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replace ->follow_link() with new method that could stay in RCU mode

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new method: ->get_link(); replacement of ->follow_link().  The differences
are:
	* inode and dentry are passed separately
	* might be called both in RCU and non-RCU mode;
the former is indicated by passing it a NULL dentry.
	* when called that way it isn't allowed to block
and should return ERR_PTR(-ECHILD) if it needs to be called
in non-RCU mode.

It's a flagday change - the old method is gone, all in-tree instances
converted.  Conversion isn't hard; said that, so far very few instances
do not immediately bail out when called in RCU mode.  That'll change
in the next commits.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2015-11-17 10:20:54 -05:00
parent 21fc61c73c
commit 6b2553918d
45 changed files with 234 additions and 132 deletions
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9
fs/fuse/dir.c
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@@ -1365,14 +1365,17 @@ static int fuse_readdir(struct file *file, struct dir_context *ctx)
return err;
}
static const char *fuse_follow_link(struct dentry *dentry, void **cookie)
static const char *fuse_get_link(struct dentry *dentry,
struct inode *inode, void **cookie)
{
struct inode *inode = d_inode(dentry);
struct fuse_conn *fc = get_fuse_conn(inode);
FUSE_ARGS(args);
char *link;
ssize_t ret;
if (!dentry)
return ERR_PTR(-ECHILD);
link = (char *) __get_free_page(GFP_KERNEL);
if (!link)
return ERR_PTR(-ENOMEM);
@@ -1909,7 +1912,7 @@ static const struct inode_operations fuse_common_inode_operations = {
static const struct inode_operations fuse_symlink_inode_operations = {
.setattr = fuse_setattr,
.follow_link = fuse_follow_link,
.get_link = fuse_get_link,
.put_link = free_page_put_link,
.readlink = generic_readlink,
.getattr = fuse_getattr,