函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\power\swap.c Create Date:2022-07-27 11:03:12
Last Modify:2020-03-12 14:18:49 Copyright©Brick
首页 函数Tree
注解内核,赢得工具下载SCCTEnglish

函数名称：load_image_lzo - Load compressed image data and decompress them with LZO.*@handle: Swap map handle to use for loading data.*@snapshot: Image to copy uncompressed data into.*@nr_to_read: Number of pages to load.

函数原型：static int load_image_lzo(struct swap_map_handle *handle, struct snapshot_handle *snapshot, unsigned int nr_to_read)

返回类型：int

参数：

类型参数名称
struct swap_map_handle *handle
struct snapshot_handle *snapshot
unsigned intnr_to_read
1159  ret等于0
1160  eof等于0
1167  ring等于0, pg等于0, ring_size等于0, have等于0, asked等于0
1169  read_pages等于0
1170  unsigned char * * page = NULL
1171  struct dec_data * data = NULL
1172  struct crc_data * crc = NULL
1174  hib_init_batch( & hb)
1180  nr_threads等于num_online_cpus()减1
1181  nr_threads等于clamp_val - return a value clamped to a given range using val's type*@val: current value*@lo: minimum allowable value*@hi: maximum allowable value* This macro does no typechecking and uses temporary variables of whatever* type the input argument @val is(nr_threads, 1, Maximum number of threads for compression/decompression. )
1183  page等于vmalloc(array_size() - Calculate size of 2-dimensional array.*@a: dimension one*@b: dimension two* Calculates size of 2-dimensional array: @a *@b.* Returns: number of bytes needed to represent the array or SIZE_MAX on* overflow.)
1184  如果非page则
1185  打印错误信息("Failed to allocate LZO page\n")
1186  ret等于负ENOMEM
1187  转到:out_clean
1190  data等于vmalloc(array_size() - Calculate size of 2-dimensional array.*@a: dimension one*@b: dimension two* Calculates size of 2-dimensional array: @a *@b.* Returns: number of bytes needed to represent the array or SIZE_MAX on* overflow.)
1191  如果非data则
1192  打印错误信息("Failed to allocate LZO data\n")
1193  ret等于负ENOMEM
1194  转到:out_clean
1196  以thr小于nr_threads循环memset( & data[thr], 0, offsetof(structdec_data, go))
1199  crc等于开辟内存
1200  如果非crc则
1201  打印错误信息("Failed to allocate crc\n")
1202  ret等于负ENOMEM
1203  转到:out_clean
1205  memset(crc, 0, offsetof(structcrc_data, go))
1207  clean_pages_on_decompress = true
1212  以thr小于nr_threads循环
1213  init_waitqueue_head( & start decompression )
1214  init_waitqueue_head( & decompression done )
1216  hread 等于kthread_run - create and wake a thread.*@threadfn: the function to run until signal_pending(current).*@data: data ptr for @threadfn.*@namefmt: printf-style name for the thread.* Description: Convenient wrapper for kthread_create() followed by(Deompression function that runs in its own thread., & data[thr], "image_decompress/%u", thr)
1219  如果是错误则
1220  hread = NULL
1221  打印错误信息("Cannot start decompression threads\n")
1222  ret等于负ENOMEM
1223  转到:out_clean
1230  init_waitqueue_head( & start crc update )
1231  init_waitqueue_head( & crc update done )
1233  crc32等于0
1234  points to handle's crc32 等于crc32
1235  以thr小于nr_threads循环
1236  uncompressed data [thr]等于unc
1237  uncompressed lengths [thr]等于uncompressed length
1240  hread 等于kthread_run - create and wake a thread.*@threadfn: the function to run until signal_pending(current).*@data: data ptr for @threadfn.*@namefmt: printf-style name for the thread.* Description: Convenient wrapper for kthread_create() followed by(CRC32 update function that runs in its own thread., crc, "image_crc32")
1241  如果是错误则
1242  hread = NULL
1243  打印错误信息("Cannot start CRC32 thread\n")
1244  ret等于负ENOMEM
1245  转到:out_clean
1255  如果Number of free pages that are not high.大于snapshot_get_image_size()则read_pages等于Number of free pages that are not high.减snapshot_get_image_size()的差除2
1257  read_pages等于clamp_val - return a value clamped to a given range using val's type*@val: current value*@lo: minimum allowable value*@hi: maximum allowable value* This macro does no typechecking and uses temporary variables of whatever* type the input argument @val is(read_pages, Minimum/maximum number of pages for read buffering. , LZO_MAX_RD_PAGES)
1259  以i小于read_pages循环
1260  page[i]等于__get_free_page(i < Number of pages/bytes we need for compressed data (worst case). ? GFP_NOIO | __GFP_HIGH : GFP_NOIO | DOC: Action modifiers* Action modifiers* ~~~~~~~~~~~~~~~~* %__GFP_NOWARN suppresses allocation failure reports.* %__GFP_COMP address compound page metadata.* %__GFP_ZERO returns a zeroed page on success. | __GFP_NORETRY)
1265  如果非page[i]则
1266  如果i小于Number of pages/bytes we need for compressed data (worst case). 则
1267  ring_size等于i
1268  打印错误信息("Failed to allocate LZO pages\n")
1269  ret等于负ENOMEM
1270  转到:out_clean
1271  否则
1272  退出
1276  want等于ring_size等于i
1278  打印信息("Using %u thread(s) for decompression\n", nr_threads)
1279  打印信息("Loading and decompressing image data (%u pages)...\n", nr_to_read)
1281  m等于nr_to_read除10
1282  如果非m则m等于1
1284  nr_pages等于0
1285  start等于ktime_get()
1287  ret等于snapshot_write_next - Get the address to store the next image page.*@handle: Snapshot handle structure to guide the writing.* On the first call, @handle should point to a zeroed snapshot_handle* structure
1288  如果ret小于等于0则转到:out_finish
1291  循环
1292  以非eof且i小于want循环
1293  ret等于swap_read_page(handle, page[ring], & hb)
1294  如果ret则
1299  如果cur且entries[k]则
1301  转到:out_finish
1302  否则
1303  eof等于1
1304  退出
1307  如果ring先自加大于等于ring_size则ring等于0
1310  asked加等于i
1311  want减等于i
1316  如果非have则
1317  如果非asked则退出
1320  ret等于hib_wait_io( & hb)
1321  如果ret则转到:out_finish
1323  have加等于asked
1324  asked等于0
1325  如果eof则eof等于2
1329  如果r current threads 则
1330  wait_event - sleep until a condition gets true*@wq_head: the waitqueue to wait on*@condition: a C expression for the event to wait for* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the*@condition evaluates to true(crc update done , atomic_read( & ady to stop flag ))
1331  atomic_set( & ady to stop flag , 0)
1332  r current threads 等于0
1335  以have且thr小于nr_threads循环
1336  compressed length 等于page[pg]
1337  如果此条件成立可能性小(为编译器优化)(!compressed length || compressed length > lzo1x_worst_compress(LZO_UNC_SIZE))则
1340  打印错误信息("Invalid LZO compressed length\n")
1341  ret等于负1
1342  转到:out_finish
1345  need等于DIV_ROUND_UP(compressed length + We need to remember how much compressed data we need to read. , PAGE_SIZE)
1347  如果need大于have则
1348  如果eof大于1则
1349  ret等于负1
1350  转到:out_finish
1352  退出
1355  以off小于We need to remember how much compressed data we need to read. 加compressed length 循环
1358  内存复制(cmp + off, page[pg], PAGE_SIZE)
1360  have自减
1361  want自加
1362  如果pg先自加大于等于ring_size则pg等于0
1366  atomic_set( & ady to start flag , 1)
1367  wake_up( & start decompression )
1373  如果have小于Number of pages/bytes we need for compressed data (worst case). 且asked则
1374  ret等于hib_wait_io( & hb)
1375  如果ret则转到:out_finish
1377  have加等于asked
1378  asked等于0
1379  如果eof则eof等于2
1383  以thr小于run_threads循环
1384  wait_event - sleep until a condition gets true*@wq_head: the waitqueue to wait on*@condition: a C expression for the event to wait for* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the*@condition evaluates to true(decompression done , atomic_read( & ady to stop flag ))
1386  atomic_set( & ady to stop flag , 0)
1388  ret等于urn code
1390  如果ret小于0则
1391  打印错误信息("LZO decompression failed\n")
1392  转到:out_finish
1395  如果此条件成立可能性小(为编译器优化)(!uncompressed length || uncompressed length > LZO_UNC_SIZE || uncompressed length & (PAGE_SIZE - 1))则
1398  打印错误信息("Invalid LZO uncompressed length\n")
1399  ret等于负1
1400  转到:out_finish
1403  以off小于uncompressed length 循环
1423  r current threads 等于thr
1424  atomic_set( & ady to start flag , 1)
1425  wake_up( & start crc update )
1428  out_finish :
1429  如果r current threads 则
1430  wait_event - sleep until a condition gets true*@wq_head: the waitqueue to wait on*@condition: a C expression for the event to wait for* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the*@condition evaluates to true(crc update done , atomic_read( & ady to stop flag ))
1431  atomic_set( & ady to stop flag , 0)
1433  stop等于ktime_get()
1434  如果非ret则
1435  打印信息("Image loading done\n")
1436  snapshot_write_finalize - Complete the loading of a hibernation image.* Must be called after the last call to snapshot_write_next() in case the last* page in the image happens to be a highmem page and its contents should be* stored in highmem
1437  如果非snapshot_image_loaded(snapshot)则ret等于负ENODATA
1439  如果非ret则
1440  如果 Flags to pass to the "boot" kernel 按位与SF_CRC32_MODE则
1441  如果crc32不等于crc32则
1442  打印错误信息("Invalid image CRC32!\n")
1443  ret等于负ENODATA
1448  swsusp_show_speed - Print time elapsed between two events during hibernation.*@start: Starting event.*@stop: Final event.*@nr_pages: Number of memory pages processed between @start and @stop.*@msg: Additional diagnostic message to print.
1449  out_clean :
1450  以i小于ring_size循环free_page((unsignedlong)page[i])
1452  如果crc则
1453  如果hread 则结束线程的运行
1455  释放内存
1457  如果data则
1458  以thr小于nr_threads循环如果hread 则
1460  结束线程的运行
1461  vfree(data)
1463  vfree(page)
1465  返回:ret
调用者
名称描述
swsusp_readswsusp_read - read the hibernation image.*@flags_p: flags passed by the "frozen" kernel in the image header should* be written into this memory location