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WIP added callbacks for stuff

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This commit is contained in:
Christopher Haster
2018-03-11 11:28:13 -05:00
parent 96cca2f5b6
commit 3a10f5c29b
1 changed files with 151 additions and 123 deletions
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274
lfs.c
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@@ -474,30 +474,85 @@ static int lfs_dir_fetch(lfs_t *lfs,
return 0;
}
struct lfs_region {
enum {
LFS_FROM_MEM,
LFS_FROM_DISK,
} source;
struct lfs_commit {
uint32_t crc;
lfs_block_t block;
lfs_off_t off;
};
static int lfs_commit(lfs_t *lfs, struct lfs_commit *c, const void *data, lfs_size_t size) {
lfs_crc(&c->crc, data, size);
int err = lfs_bd_prog(lfs, c->block, c->off, data, size);
c->off += size;
return err;
}
struct lfs_region {
lfs_off_t off;
lfs_ssize_t diff;
union {
struct {
const void *data;
} m;
struct {
lfs_block_t block;
lfs_off_t off;
} d;
} u;
lfs_size_t len;
int (*commit)(lfs_t *lfs, struct lfs_commit *c, const void *p);
const void *data;
struct lfs_region *next;
};
struct lfs_commit_mem {
const void *data;
lfs_size_t size;
};
static int lfs_commit_mem(lfs_t *lfs, struct lfs_commit *c, const void *p) {
const struct lfs_commit_mem *m = p;
return lfs_commit(lfs, c, m->data, m->size);
}
struct lfs_commit_disk {
lfs_block_t block;
lfs_off_t off;
lfs_size_t size;
struct lfs_region *regions;
};
static int lfs_commit_disk(lfs_t *lfs, struct lfs_commit *c, const void *p) {
const struct lfs_commit_disk *u = p;
struct lfs_region *r = u->regions;
lfs_off_t off = 0;
while (true) {
if (r && r->off == off) {
lfs_off_t orig = c->off;
int err = r->commit(lfs, c, r->data);
if (err) {
return err;
}
off += (c->off - orig) - r->diff;
r = r->next;
} else if (off < u->size) {
uint8_t data;
int err = lfs_bd_read(lfs, u->block, u->off + off, &data, 1);
if (err) {
return err;
}
err = lfs_commit(lfs, c, &data, 1);
if (err) {
return err;
}
off += 1;
} else {
return 0;
}
}
}
static int lfs_dir_commit(lfs_t *lfs, lfs_dir_t *dir,
struct lfs_region *regions) {
// state for copying over
const lfs_block_t oldpair[2] = {dir->pair[1], dir->pair[0]};
lfs_size_t oldsize = (0x7fffffff & dir->d.size) - 4;
bool relocated = false;
// increment revision count
dir->d.rev += 1;
@@ -507,9 +562,6 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_dir_t *dir,
dir->d.size += r->diff;
}
const lfs_block_t oldpair[2] = {dir->pair[0], dir->pair[1]};
bool relocated = false;
while (true) {
if (true) {
int err = lfs_bd_erase(lfs, dir->pair[0]);
@@ -520,10 +572,20 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_dir_t *dir,
return err;
}
uint32_t crc = 0xffffffff;
struct lfs_commit c = {
.crc = 0xffffffff,
.block = dir->pair[0],
.off = 0,
};
lfs_dir_tole32(&dir->d);
lfs_crc(&crc, &dir->d, sizeof(dir->d));
err = lfs_bd_prog(lfs, dir->pair[0], 0, &dir->d, sizeof(dir->d));
err = lfs_commit_disk(lfs, &c, &(struct lfs_commit_disk){
oldpair[1], 0, oldsize,
&(struct lfs_region){
0, 0,
lfs_commit_mem, &(struct lfs_commit_mem){
&dir->d, sizeof(dir->d)},
regions}});
lfs_dir_fromle32(&dir->d);
if (err) {
if (err == LFS_ERR_CORRUPT) {
@@ -532,54 +594,9 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_dir_t *dir,
return err;
}
struct lfs_region *r = regions;
int j = 0;
lfs_off_t oldoff = sizeof(dir->d);
lfs_off_t newoff = sizeof(dir->d);
while (newoff < (0x7fffffff & dir->d.size)-4) {
while (r && r->off == oldoff && r->len == j) {
oldoff += r->len - r->diff;
r = r->next;
j = 0;
}
uint8_t data;
if (r && r->off == oldoff) {
if (r->source == LFS_FROM_DISK) {
err = lfs_bd_read(lfs, r->u.d.block,
r->u.d.off + j, &data, 1);
if (err) {
return err;
}
} else {
data = ((const uint8_t *)r->u.m.data)[j];
}
j += 1;
} else {
err = lfs_bd_read(lfs, oldpair[1], oldoff, &data, 1);
if (err) {
return err;
}
oldoff += 1;
}
lfs_crc(&crc, &data, 1);
err = lfs_bd_prog(lfs, dir->pair[0], newoff, &data, 1);
if (err) {
if (err == LFS_ERR_CORRUPT) {
goto relocate;
}
return err;
}
newoff += 1;
}
crc = lfs_tole32(crc);
err = lfs_bd_prog(lfs, dir->pair[0], newoff, &crc, 4);
crc = lfs_fromle32(crc);
c.crc = lfs_tole32(c.crc);
err = lfs_bd_prog(lfs, dir->pair[0], c.off, &c.crc, 4);
c.crc = lfs_fromle32(c.crc);
if (err) {
if (err == LFS_ERR_CORRUPT) {
goto relocate;
@@ -603,12 +620,13 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_dir_t *dir,
return err;
}
if (ncrc != crc) {
if (ncrc != c.crc) {
goto relocate;
}
}
break;
relocate:
//commit was corrupted
LFS_DEBUG("Bad block at %d", dir->pair[0]);
@@ -699,14 +717,10 @@ static int lfs_dir_append(lfs_t *lfs, lfs_dir_t *dir,
static int lfs_dir_update(lfs_t *lfs, lfs_dir_t *dir,
lfs_entry_t *entry, struct lfs_region *regions) {
lfs_off_t oldoff = entry->off;
lfs_off_t oldoff = entry->off; // <- TODO rm me?
lfs_ssize_t diff = 0;
lfs_size_t len = 0;
struct lfs_region **tail = &regions;
for (struct lfs_region *r = regions; r; r = r->next) {
diff += r->diff;
len += r->len;
tail = &r->next;
}
// do we still fit?
@@ -721,45 +735,44 @@ static int lfs_dir_update(lfs_t *lfs, lfs_dir_t *dir,
}
} else {
lfs_dir_t olddir = *dir;
lfs_off_t oldoff = entry->off;
lfs_size_t oldsize = lfs_entry_size(entry) - diff;
// mark as moving
entry->d.type |= LFS_STRUCT_MOVED;
int err = lfs_dir_commit(lfs, &olddir,
&(struct lfs_region){
LFS_FROM_MEM, oldoff, 0,
{.m.data = &entry->d.type}, 1});
oldoff, 0,
lfs_commit_mem, &(struct lfs_commit_mem){
&entry->d.type, 1}});
if (err) {
return err;
}
// append updated entry
entry->d.type &= LFS_STRUCT_MOVED;
lfs_size_t prefix = regions->off;
lfs_size_t suffix = lfs_entry_size(entry) - len - 4;
for (struct lfs_region *r = regions; r; r = r->next) {
r->off = 0;
r->diff = r->len;
err = lfs_dir_append(lfs, dir, entry,
&(struct lfs_region){
0, +lfs_entry_size(entry),
lfs_commit_disk, &(struct lfs_commit_disk){
olddir.pair[0], entry->off, oldsize, regions}});
if (err) {
return err;
}
regions = &(struct lfs_region){
LFS_FROM_DISK, 0, +prefix,
{.d.block = olddir.pair[0], .d.off = entry->off},
prefix, regions};
*tail = &(struct lfs_region){
LFS_FROM_DISK, 0, +suffix,
{.d.block = olddir.pair[0], .d.off = entry->off+prefix+len},
suffix};
// remove old entry
err = lfs_dir_commit(lfs, &olddir,
&(struct lfs_region){
LFS_FROM_MEM, oldoff, -(lfs_entry_size(entry) - diff),
{.m.data = NULL}, 0});
oldoff, -oldsize,
lfs_commit_mem, &(struct lfs_commit_mem){
NULL, 0}});
if (err) {
return err;
}
}
// TODO move to dir_commit?
// TODO this doesn't work...
// shift over any files/directories that are affected
for (lfs_file_t *f = lfs->files; f; f = f->next) {
if (lfs_paircmp(f->pair, dir->pair) == 0) {
@@ -802,9 +815,11 @@ static int lfs_dir_remove(lfs_t *lfs, lfs_dir_t *dir, lfs_entry_t *entry) {
}
// shift out the entry
int err = lfs_dir_commit(lfs, dir, &(struct lfs_region){
LFS_FROM_MEM, entry->off, -lfs_entry_size(entry),
{.m.data = NULL}, 0});
int err = lfs_dir_commit(lfs, dir,
&(struct lfs_region){
entry->off, -lfs_entry_size(entry),
lfs_commit_mem, &(struct lfs_commit_mem){
NULL, 0}});
if (err) {
return err;
}
@@ -1026,11 +1041,13 @@ int lfs_mkdir(lfs_t *lfs, const char *path) {
err = lfs_dir_append(lfs, &cwd, &entry,
&(struct lfs_region){
LFS_FROM_MEM, 0, +sizeof(entry.d),
{.m.data = &entry.d}, sizeof(entry.d),
0, +sizeof(entry.d),
lfs_commit_mem, &(struct lfs_commit_mem){
&entry.d, sizeof(entry.d)},
&(struct lfs_region){
LFS_FROM_MEM, 0, +entry.d.nlen,
{.m.data = path}, entry.d.nlen}});
0, +entry.d.nlen,
lfs_commit_mem, &(struct lfs_commit_mem){
path, entry.d.nlen}}});
if (err) {
return err;
}
@@ -1416,11 +1433,13 @@ int lfs_file_open(lfs_t *lfs, lfs_file_t *file,
entry.d.u.file.size = 0;
err = lfs_dir_append(lfs, &cwd, &entry,
&(struct lfs_region){
LFS_FROM_MEM, 0, +sizeof(entry.d),
{.m.data = &entry.d}, sizeof(entry.d),
0, +sizeof(entry.d),
lfs_commit_mem, &(struct lfs_commit_mem){
&entry.d, sizeof(entry.d)},
&(struct lfs_region){
LFS_FROM_MEM, 0, +entry.d.nlen,
{.m.data = path}, entry.d.nlen}});
0, +entry.d.nlen,
lfs_commit_mem, &(struct lfs_commit_mem){
path, entry.d.nlen}}});
if (err) {
return err;
}
@@ -1638,8 +1657,9 @@ int lfs_file_sync(lfs_t *lfs, lfs_file_t *file) {
err = lfs_dir_update(lfs, &cwd, &entry,
&(struct lfs_region){
LFS_FROM_MEM, 0, 0,
{.m.data = &entry.d}, sizeof(entry.d)});
0, 0,
lfs_commit_mem, &(struct lfs_commit_mem){
&entry.d, sizeof(entry.d)}});
if (err) {
return err;
}
@@ -2063,8 +2083,9 @@ int lfs_rename(lfs_t *lfs, const char *oldpath, const char *newpath) {
oldentry.d.type |= LFS_STRUCT_MOVED;
err = lfs_dir_update(lfs, &oldcwd, &oldentry,
&(struct lfs_region){
LFS_FROM_MEM, 0, 0,
{.m.data = &oldentry.d}, sizeof(oldentry.d)});
0, 0,
lfs_commit_mem, &(struct lfs_commit_mem){
&oldentry.d, sizeof(oldentry.d)}});
if (err) {
return err;
}
@@ -2083,22 +2104,26 @@ int lfs_rename(lfs_t *lfs, const char *oldpath, const char *newpath) {
if (prevexists) {
err = lfs_dir_update(lfs, &newcwd, &newentry,
&(struct lfs_region){
LFS_FROM_MEM, 0, 0,
{.m.data = &newentry.d}, sizeof(newentry.d),
0, 0,
lfs_commit_mem, &(struct lfs_commit_mem){
&newentry.d, sizeof(newentry.d)},
&(struct lfs_region){
LFS_FROM_MEM, sizeof(newentry.d), 0,
{.m.data = newpath}, newentry.d.nlen}});
sizeof(newentry.d), 0,
lfs_commit_mem, &(struct lfs_commit_mem){
newpath, newentry.d.nlen}}});
if (err) {
return err;
}
} else {
err = lfs_dir_append(lfs, &newcwd, &newentry,
&(struct lfs_region){
LFS_FROM_MEM, 0, +sizeof(newentry.d),
{.m.data = &newentry.d}, sizeof(newentry.d),
0, +sizeof(newentry.d),
lfs_commit_mem, &(struct lfs_commit_mem){
&newentry.d, sizeof(newentry.d)},
&(struct lfs_region){
LFS_FROM_MEM, 0, +newentry.d.nlen,
{.m.data = newpath}, newentry.d.nlen}});
0, +newentry.d.nlen,
lfs_commit_mem, &(struct lfs_commit_mem){
newpath, newentry.d.nlen}}});
if (err) {
return err;
}
@@ -2265,8 +2290,9 @@ int lfs_format(lfs_t *lfs, const struct lfs_config *cfg) {
bool valid = false;
for (int i = 0; i < 2; i++) {
err = lfs_dir_commit(lfs, &superdir, &(struct lfs_region){
LFS_FROM_MEM, sizeof(superdir.d), 0,
{.m.data = &superblock.d}, sizeof(superblock.d)});
sizeof(superdir.d), 0,
lfs_commit_mem, &(struct lfs_commit_mem){
&superblock.d, sizeof(superblock.d)}});
if (err && err != LFS_ERR_CORRUPT) {
return err;
}
@@ -2532,8 +2558,9 @@ static int lfs_relocate(lfs_t *lfs,
int err = lfs_dir_update(lfs, &parent, &entry,
&(struct lfs_region){
LFS_FROM_MEM, 0, 0,
{.m.data = &entry.d}, sizeof(entry.d)});
0, 0,
lfs_commit_mem, &(struct lfs_commit_mem){
&entry.d, sizeof(entry.d)}});
if (err) {
return err;
}
@@ -2659,8 +2686,9 @@ int lfs_deorphan(lfs_t *lfs) {
entry.d.type &= ~LFS_STRUCT_MOVED;
err = lfs_dir_update(lfs, &cwd, &entry,
&(struct lfs_region){
LFS_FROM_MEM, 0, 0,
{.m.data = &entry.d}, sizeof(entry.d)});
0, 0,
lfs_commit_mem, &(struct lfs_commit_mem){
&entry.d, sizeof(entry.d)}});
if (err) {
return err;
}