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e49c7b2f6d
Turn the afs_operation struct into the main way that most fileserver
operations are managed. Various things are added to the struct, including
the following:
(1) All the parameters and results of the relevant operations are moved
into it, removing corresponding fields from the afs_call struct.
afs_call gets a pointer to the op.
(2) The target volume is made the main focus of the operation, rather than
the target vnode(s), and a bunch of op->vnode->volume are made
op->volume instead.
(3) Two vnode records are defined (op->file[]) for the vnode(s) involved
in most operations. The vnode record (struct afs_vnode_param)
contains:
- The vnode pointer.
- The fid of the vnode to be included in the parameters or that was
returned in the reply (eg. FS.MakeDir).
- The status and callback information that may be returned in the
reply about the vnode.
- Callback break and data version tracking for detecting
simultaneous third-parth changes.
(4) Pointers to dentries to be updated with new inodes.
(5) An operations table pointer. The table includes pointers to functions
for issuing AFS and YFS-variant RPCs, handling the success and abort
of an operation and handling post-I/O-lock local editing of a
directory.
To make this work, the following function restructuring is made:
(A) The rotation loop that issues calls to fileservers that can be found
in each function that wants to issue an RPC (such as afs_mkdir()) is
extracted out into common code, in a new file called fs_operation.c.
(B) The rotation loops, such as the one in afs_mkdir(), are replaced with
a much smaller piece of code that allocates an operation, sets the
parameters and then calls out to the common code to do the actual
work.
(C) The code for handling the success and failure of an operation are
moved into operation functions (as (5) above) and these are called
from the core code at appropriate times.
(D) The pseudo inode getting stuff used by the dynamic root code is moved
over into dynroot.c.
(E) struct afs_iget_data is absorbed into the operation struct and
afs_iget() expects to be given an op pointer and a vnode record.
(F) Point (E) doesn't work for the root dir of a volume, but we know the
FID in advance (it's always vnode 1, unique 1), so a separate inode
getter, afs_root_iget(), is provided to special-case that.
(G) The inode status init/update functions now also take an op and a vnode
record.
(H) The RPC marshalling functions now, for the most part, just take an
afs_operation struct as their only argument. All the data they need
is held there. The result delivery functions write their answers
there as well.
(I) The call is attached to the operation and then the operation core does
the waiting.
And then the new operation code is, for the moment, made to just initialise
the operation, get the appropriate vnode I/O locks and do the same rotation
loop as before.
This lays the foundation for the following changes in the future:
(*) Overhauling the rotation (again).
(*) Support for asynchronous I/O, where the fileserver rotation must be
done asynchronously also.
Signed-off-by: David Howells <dhowells@redhat.com>
206 lines
6.8 KiB
C
206 lines
6.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* AFS common types
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*
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* Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#ifndef AFS_H
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#define AFS_H
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#include <linux/in.h>
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#define AFS_MAXCELLNAME 64 /* Maximum length of a cell name */
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#define AFS_MAXVOLNAME 64 /* Maximum length of a volume name */
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#define AFS_MAXNSERVERS 8 /* Maximum servers in a basic volume record */
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#define AFS_NMAXNSERVERS 13 /* Maximum servers in a N/U-class volume record */
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#define AFS_MAXTYPES 3 /* Maximum number of volume types */
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#define AFSNAMEMAX 256 /* Maximum length of a filename plus NUL */
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#define AFSPATHMAX 1024 /* Maximum length of a pathname plus NUL */
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#define AFSOPAQUEMAX 1024 /* Maximum length of an opaque field */
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#define AFS_VL_MAX_LIFESPAN (120 * HZ)
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#define AFS_PROBE_MAX_LIFESPAN (30 * HZ)
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typedef u64 afs_volid_t;
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typedef u64 afs_vnodeid_t;
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typedef u64 afs_dataversion_t;
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typedef enum {
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AFSVL_RWVOL, /* read/write volume */
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AFSVL_ROVOL, /* read-only volume */
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AFSVL_BACKVOL, /* backup volume */
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} __attribute__((packed)) afs_voltype_t;
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typedef enum {
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AFS_FTYPE_INVALID = 0,
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AFS_FTYPE_FILE = 1,
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AFS_FTYPE_DIR = 2,
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AFS_FTYPE_SYMLINK = 3,
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} afs_file_type_t;
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typedef enum {
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AFS_LOCK_READ = 0, /* read lock request */
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AFS_LOCK_WRITE = 1, /* write lock request */
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} afs_lock_type_t;
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#define AFS_LOCKWAIT (5 * 60) /* time until a lock times out (seconds) */
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/*
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* AFS file identifier
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*/
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struct afs_fid {
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afs_volid_t vid; /* volume ID */
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afs_vnodeid_t vnode; /* Lower 64-bits of file index within volume */
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u32 vnode_hi; /* Upper 32-bits of file index */
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u32 unique; /* unique ID number (file index version) */
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};
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/*
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* AFS callback notification
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*/
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typedef enum {
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AFSCM_CB_UNTYPED = 0, /* no type set on CB break */
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AFSCM_CB_EXCLUSIVE = 1, /* CB exclusive to CM [not implemented] */
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AFSCM_CB_SHARED = 2, /* CB shared by other CM's */
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AFSCM_CB_DROPPED = 3, /* CB promise cancelled by file server */
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} afs_callback_type_t;
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struct afs_callback {
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time64_t expires_at; /* Time at which expires */
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//unsigned version; /* Callback version */
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//afs_callback_type_t type; /* Type of callback */
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};
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struct afs_callback_break {
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struct afs_fid fid; /* File identifier */
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//struct afs_callback cb; /* Callback details */
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};
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#define AFSCBMAX 50 /* maximum callbacks transferred per bulk op */
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struct afs_uuid {
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__be32 time_low; /* low part of timestamp */
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__be16 time_mid; /* mid part of timestamp */
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__be16 time_hi_and_version; /* high part of timestamp and version */
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__s8 clock_seq_hi_and_reserved; /* clock seq hi and variant */
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__s8 clock_seq_low; /* clock seq low */
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__s8 node[6]; /* spatially unique node ID (MAC addr) */
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};
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/*
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* AFS volume information
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*/
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struct afs_volume_info {
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afs_volid_t vid; /* volume ID */
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afs_voltype_t type; /* type of this volume */
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afs_volid_t type_vids[5]; /* volume ID's for possible types for this vol */
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/* list of fileservers serving this volume */
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size_t nservers; /* number of entries used in servers[] */
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struct {
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struct in_addr addr; /* fileserver address */
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} servers[8];
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};
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/*
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* AFS security ACE access mask
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*/
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typedef u32 afs_access_t;
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#define AFS_ACE_READ 0x00000001U /* - permission to read a file/dir */
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#define AFS_ACE_WRITE 0x00000002U /* - permission to write/chmod a file */
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#define AFS_ACE_INSERT 0x00000004U /* - permission to create dirent in a dir */
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#define AFS_ACE_LOOKUP 0x00000008U /* - permission to lookup a file/dir in a dir */
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#define AFS_ACE_DELETE 0x00000010U /* - permission to delete a dirent from a dir */
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#define AFS_ACE_LOCK 0x00000020U /* - permission to lock a file */
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#define AFS_ACE_ADMINISTER 0x00000040U /* - permission to change ACL */
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#define AFS_ACE_USER_A 0x01000000U /* - 'A' user-defined permission */
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#define AFS_ACE_USER_B 0x02000000U /* - 'B' user-defined permission */
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#define AFS_ACE_USER_C 0x04000000U /* - 'C' user-defined permission */
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#define AFS_ACE_USER_D 0x08000000U /* - 'D' user-defined permission */
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#define AFS_ACE_USER_E 0x10000000U /* - 'E' user-defined permission */
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#define AFS_ACE_USER_F 0x20000000U /* - 'F' user-defined permission */
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#define AFS_ACE_USER_G 0x40000000U /* - 'G' user-defined permission */
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#define AFS_ACE_USER_H 0x80000000U /* - 'H' user-defined permission */
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/*
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* AFS file status information
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*/
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struct afs_file_status {
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u64 size; /* file size */
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afs_dataversion_t data_version; /* current data version */
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struct timespec64 mtime_client; /* Last time client changed data */
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struct timespec64 mtime_server; /* Last time server changed data */
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s64 author; /* author ID */
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s64 owner; /* owner ID */
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s64 group; /* group ID */
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afs_access_t caller_access; /* access rights for authenticated caller */
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afs_access_t anon_access; /* access rights for unauthenticated caller */
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umode_t mode; /* UNIX mode */
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afs_file_type_t type; /* file type */
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u32 nlink; /* link count */
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s32 lock_count; /* file lock count (0=UNLK -1=WRLCK +ve=#RDLCK */
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u32 abort_code; /* Abort if bulk-fetching this failed */
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};
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struct afs_status_cb {
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struct afs_file_status status;
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struct afs_callback callback;
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bool have_status; /* True if status record was retrieved */
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bool have_cb; /* True if cb record was retrieved */
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bool have_error; /* True if status.abort_code indicates an error */
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};
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/*
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* AFS file status change request
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*/
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#define AFS_SET_MTIME 0x01 /* set the mtime */
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#define AFS_SET_OWNER 0x02 /* set the owner ID */
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#define AFS_SET_GROUP 0x04 /* set the group ID (unsupported?) */
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#define AFS_SET_MODE 0x08 /* set the UNIX mode */
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#define AFS_SET_SEG_SIZE 0x10 /* set the segment size (unsupported) */
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/*
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* AFS volume synchronisation information
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*/
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struct afs_volsync {
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time64_t creation; /* volume creation time */
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};
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/*
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* AFS volume status record
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*/
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struct afs_volume_status {
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afs_volid_t vid; /* volume ID */
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afs_volid_t parent_id; /* parent volume ID */
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u8 online; /* true if volume currently online and available */
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u8 in_service; /* true if volume currently in service */
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u8 blessed; /* same as in_service */
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u8 needs_salvage; /* true if consistency checking required */
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u32 type; /* volume type (afs_voltype_t) */
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u64 min_quota; /* minimum space set aside (blocks) */
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u64 max_quota; /* maximum space this volume may occupy (blocks) */
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u64 blocks_in_use; /* space this volume currently occupies (blocks) */
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u64 part_blocks_avail; /* space available in volume's partition */
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u64 part_max_blocks; /* size of volume's partition */
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s64 vol_copy_date;
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s64 vol_backup_date;
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};
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#define AFS_BLOCK_SIZE 1024
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/*
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* XDR encoding of UUID in AFS.
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*/
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struct afs_uuid__xdr {
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__be32 time_low;
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__be32 time_mid;
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__be32 time_hi_and_version;
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__be32 clock_seq_hi_and_reserved;
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__be32 clock_seq_low;
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__be32 node[6];
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};
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#endif /* AFS_H */
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