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authorKirill Tkhai <ktkhai@virtuozzo.com>2018-11-09 13:33:17 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2019-02-13 13:15:13 +0100
commit4510d86fbbb36872224482bb21836d47cce8be8c (patch)
treed4340b770fd1f73d14c5391f407b50b00b946f2b /fs
parentebf84d0c7220c7c9b904c405e61175d2a50cfb39 (diff)
downloadlinux-4510d86fbbb36872224482bb21836d47cce8be8c.tar.bz2
fuse: Convert fc->attr_version into atomic64_t
This patch makes fc->attr_version of atomic64_t type, so fc->lock won't be needed to read or modify it anymore. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/fuse/dir.c19
-rw-r--r--fs/fuse/file.c8
-rw-r--r--fs/fuse/fuse_i.h9
-rw-r--r--fs/fuse/inode.c4
4 files changed, 14 insertions, 26 deletions
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 46c7430b94fc..10106f23e9e8 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -149,21 +149,6 @@ static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args,
args->out.args[0].value = outarg;
}
-u64 fuse_get_attr_version(struct fuse_conn *fc)
-{
- u64 curr_version;
-
- /*
- * The spin lock isn't actually needed on 64bit archs, but we
- * don't yet care too much about such optimizations.
- */
- spin_lock(&fc->lock);
- curr_version = fc->attr_version;
- spin_unlock(&fc->lock);
-
- return curr_version;
-}
-
/*
* Check whether the dentry is still valid
*
@@ -674,7 +659,7 @@ static int fuse_unlink(struct inode *dir, struct dentry *entry)
struct fuse_inode *fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
- fi->attr_version = ++fc->attr_version;
+ fi->attr_version = atomic64_inc_return(&fc->attr_version);
/*
* If i_nlink == 0 then unlink doesn't make sense, yet this can
* happen if userspace filesystem is careless. It would be
@@ -828,7 +813,7 @@ static int fuse_link(struct dentry *entry, struct inode *newdir,
struct fuse_inode *fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
- fi->attr_version = ++fc->attr_version;
+ fi->attr_version = atomic64_inc_return(&fc->attr_version);
inc_nlink(inode);
spin_unlock(&fc->lock);
fuse_invalidate_attr(inode);
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index cecd9b7e0b7f..d1becba30bf3 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -187,7 +187,7 @@ void fuse_finish_open(struct inode *inode, struct file *file)
struct fuse_inode *fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
- fi->attr_version = ++fc->attr_version;
+ fi->attr_version = atomic64_inc_return(&fc->attr_version);
i_size_write(inode, 0);
spin_unlock(&fc->lock);
fuse_invalidate_attr(inode);
@@ -608,7 +608,7 @@ static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
struct fuse_inode *fi = get_fuse_inode(inode);
spin_lock(&fc->lock);
- fi->attr_version = ++fc->attr_version;
+ fi->attr_version = atomic64_inc_return(&fc->attr_version);
spin_unlock(&fc->lock);
}
@@ -687,7 +687,7 @@ static void fuse_read_update_size(struct inode *inode, loff_t size,
spin_lock(&fc->lock);
if (attr_ver == fi->attr_version && size < inode->i_size &&
!test_bit(FUSE_I_SIZE_UNSTABLE, &fi->state)) {
- fi->attr_version = ++fc->attr_version;
+ fi->attr_version = atomic64_inc_return(&fc->attr_version);
i_size_write(inode, size);
}
spin_unlock(&fc->lock);
@@ -1006,7 +1006,7 @@ bool fuse_write_update_size(struct inode *inode, loff_t pos)
bool ret = false;
spin_lock(&fc->lock);
- fi->attr_version = ++fc->attr_version;
+ fi->attr_version = atomic64_inc_return(&fc->attr_version);
if (pos > inode->i_size) {
i_size_write(inode, pos);
ret = true;
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 1b536b6c20f9..47c7b2238f91 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -730,7 +730,7 @@ struct fuse_conn {
struct fuse_req *destroy_req;
/** Version counter for attribute changes */
- u64 attr_version;
+ atomic64_t attr_version;
/** Called on final put */
void (*release)(struct fuse_conn *);
@@ -770,6 +770,11 @@ static inline int invalid_nodeid(u64 nodeid)
return !nodeid || nodeid == FUSE_ROOT_ID;
}
+static inline u64 fuse_get_attr_version(struct fuse_conn *fc)
+{
+ return atomic64_read(&fc->attr_version);
+}
+
/** Device operations */
extern const struct file_operations fuse_dev_operations;
@@ -1000,8 +1005,6 @@ void fuse_flush_writepages(struct inode *inode);
void fuse_set_nowrite(struct inode *inode);
void fuse_release_nowrite(struct inode *inode);
-u64 fuse_get_attr_version(struct fuse_conn *fc);
-
/**
* File-system tells the kernel to invalidate cache for the given node id.
*/
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index c2d4099429be..86e86fcd6267 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -163,7 +163,7 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_inode *fi = get_fuse_inode(inode);
- fi->attr_version = ++fc->attr_version;
+ fi->attr_version = atomic64_inc_return(&fc->attr_version);
fi->i_time = attr_valid;
WRITE_ONCE(fi->inval_mask, 0);
@@ -624,7 +624,7 @@ void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns)
fc->blocked = 0;
fc->initialized = 0;
fc->connected = 1;
- fc->attr_version = 1;
+ atomic64_set(&fc->attr_version, 1);
get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
fc->pid_ns = get_pid_ns(task_active_pid_ns(current));
fc->user_ns = get_user_ns(user_ns);