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

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>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
index ef8bcdb80aca..80a40bcb721c 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -146,7 +146,7 @@ static inline void write3byte(struct sysv_sb_info *sbi,
 
 static const struct inode_operations sysv_symlink_inode_operations = {
         .readlink       = generic_readlink,
-        .follow_link    = page_follow_link_light,
+        .get_link       = page_get_link,
         .put_link       = page_put_link,
         .getattr        = sysv_getattr,
 };