cregit-Linux how code gets into the kernel

Release 4.14 block/cmdline-parser.c

Directory: block
// 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; }

Contributors

PersonTokensPropCommitsCommitProp
Cai Zhiyong334100.00%1100.00%
Total334100.00%1100.00%


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); } }

Contributors

PersonTokensPropCommitsCommitProp
Cai Zhiyong43100.00%1100.00%
Total43100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Cai Zhiyong304100.00%1100.00%
Total304100.00%1100.00%


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; } }

Contributors

PersonTokensPropCommitsCommitProp
Cai Zhiyong49100.00%1100.00%
Total49100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Cai Zhiyong175100.00%1100.00%
Total175100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Cai Zhiyong46100.00%1100.00%
Total46100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Cai Zhiyong142100.00%2100.00%
Total142100.00%2100.00%

EXPORT_SYMBOL(cmdline_parts_set);

Overall Contributors

PersonTokensPropCommitsCommitProp
Cai Zhiyong112199.91%266.67%
Greg Kroah-Hartman10.09%133.33%
Total1122100.00%3100.00%
Directory: block
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.