summaryrefslogtreecommitdiff
path: root/libbcache/inode.c
diff options
context:
space:
mode:
Diffstat (limited to 'libbcache/inode.c')
-rw-r--r--libbcache/inode.c451
1 files changed, 0 insertions, 451 deletions
diff --git a/libbcache/inode.c b/libbcache/inode.c
deleted file mode 100644
index 2e15497f..00000000
--- a/libbcache/inode.c
+++ /dev/null
@@ -1,451 +0,0 @@
-
-#include "bcache.h"
-#include "bkey_methods.h"
-#include "btree_update.h"
-#include "extents.h"
-#include "inode.h"
-#include "io.h"
-#include "keylist.h"
-
-#include <linux/random.h>
-
-#include <asm/unaligned.h>
-
-#define FIELD_BYTES() \
-
-static const u8 byte_table[8] = { 1, 2, 3, 4, 6, 8, 10, 13 };
-static const u8 bits_table[8] = {
- 1 * 8 - 1,
- 2 * 8 - 2,
- 3 * 8 - 3,
- 4 * 8 - 4,
- 6 * 8 - 5,
- 8 * 8 - 6,
- 10 * 8 - 7,
- 13 * 8 - 8,
-};
-
-static int inode_encode_field(u8 *out, u8 *end, const u64 in[2])
-{
- unsigned bytes, bits, shift;
-
- if (likely(!in[1]))
- bits = fls64(in[0]);
- else
- bits = fls64(in[1]) + 64;
-
- for (shift = 1; shift <= 8; shift++)
- if (bits < bits_table[shift - 1])
- goto got_shift;
-
- BUG();
-got_shift:
- bytes = byte_table[shift - 1];
-
- BUG_ON(out + bytes > end);
-
- if (likely(bytes <= 8)) {
- u64 b = cpu_to_be64(in[0]);
-
- memcpy(out, (void *) &b + 8 - bytes, bytes);
- } else {
- u64 b = cpu_to_be64(in[1]);
-
- memcpy(out, (void *) &b + 16 - bytes, bytes);
- put_unaligned_be64(in[0], out + bytes - 8);
- }
-
- *out |= (1 << 8) >> shift;
-
- return bytes;
-}
-
-static int inode_decode_field(const u8 *in, const u8 *end,
- u64 out[2], unsigned *out_bits)
-{
- unsigned bytes, bits, shift;
-
- if (in >= end)
- return -1;
-
- if (!*in)
- return -1;
-
- /*
- * position of highest set bit indicates number of bytes:
- * shift = number of bits to remove in high byte:
- */
- shift = 8 - __fls(*in); /* 1 <= shift <= 8 */
- bytes = byte_table[shift - 1];
- bits = bytes * 8 - shift;
-
- if (in + bytes > end)
- return -1;
-
- /*
- * we're assuming it's safe to deref up to 7 bytes < in; this will work
- * because keys always start quite a bit more than 7 bytes after the
- * start of the btree node header:
- */
- if (likely(bytes <= 8)) {
- out[0] = get_unaligned_be64(in + bytes - 8);
- out[0] <<= 64 - bits;
- out[0] >>= 64 - bits;
- out[1] = 0;
- } else {
- out[0] = get_unaligned_be64(in + bytes - 8);
- out[1] = get_unaligned_be64(in + bytes - 16);
- out[1] <<= 128 - bits;
- out[1] >>= 128 - bits;
- }
-
- *out_bits = out[1] ? 64 + fls64(out[1]) : fls64(out[0]);
- return bytes;
-}
-
-void bch_inode_pack(struct bkey_inode_buf *packed,
- const struct bch_inode_unpacked *inode)
-{
- u8 *out = packed->inode.v.fields;
- u8 *end = (void *) &packed[1];
- u8 *last_nonzero_field = out;
- u64 field[2];
- unsigned nr_fields = 0, last_nonzero_fieldnr = 0;
-
- bkey_inode_init(&packed->inode.k_i);
- packed->inode.k.p.inode = inode->inum;
- packed->inode.v.i_hash_seed = inode->i_hash_seed;
- packed->inode.v.i_flags = cpu_to_le32(inode->i_flags);
- packed->inode.v.i_mode = cpu_to_le16(inode->i_mode);
-
-#define BCH_INODE_FIELD(_name, _bits) \
- field[0] = inode->_name; \
- field[1] = 0; \
- out += inode_encode_field(out, end, field); \
- nr_fields++; \
- \
- if (field[0] | field[1]) { \
- last_nonzero_field = out; \
- last_nonzero_fieldnr = nr_fields; \
- }
-
- BCH_INODE_FIELDS()
-#undef BCH_INODE_FIELD
-
- out = last_nonzero_field;
- nr_fields = last_nonzero_fieldnr;
-
- set_bkey_val_bytes(&packed->inode.k, out - (u8 *) &packed->inode.v);
- memset(out, 0,
- (u8 *) &packed->inode.v +
- bkey_val_bytes(&packed->inode.k) - out);
-
- SET_INODE_NR_FIELDS(&packed->inode.v, nr_fields);
-
- if (IS_ENABLED(CONFIG_BCACHE_DEBUG)) {
- struct bch_inode_unpacked unpacked;
-
- int ret = bch_inode_unpack(inode_i_to_s_c(&packed->inode),
- &unpacked);
- BUG_ON(ret);
- BUG_ON(unpacked.inum != inode->inum);
- BUG_ON(unpacked.i_hash_seed != inode->i_hash_seed);
- BUG_ON(unpacked.i_mode != inode->i_mode);
-
-#define BCH_INODE_FIELD(_name, _bits) BUG_ON(unpacked._name != inode->_name);
- BCH_INODE_FIELDS()
-#undef BCH_INODE_FIELD
- }
-}
-
-int bch_inode_unpack(struct bkey_s_c_inode inode,
- struct bch_inode_unpacked *unpacked)
-{
- const u8 *in = inode.v->fields;
- const u8 *end = (void *) inode.v + bkey_val_bytes(inode.k);
- u64 field[2];
- unsigned fieldnr = 0, field_bits;
- int ret;
-
- unpacked->inum = inode.k->p.inode;
- unpacked->i_hash_seed = inode.v->i_hash_seed;
- unpacked->i_flags = le32_to_cpu(inode.v->i_flags);
- unpacked->i_mode = le16_to_cpu(inode.v->i_mode);
-
-#define BCH_INODE_FIELD(_name, _bits) \
- if (fieldnr++ == INODE_NR_FIELDS(inode.v)) { \
- memset(&unpacked->_name, 0, \
- sizeof(*unpacked) - \
- offsetof(struct bch_inode_unpacked, _name)); \
- return 0; \
- } \
- \
- ret = inode_decode_field(in, end, field, &field_bits); \
- if (ret < 0) \
- return ret; \
- \
- if (field_bits > sizeof(unpacked->_name) * 8) \
- return -1; \
- \
- unpacked->_name = field[0]; \
- in += ret;
-
- BCH_INODE_FIELDS()
-#undef BCH_INODE_FIELD
-
- /* XXX: signal if there were more fields than expected? */
-
- return 0;
-}
-
-static const char *bch_inode_invalid(const struct bch_fs *c,
- struct bkey_s_c k)
-{
- if (k.k->p.offset)
- return "nonzero offset";
-
- switch (k.k->type) {
- case BCH_INODE_FS: {
- struct bkey_s_c_inode inode = bkey_s_c_to_inode(k);
- struct bch_inode_unpacked unpacked;
-
- if (bkey_val_bytes(k.k) < sizeof(struct bch_inode))
- return "incorrect value size";
-
- if (k.k->p.inode < BLOCKDEV_INODE_MAX)
- return "fs inode in blockdev range";
-
- if (INODE_STR_HASH(inode.v) >= BCH_STR_HASH_NR)
- return "invalid str hash type";
-
- if (bch_inode_unpack(inode, &unpacked))
- return "invalid variable length fields";
-
- return NULL;
- }
- case BCH_INODE_BLOCKDEV:
- if (bkey_val_bytes(k.k) != sizeof(struct bch_inode_blockdev))
- return "incorrect value size";
-
- if (k.k->p.inode >= BLOCKDEV_INODE_MAX)
- return "blockdev inode in fs range";
-
- return NULL;
- default:
- return "invalid type";
- }
-}
-
-static void bch_inode_to_text(struct bch_fs *c, char *buf,
- size_t size, struct bkey_s_c k)
-{
- struct bkey_s_c_inode inode;
- struct bch_inode_unpacked unpacked;
-
- switch (k.k->type) {
- case BCH_INODE_FS:
- inode = bkey_s_c_to_inode(k);
- if (bch_inode_unpack(inode, &unpacked)) {
- scnprintf(buf, size, "(unpack error)");
- break;
- }
-
- scnprintf(buf, size, "i_size %llu", unpacked.i_size);
- break;
- }
-}
-
-const struct bkey_ops bch_bkey_inode_ops = {
- .key_invalid = bch_inode_invalid,
- .val_to_text = bch_inode_to_text,
-};
-
-void bch_inode_init(struct bch_fs *c, struct bch_inode_unpacked *inode_u,
- uid_t uid, gid_t gid, umode_t mode, dev_t rdev)
-{
- s64 now = timespec_to_bch_time(c, CURRENT_TIME);
-
- memset(inode_u, 0, sizeof(*inode_u));
-
- /* ick */
- inode_u->i_flags |= c->sb.str_hash_type << INODE_STR_HASH_OFFSET;
- get_random_bytes(&inode_u->i_hash_seed, sizeof(inode_u->i_hash_seed));
-
- inode_u->i_mode = mode;
- inode_u->i_uid = uid;
- inode_u->i_gid = gid;
- inode_u->i_dev = rdev;
- inode_u->i_atime = now;
- inode_u->i_mtime = now;
- inode_u->i_ctime = now;
- inode_u->i_otime = now;
-}
-
-int bch_inode_create(struct bch_fs *c, struct bkey_i *inode,
- u64 min, u64 max, u64 *hint)
-{
- struct btree_iter iter;
- bool searched_from_start = false;
- int ret;
-
- if (!max)
- max = ULLONG_MAX;
-
- if (c->opts.inodes_32bit)
- max = min_t(u64, max, U32_MAX);
-
- if (*hint >= max || *hint < min)
- *hint = min;
-
- if (*hint == min)
- searched_from_start = true;
-again:
- bch_btree_iter_init_intent(&iter, c, BTREE_ID_INODES, POS(*hint, 0));
-
- while (1) {
- struct bkey_s_c k = bch_btree_iter_peek_with_holes(&iter);
-
- ret = btree_iter_err(k);
- if (ret) {
- bch_btree_iter_unlock(&iter);
- return ret;
- }
-
- if (k.k->type < BCH_INODE_FS) {
- inode->k.p = k.k->p;
-
- pr_debug("inserting inode %llu (size %u)",
- inode->k.p.inode, inode->k.u64s);
-
- ret = bch_btree_insert_at(c, NULL, NULL, NULL,
- BTREE_INSERT_ATOMIC,
- BTREE_INSERT_ENTRY(&iter, inode));
-
- if (ret == -EINTR)
- continue;
-
- bch_btree_iter_unlock(&iter);
- if (!ret)
- *hint = k.k->p.inode + 1;
-
- return ret;
- } else {
- if (iter.pos.inode == max)
- break;
- /* slot used */
- bch_btree_iter_advance_pos(&iter);
- }
- }
- bch_btree_iter_unlock(&iter);
-
- if (!searched_from_start) {
- /* Retry from start */
- *hint = min;
- searched_from_start = true;
- goto again;
- }
-
- return -ENOSPC;
-}
-
-int bch_inode_truncate(struct bch_fs *c, u64 inode_nr, u64 new_size,
- struct extent_insert_hook *hook, u64 *journal_seq)
-{
- return bch_discard(c, POS(inode_nr, new_size), POS(inode_nr + 1, 0),
- ZERO_VERSION, NULL, hook, journal_seq);
-}
-
-int bch_inode_rm(struct bch_fs *c, u64 inode_nr)
-{
- struct bkey_i delete;
- int ret;
-
- ret = bch_inode_truncate(c, inode_nr, 0, NULL, NULL);
- if (ret < 0)
- return ret;
-
- ret = bch_btree_delete_range(c, BTREE_ID_XATTRS,
- POS(inode_nr, 0),
- POS(inode_nr + 1, 0),
- ZERO_VERSION, NULL, NULL, NULL);
- if (ret < 0)
- return ret;
-
- /*
- * If this was a directory, there shouldn't be any real dirents left -
- * but there could be whiteouts (from hash collisions) that we should
- * delete:
- *
- * XXX: the dirent could ideally would delete whitouts when they're no
- * longer needed
- */
- ret = bch_btree_delete_range(c, BTREE_ID_DIRENTS,
- POS(inode_nr, 0),
- POS(inode_nr + 1, 0),
- ZERO_VERSION, NULL, NULL, NULL);
- if (ret < 0)
- return ret;
-
- bkey_init(&delete.k);
- delete.k.p.inode = inode_nr;
-
- return bch_btree_insert(c, BTREE_ID_INODES, &delete, NULL,
- NULL, NULL, BTREE_INSERT_NOFAIL);
-}
-
-int bch_inode_find_by_inum(struct bch_fs *c, u64 inode_nr,
- struct bch_inode_unpacked *inode)
-{
- struct btree_iter iter;
- struct bkey_s_c k;
- int ret = -ENOENT;
-
- for_each_btree_key_with_holes(&iter, c, BTREE_ID_INODES,
- POS(inode_nr, 0), k) {
- switch (k.k->type) {
- case BCH_INODE_FS:
- ret = bch_inode_unpack(bkey_s_c_to_inode(k), inode);
- break;
- default:
- /* hole, not found */
- break;
- }
-
- break;
-
- }
-
- return bch_btree_iter_unlock(&iter) ?: ret;
-}
-
-int bch_cached_dev_inode_find_by_uuid(struct bch_fs *c, uuid_le *uuid,
- struct bkey_i_inode_blockdev *ret)
-{
- struct btree_iter iter;
- struct bkey_s_c k;
-
- for_each_btree_key(&iter, c, BTREE_ID_INODES, POS(0, 0), k) {
- if (k.k->p.inode >= BLOCKDEV_INODE_MAX)
- break;
-
- if (k.k->type == BCH_INODE_BLOCKDEV) {
- struct bkey_s_c_inode_blockdev inode =
- bkey_s_c_to_inode_blockdev(k);
-
- pr_debug("found inode %llu: %pU (u64s %u)",
- inode.k->p.inode, inode.v->i_uuid.b,
- inode.k->u64s);
-
- if (CACHED_DEV(inode.v) &&
- !memcmp(uuid, &inode.v->i_uuid, 16)) {
- bkey_reassemble(&ret->k_i, k);
- bch_btree_iter_unlock(&iter);
- return 0;
- }
- }
-
- bch_btree_iter_cond_resched(&iter);
- }
- bch_btree_iter_unlock(&iter);
- return -ENOENT;
-}
generated by cgit v1.2.3 (git 2.46.0) at 2025-08-02 17:27:32 +0000