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Notes for porting Hgfs from Solaris 9 to 10
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===========================================
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Note that Solaris 10 is a beta and still in development, so these notes may
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become outdated. They are based on the headers in build 52.
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o Now use vn_make_ops() to create vnodeops
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int vn_make_ops(const char *, const fs_operation_def_t *, vnodeops_t **);
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void vn_freevnodeops(vnodeops_t *);
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o Now use vfs_makefsops()/vfs_setfsops() to create vfsops
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o There is a new structure struct fs_operation_def_t:
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typedef int (*fs_generic_func_p) ();
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typedef struct fs_operation_def {
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char *name; /* name of operation (NUL terminated) */
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fs_generic_func_p func; /* function implementing operation */
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The name is likely one of the VOPNAME_* macros.
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o vnodes should only be created by calls to vn_alloc(); they may not be embedded
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in fs-specific structures; vnodes may change size. Definitions for related
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vnode allocation/freeing functions are:
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vnode_t *vn_alloc(int);
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void vn_reinit(vnode_t *);
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void vn_free(vnode_t *);
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Note that the vn_free() function destroys the vnode's mutex so doing so
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yourself will crash the system.
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o There are a quite a few new vnode manipulation functions; see vnode.h.
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o v_vfsmountedhere member of struct vnode is private, perhaps we shouldn't touch
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it; it is also protected by vn_vfswlock in vnode.c
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o A number of private members were added to struct vnode -- shouldn't affect us
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o New structure struct caller_context contains PID of caller, system ID, and
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a caller identifier. This structure is now passed in as the last argument to:
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o vop_shrlock now takes an additional cred_t * argument as its last argument
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o A new vnodeop was added:
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int (*vop_vnevent)(vnode_t *, vnevent_t);
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This likely has to do "something" to the vnode depending on the value of
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vnevent_t. It is likely that this is required since the vnode now stores the
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cached path of the file in its private char *v_path member. Can we use
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vnevent_*() for help, or do these call us? How about the new vn_setpath*(),
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vn_path(), and vn_copypath() functions? (We should use the VN_SETPATH() macro
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instead of calling vn_setpath() directly.)
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o vnevent_t is a new enum with the following definition:
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typedef enum vnevent {
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VE_SUPPORT = 0, /* Query */
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VE_RENAME_SRC = 1, /* Rename, with vnode as source */
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VE_RENAME_DEST = 2, /* Rename, with vnode as target/dest */
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VE_REMOVE = 3, /* Remove of vnode's name */
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VE_RMDIR = 4 /* Remove of directory vnode's name */
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o A new macro VN_SET_VFS_TYPE_DEV(vp, vfsp, type, dev) was created, but it is
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o VN_CMP() now calls vn_getops() rather than dereferencing the vnode's vn_ops
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member. (We should use this to access that variable too, it seems.)
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o There is no more VN_INIT() macro, but it was trivial anyhow.
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o Filesystems now must supply their list of vfs operations using:
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int vfs_setfsops(int, const fs_operation_def_t *, vfsops_t **);
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o There are also functions for filesystems to make, free, etc vfs operation
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int vfs_makefsops(const fs_operation_def_t *, vfsops_t **);
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void vfs_freevfsops(vfsops_t *);
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int vfs_freevfsops_by_type(int);
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void vfs_setops(vfs_t *, vfsops_t *);
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vfsops_t *vfs_getops(vfs_t *vfsp);
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<there are some more: see vfs.h>
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The names placed in fs_operation_def_t->name are likely one of the VFSNAME_*
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o This isn't relevant to our layer, but the vfs now keeps filesystems in
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a double linked circular list rather than a singly linked list. There are
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also issues with zones: each zone has a list of its own mounts.
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o The vfs_op member of struct vfs should never be directly accessed; use the
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accessor functions described above.
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o There is a new function in struct vfsops:
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int (*vfs_vnstate)(vfs_t *, vnode_t *, vntrans_t);
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o vntrans_t is a new enum that is either VNTRANS_EXISTS, VNTRANS_IDLED,
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VNTRANS_RECLAIMED, or VNTRANS_DESTROYED.
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o The function pointer vsw_init member of struct vfssw now has the definition:
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int (*vsw_init)(int, char *)
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Also, the vsw_optproto and vsw_vfsops members are no longer pointers.
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Since we will not be directly including this structure in our modlfs anymore
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(see modctl.h notes), these differences probably don't matter.
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o There is a new structure (that will be used in our modlfs now instead of
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typedef struct vfsdef_v2 {
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int def_version; /* structure version, must be first */
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char *name; /* filesystem type name */
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int (*init) (int, char *); /* init routine */
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int flags; /* fs flags */
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mntopts_t *optproto; /* mount options table prototype */
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Note that build 58 contains the same structure but it is called vfsdef_v3.
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o There are a few other additional macros and functions that likely won't matter
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o struct modlfs now has a struct vfsdef_v3 instead of a struct vfssw
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o other changes don't seem relevant
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o There are no changes to struct cb_ops, struct dev_ops, or any of the command
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enums taken by these functions.
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removed
modules/solaris/vmhgfs/docs/hgfs-9-to-10.txt
