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 "libbcachefs/opts.h"
  10 #include "libbcachefs/vstructs.h"
  11 #include "tools-util.h"
  12
  13 /* option parsing */
  14
  15 #define SUPERBLOCK_SIZE_DEFAULT         2048    /* 1 MB */
  16
  17 struct bch_opt_strs {
  18 union {
  19         char                    *by_id[bch2_opts_nr];
  20 struct {
  21 #define x(_name, ...)   char    *_name;
  22         BCH_OPTS()
  23 #undef x
  24 };
  25 };
  26 };
  27
  28 void bch2_opt_strs_free(struct bch_opt_strs *);
  29 struct bch_opt_strs bch2_cmdline_opts_get(int *, char *[], unsigned);
  30 struct bch_opts bch2_parse_opts(struct bch_opt_strs);
  31 void bch2_opts_usage(unsigned);
  32
  33 struct format_opts {
  34         char            *label;
  35         uuid_le         uuid;
  36         unsigned        version;
  37         unsigned        superblock_size;
  38         bool            encrypted;
  39         char            *passphrase;
  40 };
  41
  42 static inline struct format_opts format_opts_default()
  43 {
  44         unsigned version = !access(   "/sys/module/bcachefs/parameters/version", R_OK)
  45             ? read_file_u64(AT_FDCWD, "/sys/module/bcachefs/parameters/version")
  46             : bcachefs_metadata_version_current;
  47
  48         return (struct format_opts) {
  49                 .version                = version,
  50                 .superblock_size        = SUPERBLOCK_SIZE_DEFAULT,
  51         };
  52 }
  53
  54 struct dev_opts {
  55         int             fd;
  56         char            *path;
  57         u64             size;           /* bytes*/
  58         u64             bucket_size;    /* bytes */
  59         const char      *label;
  60         unsigned        data_allowed;
  61         unsigned        durability;
  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                 .durability             = 1,
  75         };
  76 }
  77
  78 void bch2_pick_bucket_size(struct bch_opts, struct dev_opts *);
  79 struct bch_sb *bch2_format(struct bch_opt_strs,
  80                            struct bch_opts,
  81                            struct format_opts, struct dev_opts *, size_t);
  82
  83 void bch2_super_write(int, struct bch_sb *);
  84 struct bch_sb *__bch2_super_read(int, u64);
  85
  86 /* ioctl interface: */
  87
  88 int bcachectl_open(void);
  89
  90 struct bchfs_handle {
  91         uuid_le uuid;
  92         int     ioctl_fd;
  93         int     sysfs_fd;
  94 };
  95
  96 void bcache_fs_close(struct bchfs_handle);
  97 struct bchfs_handle bcache_fs_open(const char *);
  98 struct bchfs_handle bchu_fs_open_by_dev(const char *, int *);
  99 int bchu_dev_path_to_idx(struct bchfs_handle, const char *);
 100
 101 static inline void bchu_disk_add(struct bchfs_handle fs, char *dev)
 102 {
 103         struct bch_ioctl_disk i = { .dev = (unsigned long) dev, };
 104
 105         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_ADD, &i);
 106 }
 107
 108 static inline void bchu_disk_remove(struct bchfs_handle fs, unsigned dev_idx,
 109                                     unsigned flags)
 110 {
 111         struct bch_ioctl_disk i = {
 112                 .flags  = flags|BCH_BY_INDEX,
 113                 .dev    = dev_idx,
 114         };
 115
 116         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_REMOVE, &i);
 117 }
 118
 119 static inline void bchu_disk_online(struct bchfs_handle fs, char *dev)
 120 {
 121         struct bch_ioctl_disk i = { .dev = (unsigned long) dev, };
 122
 123         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_ONLINE, &i);
 124 }
 125
 126 static inline void bchu_disk_offline(struct bchfs_handle fs, unsigned dev_idx,
 127                                      unsigned flags)
 128 {
 129         struct bch_ioctl_disk i = {
 130                 .flags  = flags|BCH_BY_INDEX,
 131                 .dev    = dev_idx,
 132         };
 133
 134         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_OFFLINE, &i);
 135 }
 136
 137 static inline void bchu_disk_set_state(struct bchfs_handle fs, unsigned dev,
 138                                        unsigned new_state, unsigned flags)
 139 {
 140         struct bch_ioctl_disk_set_state i = {
 141                 .flags          = flags|BCH_BY_INDEX,
 142                 .new_state      = new_state,
 143                 .dev            = dev,
 144         };
 145
 146         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_SET_STATE, &i);
 147 }
 148
 149 static inline struct bch_ioctl_fs_usage *bchu_fs_usage(struct bchfs_handle fs)
 150 {
 151         struct bch_ioctl_fs_usage *u = NULL;
 152         size_t replica_entries_bytes = 4096;
 153
 154         while (1) {
 155                 u = xrealloc(u, sizeof(*u) + replica_entries_bytes);
 156                 u->replica_entries_bytes = replica_entries_bytes;
 157
 158                 if (!ioctl(fs.ioctl_fd, BCH_IOCTL_FS_USAGE, u))
 159                         return u;
 160
 161                 if (errno != ERANGE)
 162                         die("BCH_IOCTL_USAGE error: %m");
 163
 164                 replica_entries_bytes *= 2;
 165         }
 166 }
 167
 168 static inline struct bch_ioctl_dev_usage bchu_dev_usage(struct bchfs_handle fs,
 169                                                         unsigned idx)
 170 {
 171         struct bch_ioctl_dev_usage i = { .dev = idx, .flags = BCH_BY_INDEX};
 172
 173         if (xioctl(fs.ioctl_fd, BCH_IOCTL_DEV_USAGE, &i))
 174                 die("BCH_IOCTL_DEV_USAGE error: %m");
 175         return i;
 176 }
 177
 178 static inline struct bch_sb *bchu_read_super(struct bchfs_handle fs, unsigned idx)
 179 {
 180         size_t size = 4096;
 181         struct bch_sb *sb = NULL;
 182
 183         while (1) {
 184                 sb = xrealloc(sb, size);
 185                 struct bch_ioctl_read_super i = {
 186                         .size   = size,
 187                         .sb     = (unsigned long) sb,
 188                 };
 189
 190                 if (idx != -1) {
 191                         i.flags |= BCH_READ_DEV|BCH_BY_INDEX;
 192                         i.dev = idx;
 193                 }
 194
 195                 if (!ioctl(fs.ioctl_fd, BCH_IOCTL_READ_SUPER, &i))
 196                         return sb;
 197                 if (errno != ERANGE)
 198                         die("BCH_IOCTL_READ_SUPER error: %m");
 199                 size *= 2;
 200         }
 201 }
 202
 203 static inline unsigned bchu_disk_get_idx(struct bchfs_handle fs, dev_t dev)
 204 {
 205         struct bch_ioctl_disk_get_idx i = { .dev = dev };
 206
 207         return xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_GET_IDX, &i);
 208 }
 209
 210 static inline void bchu_disk_resize(struct bchfs_handle fs,
 211                                     unsigned idx,
 212                                     u64 nbuckets)
 213 {
 214         struct bch_ioctl_disk_resize i = {
 215                 .flags  = BCH_BY_INDEX,
 216                 .dev    = idx,
 217                 .nbuckets = nbuckets,
 218         };
 219
 220         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_RESIZE, &i);
 221 }
 222
 223 static inline void bchu_disk_resize_journal(struct bchfs_handle fs,
 224                                             unsigned idx,
 225                                             u64 nbuckets)
 226 {
 227         struct bch_ioctl_disk_resize i = {
 228                 .flags  = BCH_BY_INDEX,
 229                 .dev    = idx,
 230                 .nbuckets = nbuckets,
 231         };
 232
 233         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_RESIZE_JOURNAL, &i);
 234 }
 235
 236 int bchu_data(struct bchfs_handle, struct bch_ioctl_data);
 237
 238 struct dev_name {
 239         unsigned        idx;
 240         char            *dev;
 241         char            *label;
 242         uuid_le         uuid;
 243 };
 244 typedef DARRAY(struct dev_name) dev_names;
 245
 246 dev_names bchu_fs_get_devices(struct bchfs_handle);
 247
 248 #endif /* _LIBBCACHE_H */