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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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9
fs/libfs.c
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@ -1092,14 +1092,15 @@ simple_nosetlease(struct file *filp, long arg, struct file_lock **flp,
}
EXPORT_SYMBOL(simple_nosetlease);
const char *simple_follow_link(struct dentry *dentry, void **cookie)
const char *simple_get_link(struct dentry *dentry, struct inode *inode,
void **cookie)
{
return d_inode(dentry)->i_link;
return inode->i_link;
}
EXPORT_SYMBOL(simple_follow_link);
EXPORT_SYMBOL(simple_get_link);
const struct inode_operations simple_symlink_inode_operations = {
.follow_link = simple_follow_link,
.get_link = simple_get_link,
.readlink = generic_readlink
};
EXPORT_SYMBOL(simple_symlink_inode_operations);