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Linux 4.2 compat: follow_link() / put_link()

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As of Linux 4.2 the kernel has completely retired the nameidata
structure.  One of the few remaining consumers of this interface
were the follow_link() and put_link() callbacks.

This patch adds the required checks to configure to detect the
interface change and updates the functions accordingly.  Migrating
to the simple_follow_link() interface was considered but was decided
against ironically due to the increased complexity.

It also should be noted that the kernel follow_link() and put_link()
interfaces changes several times after 4.1 and but before 4.2.  This
means there is a narrow range of kernel commits which never appear
in an official tag of the Linux kernel which ZoL will not build.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Yao <ryao@gentoo.org>
Issue #3596
This commit is contained in:
Brian Behlendorf
2015-07-15 10:54:26 -07:00
parent 7eb333fbdd
commit bd29109f1a
6 changed files with 81 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/zpl_inode.c
+28 -5
View File
@@ -348,8 +348,13 @@ zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name)
return (error);
}
#ifdef HAVE_FOLLOW_LINK_NAMEIDATA
static void *
zpl_follow_link(struct dentry *dentry, struct nameidata *nd)
#else
const char *
zpl_follow_link(struct dentry *dentry, void **symlink_cookie)
#endif
{
cred_t *cr = CRED();
struct inode *ip = dentry->d_inode;
@@ -372,17 +377,28 @@ zpl_follow_link(struct dentry *dentry, struct nameidata *nd)
cookie = spl_fstrans_mark();
error = -zfs_readlink(ip, &uio, cr);
spl_fstrans_unmark(cookie);
if (error) {
if (error)
kmem_free(link, MAXPATHLEN);
nd_set_link(nd, ERR_PTR(error));
} else {
nd_set_link(nd, link);
}
crfree(cr);
#ifdef HAVE_FOLLOW_LINK_NAMEIDATA
if (error)
nd_set_link(nd, ERR_PTR(error));
else
nd_set_link(nd, link);
return (NULL);
#else
if (error)
return (ERR_PTR(error));
else
return (*symlink_cookie = link);
#endif
}
#ifdef HAVE_PUT_LINK_NAMEIDATA
static void
zpl_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
{
@@ -391,6 +407,13 @@ zpl_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
if (!IS_ERR(link))
kmem_free(link, MAXPATHLEN);
}
#else
static void
zpl_put_link(struct inode *unused, void *symlink_cookie)
{
kmem_free(symlink_cookie, MAXPATHLEN);
}
#endif
static int
zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)