fs/orangefs/orangefs-cache.c

   1 /*
   2  * (C) 2001 Clemson University and The University of Chicago
   3  *
   4  * See COPYING in top-level directory.
   5  */
   6
   7 #include "protocol.h"
   8 #include "orangefs-kernel.h"
   9
  10 /* tags assigned to kernel upcall operations */
  11 static __u64 next_tag_value;
  12 static DEFINE_SPINLOCK(next_tag_value_lock);
  13
  14 /* the orangefs memory caches */
  15
  16 /* a cache for orangefs upcall/downcall operations */
  17 static struct kmem_cache *op_cache;
  18
  19 int op_cache_initialize(void)
  20 {
  21         op_cache = kmem_cache_create("orangefs_op_cache",
  22                                      sizeof(struct orangefs_kernel_op_s),
  23                                      0,
  24                                      ORANGEFS_CACHE_CREATE_FLAGS,
  25                                      NULL);
  26
  27         if (!op_cache) {
  28                 gossip_err("Cannot create orangefs_op_cache\n");
  29                 return -ENOMEM;
  30         }
  31
  32         /* initialize our atomic tag counter */
  33         spin_lock(&next_tag_value_lock);
  34         next_tag_value = 100;
  35         spin_unlock(&next_tag_value_lock);
  36         return 0;
  37 }
  38
  39 int op_cache_finalize(void)
  40 {
  41         kmem_cache_destroy(op_cache);
  42         return 0;
  43 }
  44
  45 char *get_opname_string(struct orangefs_kernel_op_s *new_op)
  46 {
  47         if (new_op) {
  48                 __s32 type = new_op->upcall.type;
  49
  50                 if (type == ORANGEFS_VFS_OP_FILE_IO)
  51                         return "OP_FILE_IO";
  52                 else if (type == ORANGEFS_VFS_OP_LOOKUP)
  53                         return "OP_LOOKUP";
  54                 else if (type == ORANGEFS_VFS_OP_CREATE)
  55                         return "OP_CREATE";
  56                 else if (type == ORANGEFS_VFS_OP_GETATTR)
  57                         return "OP_GETATTR";
  58                 else if (type == ORANGEFS_VFS_OP_REMOVE)
  59                         return "OP_REMOVE";
  60                 else if (type == ORANGEFS_VFS_OP_MKDIR)
  61                         return "OP_MKDIR";
  62                 else if (type == ORANGEFS_VFS_OP_READDIR)
  63                         return "OP_READDIR";
  64                 else if (type == ORANGEFS_VFS_OP_READDIRPLUS)
  65                         return "OP_READDIRPLUS";
  66                 else if (type == ORANGEFS_VFS_OP_SETATTR)
  67                         return "OP_SETATTR";
  68                 else if (type == ORANGEFS_VFS_OP_SYMLINK)
  69                         return "OP_SYMLINK";
  70                 else if (type == ORANGEFS_VFS_OP_RENAME)
  71                         return "OP_RENAME";
  72                 else if (type == ORANGEFS_VFS_OP_STATFS)
  73                         return "OP_STATFS";
  74                 else if (type == ORANGEFS_VFS_OP_TRUNCATE)
  75                         return "OP_TRUNCATE";
  76                 else if (type == ORANGEFS_VFS_OP_MMAP_RA_FLUSH)
  77                         return "OP_MMAP_RA_FLUSH";
  78                 else if (type == ORANGEFS_VFS_OP_FS_MOUNT)
  79                         return "OP_FS_MOUNT";
  80                 else if (type == ORANGEFS_VFS_OP_FS_UMOUNT)
  81                         return "OP_FS_UMOUNT";
  82                 else if (type == ORANGEFS_VFS_OP_GETXATTR)
  83                         return "OP_GETXATTR";
  84                 else if (type == ORANGEFS_VFS_OP_SETXATTR)
  85                         return "OP_SETXATTR";
  86                 else if (type == ORANGEFS_VFS_OP_LISTXATTR)
  87                         return "OP_LISTXATTR";
  88                 else if (type == ORANGEFS_VFS_OP_REMOVEXATTR)
  89                         return "OP_REMOVEXATTR";
  90                 else if (type == ORANGEFS_VFS_OP_PARAM)
  91                         return "OP_PARAM";
  92                 else if (type == ORANGEFS_VFS_OP_PERF_COUNT)
  93                         return "OP_PERF_COUNT";
  94                 else if (type == ORANGEFS_VFS_OP_CANCEL)
  95                         return "OP_CANCEL";
  96                 else if (type == ORANGEFS_VFS_OP_FSYNC)
  97                         return "OP_FSYNC";
  98                 else if (type == ORANGEFS_VFS_OP_FSKEY)
  99                         return "OP_FSKEY";
 100         }
 101         return "OP_UNKNOWN?";
 102 }
 103
 104 void orangefs_new_tag(struct orangefs_kernel_op_s *op)
 105 {
 106         spin_lock(&next_tag_value_lock);
 107         op->tag = next_tag_value++;
 108         if (next_tag_value == 0)
 109                 next_tag_value = 100;
 110         spin_unlock(&next_tag_value_lock);
 111 }
 112
 113 struct orangefs_kernel_op_s *op_alloc(__s32 type)
 114 {
 115         struct orangefs_kernel_op_s *new_op = NULL;
 116
 117         new_op = kmem_cache_zalloc(op_cache, GFP_KERNEL);
 118         if (new_op) {
 119                 INIT_LIST_HEAD(&new_op->list);
 120                 spin_lock_init(&new_op->lock);
 121                 init_completion(&new_op->waitq);
 122
 123                 new_op->upcall.type = ORANGEFS_VFS_OP_INVALID;
 124                 new_op->downcall.type = ORANGEFS_VFS_OP_INVALID;
 125                 new_op->downcall.status = -1;
 126
 127                 new_op->op_state = OP_VFS_STATE_UNKNOWN;
 128
 129                 /* initialize the op specific tag and upcall credentials */
 130                 orangefs_new_tag(new_op);
 131                 new_op->upcall.type = type;
 132                 new_op->attempts = 0;
 133                 gossip_debug(GOSSIP_CACHE_DEBUG,
 134                              "Alloced OP (%p: %llu %s)\n",
 135                              new_op,
 136                              llu(new_op->tag),
 137                              get_opname_string(new_op));
 138
 139                 new_op->upcall.uid = from_kuid(current_user_ns(),
 140                                                current_fsuid());
 141
 142                 new_op->upcall.gid = from_kgid(current_user_ns(),
 143                                                current_fsgid());
 144         } else {
 145                 gossip_err("op_alloc: kmem_cache_zalloc failed!\n");
 146         }
 147         return new_op;
 148 }
 149
 150 void op_release(struct orangefs_kernel_op_s *orangefs_op)
 151 {
 152         if (orangefs_op) {
 153                 gossip_debug(GOSSIP_CACHE_DEBUG,
 154                              "Releasing OP (%p: %llu)\n",
 155                              orangefs_op,
 156                              llu(orangefs_op->tag));
 157                 kmem_cache_free(op_cache, orangefs_op);
 158         } else {
 159                 gossip_err("NULL pointer in op_release\n");
 160         }
 161 }