diff options
Diffstat (limited to 'fs/exportfs')
| -rw-r--r-- | fs/exportfs/expfs.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c index 8f883c4758f5..7d9fdcc187b7 100644 --- a/fs/exportfs/expfs.c +++ b/fs/exportfs/expfs.c @@ -383,6 +383,32 @@ int generic_encode_ino32_fh(struct inode *inode, __u32 *fh, int *max_len, } EXPORT_SYMBOL_GPL(generic_encode_ino32_fh); +#define FILEID_INO64_GEN_LEN 3 + +/** + * exportfs_encode_ino64_fid - encode non-decodeable 64bit ino file id + * @inode: the object to encode + * @fid: where to store the file handle fragment + * @max_len: maximum length to store there (in 4 byte units) + * + * This generic function is used to encode a non-decodeable file id for + * fanotify for filesystems that do not support NFS export. + */ +static int exportfs_encode_ino64_fid(struct inode *inode, struct fid *fid, + int *max_len) +{ + if (*max_len < FILEID_INO64_GEN_LEN) { + *max_len = FILEID_INO64_GEN_LEN; + return FILEID_INVALID; + } + + fid->i64.ino = inode->i_ino; + fid->i64.gen = inode->i_generation; + *max_len = FILEID_INO64_GEN_LEN; + + return FILEID_INO64_GEN; +} + /** * exportfs_encode_inode_fh - encode a file handle from inode * @inode: the object to encode @@ -401,10 +427,10 @@ int exportfs_encode_inode_fh(struct inode *inode, struct fid *fid, if (!exportfs_can_encode_fh(nop, flags)) return -EOPNOTSUPP; - if (nop && nop->encode_fh) - return nop->encode_fh(inode, fid->raw, max_len, parent); + if (!nop && (flags & EXPORT_FH_FID)) + return exportfs_encode_ino64_fid(inode, fid, max_len); - return -EOPNOTSUPP; + return nop->encode_fh(inode, fid->raw, max_len, parent); } EXPORT_SYMBOL_GPL(exportfs_encode_inode_fh); |