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