From: Fabian Frederick <fabf@xxxxxxxxx> Subject: 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@xxxxxxxxx Signed-off-by: Fabian Frederick <fabf@xxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/affs/affs.h | 1 + fs/affs/namei.c | 40 ++++++++++++++++++++++++++++++++++++++++ fs/affs/super.c | 1 + 3 files changed, 42 insertions(+) diff -puN fs/affs/affs.h~fs-affs-make-affs-exportable fs/affs/affs.h --- a/fs/affs/affs.h~fs-affs-make-affs-exportable +++ a/fs/affs/affs.h @@ -162,6 +162,7 @@ extern void affs_free_bitmap(struct supe /* 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); diff -puN fs/affs/namei.c~fs-affs-make-affs-exportable fs/affs/namei.c --- a/fs/affs/namei.c~fs-affs-make-affs-exportable +++ a/fs/affs/namei.c @@ -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, +}; diff -puN fs/affs/super.c~fs-affs-make-affs-exportable fs/affs/super.c --- a/fs/affs/super.c~fs-affs-make-affs-exportable +++ a/fs/affs/super.c @@ -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; } _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
