Make the I/O semantics functionality in Coffee unconditional so that the API becomes consistent across platforms.
Change certain CPP conditionals into C conditionals, which should be possible for the compiler to optimize at runtime. This makes the source code easier to read.
This commit is contained in:
Nicolas Tsiftes
parent
30e820ffa5
commit
5010309005
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@ -75,12 +75,6 @@
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#error "Cannot have COFFEE_APPEND_ONLY set when COFFEE_MICRO_LOGS is set."
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#endif
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/* I/O semantics can be set on file descriptors in order to optimize
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file access on certain storage types. */
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#ifndef COFFEE_IO_SEMANTICS
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#define COFFEE_IO_SEMANTICS 0
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#endif
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/*
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* Prevent sectors from being erased directly after file removal.
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* This will level the wear across sectors better, but may lead
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@ -94,16 +88,21 @@
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#error COFFEE_START must point to the first byte in a sector.
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#endif
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/* File descriptor flags. */
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#define COFFEE_FD_FREE 0x0
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#define COFFEE_FD_READ 0x1
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#define COFFEE_FD_WRITE 0x2
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#define COFFEE_FD_APPEND 0x4
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/* File object flags. */
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#define COFFEE_FILE_MODIFIED 0x1
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/* Internal Coffee markers. */
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#define INVALID_PAGE ((coffee_page_t)-1)
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#define UNKNOWN_OFFSET ((cfs_offset_t)-1)
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/* File removal actions. They can have the same values because
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they are passed as separate parameters. */
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#define REMOVE_LOG 1
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#define CLOSE_FDS 1
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#define ALLOW_GC 1
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@ -176,9 +175,7 @@ struct file_desc {
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cfs_offset_t offset;
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struct file *file;
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uint8_t flags;
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#if COFFEE_IO_SEMANTICS
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uint8_t io_flags;
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#endif
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};
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/* The file header structure mimics the representation of file headers
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@ -221,11 +218,9 @@ static void
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read_header(struct file_header *hdr, coffee_page_t page)
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{
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COFFEE_READ(hdr, sizeof(*hdr), page * COFFEE_PAGE_SIZE);
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#if DEBUG
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if(HDR_ACTIVE(*hdr) && !HDR_VALID(*hdr)) {
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PRINTF("Invalid header at page %u!\n", (unsigned)page);
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if(DEBUG && HDR_ACTIVE(*hdr) && !HDR_VALID(*hdr)) {
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PRINTF("Coffee: Invalid header at page %u!\n", (unsigned)page);
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}
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#endif
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}
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/*---------------------------------------------------------------------------*/
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static cfs_offset_t
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@ -561,8 +556,8 @@ find_contiguous_pages(coffee_page_t amount)
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}
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/*---------------------------------------------------------------------------*/
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static int
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remove_by_page(coffee_page_t page, int remove_log, int close_fds,
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int gc_allowed)
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remove_by_page(coffee_page_t page, int remove_log,
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int close_fds, int gc_allowed)
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{
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struct file_header hdr;
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int i;
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@ -600,11 +595,9 @@ remove_by_page(coffee_page_t page, int remove_log, int close_fds,
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}
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}
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#if !COFFEE_EXTENDED_WEAR_LEVELLING
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if(gc_allowed) {
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if(!COFFEE_EXTENDED_WEAR_LEVELLING && gc_allowed) {
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collect_garbage(GC_RELUCTANT);
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}
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#endif
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return 0;
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}
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@ -1104,19 +1097,13 @@ cfs_read(int fd, void *buf, unsigned size)
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fdp = &coffee_fd_set[fd];
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file = fdp->file;
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#if COFFEE_IO_SEMANTICS
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if(fdp->io_flags & CFS_COFFEE_IO_ENSURE_READ_LENGTH) {
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while(fdp->offset + size > file->end) {
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((char*)buf)[--size] = 0;
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((char *)buf)[--size] = '\0';
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}
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} else {
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#endif
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if(fdp->offset + size > file->end) {
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} else if(fdp->offset + size > file->end) {
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size = file->end - fdp->offset;
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}
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#if COFFEE_IO_SEMANTICS
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}
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#endif
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/* If the file is not modified, read directly from the file extent. */
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if(!FILE_MODIFIED(file)) {
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@ -1173,9 +1160,7 @@ cfs_write(int fd, const void *buf, unsigned size)
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file = fdp->file;
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/* Attempt to extend the file if we try to write past the end. */
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#if COFFEE_IO_SEMANTICS
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if(!(fdp->io_flags & CFS_COFFEE_IO_FIRM_SIZE)) {
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#endif
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while(size + fdp->offset + sizeof(struct file_header) >
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(file->max_pages * COFFEE_PAGE_SIZE)) {
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if(merge_log(file->page, 1) < 0) {
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@ -1184,17 +1169,11 @@ cfs_write(int fd, const void *buf, unsigned size)
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file = fdp->file;
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PRINTF("Extended the file at page %u\n", (unsigned)file->page);
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}
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#if COFFEE_IO_SEMANTICS
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}
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#endif
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}
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#if COFFEE_MICRO_LOGS
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#if COFFEE_IO_SEMANTICS
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if(!(fdp->io_flags & CFS_COFFEE_IO_FLASH_AWARE) &&
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(FILE_MODIFIED(file) || fdp->offset < file->end)) {
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#else
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if(FILE_MODIFIED(file) || fdp->offset < file->end) {
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#endif
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need_dummy_write = 0;
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for(bytes_left = size; bytes_left > 0;) {
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lp.offset = fdp->offset;
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@ -1236,16 +1215,14 @@ cfs_write(int fd, const void *buf, unsigned size)
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}
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} else {
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#endif /* COFFEE_MICRO_LOGS */
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#if COFFEE_APPEND_ONLY
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if(fdp->offset < file->end) {
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if(COFFEE_APPEND_ONLY && fdp->offset < file->end) {
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return -1;
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}
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#endif /* COFFEE_APPEND_ONLY */
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COFFEE_WRITE(buf, size, absolute_offset(file->page, fdp->offset));
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fdp->offset += size;
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#if COFFEE_MICRO_LOGS
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}
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}
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#endif /* COFFEE_MICRO_LOGS */
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if(fdp->offset > file->end) {
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@ -55,7 +55,6 @@
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#define COFFEE_LOG_SIZE 8192
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#define COFFEE_LOG_TABLE_LIMIT 256
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#define COFFEE_MICRO_LOGS 0
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#define COFFEE_IO_SEMANTICS 1
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#define COFFEE_WRITE(buf, size, offset) \
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xmem_pwrite((char *)(buf), (size), COFFEE_START + (offset))
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@ -59,7 +59,6 @@
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#endif
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#define COFFEE_LOG_SIZE 1024
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#define COFFEE_IO_SEMANTICS 1
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#define COFFEE_APPEND_ONLY 0
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#define COFFEE_MICRO_LOGS 1
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