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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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11
fs/configfs/symlink.c
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@@ -279,11 +279,16 @@ static int configfs_getlink(struct dentry *dentry, char * path)
}
static const char *configfs_follow_link(struct dentry *dentry, void **cookie)
static const char *configfs_get_link(struct dentry *dentry,
struct inode *inode, void **cookie)
{
unsigned long page = get_zeroed_page(GFP_KERNEL);
unsigned long page;
int error;
if (!dentry)
return ERR_PTR(-ECHILD);
page = get_zeroed_page(GFP_KERNEL);
if (!page)
return ERR_PTR(-ENOMEM);
@@ -297,7 +302,7 @@ static const char *configfs_follow_link(struct dentry *dentry, void **cookie)
}
const struct inode_operations configfs_symlink_inode_operations = {
.follow_link = configfs_follow_link,
.get_link = configfs_get_link,
.readlink = generic_readlink,
.put_link = free_page_put_link,
.setattr = configfs_setattr,