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464 lines
11 KiB
464 lines
11 KiB
// 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/mount.h> |
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#include <linux/nfs_fs.h> |
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#include <linux/nfs_ssc.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_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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errseq_t since; |
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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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since = filemap_sample_wb_err(file->f_mapping); |
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nfs_wb_all(inode); |
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return filemap_check_wb_err(file->f_mapping, since); |
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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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struct nfs42_copy_notify_res *cn_resp = NULL; |
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struct nl4_server *nss = NULL; |
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nfs4_stateid *cnrs = NULL; |
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ssize_t ret; |
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bool sync = false; |
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/* Only offload copy if superblock is the same */ |
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if (file_in->f_op != &nfs4_file_operations) |
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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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!nfs_server_capable(file_inode(file_in), 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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/* if the copy size if smaller than 2 RPC payloads, make it |
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* synchronous |
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*/ |
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if (count <= 2 * NFS_SERVER(file_inode(file_in))->rsize) |
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sync = true; |
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retry: |
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if (!nfs42_files_from_same_server(file_in, file_out)) { |
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/* for inter copy, if copy size if smaller than 12 RPC |
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* payloads, fallback to traditional copy. There are |
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* 14 RPCs during an NFSv4.x mount between source/dest |
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* servers. |
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*/ |
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if (sync || |
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count <= 14 * NFS_SERVER(file_inode(file_in))->rsize) |
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return -EOPNOTSUPP; |
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cn_resp = kzalloc(sizeof(struct nfs42_copy_notify_res), |
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GFP_NOFS); |
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if (unlikely(cn_resp == NULL)) |
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return -ENOMEM; |
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ret = nfs42_proc_copy_notify(file_in, file_out, cn_resp); |
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if (ret) { |
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ret = -EOPNOTSUPP; |
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goto out; |
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} |
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nss = &cn_resp->cnr_src; |
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cnrs = &cn_resp->cnr_stateid; |
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} |
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ret = nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count, |
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nss, cnrs, sync); |
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out: |
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if (!nfs42_files_from_same_server(file_in, file_out)) |
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kfree(cn_resp); |
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if (ret == -EAGAIN) |
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goto retry; |
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return ret; |
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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 != -EOPNOTSUPP) |
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return ret; |
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fallthrough; |
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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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if (IS_SWAPFILE(dst_inode) || IS_SWAPFILE(src_inode)) |
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return -ETXTBSY; |
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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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static int read_name_gen = 1; |
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#define SSC_READ_NAME_BODY "ssc_read_%d" |
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static struct file *__nfs42_ssc_open(struct vfsmount *ss_mnt, |
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struct nfs_fh *src_fh, nfs4_stateid *stateid) |
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{ |
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struct nfs_fattr fattr; |
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struct file *filep, *res; |
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struct nfs_server *server; |
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struct inode *r_ino = NULL; |
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struct nfs_open_context *ctx; |
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struct nfs4_state_owner *sp; |
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char *read_name = NULL; |
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int len, status = 0; |
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server = NFS_SERVER(ss_mnt->mnt_root->d_inode); |
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nfs_fattr_init(&fattr); |
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status = nfs4_proc_getattr(server, src_fh, &fattr, NULL, NULL); |
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if (status < 0) { |
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res = ERR_PTR(status); |
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goto out; |
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} |
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res = ERR_PTR(-ENOMEM); |
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len = strlen(SSC_READ_NAME_BODY) + 16; |
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read_name = kzalloc(len, GFP_NOFS); |
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if (read_name == NULL) |
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goto out; |
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snprintf(read_name, len, SSC_READ_NAME_BODY, read_name_gen++); |
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r_ino = nfs_fhget(ss_mnt->mnt_root->d_inode->i_sb, src_fh, &fattr, |
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NULL); |
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if (IS_ERR(r_ino)) { |
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res = ERR_CAST(r_ino); |
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goto out_free_name; |
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} |
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filep = alloc_file_pseudo(r_ino, ss_mnt, read_name, FMODE_READ, |
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r_ino->i_fop); |
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if (IS_ERR(filep)) { |
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res = ERR_CAST(filep); |
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goto out_free_name; |
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} |
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filep->f_mode |= FMODE_READ; |
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ctx = alloc_nfs_open_context(filep->f_path.dentry, filep->f_mode, |
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filep); |
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if (IS_ERR(ctx)) { |
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res = ERR_CAST(ctx); |
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goto out_filep; |
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} |
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res = ERR_PTR(-EINVAL); |
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sp = nfs4_get_state_owner(server, ctx->cred, GFP_KERNEL); |
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if (sp == NULL) |
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goto out_ctx; |
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ctx->state = nfs4_get_open_state(r_ino, sp); |
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if (ctx->state == NULL) |
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goto out_stateowner; |
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set_bit(NFS_SRV_SSC_COPY_STATE, &ctx->state->flags); |
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memcpy(&ctx->state->open_stateid.other, &stateid->other, |
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NFS4_STATEID_OTHER_SIZE); |
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update_open_stateid(ctx->state, stateid, NULL, filep->f_mode); |
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set_bit(NFS_OPEN_STATE, &ctx->state->flags); |
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nfs_file_set_open_context(filep, ctx); |
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put_nfs_open_context(ctx); |
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file_ra_state_init(&filep->f_ra, filep->f_mapping->host->i_mapping); |
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res = filep; |
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out_free_name: |
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kfree(read_name); |
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out: |
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return res; |
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out_stateowner: |
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nfs4_put_state_owner(sp); |
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out_ctx: |
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put_nfs_open_context(ctx); |
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out_filep: |
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fput(filep); |
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goto out_free_name; |
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} |
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static void __nfs42_ssc_close(struct file *filep) |
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{ |
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struct nfs_open_context *ctx = nfs_file_open_context(filep); |
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ctx->state->flags = 0; |
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} |
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static const struct nfs4_ssc_client_ops nfs4_ssc_clnt_ops_tbl = { |
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.sco_open = __nfs42_ssc_open, |
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.sco_close = __nfs42_ssc_close, |
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}; |
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/** |
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* nfs42_ssc_register_ops - Wrapper to register NFS_V4 ops in nfs_common |
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* |
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* Return values: |
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* None |
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*/ |
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void nfs42_ssc_register_ops(void) |
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{ |
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#ifdef CONFIG_NFSD_V4 |
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nfs42_ssc_register(&nfs4_ssc_clnt_ops_tbl); |
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#endif |
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} |
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/** |
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* nfs42_ssc_unregister_ops - wrapper to un-register NFS_V4 ops in nfs_common |
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* |
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* Return values: |
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* None. |
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*/ |
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void nfs42_ssc_unregister_ops(void) |
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{ |
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#ifdef CONFIG_NFSD_V4 |
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nfs42_ssc_unregister(&nfs4_ssc_clnt_ops_tbl); |
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#endif |
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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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