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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/kernfs/symlink.c
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@@ -112,10 +112,15 @@ static int kernfs_getlink(struct dentry *dentry, char *path)
return error;
}
static const char *kernfs_iop_follow_link(struct dentry *dentry, void **cookie)
static const char *kernfs_iop_get_link(struct dentry *dentry,
struct inode *inode, void **cookie)
{
int error = -ENOMEM;
unsigned long page = get_zeroed_page(GFP_KERNEL);
unsigned long page;
if (!dentry)
return ERR_PTR(-ECHILD);
page = get_zeroed_page(GFP_KERNEL);
if (!page)
return ERR_PTR(-ENOMEM);
error = kernfs_getlink(dentry, (char *)page);
@@ -132,7 +137,7 @@ const struct inode_operations kernfs_symlink_iops = {
.getxattr = kernfs_iop_getxattr,
.listxattr = kernfs_iop_listxattr,
.readlink = generic_readlink,
.follow_link = kernfs_iop_follow_link,
.get_link = kernfs_iop_get_link,
.put_link = free_page_put_link,
.setattr = kernfs_iop_setattr,
.getattr = kernfs_iop_getattr,