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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 <[email protected]>
This commit is contained in:
Al Viro 2015-11-17 10:20:54 -05:00
commit 6b2553918d
45 changed files with 234 additions and 132 deletions
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2
fs/jffs2/symlink.c
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@ -14,7 +14,7 @@
const struct inode_operations jffs2_symlink_inode_operations =
{
.readlink = generic_readlink,
.follow_link = simple_follow_link,
.get_link = simple_get_link,
.setattr = jffs2_setattr,
.setxattr = jffs2_setxattr,
.getxattr = jffs2_getxattr,