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fs/affs: make affs exportable 

Add standard functions making AFFS work with NFS.

Functions based on ext4 implementation.  Tested on loop device.

Link: http://lkml.kernel.org/r/20170109191208.6085-4-fabf@skynet.be
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Fabian Frederick 2017-02-27 14:27:49 -08:00 committed by Linus Torvalds
parent d5de9fd594
commit ed4433d723
3 changed files with 42 additions and 0 deletions
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1
fs/affs/affs.h
View File

@ -162,6 +162,7 @@ extern void affs_free_bitmap(struct super_block *sb);
/* namei.c */
extern const struct export_operations affs_export_ops;
extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
extern int affs_unlink(struct inode *dir, struct dentry *dentry);

40
fs/affs/namei.c
View File

@ -9,6 +9,7 @@
*/
#include "affs.h"
#include <linux/exportfs.h>
typedef int (*toupper_t)(int);
@ -465,3 +466,42 @@ done:
affs_brelse(bh);
return retval;
}
static struct inode *affs_nfs_get_inode(struct super_block *sb, u64 ino,
u32 generation)
{
struct inode *inode;
if (!affs_validblock(sb, ino))
return ERR_PTR(-ESTALE);
inode = affs_iget(sb, ino);
if (IS_ERR(inode))
return ERR_CAST(inode);
if (generation && inode->i_generation != generation) {
iput(inode);
return ERR_PTR(-ESTALE);
}
return inode;
}
static struct dentry *affs_fh_to_dentry(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type)
{
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
affs_nfs_get_inode);
}
static struct dentry *affs_fh_to_parent(struct super_block *sb, struct fid *fid,
int fh_len, int fh_type)
{
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
affs_nfs_get_inode);
}
const struct export_operations affs_export_ops = {
.fh_to_dentry = affs_fh_to_dentry,
.fh_to_parent = affs_fh_to_parent,
};

1
fs/affs/super.c
View File

@ -507,6 +507,7 @@ got_root:
return -ENOMEM;
}
sb->s_export_op = &affs_export_ops;
pr_debug("s_flags=%lX\n", sb->s_flags);
return 0;
}