Merge tag 'nfsd-5.4' of git://linux-nfs.org/~bfields/linux
Merge commit. Changes below are compared with the first parent: 8f744bde.
Changes
40 files changed · +2083 −600
Only the first 600 diff lines are shown. Download the complete patch.
fs/file_table.c
View filediff --git a/fs/file_table.c b/fs/file_table.c
index b07b53f..30d55c9 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -327,6 +327,7 @@ void flush_delayed_fput(void)
{
delayed_fput(NULL);
}
+EXPORT_SYMBOL_GPL(flush_delayed_fput);
static DECLARE_DELAYED_WORK(delayed_fput_work, delayed_fput);
fs/locks.c
View filediff --git a/fs/locks.c b/fs/locks.c
index a364ebc..6970f55 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -212,6 +212,7 @@ struct file_lock_list_struct {
static DEFINE_PER_CPU(struct file_lock_list_struct, file_lock_list);
DEFINE_STATIC_PERCPU_RWSEM(file_rwsem);
+
/*
* The blocked_hash is used to find POSIX lock loops for deadlock detection.
* It is protected by blocked_lock_lock.
@@ -1991,6 +1992,64 @@ int generic_setlease(struct file *filp, long arg, struct file_lock **flp,
}
EXPORT_SYMBOL(generic_setlease);
+#if IS_ENABLED(CONFIG_SRCU)
+/*
+ * Kernel subsystems can register to be notified on any attempt to set
+ * a new lease with the lease_notifier_chain. This is used by (e.g.) nfsd
+ * to close files that it may have cached when there is an attempt to set a
+ * conflicting lease.
+ */
+static struct srcu_notifier_head lease_notifier_chain;
+
+static inline void
+lease_notifier_chain_init(void)
+{
+ srcu_init_notifier_head(&lease_notifier_chain);
+}
+
+static inline void
+setlease_notifier(long arg, struct file_lock *lease)
+{
+ if (arg != F_UNLCK)
+ srcu_notifier_call_chain(&lease_notifier_chain, arg, lease);
+}
+
+int lease_register_notifier(struct notifier_block *nb)
+{
+ return srcu_notifier_chain_register(&lease_notifier_chain, nb);
+}
+EXPORT_SYMBOL_GPL(lease_register_notifier);
+
+void lease_unregister_notifier(struct notifier_block *nb)
+{
+ srcu_notifier_chain_unregister(&lease_notifier_chain, nb);
+}
+EXPORT_SYMBOL_GPL(lease_unregister_notifier);
+
+#else /* !IS_ENABLED(CONFIG_SRCU) */
+static inline void
+lease_notifier_chain_init(void)
+{
+}
+
+static inline void
+setlease_notifier(long arg, struct file_lock *lease)
+{
+}
+
+int lease_register_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+EXPORT_SYMBOL_GPL(lease_register_notifier);
+
+void lease_unregister_notifier(struct notifier_block *nb)
+{
+}
+EXPORT_SYMBOL_GPL(lease_unregister_notifier);
+
+#endif /* IS_ENABLED(CONFIG_SRCU) */
+
/**
* vfs_setlease - sets a lease on an open file
* @filp: file pointer
@@ -2011,6 +2070,8 @@ EXPORT_SYMBOL(generic_setlease);
int
vfs_setlease(struct file *filp, long arg, struct file_lock **lease, void **priv)
{
+ if (lease)
+ setlease_notifier(arg, *lease);
if (filp->f_op->setlease)
return filp->f_op->setlease(filp, arg, lease, priv);
else
@@ -2924,6 +2985,7 @@ static int __init filelock_init(void)
INIT_HLIST_HEAD(&fll->hlist);
}
+ lease_notifier_chain_init();
return 0;
}
core_initcall(filelock_init);
fs/nfsd/Kconfig
View filediff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig
index d25f6bb..10cefb0 100644
--- a/fs/nfsd/Kconfig
+++ b/fs/nfsd/Kconfig
@@ -3,6 +3,7 @@ config NFSD
tristate "NFS server support"
depends on INET
depends on FILE_LOCKING
+ depends on FSNOTIFY
select LOCKD
select SUNRPC
select EXPORTFS
@@ -147,7 +148,7 @@ config NFSD_V4_SECURITY_LABEL
config NFSD_FAULT_INJECTION
bool "NFS server manual fault injection"
- depends on NFSD_V4 && DEBUG_KERNEL && DEBUG_FS
+ depends on NFSD_V4 && DEBUG_KERNEL && DEBUG_FS && BROKEN
help
This option enables support for manually injecting faults
into the NFS server. This is intended to be used for
fs/nfsd/Makefile
View filediff --git a/fs/nfsd/Makefile b/fs/nfsd/Makefile
index 2bfb58e..6a40b1a 100644
--- a/fs/nfsd/Makefile
+++ b/fs/nfsd/Makefile
@@ -11,7 +11,8 @@ obj-$(CONFIG_NFSD) += nfsd.o
nfsd-y += trace.o
nfsd-y += nfssvc.o nfsctl.o nfsproc.o nfsfh.o vfs.o \
- export.o auth.o lockd.o nfscache.o nfsxdr.o stats.o
+ export.o auth.o lockd.o nfscache.o nfsxdr.o \
+ stats.o filecache.o
nfsd-$(CONFIG_NFSD_FAULT_INJECTION) += fault_inject.o
nfsd-$(CONFIG_NFSD_V2_ACL) += nfs2acl.o
nfsd-$(CONFIG_NFSD_V3) += nfs3proc.o nfs3xdr.o
fs/nfsd/acl.h
View filediff --git a/fs/nfsd/acl.h b/fs/nfsd/acl.h
index 4cd7c69..ba14d2f 100644
--- a/fs/nfsd/acl.h
+++ b/fs/nfsd/acl.h
@@ -39,14 +39,6 @@ struct nfs4_acl;
struct svc_fh;
struct svc_rqst;
-/*
- * Maximum ACL we'll accept from a client; chosen (somewhat
- * arbitrarily) so that kmalloc'ing the ACL shouldn't require a
- * high-order allocation. This allows 204 ACEs on x86_64:
- */
-#define NFS4_ACL_MAX ((PAGE_SIZE - sizeof(struct nfs4_acl)) \
- / sizeof(struct nfs4_ace))
-
int nfs4_acl_bytes(int entries);
int nfs4_acl_get_whotype(char *, u32);
__be32 nfs4_acl_write_who(struct xdr_stream *xdr, int who);
fs/nfsd/blocklayout.c
View filediff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
index 66d4c55..9bbaa67 100644
--- a/fs/nfsd/blocklayout.c
+++ b/fs/nfsd/blocklayout.c
@@ -15,6 +15,7 @@
#include "blocklayoutxdr.h"
#include "pnfs.h"
+#include "filecache.h"
#define NFSDDBG_FACILITY NFSDDBG_PNFS
@@ -404,7 +405,7 @@ static void
nfsd4_scsi_fence_client(struct nfs4_layout_stateid *ls)
{
struct nfs4_client *clp = ls->ls_stid.sc_client;
- struct block_device *bdev = ls->ls_file->f_path.mnt->mnt_sb->s_bdev;
+ struct block_device *bdev = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_bdev;
bdev->bd_disk->fops->pr_ops->pr_preempt(bdev, NFSD_MDS_PR_KEY,
nfsd4_scsi_pr_key(clp), 0, true);
fs/nfsd/export.c
View filediff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index baa0195..15422c9 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -22,6 +22,7 @@
#include "nfsfh.h"
#include "netns.h"
#include "pnfs.h"
+#include "filecache.h"
#define NFSDDBG_FACILITY NFSDDBG_EXPORT
@@ -232,6 +233,17 @@ static struct cache_head *expkey_alloc(void)
return NULL;
}
+static void expkey_flush(void)
+{
+ /*
+ * Take the nfsd_mutex here to ensure that the file cache is not
+ * destroyed while we're in the middle of flushing.
+ */
+ mutex_lock(&nfsd_mutex);
+ nfsd_file_cache_purge(current->nsproxy->net_ns);
+ mutex_unlock(&nfsd_mutex);
+}
+
static const struct cache_detail svc_expkey_cache_template = {
.owner = THIS_MODULE,
.hash_size = EXPKEY_HASHMAX,
@@ -244,6 +256,7 @@ static const struct cache_detail svc_expkey_cache_template = {
.init = expkey_init,
.update = expkey_update,
.alloc = expkey_alloc,
+ .flush = expkey_flush,
};
static int
fs/nfsd/filecache.c
View filediff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
new file mode 100644
index 0000000..ef55e9b
--- /dev/null
+++ b/fs/nfsd/filecache.c
@@ -0,0 +1,934 @@
+/*
+ * Open file cache.
+ *
+ * (c) 2015 - Jeff Layton <[email protected]>
+ */
+
+#include <linux/hash.h>
+#include <linux/slab.h>
+#include <linux/file.h>
+#include <linux/sched.h>
+#include <linux/list_lru.h>
+#include <linux/fsnotify_backend.h>
+#include <linux/fsnotify.h>
+#include <linux/seq_file.h>
+
+#include "vfs.h"
+#include "nfsd.h"
+#include "nfsfh.h"
+#include "netns.h"
+#include "filecache.h"
+#include "trace.h"
+
+#define NFSDDBG_FACILITY NFSDDBG_FH
+
+/* FIXME: dynamically size this for the machine somehow? */
+#define NFSD_FILE_HASH_BITS 12
+#define NFSD_FILE_HASH_SIZE (1 << NFSD_FILE_HASH_BITS)
+#define NFSD_LAUNDRETTE_DELAY (2 * HZ)
+
+#define NFSD_FILE_LRU_RESCAN (0)
+#define NFSD_FILE_SHUTDOWN (1)
+#define NFSD_FILE_LRU_THRESHOLD (4096UL)
+#define NFSD_FILE_LRU_LIMIT (NFSD_FILE_LRU_THRESHOLD << 2)
+
+/* We only care about NFSD_MAY_READ/WRITE for this cache */
+#define NFSD_FILE_MAY_MASK (NFSD_MAY_READ|NFSD_MAY_WRITE)
+
+struct nfsd_fcache_bucket {
+ struct hlist_head nfb_head;
+ spinlock_t nfb_lock;
+ unsigned int nfb_count;
+ unsigned int nfb_maxcount;
+};
+
+static DEFINE_PER_CPU(unsigned long, nfsd_file_cache_hits);
+
+static struct kmem_cache *nfsd_file_slab;
+static struct kmem_cache *nfsd_file_mark_slab;
+static struct nfsd_fcache_bucket *nfsd_file_hashtbl;
+static struct list_lru nfsd_file_lru;
+static long nfsd_file_lru_flags;
+static struct fsnotify_group *nfsd_file_fsnotify_group;
+static atomic_long_t nfsd_filecache_count;
+static struct delayed_work nfsd_filecache_laundrette;
+
+enum nfsd_file_laundrette_ctl {
+ NFSD_FILE_LAUNDRETTE_NOFLUSH = 0,
+ NFSD_FILE_LAUNDRETTE_MAY_FLUSH
+};
+
+static void
+nfsd_file_schedule_laundrette(enum nfsd_file_laundrette_ctl ctl)
+{
+ long count = atomic_long_read(&nfsd_filecache_count);
+
+ if (count == 0 || test_bit(NFSD_FILE_SHUTDOWN, &nfsd_file_lru_flags))
+ return;
+
+ /* Be more aggressive about scanning if over the threshold */
+ if (count > NFSD_FILE_LRU_THRESHOLD)
+ mod_delayed_work(system_wq, &nfsd_filecache_laundrette, 0);
+ else
+ schedule_delayed_work(&nfsd_filecache_laundrette, NFSD_LAUNDRETTE_DELAY);
+
+ if (ctl == NFSD_FILE_LAUNDRETTE_NOFLUSH)
+ return;
+
+ /* ...and don't delay flushing if we're out of control */
+ if (count >= NFSD_FILE_LRU_LIMIT)
+ flush_delayed_work(&nfsd_filecache_laundrette);
+}
+
+static void
+nfsd_file_slab_free(struct rcu_head *rcu)
+{
+ struct nfsd_file *nf = container_of(rcu, struct nfsd_file, nf_rcu);
+
+ put_cred(nf->nf_cred);
+ kmem_cache_free(nfsd_file_slab, nf);
+}
+
+static void
+nfsd_file_mark_free(struct fsnotify_mark *mark)
+{
+ struct nfsd_file_mark *nfm = container_of(mark, struct nfsd_file_mark,
+ nfm_mark);
+
+ kmem_cache_free(nfsd_file_mark_slab, nfm);
+}
+
+static struct nfsd_file_mark *
+nfsd_file_mark_get(struct nfsd_file_mark *nfm)
+{
+ if (!atomic_inc_not_zero(&nfm->nfm_ref))
+ return NULL;
+ return nfm;
+}
+
+static void
+nfsd_file_mark_put(struct nfsd_file_mark *nfm)
+{
+ if (atomic_dec_and_test(&nfm->nfm_ref)) {
+
+ fsnotify_destroy_mark(&nfm->nfm_mark, nfsd_file_fsnotify_group);
+ fsnotify_put_mark(&nfm->nfm_mark);
+ }
+}
+
+static struct nfsd_file_mark *
+nfsd_file_mark_find_or_create(struct nfsd_file *nf)
+{
+ int err;
+ struct fsnotify_mark *mark;
+ struct nfsd_file_mark *nfm = NULL, *new;
+ struct inode *inode = nf->nf_inode;
+
+ do {
+ mutex_lock(&nfsd_file_fsnotify_group->mark_mutex);
+ mark = fsnotify_find_mark(&inode->i_fsnotify_marks,
+ nfsd_file_fsnotify_group);
+ if (mark) {
+ nfm = nfsd_file_mark_get(container_of(mark,
+ struct nfsd_file_mark,
+ nfm_mark));
+ mutex_unlock(&nfsd_file_fsnotify_group->mark_mutex);
+ fsnotify_put_mark(mark);
+ if (likely(nfm))
+ break;
+ } else
+ mutex_unlock(&nfsd_file_fsnotify_group->mark_mutex);
+
+ /* allocate a new nfm */
+ new = kmem_cache_alloc(nfsd_file_mark_slab, GFP_KERNEL);
+ if (!new)
+ return NULL;
+ fsnotify_init_mark(&new->nfm_mark, nfsd_file_fsnotify_group);
+ new->nfm_mark.mask = FS_ATTRIB|FS_DELETE_SELF;
+ atomic_set(&new->nfm_ref, 1);
+
+ err = fsnotify_add_inode_mark(&new->nfm_mark, inode, 0);
+
+ /*
+ * If the add was successful, then return the object.
+ * Otherwise, we need to put the reference we hold on the
+ * nfm_mark. The fsnotify code will take a reference and put
+ * it on failure, so we can't just free it directly. It's also
+ * not safe to call fsnotify_destroy_mark on it as the
+ * mark->group will be NULL. Thus, we can't let the nfm_ref
+ * counter drive the destruction at this point.
+ */
+ if (likely(!err))
+ nfm = new;
+ else
+ fsnotify_put_mark(&new->nfm_mark);
+ } while (unlikely(err == -EEXIST));
+
+ return nfm;
+}
+
+static struct nfsd_file *
+nfsd_file_alloc(struct inode *inode, unsigned int may, unsigned int hashval,
+ struct net *net)
+{
+ struct nfsd_file *nf;
+
+ nf = kmem_cache_alloc(nfsd_file_slab, GFP_KERNEL);
+ if (nf) {
+ INIT_HLIST_NODE(&nf->nf_node);
+ INIT_LIST_HEAD(&nf->nf_lru);
+ nf->nf_file = NULL;
+ nf->nf_cred = get_current_cred();
+ nf->nf_net = net;
+ nf->nf_flags = 0;
+ nf->nf_inode = inode;
+ nf->nf_hashval = hashval;
+ atomic_set(&nf->nf_ref, 1);
+ nf->nf_may = may & NFSD_FILE_MAY_MASK;
+ if (may & NFSD_MAY_NOT_BREAK_LEASE) {
+ if (may & NFSD_MAY_WRITE)
+ __set_bit(NFSD_FILE_BREAK_WRITE, &nf->nf_flags);
+ if (may & NFSD_MAY_READ)
+ __set_bit(NFSD_FILE_BREAK_READ, &nf->nf_flags);
+ }
+ nf->nf_mark = NULL;
+ trace_nfsd_file_alloc(nf);
+ }
+ return nf;
+}
+
+static bool
+nfsd_file_free(struct nfsd_file *nf)
+{
+ bool flush = false;
+
+ trace_nfsd_file_put_final(nf);
+ if (nf->nf_mark)
+ nfsd_file_mark_put(nf->nf_mark);
+ if (nf->nf_file) {
+ get_file(nf->nf_file);
+ filp_close(nf->nf_file, NULL);
+ fput(nf->nf_file);
+ flush = true;
+ }
+ call_rcu(&nf->nf_rcu, nfsd_file_slab_free);
+ return flush;
+}
+
+static bool
+nfsd_file_check_writeback(struct nfsd_file *nf)
+{
+ struct file *file = nf->nf_file;
+ struct address_space *mapping;
+
+ if (!file || !(file->f_mode & FMODE_WRITE))
+ return false;
+ mapping = file->f_mapping;
+ return mapping_tagged(mapping, PAGECACHE_TAG_DIRTY) ||
+ mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK);
+}
+
+static int
+nfsd_file_check_write_error(struct nfsd_file *nf)
+{
+ struct file *file = nf->nf_file;
+
+ if (!file || !(file->f_mode & FMODE_WRITE))
+ return 0;
+ return filemap_check_wb_err(file->f_mapping, READ_ONCE(file->f_wb_err));
+}
+
+static bool
+nfsd_file_in_use(struct nfsd_file *nf)
+{
+ return nfsd_file_check_writeback(nf) ||
+ nfsd_file_check_write_error(nf);
+}
+
+static void
+nfsd_file_do_unhash(struct nfsd_file *nf)
+{
+ lockdep_assert_held(&nfsd_file_hashtbl[nf->nf_hashval].nfb_lock);
+
+ trace_nfsd_file_unhash(nf);
+
+ if (nfsd_file_check_write_error(nf))
+ nfsd_reset_boot_verifier(net_generic(nf->nf_net, nfsd_net_id));
+ --nfsd_file_hashtbl[nf->nf_hashval].nfb_count;
+ hlist_del_rcu(&nf->nf_node);
+ if (!list_empty(&nf->nf_lru))
+ list_lru_del(&nfsd_file_lru, &nf->nf_lru);
+ atomic_long_dec(&nfsd_filecache_count);
+}
+
+static bool
+nfsd_file_unhash(struct nfsd_file *nf)
+{
+ if (test_and_clear_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
+ nfsd_file_do_unhash(nf);
+ return true;
+ }
+ return false;
+}
+
+/*
+ * Return true if the file was unhashed.
+ */
+static bool
+nfsd_file_unhash_and_release_locked(struct nfsd_file *nf, struct list_head *dispose)
+{
+ lockdep_assert_held(&nfsd_file_hashtbl[nf->nf_hashval].nfb_lock);
+
+ trace_nfsd_file_unhash_and_release_locked(nf);
+ if (!nfsd_file_unhash(nf))
+ return false;
+ /* keep final reference for nfsd_file_lru_dispose */
+ if (atomic_add_unless(&nf->nf_ref, -1, 1))
+ return true;
+
+ list_add(&nf->nf_lru, dispose);
+ return true;
+}
+
+static int
+nfsd_file_put_noref(struct nfsd_file *nf)
+{
+ int count;
+ trace_nfsd_file_put(nf);
+
+ count = atomic_dec_return(&nf->nf_ref);
+ if (!count) {
+ WARN_ON(test_bit(NFSD_FILE_HASHED, &nf->nf_flags));
+ nfsd_file_free(nf);
+ }
+ return count;
+}
+
+void
+nfsd_file_put(struct nfsd_file *nf)
+{
+ bool is_hashed = test_bit(NFSD_FILE_HASHED, &nf->nf_flags) != 0;
+ bool unused = !nfsd_file_in_use(nf);
+
+ set_bit(NFSD_FILE_REFERENCED, &nf->nf_flags);
+ if (nfsd_file_put_noref(nf) == 1 && is_hashed && unused)
+ nfsd_file_schedule_laundrette(NFSD_FILE_LAUNDRETTE_MAY_FLUSH);
+}
+
+struct nfsd_file *
+nfsd_file_get(struct nfsd_file *nf)
+{
+ if (likely(atomic_inc_not_zero(&nf->nf_ref)))
+ return nf;
+ return NULL;
+}
+
+static void
+nfsd_file_dispose_list(struct list_head *dispose)
+{
+ struct nfsd_file *nf;
+
+ while(!list_empty(dispose)) {
+ nf = list_first_entry(dispose, struct nfsd_file, nf_lru);
+ list_del(&nf->nf_lru);
+ nfsd_file_put_noref(nf);
+ }
+}
+
+static void
+nfsd_file_dispose_list_sync(struct list_head *dispose)
+{
+ bool flush = false;
+ struct nfsd_file *nf;
+
+ while(!list_empty(dispose)) {
+ nf = list_first_entry(dispose, struct nfsd_file, nf_lru);
+ list_del(&nf->nf_lru);
+ if (!atomic_dec_and_test(&nf->nf_ref))
+ continue;
+ if (nfsd_file_free(nf))
+ flush = true;
+ }
+ if (flush)
+ flush_delayed_fput();
+}
+
+/*
+ * Note this can deadlock with nfsd_file_cache_purge.
+ */
+static enum lru_status
+nfsd_file_lru_cb(struct list_head *item, struct list_lru_one *lru,
+ spinlock_t *lock, void *arg)
+ __releases(lock)
+ __acquires(lock)
+{
+ struct list_head *head = arg;
+ struct nfsd_file *nf = list_entry(item, struct nfsd_file, nf_lru);
+
+ /*
+ * Do a lockless refcount check. The hashtable holds one reference, so
+ * we look to see if anything else has a reference, or if any have
+ * been put since the shrinker last ran. Those don't get unhashed and
+ * released.
+ *
+ * Note that in the put path, we set the flag and then decrement the
+ * counter. Here we check the counter and then test and clear the flag.
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fs/nfsd/filecache.h
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fs/nfsd/netns.h
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fs/nfsd/nfs3proc.c
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fs/nfsd/nfs3xdr.c
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fs/nfsd/nfs4callback.c
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fs/nfsd/nfs4layouts.c
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fs/nfsd/nfs4proc.c
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fs/nfsd/nfs4recover.c
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fs/nfsd/nfs4state.c
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fs/nfsd/nfs4xdr.c
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fs/nfsd/nfsctl.c
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fs/nfsd/nfsproc.c
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fs/nfsd/nfssvc.c
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fs/nfsd/state.h
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fs/nfsd/trace.h
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fs/nfsd/vfs.c
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fs/nfsd/vfs.h
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fs/nfsd/xdr3.h
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fs/nfsd/xdr4.h
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fs/notify/fsnotify.h
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fs/notify/group.c
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fs/notify/mark.c
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include/linux/fs.h
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include/linux/fsnotify_backend.h
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include/linux/sunrpc/cache.h
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include/linux/sunrpc/svc_rdma.h
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include/uapi/linux/nfsd/cld.h
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net/sunrpc/cache.c
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net/sunrpc/svc.c
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net/sunrpc/xprtrdma/svc_rdma.c
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net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
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net/sunrpc/xprtrdma/svc_rdma_transport.c
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