mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
8c3905adea
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
864 lines
24 KiB
C
864 lines
24 KiB
C
/*
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* (C) 2001 Clemson University and The University of Chicago
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*
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* See COPYING in top-level directory.
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*/
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/*
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* The PVFS2 Linux kernel support allows PVFS2 volumes to be mounted and
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* accessed through the Linux VFS (i.e. using standard I/O system calls).
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* This support is only needed on clients that wish to mount the file system.
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*
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*/
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/*
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* Declarations and macros for the PVFS2 Linux kernel support.
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*/
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#ifndef __PVFS2KERNEL_H
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#define __PVFS2KERNEL_H
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#include <linux/kernel.h>
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#include <linux/moduleparam.h>
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#include <linux/statfs.h>
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#include <linux/backing-dev.h>
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#include <linux/device.h>
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#include <linux/mpage.h>
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#include <linux/namei.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/vmalloc.h>
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#include <linux/aio.h>
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#include <linux/posix_acl.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/compat.h>
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#include <linux/mount.h>
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#include <linux/uaccess.h>
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#include <linux/atomic.h>
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#include <linux/uio.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/wait.h>
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#include <linux/dcache.h>
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#include <linux/pagemap.h>
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#include <linux/poll.h>
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#include <linux/rwsem.h>
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#include <linux/xattr.h>
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#include <linux/exportfs.h>
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#include <asm/unaligned.h>
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#include "pvfs2-dev-proto.h"
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#ifdef PVFS2_KERNEL_DEBUG
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#define PVFS2_DEFAULT_OP_TIMEOUT_SECS 10
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#else
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#define PVFS2_DEFAULT_OP_TIMEOUT_SECS 20
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#endif
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#define PVFS2_BUFMAP_WAIT_TIMEOUT_SECS 30
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#define PVFS2_DEFAULT_SLOT_TIMEOUT_SECS 900 /* 15 minutes */
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#define PVFS2_REQDEVICE_NAME "pvfs2-req"
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#define PVFS2_DEVREQ_MAGIC 0x20030529
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#define PVFS2_LINK_MAX 0x000000FF
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#define PVFS2_PURGE_RETRY_COUNT 0x00000005
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#define PVFS2_SEEK_END 0x00000002
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#define PVFS2_MAX_NUM_OPTIONS 0x00000004
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#define PVFS2_MAX_MOUNT_OPT_LEN 0x00000080
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#define PVFS2_MAX_FSKEY_LEN 64
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#define MAX_DEV_REQ_UPSIZE (2*sizeof(__s32) + \
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sizeof(__u64) + sizeof(struct pvfs2_upcall_s))
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#define MAX_DEV_REQ_DOWNSIZE (2*sizeof(__s32) + \
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sizeof(__u64) + sizeof(struct pvfs2_downcall_s))
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#define BITS_PER_LONG_DIV_8 (BITS_PER_LONG >> 3)
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/* borrowed from irda.h */
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#ifndef MSECS_TO_JIFFIES
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#define MSECS_TO_JIFFIES(ms) (((ms)*HZ+999)/1000)
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#endif
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#define MAX_ALIGNED_DEV_REQ_UPSIZE \
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(MAX_DEV_REQ_UPSIZE + \
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((((MAX_DEV_REQ_UPSIZE / \
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(BITS_PER_LONG_DIV_8)) * \
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(BITS_PER_LONG_DIV_8)) + \
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(BITS_PER_LONG_DIV_8)) - \
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MAX_DEV_REQ_UPSIZE))
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#define MAX_ALIGNED_DEV_REQ_DOWNSIZE \
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(MAX_DEV_REQ_DOWNSIZE + \
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((((MAX_DEV_REQ_DOWNSIZE / \
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(BITS_PER_LONG_DIV_8)) * \
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(BITS_PER_LONG_DIV_8)) + \
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(BITS_PER_LONG_DIV_8)) - \
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MAX_DEV_REQ_DOWNSIZE))
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/*
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* valid pvfs2 kernel operation states
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*
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* unknown - op was just initialized
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* waiting - op is on request_list (upward bound)
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* inprogr - op is in progress (waiting for downcall)
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* serviced - op has matching downcall; ok
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* purged - op has to start a timer since client-core
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* exited uncleanly before servicing op
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*/
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enum pvfs2_vfs_op_states {
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OP_VFS_STATE_UNKNOWN = 0,
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OP_VFS_STATE_WAITING = 1,
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OP_VFS_STATE_INPROGR = 2,
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OP_VFS_STATE_SERVICED = 4,
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OP_VFS_STATE_PURGED = 8,
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};
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#define set_op_state_waiting(op) ((op)->op_state = OP_VFS_STATE_WAITING)
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#define set_op_state_inprogress(op) ((op)->op_state = OP_VFS_STATE_INPROGR)
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#define set_op_state_serviced(op) ((op)->op_state = OP_VFS_STATE_SERVICED)
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#define set_op_state_purged(op) ((op)->op_state |= OP_VFS_STATE_PURGED)
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#define op_state_waiting(op) ((op)->op_state & OP_VFS_STATE_WAITING)
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#define op_state_in_progress(op) ((op)->op_state & OP_VFS_STATE_INPROGR)
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#define op_state_serviced(op) ((op)->op_state & OP_VFS_STATE_SERVICED)
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#define op_state_purged(op) ((op)->op_state & OP_VFS_STATE_PURGED)
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#define get_op(op) \
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do { \
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atomic_inc(&(op)->aio_ref_count); \
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gossip_debug(GOSSIP_DEV_DEBUG, \
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"(get) Alloced OP (%p:%llu)\n", \
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op, \
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llu((op)->tag)); \
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} while (0)
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#define put_op(op) \
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do { \
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if (atomic_sub_and_test(1, &(op)->aio_ref_count) == 1) { \
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gossip_debug(GOSSIP_DEV_DEBUG, \
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"(put) Releasing OP (%p:%llu)\n", \
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op, \
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llu((op)->tag)); \
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op_release(op); \
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} \
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} while (0)
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#define op_wait(op) (atomic_read(&(op)->aio_ref_count) <= 2 ? 0 : 1)
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/*
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* Defines for controlling whether I/O upcalls are for async or sync operations
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*/
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enum PVFS_async_io_type {
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PVFS_VFS_SYNC_IO = 0,
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PVFS_VFS_ASYNC_IO = 1,
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};
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/*
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* An array of client_debug_mask will be built to hold debug keyword/mask
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* values fetched from userspace.
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*/
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struct client_debug_mask {
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char *keyword;
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__u64 mask1;
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__u64 mask2;
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};
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/*
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* pvfs2 kernel memory related flags
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*/
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#if ((defined PVFS2_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB))
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#define PVFS2_CACHE_CREATE_FLAGS SLAB_RED_ZONE
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#else
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#define PVFS2_CACHE_CREATE_FLAGS 0
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#endif /* ((defined PVFS2_KERNEL_DEBUG) && (defined CONFIG_DEBUG_SLAB)) */
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#define PVFS2_CACHE_ALLOC_FLAGS (GFP_KERNEL)
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#define PVFS2_GFP_FLAGS (GFP_KERNEL)
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#define PVFS2_BUFMAP_GFP_FLAGS (GFP_KERNEL)
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#define pvfs2_kmap(page) kmap(page)
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#define pvfs2_kunmap(page) kunmap(page)
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/* pvfs2 xattr and acl related defines */
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#define PVFS2_XATTR_INDEX_POSIX_ACL_ACCESS 1
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#define PVFS2_XATTR_INDEX_POSIX_ACL_DEFAULT 2
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#define PVFS2_XATTR_INDEX_TRUSTED 3
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#define PVFS2_XATTR_INDEX_DEFAULT 4
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#if 0
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#ifndef POSIX_ACL_XATTR_ACCESS
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#define POSIX_ACL_XATTR_ACCESS "system.posix_acl_access"
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#endif
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#ifndef POSIX_ACL_XATTR_DEFAULT
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#define POSIX_ACL_XATTR_DEFAULT "system.posix_acl_default"
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#endif
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#endif
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#define PVFS2_XATTR_NAME_ACL_ACCESS POSIX_ACL_XATTR_ACCESS
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#define PVFS2_XATTR_NAME_ACL_DEFAULT POSIX_ACL_XATTR_DEFAULT
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#define PVFS2_XATTR_NAME_TRUSTED_PREFIX "trusted."
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#define PVFS2_XATTR_NAME_DEFAULT_PREFIX ""
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/* these functions are defined in pvfs2-utils.c */
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int orangefs_prepare_cdm_array(char *debug_array_string);
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int orangefs_prepare_debugfs_help_string(int);
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/* defined in pvfs2-debugfs.c */
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int pvfs2_client_debug_init(void);
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void debug_string_to_mask(char *, void *, int);
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void do_c_mask(int, char *, struct client_debug_mask **);
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void do_k_mask(int, char *, __u64 **);
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void debug_mask_to_string(void *, int);
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void do_k_string(void *, int);
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void do_c_string(void *, int);
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int check_amalgam_keyword(void *, int);
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int keyword_is_amalgam(char *);
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/*these variables are defined in pvfs2-mod.c */
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extern char kernel_debug_string[PVFS2_MAX_DEBUG_STRING_LEN];
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extern char client_debug_string[PVFS2_MAX_DEBUG_STRING_LEN];
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extern char client_debug_array_string[PVFS2_MAX_DEBUG_STRING_LEN];
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/* HELLO
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extern struct client_debug_mask current_client_mask;
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*/
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extern unsigned int kernel_mask_set_mod_init;
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extern int pvfs2_init_acl(struct inode *inode, struct inode *dir);
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extern const struct xattr_handler *pvfs2_xattr_handlers[];
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extern struct posix_acl *pvfs2_get_acl(struct inode *inode, int type);
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extern int pvfs2_set_acl(struct inode *inode, struct posix_acl *acl, int type);
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int pvfs2_xattr_set_default(struct dentry *dentry,
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const char *name,
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const void *buffer,
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size_t size,
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int flags,
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int handler_flags);
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int pvfs2_xattr_get_default(struct dentry *dentry,
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const char *name,
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void *buffer,
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size_t size,
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int handler_flags);
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/*
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* Redefine xtvec structure so that we could move helper functions out of
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* the define
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*/
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struct xtvec {
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__kernel_off_t xtv_off; /* must be off_t */
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__kernel_size_t xtv_len; /* must be size_t */
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};
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/*
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* pvfs2 data structures
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*/
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struct pvfs2_kernel_op_s {
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enum pvfs2_vfs_op_states op_state;
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__u64 tag;
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/*
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* Set uses_shared_memory to 1 if this operation uses shared memory.
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* If true, then a retry on the op must also get a new shared memory
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* buffer and re-populate it.
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*/
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int uses_shared_memory;
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struct pvfs2_upcall_s upcall;
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struct pvfs2_downcall_s downcall;
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wait_queue_head_t waitq;
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spinlock_t lock;
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int io_completed;
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wait_queue_head_t io_completion_waitq;
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/*
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* upcalls requiring variable length trailers require that this struct
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* be in the request list even after client-core does a read() on the
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* device to dequeue the upcall.
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* if op_linger field goes to 0, we dequeue this op off the list.
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* else we let it stay. What gets passed to the read() is
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* a) if op_linger field is = 1, pvfs2_kernel_op_s itself
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* b) else if = 0, we pass ->upcall.trailer_buf
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* We expect to have only a single upcall trailer buffer,
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* so we expect callers with trailers
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* to set this field to 2 and others to set it to 1.
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*/
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__s32 op_linger, op_linger_tmp;
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/* VFS aio fields */
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/* used by the async I/O code to stash the pvfs2_kiocb_s structure */
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void *priv;
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/* used again for the async I/O code for deallocation */
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atomic_t aio_ref_count;
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int attempts;
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struct list_head list;
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};
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/* per inode private pvfs2 info */
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struct pvfs2_inode_s {
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struct pvfs2_object_kref refn;
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char link_target[PVFS_NAME_MAX];
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__s64 blksize;
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/*
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* Reading/Writing Extended attributes need to acquire the appropriate
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* reader/writer semaphore on the pvfs2_inode_s structure.
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*/
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struct rw_semaphore xattr_sem;
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struct inode vfs_inode;
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sector_t last_failed_block_index_read;
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/*
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* State of in-memory attributes not yet flushed to disk associated
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* with this object
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*/
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unsigned long pinode_flags;
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/* All allocated pvfs2_inode_s objects are chained to a list */
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struct list_head list;
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};
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#define P_ATIME_FLAG 0
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#define P_MTIME_FLAG 1
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#define P_CTIME_FLAG 2
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#define P_MODE_FLAG 3
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#define ClearAtimeFlag(pinode) clear_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)
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#define SetAtimeFlag(pinode) set_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)
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#define AtimeFlag(pinode) test_bit(P_ATIME_FLAG, &(pinode)->pinode_flags)
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#define ClearMtimeFlag(pinode) clear_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)
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#define SetMtimeFlag(pinode) set_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)
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#define MtimeFlag(pinode) test_bit(P_MTIME_FLAG, &(pinode)->pinode_flags)
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#define ClearCtimeFlag(pinode) clear_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)
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#define SetCtimeFlag(pinode) set_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)
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#define CtimeFlag(pinode) test_bit(P_CTIME_FLAG, &(pinode)->pinode_flags)
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#define ClearModeFlag(pinode) clear_bit(P_MODE_FLAG, &(pinode)->pinode_flags)
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#define SetModeFlag(pinode) set_bit(P_MODE_FLAG, &(pinode)->pinode_flags)
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#define ModeFlag(pinode) test_bit(P_MODE_FLAG, &(pinode)->pinode_flags)
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/* per superblock private pvfs2 info */
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struct pvfs2_sb_info_s {
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struct pvfs2_khandle root_khandle;
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__s32 fs_id;
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int id;
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int flags;
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#define PVFS2_OPT_INTR 0x01
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#define PVFS2_OPT_LOCAL_LOCK 0x02
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char devname[PVFS_MAX_SERVER_ADDR_LEN];
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struct super_block *sb;
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int mount_pending;
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struct list_head list;
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};
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/*
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* a temporary structure used only for sb mount time that groups the
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* mount time data provided along with a private superblock structure
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* that is allocated before a 'kernel' superblock is allocated.
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*/
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struct pvfs2_mount_sb_info_s {
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void *data;
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struct pvfs2_khandle root_khandle;
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__s32 fs_id;
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int id;
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};
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/*
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* structure that holds the state of any async I/O operation issued
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* through the VFS. Needed especially to handle cancellation requests
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* or even completion notification so that the VFS client-side daemon
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* can free up its vfs_request slots.
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*/
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struct pvfs2_kiocb_s {
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/* the pointer to the task that initiated the AIO */
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struct task_struct *tsk;
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/* pointer to the kiocb that kicked this operation */
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struct kiocb *kiocb;
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/* buffer index that was used for the I/O */
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struct pvfs2_bufmap *bufmap;
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int buffer_index;
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/* pvfs2 kernel operation type */
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struct pvfs2_kernel_op_s *op;
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/* The user space buffers from/to which I/O is being staged */
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struct iovec *iov;
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/* number of elements in the iovector */
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unsigned long nr_segs;
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/* set to indicate the type of the operation */
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int rw;
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/* file offset */
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loff_t offset;
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/* and the count in bytes */
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size_t bytes_to_be_copied;
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ssize_t bytes_copied;
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int needs_cleanup;
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};
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struct pvfs2_stats {
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unsigned long cache_hits;
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unsigned long cache_misses;
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unsigned long reads;
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unsigned long writes;
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};
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extern struct pvfs2_stats g_pvfs2_stats;
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/*
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NOTE: See Documentation/filesystems/porting for information
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on implementing FOO_I and properly accessing fs private data
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*/
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static inline struct pvfs2_inode_s *PVFS2_I(struct inode *inode)
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{
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return container_of(inode, struct pvfs2_inode_s, vfs_inode);
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}
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static inline struct pvfs2_sb_info_s *PVFS2_SB(struct super_block *sb)
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{
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return (struct pvfs2_sb_info_s *) sb->s_fs_info;
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}
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/* ino_t descends from "unsigned long", 8 bytes, 64 bits. */
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static inline ino_t pvfs2_khandle_to_ino(struct pvfs2_khandle *khandle)
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{
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union {
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unsigned char u[8];
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__u64 ino;
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} ihandle;
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ihandle.u[0] = khandle->u[0] ^ khandle->u[4];
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ihandle.u[1] = khandle->u[1] ^ khandle->u[5];
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ihandle.u[2] = khandle->u[2] ^ khandle->u[6];
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ihandle.u[3] = khandle->u[3] ^ khandle->u[7];
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ihandle.u[4] = khandle->u[12] ^ khandle->u[8];
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ihandle.u[5] = khandle->u[13] ^ khandle->u[9];
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ihandle.u[6] = khandle->u[14] ^ khandle->u[10];
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ihandle.u[7] = khandle->u[15] ^ khandle->u[11];
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return ihandle.ino;
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}
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static inline struct pvfs2_khandle *get_khandle_from_ino(struct inode *inode)
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{
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return &(PVFS2_I(inode)->refn.khandle);
|
|
}
|
|
|
|
static inline __s32 get_fsid_from_ino(struct inode *inode)
|
|
{
|
|
return PVFS2_I(inode)->refn.fs_id;
|
|
}
|
|
|
|
static inline ino_t get_ino_from_khandle(struct inode *inode)
|
|
{
|
|
struct pvfs2_khandle *khandle;
|
|
ino_t ino;
|
|
|
|
khandle = get_khandle_from_ino(inode);
|
|
ino = pvfs2_khandle_to_ino(khandle);
|
|
return ino;
|
|
}
|
|
|
|
static inline ino_t get_parent_ino_from_dentry(struct dentry *dentry)
|
|
{
|
|
return get_ino_from_khandle(dentry->d_parent->d_inode);
|
|
}
|
|
|
|
static inline int is_root_handle(struct inode *inode)
|
|
{
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG,
|
|
"%s: root handle: %pU, this handle: %pU:\n",
|
|
__func__,
|
|
&PVFS2_SB(inode->i_sb)->root_khandle,
|
|
get_khandle_from_ino(inode));
|
|
|
|
if (PVFS_khandle_cmp(&(PVFS2_SB(inode->i_sb)->root_khandle),
|
|
get_khandle_from_ino(inode)))
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
static inline int match_handle(struct pvfs2_khandle resp_handle,
|
|
struct inode *inode)
|
|
{
|
|
gossip_debug(GOSSIP_DCACHE_DEBUG,
|
|
"%s: one handle: %pU, another handle:%pU:\n",
|
|
__func__,
|
|
&resp_handle,
|
|
get_khandle_from_ino(inode));
|
|
|
|
if (PVFS_khandle_cmp(&resp_handle, get_khandle_from_ino(inode)))
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* defined in pvfs2-cache.c
|
|
*/
|
|
int op_cache_initialize(void);
|
|
int op_cache_finalize(void);
|
|
struct pvfs2_kernel_op_s *op_alloc(__s32 type);
|
|
struct pvfs2_kernel_op_s *op_alloc_trailer(__s32 type);
|
|
char *get_opname_string(struct pvfs2_kernel_op_s *new_op);
|
|
void op_release(struct pvfs2_kernel_op_s *op);
|
|
|
|
int dev_req_cache_initialize(void);
|
|
int dev_req_cache_finalize(void);
|
|
void *dev_req_alloc(void);
|
|
void dev_req_release(void *);
|
|
|
|
int pvfs2_inode_cache_initialize(void);
|
|
int pvfs2_inode_cache_finalize(void);
|
|
|
|
int kiocb_cache_initialize(void);
|
|
int kiocb_cache_finalize(void);
|
|
struct pvfs2_kiocb_s *kiocb_alloc(void);
|
|
void kiocb_release(struct pvfs2_kiocb_s *ptr);
|
|
|
|
/*
|
|
* defined in pvfs2-mod.c
|
|
*/
|
|
void purge_inprogress_ops(void);
|
|
|
|
/*
|
|
* defined in waitqueue.c
|
|
*/
|
|
int wait_for_matching_downcall(struct pvfs2_kernel_op_s *op);
|
|
int wait_for_cancellation_downcall(struct pvfs2_kernel_op_s *op);
|
|
void pvfs2_clean_up_interrupted_operation(struct pvfs2_kernel_op_s *op);
|
|
void purge_waiting_ops(void);
|
|
|
|
/*
|
|
* defined in super.c
|
|
*/
|
|
struct dentry *pvfs2_mount(struct file_system_type *fst,
|
|
int flags,
|
|
const char *devname,
|
|
void *data);
|
|
|
|
void pvfs2_kill_sb(struct super_block *sb);
|
|
int pvfs2_remount(struct super_block *sb);
|
|
|
|
int fsid_key_table_initialize(void);
|
|
void fsid_key_table_finalize(void);
|
|
|
|
/*
|
|
* defined in inode.c
|
|
*/
|
|
__u32 convert_to_pvfs2_mask(unsigned long lite_mask);
|
|
struct inode *pvfs2_new_inode(struct super_block *sb,
|
|
struct inode *dir,
|
|
int mode,
|
|
dev_t dev,
|
|
struct pvfs2_object_kref *ref);
|
|
|
|
int pvfs2_setattr(struct dentry *dentry, struct iattr *iattr);
|
|
|
|
int pvfs2_getattr(struct vfsmount *mnt,
|
|
struct dentry *dentry,
|
|
struct kstat *kstat);
|
|
|
|
/*
|
|
* defined in xattr.c
|
|
*/
|
|
int pvfs2_setxattr(struct dentry *dentry,
|
|
const char *name,
|
|
const void *value,
|
|
size_t size,
|
|
int flags);
|
|
|
|
ssize_t pvfs2_getxattr(struct dentry *dentry,
|
|
const char *name,
|
|
void *buffer,
|
|
size_t size);
|
|
|
|
ssize_t pvfs2_listxattr(struct dentry *dentry, char *buffer, size_t size);
|
|
|
|
/*
|
|
* defined in namei.c
|
|
*/
|
|
struct inode *pvfs2_iget(struct super_block *sb,
|
|
struct pvfs2_object_kref *ref);
|
|
|
|
ssize_t pvfs2_inode_read(struct inode *inode,
|
|
char __user *buf,
|
|
size_t count,
|
|
loff_t *offset,
|
|
loff_t readahead_size);
|
|
|
|
/*
|
|
* defined in devpvfs2-req.c
|
|
*/
|
|
int pvfs2_dev_init(void);
|
|
void pvfs2_dev_cleanup(void);
|
|
int is_daemon_in_service(void);
|
|
int fs_mount_pending(__s32 fsid);
|
|
|
|
/*
|
|
* defined in pvfs2-utils.c
|
|
*/
|
|
__s32 fsid_of_op(struct pvfs2_kernel_op_s *op);
|
|
|
|
int pvfs2_flush_inode(struct inode *inode);
|
|
|
|
ssize_t pvfs2_inode_getxattr(struct inode *inode,
|
|
const char *prefix,
|
|
const char *name,
|
|
void *buffer,
|
|
size_t size);
|
|
|
|
int pvfs2_inode_setxattr(struct inode *inode,
|
|
const char *prefix,
|
|
const char *name,
|
|
const void *value,
|
|
size_t size,
|
|
int flags);
|
|
|
|
int pvfs2_inode_getattr(struct inode *inode, __u32 mask);
|
|
|
|
int pvfs2_inode_setattr(struct inode *inode, struct iattr *iattr);
|
|
|
|
void pvfs2_op_initialize(struct pvfs2_kernel_op_s *op);
|
|
|
|
void pvfs2_make_bad_inode(struct inode *inode);
|
|
|
|
void block_signals(sigset_t *);
|
|
|
|
void set_signals(sigset_t *);
|
|
|
|
int pvfs2_unmount_sb(struct super_block *sb);
|
|
|
|
int pvfs2_cancel_op_in_progress(__u64 tag);
|
|
|
|
__u64 pvfs2_convert_time_field(void *time_ptr);
|
|
|
|
int pvfs2_normalize_to_errno(__s32 error_code);
|
|
|
|
extern struct mutex devreq_mutex;
|
|
extern struct mutex request_mutex;
|
|
extern int debug;
|
|
extern int op_timeout_secs;
|
|
extern int slot_timeout_secs;
|
|
extern struct list_head pvfs2_superblocks;
|
|
extern spinlock_t pvfs2_superblocks_lock;
|
|
extern struct list_head pvfs2_request_list;
|
|
extern spinlock_t pvfs2_request_list_lock;
|
|
extern wait_queue_head_t pvfs2_request_list_waitq;
|
|
extern struct list_head *htable_ops_in_progress;
|
|
extern spinlock_t htable_ops_in_progress_lock;
|
|
extern int hash_table_size;
|
|
|
|
extern const struct address_space_operations pvfs2_address_operations;
|
|
extern struct backing_dev_info pvfs2_backing_dev_info;
|
|
extern struct inode_operations pvfs2_file_inode_operations;
|
|
extern const struct file_operations pvfs2_file_operations;
|
|
extern struct inode_operations pvfs2_symlink_inode_operations;
|
|
extern struct inode_operations pvfs2_dir_inode_operations;
|
|
extern const struct file_operations pvfs2_dir_operations;
|
|
extern const struct dentry_operations pvfs2_dentry_operations;
|
|
extern const struct file_operations pvfs2_devreq_file_operations;
|
|
|
|
extern wait_queue_head_t pvfs2_bufmap_init_waitq;
|
|
|
|
/*
|
|
* misc convenience macros
|
|
*/
|
|
#define add_op_to_request_list(op) \
|
|
do { \
|
|
spin_lock(&pvfs2_request_list_lock); \
|
|
spin_lock(&op->lock); \
|
|
set_op_state_waiting(op); \
|
|
list_add_tail(&op->list, &pvfs2_request_list); \
|
|
spin_unlock(&pvfs2_request_list_lock); \
|
|
spin_unlock(&op->lock); \
|
|
wake_up_interruptible(&pvfs2_request_list_waitq); \
|
|
} while (0)
|
|
|
|
#define add_priority_op_to_request_list(op) \
|
|
do { \
|
|
spin_lock(&pvfs2_request_list_lock); \
|
|
spin_lock(&op->lock); \
|
|
set_op_state_waiting(op); \
|
|
\
|
|
list_add(&op->list, &pvfs2_request_list); \
|
|
spin_unlock(&pvfs2_request_list_lock); \
|
|
spin_unlock(&op->lock); \
|
|
wake_up_interruptible(&pvfs2_request_list_waitq); \
|
|
} while (0)
|
|
|
|
#define remove_op_from_request_list(op) \
|
|
do { \
|
|
struct list_head *tmp = NULL; \
|
|
struct list_head *tmp_safe = NULL; \
|
|
struct pvfs2_kernel_op_s *tmp_op = NULL; \
|
|
\
|
|
spin_lock(&pvfs2_request_list_lock); \
|
|
list_for_each_safe(tmp, tmp_safe, &pvfs2_request_list) { \
|
|
tmp_op = list_entry(tmp, \
|
|
struct pvfs2_kernel_op_s, \
|
|
list); \
|
|
if (tmp_op && (tmp_op == op)) { \
|
|
list_del(&tmp_op->list); \
|
|
break; \
|
|
} \
|
|
} \
|
|
spin_unlock(&pvfs2_request_list_lock); \
|
|
} while (0)
|
|
|
|
#define PVFS2_OP_INTERRUPTIBLE 1 /* service_operation() is interruptible */
|
|
#define PVFS2_OP_PRIORITY 2 /* service_operation() is high priority */
|
|
#define PVFS2_OP_CANCELLATION 4 /* this is a cancellation */
|
|
#define PVFS2_OP_NO_SEMAPHORE 8 /* don't acquire semaphore */
|
|
#define PVFS2_OP_ASYNC 16 /* Queue it, but don't wait */
|
|
|
|
int service_operation(struct pvfs2_kernel_op_s *op,
|
|
const char *op_name,
|
|
int flags);
|
|
|
|
/*
|
|
* handles two possible error cases, depending on context.
|
|
*
|
|
* by design, our vfs i/o errors need to be handled in one of two ways,
|
|
* depending on where the error occured.
|
|
*
|
|
* if the error happens in the waitqueue code because we either timed
|
|
* out or a signal was raised while waiting, we need to cancel the
|
|
* userspace i/o operation and free the op manually. this is done to
|
|
* avoid having the device start writing application data to our shared
|
|
* bufmap pages without us expecting it.
|
|
*
|
|
* FIXME: POSSIBLE OPTIMIZATION:
|
|
* However, if we timed out or if we got a signal AND our upcall was never
|
|
* picked off the queue (i.e. we were in OP_VFS_STATE_WAITING), then we don't
|
|
* need to send a cancellation upcall. The way we can handle this is
|
|
* set error_exit to 2 in such cases and 1 whenever cancellation has to be
|
|
* sent and have handle_error
|
|
* take care of this situation as well..
|
|
*
|
|
* if a pvfs2 sysint level error occured and i/o has been completed,
|
|
* there is no need to cancel the operation, as the user has finished
|
|
* using the bufmap page and so there is no danger in this case. in
|
|
* this case, we wake up the device normally so that it may free the
|
|
* op, as normal.
|
|
*
|
|
* note the only reason this is a macro is because both read and write
|
|
* cases need the exact same handling code.
|
|
*/
|
|
#define handle_io_error() \
|
|
do { \
|
|
if (!op_state_serviced(new_op)) { \
|
|
pvfs2_cancel_op_in_progress(new_op->tag); \
|
|
op_release(new_op); \
|
|
} else { \
|
|
wake_up_daemon_for_return(new_op); \
|
|
} \
|
|
new_op = NULL; \
|
|
pvfs_bufmap_put(bufmap, buffer_index); \
|
|
buffer_index = -1; \
|
|
} while (0)
|
|
|
|
#define get_interruptible_flag(inode) \
|
|
((PVFS2_SB(inode->i_sb)->flags & PVFS2_OPT_INTR) ? \
|
|
PVFS2_OP_INTERRUPTIBLE : 0)
|
|
|
|
#define add_pvfs2_sb(sb) \
|
|
do { \
|
|
gossip_debug(GOSSIP_SUPER_DEBUG, \
|
|
"Adding SB %p to pvfs2 superblocks\n", \
|
|
PVFS2_SB(sb)); \
|
|
spin_lock(&pvfs2_superblocks_lock); \
|
|
list_add_tail(&PVFS2_SB(sb)->list, &pvfs2_superblocks); \
|
|
spin_unlock(&pvfs2_superblocks_lock); \
|
|
} while (0)
|
|
|
|
#define remove_pvfs2_sb(sb) \
|
|
do { \
|
|
struct list_head *tmp = NULL; \
|
|
struct list_head *tmp_safe = NULL; \
|
|
struct pvfs2_sb_info_s *pvfs2_sb = NULL; \
|
|
\
|
|
spin_lock(&pvfs2_superblocks_lock); \
|
|
list_for_each_safe(tmp, tmp_safe, &pvfs2_superblocks) { \
|
|
pvfs2_sb = list_entry(tmp, \
|
|
struct pvfs2_sb_info_s, \
|
|
list); \
|
|
if (pvfs2_sb && (pvfs2_sb->sb == sb)) { \
|
|
gossip_debug(GOSSIP_SUPER_DEBUG, \
|
|
"Removing SB %p from pvfs2 superblocks\n", \
|
|
pvfs2_sb); \
|
|
list_del(&pvfs2_sb->list); \
|
|
break; \
|
|
} \
|
|
} \
|
|
spin_unlock(&pvfs2_superblocks_lock); \
|
|
} while (0)
|
|
|
|
#define pvfs2_lock_inode(inode) spin_lock(&inode->i_lock)
|
|
#define pvfs2_unlock_inode(inode) spin_unlock(&inode->i_lock)
|
|
#define pvfs2_current_signal_lock current->sighand->siglock
|
|
#define pvfs2_current_sigaction current->sighand->action
|
|
|
|
#define fill_default_sys_attrs(sys_attr, type, mode) \
|
|
do { \
|
|
sys_attr.owner = from_kuid(current_user_ns(), current_fsuid()); \
|
|
sys_attr.group = from_kgid(current_user_ns(), current_fsgid()); \
|
|
sys_attr.size = 0; \
|
|
sys_attr.perms = PVFS_util_translate_mode(mode); \
|
|
sys_attr.objtype = type; \
|
|
sys_attr.mask = PVFS_ATTR_SYS_ALL_SETABLE; \
|
|
} while (0)
|
|
|
|
#define pvfs2_inode_lock(__i) mutex_lock(&(__i)->i_mutex)
|
|
|
|
#define pvfs2_inode_unlock(__i) mutex_unlock(&(__i)->i_mutex)
|
|
|
|
static inline void pvfs2_i_size_write(struct inode *inode, loff_t i_size)
|
|
{
|
|
#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
|
|
pvfs2_inode_lock(inode);
|
|
#endif
|
|
i_size_write(inode, i_size);
|
|
#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
|
|
pvfs2_inode_unlock(inode);
|
|
#endif
|
|
}
|
|
|
|
static inline unsigned int diff(struct timeval *end, struct timeval *begin)
|
|
{
|
|
if (end->tv_usec < begin->tv_usec) {
|
|
end->tv_usec += 1000000;
|
|
end->tv_sec--;
|
|
}
|
|
end->tv_sec -= begin->tv_sec;
|
|
end->tv_usec -= begin->tv_usec;
|
|
return (end->tv_sec * 1000000) + end->tv_usec;
|
|
}
|
|
|
|
#endif /* __PVFS2KERNEL_H */
|