diff options
Diffstat (limited to 'fs/smb/client/cifsfs.c')
| -rw-r--r-- | fs/smb/client/cifsfs.c | 1994 |
1 files changed, 1994 insertions, 0 deletions
diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c new file mode 100644 index 000000000..7286a56ae --- /dev/null +++ b/fs/smb/client/cifsfs.c @@ -0,0 +1,1994 @@ +// SPDX-License-Identifier: LGPL-2.1 +/* + * + * 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 <uapi/linux/magic.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" +#ifdef CONFIG_CIFS_DFS_UPCALL +#include "dfs_cache.h" +#endif +#ifdef CONFIG_CIFS_SWN_UPCALL +#include "netlink.h" +#endif +#include "fs_context.h" +#include "cached_dir.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 */ +bool enable_negotiate_signing; /* false by default */ +unsigned int global_secflags = CIFSSEC_DEF; +/* unsigned int ntlmv2_support = 0; */ +unsigned int sign_CIFS_PDUs = 1; + +/* + * Global transaction id (XID) information + */ +unsigned int GlobalCurrentXid; /* protected by GlobalMid_Sem */ +unsigned int GlobalTotalActiveXid; /* prot by GlobalMid_Sem */ +unsigned int GlobalMaxActiveXid; /* prot by GlobalMid_Sem */ +spinlock_t GlobalMid_Lock; /* protects above & list operations on midQ entries */ + +/* + * Global counters, updated atomically + */ +atomic_t sesInfoAllocCount; +atomic_t tconInfoAllocCount; +atomic_t tcpSesNextId; +atomic_t tcpSesAllocCount; +atomic_t tcpSesReconnectCount; +atomic_t tconInfoReconnectCount; + +atomic_t mid_count; +atomic_t buf_alloc_count; +atomic_t small_buf_alloc_count; +#ifdef CONFIG_CIFS_STATS2 +atomic_t total_buf_alloc_count; +atomic_t total_small_buf_alloc_count; +#endif/* STATS2 */ +struct list_head cifs_tcp_ses_list; +spinlock_t cifs_tcp_ses_lock; +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(enable_negotiate_signing, bool, 0644); +MODULE_PARM_DESC(enable_negotiate_signing, "Enable negotiating packet signing algorithm with server. 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_SUPER_MAGIC; + 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->rsize == 0) + cifs_sb->ctx->rsize = + tcon->ses->server->ops->negotiate_rsize(tcon, cifs_sb->ctx); + 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); + + /* + * We ned to release all dentries for the cached directories + * before we kill the sb. + */ + if (cifs_sb->root) { + close_all_cached_dirs(cifs_sb); + + /* finally release root dentry */ + dput(cifs_sb->root); + cifs_sb->root = NULL; + } + + 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 = alloc_inode_sb(sb, 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->netfs.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); + cifs_inode->symlink_target = NULL; + + /* + * Can not set i_flags here - they get immediately overwritten to zero + * by the VFS. + */ + /* cifs_inode->netfs.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->netfs.inode; +} + +static void +cifs_free_inode(struct inode *inode) +{ + struct cifsInodeInfo *cinode = CIFS_I(inode); + + if (S_ISLNK(inode->i_mode)) + kfree(cinode->symlink_target); + kmem_cache_free(cifs_inode_cachep, cinode); +} + +static void +cifs_evict_inode(struct inode *inode) +{ + truncate_inode_pages_final(&inode->i_data); + if (inode->i_state & I_PINNING_FSCACHE_WB) + cifs_fscache_unuse_inode_cookie(inode, true); + cifs_fscache_release_inode_cookie(inode); + clear_inode(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 NTLMv2: + seq_puts(s, "ntlmv2"); + 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 (cifs_sb->ctx->no_sparse) + seq_puts(s, ",nosparse"); + 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 the following if 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->ses->server->tcp_nodelay) + seq_puts(s, ",tcpnodelay"); + if (tcon->ses->server->noautotune) + seq_puts(s, ",noautotune"); + if (tcon->ses->server->noblocksnd) + seq_puts(s, ",noblocksend"); + + 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); + } + seq_printf(s, ",closetimeo=%lu", cifs_sb->ctx->closetimeo / 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); + spin_lock(&tcon->tc_lock); + if ((tcon->tc_count > 1) || (tcon->status == TID_EXITING)) { + /* we have other mounts to same share or we have + already tried to umount this and woken up + all waiting network requests, nothing to do */ + spin_unlock(&tcon->tc_lock); + spin_unlock(&cifs_tcp_ses_lock); + return; + } + /* + * can not set tcon->status to TID_EXITING yet since we don't know if umount -f will + * fail later (e.g. due to open files). TID_EXITING will be set just before tdis req sent + */ + spin_unlock(&tcon->tc_lock); + spin_unlock(&cifs_tcp_ses_lock); + + cifs_close_all_deferred_files(tcon); + /* 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; +} + +static int cifs_freeze(struct super_block *sb) +{ + struct cifs_sb_info *cifs_sb = CIFS_SB(sb); + struct cifs_tcon *tcon; + + if (cifs_sb == NULL) + return 0; + + tcon = cifs_sb_master_tcon(cifs_sb); + + cifs_close_all_deferred_files(tcon); + return 0; +} + +#ifdef CONFIG_CIFS_STATS2 +static int cifs_show_stats(struct seq_file *s, struct dentry *root) +{ + /* BB FIXME */ + return 0; +} +#endif + +static int cifs_write_inode(struct inode *inode, struct writeback_control *wbc) +{ + fscache_unpin_writeback(wbc, cifs_inode_cookie(inode)); + 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 = { + .statfs = cifs_statfs, + .alloc_inode = cifs_alloc_inode, + .write_inode = cifs_write_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, + .freeze_fs = cifs_freeze, +#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); + 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) +{ + struct cifs_mnt_data mnt_data; + struct cifs_sb_info *cifs_sb; + struct super_block *sb; + struct dentry *root; + int rc; + + /* + * 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(*cifs_sb), GFP_KERNEL); + if (!cifs_sb) + return ERR_PTR(-ENOMEM); + + 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)) { + cifs_umount(cifs_sb); + return ERR_CAST(sb); + } + + 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); + return root; +out: + 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_flags & IOCB_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"); + +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 char *cifs_get_link(struct dentry *dentry, struct inode *inode, + struct delayed_call *done) +{ + char *target_path; + + target_path = kmalloc(PATH_MAX, GFP_KERNEL); + if (!target_path) + return ERR_PTR(-ENOMEM); + + spin_lock(&inode->i_lock); + if (likely(CIFS_I(inode)->symlink_target)) { + strscpy(target_path, CIFS_I(inode)->symlink_target, PATH_MAX); + } else { + kfree(target_path); + target_path = ERR_PTR(-EOPNOTSUPP); + } + spin_unlock(&inode->i_lock); + + if (!IS_ERR(target_path)) + set_delayed_call(done, kfree_link, target_path); + + return target_path; +} + +const struct inode_operations cifs_symlink_inode_ops = { + .get_link = cifs_get_link, + .setattr = cifs_setattr, + .permission = cifs_permission, + .listxattr = cifs_listxattr, +}; + +/* + * Advance the EOF marker to after the source range. + */ +static int cifs_precopy_set_eof(struct inode *src_inode, struct cifsInodeInfo *src_cifsi, + struct cifs_tcon *src_tcon, + unsigned int xid, loff_t src_end) +{ + struct cifsFileInfo *writeable_srcfile; + int rc = -EINVAL; + + writeable_srcfile = find_writable_file(src_cifsi, FIND_WR_FSUID_ONLY); + if (writeable_srcfile) { + if (src_tcon->ses->server->ops->set_file_size) + rc = src_tcon->ses->server->ops->set_file_size( + xid, src_tcon, writeable_srcfile, + src_inode->i_size, true /* no need to set sparse */); + else + rc = -ENOSYS; + cifsFileInfo_put(writeable_srcfile); + cifs_dbg(FYI, "SetFSize for copychunk rc = %d\n", rc); + } + + if (rc < 0) + goto set_failed; + + netfs_resize_file(&src_cifsi->netfs, src_end); + fscache_resize_cookie(cifs_inode_cookie(src_inode), src_end); + return 0; + +set_failed: + return filemap_write_and_wait(src_inode->i_mapping); +} + +/* + * Flush out either the folio that overlaps the beginning of a range in which + * pos resides or the folio that overlaps the end of a range unless that folio + * is entirely within the range we're going to invalidate. We extend the flush + * bounds to encompass the folio. + */ +static int cifs_flush_folio(struct inode *inode, loff_t pos, loff_t *_fstart, loff_t *_fend, + bool first) +{ + struct folio *folio; + unsigned long long fpos, fend; + pgoff_t index = pos / PAGE_SIZE; + size_t size; + int rc = 0; + + folio = filemap_get_folio(inode->i_mapping, index); + if (!folio) + return 0; + + size = folio_size(folio); + fpos = folio_pos(folio); + fend = fpos + size - 1; + *_fstart = min_t(unsigned long long, *_fstart, fpos); + *_fend = max_t(unsigned long long, *_fend, fend); + if ((first && pos == fpos) || (!first && pos == fend)) + goto out; + + rc = filemap_write_and_wait_range(inode->i_mapping, fpos, fend); +out: + folio_put(folio); + return rc; +} + +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 cifsInodeInfo *src_cifsi = CIFS_I(src_inode); + struct cifsInodeInfo *target_cifsi = CIFS_I(target_inode); + struct cifsFileInfo *smb_file_src = src_file->private_data; + struct cifsFileInfo *smb_file_target = dst_file->private_data; + struct cifs_tcon *target_tcon, *src_tcon; + unsigned long long destend, fstart, fend, new_size; + unsigned int xid; + int rc; + + if (remap_flags & REMAP_FILE_DEDUP) + return -EOPNOTSUPP; + if (remap_flags & ~REMAP_FILE_ADVISORY) + return -EINVAL; + + cifs_dbg(FYI, "clone range\n"); + + xid = get_xid(); + + if (!smb_file_src || !smb_file_target) { + rc = -EBADF; + cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n"); + goto out; + } + + src_tcon = tlink_tcon(smb_file_src->tlink); + 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, "clone range\n"); + + /* Flush the source buffer */ + rc = filemap_write_and_wait_range(src_inode->i_mapping, off, + off + len - 1); + if (rc) + goto unlock; + + /* The server-side copy will fail if the source crosses the EOF marker. + * Advance the EOF marker after the flush above to the end of the range + * if it's short of that. + */ + if (src_cifsi->netfs.remote_i_size < off + len) { + rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len); + if (rc < 0) + goto unlock; + } + + new_size = destoff + len; + destend = destoff + len - 1; + + /* Flush the folios at either end of the destination range to prevent + * accidental loss of dirty data outside of the range. + */ + fstart = destoff; + fend = destend; + + rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true); + if (rc) + goto unlock; + rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false); + if (rc) + goto unlock; + + /* Discard all the folios that overlap the destination region. */ + cifs_dbg(FYI, "about to discard pages %llx-%llx\n", fstart, fend); + truncate_inode_pages_range(&target_inode->i_data, fstart, fend); + + fscache_invalidate(cifs_inode_cookie(target_inode), NULL, + i_size_read(target_inode), 0); + + rc = -EOPNOTSUPP; + 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); + if (rc == 0 && new_size > i_size_read(target_inode)) { + truncate_setsize(target_inode, new_size); + netfs_resize_file(&target_cifsi->netfs, new_size); + fscache_resize_cookie(cifs_inode_cookie(target_inode), + new_size); + } + } + + /* force revalidate of size and timestamps of target file now + that target is updated on the server */ + CIFS_I(target_inode)->time = 0; +unlock: + /* 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 cifsInodeInfo *src_cifsi = CIFS_I(src_inode); + struct cifsFileInfo *smb_file_src; + struct cifsFileInfo *smb_file_target; + struct cifs_tcon *src_tcon; + struct cifs_tcon *target_tcon; + unsigned long long destend, fstart, fend; + 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"); + + rc = filemap_write_and_wait_range(src_inode->i_mapping, off, + off + len - 1); + if (rc) + goto unlock; + + /* The server-side copy will fail if the source crosses the EOF marker. + * Advance the EOF marker after the flush above to the end of the range + * if it's short of that. + */ + if (src_cifsi->server_eof < off + len) { + rc = cifs_precopy_set_eof(src_inode, src_cifsi, src_tcon, xid, off + len); + if (rc < 0) + goto unlock; + } + + destend = destoff + len - 1; + + /* Flush the folios at either end of the destination range to prevent + * accidental loss of dirty data outside of the range. + */ + fstart = destoff; + fend = destend; + + rc = cifs_flush_folio(target_inode, destoff, &fstart, &fend, true); + if (rc) + goto unlock; + rc = cifs_flush_folio(target_inode, destend, &fstart, &fend, false); + if (rc) + goto unlock; + + /* Discard all the folios that overlap the destination region. */ + truncate_inode_pages_range(&target_inode->i_data, fstart, fend); + + 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); + if (rc > 0 && destoff + rc > i_size_read(target_inode)) + truncate_setsize(target_inode, destoff + rc); + } + + 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; + +unlock: + /* 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) { + rc = -EOPNOTSUPP; + free_xid(xid); + return rc; + } + + 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->netfs.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 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 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(&buf_alloc_count, 0); + atomic_set(&small_buf_alloc_count, 0); +#ifdef CONFIG_CIFS_STATS2 + atomic_set(&total_buf_alloc_count, 0); + atomic_set(&total_small_buf_alloc_count, 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(&mid_count, 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_init_inodecache(); + if (rc) + goto out_destroy_deferredclose_wq; + + rc = 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: + destroy_mids(); +out_destroy_inodecache: + cifs_destroy_inodecache(); +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(); + destroy_mids(); + cifs_destroy_inodecache(); + 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("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) |