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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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10
fs/hostfs/hostfs_kern.c
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@@ -892,9 +892,13 @@ static const struct inode_operations hostfs_dir_iops = {
.setattr = hostfs_setattr,
};
static const char *hostfs_follow_link(struct dentry *dentry, void **cookie)
static const char *hostfs_get_link(struct dentry *dentry,
struct inode *inode, void **cookie)
{
char *link = __getname();
char *link;
if (!dentry)
return ERR_PTR(-ECHILD);
link = __getname();
if (link) {
char *path = dentry_name(dentry);
int err = -ENOMEM;
@@ -922,7 +926,7 @@ static void hostfs_put_link(struct inode *unused, void *cookie)
static const struct inode_operations hostfs_link_iops = {
.readlink = generic_readlink,
.follow_link = hostfs_follow_link,
.get_link = hostfs_get_link,
.put_link = hostfs_put_link,
};