git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs.h

   1 #ifndef _LIBBCACHE_H
   2 #define _LIBBCACHE_H
   3
   4 #include <linux/uuid.h>
   5 #include <stdbool.h>
   6
   7 #include "libbcachefs/bcachefs_format.h"
   8 #include "libbcachefs/bcachefs_ioctl.h"
   9 #include "tools-util.h"
  10 #include "libbcachefs/vstructs.h"
  11
  12 struct format_opts {
  13         char            *label;
  14         uuid_le         uuid;
  15
  16         unsigned        on_error_action;
  17
  18         unsigned        block_size;
  19         unsigned        btree_node_size;
  20         unsigned        encoded_extent_max;
  21
  22         unsigned        meta_replicas;
  23         unsigned        data_replicas;
  24
  25         unsigned        meta_replicas_required;
  26         unsigned        data_replicas_required;
  27
  28         const char      *foreground_target;
  29         const char      *background_target;
  30         const char      *promote_target;
  31
  32         unsigned        meta_csum_type;
  33         unsigned        data_csum_type;
  34         unsigned        compression_type;
  35
  36         bool            encrypted;
  37         char            *passphrase;
  38 };
  39
  40 static inline struct format_opts format_opts_default()
  41 {
  42         return (struct format_opts) {
  43                 .on_error_action        = BCH_ON_ERROR_RO,
  44                 .encoded_extent_max     = 128,
  45                 .meta_csum_type         = BCH_CSUM_OPT_CRC32C,
  46                 .data_csum_type         = BCH_CSUM_OPT_CRC32C,
  47                 .meta_replicas          = 1,
  48                 .data_replicas          = 1,
  49                 .meta_replicas_required = 1,
  50                 .data_replicas_required = 1,
  51         };
  52 }
  53
  54 struct dev_opts {
  55         int             fd;
  56         char            *path;
  57         u64             size; /* 512 byte sectors */
  58         unsigned        bucket_size;
  59         const char      *group;
  60         unsigned        data_allowed;
  61         bool            discard;
  62
  63         u64             nbuckets;
  64
  65         u64             sb_offset;
  66         u64             sb_end;
  67 };
  68
  69 static inline struct dev_opts dev_opts_default()
  70 {
  71         return (struct dev_opts) {
  72                 .data_allowed           = ~0U << 2,
  73         };
  74 }
  75
  76 void bch2_pick_bucket_size(struct format_opts, struct dev_opts *);
  77 struct bch_sb *bch2_format(struct format_opts, struct dev_opts *, size_t);
  78
  79 void bch2_super_write(int, struct bch_sb *);
  80 struct bch_sb *__bch2_super_read(int, u64);
  81
  82 void bch2_sb_print(struct bch_sb *, bool, unsigned, enum units);
  83
  84 /* ioctl interface: */
  85
  86 int bcachectl_open(void);
  87
  88 struct bchfs_handle {
  89         uuid_le uuid;
  90         int     ioctl_fd;
  91         int     sysfs_fd;
  92 };
  93
  94 void bcache_fs_close(struct bchfs_handle);
  95 struct bchfs_handle bcache_fs_open(const char *);
  96 struct bchfs_handle bchu_fs_open_by_dev(const char *, unsigned *);
  97
  98 static inline void bchu_disk_add(struct bchfs_handle fs, char *dev)
  99 {
 100         struct bch_ioctl_disk i = { .dev = (__u64) dev, };
 101
 102         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_ADD, &i);
 103 }
 104
 105 static inline void bchu_disk_remove(struct bchfs_handle fs, unsigned dev_idx,
 106                                     unsigned flags)
 107 {
 108         struct bch_ioctl_disk i = {
 109                 .flags  = flags|BCH_BY_INDEX,
 110                 .dev    = dev_idx,
 111         };
 112
 113         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_REMOVE, &i);
 114 }
 115
 116 static inline void bchu_disk_online(struct bchfs_handle fs, char *dev)
 117 {
 118         struct bch_ioctl_disk i = { .dev = (__u64) dev, };
 119
 120         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_ONLINE, &i);
 121 }
 122
 123 static inline void bchu_disk_offline(struct bchfs_handle fs, unsigned dev_idx,
 124                                      unsigned flags)
 125 {
 126         struct bch_ioctl_disk i = {
 127                 .flags  = flags|BCH_BY_INDEX,
 128                 .dev    = dev_idx,
 129         };
 130
 131         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_OFFLINE, &i);
 132 }
 133
 134 static inline void bchu_disk_set_state(struct bchfs_handle fs, unsigned dev,
 135                                        unsigned new_state, unsigned flags)
 136 {
 137         struct bch_ioctl_disk_set_state i = {
 138                 .flags          = flags|BCH_BY_INDEX,
 139                 .new_state      = new_state,
 140                 .dev            = dev,
 141         };
 142
 143         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_SET_STATE, &i);
 144 }
 145
 146 static inline struct bch_ioctl_usage *bchu_usage(struct bchfs_handle fs)
 147 {
 148         struct bch_ioctl_usage *u = NULL;
 149         unsigned nr_devices = 4;
 150
 151         while (1) {
 152                 u = xrealloc(u, sizeof(*u) + sizeof(u->devs[0]) * nr_devices);
 153                 u->nr_devices = nr_devices;
 154
 155                 if (!ioctl(fs.ioctl_fd, BCH_IOCTL_USAGE, u))
 156                         return u;
 157
 158                 if (errno != ENOSPC)
 159                         die("BCH_IOCTL_USAGE error: %m");
 160                 nr_devices *= 2;
 161         }
 162 }
 163
 164 static inline struct bch_sb *bchu_read_super(struct bchfs_handle fs, unsigned idx)
 165 {
 166         size_t size = 4096;
 167         struct bch_sb *sb = NULL;
 168
 169         while (1) {
 170                 sb = xrealloc(sb, size);
 171                 struct bch_ioctl_read_super i = {
 172                         .size   = size,
 173                         .sb     = (u64) sb,
 174                 };
 175
 176                 if (idx != -1) {
 177                         i.flags |= BCH_READ_DEV|BCH_BY_INDEX;
 178                         i.dev = idx;
 179                 }
 180
 181                 if (!ioctl(fs.ioctl_fd, BCH_IOCTL_READ_SUPER, &i))
 182                         return sb;
 183                 if (errno != ERANGE)
 184                         die("BCH_IOCTL_READ_SUPER error: %m");
 185                 size *= 2;
 186         }
 187 }
 188
 189 static inline unsigned bchu_disk_get_idx(struct bchfs_handle fs, dev_t dev)
 190 {
 191         struct bch_ioctl_disk_get_idx i = { .dev = dev };
 192
 193         return xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_GET_IDX, &i);
 194 }
 195
 196 static inline void bchu_disk_resize(struct bchfs_handle fs,
 197                                     unsigned idx,
 198                                     u64 nbuckets)
 199 {
 200         struct bch_ioctl_disk_resize i = {
 201                 .flags  = BCH_BY_INDEX,
 202                 .dev    = idx,
 203                 .nbuckets = nbuckets,
 204         };
 205
 206         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_RESIZE, &i);
 207 }
 208
 209 int bchu_data(struct bchfs_handle, struct bch_ioctl_data);
 210
 211 #endif /* _LIBBCACHE_H */