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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: make fuse_dentry_revalidate() RCU aware
  fuse: make fuse_permission() RCU aware
  fuse: wakeup pollers on connection release/abort
  fuse: reduce size of struct fuse_request
This commit is contained in:
Linus Torvalds 2011-03-22 10:42:43 -07:00
parent 73d5a8675f e7c0a16786
commit f741a79e98
5 changed files with 54 additions and 16 deletions
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12
fs/fuse/cuse.c
View File

@ -305,7 +305,7 @@ static void cuse_gendev_release(struct device *dev)
static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
{
struct cuse_conn *cc = fc_to_cc(fc);
struct cuse_init_out *arg = &req->misc.cuse_init_out;
struct cuse_init_out *arg = req->out.args[0].value;
struct page *page = req->pages[0];
struct cuse_devinfo devinfo = { };
struct device *dev;
@ -384,6 +384,7 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
dev_set_uevent_suppress(dev, 0);
kobject_uevent(&dev->kobj, KOBJ_ADD);
out:
kfree(arg);
__free_page(page);
return;
@ -405,6 +406,7 @@ static int cuse_send_init(struct cuse_conn *cc)
struct page *page;
struct fuse_conn *fc = &cc->fc;
struct cuse_init_in *arg;
void *outarg;
BUILD_BUG_ON(CUSE_INIT_INFO_MAX > PAGE_SIZE);
@ -419,6 +421,10 @@ static int cuse_send_init(struct cuse_conn *cc)
if (!page)
goto err_put_req;
outarg = kzalloc(sizeof(struct cuse_init_out), GFP_KERNEL);
if (!outarg)
goto err_free_page;
arg = &req->misc.cuse_init_in;
arg->major = FUSE_KERNEL_VERSION;
arg->minor = FUSE_KERNEL_MINOR_VERSION;
@ -429,7 +435,7 @@ static int cuse_send_init(struct cuse_conn *cc)
req->in.args[0].value = arg;
req->out.numargs = 2;
req->out.args[0].size = sizeof(struct cuse_init_out);
req->out.args[0].value = &req->misc.cuse_init_out;
req->out.args[0].value = outarg;
req->out.args[1].size = CUSE_INIT_INFO_MAX;
req->out.argvar = 1;
req->out.argpages = 1;
@ -440,6 +446,8 @@ static int cuse_send_init(struct cuse_conn *cc)
return 0;
err_free_page:
__free_page(page);
err_put_req:
fuse_put_request(fc, req);
err:

17
fs/fuse/dev.c
View File

@ -1910,6 +1910,21 @@ __acquires(fc->lock)
kfree(dequeue_forget(fc, 1, NULL));
}
static void end_polls(struct fuse_conn *fc)
{
struct rb_node *p;
p = rb_first(&fc->polled_files);
while (p) {
struct fuse_file *ff;
ff = rb_entry(p, struct fuse_file, polled_node);
wake_up_interruptible_all(&ff->poll_wait);
p = rb_next(p);
}
}
/*
* Abort all requests.
*
@ -1937,6 +1952,7 @@ void fuse_abort_conn(struct fuse_conn *fc)
fc->blocked = 0;
end_io_requests(fc);
end_queued_requests(fc);
end_polls(fc);
wake_up_all(&fc->waitq);
wake_up_all(&fc->blocked_waitq);
kill_fasync(&fc->fasync, SIGIO, POLL_IN);
@ -1953,6 +1969,7 @@ int fuse_dev_release(struct inode *inode, struct file *file)
fc->connected = 0;
fc->blocked = 0;
end_queued_requests(fc);
end_polls(fc);
wake_up_all(&fc->blocked_waitq);
spin_unlock(&fc->lock);
fuse_conn_put(fc);

38
fs/fuse/dir.c
View File

@ -158,10 +158,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
{
struct inode *inode;
if (nd && nd->flags & LOOKUP_RCU)
return -ECHILD;
inode = entry->d_inode;
inode = ACCESS_ONCE(entry->d_inode);
if (inode && is_bad_inode(inode))
return 0;
else if (fuse_dentry_time(entry) < get_jiffies_64()) {
@ -177,6 +174,9 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
if (!inode)
return 0;
if (nd->flags & LOOKUP_RCU)
return -ECHILD;
fc = get_fuse_conn(inode);
req = fuse_get_req(fc);
if (IS_ERR(req))
@ -970,6 +970,14 @@ static int fuse_access(struct inode *inode, int mask)
return err;
}
static int fuse_perm_getattr(struct inode *inode, int flags)
{
if (flags & IPERM_FLAG_RCU)
return -ECHILD;
return fuse_do_getattr(inode, NULL, NULL);
}
/*
* Check permission. The two basic access models of FUSE are:
*
@ -989,9 +997,6 @@ static int fuse_permission(struct inode *inode, int mask, unsigned int flags)
bool refreshed = false;
int err = 0;
if (flags & IPERM_FLAG_RCU)
return -ECHILD;
if (!fuse_allow_task(fc, current))
return -EACCES;
@ -1000,9 +1005,15 @@ static int fuse_permission(struct inode *inode, int mask, unsigned int flags)
*/
if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
err = fuse_update_attributes(inode, NULL, NULL, &refreshed);
if (err)
return err;
struct fuse_inode *fi = get_fuse_inode(inode);
if (fi->i_time < get_jiffies_64()) {
refreshed = true;
err = fuse_perm_getattr(inode, flags);
if (err)
return err;
}
}
if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
@ -1012,7 +1023,7 @@ static int fuse_permission(struct inode *inode, int mask, unsigned int flags)
attributes. This is also needed, because the root
node will at first have no permissions */
if (err == -EACCES && !refreshed) {
err = fuse_do_getattr(inode, NULL, NULL);
err = fuse_perm_getattr(inode, flags);
if (!err)
err = generic_permission(inode, mask,
flags, NULL);
@ -1023,13 +1034,16 @@ static int fuse_permission(struct inode *inode, int mask, unsigned int flags)
noticed immediately, only after the attribute
timeout has expired */
} else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
if (flags & IPERM_FLAG_RCU)
return -ECHILD;
err = fuse_access(inode, mask);
} else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
if (!(inode->i_mode & S_IXUGO)) {
if (refreshed)
return -EACCES;
err = fuse_do_getattr(inode, NULL, NULL);
err = fuse_perm_getattr(inode, flags);
if (!err && !(inode->i_mode & S_IXUGO))
return -EACCES;
}

2
fs/fuse/file.c
View File

@ -222,7 +222,7 @@ static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode)
rb_erase(&ff->polled_node, &fc->polled_files);
spin_unlock(&fc->lock);
wake_up_interruptible_sync(&ff->poll_wait);
wake_up_interruptible_all(&ff->poll_wait);
inarg->fh = ff->fh;
inarg->flags = flags;

1
fs/fuse/fuse_i.h
View File

@ -272,7 +272,6 @@ struct fuse_req {
struct fuse_init_in init_in;
struct fuse_init_out init_out;
struct cuse_init_in cuse_init_in;
struct cuse_init_out cuse_init_out;
struct {
struct fuse_read_in in;
u64 attr_ver;