |
| static void |
| cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb) |
| { |
| seq_puts(s, ",cache="); |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
| seq_puts(s, "strict"); |
| else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) |
| seq_puts(s, "none"); |
| else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RW_CACHE) |
| seq_puts(s, "singleclient"); /* assume only one client access */ |
| else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) |
| seq_puts(s, "ro"); /* read only caching assumed */ |
| else |
| seq_puts(s, "loose"); |
| } |
| |
| /* |
| * cifs_show_devname() is used so we show the mount device name with correct |
| * format (e.g. forward slashes vs. back slashes) in /proc/mounts |
| */ |
| static int cifs_show_devname(struct seq_file *m, struct dentry *root) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb); |
| char *devname = kstrdup(cifs_sb->ctx->source, GFP_KERNEL); |
| |
| if (devname == NULL) |
| seq_puts(m, "none"); |
| else { |
| convert_delimiter(devname, '/'); |
| /* escape all spaces in share names */ |
| seq_escape(m, devname, " \t"); |
| kfree(devname); |
| } |
| return 0; |
| } |
| |
| /* |
| * 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 dentry *root) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb); |
| struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); |
| struct sockaddr *srcaddr; |
| srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr; |
| |
| seq_show_option(s, "vers", tcon->ses->server->vals->version_string); |
| cifs_show_security(s, tcon->ses); |
| cifs_show_cache_flavor(s, cifs_sb); |
| |
| if (tcon->no_lease) |
| seq_puts(s, ",nolease"); |
| if (cifs_sb->ctx->multiuser) |
| seq_puts(s, ",multiuser"); |
| else if (tcon->ses->user_name) |
| seq_show_option(s, "username", tcon->ses->user_name); |
| |
| if (tcon->ses->domainName && tcon->ses->domainName[0] != 0) |
| seq_show_option(s, "domain", 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=%u", |
| from_kuid_munged(&init_user_ns, cifs_sb->ctx->linux_uid)); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) |
| seq_puts(s, ",forceuid"); |
| else |
| seq_puts(s, ",noforceuid"); |
| |
| seq_printf(s, ",gid=%u", |
| from_kgid_munged(&init_user_ns, cifs_sb->ctx->linux_gid)); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) |
| seq_puts(s, ",forcegid"); |
| else |
| seq_puts(s, ",noforcegid"); |
| |
| cifs_show_address(s, tcon->ses->server); |
| |
| if (!tcon->unix_ext) |
| seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho", |
| cifs_sb->ctx->file_mode, |
| cifs_sb->ctx->dir_mode); |
| if (cifs_sb->ctx->iocharset) |
| seq_printf(s, ",iocharset=%s", cifs_sb->ctx->iocharset); |
| if (tcon->seal) |
| seq_puts(s, ",seal"); |
| else if (tcon->ses->server->ignore_signature) |
| seq_puts(s, ",signloosely"); |
| if (tcon->nocase) |
| seq_puts(s, ",nocase"); |
| if (tcon->nodelete) |
| seq_puts(s, ",nodelete"); |
| if (tcon->local_lease) |
| seq_puts(s, ",locallease"); |
| if (tcon->retry) |
| seq_puts(s, ",hard"); |
| else |
| seq_puts(s, ",soft"); |
| if (tcon->use_persistent) |
| seq_puts(s, ",persistenthandles"); |
| else if (tcon->use_resilient) |
| seq_puts(s, ",resilienthandles"); |
| if (tcon->posix_extensions) |
| seq_puts(s, ",posix"); |
| else if (tcon->unix_ext) |
| seq_puts(s, ",unix"); |
| else |
| seq_puts(s, ",nounix"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) |
| seq_puts(s, ",nodfs"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) |
| seq_puts(s, ",posixpaths"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) |
| seq_puts(s, ",setuids"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL) |
| seq_puts(s, ",idsfromsid"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) |
| seq_puts(s, ",serverino"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| seq_puts(s, ",rwpidforward"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) |
| seq_puts(s, ",forcemand"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR) |
| seq_puts(s, ",nouser_xattr"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) |
| seq_puts(s, ",mapchars"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) |
| seq_puts(s, ",mapposix"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL) |
| seq_puts(s, ",sfu"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| seq_puts(s, ",nobrl"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_HANDLE_CACHE) |
| seq_puts(s, ",nohandlecache"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) |
| seq_puts(s, ",modefromsid"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) |
| seq_puts(s, ",cifsacl"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM) |
| seq_puts(s, ",dynperm"); |
| if (root->d_sb->s_flags & SB_POSIXACL) |
| seq_puts(s, ",acl"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) |
| seq_puts(s, ",mfsymlinks"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE) |
| seq_puts(s, ",fsc"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC) |
| seq_puts(s, ",nostrictsync"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) |
| seq_puts(s, ",noperm"); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) |
| seq_printf(s, ",backupuid=%u", |
| from_kuid_munged(&init_user_ns, |
| cifs_sb->ctx->backupuid)); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) |
| seq_printf(s, ",backupgid=%u", |
| from_kgid_munged(&init_user_ns, |
| cifs_sb->ctx->backupgid)); |
| |
| seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize); |
| seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize); |
| seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize); |
| if (cifs_sb->ctx->rasize) |
| seq_printf(s, ",rasize=%u", cifs_sb->ctx->rasize); |
| if (tcon->ses->server->min_offload) |
| seq_printf(s, ",esize=%u", tcon->ses->server->min_offload); |
| seq_printf(s, ",echo_interval=%lu", |
| tcon->ses->server->echo_interval / HZ); |
| |
| /* Only display max_credits if it was overridden on mount */ |
| if (tcon->ses->server->max_credits != SMB2_MAX_CREDITS_AVAILABLE) |
| seq_printf(s, ",max_credits=%u", tcon->ses->server->max_credits); |
| |
| if (tcon->snapshot_time) |
| seq_printf(s, ",snapshot=%llu", tcon->snapshot_time); |
| if (tcon->handle_timeout) |
| seq_printf(s, ",handletimeout=%u", tcon->handle_timeout); |
| |
| /* |
| * Display file and directory attribute timeout in seconds. |
| * If file and directory attribute timeout the same then actimeo |
| * was likely specified on mount |
| */ |
| if (cifs_sb->ctx->acdirmax == cifs_sb->ctx->acregmax) |
| seq_printf(s, ",actimeo=%lu", cifs_sb->ctx->acregmax / HZ); |
| else { |
| seq_printf(s, ",acdirmax=%lu", cifs_sb->ctx->acdirmax / HZ); |
| seq_printf(s, ",acregmax=%lu", cifs_sb->ctx->acregmax / HZ); |
| } |
| |
| if (tcon->ses->chan_max > 1) |
| seq_printf(s, ",multichannel,max_channels=%zu", |
| tcon->ses->chan_max); |
| |
| if (tcon->use_witness) |
| seq_puts(s, ",witness"); |
| |
| 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) { |
| cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n"); |
| 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 dentry *root) |
| { |
| /* BB FIXME */ |
| return 0; |
| } |
| #endif |
| |
| 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 = { |
| .statfs = cifs_statfs, |
| .alloc_inode = cifs_alloc_inode, |
| .free_inode = cifs_free_inode, |
| .drop_inode = cifs_drop_inode, |
| .evict_inode = cifs_evict_inode, |
| /* .show_path = cifs_show_path, */ /* Would we ever need show path? */ |
| .show_devname = cifs_show_devname, |
| /* .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, |
| #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 smb3_fs_context *ctx, struct super_block *sb) |
| { |
| struct dentry *dentry; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| char *full_path = NULL; |
| char *s, *p; |
| char sep; |
| |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) |
| return dget(sb->s_root); |
| |
| full_path = cifs_build_path_to_root(ctx, cifs_sb, |
| cifs_sb_master_tcon(cifs_sb), 0); |
| if (full_path == NULL) |
| return ERR_PTR(-ENOMEM); |
| |
| cifs_dbg(FYI, "Get root dentry for %s\n", full_path); |
| |
| sep = CIFS_DIR_SEP(cifs_sb); |
| dentry = dget(sb->s_root); |
| p = s = full_path; |
| |
| do { |
| struct inode *dir = d_inode(dentry); |
| struct dentry *child; |
| |
| if (!S_ISDIR(dir->i_mode)) { |
| dput(dentry); |
| dentry = ERR_PTR(-ENOTDIR); |
| break; |
| } |
| |
| /* skip separators */ |
| while (*s == sep) |
| s++; |
| if (!*s) |
| break; |
| p = s++; |
| /* next separator */ |
| while (*s && *s != sep) |
| s++; |
| |
| child = lookup_positive_unlocked(p, dentry, s - p); |
| dput(dentry); |
| dentry = child; |
| } while (!IS_ERR(dentry)); |
| kfree(full_path); |
| return dentry; |
| } |
| |
| static int cifs_set_super(struct super_block *sb, void *data) |
| { |
| struct cifs_mnt_data *mnt_data = data; |
| sb->s_fs_info = mnt_data->cifs_sb; |
| return set_anon_super(sb, NULL); |
| } |
| |
| struct dentry * |
| cifs_smb3_do_mount(struct file_system_type *fs_type, |
| int flags, struct smb3_fs_context *old_ctx) |
| { |
| int rc; |
| struct super_block *sb; |
| struct cifs_sb_info *cifs_sb = NULL; |
| struct cifs_mnt_data mnt_data; |
| struct dentry *root; |
| |
| /* |
| * Prints in Kernel / CIFS log the attempted mount operation |
| * If CIFS_DEBUG && cifs_FYI |
| */ |
| if (cifsFYI) |
| cifs_dbg(FYI, "Devname: %s flags: %d\n", old_ctx->UNC, flags); |
| else |
| cifs_info("Attempting to mount %s\n", old_ctx->UNC); |
| |
| cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL); |
| if (cifs_sb == NULL) { |
| root = ERR_PTR(-ENOMEM); |
| goto out; |
| } |
| |
| cifs_sb->ctx = kzalloc(sizeof(struct smb3_fs_context), GFP_KERNEL); |
| if (!cifs_sb->ctx) { |
| root = ERR_PTR(-ENOMEM); |
| goto out; |
| } |
| rc = smb3_fs_context_dup(cifs_sb->ctx, old_ctx); |
| if (rc) { |
| root = ERR_PTR(rc); |
| goto out; |
| } |
| |
| rc = cifs_setup_volume_info(cifs_sb->ctx, NULL, NULL); |
| if (rc) { |
| root = ERR_PTR(rc); |
| goto out; |
| } |
| |
| rc = cifs_setup_cifs_sb(cifs_sb); |
| if (rc) { |
| root = ERR_PTR(rc); |
| goto out; |
| } |
| |
| rc = cifs_mount(cifs_sb, cifs_sb->ctx); |
| if (rc) { |
| if (!(flags & SB_SILENT)) |
| cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n", |
| rc); |
| root = ERR_PTR(rc); |
| goto out; |
| } |
| |
| mnt_data.ctx = cifs_sb->ctx; |
| mnt_data.cifs_sb = cifs_sb; |
| mnt_data.flags = flags; |
| |
| /* BB should we make this contingent on mount parm? */ |
| flags |= SB_NODIRATIME | SB_NOATIME; |
| |
| sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data); |
| if (IS_ERR(sb)) { |
| root = ERR_CAST(sb); |
| cifs_umount(cifs_sb); |
| cifs_sb = NULL; |
| goto out; |
| } |
| |
| if (sb->s_root) { |
| cifs_dbg(FYI, "Use existing superblock\n"); |
| cifs_umount(cifs_sb); |
| cifs_sb = NULL; |
| } else { |
| rc = cifs_read_super(sb); |
| if (rc) { |
| root = ERR_PTR(rc); |
| goto out_super; |
| } |
| |
| sb->s_flags |= SB_ACTIVE; |
| } |
| |
| root = cifs_get_root(cifs_sb ? cifs_sb->ctx : old_ctx, sb); |
| if (IS_ERR(root)) |
| goto out_super; |
| |
| if (cifs_sb) |
| cifs_sb->root = dget(root); |
| |
| cifs_dbg(FYI, "dentry root is: %p\n", root); |
| return root; |
| |
| out_super: |
| deactivate_locked_super(sb); |
| out: |
| if (cifs_sb) { |
| kfree(cifs_sb->prepath); |
| smb3_cleanup_fs_context(cifs_sb->ctx); |
| kfree(cifs_sb); |
| } |
| return root; |
| } |
| |
| |
| static ssize_t |
| cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter) |
| { |
| ssize_t rc; |
| struct inode *inode = file_inode(iocb->ki_filp); |
| |
| if (iocb->ki_filp->f_flags & O_DIRECT) |
| return cifs_user_readv(iocb, iter); |
| |
| rc = cifs_revalidate_mapping(inode); |
| if (rc) |
| return rc; |
| |
| return generic_file_read_iter(iocb, iter); |
| } |
| |
| static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) |
| { |
| struct inode *inode = file_inode(iocb->ki_filp); |
| struct cifsInodeInfo *cinode = CIFS_I(inode); |
| ssize_t written; |
| int rc; |
| |
| if (iocb->ki_filp->f_flags & O_DIRECT) { |
| written = cifs_user_writev(iocb, from); |
| if (written > 0 && CIFS_CACHE_READ(cinode)) { |
| cifs_zap_mapping(inode); |
| cifs_dbg(FYI, |
| "Set no oplock for inode=%p after a write operation\n", |
| inode); |
| cinode->oplock = 0; |
| } |
| return written; |
| } |
| |
| written = cifs_get_writer(cinode); |
| if (written) |
| return written; |
| |
| written = generic_file_write_iter(iocb, from); |
| |
| if (CIFS_CACHE_WRITE(CIFS_I(inode))) |
| goto out; |
| |
| rc = filemap_fdatawrite(inode->i_mapping); |
| if (rc) |
| cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n", |
| rc, inode); |
| |
| out: |
| cifs_put_writer(cinode); |
| return written; |
| } |
| |
| static loff_t cifs_llseek(struct file *file, loff_t offset, int whence) |
| { |
| struct cifsFileInfo *cfile = file->private_data; |
| struct cifs_tcon *tcon; |
| |
| /* |
| * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate |
| * the cached file length |
| */ |
| if (whence != SEEK_SET && whence != SEEK_CUR) { |
| int rc; |
| struct inode *inode = file_inode(file); |
| |
| /* |
| * We need to be sure that all dirty pages are written and the |
| * server has the newest file length. |
| */ |
| if (!CIFS_CACHE_READ(CIFS_I(inode)) && 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; |
| } |
| if (cfile && cfile->tlink) { |
| tcon = tlink_tcon(cfile->tlink); |
| if (tcon->ses->server->ops->llseek) |
| return tcon->ses->server->ops->llseek(file, tcon, |
| offset, whence); |
| } |
| return generic_file_llseek(file, offset, whence); |
| } |
| |
| static int |
| cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv) |
| { |
| /* |
| * Note that this is called by vfs setlease with i_lock held to |
| * protect *lease from going away. |
| */ |
| struct inode *inode = file_inode(file); |
| struct cifsFileInfo *cfile = file->private_data; |
| |
| if (!(S_ISREG(inode->i_mode))) |
| return -EINVAL; |
| |
| /* Check if file is oplocked if this is request for new lease */ |
| if (arg == F_UNLCK || |
| ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) || |
| ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode)))) |
| return generic_setlease(file, arg, lease, priv); |
| else if (tlink_tcon(cfile->tlink)->local_lease && |
| !CIFS_CACHE_READ(CIFS_I(inode))) |
| /* |
| * 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, priv); |
| else |
| return -EAGAIN; |
| } |
| |
| struct file_system_type cifs_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "cifs", |
| .init_fs_context = smb3_init_fs_context, |
| .parameters = smb3_fs_parameters, |
| .kill_sb = cifs_kill_sb, |
| .fs_flags = FS_RENAME_DOES_D_MOVE, |
| }; |
| MODULE_ALIAS_FS("cifs"); |
| |
| static struct file_system_type smb3_fs_type = { |
| .owner = THIS_MODULE, |
| .name = "smb3", |
| .init_fs_context = smb3_init_fs_context, |
| .parameters = smb3_fs_parameters, |
| .kill_sb = cifs_kill_sb, |
| .fs_flags = FS_RENAME_DOES_D_MOVE, |
| }; |
| MODULE_ALIAS_FS("smb3"); |
| MODULE_ALIAS("smb3"); |
| |
| const struct inode_operations cifs_dir_inode_ops = { |
| .create = cifs_create, |
| .atomic_open = cifs_atomic_open, |
| .lookup = cifs_lookup, |
| .getattr = cifs_getattr, |
| .unlink = cifs_unlink, |
| .link = cifs_hardlink, |
| .mkdir = cifs_mkdir, |
| .rmdir = cifs_rmdir, |
| .rename = cifs_rename2, |
| .permission = cifs_permission, |
| .setattr = cifs_setattr, |
| .symlink = cifs_symlink, |
| .mknod = cifs_mknod, |
| .listxattr = cifs_listxattr, |
| }; |
| |
| const struct inode_operations cifs_file_inode_ops = { |
| .setattr = cifs_setattr, |
| .getattr = cifs_getattr, |
| .permission = cifs_permission, |
| .listxattr = cifs_listxattr, |
| .fiemap = cifs_fiemap, |
| }; |
| |
| const struct inode_operations cifs_symlink_inode_ops = { |
| .get_link = cifs_get_link, |
| .permission = cifs_permission, |
| .listxattr = cifs_listxattr, |
| }; |
| |
| static loff_t cifs_remap_file_range(struct file *src_file, loff_t off, |
| struct file *dst_file, loff_t destoff, loff_t len, |
| unsigned int remap_flags) |
| { |
| struct inode *src_inode = file_inode(src_file); |
| struct inode *target_inode = file_inode(dst_file); |
| struct cifsFileInfo *smb_file_src = src_file->private_data; |
| struct cifsFileInfo *smb_file_target; |
| struct cifs_tcon *target_tcon; |
| unsigned int xid; |
| int rc; |
| |
| if (remap_flags & ~(REMAP_FILE_DEDUP | REMAP_FILE_ADVISORY)) |
| return -EINVAL; |
| |
| cifs_dbg(FYI, "clone range\n"); |
| |
| xid = get_xid(); |
| |
| if (!src_file->private_data || !dst_file->private_data) { |
| rc = -EBADF; |
| cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n"); |
| goto out; |
| } |
| |
| smb_file_target = dst_file->private_data; |
| target_tcon = tlink_tcon(smb_file_target->tlink); |
| |
| /* |
| * Note: cifs case is easier than btrfs since server responsible for |
| * checks for proper open modes and file type and if it wants |
| * server could even support copy of range where source = target |
| */ |
| lock_two_nondirectories(target_inode, src_inode); |
| |
| if (len == 0) |
| len = src_inode->i_size - off; |
| |
| cifs_dbg(FYI, "about to flush pages\n"); |
| /* should we flush first and last page first */ |
| truncate_inode_pages_range(&target_inode->i_data, destoff, |
| PAGE_ALIGN(destoff + len)-1); |
| |
| if (target_tcon->ses->server->ops->duplicate_extents) |
| rc = target_tcon->ses->server->ops->duplicate_extents(xid, |
| smb_file_src, smb_file_target, off, len, destoff); |
| else |
| rc = -EOPNOTSUPP; |
| |
| /* force revalidate of size and timestamps of target file now |
| that target is updated on the server */ |
| CIFS_I(target_inode)->time = 0; |
| /* although unlocking in the reverse order from locking is not |
| strictly necessary here it is a little cleaner to be consistent */ |
| unlock_two_nondirectories(src_inode, target_inode); |
| out: |
| free_xid(xid); |
| return rc < 0 ? rc : len; |
| } |
| |
| ssize_t cifs_file_copychunk_range(unsigned int xid, |
| struct file *src_file, loff_t off, |
| struct file *dst_file, loff_t destoff, |
| size_t len, unsigned int flags) |
| { |
| struct inode *src_inode = file_inode(src_file); |
| struct inode *target_inode = file_inode(dst_file); |
| struct cifsFileInfo *smb_file_src; |
| struct cifsFileInfo *smb_file_target; |
| struct cifs_tcon *src_tcon; |
| struct cifs_tcon *target_tcon; |
| ssize_t rc; |
| |
| cifs_dbg(FYI, "copychunk range\n"); |
| |
| if (!src_file->private_data || !dst_file->private_data) { |
| rc = -EBADF; |
| cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n"); |
| goto out; |
| } |
| |
| rc = -EXDEV; |
| smb_file_target = dst_file->private_data; |
| smb_file_src = src_file->private_data; |
| src_tcon = tlink_tcon(smb_file_src->tlink); |
| target_tcon = tlink_tcon(smb_file_target->tlink); |
| |
| if (src_tcon->ses != target_tcon->ses) { |
| cifs_dbg(VFS, "source and target of copy not on same server\n"); |
| goto out; |
| } |
| |
| rc = -EOPNOTSUPP; |
| if (!target_tcon->ses->server->ops->copychunk_range) |
| goto out; |
| |
| /* |
| * Note: cifs case is easier than btrfs since server responsible for |
| * checks for proper open modes and file type and if it wants |
| * server could even support copy of range where source = target |
| */ |
| lock_two_nondirectories(target_inode, src_inode); |
| |
| cifs_dbg(FYI, "about to flush pages\n"); |
| /* should we flush first and last page first */ |
| truncate_inode_pages(&target_inode->i_data, 0); |
| |
| rc = file_modified(dst_file); |
| if (!rc) |
| rc = target_tcon->ses->server->ops->copychunk_range(xid, |
| smb_file_src, smb_file_target, off, len, destoff); |
| |
| file_accessed(src_file); |
| |
| /* force revalidate of size and timestamps of target file now |
| * that target is updated on the server |
| */ |
| CIFS_I(target_inode)->time = 0; |
| /* although unlocking in the reverse order from locking is not |
| * strictly necessary here it is a little cleaner to be consistent |
| */ |
| unlock_two_nondirectories(src_inode, target_inode); |
| |
| out: |
| return rc; |
| } |
| |
| /* |
| * Directory operations under CIFS/SMB2/SMB3 are synchronous, so fsync() |
| * is a dummy operation. |
| */ |
| static int cifs_dir_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
| { |
| cifs_dbg(FYI, "Sync directory - name: %pD datasync: 0x%x\n", |
| file, datasync); |
| |
| return 0; |
| } |
| |
| static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off, |
| struct file *dst_file, loff_t destoff, |
| size_t len, unsigned int flags) |
| { |
| unsigned int xid = get_xid(); |
| ssize_t rc; |
| struct cifsFileInfo *cfile = dst_file->private_data; |
| |
| if (cfile->swapfile) |
| return -EOPNOTSUPP; |
| |
| rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff, |
| len, flags); |
| free_xid(xid); |
| |
| if (rc == -EOPNOTSUPP || rc == -EXDEV) |
| rc = generic_copy_file_range(src_file, off, dst_file, |
| destoff, len, flags); |
| return rc; |
| } |
| |
| const struct file_operations cifs_file_ops = { |
| .read_iter = cifs_loose_read_iter, |
| .write_iter = cifs_file_write_iter, |
| .open = cifs_open, |
| .release = cifs_close, |
| .lock = cifs_lock, |
| .flock = cifs_flock, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| .splice_write = iter_file_splice_write, |
| .llseek = cifs_llseek, |
| .unlocked_ioctl = cifs_ioctl, |
| .copy_file_range = cifs_copy_file_range, |
| .remap_file_range = cifs_remap_file_range, |
| .setlease = cifs_setlease, |
| .fallocate = cifs_fallocate, |
| }; |
| |
| const struct file_operations cifs_file_strict_ops = { |
| .read_iter = cifs_strict_readv, |
| .write_iter = cifs_strict_writev, |
| .open = cifs_open, |
| .release = cifs_close, |
| .lock = cifs_lock, |
| .flock = cifs_flock, |
| .fsync = cifs_strict_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_strict_mmap, |
| .splice_read = generic_file_splice_read, |
| .splice_write = iter_file_splice_write, |
| .llseek = cifs_llseek, |
| .unlocked_ioctl = cifs_ioctl, |
| .copy_file_range = cifs_copy_file_range, |
| .remap_file_range = cifs_remap_file_range, |
| .setlease = cifs_setlease, |
| .fallocate = cifs_fallocate, |
| }; |
| |
| const struct file_operations cifs_file_direct_ops = { |
| .read_iter = cifs_direct_readv, |
| .write_iter = cifs_direct_writev, |
| .open = cifs_open, |
| .release = cifs_close, |
| .lock = cifs_lock, |
| .flock = cifs_flock, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| .splice_write = iter_file_splice_write, |
| .unlocked_ioctl = cifs_ioctl, |
| .copy_file_range = cifs_copy_file_range, |
| .remap_file_range = cifs_remap_file_range, |
| .llseek = cifs_llseek, |
| .setlease = cifs_setlease, |
| .fallocate = cifs_fallocate, |
| }; |
| |
| const struct file_operations cifs_file_nobrl_ops = { |
| .read_iter = cifs_loose_read_iter, |
| .write_iter = cifs_file_write_iter, |
| .open = cifs_open, |
| .release = cifs_close, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| .splice_write = iter_file_splice_write, |
| .llseek = cifs_llseek, |
| .unlocked_ioctl = cifs_ioctl, |
| .copy_file_range = cifs_copy_file_range, |
| .remap_file_range = cifs_remap_file_range, |
| .setlease = cifs_setlease, |
| .fallocate = cifs_fallocate, |
| }; |
| |
| const struct file_operations cifs_file_strict_nobrl_ops = { |
| .read_iter = cifs_strict_readv, |
| .write_iter = 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, |
| .splice_write = iter_file_splice_write, |
| .llseek = cifs_llseek, |
| .unlocked_ioctl = cifs_ioctl, |
| .copy_file_range = cifs_copy_file_range, |
| .remap_file_range = cifs_remap_file_range, |
| .setlease = cifs_setlease, |
| .fallocate = cifs_fallocate, |
| }; |
| |
| const struct file_operations cifs_file_direct_nobrl_ops = { |
| .read_iter = cifs_direct_readv, |
| .write_iter = cifs_direct_writev, |
| .open = cifs_open, |
| .release = cifs_close, |
| .fsync = cifs_fsync, |
| .flush = cifs_flush, |
| .mmap = cifs_file_mmap, |
| .splice_read = generic_file_splice_read, |
| .splice_write = iter_file_splice_write, |
| .unlocked_ioctl = cifs_ioctl, |
| .copy_file_range = cifs_copy_file_range, |
| .remap_file_range = cifs_remap_file_range, |
| .llseek = cifs_llseek, |
| .setlease = cifs_setlease, |
| .fallocate = cifs_fallocate, |
| }; |
| |
| const struct file_operations cifs_dir_ops = { |
| .iterate_shared = cifs_readdir, |
| .release = cifs_closedir, |
| .read = generic_read_dir, |
| .unlocked_ioctl = cifs_ioctl, |
| .copy_file_range = cifs_copy_file_range, |
| .remap_file_range = cifs_remap_file_range, |
| .llseek = generic_file_llseek, |
| .fsync = cifs_dir_fsync, |
| }; |
| |
| static void |
| cifs_init_once(void *inode) |
| { |
| struct cifsInodeInfo *cifsi = inode; |
| |
| inode_init_once(&cifsi->vfs_inode); |
| init_rwsem(&cifsi->lock_sem); |
| } |
| |
| static int __init |
| cifs_init_inodecache(void) |
| { |
| cifs_inode_cachep = kmem_cache_create("cifs_inode_cache", |
| sizeof(struct cifsInodeInfo), |
| 0, (SLAB_RECLAIM_ACCOUNT| |
| SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
| cifs_init_once); |
| if (cifs_inode_cachep == NULL) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static void |
| cifs_destroy_inodecache(void) |
| { |
| /* |
| * Make sure all delayed rcu free inodes are flushed before we |
| * destroy cache. |
| */ |
| rcu_barrier(); |
| kmem_cache_destroy(cifs_inode_cachep); |
| } |
| |
| static int |
| cifs_init_request_bufs(void) |
| { |
| /* |
| * SMB2 maximum header size is bigger than CIFS one - no problems to |
| * allocate some more bytes for CIFS. |
| */ |
| size_t max_hdr_size = MAX_SMB2_HDR_SIZE; |
| |
| 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*/ |
| } |
| /* |
| cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n", |
| CIFSMaxBufSize, CIFSMaxBufSize); |
| */ |
| cifs_req_cachep = kmem_cache_create_usercopy("cifs_request", |
| CIFSMaxBufSize + max_hdr_size, 0, |
| SLAB_HWCACHE_ALIGN, 0, |
| CIFSMaxBufSize + max_hdr_size, |
| 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; |
| cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n"); |
| } |
| |
| 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_usercopy("cifs_small_rq", |
| MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN, |
| 0, MAX_CIFS_SMALL_BUFFER_SIZE, 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; |
| cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n"); |
| } |
| |
| 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); |
| /* |
| * Initialize Global counters |
| */ |
| atomic_set(&sesInfoAllocCount, 0); |
| atomic_set(&tconInfoAllocCount, 0); |
| atomic_set(&tcpSesNextId, 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); |
| if (slow_rsp_threshold < 1) |
| cifs_dbg(FYI, "slow_response_threshold msgs disabled\n"); |
| else if (slow_rsp_threshold > 32767) |
| cifs_dbg(VFS, |
| "slow response threshold set higher than recommended (0 to 32767)\n"); |
| #endif /* CONFIG_CIFS_STATS2 */ |
| |
| atomic_set(&midCount, 0); |
| GlobalCurrentXid = 0; |
| GlobalTotalActiveXid = 0; |
| GlobalMaxActiveXid = 0; |
| spin_lock_init(&cifs_tcp_ses_lock); |
| spin_lock_init(&GlobalMid_Lock); |
| |
| cifs_lock_secret = get_random_u32(); |
| |
| if (cifs_max_pending < 2) { |
| cifs_max_pending = 2; |
| cifs_dbg(FYI, "cifs_max_pending set to min of 2\n"); |
| } else if (cifs_max_pending > CIFS_MAX_REQ) { |
| cifs_max_pending = CIFS_MAX_REQ; |
| cifs_dbg(FYI, "cifs_max_pending set to max of %u\n", |
| CIFS_MAX_REQ); |
| } |
| |
| cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); |
| if (!cifsiod_wq) { |
| rc = -ENOMEM; |
| goto out_clean_proc; |
| } |
| |
| /* |
| * Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3) |
| * so that we don't launch too many worker threads but |
| * Documentation/core-api/workqueue.rst recommends setting it to 0 |
| */ |
| |
| /* WQ_UNBOUND allows decrypt tasks to run on any CPU */ |
| decrypt_wq = alloc_workqueue("smb3decryptd", |
| WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); |
| if (!decrypt_wq) { |
| rc = -ENOMEM; |
| goto out_destroy_cifsiod_wq; |
| } |
| |
| fileinfo_put_wq = alloc_workqueue("cifsfileinfoput", |
| WQ_UNBOUND|WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); |
| if (!fileinfo_put_wq) { |
| rc = -ENOMEM; |
| goto out_destroy_decrypt_wq; |
| } |
| |
| cifsoplockd_wq = alloc_workqueue("cifsoplockd", |
| WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); |
| if (!cifsoplockd_wq) { |
| rc = -ENOMEM; |
| goto out_destroy_fileinfo_put_wq; |
| } |
| |
| deferredclose_wq = alloc_workqueue("deferredclose", |
| WQ_FREEZABLE|WQ_MEM_RECLAIM, 0); |
| if (!deferredclose_wq) { |
| rc = -ENOMEM; |
| goto out_destroy_cifsoplockd_wq; |
| } |
| |
| rc = cifs_fscache_register(); |
| if (rc) |
| goto out_destroy_deferredclose_wq; |
| |
| 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_DFS_UPCALL |
| rc = dfs_cache_init(); |
| if (rc) |
| goto out_destroy_request_bufs; |
| #endif /* CONFIG_CIFS_DFS_UPCALL */ |
| #ifdef CONFIG_CIFS_UPCALL |
| rc = init_cifs_spnego(); |
| if (rc) |
| goto out_destroy_dfs_cache; |
| #endif /* CONFIG_CIFS_UPCALL */ |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| rc = cifs_genl_init(); |
| if (rc) |
| goto out_register_key_type; |
| #endif /* CONFIG_CIFS_SWN_UPCALL */ |
| |
| rc = init_cifs_idmap(); |
| if (rc) |
| goto out_cifs_swn_init; |
| |
| rc = register_filesystem(&cifs_fs_type); |
| if (rc) |
| goto out_init_cifs_idmap; |
| |
| rc = register_filesystem(&smb3_fs_type); |
| if (rc) { |
| unregister_filesystem(&cifs_fs_type); |
| goto out_init_cifs_idmap; |
| } |
| |
| return 0; |
| |
| out_init_cifs_idmap: |
| exit_cifs_idmap(); |
| out_cifs_swn_init: |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| cifs_genl_exit(); |
| out_register_key_type: |
| #endif |
| #ifdef CONFIG_CIFS_UPCALL |
| exit_cifs_spnego(); |
| out_destroy_dfs_cache: |
| #endif |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| dfs_cache_destroy(); |
| 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_destroy_deferredclose_wq: |
| destroy_workqueue(deferredclose_wq); |
| out_destroy_cifsoplockd_wq: |
| destroy_workqueue(cifsoplockd_wq); |
| out_destroy_fileinfo_put_wq: |
| destroy_workqueue(fileinfo_put_wq); |
| out_destroy_decrypt_wq: |
| destroy_workqueue(decrypt_wq); |
| out_destroy_cifsiod_wq: |
| destroy_workqueue(cifsiod_wq); |
| out_clean_proc: |
| cifs_proc_clean(); |
| return rc; |
| } |
| |
| static void __exit |
| exit_cifs(void) |
| { |
| cifs_dbg(NOISY, "exit_smb3\n"); |
| unregister_filesystem(&cifs_fs_type); |
| unregister_filesystem(&smb3_fs_type); |
| cifs_dfs_release_automount_timer(); |
| exit_cifs_idmap(); |
| #ifdef CONFIG_CIFS_SWN_UPCALL |
| cifs_genl_exit(); |
| #endif |
| #ifdef CONFIG_CIFS_UPCALL |
| exit_cifs_spnego(); |
| #endif |
| #ifdef CONFIG_CIFS_DFS_UPCALL |
| dfs_cache_destroy(); |
| #endif |
| cifs_destroy_request_bufs(); |
| cifs_destroy_mids(); |
| cifs_destroy_inodecache(); |
| cifs_fscache_unregister(); |
| destroy_workqueue(deferredclose_wq); |
| destroy_workqueue(cifsoplockd_wq); |
| destroy_workqueue(decrypt_wq); |
| destroy_workqueue(fileinfo_put_wq); |
| destroy_workqueue(cifsiod_wq); |
| cifs_proc_clean(); |
| } |
| |
| MODULE_AUTHOR("Steve French"); |
| MODULE_LICENSE("GPL"); /* combination of LGPL + GPL source behaves as GPL */ |
| MODULE_DESCRIPTION |
| ("VFS to access SMB3 servers e.g. Samba, Macs, Azure and Windows (and " |
| "also older servers complying with the SNIA CIFS Specification)"); |
| MODULE_VERSION(CIFS_VERSION); |
| MODULE_SOFTDEP("ecb"); |
| MODULE_SOFTDEP("hmac"); |
| MODULE_SOFTDEP("md4"); |
| MODULE_SOFTDEP("md5"); |
| MODULE_SOFTDEP("nls"); |
| MODULE_SOFTDEP("aes"); |
| MODULE_SOFTDEP("cmac"); |
| MODULE_SOFTDEP("sha256"); |
| MODULE_SOFTDEP("sha512"); |
| MODULE_SOFTDEP("aead2"); |
| MODULE_SOFTDEP("ccm"); |
| MODULE_SOFTDEP("gcm"); |
| module_init(init_cifs) |
| module_exit(exit_cifs) |