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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/debugfs.h>
#include "nfsd.h"
static struct dentry *nfsd_top_dir __read_mostly;
/* * /sys/kernel/debug/nfsd/disable-splice-read * * Contents: * %0: NFS READ is allowed to use page splicing * %1: NFS READ uses only iov iter read * * The default value of this setting is zero (page splicing is * allowed). This setting takes immediate effect for all NFS * versions, all exports, and in all NFSD net namespaces. */
static int nfsd_dsr_get(void *data, u64 *val){ *val = nfsd_disable_splice_read ? 1 : 0; return 0;}
static int nfsd_dsr_set(void *data, u64 val){ nfsd_disable_splice_read = (val > 0); if (!nfsd_disable_splice_read) { /* * Must use buffered I/O if splice_read is enabled. */ nfsd_io_cache_read = NFSD_IO_BUFFERED; } return 0;}
DEFINE_DEBUGFS_ATTRIBUTE(nfsd_dsr_fops, nfsd_dsr_get, nfsd_dsr_set, "%llu\n");
/* * /sys/kernel/debug/nfsd/io_cache_read * * Contents: * %0: NFS READ will use buffered IO * %1: NFS READ will use dontcache (buffered IO w/ dropbehind) * %2: NFS READ will use direct IO * * This setting takes immediate effect for all NFS versions, * all exports, and in all NFSD net namespaces. */
static int nfsd_io_cache_read_get(void *data, u64 *val){ *val = nfsd_io_cache_read; return 0;}
static int nfsd_io_cache_read_set(void *data, u64 val){ int ret = 0;
switch (val) { case NFSD_IO_BUFFERED: nfsd_io_cache_read = NFSD_IO_BUFFERED; break; case NFSD_IO_DONTCACHE: case NFSD_IO_DIRECT: /* * Must disable splice_read when enabling * NFSD_IO_DONTCACHE. */ nfsd_disable_splice_read = true; nfsd_io_cache_read = val; break; default: ret = -EINVAL; break; }
return ret;}
DEFINE_DEBUGFS_ATTRIBUTE(nfsd_io_cache_read_fops, nfsd_io_cache_read_get, nfsd_io_cache_read_set, "%llu\n");
/* * /sys/kernel/debug/nfsd/io_cache_write * * Contents: * %0: NFS WRITE will use buffered IO * %1: NFS WRITE will use dontcache (buffered IO w/ dropbehind) * * This setting takes immediate effect for all NFS versions, * all exports, and in all NFSD net namespaces. */
static int nfsd_io_cache_write_get(void *data, u64 *val){ *val = nfsd_io_cache_write; return 0;}
static int nfsd_io_cache_write_set(void *data, u64 val){ int ret = 0;
switch (val) { case NFSD_IO_BUFFERED: case NFSD_IO_DONTCACHE: case NFSD_IO_DIRECT: nfsd_io_cache_write = val; break; default: ret = -EINVAL; break; }
return ret;}
DEFINE_DEBUGFS_ATTRIBUTE(nfsd_io_cache_write_fops, nfsd_io_cache_write_get, nfsd_io_cache_write_set, "%llu\n");
void nfsd_debugfs_exit(void){ debugfs_remove_recursive(nfsd_top_dir); nfsd_top_dir = NULL;}
void nfsd_debugfs_init(void){ nfsd_top_dir = debugfs_create_dir("nfsd", NULL);
debugfs_create_file("disable-splice-read", S_IWUSR | S_IRUGO, nfsd_top_dir, NULL, &nfsd_dsr_fops);
debugfs_create_file("io_cache_read", 0644, nfsd_top_dir, NULL, &nfsd_io_cache_read_fops);
debugfs_create_file("io_cache_write", 0644, nfsd_top_dir, NULL, &nfsd_io_cache_write_fops);#ifdef CONFIG_NFSD_V4 debugfs_create_bool("delegated_timestamps", 0644, nfsd_top_dir, &nfsd_delegts_enabled);#endif}