Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
484
fs/nfs/file.c
Normal file
484
fs/nfs/file.c
Normal file
@@ -0,0 +1,484 @@
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/*
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* linux/fs/nfs/file.c
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*
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* Copyright (C) 1992 Rick Sladkey
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*
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* Changes Copyright (C) 1994 by Florian La Roche
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* - Do not copy data too often around in the kernel.
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* - In nfs_file_read the return value of kmalloc wasn't checked.
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* - Put in a better version of read look-ahead buffering. Original idea
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* and implementation by Wai S Kok elekokws@ee.nus.sg.
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*
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* Expire cache on write to a file by Wai S Kok (Oct 1994).
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*
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* Total rewrite of read side for new NFS buffer cache.. Linus.
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*
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* nfs regular file handling functions
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*/
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#include <linux/time.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/fcntl.h>
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#include <linux/stat.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_mount.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/smp_lock.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include "delegation.h"
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#define NFSDBG_FACILITY NFSDBG_FILE
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static int nfs_file_open(struct inode *, struct file *);
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static int nfs_file_release(struct inode *, struct file *);
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static int nfs_file_mmap(struct file *, struct vm_area_struct *);
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static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *);
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static ssize_t nfs_file_read(struct kiocb *, char __user *, size_t, loff_t);
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static ssize_t nfs_file_write(struct kiocb *, const char __user *, size_t, loff_t);
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static int nfs_file_flush(struct file *);
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static int nfs_fsync(struct file *, struct dentry *dentry, int datasync);
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static int nfs_check_flags(int flags);
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static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
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static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
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struct file_operations nfs_file_operations = {
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.llseek = remote_llseek,
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.read = do_sync_read,
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.write = do_sync_write,
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.aio_read = nfs_file_read,
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.aio_write = nfs_file_write,
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.mmap = nfs_file_mmap,
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.open = nfs_file_open,
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.flush = nfs_file_flush,
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.release = nfs_file_release,
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.fsync = nfs_fsync,
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.lock = nfs_lock,
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.flock = nfs_flock,
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.sendfile = nfs_file_sendfile,
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.check_flags = nfs_check_flags,
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};
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struct inode_operations nfs_file_inode_operations = {
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.permission = nfs_permission,
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.getattr = nfs_getattr,
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.setattr = nfs_setattr,
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};
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/* Hack for future NFS swap support */
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#ifndef IS_SWAPFILE
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# define IS_SWAPFILE(inode) (0)
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#endif
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static int nfs_check_flags(int flags)
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{
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if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
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return -EINVAL;
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return 0;
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}
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/*
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* Open file
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*/
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static int
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nfs_file_open(struct inode *inode, struct file *filp)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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int (*open)(struct inode *, struct file *);
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int res;
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res = nfs_check_flags(filp->f_flags);
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if (res)
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return res;
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lock_kernel();
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/* Do NFSv4 open() call */
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if ((open = server->rpc_ops->file_open) != NULL)
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res = open(inode, filp);
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unlock_kernel();
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return res;
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}
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static int
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nfs_file_release(struct inode *inode, struct file *filp)
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{
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/* Ensure that dirty pages are flushed out with the right creds */
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if (filp->f_mode & FMODE_WRITE)
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filemap_fdatawrite(filp->f_mapping);
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return NFS_PROTO(inode)->file_release(inode, filp);
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}
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/*
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* Flush all dirty pages, and check for write errors.
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*
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*/
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static int
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nfs_file_flush(struct file *file)
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{
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struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
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struct inode *inode = file->f_dentry->d_inode;
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int status;
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dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
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if ((file->f_mode & FMODE_WRITE) == 0)
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return 0;
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lock_kernel();
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/* Ensure that data+attribute caches are up to date after close() */
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status = nfs_wb_all(inode);
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if (!status) {
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status = ctx->error;
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ctx->error = 0;
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if (!status && !nfs_have_delegation(inode, FMODE_READ))
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__nfs_revalidate_inode(NFS_SERVER(inode), inode);
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}
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unlock_kernel();
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return status;
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}
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static ssize_t
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nfs_file_read(struct kiocb *iocb, char __user * buf, size_t count, loff_t pos)
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{
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struct dentry * dentry = iocb->ki_filp->f_dentry;
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struct inode * inode = dentry->d_inode;
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ssize_t result;
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#ifdef CONFIG_NFS_DIRECTIO
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if (iocb->ki_filp->f_flags & O_DIRECT)
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return nfs_file_direct_read(iocb, buf, count, pos);
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#endif
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dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n",
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dentry->d_parent->d_name.name, dentry->d_name.name,
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(unsigned long) count, (unsigned long) pos);
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result = nfs_revalidate_inode(NFS_SERVER(inode), inode);
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if (!result)
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result = generic_file_aio_read(iocb, buf, count, pos);
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return result;
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}
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static ssize_t
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nfs_file_sendfile(struct file *filp, loff_t *ppos, size_t count,
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read_actor_t actor, void *target)
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{
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struct dentry *dentry = filp->f_dentry;
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struct inode *inode = dentry->d_inode;
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ssize_t res;
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dfprintk(VFS, "nfs: sendfile(%s/%s, %lu@%Lu)\n",
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dentry->d_parent->d_name.name, dentry->d_name.name,
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(unsigned long) count, (unsigned long long) *ppos);
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res = nfs_revalidate_inode(NFS_SERVER(inode), inode);
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if (!res)
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res = generic_file_sendfile(filp, ppos, count, actor, target);
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return res;
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}
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static int
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nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
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{
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struct dentry *dentry = file->f_dentry;
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struct inode *inode = dentry->d_inode;
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int status;
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dfprintk(VFS, "nfs: mmap(%s/%s)\n",
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dentry->d_parent->d_name.name, dentry->d_name.name);
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status = nfs_revalidate_inode(NFS_SERVER(inode), inode);
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if (!status)
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status = generic_file_mmap(file, vma);
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return status;
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}
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/*
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* Flush any dirty pages for this process, and check for write errors.
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* The return status from this call provides a reliable indication of
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* whether any write errors occurred for this process.
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*/
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static int
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nfs_fsync(struct file *file, struct dentry *dentry, int datasync)
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{
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struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
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struct inode *inode = dentry->d_inode;
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int status;
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dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
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lock_kernel();
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status = nfs_wb_all(inode);
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if (!status) {
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status = ctx->error;
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ctx->error = 0;
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}
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unlock_kernel();
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return status;
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}
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/*
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* This does the "real" work of the write. The generic routine has
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* allocated the page, locked it, done all the page alignment stuff
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* calculations etc. Now we should just copy the data from user
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* space and write it back to the real medium..
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*
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* If the writer ends up delaying the write, the writer needs to
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* increment the page use counts until he is done with the page.
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*/
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static int nfs_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
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{
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return nfs_flush_incompatible(file, page);
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}
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static int nfs_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to)
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{
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long status;
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lock_kernel();
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status = nfs_updatepage(file, page, offset, to-offset);
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unlock_kernel();
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return status;
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}
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struct address_space_operations nfs_file_aops = {
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.readpage = nfs_readpage,
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.readpages = nfs_readpages,
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.set_page_dirty = __set_page_dirty_nobuffers,
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.writepage = nfs_writepage,
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.writepages = nfs_writepages,
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.prepare_write = nfs_prepare_write,
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.commit_write = nfs_commit_write,
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#ifdef CONFIG_NFS_DIRECTIO
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.direct_IO = nfs_direct_IO,
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#endif
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};
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/*
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* Write to a file (through the page cache).
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*/
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static ssize_t
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nfs_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos)
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{
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struct dentry * dentry = iocb->ki_filp->f_dentry;
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struct inode * inode = dentry->d_inode;
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ssize_t result;
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#ifdef CONFIG_NFS_DIRECTIO
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if (iocb->ki_filp->f_flags & O_DIRECT)
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return nfs_file_direct_write(iocb, buf, count, pos);
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#endif
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dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%lu)\n",
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dentry->d_parent->d_name.name, dentry->d_name.name,
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inode->i_ino, (unsigned long) count, (unsigned long) pos);
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result = -EBUSY;
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if (IS_SWAPFILE(inode))
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goto out_swapfile;
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result = nfs_revalidate_inode(NFS_SERVER(inode), inode);
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if (result)
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goto out;
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||||
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||||
result = count;
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||||
if (!count)
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||||
goto out;
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||||
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||||
result = generic_file_aio_write(iocb, buf, count, pos);
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||||
out:
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||||
return result;
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||||
out_swapfile:
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||||
printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
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||||
goto out;
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||||
}
|
||||
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||||
static int do_getlk(struct file *filp, int cmd, struct file_lock *fl)
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||||
{
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||||
struct inode *inode = filp->f_mapping->host;
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||||
int status = 0;
|
||||
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||||
lock_kernel();
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||||
/* Use local locking if mounted with "-onolock" */
|
||||
if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
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||||
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
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||||
else {
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||||
struct file_lock *cfl = posix_test_lock(filp, fl);
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||||
|
||||
fl->fl_type = F_UNLCK;
|
||||
if (cfl != NULL)
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||||
memcpy(fl, cfl, sizeof(*fl));
|
||||
}
|
||||
unlock_kernel();
|
||||
return status;
|
||||
}
|
||||
|
||||
static int do_vfs_lock(struct file *file, struct file_lock *fl)
|
||||
{
|
||||
int res = 0;
|
||||
switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
|
||||
case FL_POSIX:
|
||||
res = posix_lock_file_wait(file, fl);
|
||||
break;
|
||||
case FL_FLOCK:
|
||||
res = flock_lock_file_wait(file, fl);
|
||||
break;
|
||||
default:
|
||||
BUG();
|
||||
}
|
||||
if (res < 0)
|
||||
printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n",
|
||||
__FUNCTION__);
|
||||
return res;
|
||||
}
|
||||
|
||||
static int do_unlk(struct file *filp, int cmd, struct file_lock *fl)
|
||||
{
|
||||
struct inode *inode = filp->f_mapping->host;
|
||||
sigset_t oldset;
|
||||
int status;
|
||||
|
||||
rpc_clnt_sigmask(NFS_CLIENT(inode), &oldset);
|
||||
/*
|
||||
* Flush all pending writes before doing anything
|
||||
* with locks..
|
||||
*/
|
||||
filemap_fdatawrite(filp->f_mapping);
|
||||
down(&inode->i_sem);
|
||||
nfs_wb_all(inode);
|
||||
up(&inode->i_sem);
|
||||
filemap_fdatawait(filp->f_mapping);
|
||||
|
||||
/* NOTE: special case
|
||||
* If we're signalled while cleaning up locks on process exit, we
|
||||
* still need to complete the unlock.
|
||||
*/
|
||||
lock_kernel();
|
||||
/* Use local locking if mounted with "-onolock" */
|
||||
if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
|
||||
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
|
||||
else
|
||||
status = do_vfs_lock(filp, fl);
|
||||
unlock_kernel();
|
||||
rpc_clnt_sigunmask(NFS_CLIENT(inode), &oldset);
|
||||
return status;
|
||||
}
|
||||
|
||||
static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
|
||||
{
|
||||
struct inode *inode = filp->f_mapping->host;
|
||||
sigset_t oldset;
|
||||
int status;
|
||||
|
||||
rpc_clnt_sigmask(NFS_CLIENT(inode), &oldset);
|
||||
/*
|
||||
* Flush all pending writes before doing anything
|
||||
* with locks..
|
||||
*/
|
||||
status = filemap_fdatawrite(filp->f_mapping);
|
||||
if (status == 0) {
|
||||
down(&inode->i_sem);
|
||||
status = nfs_wb_all(inode);
|
||||
up(&inode->i_sem);
|
||||
if (status == 0)
|
||||
status = filemap_fdatawait(filp->f_mapping);
|
||||
}
|
||||
if (status < 0)
|
||||
goto out;
|
||||
|
||||
lock_kernel();
|
||||
/* Use local locking if mounted with "-onolock" */
|
||||
if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) {
|
||||
status = NFS_PROTO(inode)->lock(filp, cmd, fl);
|
||||
/* If we were signalled we still need to ensure that
|
||||
* we clean up any state on the server. We therefore
|
||||
* record the lock call as having succeeded in order to
|
||||
* ensure that locks_remove_posix() cleans it out when
|
||||
* the process exits.
|
||||
*/
|
||||
if (status == -EINTR || status == -ERESTARTSYS)
|
||||
do_vfs_lock(filp, fl);
|
||||
} else
|
||||
status = do_vfs_lock(filp, fl);
|
||||
unlock_kernel();
|
||||
if (status < 0)
|
||||
goto out;
|
||||
/*
|
||||
* Make sure we clear the cache whenever we try to get the lock.
|
||||
* This makes locking act as a cache coherency point.
|
||||
*/
|
||||
filemap_fdatawrite(filp->f_mapping);
|
||||
down(&inode->i_sem);
|
||||
nfs_wb_all(inode); /* we may have slept */
|
||||
up(&inode->i_sem);
|
||||
filemap_fdatawait(filp->f_mapping);
|
||||
nfs_zap_caches(inode);
|
||||
out:
|
||||
rpc_clnt_sigunmask(NFS_CLIENT(inode), &oldset);
|
||||
return status;
|
||||
}
|
||||
|
||||
/*
|
||||
* Lock a (portion of) a file
|
||||
*/
|
||||
static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
|
||||
{
|
||||
struct inode * inode = filp->f_mapping->host;
|
||||
|
||||
dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n",
|
||||
inode->i_sb->s_id, inode->i_ino,
|
||||
fl->fl_type, fl->fl_flags,
|
||||
(long long)fl->fl_start, (long long)fl->fl_end);
|
||||
|
||||
if (!inode)
|
||||
return -EINVAL;
|
||||
|
||||
/* No mandatory locks over NFS */
|
||||
if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
|
||||
return -ENOLCK;
|
||||
|
||||
if (IS_GETLK(cmd))
|
||||
return do_getlk(filp, cmd, fl);
|
||||
if (fl->fl_type == F_UNLCK)
|
||||
return do_unlk(filp, cmd, fl);
|
||||
return do_setlk(filp, cmd, fl);
|
||||
}
|
||||
|
||||
/*
|
||||
* Lock a (portion of) a file
|
||||
*/
|
||||
static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
|
||||
{
|
||||
struct inode * inode = filp->f_mapping->host;
|
||||
|
||||
dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n",
|
||||
inode->i_sb->s_id, inode->i_ino,
|
||||
fl->fl_type, fl->fl_flags);
|
||||
|
||||
if (!inode)
|
||||
return -EINVAL;
|
||||
|
||||
/*
|
||||
* No BSD flocks over NFS allowed.
|
||||
* Note: we could try to fake a POSIX lock request here by
|
||||
* using ((u32) filp | 0x80000000) or some such as the pid.
|
||||
* Not sure whether that would be unique, though, or whether
|
||||
* that would break in other places.
|
||||
*/
|
||||
if (!(fl->fl_flags & FL_FLOCK))
|
||||
return -ENOLCK;
|
||||
|
||||
/* We're simulating flock() locks using posix locks on the server */
|
||||
fl->fl_owner = (fl_owner_t)filp;
|
||||
fl->fl_start = 0;
|
||||
fl->fl_end = OFFSET_MAX;
|
||||
|
||||
if (fl->fl_type == F_UNLCK)
|
||||
return do_unlk(filp, cmd, fl);
|
||||
return do_setlk(filp, cmd, fl);
|
||||
}
|
||||
Reference in New Issue
Block a user