| // SPDX-License-Identifier: LGPL-2.1 |
| /* |
| * |
| * vfs operations that deal with files |
| * |
| * Copyright (C) International Business Machines Corp., 2002,2010 |
| * Author(s): Steve French (sfrench@us.ibm.com) |
| * Jeremy Allison (jra@samba.org) |
| * |
| */ |
| #include <linux/fs.h> |
| #include <linux/filelock.h> |
| #include <linux/backing-dev.h> |
| #include <linux/stat.h> |
| #include <linux/fcntl.h> |
| #include <linux/pagemap.h> |
| #include <linux/pagevec.h> |
| #include <linux/writeback.h> |
| #include <linux/task_io_accounting_ops.h> |
| #include <linux/delay.h> |
| #include <linux/mount.h> |
| #include <linux/slab.h> |
| #include <linux/swap.h> |
| #include <linux/mm.h> |
| #include <asm/div64.h> |
| #include "cifsfs.h" |
| #include "cifspdu.h" |
| #include "cifsglob.h" |
| #include "cifsproto.h" |
| #include "smb2proto.h" |
| #include "cifs_unicode.h" |
| #include "cifs_debug.h" |
| #include "cifs_fs_sb.h" |
| #include "fscache.h" |
| #include "smbdirect.h" |
| #include "fs_context.h" |
| #include "cifs_ioctl.h" |
| #include "cached_dir.h" |
| #include <trace/events/netfs.h> |
| |
| static int cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush); |
| |
| /* |
| * Prepare a subrequest to upload to the server. We need to allocate credits |
| * so that we know the maximum amount of data that we can include in it. |
| */ |
| static void cifs_prepare_write(struct netfs_io_subrequest *subreq) |
| { |
| struct cifs_io_subrequest *wdata = |
| container_of(subreq, struct cifs_io_subrequest, subreq); |
| struct cifs_io_request *req = wdata->req; |
| struct TCP_Server_Info *server; |
| struct cifsFileInfo *open_file = req->cfile; |
| size_t wsize = req->rreq.wsize; |
| int rc; |
| |
| if (!wdata->have_xid) { |
| wdata->xid = get_xid(); |
| wdata->have_xid = true; |
| } |
| |
| server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses); |
| wdata->server = server; |
| |
| retry: |
| if (open_file->invalidHandle) { |
| rc = cifs_reopen_file(open_file, false); |
| if (rc < 0) { |
| if (rc == -EAGAIN) |
| goto retry; |
| subreq->error = rc; |
| return netfs_prepare_write_failed(subreq); |
| } |
| } |
| |
| rc = server->ops->wait_mtu_credits(server, wsize, &wdata->subreq.max_len, |
| &wdata->credits); |
| if (rc < 0) { |
| subreq->error = rc; |
| return netfs_prepare_write_failed(subreq); |
| } |
| |
| wdata->credits.rreq_debug_id = subreq->rreq->debug_id; |
| wdata->credits.rreq_debug_index = subreq->debug_index; |
| wdata->credits.in_flight_check = 1; |
| trace_smb3_rw_credits(wdata->rreq->debug_id, |
| wdata->subreq.debug_index, |
| wdata->credits.value, |
| server->credits, server->in_flight, |
| wdata->credits.value, |
| cifs_trace_rw_credits_write_prepare); |
| |
| #ifdef CONFIG_CIFS_SMB_DIRECT |
| if (server->smbd_conn) |
| subreq->max_nr_segs = server->smbd_conn->max_frmr_depth; |
| #endif |
| } |
| |
| /* |
| * Issue a subrequest to upload to the server. |
| */ |
| static void cifs_issue_write(struct netfs_io_subrequest *subreq) |
| { |
| struct cifs_io_subrequest *wdata = |
| container_of(subreq, struct cifs_io_subrequest, subreq); |
| struct cifs_sb_info *sbi = CIFS_SB(subreq->rreq->inode->i_sb); |
| int rc; |
| |
| if (cifs_forced_shutdown(sbi)) { |
| rc = -EIO; |
| goto fail; |
| } |
| |
| rc = adjust_credits(wdata->server, wdata, cifs_trace_rw_credits_issue_write_adjust); |
| if (rc) |
| goto fail; |
| |
| rc = -EAGAIN; |
| if (wdata->req->cfile->invalidHandle) |
| goto fail; |
| |
| wdata->server->ops->async_writev(wdata); |
| out: |
| return; |
| |
| fail: |
| if (rc == -EAGAIN) |
| trace_netfs_sreq(subreq, netfs_sreq_trace_retry); |
| else |
| trace_netfs_sreq(subreq, netfs_sreq_trace_fail); |
| add_credits_and_wake_if(wdata->server, &wdata->credits, 0); |
| cifs_write_subrequest_terminated(wdata, rc, false); |
| goto out; |
| } |
| |
| static void cifs_netfs_invalidate_cache(struct netfs_io_request *wreq) |
| { |
| cifs_invalidate_cache(wreq->inode, 0); |
| } |
| |
| /* |
| * Split the read up according to how many credits we can get for each piece. |
| * It's okay to sleep here if we need to wait for more credit to become |
| * available. |
| * |
| * We also choose the server and allocate an operation ID to be cleaned up |
| * later. |
| */ |
| static bool cifs_clamp_length(struct netfs_io_subrequest *subreq) |
| { |
| struct netfs_io_request *rreq = subreq->rreq; |
| struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq); |
| struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq); |
| struct TCP_Server_Info *server = req->server; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb); |
| size_t rsize = 0; |
| int rc; |
| |
| rdata->xid = get_xid(); |
| rdata->have_xid = true; |
| rdata->server = server; |
| |
| if (cifs_sb->ctx->rsize == 0) |
| cifs_sb->ctx->rsize = |
| server->ops->negotiate_rsize(tlink_tcon(req->cfile->tlink), |
| cifs_sb->ctx); |
| |
| |
| rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize, &rsize, |
| &rdata->credits); |
| if (rc) { |
| subreq->error = rc; |
| return false; |
| } |
| |
| rdata->credits.in_flight_check = 1; |
| rdata->credits.rreq_debug_id = rreq->debug_id; |
| rdata->credits.rreq_debug_index = subreq->debug_index; |
| |
| trace_smb3_rw_credits(rdata->rreq->debug_id, |
| rdata->subreq.debug_index, |
| rdata->credits.value, |
| server->credits, server->in_flight, 0, |
| cifs_trace_rw_credits_read_submit); |
| |
| subreq->len = min_t(size_t, subreq->len, rsize); |
| |
| #ifdef CONFIG_CIFS_SMB_DIRECT |
| if (server->smbd_conn) |
| subreq->max_nr_segs = server->smbd_conn->max_frmr_depth; |
| #endif |
| return true; |
| } |
| |
| /* |
| * Issue a read operation on behalf of the netfs helper functions. We're asked |
| * to make a read of a certain size at a point in the file. We are permitted |
| * to only read a portion of that, but as long as we read something, the netfs |
| * helper will call us again so that we can issue another read. |
| */ |
| static void cifs_req_issue_read(struct netfs_io_subrequest *subreq) |
| { |
| struct netfs_io_request *rreq = subreq->rreq; |
| struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq); |
| struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq); |
| int rc = 0; |
| |
| cifs_dbg(FYI, "%s: op=%08x[%x] mapping=%p len=%zu/%zu\n", |
| __func__, rreq->debug_id, subreq->debug_index, rreq->mapping, |
| subreq->transferred, subreq->len); |
| |
| if (req->cfile->invalidHandle) { |
| do { |
| rc = cifs_reopen_file(req->cfile, true); |
| } while (rc == -EAGAIN); |
| if (rc) |
| goto out; |
| } |
| |
| if (subreq->rreq->origin != NETFS_DIO_READ) |
| __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); |
| |
| rc = rdata->server->ops->async_readv(rdata); |
| out: |
| if (rc) |
| netfs_subreq_terminated(subreq, rc, false); |
| } |
| |
| /* |
| * Writeback calls this when it finds a folio that needs uploading. This isn't |
| * called if writeback only has copy-to-cache to deal with. |
| */ |
| static void cifs_begin_writeback(struct netfs_io_request *wreq) |
| { |
| struct cifs_io_request *req = container_of(wreq, struct cifs_io_request, rreq); |
| int ret; |
| |
| ret = cifs_get_writable_file(CIFS_I(wreq->inode), FIND_WR_ANY, &req->cfile); |
| if (ret) { |
| cifs_dbg(VFS, "No writable handle in writepages ret=%d\n", ret); |
| return; |
| } |
| |
| wreq->io_streams[0].avail = true; |
| } |
| |
| /* |
| * Initialise a request. |
| */ |
| static int cifs_init_request(struct netfs_io_request *rreq, struct file *file) |
| { |
| struct cifs_io_request *req = container_of(rreq, struct cifs_io_request, rreq); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb); |
| struct cifsFileInfo *open_file = NULL; |
| |
| rreq->rsize = cifs_sb->ctx->rsize; |
| rreq->wsize = cifs_sb->ctx->wsize; |
| req->pid = current->tgid; // Ummm... This may be a workqueue |
| |
| if (file) { |
| open_file = file->private_data; |
| rreq->netfs_priv = file->private_data; |
| req->cfile = cifsFileInfo_get(open_file); |
| req->server = cifs_pick_channel(tlink_tcon(req->cfile->tlink)->ses); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
| req->pid = req->cfile->pid; |
| } else if (rreq->origin != NETFS_WRITEBACK) { |
| WARN_ON_ONCE(1); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Completion of a request operation. |
| */ |
| static void cifs_rreq_done(struct netfs_io_request *rreq) |
| { |
| struct timespec64 atime, mtime; |
| struct inode *inode = rreq->inode; |
| |
| /* we do not want atime to be less than mtime, it broke some apps */ |
| atime = inode_set_atime_to_ts(inode, current_time(inode)); |
| mtime = inode_get_mtime(inode); |
| if (timespec64_compare(&atime, &mtime)) |
| inode_set_atime_to_ts(inode, inode_get_mtime(inode)); |
| } |
| |
| static void cifs_post_modify(struct inode *inode) |
| { |
| /* Indication to update ctime and mtime as close is deferred */ |
| set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags); |
| } |
| |
| static void cifs_free_request(struct netfs_io_request *rreq) |
| { |
| struct cifs_io_request *req = container_of(rreq, struct cifs_io_request, rreq); |
| |
| if (req->cfile) |
| cifsFileInfo_put(req->cfile); |
| } |
| |
| static void cifs_free_subrequest(struct netfs_io_subrequest *subreq) |
| { |
| struct cifs_io_subrequest *rdata = |
| container_of(subreq, struct cifs_io_subrequest, subreq); |
| int rc = subreq->error; |
| |
| if (rdata->subreq.source == NETFS_DOWNLOAD_FROM_SERVER) { |
| #ifdef CONFIG_CIFS_SMB_DIRECT |
| if (rdata->mr) { |
| smbd_deregister_mr(rdata->mr); |
| rdata->mr = NULL; |
| } |
| #endif |
| } |
| |
| if (rdata->credits.value != 0) { |
| trace_smb3_rw_credits(rdata->rreq->debug_id, |
| rdata->subreq.debug_index, |
| rdata->credits.value, |
| rdata->server ? rdata->server->credits : 0, |
| rdata->server ? rdata->server->in_flight : 0, |
| -rdata->credits.value, |
| cifs_trace_rw_credits_free_subreq); |
| if (rdata->server) |
| add_credits_and_wake_if(rdata->server, &rdata->credits, 0); |
| else |
| rdata->credits.value = 0; |
| } |
| |
| if (rdata->have_xid) |
| free_xid(rdata->xid); |
| } |
| |
| const struct netfs_request_ops cifs_req_ops = { |
| .request_pool = &cifs_io_request_pool, |
| .subrequest_pool = &cifs_io_subrequest_pool, |
| .init_request = cifs_init_request, |
| .free_request = cifs_free_request, |
| .free_subrequest = cifs_free_subrequest, |
| .clamp_length = cifs_clamp_length, |
| .issue_read = cifs_req_issue_read, |
| .done = cifs_rreq_done, |
| .post_modify = cifs_post_modify, |
| .begin_writeback = cifs_begin_writeback, |
| .prepare_write = cifs_prepare_write, |
| .issue_write = cifs_issue_write, |
| .invalidate_cache = cifs_netfs_invalidate_cache, |
| }; |
| |
| /* |
| * Mark as invalid, all open files on tree connections since they |
| * were closed when session to server was lost. |
| */ |
| void |
| cifs_mark_open_files_invalid(struct cifs_tcon *tcon) |
| { |
| struct cifsFileInfo *open_file = NULL; |
| struct list_head *tmp; |
| struct list_head *tmp1; |
| |
| /* only send once per connect */ |
| spin_lock(&tcon->tc_lock); |
| if (tcon->need_reconnect) |
| tcon->status = TID_NEED_RECON; |
| |
| if (tcon->status != TID_NEED_RECON) { |
| spin_unlock(&tcon->tc_lock); |
| return; |
| } |
| tcon->status = TID_IN_FILES_INVALIDATE; |
| spin_unlock(&tcon->tc_lock); |
| |
| /* list all files open on tree connection and mark them invalid */ |
| spin_lock(&tcon->open_file_lock); |
| list_for_each_safe(tmp, tmp1, &tcon->openFileList) { |
| open_file = list_entry(tmp, struct cifsFileInfo, tlist); |
| open_file->invalidHandle = true; |
| open_file->oplock_break_cancelled = true; |
| } |
| spin_unlock(&tcon->open_file_lock); |
| |
| invalidate_all_cached_dirs(tcon); |
| spin_lock(&tcon->tc_lock); |
| if (tcon->status == TID_IN_FILES_INVALIDATE) |
| tcon->status = TID_NEED_TCON; |
| spin_unlock(&tcon->tc_lock); |
| |
| /* |
| * BB Add call to invalidate_inodes(sb) for all superblocks mounted |
| * to this tcon. |
| */ |
| } |
| |
| static inline int cifs_convert_flags(unsigned int flags, int rdwr_for_fscache) |
| { |
| if ((flags & O_ACCMODE) == O_RDONLY) |
| return GENERIC_READ; |
| else if ((flags & O_ACCMODE) == O_WRONLY) |
| return rdwr_for_fscache == 1 ? (GENERIC_READ | GENERIC_WRITE) : GENERIC_WRITE; |
| else if ((flags & O_ACCMODE) == O_RDWR) { |
| /* GENERIC_ALL is too much permission to request |
| can cause unnecessary access denied on create */ |
| /* return GENERIC_ALL; */ |
| return (GENERIC_READ | GENERIC_WRITE); |
| } |
| |
| return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
| FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | |
| FILE_READ_DATA); |
| } |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| static u32 cifs_posix_convert_flags(unsigned int flags) |
| { |
| u32 posix_flags = 0; |
| |
| if ((flags & O_ACCMODE) == O_RDONLY) |
| posix_flags = SMB_O_RDONLY; |
| else if ((flags & O_ACCMODE) == O_WRONLY) |
| posix_flags = SMB_O_WRONLY; |
| else if ((flags & O_ACCMODE) == O_RDWR) |
| posix_flags = SMB_O_RDWR; |
| |
| if (flags & O_CREAT) { |
| posix_flags |= SMB_O_CREAT; |
| if (flags & O_EXCL) |
| posix_flags |= SMB_O_EXCL; |
| } else if (flags & O_EXCL) |
| cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n", |
| current->comm, current->tgid); |
| |
| if (flags & O_TRUNC) |
| posix_flags |= SMB_O_TRUNC; |
| /* be safe and imply O_SYNC for O_DSYNC */ |
| if (flags & O_DSYNC) |
| posix_flags |= SMB_O_SYNC; |
| if (flags & O_DIRECTORY) |
| posix_flags |= SMB_O_DIRECTORY; |
| if (flags & O_NOFOLLOW) |
| posix_flags |= SMB_O_NOFOLLOW; |
| if (flags & O_DIRECT) |
| posix_flags |= SMB_O_DIRECT; |
| |
| return posix_flags; |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| static inline int cifs_get_disposition(unsigned int flags) |
| { |
| if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) |
| return FILE_CREATE; |
| else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) |
| return FILE_OVERWRITE_IF; |
| else if ((flags & O_CREAT) == O_CREAT) |
| return FILE_OPEN_IF; |
| else if ((flags & O_TRUNC) == O_TRUNC) |
| return FILE_OVERWRITE; |
| else |
| return FILE_OPEN; |
| } |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| int cifs_posix_open(const char *full_path, struct inode **pinode, |
| struct super_block *sb, int mode, unsigned int f_flags, |
| __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
| { |
| int rc; |
| FILE_UNIX_BASIC_INFO *presp_data; |
| __u32 posix_flags = 0; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| struct cifs_fattr fattr; |
| struct tcon_link *tlink; |
| struct cifs_tcon *tcon; |
| |
| cifs_dbg(FYI, "posix open %s\n", full_path); |
| |
| presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); |
| if (presp_data == NULL) |
| return -ENOMEM; |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) { |
| rc = PTR_ERR(tlink); |
| goto posix_open_ret; |
| } |
| |
| tcon = tlink_tcon(tlink); |
| mode &= ~current_umask(); |
| |
| posix_flags = cifs_posix_convert_flags(f_flags); |
| rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, |
| poplock, full_path, cifs_sb->local_nls, |
| cifs_remap(cifs_sb)); |
| cifs_put_tlink(tlink); |
| |
| if (rc) |
| goto posix_open_ret; |
| |
| if (presp_data->Type == cpu_to_le32(-1)) |
| goto posix_open_ret; /* open ok, caller does qpathinfo */ |
| |
| if (!pinode) |
| goto posix_open_ret; /* caller does not need info */ |
| |
| cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); |
| |
| /* get new inode and set it up */ |
| if (*pinode == NULL) { |
| cifs_fill_uniqueid(sb, &fattr); |
| *pinode = cifs_iget(sb, &fattr); |
| if (!*pinode) { |
| rc = -ENOMEM; |
| goto posix_open_ret; |
| } |
| } else { |
| cifs_revalidate_mapping(*pinode); |
| rc = cifs_fattr_to_inode(*pinode, &fattr, false); |
| } |
| |
| posix_open_ret: |
| kfree(presp_data); |
| return rc; |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| static int cifs_nt_open(const char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, |
| struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
| struct cifs_fid *fid, unsigned int xid, struct cifs_open_info_data *buf) |
| { |
| int rc; |
| int desired_access; |
| int disposition; |
| int create_options = CREATE_NOT_DIR; |
| struct TCP_Server_Info *server = tcon->ses->server; |
| struct cifs_open_parms oparms; |
| int rdwr_for_fscache = 0; |
| |
| if (!server->ops->open) |
| return -ENOSYS; |
| |
| /* If we're caching, we need to be able to fill in around partial writes. */ |
| if (cifs_fscache_enabled(inode) && (f_flags & O_ACCMODE) == O_WRONLY) |
| rdwr_for_fscache = 1; |
| |
| desired_access = cifs_convert_flags(f_flags, rdwr_for_fscache); |
| |
| /********************************************************************* |
| * open flag mapping table: |
| * |
| * POSIX Flag CIFS Disposition |
| * ---------- ---------------- |
| * O_CREAT FILE_OPEN_IF |
| * O_CREAT | O_EXCL FILE_CREATE |
| * O_CREAT | O_TRUNC FILE_OVERWRITE_IF |
| * O_TRUNC FILE_OVERWRITE |
| * none of the above FILE_OPEN |
| * |
| * Note that there is not a direct match between disposition |
| * FILE_SUPERSEDE (ie create whether or not file exists although |
| * O_CREAT | O_TRUNC is similar but truncates the existing |
| * file rather than creating a new file as FILE_SUPERSEDE does |
| * (which uses the attributes / metadata passed in on open call) |
| *? |
| *? O_SYNC is a reasonable match to CIFS writethrough flag |
| *? and the read write flags match reasonably. O_LARGEFILE |
| *? is irrelevant because largefile support is always used |
| *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, |
| * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation |
| *********************************************************************/ |
| |
| disposition = cifs_get_disposition(f_flags); |
| |
| /* BB pass O_SYNC flag through on file attributes .. BB */ |
| |
| /* O_SYNC also has bit for O_DSYNC so following check picks up either */ |
| if (f_flags & O_SYNC) |
| create_options |= CREATE_WRITE_THROUGH; |
| |
| if (f_flags & O_DIRECT) |
| create_options |= CREATE_NO_BUFFER; |
| |
| retry_open: |
| oparms = (struct cifs_open_parms) { |
| .tcon = tcon, |
| .cifs_sb = cifs_sb, |
| .desired_access = desired_access, |
| .create_options = cifs_create_options(cifs_sb, create_options), |
| .disposition = disposition, |
| .path = full_path, |
| .fid = fid, |
| }; |
| |
| rc = server->ops->open(xid, &oparms, oplock, buf); |
| if (rc) { |
| if (rc == -EACCES && rdwr_for_fscache == 1) { |
| desired_access = cifs_convert_flags(f_flags, 0); |
| rdwr_for_fscache = 2; |
| goto retry_open; |
| } |
| return rc; |
| } |
| if (rdwr_for_fscache == 2) |
| cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); |
| |
| /* TODO: Add support for calling posix query info but with passing in fid */ |
| if (tcon->unix_ext) |
| rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, |
| xid); |
| else |
| rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, |
| xid, fid); |
| |
| if (rc) { |
| server->ops->close(xid, tcon, fid); |
| if (rc == -ESTALE) |
| rc = -EOPENSTALE; |
| } |
| |
| return rc; |
| } |
| |
| static bool |
| cifs_has_mand_locks(struct cifsInodeInfo *cinode) |
| { |
| struct cifs_fid_locks *cur; |
| bool has_locks = false; |
| |
| down_read(&cinode->lock_sem); |
| list_for_each_entry(cur, &cinode->llist, llist) { |
| if (!list_empty(&cur->locks)) { |
| has_locks = true; |
| break; |
| } |
| } |
| up_read(&cinode->lock_sem); |
| return has_locks; |
| } |
| |
| void |
| cifs_down_write(struct rw_semaphore *sem) |
| { |
| while (!down_write_trylock(sem)) |
| msleep(10); |
| } |
| |
| static void cifsFileInfo_put_work(struct work_struct *work); |
| void serverclose_work(struct work_struct *work); |
| |
| struct cifsFileInfo *cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
| struct tcon_link *tlink, __u32 oplock, |
| const char *symlink_target) |
| { |
| struct dentry *dentry = file_dentry(file); |
| struct inode *inode = d_inode(dentry); |
| struct cifsInodeInfo *cinode = CIFS_I(inode); |
| struct cifsFileInfo *cfile; |
| struct cifs_fid_locks *fdlocks; |
| struct cifs_tcon *tcon = tlink_tcon(tlink); |
| struct TCP_Server_Info *server = tcon->ses->server; |
| |
| cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); |
| if (cfile == NULL) |
| return cfile; |
| |
| fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
| if (!fdlocks) { |
| kfree(cfile); |
| return NULL; |
| } |
| |
| if (symlink_target) { |
| cfile->symlink_target = kstrdup(symlink_target, GFP_KERNEL); |
| if (!cfile->symlink_target) { |
| kfree(fdlocks); |
| kfree(cfile); |
| return NULL; |
| } |
| } |
| |
| INIT_LIST_HEAD(&fdlocks->locks); |
| fdlocks->cfile = cfile; |
| cfile->llist = fdlocks; |
| |
| cfile->count = 1; |
| cfile->pid = current->tgid; |
| cfile->uid = current_fsuid(); |
| cfile->dentry = dget(dentry); |
| cfile->f_flags = file->f_flags; |
| cfile->invalidHandle = false; |
| cfile->deferred_close_scheduled = false; |
| cfile->tlink = cifs_get_tlink(tlink); |
| INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
| INIT_WORK(&cfile->put, cifsFileInfo_put_work); |
| INIT_WORK(&cfile->serverclose, serverclose_work); |
| INIT_DELAYED_WORK(&cfile->deferred, smb2_deferred_work_close); |
| mutex_init(&cfile->fh_mutex); |
| spin_lock_init(&cfile->file_info_lock); |
| |
| cifs_sb_active(inode->i_sb); |
| |
| /* |
| * If the server returned a read oplock and we have mandatory brlocks, |
| * set oplock level to None. |
| */ |
| if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { |
| cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
| oplock = 0; |
| } |
| |
| cifs_down_write(&cinode->lock_sem); |
| list_add(&fdlocks->llist, &cinode->llist); |
| up_write(&cinode->lock_sem); |
| |
| spin_lock(&tcon->open_file_lock); |
| if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
| oplock = fid->pending_open->oplock; |
| list_del(&fid->pending_open->olist); |
| |
| fid->purge_cache = false; |
| server->ops->set_fid(cfile, fid, oplock); |
| |
| list_add(&cfile->tlist, &tcon->openFileList); |
| atomic_inc(&tcon->num_local_opens); |
| |
| /* if readable file instance put first in list*/ |
| spin_lock(&cinode->open_file_lock); |
| if (file->f_mode & FMODE_READ) |
| list_add(&cfile->flist, &cinode->openFileList); |
| else |
| list_add_tail(&cfile->flist, &cinode->openFileList); |
| spin_unlock(&cinode->open_file_lock); |
| spin_unlock(&tcon->open_file_lock); |
| |
| if (fid->purge_cache) |
| cifs_zap_mapping(inode); |
| |
| file->private_data = cfile; |
| return cfile; |
| } |
| |
| struct cifsFileInfo * |
| cifsFileInfo_get(struct cifsFileInfo *cifs_file) |
| { |
| spin_lock(&cifs_file->file_info_lock); |
| cifsFileInfo_get_locked(cifs_file); |
| spin_unlock(&cifs_file->file_info_lock); |
| return cifs_file; |
| } |
| |
| static void cifsFileInfo_put_final(struct cifsFileInfo *cifs_file) |
| { |
| struct inode *inode = d_inode(cifs_file->dentry); |
| struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| struct cifsLockInfo *li, *tmp; |
| struct super_block *sb = inode->i_sb; |
| |
| /* |
| * Delete any outstanding lock records. We'll lose them when the file |
| * is closed anyway. |
| */ |
| cifs_down_write(&cifsi->lock_sem); |
| list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { |
| list_del(&li->llist); |
| cifs_del_lock_waiters(li); |
| kfree(li); |
| } |
| list_del(&cifs_file->llist->llist); |
| kfree(cifs_file->llist); |
| up_write(&cifsi->lock_sem); |
| |
| cifs_put_tlink(cifs_file->tlink); |
| dput(cifs_file->dentry); |
| cifs_sb_deactive(sb); |
| kfree(cifs_file->symlink_target); |
| kfree(cifs_file); |
| } |
| |
| static void cifsFileInfo_put_work(struct work_struct *work) |
| { |
| struct cifsFileInfo *cifs_file = container_of(work, |
| struct cifsFileInfo, put); |
| |
| cifsFileInfo_put_final(cifs_file); |
| } |
| |
| void serverclose_work(struct work_struct *work) |
| { |
| struct cifsFileInfo *cifs_file = container_of(work, |
| struct cifsFileInfo, serverclose); |
| |
| struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
| |
| struct TCP_Server_Info *server = tcon->ses->server; |
| int rc = 0; |
| int retries = 0; |
| int MAX_RETRIES = 4; |
| |
| do { |
| if (server->ops->close_getattr) |
| rc = server->ops->close_getattr(0, tcon, cifs_file); |
| else if (server->ops->close) |
| rc = server->ops->close(0, tcon, &cifs_file->fid); |
| |
| if (rc == -EBUSY || rc == -EAGAIN) { |
| retries++; |
| msleep(250); |
| } |
| } while ((rc == -EBUSY || rc == -EAGAIN) && (retries < MAX_RETRIES) |
| ); |
| |
| if (retries == MAX_RETRIES) |
| pr_warn("Serverclose failed %d times, giving up\n", MAX_RETRIES); |
| |
| if (cifs_file->offload) |
| queue_work(fileinfo_put_wq, &cifs_file->put); |
| else |
| cifsFileInfo_put_final(cifs_file); |
| } |
| |
| /** |
| * cifsFileInfo_put - release a reference of file priv data |
| * |
| * Always potentially wait for oplock handler. See _cifsFileInfo_put(). |
| * |
| * @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file |
| */ |
| void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
| { |
| _cifsFileInfo_put(cifs_file, true, true); |
| } |
| |
| /** |
| * _cifsFileInfo_put - release a reference of file priv data |
| * |
| * This may involve closing the filehandle @cifs_file out on the |
| * server. Must be called without holding tcon->open_file_lock, |
| * cinode->open_file_lock and cifs_file->file_info_lock. |
| * |
| * If @wait_for_oplock_handler is true and we are releasing the last |
| * reference, wait for any running oplock break handler of the file |
| * and cancel any pending one. |
| * |
| * @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file |
| * @wait_oplock_handler: must be false if called from oplock_break_handler |
| * @offload: not offloaded on close and oplock breaks |
| * |
| */ |
| void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, |
| bool wait_oplock_handler, bool offload) |
| { |
| struct inode *inode = d_inode(cifs_file->dentry); |
| struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
| struct TCP_Server_Info *server = tcon->ses->server; |
| struct cifsInodeInfo *cifsi = CIFS_I(inode); |
| struct super_block *sb = inode->i_sb; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(sb); |
| struct cifs_fid fid = {}; |
| struct cifs_pending_open open; |
| bool oplock_break_cancelled; |
| bool serverclose_offloaded = false; |
| |
| spin_lock(&tcon->open_file_lock); |
| spin_lock(&cifsi->open_file_lock); |
| spin_lock(&cifs_file->file_info_lock); |
| |
| cifs_file->offload = offload; |
| if (--cifs_file->count > 0) { |
| spin_unlock(&cifs_file->file_info_lock); |
| spin_unlock(&cifsi->open_file_lock); |
| spin_unlock(&tcon->open_file_lock); |
| return; |
| } |
| spin_unlock(&cifs_file->file_info_lock); |
| |
| if (server->ops->get_lease_key) |
| server->ops->get_lease_key(inode, &fid); |
| |
| /* store open in pending opens to make sure we don't miss lease break */ |
| cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); |
| |
| /* remove it from the lists */ |
| list_del(&cifs_file->flist); |
| list_del(&cifs_file->tlist); |
| atomic_dec(&tcon->num_local_opens); |
| |
| if (list_empty(&cifsi->openFileList)) { |
| cifs_dbg(FYI, "closing last open instance for inode %p\n", |
| d_inode(cifs_file->dentry)); |
| /* |
| * In strict cache mode we need invalidate mapping on the last |
| * close because it may cause a error when we open this file |
| * again and get at least level II oplock. |
| */ |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
| set_bit(CIFS_INO_INVALID_MAPPING, &cifsi->flags); |
| cifs_set_oplock_level(cifsi, 0); |
| } |
| |
| spin_unlock(&cifsi->open_file_lock); |
| spin_unlock(&tcon->open_file_lock); |
| |
| oplock_break_cancelled = wait_oplock_handler ? |
| cancel_work_sync(&cifs_file->oplock_break) : false; |
| |
| if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
| struct TCP_Server_Info *server = tcon->ses->server; |
| unsigned int xid; |
| int rc = 0; |
| |
| xid = get_xid(); |
| if (server->ops->close_getattr) |
| rc = server->ops->close_getattr(xid, tcon, cifs_file); |
| else if (server->ops->close) |
| rc = server->ops->close(xid, tcon, &cifs_file->fid); |
| _free_xid(xid); |
| |
| if (rc == -EBUSY || rc == -EAGAIN) { |
| // Server close failed, hence offloading it as an async op |
| queue_work(serverclose_wq, &cifs_file->serverclose); |
| serverclose_offloaded = true; |
| } |
| } |
| |
| if (oplock_break_cancelled) |
| cifs_done_oplock_break(cifsi); |
| |
| cifs_del_pending_open(&open); |
| |
| // if serverclose has been offloaded to wq (on failure), it will |
| // handle offloading put as well. If serverclose not offloaded, |
| // we need to handle offloading put here. |
| if (!serverclose_offloaded) { |
| if (offload) |
| queue_work(fileinfo_put_wq, &cifs_file->put); |
| else |
| cifsFileInfo_put_final(cifs_file); |
| } |
| } |
| |
| int cifs_open(struct inode *inode, struct file *file) |
| |
| { |
| int rc = -EACCES; |
| unsigned int xid; |
| __u32 oplock; |
| struct cifs_sb_info *cifs_sb; |
| struct TCP_Server_Info *server; |
| struct cifs_tcon *tcon; |
| struct tcon_link *tlink; |
| struct cifsFileInfo *cfile = NULL; |
| void *page; |
| const char *full_path; |
| bool posix_open_ok = false; |
| struct cifs_fid fid = {}; |
| struct cifs_pending_open open; |
| struct cifs_open_info_data data = {}; |
| |
| xid = get_xid(); |
| |
| cifs_sb = CIFS_SB(inode->i_sb); |
| if (unlikely(cifs_forced_shutdown(cifs_sb))) { |
| free_xid(xid); |
| return -EIO; |
| } |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) { |
| free_xid(xid); |
| return PTR_ERR(tlink); |
| } |
| tcon = tlink_tcon(tlink); |
| server = tcon->ses->server; |
| |
| page = alloc_dentry_path(); |
| full_path = build_path_from_dentry(file_dentry(file), page); |
| if (IS_ERR(full_path)) { |
| rc = PTR_ERR(full_path); |
| goto out; |
| } |
| |
| cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n", |
| inode, file->f_flags, full_path); |
| |
| if (file->f_flags & O_DIRECT && |
| cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) |
| file->f_op = &cifs_file_direct_nobrl_ops; |
| else |
| file->f_op = &cifs_file_direct_ops; |
| } |
| |
| /* Get the cached handle as SMB2 close is deferred */ |
| rc = cifs_get_readable_path(tcon, full_path, &cfile); |
| if (rc == 0) { |
| if (file->f_flags == cfile->f_flags) { |
| file->private_data = cfile; |
| spin_lock(&CIFS_I(inode)->deferred_lock); |
| cifs_del_deferred_close(cfile); |
| spin_unlock(&CIFS_I(inode)->deferred_lock); |
| goto use_cache; |
| } else { |
| _cifsFileInfo_put(cfile, true, false); |
| } |
| } |
| |
| if (server->oplocks) |
| oplock = REQ_OPLOCK; |
| else |
| oplock = 0; |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| if (!tcon->broken_posix_open && tcon->unix_ext && |
| cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
| /* can not refresh inode info since size could be stale */ |
| rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
| cifs_sb->ctx->file_mode /* ignored */, |
| file->f_flags, &oplock, &fid.netfid, xid); |
| if (rc == 0) { |
| cifs_dbg(FYI, "posix open succeeded\n"); |
| posix_open_ok = true; |
| } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
| if (tcon->ses->serverNOS) |
| cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n", |
| tcon->ses->ip_addr, |
| tcon->ses->serverNOS); |
| tcon->broken_posix_open = true; |
| } else if ((rc != -EIO) && (rc != -EREMOTE) && |
| (rc != -EOPNOTSUPP)) /* path not found or net err */ |
| goto out; |
| /* |
| * Else fallthrough to retry open the old way on network i/o |
| * or DFS errors. |
| */ |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| if (server->ops->get_lease_key) |
| server->ops->get_lease_key(inode, &fid); |
| |
| cifs_add_pending_open(&fid, tlink, &open); |
| |
| if (!posix_open_ok) { |
| if (server->ops->get_lease_key) |
| server->ops->get_lease_key(inode, &fid); |
| |
| rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, file->f_flags, &oplock, &fid, |
| xid, &data); |
| if (rc) { |
| cifs_del_pending_open(&open); |
| goto out; |
| } |
| } |
| |
| cfile = cifs_new_fileinfo(&fid, file, tlink, oplock, data.symlink_target); |
| if (cfile == NULL) { |
| if (server->ops->close) |
| server->ops->close(xid, tcon, &fid); |
| cifs_del_pending_open(&open); |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
| /* |
| * Time to set mode which we can not set earlier due to |
| * problems creating new read-only files. |
| */ |
| struct cifs_unix_set_info_args args = { |
| .mode = inode->i_mode, |
| .uid = INVALID_UID, /* no change */ |
| .gid = INVALID_GID, /* no change */ |
| .ctime = NO_CHANGE_64, |
| .atime = NO_CHANGE_64, |
| .mtime = NO_CHANGE_64, |
| .device = 0, |
| }; |
| CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
| cfile->pid); |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| use_cache: |
| fscache_use_cookie(cifs_inode_cookie(file_inode(file)), |
| file->f_mode & FMODE_WRITE); |
| if (!(file->f_flags & O_DIRECT)) |
| goto out; |
| if ((file->f_flags & (O_ACCMODE | O_APPEND)) == O_RDONLY) |
| goto out; |
| cifs_invalidate_cache(file_inode(file), FSCACHE_INVAL_DIO_WRITE); |
| |
| out: |
| free_dentry_path(page); |
| free_xid(xid); |
| cifs_put_tlink(tlink); |
| cifs_free_open_info(&data); |
| return rc; |
| } |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| /* |
| * Try to reacquire byte range locks that were released when session |
| * to server was lost. |
| */ |
| static int |
| cifs_relock_file(struct cifsFileInfo *cfile) |
| { |
| struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| int rc = 0; |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| down_read_nested(&cinode->lock_sem, SINGLE_DEPTH_NESTING); |
| if (cinode->can_cache_brlcks) { |
| /* can cache locks - no need to relock */ |
| up_read(&cinode->lock_sem); |
| return rc; |
| } |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| if (cap_unix(tcon->ses) && |
| (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
| rc = cifs_push_posix_locks(cfile); |
| else |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| rc = tcon->ses->server->ops->push_mand_locks(cfile); |
| |
| up_read(&cinode->lock_sem); |
| return rc; |
| } |
| |
| static int |
| cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) |
| { |
| int rc = -EACCES; |
| unsigned int xid; |
| __u32 oplock; |
| struct cifs_sb_info *cifs_sb; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| struct cifsInodeInfo *cinode; |
| struct inode *inode; |
| void *page; |
| const char *full_path; |
| int desired_access; |
| int disposition = FILE_OPEN; |
| int create_options = CREATE_NOT_DIR; |
| struct cifs_open_parms oparms; |
| int rdwr_for_fscache = 0; |
| |
| xid = get_xid(); |
| mutex_lock(&cfile->fh_mutex); |
| if (!cfile->invalidHandle) { |
| mutex_unlock(&cfile->fh_mutex); |
| free_xid(xid); |
| return 0; |
| } |
| |
| inode = d_inode(cfile->dentry); |
| cifs_sb = CIFS_SB(inode->i_sb); |
| tcon = tlink_tcon(cfile->tlink); |
| server = tcon->ses->server; |
| |
| /* |
| * Can not grab rename sem here because various ops, including those |
| * that already have the rename sem can end up causing writepage to get |
| * called and if the server was down that means we end up here, and we |
| * can never tell if the caller already has the rename_sem. |
| */ |
| page = alloc_dentry_path(); |
| full_path = build_path_from_dentry(cfile->dentry, page); |
| if (IS_ERR(full_path)) { |
| mutex_unlock(&cfile->fh_mutex); |
| free_dentry_path(page); |
| free_xid(xid); |
| return PTR_ERR(full_path); |
| } |
| |
| cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", |
| inode, cfile->f_flags, full_path); |
| |
| if (tcon->ses->server->oplocks) |
| oplock = REQ_OPLOCK; |
| else |
| oplock = 0; |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| if (tcon->unix_ext && cap_unix(tcon->ses) && |
| (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
| le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
| /* |
| * O_CREAT, O_EXCL and O_TRUNC already had their effect on the |
| * original open. Must mask them off for a reopen. |
| */ |
| unsigned int oflags = cfile->f_flags & |
| ~(O_CREAT | O_EXCL | O_TRUNC); |
| |
| rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
| cifs_sb->ctx->file_mode /* ignored */, |
| oflags, &oplock, &cfile->fid.netfid, xid); |
| if (rc == 0) { |
| cifs_dbg(FYI, "posix reopen succeeded\n"); |
| oparms.reconnect = true; |
| goto reopen_success; |
| } |
| /* |
| * fallthrough to retry open the old way on errors, especially |
| * in the reconnect path it is important to retry hard |
| */ |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| /* If we're caching, we need to be able to fill in around partial writes. */ |
| if (cifs_fscache_enabled(inode) && (cfile->f_flags & O_ACCMODE) == O_WRONLY) |
| rdwr_for_fscache = 1; |
| |
| desired_access = cifs_convert_flags(cfile->f_flags, rdwr_for_fscache); |
| |
| /* O_SYNC also has bit for O_DSYNC so following check picks up either */ |
| if (cfile->f_flags & O_SYNC) |
| create_options |= CREATE_WRITE_THROUGH; |
| |
| if (cfile->f_flags & O_DIRECT) |
| create_options |= CREATE_NO_BUFFER; |
| |
| if (server->ops->get_lease_key) |
| server->ops->get_lease_key(inode, &cfile->fid); |
| |
| retry_open: |
| oparms = (struct cifs_open_parms) { |
| .tcon = tcon, |
| .cifs_sb = cifs_sb, |
| .desired_access = desired_access, |
| .create_options = cifs_create_options(cifs_sb, create_options), |
| .disposition = disposition, |
| .path = full_path, |
| .fid = &cfile->fid, |
| .reconnect = true, |
| }; |
| |
| /* |
| * Can not refresh inode by passing in file_info buf to be returned by |
| * ops->open and then calling get_inode_info with returned buf since |
| * file might have write behind data that needs to be flushed and server |
| * version of file size can be stale. If we knew for sure that inode was |
| * not dirty locally we could do this. |
| */ |
| rc = server->ops->open(xid, &oparms, &oplock, NULL); |
| if (rc == -ENOENT && oparms.reconnect == false) { |
| /* durable handle timeout is expired - open the file again */ |
| rc = server->ops->open(xid, &oparms, &oplock, NULL); |
| /* indicate that we need to relock the file */ |
| oparms.reconnect = true; |
| } |
| if (rc == -EACCES && rdwr_for_fscache == 1) { |
| desired_access = cifs_convert_flags(cfile->f_flags, 0); |
| rdwr_for_fscache = 2; |
| goto retry_open; |
| } |
| |
| if (rc) { |
| mutex_unlock(&cfile->fh_mutex); |
| cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); |
| cifs_dbg(FYI, "oplock: %d\n", oplock); |
| goto reopen_error_exit; |
| } |
| |
| if (rdwr_for_fscache == 2) |
| cifs_invalidate_cache(inode, FSCACHE_INVAL_DIO_WRITE); |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| reopen_success: |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| cfile->invalidHandle = false; |
| mutex_unlock(&cfile->fh_mutex); |
| cinode = CIFS_I(inode); |
| |
| if (can_flush) { |
| rc = filemap_write_and_wait(inode->i_mapping); |
| if (!is_interrupt_error(rc)) |
| mapping_set_error(inode->i_mapping, rc); |
| |
| if (tcon->posix_extensions) { |
| rc = smb311_posix_get_inode_info(&inode, full_path, |
| NULL, inode->i_sb, xid); |
| } else if (tcon->unix_ext) { |
| rc = cifs_get_inode_info_unix(&inode, full_path, |
| inode->i_sb, xid); |
| } else { |
| rc = cifs_get_inode_info(&inode, full_path, NULL, |
| inode->i_sb, xid, NULL); |
| } |
| } |
| /* |
| * Else we are writing out data to server already and could deadlock if |
| * we tried to flush data, and since we do not know if we have data that |
| * would invalidate the current end of file on the server we can not go |
| * to the server to get the new inode info. |
| */ |
| |
| /* |
| * If the server returned a read oplock and we have mandatory brlocks, |
| * set oplock level to None. |
| */ |
| if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { |
| cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
| oplock = 0; |
| } |
| |
| server->ops->set_fid(cfile, &cfile->fid, oplock); |
| if (oparms.reconnect) |
| cifs_relock_file(cfile); |
| |
| reopen_error_exit: |
| free_dentry_path(page); |
| free_xid(xid); |
| return rc; |
| } |
| |
| void smb2_deferred_work_close(struct work_struct *work) |
| { |
| struct cifsFileInfo *cfile = container_of(work, |
| struct cifsFileInfo, deferred.work); |
| |
| spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); |
| cifs_del_deferred_close(cfile); |
| cfile->deferred_close_scheduled = false; |
| spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); |
| _cifsFileInfo_put(cfile, true, false); |
| } |
| |
| static bool |
| smb2_can_defer_close(struct inode *inode, struct cifs_deferred_close *dclose) |
| { |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifsInodeInfo *cinode = CIFS_I(inode); |
| |
| return (cifs_sb->ctx->closetimeo && cinode->lease_granted && dclose && |
| (cinode->oplock == CIFS_CACHE_RHW_FLG || |
| cinode->oplock == CIFS_CACHE_RH_FLG) && |
| !test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags)); |
| |
| } |
| |
| int cifs_close(struct inode *inode, struct file *file) |
| { |
| struct cifsFileInfo *cfile; |
| struct cifsInodeInfo *cinode = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifs_deferred_close *dclose; |
| |
| cifs_fscache_unuse_inode_cookie(inode, file->f_mode & FMODE_WRITE); |
| |
| if (file->private_data != NULL) { |
| cfile = file->private_data; |
| file->private_data = NULL; |
| dclose = kmalloc(sizeof(struct cifs_deferred_close), GFP_KERNEL); |
| if ((cfile->status_file_deleted == false) && |
| (smb2_can_defer_close(inode, dclose))) { |
| if (test_and_clear_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) { |
| inode_set_mtime_to_ts(inode, |
| inode_set_ctime_current(inode)); |
| } |
| spin_lock(&cinode->deferred_lock); |
| cifs_add_deferred_close(cfile, dclose); |
| if (cfile->deferred_close_scheduled && |
| delayed_work_pending(&cfile->deferred)) { |
| /* |
| * If there is no pending work, mod_delayed_work queues new work. |
| * So, Increase the ref count to avoid use-after-free. |
| */ |
| if (!mod_delayed_work(deferredclose_wq, |
| &cfile->deferred, cifs_sb->ctx->closetimeo)) |
| cifsFileInfo_get(cfile); |
| } else { |
| /* Deferred close for files */ |
| queue_delayed_work(deferredclose_wq, |
| &cfile->deferred, cifs_sb->ctx->closetimeo); |
| cfile->deferred_close_scheduled = true; |
| spin_unlock(&cinode->deferred_lock); |
| return 0; |
| } |
| spin_unlock(&cinode->deferred_lock); |
| _cifsFileInfo_put(cfile, true, false); |
| } else { |
| _cifsFileInfo_put(cfile, true, false); |
| kfree(dclose); |
| } |
| } |
| |
| /* return code from the ->release op is always ignored */ |
| return 0; |
| } |
| |
| void |
| cifs_reopen_persistent_handles(struct cifs_tcon *tcon) |
| { |
| struct cifsFileInfo *open_file, *tmp; |
| struct list_head tmp_list; |
| |
| if (!tcon->use_persistent || !tcon->need_reopen_files) |
| return; |
| |
| tcon->need_reopen_files = false; |
| |
| cifs_dbg(FYI, "Reopen persistent handles\n"); |
| INIT_LIST_HEAD(&tmp_list); |
| |
| /* list all files open on tree connection, reopen resilient handles */ |
| spin_lock(&tcon->open_file_lock); |
| list_for_each_entry(open_file, &tcon->openFileList, tlist) { |
| if (!open_file->invalidHandle) |
| continue; |
| cifsFileInfo_get(open_file); |
| list_add_tail(&open_file->rlist, &tmp_list); |
| } |
| spin_unlock(&tcon->open_file_lock); |
| |
| list_for_each_entry_safe(open_file, tmp, &tmp_list, rlist) { |
| if (cifs_reopen_file(open_file, false /* do not flush */)) |
| tcon->need_reopen_files = true; |
| list_del_init(&open_file->rlist); |
| cifsFileInfo_put(open_file); |
| } |
| } |
| |
| int cifs_closedir(struct inode *inode, struct file *file) |
| { |
| int rc = 0; |
| unsigned int xid; |
| struct cifsFileInfo *cfile = file->private_data; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| char *buf; |
| |
| cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); |
| |
| if (cfile == NULL) |
| return rc; |
| |
| xid = get_xid(); |
| tcon = tlink_tcon(cfile->tlink); |
| server = tcon->ses->server; |
| |
| cifs_dbg(FYI, "Freeing private data in close dir\n"); |
| spin_lock(&cfile->file_info_lock); |
| if (server->ops->dir_needs_close(cfile)) { |
| cfile->invalidHandle = true; |
| spin_unlock(&cfile->file_info_lock); |
| if (server->ops->close_dir) |
| rc = server->ops->close_dir(xid, tcon, &cfile->fid); |
| else |
| rc = -ENOSYS; |
| cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); |
| /* not much we can do if it fails anyway, ignore rc */ |
| rc = 0; |
| } else |
| spin_unlock(&cfile->file_info_lock); |
| |
| buf = cfile->srch_inf.ntwrk_buf_start; |
| if (buf) { |
| cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); |
| cfile->srch_inf.ntwrk_buf_start = NULL; |
| if (cfile->srch_inf.smallBuf) |
| cifs_small_buf_release(buf); |
| else |
| cifs_buf_release(buf); |
| } |
| |
| cifs_put_tlink(cfile->tlink); |
| kfree(file->private_data); |
| file->private_data = NULL; |
| /* BB can we lock the filestruct while this is going on? */ |
| free_xid(xid); |
| return rc; |
| } |
| |
| static struct cifsLockInfo * |
| cifs_lock_init(__u64 offset, __u64 length, __u8 type, __u16 flags) |
| { |
| struct cifsLockInfo *lock = |
| kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
| if (!lock) |
| return lock; |
| lock->offset = offset; |
| lock->length = length; |
| lock->type = type; |
| lock->pid = current->tgid; |
| lock->flags = flags; |
| INIT_LIST_HEAD(&lock->blist); |
| init_waitqueue_head(&lock->block_q); |
| return lock; |
| } |
| |
| void |
| cifs_del_lock_waiters(struct cifsLockInfo *lock) |
| { |
| struct cifsLockInfo *li, *tmp; |
| list_for_each_entry_safe(li, tmp, &lock->blist, blist) { |
| list_del_init(&li->blist); |
| wake_up(&li->block_q); |
| } |
| } |
| |
| #define CIFS_LOCK_OP 0 |
| #define CIFS_READ_OP 1 |
| #define CIFS_WRITE_OP 2 |
| |
| /* @rw_check : 0 - no op, 1 - read, 2 - write */ |
| static bool |
| cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
| __u64 length, __u8 type, __u16 flags, |
| struct cifsFileInfo *cfile, |
| struct cifsLockInfo **conf_lock, int rw_check) |
| { |
| struct cifsLockInfo *li; |
| struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
| struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
| |
| list_for_each_entry(li, &fdlocks->locks, llist) { |
| if (offset + length <= li->offset || |
| offset >= li->offset + li->length) |
| continue; |
| if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
| server->ops->compare_fids(cfile, cur_cfile)) { |
| /* shared lock prevents write op through the same fid */ |
| if (!(li->type & server->vals->shared_lock_type) || |
| rw_check != CIFS_WRITE_OP) |
| continue; |
| } |
| if ((type & server->vals->shared_lock_type) && |
| ((server->ops->compare_fids(cfile, cur_cfile) && |
| current->tgid == li->pid) || type == li->type)) |
| continue; |
| if (rw_check == CIFS_LOCK_OP && |
| (flags & FL_OFDLCK) && (li->flags & FL_OFDLCK) && |
| server->ops->compare_fids(cfile, cur_cfile)) |
| continue; |
| if (conf_lock) |
| *conf_lock = li; |
| return true; |
| } |
| return false; |
| } |
| |
| bool |
| cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
| __u8 type, __u16 flags, |
| struct cifsLockInfo **conf_lock, int rw_check) |
| { |
| bool rc = false; |
| struct cifs_fid_locks *cur; |
| struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
| |
| list_for_each_entry(cur, &cinode->llist, llist) { |
| rc = cifs_find_fid_lock_conflict(cur, offset, length, type, |
| flags, cfile, conf_lock, |
| rw_check); |
| if (rc) |
| break; |
| } |
| |
| return rc; |
| } |
| |
| /* |
| * Check if there is another lock that prevents us to set the lock (mandatory |
| * style). If such a lock exists, update the flock structure with its |
| * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks |
| * or leave it the same if we can't. Returns 0 if we don't need to request to |
| * the server or 1 otherwise. |
| */ |
| static int |
| cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
| __u8 type, struct file_lock *flock) |
| { |
| int rc = 0; |
| struct cifsLockInfo *conf_lock; |
| struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
| struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
| bool exist; |
| |
| down_read(&cinode->lock_sem); |
| |
| exist = cifs_find_lock_conflict(cfile, offset, length, type, |
| flock->c.flc_flags, &conf_lock, |
| CIFS_LOCK_OP); |
| if (exist) { |
| flock->fl_start = conf_lock->offset; |
| flock->fl_end = conf_lock->offset + conf_lock->length - 1; |
| flock->c.flc_pid = conf_lock->pid; |
| if (conf_lock->type & server->vals->shared_lock_type) |
| flock->c.flc_type = F_RDLCK; |
| else |
| flock->c.flc_type = F_WRLCK; |
| } else if (!cinode->can_cache_brlcks) |
| rc = 1; |
| else |
| flock->c.flc_type = F_UNLCK; |
| |
| up_read(&cinode->lock_sem); |
| return rc; |
| } |
| |
| static void |
| cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
| { |
| struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
| cifs_down_write(&cinode->lock_sem); |
| list_add_tail(&lock->llist, &cfile->llist->locks); |
| up_write(&cinode->lock_sem); |
| } |
| |
| /* |
| * Set the byte-range lock (mandatory style). Returns: |
| * 1) 0, if we set the lock and don't need to request to the server; |
| * 2) 1, if no locks prevent us but we need to request to the server; |
| * 3) -EACCES, if there is a lock that prevents us and wait is false. |
| */ |
| static int |
| cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
| bool wait) |
| { |
| struct cifsLockInfo *conf_lock; |
| struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
| bool exist; |
| int rc = 0; |
| |
| try_again: |
| exist = false; |
| cifs_down_write(&cinode->lock_sem); |
| |
| exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
| lock->type, lock->flags, &conf_lock, |
| CIFS_LOCK_OP); |
| if (!exist && cinode->can_cache_brlcks) { |
| list_add_tail(&lock->llist, &cfile->llist->locks); |
| up_write(&cinode->lock_sem); |
| return rc; |
| } |
| |
| if (!exist) |
| rc = 1; |
| else if (!wait) |
| rc = -EACCES; |
| else { |
| list_add_tail(&lock->blist, &conf_lock->blist); |
| up_write(&cinode->lock_sem); |
| rc = wait_event_interruptible(lock->block_q, |
| (lock->blist.prev == &lock->blist) && |
| (lock->blist.next == &lock->blist)); |
| if (!rc) |
| goto try_again; |
| cifs_down_write(&cinode->lock_sem); |
| list_del_init(&lock->blist); |
| } |
| |
| up_write(&cinode->lock_sem); |
| return rc; |
| } |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| /* |
| * Check if there is another lock that prevents us to set the lock (posix |
| * style). If such a lock exists, update the flock structure with its |
| * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks |
| * or leave it the same if we can't. Returns 0 if we don't need to request to |
| * the server or 1 otherwise. |
| */ |
| static int |
| cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
| { |
| int rc = 0; |
| struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
| unsigned char saved_type = flock->c.flc_type; |
| |
| if ((flock->c.flc_flags & FL_POSIX) == 0) |
| return 1; |
| |
| down_read(&cinode->lock_sem); |
| posix_test_lock(file, flock); |
| |
| if (lock_is_unlock(flock) && !cinode->can_cache_brlcks) { |
| flock->c.flc_type = saved_type; |
| rc = 1; |
| } |
| |
| up_read(&cinode->lock_sem); |
| return rc; |
| } |
| |
| /* |
| * Set the byte-range lock (posix style). Returns: |
| * 1) <0, if the error occurs while setting the lock; |
| * 2) 0, if we set the lock and don't need to request to the server; |
| * 3) FILE_LOCK_DEFERRED, if we will wait for some other file_lock; |
| * 4) FILE_LOCK_DEFERRED + 1, if we need to request to the server. |
| */ |
| static int |
| cifs_posix_lock_set(struct file *file, struct file_lock *flock) |
| { |
| struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
| int rc = FILE_LOCK_DEFERRED + 1; |
| |
| if ((flock->c.flc_flags & FL_POSIX) == 0) |
| return rc; |
| |
| cifs_down_write(&cinode->lock_sem); |
| if (!cinode->can_cache_brlcks) { |
| up_write(&cinode->lock_sem); |
| return rc; |
| } |
| |
| rc = posix_lock_file(file, flock, NULL); |
| up_write(&cinode->lock_sem); |
| return rc; |
| } |
| |
| int |
| cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
| { |
| unsigned int xid; |
| int rc = 0, stored_rc; |
| struct cifsLockInfo *li, *tmp; |
| struct cifs_tcon *tcon; |
| unsigned int num, max_num, max_buf; |
| LOCKING_ANDX_RANGE *buf, *cur; |
| static const int types[] = { |
| LOCKING_ANDX_LARGE_FILES, |
| LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES |
| }; |
| int i; |
| |
| xid = get_xid(); |
| tcon = tlink_tcon(cfile->tlink); |
| |
| /* |
| * Accessing maxBuf is racy with cifs_reconnect - need to store value |
| * and check it before using. |
| */ |
| max_buf = tcon->ses->server->maxBuf; |
| if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE))) { |
| free_xid(xid); |
| return -EINVAL; |
| } |
| |
| BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) > |
| PAGE_SIZE); |
| max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr), |
| PAGE_SIZE); |
| max_num = (max_buf - sizeof(struct smb_hdr)) / |
| sizeof(LOCKING_ANDX_RANGE); |
| buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
| if (!buf) { |
| free_xid(xid); |
| return -ENOMEM; |
| } |
| |
| for (i = 0; i < 2; i++) { |
| cur = buf; |
| num = 0; |
| list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
| if (li->type != types[i]) |
| continue; |
| cur->Pid = cpu_to_le16(li->pid); |
| cur->LengthLow = cpu_to_le32((u32)li->length); |
| cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); |
| cur->OffsetLow = cpu_to_le32((u32)li->offset); |
| cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); |
| if (++num == max_num) { |
| stored_rc = cifs_lockv(xid, tcon, |
| cfile->fid.netfid, |
| (__u8)li->type, 0, num, |
| buf); |
| if (stored_rc) |
| rc = stored_rc; |
| cur = buf; |
| num = 0; |
| } else |
| cur++; |
| } |
| |
| if (num) { |
| stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
| (__u8)types[i], 0, num, buf); |
| if (stored_rc) |
| rc = stored_rc; |
| } |
| } |
| |
| kfree(buf); |
| free_xid(xid); |
| return rc; |
| } |
| |
| static __u32 |
| hash_lockowner(fl_owner_t owner) |
| { |
| return cifs_lock_secret ^ hash32_ptr((const void *)owner); |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| struct lock_to_push { |
| struct list_head llist; |
| __u64 offset; |
| __u64 length; |
| __u32 pid; |
| __u16 netfid; |
| __u8 type; |
| }; |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| static int |
| cifs_push_posix_locks(struct cifsFileInfo *cfile) |
| { |
| struct inode *inode = d_inode(cfile->dentry); |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| struct file_lock *flock; |
| struct file_lock_context *flctx = locks_inode_context(inode); |
| unsigned int count = 0, i; |
| int rc = 0, xid, type; |
| struct list_head locks_to_send, *el; |
| struct lock_to_push *lck, *tmp; |
| __u64 length; |
| |
| xid = get_xid(); |
| |
| if (!flctx) |
| goto out; |
| |
| spin_lock(&flctx->flc_lock); |
| list_for_each(el, &flctx->flc_posix) { |
| count++; |
| } |
| spin_unlock(&flctx->flc_lock); |
| |
| INIT_LIST_HEAD(&locks_to_send); |
| |
| /* |
| * Allocating count locks is enough because no FL_POSIX locks can be |
| * added to the list while we are holding cinode->lock_sem that |
| * protects locking operations of this inode. |
| */ |
| for (i = 0; i < count; i++) { |
| lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); |
| if (!lck) { |
| rc = -ENOMEM; |
| goto err_out; |
| } |
| list_add_tail(&lck->llist, &locks_to_send); |
| } |
| |
| el = locks_to_send.next; |
| spin_lock(&flctx->flc_lock); |
| for_each_file_lock(flock, &flctx->flc_posix) { |
| unsigned char ftype = flock->c.flc_type; |
| |
| if (el == &locks_to_send) { |
| /* |
| * The list ended. We don't have enough allocated |
| * structures - something is really wrong. |
| */ |
| cifs_dbg(VFS, "Can't push all brlocks!\n"); |
| break; |
| } |
| length = cifs_flock_len(flock); |
| if (ftype == F_RDLCK || ftype == F_SHLCK) |
| type = CIFS_RDLCK; |
| else |
| type = CIFS_WRLCK; |
| lck = list_entry(el, struct lock_to_push, llist); |
| lck->pid = hash_lockowner(flock->c.flc_owner); |
| lck->netfid = cfile->fid.netfid; |
| lck->length = length; |
| lck->type = type; |
| lck->offset = flock->fl_start; |
| } |
| spin_unlock(&flctx->flc_lock); |
| |
| list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { |
| int stored_rc; |
| |
| stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
| lck->offset, lck->length, NULL, |
| lck->type, 0); |
| if (stored_rc) |
| rc = stored_rc; |
| list_del(&lck->llist); |
| kfree(lck); |
| } |
| |
| out: |
| free_xid(xid); |
| return rc; |
| err_out: |
| list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { |
| list_del(&lck->llist); |
| kfree(lck); |
| } |
| goto out; |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| static int |
| cifs_push_locks(struct cifsFileInfo *cfile) |
| { |
| struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| int rc = 0; |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| /* we are going to update can_cache_brlcks here - need a write access */ |
| cifs_down_write(&cinode->lock_sem); |
| if (!cinode->can_cache_brlcks) { |
| up_write(&cinode->lock_sem); |
| return rc; |
| } |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| if (cap_unix(tcon->ses) && |
| (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
| rc = cifs_push_posix_locks(cfile); |
| else |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| rc = tcon->ses->server->ops->push_mand_locks(cfile); |
| |
| cinode->can_cache_brlcks = false; |
| up_write(&cinode->lock_sem); |
| return rc; |
| } |
| |
| static void |
| cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
| bool *wait_flag, struct TCP_Server_Info *server) |
| { |
| if (flock->c.flc_flags & FL_POSIX) |
| cifs_dbg(FYI, "Posix\n"); |
| if (flock->c.flc_flags & FL_FLOCK) |
| cifs_dbg(FYI, "Flock\n"); |
| if (flock->c.flc_flags & FL_SLEEP) { |
| cifs_dbg(FYI, "Blocking lock\n"); |
| *wait_flag = true; |
| } |
| if (flock->c.flc_flags & FL_ACCESS) |
| cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); |
| if (flock->c.flc_flags & FL_LEASE) |
| cifs_dbg(FYI, "Lease on file - not implemented yet\n"); |
| if (flock->c.flc_flags & |
| (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
| FL_ACCESS | FL_LEASE | FL_CLOSE | FL_OFDLCK))) |
| cifs_dbg(FYI, "Unknown lock flags 0x%x\n", |
| flock->c.flc_flags); |
| |
| *type = server->vals->large_lock_type; |
| if (lock_is_write(flock)) { |
| cifs_dbg(FYI, "F_WRLCK\n"); |
| *type |= server->vals->exclusive_lock_type; |
| *lock = 1; |
| } else if (lock_is_unlock(flock)) { |
| cifs_dbg(FYI, "F_UNLCK\n"); |
| *type |= server->vals->unlock_lock_type; |
| *unlock = 1; |
| /* Check if unlock includes more than one lock range */ |
| } else if (lock_is_read(flock)) { |
| cifs_dbg(FYI, "F_RDLCK\n"); |
| *type |= server->vals->shared_lock_type; |
| *lock = 1; |
| } else if (flock->c.flc_type == F_EXLCK) { |
| cifs_dbg(FYI, "F_EXLCK\n"); |
| *type |= server->vals->exclusive_lock_type; |
| *lock = 1; |
| } else if (flock->c.flc_type == F_SHLCK) { |
| cifs_dbg(FYI, "F_SHLCK\n"); |
| *type |= server->vals->shared_lock_type; |
| *lock = 1; |
| } else |
| cifs_dbg(FYI, "Unknown type of lock\n"); |
| } |
| |
| static int |
| cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
| bool wait_flag, bool posix_lck, unsigned int xid) |
| { |
| int rc = 0; |
| __u64 length = cifs_flock_len(flock); |
| struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| struct TCP_Server_Info *server = tcon->ses->server; |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| __u16 netfid = cfile->fid.netfid; |
| |
| if (posix_lck) { |
| int posix_lock_type; |
| |
| rc = cifs_posix_lock_test(file, flock); |
| if (!rc) |
| return rc; |
| |
| if (type & server->vals->shared_lock_type) |
| posix_lock_type = CIFS_RDLCK; |
| else |
| posix_lock_type = CIFS_WRLCK; |
| rc = CIFSSMBPosixLock(xid, tcon, netfid, |
| hash_lockowner(flock->c.flc_owner), |
| flock->fl_start, length, flock, |
| posix_lock_type, wait_flag); |
| return rc; |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
| if (!rc) |
| return rc; |
| |
| /* BB we could chain these into one lock request BB */ |
| rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
| 1, 0, false); |
| if (rc == 0) { |
| rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
| type, 0, 1, false); |
| flock->c.flc_type = F_UNLCK; |
| if (rc != 0) |
| cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
| rc); |
| return 0; |
| } |
| |
| if (type & server->vals->shared_lock_type) { |
| flock->c.flc_type = F_WRLCK; |
| return 0; |
| } |
| |
| type &= ~server->vals->exclusive_lock_type; |
| |
| rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
| type | server->vals->shared_lock_type, |
| 1, 0, false); |
| if (rc == 0) { |
| rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
| type | server->vals->shared_lock_type, 0, 1, false); |
| flock->c.flc_type = F_RDLCK; |
| if (rc != 0) |
| cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
| rc); |
| } else |
| flock->c.flc_type = F_WRLCK; |
| |
| return 0; |
| } |
| |
| void |
| cifs_move_llist(struct list_head *source, struct list_head *dest) |
| { |
| struct list_head *li, *tmp; |
| list_for_each_safe(li, tmp, source) |
| list_move(li, dest); |
| } |
| |
| void |
| cifs_free_llist(struct list_head *llist) |
| { |
| struct cifsLockInfo *li, *tmp; |
| list_for_each_entry_safe(li, tmp, llist, llist) { |
| cifs_del_lock_waiters(li); |
| list_del(&li->llist); |
| kfree(li); |
| } |
| } |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| int |
| cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
| unsigned int xid) |
| { |
| int rc = 0, stored_rc; |
| static const int types[] = { |
| LOCKING_ANDX_LARGE_FILES, |
| LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES |
| }; |
| unsigned int i; |
| unsigned int max_num, num, max_buf; |
| LOCKING_ANDX_RANGE *buf, *cur; |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
| struct cifsLockInfo *li, *tmp; |
| __u64 length = cifs_flock_len(flock); |
| struct list_head tmp_llist; |
| |
| INIT_LIST_HEAD(&tmp_llist); |
| |
| /* |
| * Accessing maxBuf is racy with cifs_reconnect - need to store value |
| * and check it before using. |
| */ |
| max_buf = tcon->ses->server->maxBuf; |
| if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE))) |
| return -EINVAL; |
| |
| BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) > |
| PAGE_SIZE); |
| max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr), |
| PAGE_SIZE); |
| max_num = (max_buf - sizeof(struct smb_hdr)) / |
| sizeof(LOCKING_ANDX_RANGE); |
| buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| |
| cifs_down_write(&cinode->lock_sem); |
| for (i = 0; i < 2; i++) { |
| cur = buf; |
| num = 0; |
| list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
| if (flock->fl_start > li->offset || |
| (flock->fl_start + length) < |
| (li->offset + li->length)) |
| continue; |
| if (current->tgid != li->pid) |
| continue; |
| if (types[i] != li->type) |
| continue; |
| if (cinode->can_cache_brlcks) { |
| /* |
| * We can cache brlock requests - simply remove |
| * a lock from the file's list. |
| */ |
| list_del(&li->llist); |
| cifs_del_lock_waiters(li); |
| kfree(li); |
| continue; |
| } |
| cur->Pid = cpu_to_le16(li->pid); |
| cur->LengthLow = cpu_to_le32((u32)li->length); |
| cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); |
| cur->OffsetLow = cpu_to_le32((u32)li->offset); |
| cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); |
| /* |
| * We need to save a lock here to let us add it again to |
| * the file's list if the unlock range request fails on |
| * the server. |
| */ |
| list_move(&li->llist, &tmp_llist); |
| if (++num == max_num) { |
| stored_rc = cifs_lockv(xid, tcon, |
| cfile->fid.netfid, |
| li->type, num, 0, buf); |
| if (stored_rc) { |
| /* |
| * We failed on the unlock range |
| * request - add all locks from the tmp |
| * list to the head of the file's list. |
| */ |
| cifs_move_llist(&tmp_llist, |
| &cfile->llist->locks); |
| rc = stored_rc; |
| } else |
| /* |
| * The unlock range request succeed - |
| * free the tmp list. |
| */ |
| cifs_free_llist(&tmp_llist); |
| cur = buf; |
| num = 0; |
| } else |
| cur++; |
| } |
| if (num) { |
| stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
| types[i], num, 0, buf); |
| if (stored_rc) { |
| cifs_move_llist(&tmp_llist, |
| &cfile->llist->locks); |
| rc = stored_rc; |
| } else |
| cifs_free_llist(&tmp_llist); |
| } |
| } |
| |
| up_write(&cinode->lock_sem); |
| kfree(buf); |
| return rc; |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| |
| static int |
| cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
| bool wait_flag, bool posix_lck, int lock, int unlock, |
| unsigned int xid) |
| { |
| int rc = 0; |
| __u64 length = cifs_flock_len(flock); |
| struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| struct TCP_Server_Info *server = tcon->ses->server; |
| struct inode *inode = d_inode(cfile->dentry); |
| |
| #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
| if (posix_lck) { |
| int posix_lock_type; |
| |
| rc = cifs_posix_lock_set(file, flock); |
| if (rc <= FILE_LOCK_DEFERRED) |
| return rc; |
| |
| if (type & server->vals->shared_lock_type) |
| posix_lock_type = CIFS_RDLCK; |
| else |
| posix_lock_type = CIFS_WRLCK; |
| |
| if (unlock == 1) |
| posix_lock_type = CIFS_UNLCK; |
| |
| rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
| hash_lockowner(flock->c.flc_owner), |
| flock->fl_start, length, |
| NULL, posix_lock_type, wait_flag); |
| goto out; |
| } |
| #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
| if (lock) { |
| struct cifsLockInfo *lock; |
| |
| lock = cifs_lock_init(flock->fl_start, length, type, |
| flock->c.flc_flags); |
| if (!lock) |
| return -ENOMEM; |
| |
| rc = cifs_lock_add_if(cfile, lock, wait_flag); |
| if (rc < 0) { |
| kfree(lock); |
| return rc; |
| } |
| if (!rc) |
| goto out; |
| |
| /* |
| * Windows 7 server can delay breaking lease from read to None |
| * if we set a byte-range lock on a file - break it explicitly |
| * before sending the lock to the server to be sure the next |
| * read won't conflict with non-overlapted locks due to |
| * pagereading. |
| */ |
| if (!CIFS_CACHE_WRITE(CIFS_I(inode)) && |
| CIFS_CACHE_READ(CIFS_I(inode))) { |
| cifs_zap_mapping(inode); |
| cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", |
| inode); |
| CIFS_I(inode)->oplock = 0; |
| } |
| |
| rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
| type, 1, 0, wait_flag); |
| if (rc) { |
| kfree(lock); |
| return rc; |
| } |
| |
| cifs_lock_add(cfile, lock); |
| } else if (unlock) |
| rc = server->ops->mand_unlock_range(cfile, flock, xid); |
| |
| out: |
| if ((flock->c.flc_flags & FL_POSIX) || (flock->c.flc_flags & FL_FLOCK)) { |
| /* |
| * If this is a request to remove all locks because we |
| * are closing the file, it doesn't matter if the |
| * unlocking failed as both cifs.ko and the SMB server |
| * remove the lock on file close |
| */ |
| if (rc) { |
| cifs_dbg(VFS, "%s failed rc=%d\n", __func__, rc); |
| if (!(flock->c.flc_flags & FL_CLOSE)) |
| return rc; |
| } |
| rc = locks_lock_file_wait(file, flock); |
| } |
| return rc; |
| } |
| |
| int cifs_flock(struct file *file, int cmd, struct file_lock *fl) |
| { |
| int rc, xid; |
| int lock = 0, unlock = 0; |
| bool wait_flag = false; |
| bool posix_lck = false; |
| struct cifs_sb_info *cifs_sb; |
| struct cifs_tcon *tcon; |
| struct cifsFileInfo *cfile; |
| __u32 type; |
| |
| xid = get_xid(); |
| |
| if (!(fl->c.flc_flags & FL_FLOCK)) { |
| rc = -ENOLCK; |
| free_xid(xid); |
| return rc; |
| } |
| |
| cfile = (struct cifsFileInfo *)file->private_data; |
| tcon = tlink_tcon(cfile->tlink); |
| |
| cifs_read_flock(fl, &type, &lock, &unlock, &wait_flag, |
| tcon->ses->server); |
| cifs_sb = CIFS_FILE_SB(file); |
| |
| if (cap_unix(tcon->ses) && |
| (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
| posix_lck = true; |
| |
| if (!lock && !unlock) { |
| /* |
| * if no lock or unlock then nothing to do since we do not |
| * know what it is |
| */ |
| rc = -EOPNOTSUPP; |
| free_xid(xid); |
| return rc; |
| } |
| |
| rc = cifs_setlk(file, fl, type, wait_flag, posix_lck, lock, unlock, |
| xid); |
| free_xid(xid); |
| return rc; |
| |
| |
| } |
| |
| int cifs_lock(struct file *file, int cmd, struct file_lock *flock) |
| { |
| int rc, xid; |
| int lock = 0, unlock = 0; |
| bool wait_flag = false; |
| bool posix_lck = false; |
| struct cifs_sb_info *cifs_sb; |
| struct cifs_tcon *tcon; |
| struct cifsFileInfo *cfile; |
| __u32 type; |
| |
| rc = -EACCES; |
| xid = get_xid(); |
| |
| cifs_dbg(FYI, "%s: %pD2 cmd=0x%x type=0x%x flags=0x%x r=%lld:%lld\n", __func__, file, cmd, |
| flock->c.flc_flags, flock->c.flc_type, |
| (long long)flock->fl_start, |
| (long long)flock->fl_end); |
| |
| cfile = (struct cifsFileInfo *)file->private_data; |
| tcon = tlink_tcon(cfile->tlink); |
| |
| cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, |
| tcon->ses->server); |
| cifs_sb = CIFS_FILE_SB(file); |
| set_bit(CIFS_INO_CLOSE_ON_LOCK, &CIFS_I(d_inode(cfile->dentry))->flags); |
| |
| if (cap_unix(tcon->ses) && |
| (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) |
| posix_lck = true; |
| /* |
| * BB add code here to normalize offset and length to account for |
| * negative length which we can not accept over the wire. |
| */ |
| if (IS_GETLK(cmd)) { |
| rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
| free_xid(xid); |
| return rc; |
| } |
| |
| if (!lock && !unlock) { |
| /* |
| * if no lock or unlock then nothing to do since we do not |
| * know what it is |
| */ |
| free_xid(xid); |
| return -EOPNOTSUPP; |
| } |
| |
| rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
| xid); |
| free_xid(xid); |
| return rc; |
| } |
| |
| void cifs_write_subrequest_terminated(struct cifs_io_subrequest *wdata, ssize_t result, |
| bool was_async) |
| { |
| struct netfs_io_request *wreq = wdata->rreq; |
| struct netfs_inode *ictx = netfs_inode(wreq->inode); |
| loff_t wrend; |
| |
| if (result > 0) { |
| wrend = wdata->subreq.start + wdata->subreq.transferred + result; |
| |
| if (wrend > ictx->zero_point && |
| (wdata->rreq->origin == NETFS_UNBUFFERED_WRITE || |
| wdata->rreq->origin == NETFS_DIO_WRITE)) |
| ictx->zero_point = wrend; |
| if (wrend > ictx->remote_i_size) |
| netfs_resize_file(ictx, wrend, true); |
| } |
| |
| netfs_write_subrequest_terminated(&wdata->subreq, result, was_async); |
| } |
| |
| struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
| bool fsuid_only) |
| { |
| struct cifsFileInfo *open_file = NULL; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb); |
| |
| /* only filter by fsuid on multiuser mounts */ |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| fsuid_only = false; |
| |
| spin_lock(&cifs_inode->open_file_lock); |
| /* we could simply get the first_list_entry since write-only entries |
| are always at the end of the list but since the first entry might |
| have a close pending, we go through the whole list */ |
| list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
| if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
| continue; |
| if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
| if ((!open_file->invalidHandle)) { |
| /* found a good file */ |
| /* lock it so it will not be closed on us */ |
| cifsFileInfo_get(open_file); |
| spin_unlock(&cifs_inode->open_file_lock); |
| return open_file; |
| } /* else might as well continue, and look for |
| another, or simply have the caller reopen it |
| again rather than trying to fix this handle */ |
| } else /* write only file */ |
| break; /* write only files are last so must be done */ |
| } |
| spin_unlock(&cifs_inode->open_file_lock); |
| return NULL; |
| } |
| |
| /* Return -EBADF if no handle is found and general rc otherwise */ |
| int |
| cifs_get_writable_file(struct cifsInodeInfo *cifs_inode, int flags, |
| struct cifsFileInfo **ret_file) |
| { |
| struct cifsFileInfo *open_file, *inv_file = NULL; |
| struct cifs_sb_info *cifs_sb; |
| bool any_available = false; |
| int rc = -EBADF; |
| unsigned int refind = 0; |
| bool fsuid_only = flags & FIND_WR_FSUID_ONLY; |
| bool with_delete = flags & FIND_WR_WITH_DELETE; |
| *ret_file = NULL; |
| |
| /* |
| * Having a null inode here (because mapping->host was set to zero by |
| * the VFS or MM) should not happen but we had reports of on oops (due |
| * to it being zero) during stress testcases so we need to check for it |
| */ |
| |
| if (cifs_inode == NULL) { |
| cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); |
| dump_stack(); |
| return rc; |
| } |
| |
| cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb); |
| |
| /* only filter by fsuid on multiuser mounts */ |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| fsuid_only = false; |
| |
| spin_lock(&cifs_inode->open_file_lock); |
| refind_writable: |
| if (refind > MAX_REOPEN_ATT) { |
| spin_unlock(&cifs_inode->open_file_lock); |
| return rc; |
| } |
| list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
| if (!any_available && open_file->pid != current->tgid) |
| continue; |
| if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
| continue; |
| if (with_delete && !(open_file->fid.access & DELETE)) |
| continue; |
| if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
| if (!open_file->invalidHandle) { |
| /* found a good writable file */ |
| cifsFileInfo_get(open_file); |
| spin_unlock(&cifs_inode->open_file_lock); |
| *ret_file = open_file; |
| return 0; |
| } else { |
| if (!inv_file) |
| inv_file = open_file; |
| } |
| } |
| } |
| /* couldn't find useable FH with same pid, try any available */ |
| if (!any_available) { |
| any_available = true; |
| goto refind_writable; |
| } |
| |
| if (inv_file) { |
| any_available = false; |
| cifsFileInfo_get(inv_file); |
| } |
| |
| spin_unlock(&cifs_inode->open_file_lock); |
| |
| if (inv_file) { |
| rc = cifs_reopen_file(inv_file, false); |
| if (!rc) { |
| *ret_file = inv_file; |
| return 0; |
| } |
| |
| spin_lock(&cifs_inode->open_file_lock); |
| list_move_tail(&inv_file->flist, &cifs_inode->openFileList); |
| spin_unlock(&cifs_inode->open_file_lock); |
| cifsFileInfo_put(inv_file); |
| ++refind; |
| inv_file = NULL; |
| spin_lock(&cifs_inode->open_file_lock); |
| goto refind_writable; |
| } |
| |
| return rc; |
| } |
| |
| struct cifsFileInfo * |
| find_writable_file(struct cifsInodeInfo *cifs_inode, int flags) |
| { |
| struct cifsFileInfo *cfile; |
| int rc; |
| |
| rc = cifs_get_writable_file(cifs_inode, flags, &cfile); |
| if (rc) |
| cifs_dbg(FYI, "Couldn't find writable handle rc=%d\n", rc); |
| |
| return cfile; |
| } |
| |
| int |
| cifs_get_writable_path(struct cifs_tcon *tcon, const char *name, |
| int flags, |
| struct cifsFileInfo **ret_file) |
| { |
| struct cifsFileInfo *cfile; |
| void *page = alloc_dentry_path(); |
| |
| *ret_file = NULL; |
| |
| spin_lock(&tcon->open_file_lock); |
| list_for_each_entry(cfile, &tcon->openFileList, tlist) { |
| struct cifsInodeInfo *cinode; |
| const char *full_path = build_path_from_dentry(cfile->dentry, page); |
| if (IS_ERR(full_path)) { |
| spin_unlock(&tcon->open_file_lock); |
| free_dentry_path(page); |
| return PTR_ERR(full_path); |
| } |
| if (strcmp(full_path, name)) |
| continue; |
| |
| cinode = CIFS_I(d_inode(cfile->dentry)); |
| spin_unlock(&tcon->open_file_lock); |
| free_dentry_path(page); |
| return cifs_get_writable_file(cinode, flags, ret_file); |
| } |
| |
| spin_unlock(&tcon->open_file_lock); |
| free_dentry_path(page); |
| return -ENOENT; |
| } |
| |
| int |
| cifs_get_readable_path(struct cifs_tcon *tcon, const char *name, |
| struct cifsFileInfo **ret_file) |
| { |
| struct cifsFileInfo *cfile; |
| void *page = alloc_dentry_path(); |
| |
| *ret_file = NULL; |
| |
| spin_lock(&tcon->open_file_lock); |
| list_for_each_entry(cfile, &tcon->openFileList, tlist) { |
| struct cifsInodeInfo *cinode; |
| const char *full_path = build_path_from_dentry(cfile->dentry, page); |
| if (IS_ERR(full_path)) { |
| spin_unlock(&tcon->open_file_lock); |
| free_dentry_path(page); |
| return PTR_ERR(full_path); |
| } |
| if (strcmp(full_path, name)) |
| continue; |
| |
| cinode = CIFS_I(d_inode(cfile->dentry)); |
| spin_unlock(&tcon->open_file_lock); |
| free_dentry_path(page); |
| *ret_file = find_readable_file(cinode, 0); |
| return *ret_file ? 0 : -ENOENT; |
| } |
| |
| spin_unlock(&tcon->open_file_lock); |
| free_dentry_path(page); |
| return -ENOENT; |
| } |
| |
| /* |
| * Flush data on a strict file. |
| */ |
| int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
| int datasync) |
| { |
| unsigned int xid; |
| int rc = 0; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| struct cifsFileInfo *smbfile = file->private_data; |
| struct inode *inode = file_inode(file); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| |
| rc = file_write_and_wait_range(file, start, end); |
| if (rc) { |
| trace_cifs_fsync_err(inode->i_ino, rc); |
| return rc; |
| } |
| |
| xid = get_xid(); |
| |
| cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
| file, datasync); |
| |
| if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
| rc = cifs_zap_mapping(inode); |
| if (rc) { |
| cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); |
| rc = 0; /* don't care about it in fsync */ |
| } |
| } |
| |
| tcon = tlink_tcon(smbfile->tlink); |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
| server = tcon->ses->server; |
| if (server->ops->flush == NULL) { |
| rc = -ENOSYS; |
| goto strict_fsync_exit; |
| } |
| |
| if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) { |
| smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY); |
| if (smbfile) { |
| rc = server->ops->flush(xid, tcon, &smbfile->fid); |
| cifsFileInfo_put(smbfile); |
| } else |
| cifs_dbg(FYI, "ignore fsync for file not open for write\n"); |
| } else |
| rc = server->ops->flush(xid, tcon, &smbfile->fid); |
| } |
| |
| strict_fsync_exit: |
| free_xid(xid); |
| return rc; |
| } |
| |
| /* |
| * Flush data on a non-strict data. |
| */ |
| int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
| { |
| unsigned int xid; |
| int rc = 0; |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| struct cifsFileInfo *smbfile = file->private_data; |
| struct inode *inode = file_inode(file); |
| struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); |
| |
| rc = file_write_and_wait_range(file, start, end); |
| if (rc) { |
| trace_cifs_fsync_err(file_inode(file)->i_ino, rc); |
| return rc; |
| } |
| |
| xid = get_xid(); |
| |
| cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
| file, datasync); |
| |
| tcon = tlink_tcon(smbfile->tlink); |
| if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
| server = tcon->ses->server; |
| if (server->ops->flush == NULL) { |
| rc = -ENOSYS; |
| goto fsync_exit; |
| } |
| |
| if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) { |
| smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY); |
| if (smbfile) { |
| rc = server->ops->flush(xid, tcon, &smbfile->fid); |
| cifsFileInfo_put(smbfile); |
| } else |
| cifs_dbg(FYI, "ignore fsync for file not open for write\n"); |
| } else |
| rc = server->ops->flush(xid, tcon, &smbfile->fid); |
| } |
| |
| fsync_exit: |
| free_xid(xid); |
| return rc; |
| } |
| |
| /* |
| * As file closes, flush all cached write data for this inode checking |
| * for write behind errors. |
| */ |
| int cifs_flush(struct file *file, fl_owner_t id) |
| { |
| struct inode *inode = file_inode(file); |
| int rc = 0; |
| |
| if (file->f_mode & FMODE_WRITE) |
| rc = filemap_write_and_wait(inode->i_mapping); |
| |
| cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); |
| if (rc) { |
| /* get more nuanced writeback errors */ |
| rc = filemap_check_wb_err(file->f_mapping, 0); |
| trace_cifs_flush_err(inode->i_ino, rc); |
| } |
| return rc; |
| } |
| |
| static ssize_t |
| cifs_writev(struct kiocb *iocb, struct iov_iter *from) |
| { |
| struct file *file = iocb->ki_filp; |
| struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
| struct inode *inode = file->f_mapping->host; |
| struct cifsInodeInfo *cinode = CIFS_I(inode); |
| struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| ssize_t rc; |
| |
| rc = netfs_start_io_write(inode); |
| if (rc < 0) |
| return rc; |
| |
| /* |
| * We need to hold the sem to be sure nobody modifies lock list |
| * with a brlock that prevents writing. |
| */ |
| down_read(&cinode->lock_sem); |
| |
| rc = generic_write_checks(iocb, from); |
| if (rc <= 0) |
| goto out; |
| |
| if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) && |
| (cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from), |
| server->vals->exclusive_lock_type, 0, |
| NULL, CIFS_WRITE_OP))) { |
| rc = -EACCES; |
| goto out; |
| } |
| |
| rc = netfs_buffered_write_iter_locked(iocb, from, NULL); |
| |
| out: |
| up_read(&cinode->lock_sem); |
| netfs_end_io_write(inode); |
| if (rc > 0) |
| rc = generic_write_sync(iocb, rc); |
| return rc; |
| } |
| |
| ssize_t |
| cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) |
| { |
| struct inode *inode = file_inode(iocb->ki_filp); |
| struct cifsInodeInfo *cinode = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifsFileInfo *cfile = (struct cifsFileInfo *) |
| iocb->ki_filp->private_data; |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| ssize_t written; |
| |
| written = cifs_get_writer(cinode); |
| if (written) |
| return written; |
| |
| if (CIFS_CACHE_WRITE(cinode)) { |
| if (cap_unix(tcon->ses) && |
| (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
| ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) { |
| written = netfs_file_write_iter(iocb, from); |
| goto out; |
| } |
| written = cifs_writev(iocb, from); |
| goto out; |
| } |
| /* |
| * For non-oplocked files in strict cache mode we need to write the data |
| * to the server exactly from the pos to pos+len-1 rather than flush all |
| * affected pages because it may cause a error with mandatory locks on |
| * these pages but not on the region from pos to ppos+len-1. |
| */ |
| written = netfs_file_write_iter(iocb, from); |
| if (CIFS_CACHE_READ(cinode)) { |
| /* |
| * We have read level caching and we have just sent a write |
| * request to the server thus making data in the cache stale. |
| * Zap the cache and set oplock/lease level to NONE to avoid |
| * reading stale data from the cache. All subsequent read |
| * operations will read new data from the server. |
| */ |
| cifs_zap_mapping(inode); |
| cifs_dbg(FYI, "Set Oplock/Lease to NONE for inode=%p after write\n", |
| inode); |
| cinode->oplock = 0; |
| } |
| out: |
| cifs_put_writer(cinode); |
| return written; |
| } |
| |
| 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 netfs_unbuffered_read_iter(iocb, iter); |
| |
| rc = cifs_revalidate_mapping(inode); |
| if (rc) |
| return rc; |
| |
| return netfs_file_read_iter(iocb, iter); |
| } |
| |
| 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 = netfs_unbuffered_write_iter(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 = netfs_file_write_iter(iocb, from); |
| |
| if (!CIFS_CACHE_WRITE(CIFS_I(inode))) { |
| rc = filemap_fdatawrite(inode->i_mapping); |
| if (rc) |
| cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n", |
| rc, inode); |
| } |
| |
| cifs_put_writer(cinode); |
| return written; |
| } |
| |
| ssize_t |
| cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to) |
| { |
| struct inode *inode = file_inode(iocb->ki_filp); |
| struct cifsInodeInfo *cinode = CIFS_I(inode); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifsFileInfo *cfile = (struct cifsFileInfo *) |
| iocb->ki_filp->private_data; |
| struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
| int rc = -EACCES; |
| |
| /* |
| * In strict cache mode we need to read from the server all the time |
| * if we don't have level II oplock because the server can delay mtime |
| * change - so we can't make a decision about inode invalidating. |
| * And we can also fail with pagereading if there are mandatory locks |
| * on pages affected by this read but not on the region from pos to |
| * pos+len-1. |
| */ |
| if (!CIFS_CACHE_READ(cinode)) |
| return netfs_unbuffered_read_iter(iocb, to); |
| |
| if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0) { |
| if (iocb->ki_flags & IOCB_DIRECT) |
| return netfs_unbuffered_read_iter(iocb, to); |
| return netfs_buffered_read_iter(iocb, to); |
| } |
| |
| /* |
| * We need to hold the sem to be sure nobody modifies lock list |
| * with a brlock that prevents reading. |
| */ |
| if (iocb->ki_flags & IOCB_DIRECT) { |
| rc = netfs_start_io_direct(inode); |
| if (rc < 0) |
| goto out; |
| rc = -EACCES; |
| down_read(&cinode->lock_sem); |
| if (!cifs_find_lock_conflict( |
| cfile, iocb->ki_pos, iov_iter_count(to), |
| tcon->ses->server->vals->shared_lock_type, |
| 0, NULL, CIFS_READ_OP)) |
| rc = netfs_unbuffered_read_iter_locked(iocb, to); |
| up_read(&cinode->lock_sem); |
| netfs_end_io_direct(inode); |
| } else { |
| rc = netfs_start_io_read(inode); |
| if (rc < 0) |
| goto out; |
| rc = -EACCES; |
| down_read(&cinode->lock_sem); |
| if (!cifs_find_lock_conflict( |
| cfile, iocb->ki_pos, iov_iter_count(to), |
| tcon->ses->server->vals->shared_lock_type, |
| 0, NULL, CIFS_READ_OP)) |
| rc = filemap_read(iocb, to, 0); |
| up_read(&cinode->lock_sem); |
| netfs_end_io_read(inode); |
| } |
| out: |
| return rc; |
| } |
| |
| static vm_fault_t cifs_page_mkwrite(struct vm_fault *vmf) |
| { |
| return netfs_page_mkwrite(vmf, NULL); |
| } |
| |
| static const struct vm_operations_struct cifs_file_vm_ops = { |
| .fault = filemap_fault, |
| .map_pages = filemap_map_pages, |
| .page_mkwrite = cifs_page_mkwrite, |
| }; |
| |
| int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| int xid, rc = 0; |
| struct inode *inode = file_inode(file); |
| |
| xid = get_xid(); |
| |
| if (!CIFS_CACHE_READ(CIFS_I(inode))) |
| rc = cifs_zap_mapping(inode); |
| if (!rc) |
| rc = generic_file_mmap(file, vma); |
| if (!rc) |
| vma->vm_ops = &cifs_file_vm_ops; |
| |
| free_xid(xid); |
| return rc; |
| } |
| |
| int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| int rc, xid; |
| |
| xid = get_xid(); |
| |
| rc = cifs_revalidate_file(file); |
| if (rc) |
| cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", |
| rc); |
| if (!rc) |
| rc = generic_file_mmap(file, vma); |
| if (!rc) |
| vma->vm_ops = &cifs_file_vm_ops; |
| |
| free_xid(xid); |
| return rc; |
| } |
| |
| static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
| { |
| struct cifsFileInfo *open_file; |
| |
| spin_lock(&cifs_inode->open_file_lock); |
| list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
| if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
| spin_unlock(&cifs_inode->open_file_lock); |
| return 1; |
| } |
| } |
| spin_unlock(&cifs_inode->open_file_lock); |
| return 0; |
| } |
| |
| /* We do not want to update the file size from server for inodes |
| open for write - to avoid races with writepage extending |
| the file - in the future we could consider allowing |
| refreshing the inode only on increases in the file size |
| but this is tricky to do without racing with writebehind |
| page caching in the current Linux kernel design */ |
| bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file, |
| bool from_readdir) |
| { |
| if (!cifsInode) |
| return true; |
| |
| if (is_inode_writable(cifsInode) || |
| ((cifsInode->oplock & CIFS_CACHE_RW_FLG) != 0 && from_readdir)) { |
| /* This inode is open for write at least once */ |
| struct cifs_sb_info *cifs_sb; |
| |
| cifs_sb = CIFS_SB(cifsInode->netfs.inode.i_sb); |
| if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
| /* since no page cache to corrupt on directio |
| we can change size safely */ |
| return true; |
| } |
| |
| if (i_size_read(&cifsInode->netfs.inode) < end_of_file) |
| return true; |
| |
| return false; |
| } else |
| return true; |
| } |
| |
| void cifs_oplock_break(struct work_struct *work) |
| { |
| struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, |
| oplock_break); |
| struct inode *inode = d_inode(cfile->dentry); |
| struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
| struct cifsInodeInfo *cinode = CIFS_I(inode); |
| struct cifs_tcon *tcon; |
| struct TCP_Server_Info *server; |
| struct tcon_link *tlink; |
| int rc = 0; |
| bool purge_cache = false, oplock_break_cancelled; |
| __u64 persistent_fid, volatile_fid; |
| __u16 net_fid; |
| |
| wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS, |
| TASK_UNINTERRUPTIBLE); |
| |
| tlink = cifs_sb_tlink(cifs_sb); |
| if (IS_ERR(tlink)) |
| goto out; |
| tcon = tlink_tcon(tlink); |
| server = tcon->ses->server; |
| |
| server->ops->downgrade_oplock(server, cinode, cfile->oplock_level, |
| cfile->oplock_epoch, &purge_cache); |
| |
| if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) && |
| cifs_has_mand_locks(cinode)) { |
| cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", |
| inode); |
| cinode->oplock = 0; |
| } |
| |
| if (inode && S_ISREG(inode->i_mode)) { |
| if (CIFS_CACHE_READ(cinode)) |
| break_lease(inode, O_RDONLY); |
| else |
| break_lease(inode, O_WRONLY); |
| rc = filemap_fdatawrite(inode->i_mapping); |
| if (!CIFS_CACHE_READ(cinode) || purge_cache) { |
| rc = filemap_fdatawait(inode->i_mapping); |
| mapping_set_error(inode->i_mapping, rc); |
| cifs_zap_mapping(inode); |
| } |
| cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); |
| if (CIFS_CACHE_WRITE(cinode)) |
| goto oplock_break_ack; |
| } |
| |
| rc = cifs_push_locks(cfile); |
| if (rc) |
| cifs_dbg(VFS, "Push locks rc = %d\n", rc); |
| |
| oplock_break_ack: |
| /* |
| * When oplock break is received and there are no active |
| * file handles but cached, then schedule deferred close immediately. |
| * So, new open will not use cached handle. |
| */ |
| |
| if (!CIFS_CACHE_HANDLE(cinode) && !list_empty(&cinode->deferred_closes)) |
| cifs_close_deferred_file(cinode); |
| |
| persistent_fid = cfile->fid.persistent_fid; |
| volatile_fid = cfile->fid.volatile_fid; |
| net_fid = cfile->fid.netfid; |
| oplock_break_cancelled = cfile->oplock_break_cancelled; |
| |
| _cifsFileInfo_put(cfile, false /* do not wait for ourself */, false); |
| /* |
| * MS-SMB2 3.2.5.19.1 and 3.2.5.19.2 (and MS-CIFS 3.2.5.42) do not require |
| * an acknowledgment to be sent when the file has already been closed. |
| */ |
| spin_lock(&cinode->open_file_lock); |
| /* check list empty since can race with kill_sb calling tree disconnect */ |
| if (!oplock_break_cancelled && !list_empty(&cinode->openFileList)) { |
| spin_unlock(&cinode->open_file_lock); |
| rc = server->ops->oplock_response(tcon, persistent_fid, |
| volatile_fid, net_fid, cinode); |
| cifs_dbg(FYI, "Oplock release rc = %d\n", rc); |
| } else |
| spin_unlock(&cinode->open_file_lock); |
| |
| cifs_put_tlink(tlink); |
| out: |
| cifs_done_oplock_break(cinode); |
| } |
| |
| static int cifs_swap_activate(struct swap_info_struct *sis, |
| struct file *swap_file, sector_t *span) |
| { |
| struct cifsFileInfo *cfile = swap_file->private_data; |
| struct inode *inode = swap_file->f_mapping->host; |
| unsigned long blocks; |
| long long isize; |
| |
| cifs_dbg(FYI, "swap activate\n"); |
| |
| if (!swap_file->f_mapping->a_ops->swap_rw) |
| /* Cannot support swap */ |
| return -EINVAL; |
| |
| spin_lock(&inode->i_lock); |
| blocks = inode->i_blocks; |
| isize = inode->i_size; |
| spin_unlock(&inode->i_lock); |
| if (blocks*512 < isize) { |
| pr_warn("swap activate: swapfile has holes\n"); |
| return -EINVAL; |
| } |
| *span = sis->pages; |
| |
| pr_warn_once("Swap support over SMB3 is experimental\n"); |
| |
| /* |
| * TODO: consider adding ACL (or documenting how) to prevent other |
| * users (on this or other systems) from reading it |
| */ |
| |
| |
| /* TODO: add sk_set_memalloc(inet) or similar */ |
| |
| if (cfile) |
| cfile->swapfile = true; |
| /* |
| * TODO: Since file already open, we can't open with DENY_ALL here |
| * but we could add call to grab a byte range lock to prevent others |
| * from reading or writing the file |
| */ |
| |
| sis->flags |= SWP_FS_OPS; |
| return add_swap_extent(sis, 0, sis->max, 0); |
| } |
| |
| static void cifs_swap_deactivate(struct file *file) |
| { |
| struct cifsFileInfo *cfile = file->private_data; |
| |
| cifs_dbg(FYI, "swap deactivate\n"); |
| |
| /* TODO: undo sk_set_memalloc(inet) will eventually be needed */ |
| |
| if (cfile) |
| cfile->swapfile = false; |
| |
| /* do we need to unpin (or unlock) the file */ |
| } |
| |
| /** |
| * cifs_swap_rw - SMB3 address space operation for swap I/O |
| * @iocb: target I/O control block |
| * @iter: I/O buffer |
| * |
| * Perform IO to the swap-file. This is much like direct IO. |
| */ |
| static int cifs_swap_rw(struct kiocb *iocb, struct iov_iter *iter) |
| { |
| ssize_t ret; |
| |
| if (iov_iter_rw(iter) == READ) |
| ret = netfs_unbuffered_read_iter_locked(iocb, iter); |
| else |
| ret = netfs_unbuffered_write_iter_locked(iocb, iter, NULL); |
| if (ret < 0) |
| return ret; |
| return 0; |
| } |
| |
| const struct address_space_operations cifs_addr_ops = { |
| .read_folio = netfs_read_folio, |
| .readahead = netfs_readahead, |
| .writepages = netfs_writepages, |
| .dirty_folio = netfs_dirty_folio, |
| .release_folio = netfs_release_folio, |
| .direct_IO = noop_direct_IO, |
| .invalidate_folio = netfs_invalidate_folio, |
| .migrate_folio = filemap_migrate_folio, |
| /* |
| * TODO: investigate and if useful we could add an is_dirty_writeback |
| * helper if needed |
| */ |
| .swap_activate = cifs_swap_activate, |
| .swap_deactivate = cifs_swap_deactivate, |
| .swap_rw = cifs_swap_rw, |
| }; |
| |
| /* |
| * cifs_readahead requires the server to support a buffer large enough to |
| * contain the header plus one complete page of data. Otherwise, we need |
| * to leave cifs_readahead out of the address space operations. |
| */ |
| const struct address_space_operations cifs_addr_ops_smallbuf = { |
| .read_folio = netfs_read_folio, |
| .writepages = netfs_writepages, |
| .dirty_folio = netfs_dirty_folio, |
| .release_folio = netfs_release_folio, |
| .invalidate_folio = netfs_invalidate_folio, |
| .migrate_folio = filemap_migrate_folio, |
| }; |