diff options
Diffstat (limited to 'block/cmdline-parser.c')
| -rw-r--r-- | block/cmdline-parser.c | 255 |
1 files changed, 0 insertions, 255 deletions
diff --git a/block/cmdline-parser.c b/block/cmdline-parser.c deleted file mode 100644 index f2a14571882b..000000000000 --- a/block/cmdline-parser.c +++ /dev/null @@ -1,255 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Parse command line, get partition information - * - * Written by Cai Zhiyong <caizhiyong@huawei.com> - * - */ -#include <linux/export.h> -#include <linux/cmdline-parser.h> - -static int parse_subpart(struct cmdline_subpart **subpart, char *partdef) -{ - int ret = 0; - struct cmdline_subpart *new_subpart; - - *subpart = NULL; - - new_subpart = kzalloc(sizeof(struct cmdline_subpart), GFP_KERNEL); - if (!new_subpart) - return -ENOMEM; - - if (*partdef == '-') { - new_subpart->size = (sector_t)(~0ULL); - partdef++; - } else { - new_subpart->size = (sector_t)memparse(partdef, &partdef); - if (new_subpart->size < (sector_t)PAGE_SIZE) { - pr_warn("cmdline partition size is invalid."); - ret = -EINVAL; - goto fail; - } - } - - if (*partdef == '@') { - partdef++; - new_subpart->from = (sector_t)memparse(partdef, &partdef); - } else { - new_subpart->from = (sector_t)(~0ULL); - } - - if (*partdef == '(') { - int length; - char *next = strchr(++partdef, ')'); - - if (!next) { - pr_warn("cmdline partition format is invalid."); - ret = -EINVAL; - goto fail; - } - - length = min_t(int, next - partdef, - sizeof(new_subpart->name) - 1); - strncpy(new_subpart->name, partdef, length); - new_subpart->name[length] = '\0'; - - partdef = ++next; - } else - new_subpart->name[0] = '\0'; - - new_subpart->flags = 0; - - if (!strncmp(partdef, "ro", 2)) { - new_subpart->flags |= PF_RDONLY; - partdef += 2; - } - - if (!strncmp(partdef, "lk", 2)) { - new_subpart->flags |= PF_POWERUP_LOCK; - partdef += 2; - } - - *subpart = new_subpart; - return 0; -fail: - kfree(new_subpart); - return ret; -} - -static void free_subpart(struct cmdline_parts *parts) -{ - struct cmdline_subpart *subpart; - - while (parts->subpart) { - subpart = parts->subpart; - parts->subpart = subpart->next_subpart; - kfree(subpart); - } -} - -static int parse_parts(struct cmdline_parts **parts, const char *bdevdef) -{ - int ret = -EINVAL; - char *next; - int length; - struct cmdline_subpart **next_subpart; - struct cmdline_parts *newparts; - char buf[BDEVNAME_SIZE + 32 + 4]; - - *parts = NULL; - - newparts = kzalloc(sizeof(struct cmdline_parts), GFP_KERNEL); - if (!newparts) - return -ENOMEM; - - next = strchr(bdevdef, ':'); - if (!next) { - pr_warn("cmdline partition has no block device."); - goto fail; - } - - length = min_t(int, next - bdevdef, sizeof(newparts->name) - 1); - strncpy(newparts->name, bdevdef, length); - newparts->name[length] = '\0'; - newparts->nr_subparts = 0; - - next_subpart = &newparts->subpart; - - while (next && *(++next)) { - bdevdef = next; - next = strchr(bdevdef, ','); - - length = (!next) ? (sizeof(buf) - 1) : - min_t(int, next - bdevdef, sizeof(buf) - 1); - - strncpy(buf, bdevdef, length); - buf[length] = '\0'; - - ret = parse_subpart(next_subpart, buf); - if (ret) - goto fail; - - newparts->nr_subparts++; - next_subpart = &(*next_subpart)->next_subpart; - } - - if (!newparts->subpart) { - pr_warn("cmdline partition has no valid partition."); - ret = -EINVAL; - goto fail; - } - - *parts = newparts; - - return 0; -fail: - free_subpart(newparts); - kfree(newparts); - return ret; -} - -void cmdline_parts_free(struct cmdline_parts **parts) -{ - struct cmdline_parts *next_parts; - - while (*parts) { - next_parts = (*parts)->next_parts; - free_subpart(*parts); - kfree(*parts); - *parts = next_parts; - } -} -EXPORT_SYMBOL(cmdline_parts_free); - -int cmdline_parts_parse(struct cmdline_parts **parts, const char *cmdline) -{ - int ret; - char *buf; - char *pbuf; - char *next; - struct cmdline_parts **next_parts; - - *parts = NULL; - - next = pbuf = buf = kstrdup(cmdline, GFP_KERNEL); - if (!buf) - return -ENOMEM; - - next_parts = parts; - - while (next && *pbuf) { - next = strchr(pbuf, ';'); - if (next) - *next = '\0'; - - ret = parse_parts(next_parts, pbuf); - if (ret) - goto fail; - - if (next) - pbuf = ++next; - - next_parts = &(*next_parts)->next_parts; - } - - if (!*parts) { - pr_warn("cmdline partition has no valid partition."); - ret = -EINVAL; - goto fail; - } - - ret = 0; -done: - kfree(buf); - return ret; - -fail: - cmdline_parts_free(parts); - goto done; -} -EXPORT_SYMBOL(cmdline_parts_parse); - -struct cmdline_parts *cmdline_parts_find(struct cmdline_parts *parts, - const char *bdev) -{ - while (parts && strncmp(bdev, parts->name, sizeof(parts->name))) - parts = parts->next_parts; - return parts; -} -EXPORT_SYMBOL(cmdline_parts_find); - -/* - * add_part() - * 0 success. - * 1 can not add so many partitions. - */ -int cmdline_parts_set(struct cmdline_parts *parts, sector_t disk_size, - int slot, - int (*add_part)(int, struct cmdline_subpart *, void *), - void *param) -{ - sector_t from = 0; - struct cmdline_subpart *subpart; - - for (subpart = parts->subpart; subpart; - subpart = subpart->next_subpart, slot++) { - if (subpart->from == (sector_t)(~0ULL)) - subpart->from = from; - else - from = subpart->from; - - if (from >= disk_size) - break; - - if (subpart->size > (disk_size - from)) - subpart->size = disk_size - from; - - from += subpart->size; - - if (add_part(slot, subpart, param)) - break; - } - - return slot; -} -EXPORT_SYMBOL(cmdline_parts_set); |