lustre/include/lustre_lite.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  */
   4
   5 #ifndef _LL_H
   6 #define _LL_H
   7
   8 #if defined(__linux__)
   9 #include <linux/lustre_lite.h>
  10 #elif defined(__APPLE__)
  11 #include <darwin/lustre_lite.h>
  12 #elif defined(__WINNT__)
  13 #include <winnt/lustre_lite.h>
  14 #else
  15 #error Unsupported operating system.
  16 #endif
  17
  18 #include <obd_class.h>
  19 #include <obd_ost.h>
  20 #include <lustre_net.h>
  21 #include <lustre_mds.h>
  22 #include <lustre_ha.h>
  23
  24 #ifdef __KERNEL__
  25
  26 /* careful, this is easy to screw up */
  27 #define PAGE_CACHE_MAXBYTES ((__u64)(~0UL) << CFS_PAGE_SHIFT)
  28
  29 #endif
  30
  31 #define LLAP_FROM_COOKIE(c)                                                    \
  32         (LASSERT(((struct ll_async_page *)(c))->llap_magic == LLAP_MAGIC),     \
  33          (struct ll_async_page *)(c))
  34
  35 // 4*1024*1024
  36 #define LL_MAX_BLKSIZE_BITS     (22)
  37 #define LL_MAX_BLKSIZE          (1UL<<LL_MAX_BLKSIZE_BITS)
  38
  39 #include <lustre/lustre_user.h>
  40
  41
  42 struct lustre_rw_params {
  43         int                lrp_lock_mode;
  44         ldlm_policy_data_t lrp_policy;
  45         obd_flag           lrp_brw_flags;
  46         int                lrp_ast_flags;
  47 };
  48
  49 /*
  50  * XXX nikita: this function lives in the header because it is used by both
  51  * llite kernel module and liblustre library, and there is no (?) better place
  52  * to put it in.
  53  */
  54 static inline void lustre_build_lock_params(int cmd, unsigned long open_flags,
  55                                             __u64 connect_flags,
  56                                             loff_t pos, ssize_t len,
  57                                             struct lustre_rw_params *params)
  58 {
  59         params->lrp_lock_mode = (cmd == OBD_BRW_READ) ? LCK_PR : LCK_PW;
  60         params->lrp_brw_flags = 0;
  61
  62         params->lrp_policy.l_extent.start = pos;
  63         params->lrp_policy.l_extent.end = pos + len - 1;
  64         /*
  65          * for now O_APPEND always takes local locks.
  66          */
  67         if (cmd == OBD_BRW_WRITE && (open_flags & O_APPEND)) {
  68                 params->lrp_policy.l_extent.start = 0;
  69                 params->lrp_policy.l_extent.end   = OBD_OBJECT_EOF;
  70         } else if (LIBLUSTRE_CLIENT && (connect_flags & OBD_CONNECT_SRVLOCK)) {
  71                 /*
  72                  * liblustre: OST-side locking for all non-O_APPEND
  73                  * reads/writes.
  74                  */
  75                 params->lrp_lock_mode = LCK_NL;
  76                 params->lrp_brw_flags = OBD_BRW_SRVLOCK;
  77         } else {
  78                 /*
  79                  * nothing special for the kernel. In the future llite may use
  80                  * OST-side locks for small writes into highly contended
  81                  * files.
  82                  */
  83         }
  84         params->lrp_ast_flags = (open_flags & O_NONBLOCK) ?
  85                 LDLM_FL_BLOCK_NOWAIT : 0;
  86 }
  87
  88 /*
  89  * This is embedded into liblustre and llite super-blocks to keep track of
  90  * connect flags (capabilities) supported by all imports given mount is
  91  * connected to.
  92  */
  93 struct lustre_client_ocd {
  94         /*
  95          * This is conjunction of connect_flags across all imports (LOVs) this
  96          * mount is connected to. This field is updated by ll_ocd_update()
  97          * under ->lco_lock.
  98          */
  99         __u64      lco_flags;
 100         spinlock_t lco_lock;
 101 };
 102
 103 /*
 104  * This function is used as an upcall-callback hooked by liblustre and llite
 105  * clients into obd_notify() listeners chain to handle notifications about
 106  * change of import connect_flags. See llu_fsswop_mount() and
 107  * lustre_common_fill_super().
 108  *
 109  * Again, it is dumped into this header for the lack of a better place.
 110  */
 111 static inline int ll_ocd_update(struct obd_device *host,
 112                                 struct obd_device *watched,
 113                                 enum obd_notify_event ev, void *owner)
 114 {
 115         struct lustre_client_ocd *lco;
 116         struct client_obd        *cli;
 117         __u64 flags;
 118         int   result;
 119
 120         ENTRY;
 121         if (!strcmp(watched->obd_type->typ_name, LUSTRE_OSC_NAME)) {
 122                 cli = &watched->u.cli;
 123                 lco = owner;
 124                 flags = cli->cl_import->imp_connect_data.ocd_connect_flags;
 125                 CDEBUG(D_SUPER, "Changing connect_flags: "LPX64" -> "LPX64"\n",
 126                        lco->lco_flags, flags);
 127                 spin_lock(&lco->lco_lock);
 128                 lco->lco_flags &= flags;
 129                 spin_unlock(&lco->lco_lock);
 130                 result = 0;
 131         } else {
 132                 CERROR("unexpected notification from %s %s!\n",
 133                        watched->obd_type->typ_name,
 134                        watched->obd_name);
 135                 result = -EINVAL;
 136         }
 137         RETURN(result);
 138 }
 139
 140 #endif