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6237a17fb8
The delegated timestamp code seems to be working well enough now that we want to make it always be built in. In the event that there are problems though, we still want to be able to disable them for debugging purposes. Add a switch to debugfs to enable them at runtime. Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
148 lines
3.1 KiB
C
148 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/debugfs.h>
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#include "nfsd.h"
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static struct dentry *nfsd_top_dir __read_mostly;
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/*
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* /sys/kernel/debug/nfsd/disable-splice-read
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*
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* Contents:
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* %0: NFS READ is allowed to use page splicing
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* %1: NFS READ uses only iov iter read
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*
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* The default value of this setting is zero (page splicing is
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* allowed). This setting takes immediate effect for all NFS
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* versions, all exports, and in all NFSD net namespaces.
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*/
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static int nfsd_dsr_get(void *data, u64 *val)
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{
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*val = nfsd_disable_splice_read ? 1 : 0;
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return 0;
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}
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static int nfsd_dsr_set(void *data, u64 val)
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{
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nfsd_disable_splice_read = (val > 0);
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if (!nfsd_disable_splice_read) {
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/*
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* Must use buffered I/O if splice_read is enabled.
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*/
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nfsd_io_cache_read = NFSD_IO_BUFFERED;
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}
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return 0;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(nfsd_dsr_fops, nfsd_dsr_get, nfsd_dsr_set, "%llu\n");
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/*
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* /sys/kernel/debug/nfsd/io_cache_read
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*
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* Contents:
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* %0: NFS READ will use buffered IO
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* %1: NFS READ will use dontcache (buffered IO w/ dropbehind)
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* %2: NFS READ will use direct IO
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*
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* This setting takes immediate effect for all NFS versions,
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* all exports, and in all NFSD net namespaces.
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*/
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static int nfsd_io_cache_read_get(void *data, u64 *val)
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{
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*val = nfsd_io_cache_read;
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return 0;
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}
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static int nfsd_io_cache_read_set(void *data, u64 val)
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{
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int ret = 0;
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switch (val) {
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case NFSD_IO_BUFFERED:
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nfsd_io_cache_read = NFSD_IO_BUFFERED;
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break;
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case NFSD_IO_DONTCACHE:
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case NFSD_IO_DIRECT:
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/*
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* Must disable splice_read when enabling
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* NFSD_IO_DONTCACHE.
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*/
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nfsd_disable_splice_read = true;
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nfsd_io_cache_read = val;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(nfsd_io_cache_read_fops, nfsd_io_cache_read_get,
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nfsd_io_cache_read_set, "%llu\n");
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/*
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* /sys/kernel/debug/nfsd/io_cache_write
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*
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* Contents:
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* %0: NFS WRITE will use buffered IO
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* %1: NFS WRITE will use dontcache (buffered IO w/ dropbehind)
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*
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* This setting takes immediate effect for all NFS versions,
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* all exports, and in all NFSD net namespaces.
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*/
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static int nfsd_io_cache_write_get(void *data, u64 *val)
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{
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*val = nfsd_io_cache_write;
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return 0;
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}
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static int nfsd_io_cache_write_set(void *data, u64 val)
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{
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int ret = 0;
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switch (val) {
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case NFSD_IO_BUFFERED:
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case NFSD_IO_DONTCACHE:
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case NFSD_IO_DIRECT:
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nfsd_io_cache_write = val;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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DEFINE_DEBUGFS_ATTRIBUTE(nfsd_io_cache_write_fops, nfsd_io_cache_write_get,
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nfsd_io_cache_write_set, "%llu\n");
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void nfsd_debugfs_exit(void)
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{
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debugfs_remove_recursive(nfsd_top_dir);
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nfsd_top_dir = NULL;
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}
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void nfsd_debugfs_init(void)
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{
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nfsd_top_dir = debugfs_create_dir("nfsd", NULL);
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debugfs_create_file("disable-splice-read", S_IWUSR | S_IRUGO,
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nfsd_top_dir, NULL, &nfsd_dsr_fops);
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debugfs_create_file("io_cache_read", 0644, nfsd_top_dir, NULL,
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&nfsd_io_cache_read_fops);
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debugfs_create_file("io_cache_write", 0644, nfsd_top_dir, NULL,
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&nfsd_io_cache_write_fops);
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#ifdef CONFIG_NFSD_V4
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debugfs_create_bool("delegated_timestamps", 0644, nfsd_top_dir,
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&nfsd_delegts_enabled);
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#endif
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}
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