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