Read(User - ext4)

Retired DISLab

(버전 사이의 차이)

이동: 둘러보기, 찾기

@@ 1번째 줄: / 1번째 줄: @@
 <uml>
-(*) --> "read"
+(*) --> "read()"
-"read" --> "SYSCALL_DEFINE3"
+"read()" --> "SYSCALL_DEFINE3()"
-"SYSCALL_DEFINE3" -->  "vfs_read"
-"vfs_read" -->  "do_sync_read"
-"do_sync_read" -->"generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,unsigned long nr_segs, loff_t pos)"
+partition VFS {
+"SYSCALL_DEFINE3()" -->  "vfs_read()"
+-->  "do_sync_read()"
+}
+partition EXT4 {
+"do_sync_read()" -->"generic_file_aio_read"
+--> if "not O_DIRECT" then
+-->"do_generic_file_read()"
+"do_generic_file_read()"-->if "no page" then
+-->"page_cache_sync_readahead()"
+-->"ondemand_readahead()"
+-->"__do_page_cache_readahead()"
+-->"read_pages()"
+"do_generic_file_read()"-->if "PageReadahead(page)" then
+--> "page_cache_async_readahead()"
+-->"ondemand_readahead()"
+-->"__do_page_cache_readahead()"
+-->"read_pages()"
+"do_generic_file_read()"-->"ext4_readpages()"
+-->"mpage_readpages()"
+-->"do_mpage_readpage()"
+-->"mpage_bio_submit()"
+}
+-->"generic_make_request(bio)"
 </uml>

2014년 5월 20일 (화) 14:46 현재 판