diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/exportfs.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/exportfs.h | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/ANDROID_3.4.5/include/linux/exportfs.h b/ANDROID_3.4.5/include/linux/exportfs.h deleted file mode 100644 index 3a4cef53..00000000 --- a/ANDROID_3.4.5/include/linux/exportfs.h +++ /dev/null @@ -1,196 +0,0 @@ -#ifndef LINUX_EXPORTFS_H -#define LINUX_EXPORTFS_H 1 - -#include <linux/types.h> - -struct dentry; -struct inode; -struct super_block; -struct vfsmount; - -/* limit the handle size to NFSv4 handle size now */ -#define MAX_HANDLE_SZ 128 - -/* - * The fileid_type identifies how the file within the filesystem is encoded. - * In theory this is freely set and parsed by the filesystem, but we try to - * stick to conventions so we can share some generic code and don't confuse - * sniffers like ethereal/wireshark. - * - * The filesystem must not use the value '0' or '0xff'. - */ -enum fid_type { - /* - * The root, or export point, of the filesystem. - * (Never actually passed down to the filesystem. - */ - FILEID_ROOT = 0, - - /* - * 32bit inode number, 32 bit generation number. - */ - FILEID_INO32_GEN = 1, - - /* - * 32bit inode number, 32 bit generation number, - * 32 bit parent directory inode number. - */ - FILEID_INO32_GEN_PARENT = 2, - - /* - * 64 bit object ID, 64 bit root object ID, - * 32 bit generation number. - */ - FILEID_BTRFS_WITHOUT_PARENT = 0x4d, - - /* - * 64 bit object ID, 64 bit root object ID, - * 32 bit generation number, - * 64 bit parent object ID, 32 bit parent generation. - */ - FILEID_BTRFS_WITH_PARENT = 0x4e, - - /* - * 64 bit object ID, 64 bit root object ID, - * 32 bit generation number, - * 64 bit parent object ID, 32 bit parent generation, - * 64 bit parent root object ID. - */ - FILEID_BTRFS_WITH_PARENT_ROOT = 0x4f, - - /* - * 32 bit block number, 16 bit partition reference, - * 16 bit unused, 32 bit generation number. - */ - FILEID_UDF_WITHOUT_PARENT = 0x51, - - /* - * 32 bit block number, 16 bit partition reference, - * 16 bit unused, 32 bit generation number, - * 32 bit parent block number, 32 bit parent generation number - */ - FILEID_UDF_WITH_PARENT = 0x52, - - /* - * 64 bit checkpoint number, 64 bit inode number, - * 32 bit generation number. - */ - FILEID_NILFS_WITHOUT_PARENT = 0x61, - - /* - * 64 bit checkpoint number, 64 bit inode number, - * 32 bit generation number, 32 bit parent generation. - * 64 bit parent inode number. - */ - FILEID_NILFS_WITH_PARENT = 0x62, -}; - -struct fid { - union { - struct { - u32 ino; - u32 gen; - u32 parent_ino; - u32 parent_gen; - } i32; - struct { - u32 block; - u16 partref; - u16 parent_partref; - u32 generation; - u32 parent_block; - u32 parent_generation; - } udf; - __u32 raw[0]; - }; -}; - -/** - * struct export_operations - for nfsd to communicate with file systems - * @encode_fh: encode a file handle fragment from a dentry - * @fh_to_dentry: find the implied object and get a dentry for it - * @fh_to_parent: find the implied object's parent and get a dentry for it - * @get_name: find the name for a given inode in a given directory - * @get_parent: find the parent of a given directory - * @commit_metadata: commit metadata changes to stable storage - * - * See Documentation/filesystems/nfs/Exporting for details on how to use - * this interface correctly. - * - * encode_fh: - * @encode_fh should store in the file handle fragment @fh (using at most - * @max_len bytes) information that can be used by @decode_fh to recover the - * file referred to by the &struct dentry @de. If the @connectable flag is - * set, the encode_fh() should store sufficient information so that a good - * attempt can be made to find not only the file but also it's place in the - * filesystem. This typically means storing a reference to de->d_parent in - * the filehandle fragment. encode_fh() should return the fileid_type on - * success and on error returns 255 (if the space needed to encode fh is - * greater than @max_len*4 bytes). On error @max_len contains the minimum - * size(in 4 byte unit) needed to encode the file handle. - * - * fh_to_dentry: - * @fh_to_dentry is given a &struct super_block (@sb) and a file handle - * fragment (@fh, @fh_len). It should return a &struct dentry which refers - * to the same file that the file handle fragment refers to. If it cannot, - * it should return a %NULL pointer if the file was found but no acceptable - * &dentries were available, or an %ERR_PTR error code indicating why it - * couldn't be found (e.g. %ENOENT or %ENOMEM). Any suitable dentry can be - * returned including, if necessary, a new dentry created with d_alloc_root. - * The caller can then find any other extant dentries by following the - * d_alias links. - * - * fh_to_parent: - * Same as @fh_to_dentry, except that it returns a pointer to the parent - * dentry if it was encoded into the filehandle fragment by @encode_fh. - * - * get_name: - * @get_name should find a name for the given @child in the given @parent - * directory. The name should be stored in the @name (with the - * understanding that it is already pointing to a a %NAME_MAX+1 sized - * buffer. get_name() should return %0 on success, a negative error code - * or error. @get_name will be called without @parent->i_mutex held. - * - * get_parent: - * @get_parent should find the parent directory for the given @child which - * is also a directory. In the event that it cannot be found, or storage - * space cannot be allocated, a %ERR_PTR should be returned. - * - * commit_metadata: - * @commit_metadata should commit metadata changes to stable storage. - * - * Locking rules: - * get_parent is called with child->d_inode->i_mutex down - * get_name is not (which is possibly inconsistent) - */ - -struct export_operations { - int (*encode_fh)(struct dentry *de, __u32 *fh, int *max_len, - int connectable); - struct dentry * (*fh_to_dentry)(struct super_block *sb, struct fid *fid, - int fh_len, int fh_type); - struct dentry * (*fh_to_parent)(struct super_block *sb, struct fid *fid, - int fh_len, int fh_type); - int (*get_name)(struct dentry *parent, char *name, - struct dentry *child); - struct dentry * (*get_parent)(struct dentry *child); - int (*commit_metadata)(struct inode *inode); -}; - -extern int exportfs_encode_fh(struct dentry *dentry, struct fid *fid, - int *max_len, int connectable); -extern struct dentry *exportfs_decode_fh(struct vfsmount *mnt, struct fid *fid, - int fh_len, int fileid_type, int (*acceptable)(void *, struct dentry *), - void *context); - -/* - * Generic helpers for filesystems. - */ -extern struct dentry *generic_fh_to_dentry(struct super_block *sb, - struct fid *fid, int fh_len, int fh_type, - struct inode *(*get_inode) (struct super_block *sb, u64 ino, u32 gen)); -extern struct dentry *generic_fh_to_parent(struct super_block *sb, - struct fid *fid, int fh_len, int fh_type, - struct inode *(*get_inode) (struct super_block *sb, u64 ino, u32 gen)); - -#endif /* LINUX_EXPORTFS_H */ |