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WIP Changed deorphan to only use one pass for pred fix

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This commit is contained in:
Christopher Haster
2018-08-13 09:03:13 -05:00
parent 4264b28aa3
commit 9819ba24e8
2 changed files with 82 additions and 80 deletions
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153
lfs.c
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@@ -451,31 +451,32 @@ static inline void lfs_global_zero(lfs_global_t *a) {
}
static inline void lfs_global_fromle32(lfs_global_t *a) {
lfs_pair_fromle32(a->s.movepair);
a->s.moveid = lfs_fromle16(a->s.moveid);
lfs_pair_fromle32(a->l.movepair);
a->l.moveid = lfs_fromle16(a->l.moveid);
}
static inline void lfs_global_tole32(lfs_global_t *a) {
lfs_pair_tole32(a->s.movepair);
a->s.moveid = lfs_tole16(a->s.moveid);
lfs_pair_tole32(a->l.movepair);
a->l.moveid = lfs_tole16(a->l.moveid);
}
static inline void lfs_global_move(lfs_t *lfs,
const lfs_block_t pair[2], uint16_t id) {
lfs_global_t diff;
lfs_global_zero(&diff);
diff.s.movepair[0] ^= lfs->globals.s.movepair[0] ^ pair[0];
diff.s.movepair[1] ^= lfs->globals.s.movepair[1] ^ pair[1];
diff.s.moveid ^= lfs->globals.s.moveid ^ id;
diff.l.movepair[0] ^= lfs->globals.g.movepair[0] ^ pair[0];
diff.l.movepair[1] ^= lfs->globals.g.movepair[1] ^ pair[1];
diff.l.moveid ^= lfs->globals.g.moveid ^ id;
lfs_global_fromle32(&lfs->locals);
lfs_global_xor(&lfs->locals, &diff);
lfs_global_tole32(&lfs->locals);
lfs_global_xor(&lfs->globals, &diff);
}
static inline void lfs_global_deorphaned(lfs_t *lfs, bool deorphaned) {
lfs->locals.s.deorphaned ^= lfs->globals.s.deorphaned ^ deorphaned;
lfs->globals.s.deorphaned ^= lfs->globals.s.deorphaned ^ deorphaned;
static inline void lfs_global_orphans(lfs_t *lfs, int8_t orphans) {
lfs->locals.l.deorphaned ^= (lfs->globals.g.orphans == 0);
lfs->locals.l.deorphaned ^= (lfs->globals.g.orphans + orphans == 0);
lfs->globals.g.orphans += orphans;
}
@@ -688,7 +689,7 @@ static int lfs_commit_globals(lfs_t *lfs, struct lfs_commit *commit,
lfs_global_xor(locals, &lfs->locals);
int err = lfs_commit_attr(lfs, commit,
LFS_MKTAG(LFS_TYPE_GLOBALS + locals->s.deorphaned, 0x3ff, 10),
LFS_MKTAG(LFS_TYPE_GLOBALS + locals->l.deorphaned, 0x3ff, 10),
locals);
lfs_global_xor(locals, &lfs->locals);
return err;
@@ -907,7 +908,7 @@ static int32_t lfs_dir_fetchmatch(lfs_t *lfs,
}
lfs_pair_fromle32(temptail);
} else if (lfs_tag_subtype(tag) == LFS_TYPE_GLOBALS) {
templocals.s.deorphaned = (lfs_tag_type(tag) & 1);
templocals.l.deorphaned = (lfs_tag_type(tag) & 1);
err = lfs_bd_read(lfs, dir->pair[0], off+sizeof(tag),
&templocals, 10);
if (err) {
@@ -973,11 +974,11 @@ static int32_t lfs_dir_fetchmatch(lfs_t *lfs,
// consider what we have good enough
if (dir->off > 0) {
// synthetic move
if (lfs_pair_cmp(dir->pair, lfs->globals.s.movepair) == 0) {
if (lfs->globals.s.moveid == lfs_tag_id(foundtag)) {
if (lfs_pair_cmp(dir->pair, lfs->globals.g.movepair) == 0) {
if (lfs->globals.g.moveid == lfs_tag_id(foundtag)) {
foundtag = LFS_ERR_NOENT;
} else if (lfs_tag_isvalid(foundtag) &&
lfs->globals.s.moveid < lfs_tag_id(foundtag)) {
lfs->globals.g.moveid < lfs_tag_id(foundtag)) {
foundtag -= LFS_MKTAG(0, 1, 0);
}
}
@@ -1026,8 +1027,8 @@ static int32_t lfs_dir_find(lfs_t *lfs,
static int32_t lfs_dir_get(lfs_t *lfs, lfs_mdir_t *dir,
uint32_t getmask, uint32_t gettag, void *buffer) {
int32_t getdiff = 0;
if (lfs_pair_cmp(dir->pair, lfs->globals.s.movepair) == 0 &&
lfs_tag_id(gettag) <= lfs->globals.s.moveid) {
if (lfs_pair_cmp(dir->pair, lfs->globals.g.movepair) == 0 &&
lfs_tag_id(gettag) <= lfs->globals.g.moveid) {
// synthetic moves
getdiff = LFS_MKTAG(0, 1, 0);
}
@@ -1270,17 +1271,17 @@ static int lfs_dir_commit(lfs_t *lfs, lfs_mdir_t *dir,
lfs_mattr_t cancelattr;
lfs_global_t canceldiff;
lfs_global_zero(&canceldiff);
if (lfs_pair_cmp(dir->pair, lfs->globals.s.movepair) == 0) {
if (lfs_pair_cmp(dir->pair, lfs->globals.g.movepair) == 0) {
// Wait, we have the move? Just cancel this out here
// We need to, or else the move can become outdated
canceldiff.s.movepair[0] ^= lfs->globals.s.movepair[0] ^ 0xffffffff;
canceldiff.s.movepair[1] ^= lfs->globals.s.movepair[1] ^ 0xffffffff;
canceldiff.s.moveid ^= lfs->globals.s.moveid ^ 0x3ff;
canceldiff.l.movepair[0] ^= lfs->globals.g.movepair[0] ^ 0xffffffff;
canceldiff.l.movepair[1] ^= lfs->globals.g.movepair[1] ^ 0xffffffff;
canceldiff.l.moveid ^= lfs->globals.g.moveid ^ 0x3ff;
lfs_global_fromle32(&lfs->locals);
lfs_global_xor(&lfs->locals, &canceldiff);
lfs_global_tole32(&lfs->locals);
cancelattr.tag = LFS_MKTAG(LFS_TYPE_DELETE, lfs->globals.s.moveid, 0);
cancelattr.tag = LFS_MKTAG(LFS_TYPE_DELETE, lfs->globals.l.moveid, 0);
cancelattr.next = attrs;
attrs = &cancelattr;
}
@@ -2636,7 +2637,7 @@ int lfs_remove(lfs_t *lfs, const char *path) {
}
// mark fs as orphaned
lfs_global_deorphaned(lfs, false);
lfs_global_orphans(lfs, +1);
}
// delete the entry
@@ -2648,14 +2649,14 @@ int lfs_remove(lfs_t *lfs, const char *path) {
}
if (lfs_tag_type(tag) == LFS_TYPE_DIR) {
// fix orphan
lfs_global_orphans(lfs, -1);
err = lfs_fs_pred(lfs, dir.pair, &cwd);
if (err) {
return err;
}
// fix orphan
lfs_global_deorphaned(lfs, true);
// steal state
cwd.tail[0] = dir.tail[0];
cwd.tail[1] = dir.tail[1];
@@ -2696,36 +2697,7 @@ int lfs_rename(lfs_t *lfs, const char *oldpath, const char *newpath) {
uint16_t newid = lfs_tag_id(prevtag);
lfs_mdir_t prevdir;
if (prevtag != LFS_ERR_NOENT) {
// check that we have same type
if (lfs_tag_type(prevtag) != lfs_tag_type(oldtag)) {
return LFS_ERR_ISDIR;
}
if (lfs_tag_type(prevtag) == LFS_TYPE_DIR) {
// must be empty before removal
lfs_block_t prevpair[2];
int32_t res = lfs_dir_get(lfs, &newcwd, 0x7c3ff000,
LFS_MKTAG(LFS_TYPE_STRUCT, newid, 8), prevpair);
if (res < 0) {
return res;
}
lfs_pair_fromle32(prevpair);
// must be empty before removal
err = lfs_dir_fetch(lfs, &prevdir, prevpair);
if (err) {
return err;
}
if (prevdir.count > 0 || prevdir.split) {
return LFS_ERR_NOTEMPTY;
}
// mark fs as orphaned
lfs_global_deorphaned(lfs, false);
}
} else {
if (prevtag == LFS_ERR_NOENT) {
// check that name fits
lfs_size_t nlen = strlen(newpath);
if (nlen > lfs->name_max) {
@@ -2734,6 +2706,30 @@ int lfs_rename(lfs_t *lfs, const char *oldpath, const char *newpath) {
// get next id
newid = newcwd.count;
} else if (lfs_tag_type(prevtag) != lfs_tag_type(oldtag)) {
return LFS_ERR_ISDIR;
} else if (lfs_tag_type(prevtag) == LFS_TYPE_DIR) {
// must be empty before removal
lfs_block_t prevpair[2];
int32_t res = lfs_dir_get(lfs, &newcwd, 0x7c3ff000,
LFS_MKTAG(LFS_TYPE_STRUCT, newid, 8), prevpair);
if (res < 0) {
return res;
}
lfs_pair_fromle32(prevpair);
// must be empty before removal
err = lfs_dir_fetch(lfs, &prevdir, prevpair);
if (err) {
return err;
}
if (prevdir.count > 0 || prevdir.split) {
return LFS_ERR_NOTEMPTY;
}
// mark fs as orphaned
lfs_global_orphans(lfs, +1);
}
// create move to fix later
@@ -2758,14 +2754,14 @@ int lfs_rename(lfs_t *lfs, const char *oldpath, const char *newpath) {
}
if (prevtag != LFS_ERR_NOENT && lfs_tag_type(prevtag) == LFS_TYPE_DIR) {
// fix orphan
lfs_global_orphans(lfs, -1);
err = lfs_fs_pred(lfs, prevdir.pair, &newcwd);
if (err) {
return err;
}
// fix orphan
lfs_global_deorphaned(lfs, true);
// steal state
newcwd.tail[0] = prevdir.tail[0];
newcwd.tail[1] = prevdir.tail[1];
@@ -2917,10 +2913,10 @@ static int lfs_init(lfs_t *lfs, const struct lfs_config *cfg) {
lfs->root[1] = 0xffffffff;
lfs->mlist = NULL;
lfs->seed = 0;
lfs->globals.s.movepair[0] = 0xffffffff;
lfs->globals.s.movepair[1] = 0xffffffff;
lfs->globals.s.moveid = 0x3ff;
lfs->globals.s.deorphaned = true;
lfs->globals.g.movepair[0] = 0xffffffff;
lfs->globals.g.movepair[1] = 0xffffffff;
lfs->globals.g.moveid = 0x3ff;
lfs->globals.g.orphans = 0;
lfs_global_zero(&lfs->locals);
return 0;
@@ -3089,11 +3085,11 @@ int lfs_mount(lfs_t *lfs, const struct lfs_config *cfg) {
lfs_global_fromle32(&lfs->locals);
lfs_global_xor(&lfs->globals, &lfs->locals);
lfs_global_zero(&lfs->locals);
if (!lfs_pair_isnull(lfs->globals.s.movepair)) {
if (!lfs_pair_isnull(lfs->globals.g.movepair)) {
LFS_DEBUG("Found move %"PRIu32" %"PRIu32" %"PRIu32,
lfs->globals.s.movepair[0],
lfs->globals.s.movepair[1],
lfs->globals.s.moveid);
lfs->globals.g.movepair[0],
lfs->globals.g.movepair[1],
lfs->globals.g.moveid);
}
// setup free lookahead
@@ -3254,7 +3250,8 @@ static int lfs_fs_relocate(lfs_t *lfs,
if (tag != LFS_ERR_NOENT) {
// update disk, this creates a desync
lfs_global_deorphaned(lfs, false);
lfs_global_orphans(lfs, +1);
lfs_pair_tole32(newpair);
int err = lfs_dir_commit(lfs, &parent,
&(lfs_mattr_t){.tag=tag, .buffer=newpair});
@@ -3263,8 +3260,8 @@ static int lfs_fs_relocate(lfs_t *lfs,
return err;
}
// clean up bad block, which should now be a desync
return lfs_fs_deorphan(lfs);
// next step, clean up orphans
lfs_global_orphans(lfs, -1);
}
// find pred
@@ -3275,7 +3272,7 @@ static int lfs_fs_relocate(lfs_t *lfs,
// if we can't find dir, it must be new
if (err != LFS_ERR_NOENT) {
// just replace bad pair, no desync can occur
// replace bad pair, either we clean up desync, or no desync occured
parent.tail[0] = newpair[0];
parent.tail[1] = newpair[1];
err = lfs_dir_commit(lfs, &parent,
@@ -3359,20 +3356,20 @@ static int lfs_fs_deorphan(lfs_t *lfs) {
}
// mark orphans as fixed
lfs_global_deorphaned(lfs, true);
lfs_global_orphans(lfs, -lfs->globals.g.orphans);
return 0;
}
static int lfs_fs_demove(lfs_t *lfs) {
// Fix bad moves
LFS_DEBUG("Fixing move %"PRIu32" %"PRIu32" %"PRIu32,
lfs->globals.s.movepair[0],
lfs->globals.s.movepair[1],
lfs->globals.s.moveid);
lfs->globals.g.movepair[0],
lfs->globals.g.movepair[1],
lfs->globals.g.moveid);
// fetch and delete the moved entry
lfs_mdir_t movedir;
int err = lfs_dir_fetch(lfs, &movedir, lfs->globals.s.movepair);
int err = lfs_dir_fetch(lfs, &movedir, lfs->globals.g.movepair);
if (err) {
return err;
}
@@ -3387,14 +3384,14 @@ static int lfs_fs_demove(lfs_t *lfs) {
}
static int lfs_fs_forceconsistency(lfs_t *lfs) {
if (!lfs->globals.s.deorphaned) {
if (lfs->globals.g.orphans) {
int err = lfs_fs_deorphan(lfs);
if (err) {
return err;
}
}
if (lfs->globals.s.moveid != 0x3ff) {
if (lfs->globals.g.moveid != 0x3ff) {
int err = lfs_fs_demove(lfs);
if (err) {
return err;

9
lfs.h
View File

@@ -302,8 +302,13 @@ typedef union lfs_global {
struct {
lfs_block_t movepair[2];
uint16_t moveid;
bool deorphaned;
} s;
uint8_t deorphaned;
} l;
struct {
lfs_block_t movepair[2];
uint16_t moveid;
uint8_t orphans;
} g;
} lfs_global_t;
typedef struct lfs_mdir {