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WIP added hacky taped on inline files

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This commit is contained in:
Christopher Haster
2018-03-17 10:28:14 -05:00
parent a418c2068d
commit 345f7f3235
2 changed files with 124 additions and 59 deletions
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155
lfs.c
View File

@@ -24,7 +24,7 @@ static int lfs_cache_read(lfs_t *lfs, lfs_cache_t *rcache,
const lfs_cache_t *pcache, lfs_block_t block,
lfs_off_t off, void *buffer, lfs_size_t size) {
uint8_t *data = buffer;
LFS_ASSERT(block < lfs->cfg->block_count);
//LFS_ASSERT(block < lfs->cfg->block_count); TODO reintroduce :/
while (size > 0) {
if (pcache && block == pcache->block && off >= pcache->off &&
@@ -149,7 +149,7 @@ static int lfs_cache_prog(lfs_t *lfs, lfs_cache_t *pcache,
lfs_cache_t *rcache, lfs_block_t block,
lfs_off_t off, const void *buffer, lfs_size_t size) {
const uint8_t *data = buffer;
LFS_ASSERT(block < lfs->cfg->block_count);
//LFS_ASSERT(block < lfs->cfg->block_count); TODO reintroduce :/
while (size > 0) {
if (block == pcache->block && off >= pcache->off &&
@@ -851,7 +851,7 @@ static int lfs_dir_update(lfs_t *lfs, lfs_dir_t *dir,
}
static int lfs_dir_next(lfs_t *lfs, lfs_dir_t *dir, lfs_entry_t *entry) {
while (dir->off + sizeof(entry->d) > (0x7fffffff & dir->d.size)-4) {
while (dir->off >= (0x7fffffff & dir->d.size)-4) {
if (!(0x80000000 & dir->d.size)) {
entry->off = dir->off;
return LFS_ERR_NOENT;
@@ -942,8 +942,8 @@ static int lfs_dir_find(lfs_t *lfs, lfs_dir_t *dir,
return err;
}
if (((0x7f & entry->d.type) != (LFS_STRUCT_CTZ | LFS_TYPE_REG) &&
(0x7f & entry->d.type) != (LFS_STRUCT_DIR | LFS_TYPE_DIR)) ||
if (((0xf & entry->d.type) != LFS_TYPE_REG &&
(0xf & entry->d.type) != LFS_TYPE_DIR) ||
entry->d.nlen != pathlen) {
continue;
}
@@ -1126,8 +1126,8 @@ int lfs_dir_read(lfs_t *lfs, lfs_dir_t *dir, struct lfs_info *info) {
return (err == LFS_ERR_NOENT) ? 0 : err;
}
if ((0x7f & entry.d.type) != (LFS_STRUCT_CTZ | LFS_TYPE_REG) &&
(0x7f & entry.d.type) != (LFS_STRUCT_DIR | LFS_TYPE_DIR)) {
if ((0xf & entry.d.type) != LFS_TYPE_REG &&
(0xf & entry.d.type) != LFS_TYPE_DIR) {
continue;
}
@@ -1149,8 +1149,10 @@ int lfs_dir_read(lfs_t *lfs, lfs_dir_t *dir, struct lfs_info *info) {
}
info->type = 0xf & entry.d.type;
if (info->type == LFS_TYPE_REG) {
if (entry.d.type == (LFS_STRUCT_CTZ | LFS_TYPE_REG)) {
info->size = entry.d.u.file.size;
} else if (entry.d.type == (LFS_STRUCT_INLINE | LFS_TYPE_REG)) {
info->size = entry.d.elen;
}
int err = lfs_bd_read(lfs, dir->pair[0],
@@ -1424,18 +1426,16 @@ int lfs_file_open(lfs_t *lfs, lfs_file_t *file,
}
// create entry to remember name
entry.d.type = LFS_STRUCT_CTZ | LFS_TYPE_REG;
entry.d.elen = sizeof(entry.d) - 4;
entry.d.type = LFS_STRUCT_INLINE | LFS_TYPE_REG;
entry.d.elen = 0;
entry.d.alen = 0;
entry.d.nlen = strlen(path);
entry.d.u.file.head = 0xffffffff;
entry.d.u.file.size = 0;
entry.size = 4 + entry.d.elen + entry.d.alen + entry.d.nlen;
err = lfs_dir_append(lfs, &cwd, &entry,
&(struct lfs_region){
0, +sizeof(entry.d),
lfs_commit_mem, &entry.d, sizeof(entry.d),
0, +4,
lfs_commit_mem, &entry.d, 4,
&(struct lfs_region){
0, +entry.d.nlen,
lfs_commit_mem, path, entry.d.nlen}});
@@ -1481,6 +1481,20 @@ int lfs_file_open(lfs_t *lfs, lfs_file_t *file,
}
}
// load inline files
if ((0x70 & entry.d.type) == LFS_STRUCT_INLINE) {
file->head = 0xffffffff;
file->size = entry.d.elen;
file->flags |= LFS_F_INLINE;
err = lfs_bd_read(lfs, cwd.pair[0],
entry.off + 4,
file->cache.buffer, file->size);
if (err) {
lfs_free(file->cache.buffer);
return err;
}
}
// add to list of files
file->next = lfs->files;
lfs->files = file;
@@ -1556,6 +1570,20 @@ relocate:
}
static int lfs_file_flush(lfs_t *lfs, lfs_file_t *file) {
if (file->flags & LFS_F_INLINE) {
// do nothing since we won't need the cache for anything else
if (file->flags & LFS_F_READING) {
file->flags &= ~LFS_F_READING;
}
if (file->flags & LFS_F_WRITING) {
file->flags &= ~LFS_F_WRITING;
file->flags |= LFS_F_DIRTY;
}
return 0;
}
if (file->flags & LFS_F_READING) {
// just drop read cache
file->cache.block = 0xffffffff;
@@ -1649,19 +1677,34 @@ int lfs_file_sync(lfs_t *lfs, lfs_file_t *file) {
if (err) {
return err;
}
LFS_ASSERT((0xf & entry.d.type) == LFS_TYPE_REG);
LFS_ASSERT(entry.d.type == (LFS_STRUCT_CTZ | LFS_TYPE_REG));
entry.d.u.file.head = file->head;
entry.d.u.file.size = file->size;
if (file->flags & LFS_F_INLINE) {
file->size = lfs_max(file->pos, file->size);
lfs_ssize_t diff = file->size - entry.d.elen;
entry.d.elen = file->size;
lfs_entry_tole32(&entry.d);
err = lfs_dir_update(lfs, &cwd, &entry,
&(struct lfs_region){
0, 0,
lfs_commit_mem, &entry.d, sizeof(entry.d)});
lfs_entry_fromle32(&entry.d);
if (err) {
return err;
err = lfs_dir_update(lfs, &cwd, &entry,
&(struct lfs_region){
0, 0,
lfs_commit_mem, &entry.d, 4,
&(struct lfs_region){
4, diff,
lfs_commit_mem, file->cache.buffer, file->size}});
if (err) {
return err;
}
} else {
entry.d.u.file.head = file->head;
entry.d.u.file.size = file->size;
err = lfs_dir_update(lfs, &cwd, &entry,
&(struct lfs_region){
0, 0,
lfs_commit_mem, &entry.d, sizeof(entry.d)});
if (err) {
return err;
}
}
file->flags &= ~LFS_F_DIRTY;
@@ -1699,11 +1742,16 @@ lfs_ssize_t lfs_file_read(lfs_t *lfs, lfs_file_t *file,
// check if we need a new block
if (!(file->flags & LFS_F_READING) ||
file->off == lfs->cfg->block_size) {
int err = lfs_ctz_find(lfs, &file->cache, NULL,
file->head, file->size,
file->pos, &file->block, &file->off);
if (err) {
return err;
if (!(file->flags & LFS_F_INLINE)) {
int err = lfs_ctz_find(lfs, &file->cache, NULL,
file->head, file->size,
file->pos, &file->block, &file->off);
if (err) {
return err;
}
} else {
file->block = 0xffffffff;
file->off = 0;
}
file->flags |= LFS_F_READING;
@@ -1761,31 +1809,42 @@ lfs_ssize_t lfs_file_write(lfs_t *lfs, lfs_file_t *file,
}
while (nsize > 0) {
//printf("pos %d\n", file->pos + nsize);
// TODO combine with block allocation?
if (file->pos + nsize >= LFS_INLINE_MAX) {
file->flags &= ~LFS_F_INLINE;
}
// check if we need a new block
if (!(file->flags & LFS_F_WRITING) ||
file->off == lfs->cfg->block_size) {
if (!(file->flags & LFS_F_WRITING) && file->pos > 0) {
// find out which block we're extending from
int err = lfs_ctz_find(lfs, &file->cache, NULL,
file->head, file->size,
file->pos-1, &file->block, &file->off);
if (!(file->flags & LFS_F_INLINE)) {
if (!(file->flags & LFS_F_WRITING) && file->pos > 0) {
// find out which block we're extending from
int err = lfs_ctz_find(lfs, &file->cache, NULL,
file->head, file->size,
file->pos-1, &file->block, &file->off);
if (err) {
file->flags |= LFS_F_ERRED;
return err;
}
// mark cache as dirty since we may have read data into it
file->cache.block = 0xffffffff;
}
// extend file with new blocks
lfs_alloc_ack(lfs);
int err = lfs_ctz_extend(lfs, &lfs->rcache, &file->cache,
file->block, file->pos,
&file->block, &file->off);
if (err) {
file->flags |= LFS_F_ERRED;
return err;
}
// mark cache as dirty since we may have read data into it
file->cache.block = 0xffffffff;
}
// extend file with new blocks
lfs_alloc_ack(lfs);
int err = lfs_ctz_extend(lfs, &lfs->rcache, &file->cache,
file->block, file->pos,
&file->block, &file->off);
if (err) {
file->flags |= LFS_F_ERRED;
return err;
} else {
file->block = 0xffffffff;
file->off = 0;
}
file->flags |= LFS_F_WRITING;

28
lfs.h
View File

@@ -55,6 +55,10 @@ typedef uint32_t lfs_block_t;
#define LFS_NAME_MAX 255
#endif
#ifndef LFS_INLINE_MAX
#define LFS_INLINE_MAX 255
#endif
// Possible error codes, these are negative to allow
// valid positive return values
enum lfs_error {
@@ -82,25 +86,27 @@ enum lfs_type {
// on disk structure
LFS_STRUCT_CTZ = 0x10,
LFS_STRUCT_DIR = 0x20,
LFS_STRUCT_INLINE = 0x30,
LFS_STRUCT_MOVED = 0x80,
};
// File open flags
enum lfs_open_flags {
// open flags
LFS_O_RDONLY = 1, // Open a file as read only
LFS_O_WRONLY = 2, // Open a file as write only
LFS_O_RDWR = 3, // Open a file as read and write
LFS_O_CREAT = 0x0100, // Create a file if it does not exist
LFS_O_EXCL = 0x0200, // Fail if a file already exists
LFS_O_TRUNC = 0x0400, // Truncate the existing file to zero size
LFS_O_APPEND = 0x0800, // Move to end of file on every write
LFS_O_RDONLY = 1, // Open a file as read only
LFS_O_WRONLY = 2, // Open a file as write only
LFS_O_RDWR = 3, // Open a file as read and write
LFS_O_CREAT = 0x0100, // Create a file if it does not exist
LFS_O_EXCL = 0x0200, // Fail if a file already exists
LFS_O_TRUNC = 0x0400, // Truncate the existing file to zero size
LFS_O_APPEND = 0x0800, // Move to end of file on every write
// internally used flags
LFS_F_DIRTY = 0x10000, // File does not match storage
LFS_F_WRITING = 0x20000, // File has been written since last flush
LFS_F_READING = 0x40000, // File has been read since last flush
LFS_F_ERRED = 0x80000, // An error occured during write
LFS_F_DIRTY = 0x10000, // File does not match storage
LFS_F_WRITING = 0x20000, // File has been written since last flush
LFS_F_READING = 0x40000, // File has been read since last flush
LFS_F_ERRED = 0x80000, // An error occured during write
LFS_F_INLINE = 0x100000, // Currently inlined in directory entry
};
// File seek flags