291 lines
7.1 KiB
C
291 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#include <linux/fs.h>
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#include <linux/file.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 = file_dentry(filp);
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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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return nfs_open(inode, filp);
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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(file_dentry(filp), filp->f_mode, filp);
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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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filemap_write_and_wait(inode->i_mapping);
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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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default:
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goto out_put_ctx;
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case -ENOENT:
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case -ESTALE:
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case -EISDIR:
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case -ENOTDIR:
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case -ELOOP:
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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 nfs_wb_all(inode);
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}
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#ifdef CONFIG_NFS_V4_2
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static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out,
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size_t count, unsigned int flags)
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{
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/* Only offload copy if superblock is the same */
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if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
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return -EXDEV;
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if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY))
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return -EOPNOTSUPP;
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if (file_inode(file_in) == file_inode(file_out))
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return -EOPNOTSUPP;
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return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
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}
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static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out,
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size_t count, unsigned int flags)
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{
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ssize_t ret;
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ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
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flags);
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if (ret == -EOPNOTSUPP || ret == -EXDEV)
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ret = generic_copy_file_range(file_in, pos_in, file_out,
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pos_out, count, flags);
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return ret;
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}
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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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/* Fall through */
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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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static loff_t nfs42_remap_file_range(struct file *src_file, loff_t src_off,
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struct file *dst_file, loff_t dst_off, loff_t count,
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unsigned int remap_flags)
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{
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struct inode *dst_inode = file_inode(dst_file);
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struct nfs_server *server = NFS_SERVER(dst_inode);
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struct inode *src_inode = file_inode(src_file);
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unsigned int bs = server->clone_blksize;
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bool same_inode = false;
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int ret;
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/* NFS does not support deduplication. */
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if (remap_flags & REMAP_FILE_DEDUP)
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return -EOPNOTSUPP;
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if (remap_flags & ~REMAP_FILE_ADVISORY)
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return -EINVAL;
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/* check alignment w.r.t. clone_blksize */
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ret = -EINVAL;
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if (bs) {
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if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
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goto out;
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if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
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goto out;
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}
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if (src_inode == dst_inode)
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same_inode = true;
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/* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
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if (same_inode) {
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inode_lock(src_inode);
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} else if (dst_inode < src_inode) {
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inode_lock_nested(dst_inode, I_MUTEX_PARENT);
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inode_lock_nested(src_inode, I_MUTEX_CHILD);
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} else {
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inode_lock_nested(src_inode, I_MUTEX_PARENT);
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inode_lock_nested(dst_inode, I_MUTEX_CHILD);
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}
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/* flush all pending writes on both src and dst so that server
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* has the latest data */
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ret = nfs_sync_inode(src_inode);
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if (ret)
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goto out_unlock;
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ret = nfs_sync_inode(dst_inode);
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if (ret)
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goto out_unlock;
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ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
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/* truncate inode page cache of the dst range so that future reads can fetch
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* new data from server */
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if (!ret)
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truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
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out_unlock:
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if (same_inode) {
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inode_unlock(src_inode);
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} else if (dst_inode < src_inode) {
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inode_unlock(src_inode);
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inode_unlock(dst_inode);
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} else {
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inode_unlock(dst_inode);
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inode_unlock(src_inode);
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}
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out:
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return ret < 0 ? ret : count;
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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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.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 = nfs_file_fsync,
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.lock = nfs_lock,
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.flock = nfs_flock,
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.splice_read = generic_file_splice_read,
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.splice_write = iter_file_splice_write,
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.check_flags = nfs_check_flags,
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.setlease = simple_nosetlease,
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#ifdef CONFIG_NFS_V4_2
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.copy_file_range = nfs4_copy_file_range,
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.llseek = nfs4_file_llseek,
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.fallocate = nfs42_fallocate,
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.remap_file_range = nfs42_remap_file_range,
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#else
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.llseek = nfs_file_llseek,
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#endif
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};
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