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authorCyrill Gorcunov <gorcunov@openvz.org>2012-12-18 01:05:08 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-18 02:15:27 +0100
commit711c7bf9914060d7aaf3c1a15f38094a5d5e748f (patch)
tree9e77f75166d591c2a3979494253793add2df607a /fs/exportfs
parentfs, exportfs: escape nil dereference if no s_export_op present (diff)
downloadlinux-711c7bf9914060d7aaf3c1a15f38094a5d5e748f.tar.xz
linux-711c7bf9914060d7aaf3c1a15f38094a5d5e748f.zip
fs, exportfs: add exportfs_encode_inode_fh() helper
We will need this helper in the next patch to provide a file handle for inotify marks in /proc/pid/fdinfo output. The patch is rather providing the way to use inodes directly when dentry is not available (like in case of inotify system). Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrey Vagin <avagin@openvz.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: James Bottomley <jbottomley@parallels.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Matthew Helsley <matt.helsley@gmail.com> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/exportfs')
-rw-r--r--fs/exportfs/expfs.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 10f137381ac7..606bb074c501 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -341,10 +341,21 @@ static int export_encode_fh(struct inode *inode, struct fid *fid,
return type;
}
+int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid,
+ int *max_len, struct inode *parent)
+{
+ const struct export_operations *nop = inode->i_sb->s_export_op;
+
+ if (nop && nop->encode_fh)
+ return nop->encode_fh(inode, fid->raw, max_len, parent);
+
+ return export_encode_fh(inode, fid, max_len, parent);
+}
+EXPORT_SYMBOL_GPL(exportfs_encode_inode_fh);
+
int exportfs_encode_fh(struct dentry *dentry, struct fid *fid, int *max_len,
int connectable)
{
- const struct export_operations *nop = dentry->d_sb->s_export_op;
int error;
struct dentry *p = NULL;
struct inode *inode = dentry->d_inode, *parent = NULL;
@@ -357,10 +368,8 @@ int exportfs_encode_fh(struct dentry *dentry, struct fid *fid, int *max_len,
*/
parent = p->d_inode;
}
- if (nop && nop->encode_fh)
- error = nop->encode_fh(inode, fid->raw, max_len, parent);
- else
- error = export_encode_fh(inode, fid, max_len, parent);
+
+ error = exportfs_encode_inode_fh(inode, fid, max_len, parent);
dput(p);
return error;