mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 16:14:16 +01:00
Introduced the LFS_O_SNAPSHOT flag
LFS_O_SNAPSHOT brings back some of littlefs's idiosyncratic behavior removed in the changes to open file syncing in a form that may be more useful for users. LFS_O_SNAPSHOT allows you to open a "snapshot" of a file. This is a cheap, local copy of a file who's changes are not reflected on disk. Internally, snapshot files use the same mechanism as pending writes. A separate, copy-on-write CTZ skip-list is created, with read-only references to the existing data blocks until a write occurs. The difference is that snapshot files are not enrolled in the mlist, meaning they won't get updates from open file syncs, and during close their contents are simply discarded. As an extra benefit, LFS_O_CREAT | LFS_O_SNAPSHOT is equivalent to Linux's O_TMPFILE, making it easy to create temporary, unnamed files. This may be useful for embedded development, where unnamed flash-backed buffers may provide a slower, but larger, alternative to RAM-backed buffers.
This commit is contained in:
Christopher Haster
@@ -504,3 +504,433 @@ code = '''
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}
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lfs_unmount(&lfs) => 0;
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'''
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[[case]] # simple snapshot for reading
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define.SIZE = [10, 100, 1000, 10000]
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code = '''
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const char alphas[] = "abcdefghijklmnopqrstuvwxyz";
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const char nums[] = "0123456789";
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lfs_format(&lfs, &cfg) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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const struct lfs_file_config filecfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', "abcd", 4},
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},
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};
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lfs_file_opencfg(&lfs, &file, "open_me",
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LFS_O_CREAT | LFS_O_WRONLY, &filecfg) => 0;
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for (int j = 0; j < SIZE; j++) {
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lfs_file_write(&lfs, &file, &alphas[j % 26], 1) => 1;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// open reader/writer/snapshot
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_t reader;
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const struct lfs_file_config readercfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', &(uint8_t[4]){0}, 4}
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},
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};
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lfs_file_t writer;
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const struct lfs_file_config writercfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', &(uint8_t[4]){0}, 4}
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},
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};
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lfs_file_t snapshot;
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const struct lfs_file_config snapshotcfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', &(uint8_t[4]){0}, 4}
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},
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};
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lfs_file_opencfg(&lfs, &reader, "open_me",
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LFS_O_RDONLY, &readercfg) => 0;
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lfs_file_opencfg(&lfs, &writer, "open_me",
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LFS_O_WRONLY, &writercfg) => 0;
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lfs_file_opencfg(&lfs, &snapshot, "open_me",
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LFS_O_RDONLY | LFS_O_SNAPSHOT, &snapshotcfg) => 0;
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assert(memcmp(readercfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = 0; j < SIZE/2; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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assert(memcmp(snapshotcfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = 0; j < SIZE/2; j++) {
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lfs_file_read(&lfs, &snapshot, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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// write file
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for (int j = 0; j < SIZE; j++) {
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lfs_file_write(&lfs, &writer, &nums[j % 10], 1) => 1;
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}
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memcpy(writercfg.attrs[0].buffer, "0123", 4);
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lfs_file_sync(&lfs, &writer) => 0;
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// reader should change
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assert(memcmp(readercfg.attrs[0].buffer, "0123", 4) == 0);
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for (int j = SIZE/2; j < SIZE; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == nums[j % 10]);
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}
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// snapshot should remain unchanged
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assert(memcmp(snapshotcfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = SIZE/2; j < SIZE; j++) {
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lfs_file_read(&lfs, &snapshot, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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lfs_file_close(&lfs, &reader) => 0;
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lfs_file_close(&lfs, &writer) => 0;
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lfs_file_close(&lfs, &snapshot) => 0;
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// disk should change
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lfs_file_opencfg(&lfs, &reader, "open_me",
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LFS_O_RDONLY, &readercfg) => 0;
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assert(memcmp(readercfg.attrs[0].buffer, "0123", 4) == 0);
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == nums[j % 10]);
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}
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lfs_file_close(&lfs, &reader) => 0;
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lfs_unmount(&lfs) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_opencfg(&lfs, &reader, "open_me",
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LFS_O_RDONLY, &readercfg) => 0;
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assert(memcmp(readercfg.attrs[0].buffer, "0123", 4) == 0);
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == nums[j % 10]);
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}
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lfs_file_close(&lfs, &reader) => 0;
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lfs_unmount(&lfs) => 0;
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'''
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[[case]] # simple snapshot for writing
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define.SIZE = [10, 100, 1000, 10000]
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code = '''
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const char alphas[] = "abcdefghijklmnopqrstuvwxyz";
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const char nums[] = "0123456789";
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lfs_format(&lfs, &cfg) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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const struct lfs_file_config filecfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', "abcd", 4},
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},
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};
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lfs_file_opencfg(&lfs, &file, "open_me",
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LFS_O_CREAT | LFS_O_WRONLY, &filecfg) => 0;
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for (int j = 0; j < SIZE; j++) {
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lfs_file_write(&lfs, &file, &alphas[j % 26], 1) => 1;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// open reader/snapshot
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_t reader;
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const struct lfs_file_config readercfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', &(uint8_t[4]){0}, 4}
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},
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};
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lfs_file_t snapshot;
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const struct lfs_file_config snapshotcfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', &(uint8_t[4]){0}, 4}
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},
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};
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lfs_file_opencfg(&lfs, &reader, "open_me",
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LFS_O_RDONLY, &readercfg) => 0;
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lfs_file_opencfg(&lfs, &snapshot, "open_me",
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LFS_O_RDWR | LFS_O_SNAPSHOT, &snapshotcfg) => 0;
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assert(memcmp(readercfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = 0; j < SIZE/2; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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assert(memcmp(snapshotcfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &snapshot, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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// modify snapshot
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lfs_file_rewind(&lfs, &snapshot) => 0;
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for (int j = 0; j < SIZE; j++) {
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lfs_file_write(&lfs, &snapshot, &nums[j % 10], 1) => 1;
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}
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memcpy(snapshotcfg.attrs[0].buffer, "0123", 4);
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lfs_file_rewind(&lfs, &snapshot) => 0;
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &snapshot, buffer, 1) => 1;
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assert(buffer[0] == nums[j % 10]);
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}
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lfs_file_sync(&lfs, &snapshot) => 0;
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// reader should not change
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assert(memcmp(readercfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = SIZE/2; j < SIZE; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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// snapshot should changed
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assert(memcmp(snapshotcfg.attrs[0].buffer, "0123", 4) == 0);
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lfs_file_rewind(&lfs, &snapshot) => 0;
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &snapshot, buffer, 1) => 1;
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assert(buffer[0] == nums[j % 10]);
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}
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lfs_file_close(&lfs, &reader) => 0;
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lfs_file_close(&lfs, &snapshot) => 0;
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// disk should not change
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lfs_file_opencfg(&lfs, &reader, "open_me",
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LFS_O_RDONLY, &readercfg) => 0;
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assert(memcmp(readercfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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lfs_file_close(&lfs, &reader) => 0;
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lfs_unmount(&lfs) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_opencfg(&lfs, &reader, "open_me",
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LFS_O_RDONLY, &readercfg) => 0;
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assert(memcmp(readercfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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lfs_file_close(&lfs, &reader) => 0;
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lfs_unmount(&lfs) => 0;
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'''
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[[case]] # temporary files
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define.SIZE = [10, 100, 1000, 10000]
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define.TMP_PATH = 'range(4)'
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code = '''
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const char alphas[] = "abcdefghijklmnopqrstuvwxyz";
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const char nums[] = "0123456789";
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const char caps[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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lfs_format(&lfs, &cfg) => 0;
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lfs_mount(&lfs, &cfg) => 0;
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const struct lfs_file_config filecfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', "abcd", 4},
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},
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};
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lfs_file_opencfg(&lfs, &file, "open_me",
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LFS_O_CREAT | LFS_O_WRONLY, &filecfg) => 0;
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for (int j = 0; j < SIZE; j++) {
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lfs_file_write(&lfs, &file, &alphas[j % 26], 1) => 1;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_file_opencfg(&lfs, &file, "dont_open_me",
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LFS_O_CREAT | LFS_O_WRONLY, &filecfg) => 0;
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for (int j = 0; j < SIZE; j++) {
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lfs_file_write(&lfs, &file, &alphas[j % 26], 1) => 1;
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}
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lfs_file_close(&lfs, &file) => 0;
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lfs_unmount(&lfs) => 0;
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// open reader/writer/temp
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lfs_mount(&lfs, &cfg) => 0;
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lfs_file_t reader;
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const struct lfs_file_config readercfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', &(uint8_t[4]){0}, 4}
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},
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};
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lfs_file_t writer;
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const struct lfs_file_config writercfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', &(uint8_t[4]){0}, 4}
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},
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};
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lfs_file_t tmp;
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const struct lfs_file_config tmpcfg = {
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.attr_count = 1,
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.attrs = (struct lfs_attr[]){
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{'A', &(uint8_t[4]){0}, 4}
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},
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};
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lfs_file_opencfg(&lfs, &reader, "open_me",
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LFS_O_RDONLY, &readercfg) => 0;
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lfs_file_opencfg(&lfs, &writer, "open_me",
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LFS_O_WRONLY, &writercfg) => 0;
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const char *tmp_paths[] = {NULL, "/", "/tmp", "/open_me.tmp"};
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lfs_file_opencfg(&lfs, &tmp, tmp_paths[TMP_PATH],
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LFS_O_RDWR | LFS_O_CREAT | LFS_O_SNAPSHOT, &tmpcfg) => 0;
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assert(memcmp(readercfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = 0; j < SIZE/3; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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assert(memcmp(tmpcfg.attrs[0].buffer, "\0\0\0\0", 4) == 0);
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assert(lfs_file_size(&lfs, &tmp) == 0);
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// write to tmp
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for (int j = 0; j < SIZE; j++) {
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lfs_file_write(&lfs, &tmp, &nums[j % 10], 1) => 1;
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}
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memcpy(tmpcfg.attrs[0].buffer, "0123", 4);
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lfs_file_rewind(&lfs, &tmp) => 0;
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &tmp, buffer, 1) => 1;
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assert(buffer[0] == nums[j % 10]);
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}
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lfs_file_sync(&lfs, &tmp) => 0;
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// reader should not change
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assert(memcmp(readercfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = SIZE/3; j < 2*SIZE/3; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
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// tmp should change
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assert(memcmp(tmpcfg.attrs[0].buffer, "0123", 4) == 0);
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lfs_file_rewind(&lfs, &tmp) => 0;
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for (int j = 0; j < SIZE/2; j++) {
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lfs_file_read(&lfs, &tmp, buffer, 1) => 1;
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assert(buffer[0] == nums[j % 10]);
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}
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// write to file
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for (int j = 0; j < SIZE; j++) {
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lfs_file_write(&lfs, &writer, &caps[j % 26], 1) => 1;
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}
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memcpy(writercfg.attrs[0].buffer, "ABCD", 4);
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lfs_file_sync(&lfs, &writer) => 0;
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// reader should change
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assert(memcmp(readercfg.attrs[0].buffer, "ABCD", 4) == 0);
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for (int j = 2*SIZE/3; j < SIZE; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == caps[j % 26]);
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}
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// tmp should not change
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assert(memcmp(tmpcfg.attrs[0].buffer, "0123", 4) == 0);
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for (int j = SIZE/2; j < SIZE; j++) {
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lfs_file_read(&lfs, &tmp, buffer, 1) => 1;
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assert(buffer[0] == nums[j % 10]);
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}
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lfs_file_close(&lfs, &reader) => 0;
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lfs_file_close(&lfs, &writer) => 0;
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lfs_file_close(&lfs, &tmp) => 0;
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// tmp should not appear on disk
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lfs_dir_open(&lfs, &dir, "/") => 0;
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lfs_dir_read(&lfs, &dir, &info) => 1;
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assert(info.type == LFS_TYPE_DIR);
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assert(strcmp(info.name, ".") == 0);
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lfs_dir_read(&lfs, &dir, &info) => 1;
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assert(info.type == LFS_TYPE_DIR);
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assert(strcmp(info.name, "..") == 0);
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lfs_dir_read(&lfs, &dir, &info) => 1;
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assert(info.type == LFS_TYPE_REG);
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assert(strcmp(info.name, "dont_open_me") == 0);
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lfs_dir_read(&lfs, &dir, &info) => 1;
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assert(info.type == LFS_TYPE_REG);
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assert(strcmp(info.name, "open_me") == 0);
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lfs_dir_read(&lfs, &dir, &info) => 0;
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lfs_dir_close(&lfs, &dir) => 0;
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lfs_file_opencfg(&lfs, &reader, "open_me",
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LFS_O_RDONLY, &readercfg) => 0;
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assert(memcmp(readercfg.attrs[0].buffer, "ABCD", 4) == 0);
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == caps[j % 26]);
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}
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lfs_file_close(&lfs, &reader) => 0;
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lfs_file_opencfg(&lfs, &reader, "dont_open_me",
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LFS_O_RDONLY, &readercfg) => 0;
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assert(memcmp(readercfg.attrs[0].buffer, "abcd", 4) == 0);
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for (int j = 0; j < SIZE; j++) {
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lfs_file_read(&lfs, &reader, buffer, 1) => 1;
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assert(buffer[0] == alphas[j % 26]);
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}
|
||||
lfs_file_close(&lfs, &reader) => 0;
|
||||
lfs_unmount(&lfs) => 0;
|
||||
|
||||
lfs_mount(&lfs, &cfg) => 0;
|
||||
lfs_dir_open(&lfs, &dir, "/") => 0;
|
||||
lfs_dir_read(&lfs, &dir, &info) => 1;
|
||||
assert(info.type == LFS_TYPE_DIR);
|
||||
assert(strcmp(info.name, ".") == 0);
|
||||
lfs_dir_read(&lfs, &dir, &info) => 1;
|
||||
assert(info.type == LFS_TYPE_DIR);
|
||||
assert(strcmp(info.name, "..") == 0);
|
||||
lfs_dir_read(&lfs, &dir, &info) => 1;
|
||||
assert(info.type == LFS_TYPE_REG);
|
||||
assert(strcmp(info.name, "dont_open_me") == 0);
|
||||
lfs_dir_read(&lfs, &dir, &info) => 1;
|
||||
assert(info.type == LFS_TYPE_REG);
|
||||
assert(strcmp(info.name, "open_me") == 0);
|
||||
lfs_dir_read(&lfs, &dir, &info) => 0;
|
||||
lfs_dir_close(&lfs, &dir) => 0;
|
||||
lfs_file_opencfg(&lfs, &reader, "open_me",
|
||||
LFS_O_RDONLY, &readercfg) => 0;
|
||||
assert(memcmp(readercfg.attrs[0].buffer, "ABCD", 4) == 0);
|
||||
for (int j = 0; j < SIZE; j++) {
|
||||
lfs_file_read(&lfs, &reader, buffer, 1) => 1;
|
||||
assert(buffer[0] == caps[j % 26]);
|
||||
}
|
||||
lfs_file_close(&lfs, &reader) => 0;
|
||||
lfs_file_opencfg(&lfs, &reader, "dont_open_me",
|
||||
LFS_O_RDONLY, &readercfg) => 0;
|
||||
assert(memcmp(readercfg.attrs[0].buffer, "abcd", 4) == 0);
|
||||
for (int j = 0; j < SIZE; j++) {
|
||||
lfs_file_read(&lfs, &reader, buffer, 1) => 1;
|
||||
assert(buffer[0] == alphas[j % 26]);
|
||||
}
|
||||
lfs_file_close(&lfs, &reader) => 0;
|
||||
lfs_unmount(&lfs) => 0;
|
||||
'''
|
||||
|
||||
[[case]] # test snapshot open errors
|
||||
code = '''
|
||||
lfs_format(&lfs, &cfg) => 0;
|
||||
lfs_mount(&lfs, &cfg) => 0;
|
||||
lfs_file_open(&lfs, &file, NULL,
|
||||
LFS_O_RDWR | LFS_O_SNAPSHOT) => LFS_ERR_ISDIR;
|
||||
lfs_file_open(&lfs, &file, "/",
|
||||
LFS_O_RDWR | LFS_O_SNAPSHOT) => LFS_ERR_ISDIR;
|
||||
lfs_file_open(&lfs, &file, "/tmp",
|
||||
LFS_O_RDWR | LFS_O_SNAPSHOT) => LFS_ERR_NOENT;
|
||||
lfs_file_open(&lfs, &file, "/tmp/",
|
||||
LFS_O_RDWR | LFS_O_CREAT | LFS_O_SNAPSHOT) => LFS_ERR_NOENT;
|
||||
lfs_file_open(&lfs, &file, "/tmp/tmp",
|
||||
LFS_O_RDWR | LFS_O_CREAT | LFS_O_SNAPSHOT) => LFS_ERR_NOENT;
|
||||
lfs_unmount(&lfs) => 0;
|
||||
'''
|
||||
|
||||
Reference in New Issue
Block a user