11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * linux/fs/nfs/file.c 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) 1992 Rick Sladkey 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Changes Copyright (C) 1994 by Florian La Roche 71da177e4SLinus Torvalds * - Do not copy data too often around in the kernel. 81da177e4SLinus Torvalds * - In nfs_file_read the return value of kmalloc wasn't checked. 91da177e4SLinus Torvalds * - Put in a better version of read look-ahead buffering. Original idea 101da177e4SLinus Torvalds * and implementation by Wai S Kok elekokws@ee.nus.sg. 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Expire cache on write to a file by Wai S Kok (Oct 1994). 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * Total rewrite of read side for new NFS buffer cache.. Linus. 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * nfs regular file handling functions 171da177e4SLinus Torvalds */ 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds #include <linux/time.h> 201da177e4SLinus Torvalds #include <linux/kernel.h> 211da177e4SLinus Torvalds #include <linux/errno.h> 221da177e4SLinus Torvalds #include <linux/fcntl.h> 231da177e4SLinus Torvalds #include <linux/stat.h> 241da177e4SLinus Torvalds #include <linux/nfs_fs.h> 251da177e4SLinus Torvalds #include <linux/nfs_mount.h> 261da177e4SLinus Torvalds #include <linux/mm.h> 271da177e4SLinus Torvalds #include <linux/slab.h> 281da177e4SLinus Torvalds #include <linux/pagemap.h> 291da177e4SLinus Torvalds #include <linux/smp_lock.h> 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #include <asm/uaccess.h> 321da177e4SLinus Torvalds #include <asm/system.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #include "delegation.h" 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_FILE 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds static int nfs_file_open(struct inode *, struct file *); 391da177e4SLinus Torvalds static int nfs_file_release(struct inode *, struct file *); 40980802e3STrond Myklebust static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin); 411da177e4SLinus Torvalds static int nfs_file_mmap(struct file *, struct vm_area_struct *); 421da177e4SLinus Torvalds static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *); 431da177e4SLinus Torvalds static ssize_t nfs_file_read(struct kiocb *, char __user *, size_t, loff_t); 441da177e4SLinus Torvalds static ssize_t nfs_file_write(struct kiocb *, const char __user *, size_t, loff_t); 451da177e4SLinus Torvalds static int nfs_file_flush(struct file *); 461da177e4SLinus Torvalds static int nfs_fsync(struct file *, struct dentry *dentry, int datasync); 471da177e4SLinus Torvalds static int nfs_check_flags(int flags); 481da177e4SLinus Torvalds static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); 491da177e4SLinus Torvalds static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds struct file_operations nfs_file_operations = { 52980802e3STrond Myklebust .llseek = nfs_file_llseek, 531da177e4SLinus Torvalds .read = do_sync_read, 541da177e4SLinus Torvalds .write = do_sync_write, 551da177e4SLinus Torvalds .aio_read = nfs_file_read, 561da177e4SLinus Torvalds .aio_write = nfs_file_write, 571da177e4SLinus Torvalds .mmap = nfs_file_mmap, 581da177e4SLinus Torvalds .open = nfs_file_open, 591da177e4SLinus Torvalds .flush = nfs_file_flush, 601da177e4SLinus Torvalds .release = nfs_file_release, 611da177e4SLinus Torvalds .fsync = nfs_fsync, 621da177e4SLinus Torvalds .lock = nfs_lock, 631da177e4SLinus Torvalds .flock = nfs_flock, 641da177e4SLinus Torvalds .sendfile = nfs_file_sendfile, 651da177e4SLinus Torvalds .check_flags = nfs_check_flags, 661da177e4SLinus Torvalds }; 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds struct inode_operations nfs_file_inode_operations = { 691da177e4SLinus Torvalds .permission = nfs_permission, 701da177e4SLinus Torvalds .getattr = nfs_getattr, 711da177e4SLinus Torvalds .setattr = nfs_setattr, 721da177e4SLinus Torvalds }; 731da177e4SLinus Torvalds 74b7fa0554SAndreas Gruenbacher #ifdef CONFIG_NFS_V3 75b7fa0554SAndreas Gruenbacher struct inode_operations nfs3_file_inode_operations = { 76b7fa0554SAndreas Gruenbacher .permission = nfs_permission, 77b7fa0554SAndreas Gruenbacher .getattr = nfs_getattr, 78b7fa0554SAndreas Gruenbacher .setattr = nfs_setattr, 79b7fa0554SAndreas Gruenbacher .listxattr = nfs3_listxattr, 80b7fa0554SAndreas Gruenbacher .getxattr = nfs3_getxattr, 81b7fa0554SAndreas Gruenbacher .setxattr = nfs3_setxattr, 82b7fa0554SAndreas Gruenbacher .removexattr = nfs3_removexattr, 83b7fa0554SAndreas Gruenbacher }; 84b7fa0554SAndreas Gruenbacher #endif /* CONFIG_NFS_v3 */ 85b7fa0554SAndreas Gruenbacher 861da177e4SLinus Torvalds /* Hack for future NFS swap support */ 871da177e4SLinus Torvalds #ifndef IS_SWAPFILE 881da177e4SLinus Torvalds # define IS_SWAPFILE(inode) (0) 891da177e4SLinus Torvalds #endif 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds static int nfs_check_flags(int flags) 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) 941da177e4SLinus Torvalds return -EINVAL; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds return 0; 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds /* 1001da177e4SLinus Torvalds * Open file 1011da177e4SLinus Torvalds */ 1021da177e4SLinus Torvalds static int 1031da177e4SLinus Torvalds nfs_file_open(struct inode *inode, struct file *filp) 1041da177e4SLinus Torvalds { 1051da177e4SLinus Torvalds struct nfs_server *server = NFS_SERVER(inode); 1061da177e4SLinus Torvalds int (*open)(struct inode *, struct file *); 1071da177e4SLinus Torvalds int res; 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds res = nfs_check_flags(filp->f_flags); 1101da177e4SLinus Torvalds if (res) 1111da177e4SLinus Torvalds return res; 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds lock_kernel(); 1141da177e4SLinus Torvalds /* Do NFSv4 open() call */ 1151da177e4SLinus Torvalds if ((open = server->rpc_ops->file_open) != NULL) 1161da177e4SLinus Torvalds res = open(inode, filp); 1171da177e4SLinus Torvalds unlock_kernel(); 1181da177e4SLinus Torvalds return res; 1191da177e4SLinus Torvalds } 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds static int 1221da177e4SLinus Torvalds nfs_file_release(struct inode *inode, struct file *filp) 1231da177e4SLinus Torvalds { 1241da177e4SLinus Torvalds /* Ensure that dirty pages are flushed out with the right creds */ 1251da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 1261da177e4SLinus Torvalds filemap_fdatawrite(filp->f_mapping); 1271da177e4SLinus Torvalds return NFS_PROTO(inode)->file_release(inode, filp); 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 130980802e3STrond Myklebust /** 131fe51beecSTrond Myklebust * nfs_revalidate_file - Revalidate the page cache & related metadata 132fe51beecSTrond Myklebust * @inode - pointer to inode struct 133fe51beecSTrond Myklebust * @file - pointer to file 134fe51beecSTrond Myklebust */ 135fe51beecSTrond Myklebust static int nfs_revalidate_file(struct inode *inode, struct file *filp) 136fe51beecSTrond Myklebust { 13755296809SChuck Lever struct nfs_inode *nfsi = NFS_I(inode); 138fe51beecSTrond Myklebust int retval = 0; 139fe51beecSTrond Myklebust 140b3c52da3STrond Myklebust if ((nfsi->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATTR)) 141b3c52da3STrond Myklebust || nfs_attribute_timeout(inode)) 142fe51beecSTrond Myklebust retval = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 143fe51beecSTrond Myklebust nfs_revalidate_mapping(inode, filp->f_mapping); 144fe51beecSTrond Myklebust return 0; 145fe51beecSTrond Myklebust } 146fe51beecSTrond Myklebust 147fe51beecSTrond Myklebust /** 148980802e3STrond Myklebust * nfs_revalidate_size - Revalidate the file size 149980802e3STrond Myklebust * @inode - pointer to inode struct 150980802e3STrond Myklebust * @file - pointer to struct file 151980802e3STrond Myklebust * 152980802e3STrond Myklebust * Revalidates the file length. This is basically a wrapper around 153980802e3STrond Myklebust * nfs_revalidate_inode() that takes into account the fact that we may 154980802e3STrond Myklebust * have cached writes (in which case we don't care about the server's 155980802e3STrond Myklebust * idea of what the file length is), or O_DIRECT (in which case we 156980802e3STrond Myklebust * shouldn't trust the cache). 157980802e3STrond Myklebust */ 158980802e3STrond Myklebust static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) 159980802e3STrond Myklebust { 160980802e3STrond Myklebust struct nfs_server *server = NFS_SERVER(inode); 161980802e3STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 162980802e3STrond Myklebust 163980802e3STrond Myklebust if (server->flags & NFS_MOUNT_NOAC) 164980802e3STrond Myklebust goto force_reval; 165980802e3STrond Myklebust if (filp->f_flags & O_DIRECT) 166980802e3STrond Myklebust goto force_reval; 167980802e3STrond Myklebust if (nfsi->npages != 0) 168980802e3STrond Myklebust return 0; 16955296809SChuck Lever if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) 170fe51beecSTrond Myklebust return 0; 171980802e3STrond Myklebust force_reval: 172980802e3STrond Myklebust return __nfs_revalidate_inode(server, inode); 173980802e3STrond Myklebust } 174980802e3STrond Myklebust 175980802e3STrond Myklebust static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) 176980802e3STrond Myklebust { 177980802e3STrond Myklebust /* origin == SEEK_END => we must revalidate the cached file length */ 178980802e3STrond Myklebust if (origin == 2) { 179980802e3STrond Myklebust struct inode *inode = filp->f_mapping->host; 180980802e3STrond Myklebust int retval = nfs_revalidate_file_size(inode, filp); 181980802e3STrond Myklebust if (retval < 0) 182980802e3STrond Myklebust return (loff_t)retval; 183980802e3STrond Myklebust } 184980802e3STrond Myklebust return remote_llseek(filp, offset, origin); 185980802e3STrond Myklebust } 186980802e3STrond Myklebust 1871da177e4SLinus Torvalds /* 1881da177e4SLinus Torvalds * Flush all dirty pages, and check for write errors. 1891da177e4SLinus Torvalds * 1901da177e4SLinus Torvalds */ 1911da177e4SLinus Torvalds static int 1921da177e4SLinus Torvalds nfs_file_flush(struct file *file) 1931da177e4SLinus Torvalds { 1941da177e4SLinus Torvalds struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; 1951da177e4SLinus Torvalds struct inode *inode = file->f_dentry->d_inode; 1961da177e4SLinus Torvalds int status; 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds if ((file->f_mode & FMODE_WRITE) == 0) 2011da177e4SLinus Torvalds return 0; 2021da177e4SLinus Torvalds lock_kernel(); 2031da177e4SLinus Torvalds /* Ensure that data+attribute caches are up to date after close() */ 2041da177e4SLinus Torvalds status = nfs_wb_all(inode); 2051da177e4SLinus Torvalds if (!status) { 2061da177e4SLinus Torvalds status = ctx->error; 2071da177e4SLinus Torvalds ctx->error = 0; 2081da177e4SLinus Torvalds if (!status && !nfs_have_delegation(inode, FMODE_READ)) 2091da177e4SLinus Torvalds __nfs_revalidate_inode(NFS_SERVER(inode), inode); 2101da177e4SLinus Torvalds } 2111da177e4SLinus Torvalds unlock_kernel(); 2121da177e4SLinus Torvalds return status; 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds static ssize_t 2161da177e4SLinus Torvalds nfs_file_read(struct kiocb *iocb, char __user * buf, size_t count, loff_t pos) 2171da177e4SLinus Torvalds { 2181da177e4SLinus Torvalds struct dentry * dentry = iocb->ki_filp->f_dentry; 2191da177e4SLinus Torvalds struct inode * inode = dentry->d_inode; 2201da177e4SLinus Torvalds ssize_t result; 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvalds #ifdef CONFIG_NFS_DIRECTIO 2231da177e4SLinus Torvalds if (iocb->ki_filp->f_flags & O_DIRECT) 2241da177e4SLinus Torvalds return nfs_file_direct_read(iocb, buf, count, pos); 2251da177e4SLinus Torvalds #endif 2261da177e4SLinus Torvalds 2271da177e4SLinus Torvalds dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n", 2281da177e4SLinus Torvalds dentry->d_parent->d_name.name, dentry->d_name.name, 2291da177e4SLinus Torvalds (unsigned long) count, (unsigned long) pos); 2301da177e4SLinus Torvalds 231fe51beecSTrond Myklebust result = nfs_revalidate_file(inode, iocb->ki_filp); 2321da177e4SLinus Torvalds if (!result) 2331da177e4SLinus Torvalds result = generic_file_aio_read(iocb, buf, count, pos); 2341da177e4SLinus Torvalds return result; 2351da177e4SLinus Torvalds } 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds static ssize_t 2381da177e4SLinus Torvalds nfs_file_sendfile(struct file *filp, loff_t *ppos, size_t count, 2391da177e4SLinus Torvalds read_actor_t actor, void *target) 2401da177e4SLinus Torvalds { 2411da177e4SLinus Torvalds struct dentry *dentry = filp->f_dentry; 2421da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 2431da177e4SLinus Torvalds ssize_t res; 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds dfprintk(VFS, "nfs: sendfile(%s/%s, %lu@%Lu)\n", 2461da177e4SLinus Torvalds dentry->d_parent->d_name.name, dentry->d_name.name, 2471da177e4SLinus Torvalds (unsigned long) count, (unsigned long long) *ppos); 2481da177e4SLinus Torvalds 249fe51beecSTrond Myklebust res = nfs_revalidate_file(inode, filp); 2501da177e4SLinus Torvalds if (!res) 2511da177e4SLinus Torvalds res = generic_file_sendfile(filp, ppos, count, actor, target); 2521da177e4SLinus Torvalds return res; 2531da177e4SLinus Torvalds } 2541da177e4SLinus Torvalds 2551da177e4SLinus Torvalds static int 2561da177e4SLinus Torvalds nfs_file_mmap(struct file * file, struct vm_area_struct * vma) 2571da177e4SLinus Torvalds { 2581da177e4SLinus Torvalds struct dentry *dentry = file->f_dentry; 2591da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 2601da177e4SLinus Torvalds int status; 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds dfprintk(VFS, "nfs: mmap(%s/%s)\n", 2631da177e4SLinus Torvalds dentry->d_parent->d_name.name, dentry->d_name.name); 2641da177e4SLinus Torvalds 265fe51beecSTrond Myklebust status = nfs_revalidate_file(inode, file); 2661da177e4SLinus Torvalds if (!status) 2671da177e4SLinus Torvalds status = generic_file_mmap(file, vma); 2681da177e4SLinus Torvalds return status; 2691da177e4SLinus Torvalds } 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds /* 2721da177e4SLinus Torvalds * Flush any dirty pages for this process, and check for write errors. 2731da177e4SLinus Torvalds * The return status from this call provides a reliable indication of 2741da177e4SLinus Torvalds * whether any write errors occurred for this process. 2751da177e4SLinus Torvalds */ 2761da177e4SLinus Torvalds static int 2771da177e4SLinus Torvalds nfs_fsync(struct file *file, struct dentry *dentry, int datasync) 2781da177e4SLinus Torvalds { 2791da177e4SLinus Torvalds struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; 2801da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 2811da177e4SLinus Torvalds int status; 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds lock_kernel(); 2861da177e4SLinus Torvalds status = nfs_wb_all(inode); 2871da177e4SLinus Torvalds if (!status) { 2881da177e4SLinus Torvalds status = ctx->error; 2891da177e4SLinus Torvalds ctx->error = 0; 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds unlock_kernel(); 2921da177e4SLinus Torvalds return status; 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds /* 2961da177e4SLinus Torvalds * This does the "real" work of the write. The generic routine has 2971da177e4SLinus Torvalds * allocated the page, locked it, done all the page alignment stuff 2981da177e4SLinus Torvalds * calculations etc. Now we should just copy the data from user 2991da177e4SLinus Torvalds * space and write it back to the real medium.. 3001da177e4SLinus Torvalds * 3011da177e4SLinus Torvalds * If the writer ends up delaying the write, the writer needs to 3021da177e4SLinus Torvalds * increment the page use counts until he is done with the page. 3031da177e4SLinus Torvalds */ 3041da177e4SLinus Torvalds static int nfs_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to) 3051da177e4SLinus Torvalds { 3061da177e4SLinus Torvalds return nfs_flush_incompatible(file, page); 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds static int nfs_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to) 3101da177e4SLinus Torvalds { 3111da177e4SLinus Torvalds long status; 3121da177e4SLinus Torvalds 3131da177e4SLinus Torvalds lock_kernel(); 3141da177e4SLinus Torvalds status = nfs_updatepage(file, page, offset, to-offset); 3151da177e4SLinus Torvalds unlock_kernel(); 3161da177e4SLinus Torvalds return status; 3171da177e4SLinus Torvalds } 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvalds struct address_space_operations nfs_file_aops = { 3201da177e4SLinus Torvalds .readpage = nfs_readpage, 3211da177e4SLinus Torvalds .readpages = nfs_readpages, 3221da177e4SLinus Torvalds .set_page_dirty = __set_page_dirty_nobuffers, 3231da177e4SLinus Torvalds .writepage = nfs_writepage, 3241da177e4SLinus Torvalds .writepages = nfs_writepages, 3251da177e4SLinus Torvalds .prepare_write = nfs_prepare_write, 3261da177e4SLinus Torvalds .commit_write = nfs_commit_write, 3271da177e4SLinus Torvalds #ifdef CONFIG_NFS_DIRECTIO 3281da177e4SLinus Torvalds .direct_IO = nfs_direct_IO, 3291da177e4SLinus Torvalds #endif 3301da177e4SLinus Torvalds }; 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvalds /* 3331da177e4SLinus Torvalds * Write to a file (through the page cache). 3341da177e4SLinus Torvalds */ 3351da177e4SLinus Torvalds static ssize_t 3361da177e4SLinus Torvalds nfs_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos) 3371da177e4SLinus Torvalds { 3381da177e4SLinus Torvalds struct dentry * dentry = iocb->ki_filp->f_dentry; 3391da177e4SLinus Torvalds struct inode * inode = dentry->d_inode; 3401da177e4SLinus Torvalds ssize_t result; 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds #ifdef CONFIG_NFS_DIRECTIO 3431da177e4SLinus Torvalds if (iocb->ki_filp->f_flags & O_DIRECT) 3441da177e4SLinus Torvalds return nfs_file_direct_write(iocb, buf, count, pos); 3451da177e4SLinus Torvalds #endif 3461da177e4SLinus Torvalds 3471da177e4SLinus Torvalds dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%lu)\n", 3481da177e4SLinus Torvalds dentry->d_parent->d_name.name, dentry->d_name.name, 3491da177e4SLinus Torvalds inode->i_ino, (unsigned long) count, (unsigned long) pos); 3501da177e4SLinus Torvalds 3511da177e4SLinus Torvalds result = -EBUSY; 3521da177e4SLinus Torvalds if (IS_SWAPFILE(inode)) 3531da177e4SLinus Torvalds goto out_swapfile; 3547d52e862STrond Myklebust /* 3557d52e862STrond Myklebust * O_APPEND implies that we must revalidate the file length. 3567d52e862STrond Myklebust */ 3577d52e862STrond Myklebust if (iocb->ki_filp->f_flags & O_APPEND) { 3587d52e862STrond Myklebust result = nfs_revalidate_file_size(inode, iocb->ki_filp); 3591da177e4SLinus Torvalds if (result) 3601da177e4SLinus Torvalds goto out; 361fe51beecSTrond Myklebust } 3627d52e862STrond Myklebust nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); 3631da177e4SLinus Torvalds 3641da177e4SLinus Torvalds result = count; 3651da177e4SLinus Torvalds if (!count) 3661da177e4SLinus Torvalds goto out; 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvalds result = generic_file_aio_write(iocb, buf, count, pos); 3691da177e4SLinus Torvalds out: 3701da177e4SLinus Torvalds return result; 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvalds out_swapfile: 3731da177e4SLinus Torvalds printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); 3741da177e4SLinus Torvalds goto out; 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvalds static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) 3781da177e4SLinus Torvalds { 3791da177e4SLinus Torvalds struct inode *inode = filp->f_mapping->host; 3801da177e4SLinus Torvalds int status = 0; 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds lock_kernel(); 3831da177e4SLinus Torvalds /* Use local locking if mounted with "-onolock" */ 3841da177e4SLinus Torvalds if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) 3851da177e4SLinus Torvalds status = NFS_PROTO(inode)->lock(filp, cmd, fl); 3861da177e4SLinus Torvalds else { 3871da177e4SLinus Torvalds struct file_lock *cfl = posix_test_lock(filp, fl); 3881da177e4SLinus Torvalds 3891da177e4SLinus Torvalds fl->fl_type = F_UNLCK; 3901da177e4SLinus Torvalds if (cfl != NULL) 3911da177e4SLinus Torvalds memcpy(fl, cfl, sizeof(*fl)); 3921da177e4SLinus Torvalds } 3931da177e4SLinus Torvalds unlock_kernel(); 3941da177e4SLinus Torvalds return status; 3951da177e4SLinus Torvalds } 3961da177e4SLinus Torvalds 3971da177e4SLinus Torvalds static int do_vfs_lock(struct file *file, struct file_lock *fl) 3981da177e4SLinus Torvalds { 3991da177e4SLinus Torvalds int res = 0; 4001da177e4SLinus Torvalds switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 4011da177e4SLinus Torvalds case FL_POSIX: 4021da177e4SLinus Torvalds res = posix_lock_file_wait(file, fl); 4031da177e4SLinus Torvalds break; 4041da177e4SLinus Torvalds case FL_FLOCK: 4051da177e4SLinus Torvalds res = flock_lock_file_wait(file, fl); 4061da177e4SLinus Torvalds break; 4071da177e4SLinus Torvalds default: 4081da177e4SLinus Torvalds BUG(); 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds if (res < 0) 4111da177e4SLinus Torvalds printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", 4121da177e4SLinus Torvalds __FUNCTION__); 4131da177e4SLinus Torvalds return res; 4141da177e4SLinus Torvalds } 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) 4171da177e4SLinus Torvalds { 4181da177e4SLinus Torvalds struct inode *inode = filp->f_mapping->host; 4191da177e4SLinus Torvalds sigset_t oldset; 4201da177e4SLinus Torvalds int status; 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds rpc_clnt_sigmask(NFS_CLIENT(inode), &oldset); 4231da177e4SLinus Torvalds /* 4241da177e4SLinus Torvalds * Flush all pending writes before doing anything 4251da177e4SLinus Torvalds * with locks.. 4261da177e4SLinus Torvalds */ 4271da177e4SLinus Torvalds filemap_fdatawrite(filp->f_mapping); 4281da177e4SLinus Torvalds down(&inode->i_sem); 4291da177e4SLinus Torvalds nfs_wb_all(inode); 4301da177e4SLinus Torvalds up(&inode->i_sem); 4311da177e4SLinus Torvalds filemap_fdatawait(filp->f_mapping); 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds /* NOTE: special case 4341da177e4SLinus Torvalds * If we're signalled while cleaning up locks on process exit, we 4351da177e4SLinus Torvalds * still need to complete the unlock. 4361da177e4SLinus Torvalds */ 4371da177e4SLinus Torvalds lock_kernel(); 4381da177e4SLinus Torvalds /* Use local locking if mounted with "-onolock" */ 4391da177e4SLinus Torvalds if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) 4401da177e4SLinus Torvalds status = NFS_PROTO(inode)->lock(filp, cmd, fl); 4411da177e4SLinus Torvalds else 4421da177e4SLinus Torvalds status = do_vfs_lock(filp, fl); 4431da177e4SLinus Torvalds unlock_kernel(); 4441da177e4SLinus Torvalds rpc_clnt_sigunmask(NFS_CLIENT(inode), &oldset); 4451da177e4SLinus Torvalds return status; 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) 4491da177e4SLinus Torvalds { 4501da177e4SLinus Torvalds struct inode *inode = filp->f_mapping->host; 4511da177e4SLinus Torvalds sigset_t oldset; 4521da177e4SLinus Torvalds int status; 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds rpc_clnt_sigmask(NFS_CLIENT(inode), &oldset); 4551da177e4SLinus Torvalds /* 4561da177e4SLinus Torvalds * Flush all pending writes before doing anything 4571da177e4SLinus Torvalds * with locks.. 4581da177e4SLinus Torvalds */ 4591da177e4SLinus Torvalds status = filemap_fdatawrite(filp->f_mapping); 4601da177e4SLinus Torvalds if (status == 0) { 4611da177e4SLinus Torvalds down(&inode->i_sem); 4621da177e4SLinus Torvalds status = nfs_wb_all(inode); 4631da177e4SLinus Torvalds up(&inode->i_sem); 4641da177e4SLinus Torvalds if (status == 0) 4651da177e4SLinus Torvalds status = filemap_fdatawait(filp->f_mapping); 4661da177e4SLinus Torvalds } 4671da177e4SLinus Torvalds if (status < 0) 4681da177e4SLinus Torvalds goto out; 4691da177e4SLinus Torvalds 4701da177e4SLinus Torvalds lock_kernel(); 4711da177e4SLinus Torvalds /* Use local locking if mounted with "-onolock" */ 4721da177e4SLinus Torvalds if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) { 4731da177e4SLinus Torvalds status = NFS_PROTO(inode)->lock(filp, cmd, fl); 4741da177e4SLinus Torvalds /* If we were signalled we still need to ensure that 4751da177e4SLinus Torvalds * we clean up any state on the server. We therefore 4761da177e4SLinus Torvalds * record the lock call as having succeeded in order to 4771da177e4SLinus Torvalds * ensure that locks_remove_posix() cleans it out when 4781da177e4SLinus Torvalds * the process exits. 4791da177e4SLinus Torvalds */ 4801da177e4SLinus Torvalds if (status == -EINTR || status == -ERESTARTSYS) 4811da177e4SLinus Torvalds do_vfs_lock(filp, fl); 4821da177e4SLinus Torvalds } else 4831da177e4SLinus Torvalds status = do_vfs_lock(filp, fl); 4841da177e4SLinus Torvalds unlock_kernel(); 4851da177e4SLinus Torvalds if (status < 0) 4861da177e4SLinus Torvalds goto out; 4871da177e4SLinus Torvalds /* 4881da177e4SLinus Torvalds * Make sure we clear the cache whenever we try to get the lock. 4891da177e4SLinus Torvalds * This makes locking act as a cache coherency point. 4901da177e4SLinus Torvalds */ 4911da177e4SLinus Torvalds filemap_fdatawrite(filp->f_mapping); 4921da177e4SLinus Torvalds down(&inode->i_sem); 4931da177e4SLinus Torvalds nfs_wb_all(inode); /* we may have slept */ 4941da177e4SLinus Torvalds up(&inode->i_sem); 4951da177e4SLinus Torvalds filemap_fdatawait(filp->f_mapping); 4961da177e4SLinus Torvalds nfs_zap_caches(inode); 4971da177e4SLinus Torvalds out: 4981da177e4SLinus Torvalds rpc_clnt_sigunmask(NFS_CLIENT(inode), &oldset); 4991da177e4SLinus Torvalds return status; 5001da177e4SLinus Torvalds } 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds /* 5031da177e4SLinus Torvalds * Lock a (portion of) a file 5041da177e4SLinus Torvalds */ 5051da177e4SLinus Torvalds static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) 5061da177e4SLinus Torvalds { 5071da177e4SLinus Torvalds struct inode * inode = filp->f_mapping->host; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n", 5101da177e4SLinus Torvalds inode->i_sb->s_id, inode->i_ino, 5111da177e4SLinus Torvalds fl->fl_type, fl->fl_flags, 5121da177e4SLinus Torvalds (long long)fl->fl_start, (long long)fl->fl_end); 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds if (!inode) 5151da177e4SLinus Torvalds return -EINVAL; 5161da177e4SLinus Torvalds 5171da177e4SLinus Torvalds /* No mandatory locks over NFS */ 5181da177e4SLinus Torvalds if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) 5191da177e4SLinus Torvalds return -ENOLCK; 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds if (IS_GETLK(cmd)) 5221da177e4SLinus Torvalds return do_getlk(filp, cmd, fl); 5231da177e4SLinus Torvalds if (fl->fl_type == F_UNLCK) 5241da177e4SLinus Torvalds return do_unlk(filp, cmd, fl); 5251da177e4SLinus Torvalds return do_setlk(filp, cmd, fl); 5261da177e4SLinus Torvalds } 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds /* 5291da177e4SLinus Torvalds * Lock a (portion of) a file 5301da177e4SLinus Torvalds */ 5311da177e4SLinus Torvalds static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) 5321da177e4SLinus Torvalds { 5331da177e4SLinus Torvalds struct inode * inode = filp->f_mapping->host; 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n", 5361da177e4SLinus Torvalds inode->i_sb->s_id, inode->i_ino, 5371da177e4SLinus Torvalds fl->fl_type, fl->fl_flags); 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvalds if (!inode) 5401da177e4SLinus Torvalds return -EINVAL; 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds /* 5431da177e4SLinus Torvalds * No BSD flocks over NFS allowed. 5441da177e4SLinus Torvalds * Note: we could try to fake a POSIX lock request here by 5451da177e4SLinus Torvalds * using ((u32) filp | 0x80000000) or some such as the pid. 5461da177e4SLinus Torvalds * Not sure whether that would be unique, though, or whether 5471da177e4SLinus Torvalds * that would break in other places. 5481da177e4SLinus Torvalds */ 5491da177e4SLinus Torvalds if (!(fl->fl_flags & FL_FLOCK)) 5501da177e4SLinus Torvalds return -ENOLCK; 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds /* We're simulating flock() locks using posix locks on the server */ 5531da177e4SLinus Torvalds fl->fl_owner = (fl_owner_t)filp; 5541da177e4SLinus Torvalds fl->fl_start = 0; 5551da177e4SLinus Torvalds fl->fl_end = OFFSET_MAX; 5561da177e4SLinus Torvalds 5571da177e4SLinus Torvalds if (fl->fl_type == F_UNLCK) 5581da177e4SLinus Torvalds return do_unlk(filp, cmd, fl); 5591da177e4SLinus Torvalds return do_setlk(filp, cmd, fl); 5601da177e4SLinus Torvalds } 561