mirror of https://gitee.com/openkylin/linux.git
138 lines
3.1 KiB
C
138 lines
3.1 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/nfs_fs.h>
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#include "internal.h"
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#include "fscache.h"
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#include "pnfs.h"
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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(%s/%s)\n",
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dentry->d_parent->d_name.name,
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dentry->d_name.name);
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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 = parent->d_inode;
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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_wb_all(inode);
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}
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inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr);
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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 != dentry->d_inode)
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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_set_inode_cookie(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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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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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 && !datasync)
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/* application has asked for meta-data sync */
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ret = pnfs_layoutcommit_inode(inode, true);
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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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return ret;
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}
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const struct file_operations nfs4_file_operations = {
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.llseek = nfs_file_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 = nfs4_file_open,
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.flush = nfs_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 = nfs_file_splice_write,
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.check_flags = nfs_check_flags,
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.setlease = nfs_setlease,
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};
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