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> 30e8edc6e0SAlexey Dobriyan #include <linux/aio.h> 311da177e4SLinus Torvalds 321da177e4SLinus Torvalds #include <asm/uaccess.h> 331da177e4SLinus Torvalds #include <asm/system.h> 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #include "delegation.h" 3694387fb1STrond Myklebust #include "internal.h" 3791d5b470SChuck Lever #include "iostat.h" 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #define NFSDBG_FACILITY NFSDBG_FILE 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds static int nfs_file_open(struct inode *, struct file *); 421da177e4SLinus Torvalds static int nfs_file_release(struct inode *, struct file *); 43980802e3STrond Myklebust static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin); 441da177e4SLinus Torvalds static int nfs_file_mmap(struct file *, struct vm_area_struct *); 45f0930fffSJens Axboe static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos, 46f0930fffSJens Axboe struct pipe_inode_info *pipe, 47f0930fffSJens Axboe size_t count, unsigned int flags); 48027445c3SBadari Pulavarty static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov, 49027445c3SBadari Pulavarty unsigned long nr_segs, loff_t pos); 50027445c3SBadari Pulavarty static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, 51027445c3SBadari Pulavarty unsigned long nr_segs, loff_t pos); 5275e1fcc0SMiklos Szeredi static int nfs_file_flush(struct file *, fl_owner_t id); 5354917786SChuck Lever static int nfs_file_fsync(struct file *, struct dentry *dentry, int datasync); 541da177e4SLinus Torvalds static int nfs_check_flags(int flags); 551da177e4SLinus Torvalds static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); 561da177e4SLinus Torvalds static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); 57370f6599SJ. Bruce Fields static int nfs_setlease(struct file *file, long arg, struct file_lock **fl); 581da177e4SLinus Torvalds 5994387fb1STrond Myklebust static struct vm_operations_struct nfs_file_vm_ops; 6094387fb1STrond Myklebust 614b6f5d20SArjan van de Ven const struct file_operations nfs_file_operations = { 62980802e3STrond Myklebust .llseek = nfs_file_llseek, 631da177e4SLinus Torvalds .read = do_sync_read, 641da177e4SLinus Torvalds .write = do_sync_write, 651da177e4SLinus Torvalds .aio_read = nfs_file_read, 661da177e4SLinus Torvalds .aio_write = nfs_file_write, 67240ee831SBryan Wu #ifdef CONFIG_MMU 681da177e4SLinus Torvalds .mmap = nfs_file_mmap, 69240ee831SBryan Wu #else 70240ee831SBryan Wu .mmap = generic_file_mmap, 71240ee831SBryan Wu #endif 721da177e4SLinus Torvalds .open = nfs_file_open, 731da177e4SLinus Torvalds .flush = nfs_file_flush, 741da177e4SLinus Torvalds .release = nfs_file_release, 7554917786SChuck Lever .fsync = nfs_file_fsync, 761da177e4SLinus Torvalds .lock = nfs_lock, 771da177e4SLinus Torvalds .flock = nfs_flock, 78f0930fffSJens Axboe .splice_read = nfs_file_splice_read, 791da177e4SLinus Torvalds .check_flags = nfs_check_flags, 80370f6599SJ. Bruce Fields .setlease = nfs_setlease, 811da177e4SLinus Torvalds }; 821da177e4SLinus Torvalds 8392e1d5beSArjan van de Ven const struct inode_operations nfs_file_inode_operations = { 841da177e4SLinus Torvalds .permission = nfs_permission, 851da177e4SLinus Torvalds .getattr = nfs_getattr, 861da177e4SLinus Torvalds .setattr = nfs_setattr, 871da177e4SLinus Torvalds }; 881da177e4SLinus Torvalds 89b7fa0554SAndreas Gruenbacher #ifdef CONFIG_NFS_V3 9092e1d5beSArjan van de Ven const struct inode_operations nfs3_file_inode_operations = { 91b7fa0554SAndreas Gruenbacher .permission = nfs_permission, 92b7fa0554SAndreas Gruenbacher .getattr = nfs_getattr, 93b7fa0554SAndreas Gruenbacher .setattr = nfs_setattr, 94b7fa0554SAndreas Gruenbacher .listxattr = nfs3_listxattr, 95b7fa0554SAndreas Gruenbacher .getxattr = nfs3_getxattr, 96b7fa0554SAndreas Gruenbacher .setxattr = nfs3_setxattr, 97b7fa0554SAndreas Gruenbacher .removexattr = nfs3_removexattr, 98b7fa0554SAndreas Gruenbacher }; 99b7fa0554SAndreas Gruenbacher #endif /* CONFIG_NFS_v3 */ 100b7fa0554SAndreas Gruenbacher 1011da177e4SLinus Torvalds /* Hack for future NFS swap support */ 1021da177e4SLinus Torvalds #ifndef IS_SWAPFILE 1031da177e4SLinus Torvalds # define IS_SWAPFILE(inode) (0) 1041da177e4SLinus Torvalds #endif 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvalds static int nfs_check_flags(int flags) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) 1091da177e4SLinus Torvalds return -EINVAL; 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds return 0; 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds /* 1151da177e4SLinus Torvalds * Open file 1161da177e4SLinus Torvalds */ 1171da177e4SLinus Torvalds static int 1181da177e4SLinus Torvalds nfs_file_open(struct inode *inode, struct file *filp) 1191da177e4SLinus Torvalds { 1201da177e4SLinus Torvalds int res; 1211da177e4SLinus Torvalds 1226da24bc9SChuck Lever dprintk("NFS: open file(%s/%s)\n", 123cc0dd2d1SChuck Lever filp->f_path.dentry->d_parent->d_name.name, 124cc0dd2d1SChuck Lever filp->f_path.dentry->d_name.name); 125cc0dd2d1SChuck Lever 1261da177e4SLinus Torvalds res = nfs_check_flags(filp->f_flags); 1271da177e4SLinus Torvalds if (res) 1281da177e4SLinus Torvalds return res; 1291da177e4SLinus Torvalds 13091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSOPEN); 1311da177e4SLinus Torvalds lock_kernel(); 13246cb650cSTrond Myklebust res = nfs_open(inode, filp); 1331da177e4SLinus Torvalds unlock_kernel(); 1341da177e4SLinus Torvalds return res; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds static int 1381da177e4SLinus Torvalds nfs_file_release(struct inode *inode, struct file *filp) 1391da177e4SLinus Torvalds { 1406da24bc9SChuck Lever struct dentry *dentry = filp->f_path.dentry; 1416da24bc9SChuck Lever 1426da24bc9SChuck Lever dprintk("NFS: release(%s/%s)\n", 1436da24bc9SChuck Lever dentry->d_parent->d_name.name, 1446da24bc9SChuck Lever dentry->d_name.name); 1456da24bc9SChuck Lever 1461da177e4SLinus Torvalds /* Ensure that dirty pages are flushed out with the right creds */ 1471da177e4SLinus Torvalds if (filp->f_mode & FMODE_WRITE) 1486da24bc9SChuck Lever nfs_wb_all(dentry->d_inode); 14991d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSRELEASE); 15046cb650cSTrond Myklebust return nfs_release(inode, filp); 1511da177e4SLinus Torvalds } 1521da177e4SLinus Torvalds 153980802e3STrond Myklebust /** 154980802e3STrond Myklebust * nfs_revalidate_size - Revalidate the file size 155980802e3STrond Myklebust * @inode - pointer to inode struct 156980802e3STrond Myklebust * @file - pointer to struct file 157980802e3STrond Myklebust * 158980802e3STrond Myklebust * Revalidates the file length. This is basically a wrapper around 159980802e3STrond Myklebust * nfs_revalidate_inode() that takes into account the fact that we may 160980802e3STrond Myklebust * have cached writes (in which case we don't care about the server's 161980802e3STrond Myklebust * idea of what the file length is), or O_DIRECT (in which case we 162980802e3STrond Myklebust * shouldn't trust the cache). 163980802e3STrond Myklebust */ 164980802e3STrond Myklebust static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) 165980802e3STrond Myklebust { 166980802e3STrond Myklebust struct nfs_server *server = NFS_SERVER(inode); 167980802e3STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 168980802e3STrond Myklebust 169980802e3STrond Myklebust if (server->flags & NFS_MOUNT_NOAC) 170980802e3STrond Myklebust goto force_reval; 171980802e3STrond Myklebust if (filp->f_flags & O_DIRECT) 172980802e3STrond Myklebust goto force_reval; 173980802e3STrond Myklebust if (nfsi->npages != 0) 174980802e3STrond Myklebust return 0; 17555296809SChuck Lever if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) 176fe51beecSTrond Myklebust return 0; 177980802e3STrond Myklebust force_reval: 178980802e3STrond Myklebust return __nfs_revalidate_inode(server, inode); 179980802e3STrond Myklebust } 180980802e3STrond Myklebust 181980802e3STrond Myklebust static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) 182980802e3STrond Myklebust { 1839465efc9SAndi Kleen loff_t loff; 184e89e896dSTrond Myklebust 1856da24bc9SChuck Lever dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", 186b84e06c5SChuck Lever filp->f_path.dentry->d_parent->d_name.name, 187b84e06c5SChuck Lever filp->f_path.dentry->d_name.name, 188b84e06c5SChuck Lever offset, origin); 189b84e06c5SChuck Lever 190980802e3STrond Myklebust /* origin == SEEK_END => we must revalidate the cached file length */ 191aec5e175SJosef 'Jeff' Sipek if (origin == SEEK_END) { 192980802e3STrond Myklebust struct inode *inode = filp->f_mapping->host; 193980802e3STrond Myklebust int retval = nfs_revalidate_file_size(inode, filp); 194980802e3STrond Myklebust if (retval < 0) 195980802e3STrond Myklebust return (loff_t)retval; 196980802e3STrond Myklebust } 1979465efc9SAndi Kleen lock_kernel(); /* BKL needed? */ 1989465efc9SAndi Kleen loff = generic_file_llseek_unlocked(filp, offset, origin); 1999465efc9SAndi Kleen unlock_kernel(); 2009465efc9SAndi Kleen return loff; 201980802e3STrond Myklebust } 202980802e3STrond Myklebust 2031da177e4SLinus Torvalds /* 20454917786SChuck Lever * Helper for nfs_file_flush() and nfs_file_fsync() 2057b159fc1STrond Myklebust * 2067b159fc1STrond Myklebust * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to 2077b159fc1STrond Myklebust * disk, but it retrieves and clears ctx->error after synching, despite 2087b159fc1STrond Myklebust * the two being set at the same time in nfs_context_set_write_error(). 2097b159fc1STrond Myklebust * This is because the former is used to notify the _next_ call to 2107b159fc1STrond Myklebust * nfs_file_write() that a write error occured, and hence cause it to 2117b159fc1STrond Myklebust * fall back to doing a synchronous write. 2127b159fc1STrond Myklebust */ 2137b159fc1STrond Myklebust static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) 2147b159fc1STrond Myklebust { 2157b159fc1STrond Myklebust int have_error, status; 2167b159fc1STrond Myklebust int ret = 0; 2177b159fc1STrond Myklebust 2187b159fc1STrond Myklebust have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 2197b159fc1STrond Myklebust status = nfs_wb_all(inode); 2207b159fc1STrond Myklebust have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); 2217b159fc1STrond Myklebust if (have_error) 2227b159fc1STrond Myklebust ret = xchg(&ctx->error, 0); 2237b159fc1STrond Myklebust if (!ret) 2247b159fc1STrond Myklebust ret = status; 2257b159fc1STrond Myklebust return ret; 2267b159fc1STrond Myklebust } 2277b159fc1STrond Myklebust 2287b159fc1STrond Myklebust /* 2291da177e4SLinus Torvalds * Flush all dirty pages, and check for write errors. 2301da177e4SLinus Torvalds */ 2311da177e4SLinus Torvalds static int 23275e1fcc0SMiklos Szeredi nfs_file_flush(struct file *file, fl_owner_t id) 2331da177e4SLinus Torvalds { 234cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 2356da24bc9SChuck Lever struct dentry *dentry = file->f_path.dentry; 2366da24bc9SChuck Lever struct inode *inode = dentry->d_inode; 2371da177e4SLinus Torvalds int status; 2381da177e4SLinus Torvalds 2396da24bc9SChuck Lever dprintk("NFS: flush(%s/%s)\n", 2406da24bc9SChuck Lever dentry->d_parent->d_name.name, 2416da24bc9SChuck Lever dentry->d_name.name); 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvalds if ((file->f_mode & FMODE_WRITE) == 0) 2441da177e4SLinus Torvalds return 0; 24591d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSFLUSH); 2467b159fc1STrond Myklebust 2471da177e4SLinus Torvalds /* Ensure that data+attribute caches are up to date after close() */ 2487b159fc1STrond Myklebust status = nfs_do_fsync(ctx, inode); 2493338c143STrond Myklebust if (!status) 2503338c143STrond Myklebust nfs_revalidate_inode(NFS_SERVER(inode), inode); 2511da177e4SLinus Torvalds return status; 2521da177e4SLinus Torvalds } 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds static ssize_t 255027445c3SBadari Pulavarty nfs_file_read(struct kiocb *iocb, const struct iovec *iov, 256027445c3SBadari Pulavarty unsigned long nr_segs, loff_t pos) 2571da177e4SLinus Torvalds { 25801cce933SJosef "Jeff" Sipek struct dentry * dentry = iocb->ki_filp->f_path.dentry; 2591da177e4SLinus Torvalds struct inode * inode = dentry->d_inode; 2601da177e4SLinus Torvalds ssize_t result; 261027445c3SBadari Pulavarty size_t count = iov_length(iov, nr_segs); 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvalds if (iocb->ki_filp->f_flags & O_DIRECT) 264027445c3SBadari Pulavarty return nfs_file_direct_read(iocb, iov, nr_segs, pos); 2651da177e4SLinus Torvalds 2666da24bc9SChuck Lever dprintk("NFS: read(%s/%s, %lu@%lu)\n", 2671da177e4SLinus Torvalds dentry->d_parent->d_name.name, dentry->d_name.name, 2681da177e4SLinus Torvalds (unsigned long) count, (unsigned long) pos); 2691da177e4SLinus Torvalds 27044b11874STrond Myklebust result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); 27191d5b470SChuck Lever nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); 2721da177e4SLinus Torvalds if (!result) 273027445c3SBadari Pulavarty result = generic_file_aio_read(iocb, iov, nr_segs, pos); 2741da177e4SLinus Torvalds return result; 2751da177e4SLinus Torvalds } 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds static ssize_t 278f0930fffSJens Axboe nfs_file_splice_read(struct file *filp, loff_t *ppos, 279f0930fffSJens Axboe struct pipe_inode_info *pipe, size_t count, 280f0930fffSJens Axboe unsigned int flags) 2811da177e4SLinus Torvalds { 28201cce933SJosef "Jeff" Sipek struct dentry *dentry = filp->f_path.dentry; 2831da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 2841da177e4SLinus Torvalds ssize_t res; 2851da177e4SLinus Torvalds 2866da24bc9SChuck Lever dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", 2871da177e4SLinus Torvalds dentry->d_parent->d_name.name, dentry->d_name.name, 2881da177e4SLinus Torvalds (unsigned long) count, (unsigned long long) *ppos); 2891da177e4SLinus Torvalds 29044b11874STrond Myklebust res = nfs_revalidate_mapping(inode, filp->f_mapping); 2911da177e4SLinus Torvalds if (!res) 292f0930fffSJens Axboe res = generic_file_splice_read(filp, ppos, pipe, count, flags); 2931da177e4SLinus Torvalds return res; 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvalds static int 2971da177e4SLinus Torvalds nfs_file_mmap(struct file * file, struct vm_area_struct * vma) 2981da177e4SLinus Torvalds { 29901cce933SJosef "Jeff" Sipek struct dentry *dentry = file->f_path.dentry; 3001da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 3011da177e4SLinus Torvalds int status; 3021da177e4SLinus Torvalds 3036da24bc9SChuck Lever dprintk("NFS: mmap(%s/%s)\n", 3041da177e4SLinus Torvalds dentry->d_parent->d_name.name, dentry->d_name.name); 3051da177e4SLinus Torvalds 30644b11874STrond Myklebust status = nfs_revalidate_mapping(inode, file->f_mapping); 30794387fb1STrond Myklebust if (!status) { 30894387fb1STrond Myklebust vma->vm_ops = &nfs_file_vm_ops; 30994387fb1STrond Myklebust vma->vm_flags |= VM_CAN_NONLINEAR; 31094387fb1STrond Myklebust file_accessed(file); 31194387fb1STrond Myklebust } 3121da177e4SLinus Torvalds return status; 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds /* 3161da177e4SLinus Torvalds * Flush any dirty pages for this process, and check for write errors. 3171da177e4SLinus Torvalds * The return status from this call provides a reliable indication of 3181da177e4SLinus Torvalds * whether any write errors occurred for this process. 3191da177e4SLinus Torvalds */ 3201da177e4SLinus Torvalds static int 32154917786SChuck Lever nfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) 3221da177e4SLinus Torvalds { 323cd3758e3STrond Myklebust struct nfs_open_context *ctx = nfs_file_open_context(file); 3241da177e4SLinus Torvalds struct inode *inode = dentry->d_inode; 3251da177e4SLinus Torvalds 3266da24bc9SChuck Lever dprintk("NFS: fsync file(%s/%s) datasync %d\n", 32754917786SChuck Lever dentry->d_parent->d_name.name, dentry->d_name.name, 32854917786SChuck Lever datasync); 3291da177e4SLinus Torvalds 33091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSFSYNC); 3317b159fc1STrond Myklebust return nfs_do_fsync(ctx, inode); 3321da177e4SLinus Torvalds } 3331da177e4SLinus Torvalds 3341da177e4SLinus Torvalds /* 3354899f9c8SNick Piggin * This does the "real" work of the write. We must allocate and lock the 3364899f9c8SNick Piggin * page to be sent back to the generic routine, which then copies the 3374899f9c8SNick Piggin * data from user space. 3381da177e4SLinus Torvalds * 3391da177e4SLinus Torvalds * If the writer ends up delaying the write, the writer needs to 3401da177e4SLinus Torvalds * increment the page use counts until he is done with the page. 3411da177e4SLinus Torvalds */ 3424899f9c8SNick Piggin static int nfs_write_begin(struct file *file, struct address_space *mapping, 3434899f9c8SNick Piggin loff_t pos, unsigned len, unsigned flags, 3444899f9c8SNick Piggin struct page **pagep, void **fsdata) 3451da177e4SLinus Torvalds { 3464899f9c8SNick Piggin int ret; 3474899f9c8SNick Piggin pgoff_t index; 3484899f9c8SNick Piggin struct page *page; 3494899f9c8SNick Piggin index = pos >> PAGE_CACHE_SHIFT; 3504899f9c8SNick Piggin 351b7eaefaaSChuck Lever dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", 352b7eaefaaSChuck Lever file->f_path.dentry->d_parent->d_name.name, 353b7eaefaaSChuck Lever file->f_path.dentry->d_name.name, 354b7eaefaaSChuck Lever mapping->host->i_ino, len, (long long) pos); 355b7eaefaaSChuck Lever 3564899f9c8SNick Piggin page = __grab_cache_page(mapping, index); 3574899f9c8SNick Piggin if (!page) 3584899f9c8SNick Piggin return -ENOMEM; 3594899f9c8SNick Piggin *pagep = page; 3604899f9c8SNick Piggin 3614899f9c8SNick Piggin ret = nfs_flush_incompatible(file, page); 3624899f9c8SNick Piggin if (ret) { 3634899f9c8SNick Piggin unlock_page(page); 3644899f9c8SNick Piggin page_cache_release(page); 3654899f9c8SNick Piggin } 3664899f9c8SNick Piggin return ret; 3671da177e4SLinus Torvalds } 3681da177e4SLinus Torvalds 3694899f9c8SNick Piggin static int nfs_write_end(struct file *file, struct address_space *mapping, 3704899f9c8SNick Piggin loff_t pos, unsigned len, unsigned copied, 3714899f9c8SNick Piggin struct page *page, void *fsdata) 3721da177e4SLinus Torvalds { 3734899f9c8SNick Piggin unsigned offset = pos & (PAGE_CACHE_SIZE - 1); 3744899f9c8SNick Piggin int status; 3751da177e4SLinus Torvalds 376b7eaefaaSChuck Lever dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", 377b7eaefaaSChuck Lever file->f_path.dentry->d_parent->d_name.name, 378b7eaefaaSChuck Lever file->f_path.dentry->d_name.name, 379b7eaefaaSChuck Lever mapping->host->i_ino, len, (long long) pos); 380b7eaefaaSChuck Lever 381efc91ed0STrond Myklebust /* 382efc91ed0STrond Myklebust * Zero any uninitialised parts of the page, and then mark the page 383efc91ed0STrond Myklebust * as up to date if it turns out that we're extending the file. 384efc91ed0STrond Myklebust */ 385efc91ed0STrond Myklebust if (!PageUptodate(page)) { 386efc91ed0STrond Myklebust unsigned pglen = nfs_page_length(page); 387efc91ed0STrond Myklebust unsigned end = offset + len; 388efc91ed0STrond Myklebust 389efc91ed0STrond Myklebust if (pglen == 0) { 390efc91ed0STrond Myklebust zero_user_segments(page, 0, offset, 391efc91ed0STrond Myklebust end, PAGE_CACHE_SIZE); 392efc91ed0STrond Myklebust SetPageUptodate(page); 393efc91ed0STrond Myklebust } else if (end >= pglen) { 394efc91ed0STrond Myklebust zero_user_segment(page, end, PAGE_CACHE_SIZE); 395efc91ed0STrond Myklebust if (offset == 0) 396efc91ed0STrond Myklebust SetPageUptodate(page); 397efc91ed0STrond Myklebust } else 398efc91ed0STrond Myklebust zero_user_segment(page, pglen, PAGE_CACHE_SIZE); 399efc91ed0STrond Myklebust } 400efc91ed0STrond Myklebust 4011da177e4SLinus Torvalds lock_kernel(); 4024899f9c8SNick Piggin status = nfs_updatepage(file, page, offset, copied); 4031da177e4SLinus Torvalds unlock_kernel(); 4044899f9c8SNick Piggin 4054899f9c8SNick Piggin unlock_page(page); 4064899f9c8SNick Piggin page_cache_release(page); 4074899f9c8SNick Piggin 4083d509e54SChuck Lever if (status < 0) 4093d509e54SChuck Lever return status; 4103d509e54SChuck Lever return copied; 4111da177e4SLinus Torvalds } 4121da177e4SLinus Torvalds 4132ff28e22SNeilBrown static void nfs_invalidate_page(struct page *page, unsigned long offset) 414cd52ed35STrond Myklebust { 415b7eaefaaSChuck Lever dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); 416b7eaefaaSChuck Lever 4171c75950bSTrond Myklebust if (offset != 0) 4181c75950bSTrond Myklebust return; 419d2ccddf0STrond Myklebust /* Cancel any unstarted writes on this page */ 4201b3b4a1aSTrond Myklebust nfs_wb_page_cancel(page->mapping->host, page); 421cd52ed35STrond Myklebust } 422cd52ed35STrond Myklebust 423cd52ed35STrond Myklebust static int nfs_release_page(struct page *page, gfp_t gfp) 424cd52ed35STrond Myklebust { 425b7eaefaaSChuck Lever dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); 426b7eaefaaSChuck Lever 427e3db7691STrond Myklebust /* If PagePrivate() is set, then the page is not freeable */ 428ddeff520SNikita Danilov return 0; 429e3db7691STrond Myklebust } 430e3db7691STrond Myklebust 431e3db7691STrond Myklebust static int nfs_launder_page(struct page *page) 432e3db7691STrond Myklebust { 433b7eaefaaSChuck Lever struct inode *inode = page->mapping->host; 434b7eaefaaSChuck Lever 435b7eaefaaSChuck Lever dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", 436b7eaefaaSChuck Lever inode->i_ino, (long long)page_offset(page)); 437b7eaefaaSChuck Lever 438b7eaefaaSChuck Lever return nfs_wb_page(inode, page); 439cd52ed35STrond Myklebust } 440cd52ed35STrond Myklebust 441f5e54d6eSChristoph Hellwig const struct address_space_operations nfs_file_aops = { 4421da177e4SLinus Torvalds .readpage = nfs_readpage, 4431da177e4SLinus Torvalds .readpages = nfs_readpages, 4449cccef95STrond Myklebust .set_page_dirty = __set_page_dirty_nobuffers, 4451da177e4SLinus Torvalds .writepage = nfs_writepage, 4461da177e4SLinus Torvalds .writepages = nfs_writepages, 4474899f9c8SNick Piggin .write_begin = nfs_write_begin, 4484899f9c8SNick Piggin .write_end = nfs_write_end, 449cd52ed35STrond Myklebust .invalidatepage = nfs_invalidate_page, 450cd52ed35STrond Myklebust .releasepage = nfs_release_page, 4511da177e4SLinus Torvalds .direct_IO = nfs_direct_IO, 452e3db7691STrond Myklebust .launder_page = nfs_launder_page, 4531da177e4SLinus Torvalds }; 4541da177e4SLinus Torvalds 45594387fb1STrond Myklebust static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page) 45694387fb1STrond Myklebust { 45794387fb1STrond Myklebust struct file *filp = vma->vm_file; 458b7eaefaaSChuck Lever struct dentry *dentry = filp->f_path.dentry; 45994387fb1STrond Myklebust unsigned pagelen; 46094387fb1STrond Myklebust int ret = -EINVAL; 4614899f9c8SNick Piggin struct address_space *mapping; 46294387fb1STrond Myklebust 463b7eaefaaSChuck Lever dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", 464b7eaefaaSChuck Lever dentry->d_parent->d_name.name, dentry->d_name.name, 465b7eaefaaSChuck Lever filp->f_mapping->host->i_ino, 466b7eaefaaSChuck Lever (long long)page_offset(page)); 467b7eaefaaSChuck Lever 46894387fb1STrond Myklebust lock_page(page); 4694899f9c8SNick Piggin mapping = page->mapping; 470b7eaefaaSChuck Lever if (mapping != dentry->d_inode->i_mapping) 4718b1f9ee5STrond Myklebust goto out_unlock; 4728b1f9ee5STrond Myklebust 4738b1f9ee5STrond Myklebust ret = 0; 4744899f9c8SNick Piggin pagelen = nfs_page_length(page); 4758b1f9ee5STrond Myklebust if (pagelen == 0) 4768b1f9ee5STrond Myklebust goto out_unlock; 4778b1f9ee5STrond Myklebust 4788b1f9ee5STrond Myklebust ret = nfs_flush_incompatible(filp, page); 4798b1f9ee5STrond Myklebust if (ret != 0) 4808b1f9ee5STrond Myklebust goto out_unlock; 4818b1f9ee5STrond Myklebust 4828b1f9ee5STrond Myklebust ret = nfs_updatepage(filp, page, 0, pagelen); 4838b1f9ee5STrond Myklebust if (ret == 0) 4848b1f9ee5STrond Myklebust ret = pagelen; 4858b1f9ee5STrond Myklebust out_unlock: 4864899f9c8SNick Piggin unlock_page(page); 48794387fb1STrond Myklebust return ret; 48894387fb1STrond Myklebust } 48994387fb1STrond Myklebust 49094387fb1STrond Myklebust static struct vm_operations_struct nfs_file_vm_ops = { 49194387fb1STrond Myklebust .fault = filemap_fault, 49294387fb1STrond Myklebust .page_mkwrite = nfs_vm_page_mkwrite, 49394387fb1STrond Myklebust }; 49494387fb1STrond Myklebust 4957b159fc1STrond Myklebust static int nfs_need_sync_write(struct file *filp, struct inode *inode) 4967b159fc1STrond Myklebust { 4977b159fc1STrond Myklebust struct nfs_open_context *ctx; 4987b159fc1STrond Myklebust 4997b159fc1STrond Myklebust if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) 5007b159fc1STrond Myklebust return 1; 501cd3758e3STrond Myklebust ctx = nfs_file_open_context(filp); 5027b159fc1STrond Myklebust if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) 5037b159fc1STrond Myklebust return 1; 5047b159fc1STrond Myklebust return 0; 5057b159fc1STrond Myklebust } 5067b159fc1STrond Myklebust 507027445c3SBadari Pulavarty static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, 508027445c3SBadari Pulavarty unsigned long nr_segs, loff_t pos) 5091da177e4SLinus Torvalds { 51001cce933SJosef "Jeff" Sipek struct dentry * dentry = iocb->ki_filp->f_path.dentry; 5111da177e4SLinus Torvalds struct inode * inode = dentry->d_inode; 5121da177e4SLinus Torvalds ssize_t result; 513027445c3SBadari Pulavarty size_t count = iov_length(iov, nr_segs); 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds if (iocb->ki_filp->f_flags & O_DIRECT) 516027445c3SBadari Pulavarty return nfs_file_direct_write(iocb, iov, nr_segs, pos); 5171da177e4SLinus Torvalds 5186da24bc9SChuck Lever dprintk("NFS: write(%s/%s, %lu@%Ld)\n", 5191da177e4SLinus Torvalds dentry->d_parent->d_name.name, dentry->d_name.name, 5206da24bc9SChuck Lever (unsigned long) count, (long long) pos); 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds result = -EBUSY; 5231da177e4SLinus Torvalds if (IS_SWAPFILE(inode)) 5241da177e4SLinus Torvalds goto out_swapfile; 5257d52e862STrond Myklebust /* 5267d52e862STrond Myklebust * O_APPEND implies that we must revalidate the file length. 5277d52e862STrond Myklebust */ 5287d52e862STrond Myklebust if (iocb->ki_filp->f_flags & O_APPEND) { 5297d52e862STrond Myklebust result = nfs_revalidate_file_size(inode, iocb->ki_filp); 5301da177e4SLinus Torvalds if (result) 5311da177e4SLinus Torvalds goto out; 532fe51beecSTrond Myklebust } 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds result = count; 5351da177e4SLinus Torvalds if (!count) 5361da177e4SLinus Torvalds goto out; 5371da177e4SLinus Torvalds 53891d5b470SChuck Lever nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); 539027445c3SBadari Pulavarty result = generic_file_aio_write(iocb, iov, nr_segs, pos); 540200baa21STrond Myklebust /* Return error values for O_SYNC and IS_SYNC() */ 5417b159fc1STrond Myklebust if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { 542cd3758e3STrond Myklebust int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode); 543200baa21STrond Myklebust if (err < 0) 544200baa21STrond Myklebust result = err; 545200baa21STrond Myklebust } 5461da177e4SLinus Torvalds out: 5471da177e4SLinus Torvalds return result; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds out_swapfile: 5501da177e4SLinus Torvalds printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); 5511da177e4SLinus Torvalds goto out; 5521da177e4SLinus Torvalds } 5531da177e4SLinus Torvalds 5541da177e4SLinus Torvalds static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) 5551da177e4SLinus Torvalds { 5561da177e4SLinus Torvalds struct inode *inode = filp->f_mapping->host; 5571da177e4SLinus Torvalds int status = 0; 5581da177e4SLinus Torvalds 5591da177e4SLinus Torvalds lock_kernel(); 560039c4d7aSTrond Myklebust /* Try local locking first */ 5616d34ac19SJ. Bruce Fields posix_test_lock(filp, fl); 5626d34ac19SJ. Bruce Fields if (fl->fl_type != F_UNLCK) { 5636d34ac19SJ. Bruce Fields /* found a conflict */ 564039c4d7aSTrond Myklebust goto out; 5651da177e4SLinus Torvalds } 566039c4d7aSTrond Myklebust 567039c4d7aSTrond Myklebust if (nfs_have_delegation(inode, FMODE_READ)) 568039c4d7aSTrond Myklebust goto out_noconflict; 569039c4d7aSTrond Myklebust 570039c4d7aSTrond Myklebust if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) 571039c4d7aSTrond Myklebust goto out_noconflict; 572039c4d7aSTrond Myklebust 573039c4d7aSTrond Myklebust status = NFS_PROTO(inode)->lock(filp, cmd, fl); 574039c4d7aSTrond Myklebust out: 5751da177e4SLinus Torvalds unlock_kernel(); 5761da177e4SLinus Torvalds return status; 577039c4d7aSTrond Myklebust out_noconflict: 578039c4d7aSTrond Myklebust fl->fl_type = F_UNLCK; 579039c4d7aSTrond Myklebust goto out; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds 5821da177e4SLinus Torvalds static int do_vfs_lock(struct file *file, struct file_lock *fl) 5831da177e4SLinus Torvalds { 5841da177e4SLinus Torvalds int res = 0; 5851da177e4SLinus Torvalds switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { 5861da177e4SLinus Torvalds case FL_POSIX: 5871da177e4SLinus Torvalds res = posix_lock_file_wait(file, fl); 5881da177e4SLinus Torvalds break; 5891da177e4SLinus Torvalds case FL_FLOCK: 5901da177e4SLinus Torvalds res = flock_lock_file_wait(file, fl); 5911da177e4SLinus Torvalds break; 5921da177e4SLinus Torvalds default: 5931da177e4SLinus Torvalds BUG(); 5941da177e4SLinus Torvalds } 5951da177e4SLinus Torvalds if (res < 0) 59646bae1a9SNeil Brown dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" 59746bae1a9SNeil Brown " - error %d!\n", 5983110ff80SHarvey Harrison __func__, res); 5991da177e4SLinus Torvalds return res; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds 6021da177e4SLinus Torvalds static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) 6031da177e4SLinus Torvalds { 6041da177e4SLinus Torvalds struct inode *inode = filp->f_mapping->host; 6051da177e4SLinus Torvalds int status; 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvalds /* 6081da177e4SLinus Torvalds * Flush all pending writes before doing anything 6091da177e4SLinus Torvalds * with locks.. 6101da177e4SLinus Torvalds */ 61129884df0STrond Myklebust nfs_sync_mapping(filp->f_mapping); 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds /* NOTE: special case 6141da177e4SLinus Torvalds * If we're signalled while cleaning up locks on process exit, we 6151da177e4SLinus Torvalds * still need to complete the unlock. 6161da177e4SLinus Torvalds */ 6171da177e4SLinus Torvalds lock_kernel(); 6181da177e4SLinus Torvalds /* Use local locking if mounted with "-onolock" */ 6191da177e4SLinus Torvalds if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) 6201da177e4SLinus Torvalds status = NFS_PROTO(inode)->lock(filp, cmd, fl); 6211da177e4SLinus Torvalds else 6221da177e4SLinus Torvalds status = do_vfs_lock(filp, fl); 6231da177e4SLinus Torvalds unlock_kernel(); 6241da177e4SLinus Torvalds return status; 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) 6281da177e4SLinus Torvalds { 6291da177e4SLinus Torvalds struct inode *inode = filp->f_mapping->host; 6301da177e4SLinus Torvalds int status; 6311da177e4SLinus Torvalds 6321da177e4SLinus Torvalds /* 6331da177e4SLinus Torvalds * Flush all pending writes before doing anything 6341da177e4SLinus Torvalds * with locks.. 6351da177e4SLinus Torvalds */ 63629884df0STrond Myklebust status = nfs_sync_mapping(filp->f_mapping); 63729884df0STrond Myklebust if (status != 0) 6381da177e4SLinus Torvalds goto out; 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds lock_kernel(); 6411da177e4SLinus Torvalds /* Use local locking if mounted with "-onolock" */ 642c4d7c402STrond Myklebust if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) 6431da177e4SLinus Torvalds status = NFS_PROTO(inode)->lock(filp, cmd, fl); 644c4d7c402STrond Myklebust else 6451da177e4SLinus Torvalds status = do_vfs_lock(filp, fl); 6461da177e4SLinus Torvalds unlock_kernel(); 6471da177e4SLinus Torvalds if (status < 0) 6481da177e4SLinus Torvalds goto out; 6491da177e4SLinus Torvalds /* 6501da177e4SLinus Torvalds * Make sure we clear the cache whenever we try to get the lock. 6511da177e4SLinus Torvalds * This makes locking act as a cache coherency point. 6521da177e4SLinus Torvalds */ 65329884df0STrond Myklebust nfs_sync_mapping(filp->f_mapping); 654b5418383STrond Myklebust if (!nfs_have_delegation(inode, FMODE_READ)) 6551da177e4SLinus Torvalds nfs_zap_caches(inode); 6561da177e4SLinus Torvalds out: 6571da177e4SLinus Torvalds return status; 6581da177e4SLinus Torvalds } 6591da177e4SLinus Torvalds 6601da177e4SLinus Torvalds /* 6611da177e4SLinus Torvalds * Lock a (portion of) a file 6621da177e4SLinus Torvalds */ 6631da177e4SLinus Torvalds static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) 6641da177e4SLinus Torvalds { 6651da177e4SLinus Torvalds struct inode *inode = filp->f_mapping->host; 6662116271aSTrond Myklebust int ret = -ENOLCK; 6671da177e4SLinus Torvalds 6686da24bc9SChuck Lever dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", 6696da24bc9SChuck Lever filp->f_path.dentry->d_parent->d_name.name, 6706da24bc9SChuck Lever filp->f_path.dentry->d_name.name, 6711da177e4SLinus Torvalds fl->fl_type, fl->fl_flags, 6721da177e4SLinus Torvalds (long long)fl->fl_start, (long long)fl->fl_end); 6736da24bc9SChuck Lever 67491d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSLOCK); 6751da177e4SLinus Torvalds 6761da177e4SLinus Torvalds /* No mandatory locks over NFS */ 677dfad9441SPavel Emelyanov if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) 6782116271aSTrond Myklebust goto out_err; 6792116271aSTrond Myklebust 6802116271aSTrond Myklebust if (NFS_PROTO(inode)->lock_check_bounds != NULL) { 6812116271aSTrond Myklebust ret = NFS_PROTO(inode)->lock_check_bounds(fl); 6822116271aSTrond Myklebust if (ret < 0) 6832116271aSTrond Myklebust goto out_err; 6842116271aSTrond Myklebust } 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds if (IS_GETLK(cmd)) 6872116271aSTrond Myklebust ret = do_getlk(filp, cmd, fl); 6882116271aSTrond Myklebust else if (fl->fl_type == F_UNLCK) 6892116271aSTrond Myklebust ret = do_unlk(filp, cmd, fl); 6902116271aSTrond Myklebust else 6912116271aSTrond Myklebust ret = do_setlk(filp, cmd, fl); 6922116271aSTrond Myklebust out_err: 6932116271aSTrond Myklebust return ret; 6941da177e4SLinus Torvalds } 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds /* 6971da177e4SLinus Torvalds * Lock a (portion of) a file 6981da177e4SLinus Torvalds */ 6991da177e4SLinus Torvalds static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) 7001da177e4SLinus Torvalds { 7016da24bc9SChuck Lever dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", 7026da24bc9SChuck Lever filp->f_path.dentry->d_parent->d_name.name, 7036da24bc9SChuck Lever filp->f_path.dentry->d_name.name, 7041da177e4SLinus Torvalds fl->fl_type, fl->fl_flags); 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds /* 7071da177e4SLinus Torvalds * No BSD flocks over NFS allowed. 7081da177e4SLinus Torvalds * Note: we could try to fake a POSIX lock request here by 7091da177e4SLinus Torvalds * using ((u32) filp | 0x80000000) or some such as the pid. 7101da177e4SLinus Torvalds * Not sure whether that would be unique, though, or whether 7111da177e4SLinus Torvalds * that would break in other places. 7121da177e4SLinus Torvalds */ 7131da177e4SLinus Torvalds if (!(fl->fl_flags & FL_FLOCK)) 7141da177e4SLinus Torvalds return -ENOLCK; 7151da177e4SLinus Torvalds 7161da177e4SLinus Torvalds /* We're simulating flock() locks using posix locks on the server */ 7171da177e4SLinus Torvalds fl->fl_owner = (fl_owner_t)filp; 7181da177e4SLinus Torvalds fl->fl_start = 0; 7191da177e4SLinus Torvalds fl->fl_end = OFFSET_MAX; 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds if (fl->fl_type == F_UNLCK) 7221da177e4SLinus Torvalds return do_unlk(filp, cmd, fl); 7231da177e4SLinus Torvalds return do_setlk(filp, cmd, fl); 7241da177e4SLinus Torvalds } 725370f6599SJ. Bruce Fields 7266da24bc9SChuck Lever /* 7276da24bc9SChuck Lever * There is no protocol support for leases, so we have no way to implement 7286da24bc9SChuck Lever * them correctly in the face of opens by other clients. 7296da24bc9SChuck Lever */ 730370f6599SJ. Bruce Fields static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) 731370f6599SJ. Bruce Fields { 7326da24bc9SChuck Lever dprintk("NFS: setlease(%s/%s, arg=%ld)\n", 7336da24bc9SChuck Lever file->f_path.dentry->d_parent->d_name.name, 7346da24bc9SChuck Lever file->f_path.dentry->d_name.name, arg); 7356da24bc9SChuck Lever 736370f6599SJ. Bruce Fields return -EINVAL; 737370f6599SJ. Bruce Fields } 738