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05990d1bf2
If the server reboots before it can commit the unstable writes to disk, then nfs_commit_release_pages() will detect this when it compares the verifier returned by COMMIT to the one returned by WRITE. When this happens, the client needs to resend those writes in order to guarantee that they make it to stable storage. This patch adds a signalling mechanism to notify fsync() that it needs to retry all writes before it can exit. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
130 lines
2.9 KiB
C
130 lines
2.9 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 "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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BUG_ON(inode != dentry->d_inode);
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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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iput(inode);
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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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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->f_path.dentry->d_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 && !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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} 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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