mirror of https://gitee.com/openkylin/linux.git
220 lines
4.8 KiB
C
220 lines
4.8 KiB
C
/*
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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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#include <linux/fs.h>
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#include <linux/falloc.h>
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#include <linux/nfs_fs.h>
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#include "delegation.h"
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#include "internal.h"
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#include "iostat.h"
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#include "fscache.h"
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#include "pnfs.h"
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#include "nfstrace.h"
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#ifdef CONFIG_NFS_V4_2
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#include "nfs42.h"
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#endif
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#define NFSDBG_FACILITY NFSDBG_FILE
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static int
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nfs4_file_open(struct inode *inode, struct file *filp)
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{
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struct nfs_open_context *ctx;
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struct dentry *dentry = filp->f_path.dentry;
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struct dentry *parent = NULL;
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struct inode *dir;
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unsigned openflags = filp->f_flags;
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struct iattr attr;
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int err;
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/*
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* If no cached dentry exists or if it's negative, NFSv4 handled the
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* opens in ->lookup() or ->create().
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*
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* We only get this far for a cached positive dentry. We skipped
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* revalidation, so handle it here by dropping the dentry and returning
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* -EOPENSTALE. The VFS will retry the lookup/create/open.
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*/
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dprintk("NFS: open file(%pd2)\n", dentry);
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err = nfs_check_flags(openflags);
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if (err)
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return err;
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if ((openflags & O_ACCMODE) == 3)
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openflags--;
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/* We can't create new files here */
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openflags &= ~(O_CREAT|O_EXCL);
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parent = dget_parent(dentry);
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dir = d_inode(parent);
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ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
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err = PTR_ERR(ctx);
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if (IS_ERR(ctx))
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goto out;
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attr.ia_valid = ATTR_OPEN;
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if (openflags & O_TRUNC) {
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attr.ia_valid |= ATTR_SIZE;
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attr.ia_size = 0;
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nfs_sync_inode(inode);
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}
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inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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switch (err) {
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case -EPERM:
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case -EACCES:
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case -EDQUOT:
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case -ENOSPC:
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case -EROFS:
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goto out_put_ctx;
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default:
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goto out_drop;
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}
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}
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if (inode != d_inode(dentry))
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goto out_drop;
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nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
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nfs_file_set_open_context(filp, ctx);
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nfs_fscache_open_file(inode, filp);
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err = 0;
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out_put_ctx:
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put_nfs_open_context(ctx);
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out:
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dput(parent);
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return err;
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out_drop:
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d_drop(dentry);
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err = -EOPENSTALE;
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goto out_put_ctx;
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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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static int
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nfs4_file_flush(struct file *file, fl_owner_t id)
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{
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struct inode *inode = file_inode(file);
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dprintk("NFS: flush(%pD2)\n", file);
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nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
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if ((file->f_mode & FMODE_WRITE) == 0)
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return 0;
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/*
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* If we're holding a write delegation, then check if we're required
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* to flush the i/o on close. If not, then just start the i/o now.
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*/
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if (!nfs4_delegation_flush_on_close(inode))
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return filemap_fdatawrite(file->f_mapping);
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/* Flush writes to the server and return any errors */
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return vfs_fsync(file, 0);
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}
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static int
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nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
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{
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int ret;
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struct inode *inode = file_inode(file);
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trace_nfs_fsync_enter(inode);
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nfs_inode_dio_wait(inode);
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do {
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ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
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if (ret != 0)
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break;
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mutex_lock(&inode->i_mutex);
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ret = nfs_file_fsync_commit(file, start, end, datasync);
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if (!ret)
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ret = pnfs_sync_inode(inode, !!datasync);
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mutex_unlock(&inode->i_mutex);
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/*
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* If nfs_file_fsync_commit detected a server reboot, then
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* resend all dirty pages that might have been covered by
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* the NFS_CONTEXT_RESEND_WRITES flag
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*/
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start = 0;
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end = LLONG_MAX;
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} while (ret == -EAGAIN);
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trace_nfs_fsync_exit(inode, ret);
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return ret;
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}
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#ifdef CONFIG_NFS_V4_2
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static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
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{
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loff_t ret;
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switch (whence) {
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case SEEK_HOLE:
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case SEEK_DATA:
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ret = nfs42_proc_llseek(filep, offset, whence);
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if (ret != -ENOTSUPP)
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return ret;
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default:
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return nfs_file_llseek(filep, offset, whence);
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}
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}
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static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
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{
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struct inode *inode = file_inode(filep);
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long ret;
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if (!S_ISREG(inode->i_mode))
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return -EOPNOTSUPP;
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if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
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return -EOPNOTSUPP;
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ret = inode_newsize_ok(inode, offset + len);
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if (ret < 0)
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return ret;
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if (mode & FALLOC_FL_PUNCH_HOLE)
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return nfs42_proc_deallocate(filep, offset, len);
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return nfs42_proc_allocate(filep, offset, len);
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}
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#endif /* CONFIG_NFS_V4_2 */
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const struct file_operations nfs4_file_operations = {
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#ifdef CONFIG_NFS_V4_2
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.llseek = nfs4_file_llseek,
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#else
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.llseek = nfs_file_llseek,
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#endif
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.read_iter = nfs_file_read,
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.write_iter = nfs_file_write,
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.mmap = nfs_file_mmap,
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.open = nfs4_file_open,
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.flush = nfs4_file_flush,
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.release = nfs_file_release,
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.fsync = nfs4_file_fsync,
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.lock = nfs_lock,
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.flock = nfs_flock,
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.splice_read = nfs_file_splice_read,
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.splice_write = iter_file_splice_write,
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#ifdef CONFIG_NFS_V4_2
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.fallocate = nfs42_fallocate,
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#endif /* CONFIG_NFS_V4_2 */
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.check_flags = nfs_check_flags,
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.setlease = simple_nosetlease,
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};
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