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_t        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         struct block_device *bdev;
  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 u64 bch2_pick_bucket_size(struct bch_opts, struct dev_opts *);
  79 void bch2_check_bucket_size(struct bch_opts, struct dev_opts *);
  80
  81 struct bch_sb *bch2_format(struct bch_opt_strs,
  82                            struct bch_opts,
  83                            struct format_opts, struct dev_opts *, size_t);
  84
  85 void bch2_super_write(int, struct bch_sb *);
  86 struct bch_sb *__bch2_super_read(int, u64);
  87
  88 /* ioctl interface: */
  89
  90 int bcachectl_open(void);
  91
  92 struct bchfs_handle {
  93         __uuid_t        uuid;
  94         int             ioctl_fd;
  95         int             sysfs_fd;
  96 };
  97
  98 void bcache_fs_close(struct bchfs_handle);
  99 struct bchfs_handle bcache_fs_open(const char *);
 100 struct bchfs_handle bchu_fs_open_by_dev(const char *, int *);
 101 int bchu_dev_path_to_idx(struct bchfs_handle, const char *);
 102
 103 static inline void bchu_disk_add(struct bchfs_handle fs, char *dev)
 104 {
 105         struct bch_ioctl_disk i = { .dev = (unsigned long) dev, };
 106
 107         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_ADD, &i);
 108 }
 109
 110 static inline void bchu_disk_remove(struct bchfs_handle fs, unsigned dev_idx,
 111                                     unsigned flags)
 112 {
 113         struct bch_ioctl_disk i = {
 114                 .flags  = flags|BCH_BY_INDEX,
 115                 .dev    = dev_idx,
 116         };
 117
 118         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_REMOVE, &i);
 119 }
 120
 121 static inline void bchu_disk_online(struct bchfs_handle fs, char *dev)
 122 {
 123         struct bch_ioctl_disk i = { .dev = (unsigned long) dev, };
 124
 125         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_ONLINE, &i);
 126 }
 127
 128 static inline void bchu_disk_offline(struct bchfs_handle fs, unsigned dev_idx,
 129                                      unsigned flags)
 130 {
 131         struct bch_ioctl_disk i = {
 132                 .flags  = flags|BCH_BY_INDEX,
 133                 .dev    = dev_idx,
 134         };
 135
 136         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_OFFLINE, &i);
 137 }
 138
 139 static inline void bchu_disk_set_state(struct bchfs_handle fs, unsigned dev,
 140                                        unsigned new_state, unsigned flags)
 141 {
 142         struct bch_ioctl_disk_set_state i = {
 143                 .flags          = flags|BCH_BY_INDEX,
 144                 .new_state      = new_state,
 145                 .dev            = dev,
 146         };
 147
 148         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_SET_STATE, &i);
 149 }
 150
 151 static inline struct bch_ioctl_fs_usage *bchu_fs_usage(struct bchfs_handle fs)
 152 {
 153         struct bch_ioctl_fs_usage *u = NULL;
 154         size_t replica_entries_bytes = 4096;
 155
 156         while (1) {
 157                 u = xrealloc(u, sizeof(*u) + replica_entries_bytes);
 158                 u->replica_entries_bytes = replica_entries_bytes;
 159
 160                 if (!ioctl(fs.ioctl_fd, BCH_IOCTL_FS_USAGE, u))
 161                         return u;
 162
 163                 if (errno != ERANGE)
 164                         die("BCH_IOCTL_USAGE error: %m");
 165
 166                 replica_entries_bytes *= 2;
 167         }
 168 }
 169
 170 static inline struct bch_ioctl_dev_usage bchu_dev_usage(struct bchfs_handle fs,
 171                                                         unsigned idx)
 172 {
 173         struct bch_ioctl_dev_usage i = { .dev = idx, .flags = BCH_BY_INDEX};
 174
 175         if (xioctl(fs.ioctl_fd, BCH_IOCTL_DEV_USAGE, &i))
 176                 die("BCH_IOCTL_DEV_USAGE error: %m");
 177         return i;
 178 }
 179
 180 static inline struct bch_sb *bchu_read_super(struct bchfs_handle fs, unsigned idx)
 181 {
 182         size_t size = 4096;
 183         struct bch_sb *sb = NULL;
 184
 185         while (1) {
 186                 sb = xrealloc(sb, size);
 187                 struct bch_ioctl_read_super i = {
 188                         .size   = size,
 189                         .sb     = (unsigned long) sb,
 190                 };
 191
 192                 if (idx != -1) {
 193                         i.flags |= BCH_READ_DEV|BCH_BY_INDEX;
 194                         i.dev = idx;
 195                 }
 196
 197                 if (!ioctl(fs.ioctl_fd, BCH_IOCTL_READ_SUPER, &i))
 198                         return sb;
 199                 if (errno != ERANGE)
 200                         die("BCH_IOCTL_READ_SUPER error: %m");
 201                 size *= 2;
 202         }
 203 }
 204
 205 static inline unsigned bchu_disk_get_idx(struct bchfs_handle fs, dev_t dev)
 206 {
 207         struct bch_ioctl_disk_get_idx i = { .dev = dev };
 208
 209         return xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_GET_IDX, &i);
 210 }
 211
 212 static inline void bchu_disk_resize(struct bchfs_handle fs,
 213                                     unsigned idx,
 214                                     u64 nbuckets)
 215 {
 216         struct bch_ioctl_disk_resize i = {
 217                 .flags  = BCH_BY_INDEX,
 218                 .dev    = idx,
 219                 .nbuckets = nbuckets,
 220         };
 221
 222         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_RESIZE, &i);
 223 }
 224
 225 static inline void bchu_disk_resize_journal(struct bchfs_handle fs,
 226                                             unsigned idx,
 227                                             u64 nbuckets)
 228 {
 229         struct bch_ioctl_disk_resize i = {
 230                 .flags  = BCH_BY_INDEX,
 231                 .dev    = idx,
 232                 .nbuckets = nbuckets,
 233         };
 234
 235         xioctl(fs.ioctl_fd, BCH_IOCTL_DISK_RESIZE_JOURNAL, &i);
 236 }
 237
 238 int bchu_data(struct bchfs_handle, struct bch_ioctl_data);
 239
 240 struct dev_name {
 241         unsigned        idx;
 242         char            *dev;
 243         char            *label;
 244         uuid_t          uuid;
 245 };
 246 typedef DARRAY(struct dev_name) dev_names;
 247
 248 dev_names bchu_fs_get_devices(struct bchfs_handle);
 249
 250 #endif /* _LIBBCACHE_H */