*参照元 [#la934b18] #backlinks *説明 [#k3894d75] -パス: [[linux-2.6.33/fs/read_write.c]] -FIXME: これは何? --説明 **引数 [#wb06405f] -struct file *filep -- --[[linux-2.6.33/file]] -char __user *buf -- -size_t len -- -loff_t *ppos -- **返り値 [#ra180e4f] -ssize_t -- **参考 [#i48bec03] -標準の非同期 read 関数を使用するファイルシステム .aio_read=generic_file_aio_read, fs/9p/vfs_file.c: .aio_read=generic_file_aio_read, fs/adfs/file.c: .aio_read=generic_file_aio_read, fs/affs/file.c: .aio_read=generic_file_aio_read, fs/afs/file.c: .aio_read=generic_file_aio_read, fs/bfs/file.c: .aio_read=generic_file_aio_read, fs/block_dev.c: .aio_read=generic_file_aio_read, fs/btrfs/file.c: .aio_read=generic_file_aio_read, fs/cifs/cifsfs.c: .aio_read=generic_file_aio_read, fs/cifs/cifsfs.c: .aio_read=generic_file_aio_read, fs/exofs/file.c: .aio_read=generic_file_aio_read, fs/ext2/file.c: .aio_read=generic_file_aio_read, fs/ext3/file.c: .aio_read=generic_file_aio_read, fs/ext4/file.c: .aio_read=generic_file_aio_read, fs/fat/file.c: .aio_read=generic_file_aio_read, fs/gfs2/file.c: .aio_read=generic_file_aio_read, fs/gfs2/file.c: .aio_read=generic_file_aio_read, fs/hfs/inode.c: .aio_read=generic_file_aio_read, fs/hfsplus/inode.c: .aio_read=generic_file_aio_read, fs/hostfs/hostfs_kern.c: .aio_read=generic_file_aio_read, fs/hpfs/file.c: .aio_read=generic_file_aio_read, fs/jffs2/file.c: .aio_read=generic_file_aio_read, fs/jfs/file.c: .aio_read=generic_file_aio_read, fs/minix/file.c: .aio_read=generic_file_aio_read, fs/nilfs2/file.c: .aio_read=generic_file_aio_read, fs/ntfs/file.c: .aio_read=generic_file_aio_read, fs/omfs/file.c: .aio_read=generic_file_aio_read, fs/ramfs/file-mmu.c: .aio_read=generic_file_aio_read, fs/ramfs/file-nommu.c: .aio_read=generic_file_aio_read, fs/read_write.c: .aio_read=generic_file_aio_read, fs/reiserfs/file.c: .aio_read=generic_file_aio_read, fs/romfs/mmap-nommu.c: .aio_read=generic_file_aio_read, fs/sysv/file.c: .aio_read=generic_file_aio_read, fs/ubifs/file.c: .aio_read=generic_file_aio_read, fs/udf/file.c: .aio_read=generic_file_aio_read, fs/ufs/file.c: -独自の非同期 read 関数を使用するファイルシステム .aio_read=bad_file_aio_read, fs/bad_inode.c: .aio_read=ecryptfs_read_update_atime, fs/ecryptfs/file.c: .aio_read=fuse_dev_read, fs/fuse/dev.c: .aio_read=fuse_file_aio_read, fs/fuse/file.c: .aio_read=nfs_file_read, fs/nfs/file.c: .aio_read=pipe_read, fs/pipe.c: .aio_read=pipe_read, fs/pipe.c: .aio_read=ocfs2_file_aio_read, fs/ocfs2/file.c: .aio_read=ocfs2_file_aio_read, fs/ocfs2/file.c: .aio_read=smb_file_aio_read, fs/smbfs/file.c: .aio_read=xfs_file_aio_read, fs/xfs/linux-2.6/xfs_file.c: *実装 [#bd881cf9] ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) { struct iovec iov = { .iov_base = buf, .iov_len = len }; struct kiocb kiocb; ssize_t ret; - --[[linux-2.6.33/iovec]] - --[[linux-2.6.33/kiocb]] init_sync_kiocb(&kiocb, filp); kiocb.ki_pos = *ppos; kiocb.ki_left = len; - --[[linux-2.6.33/init_sync_kiocb()]] for (;;) { ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos); if (ret != -EIOCBRETRY) break; -file->f_op は file_operations 型 --[[linux-2.6.33/file_operations]] -多くのファイルシステムで generic_file_aio_read() を使用する(「参考」章に記載)。 --[[linux-2.6.33/generic_file_aio_read()]] wait_on_retry_sync_kiocb(&kiocb); - --[[linux-2.6.33/wait_on_retry_sync_kiocb()]] } if (-EIOCBQUEUED == ret) ret = wait_on_sync_kiocb(&kiocb); - --[[linux-2.6.33/wait_on_sync_kiocb()]] *ppos = kiocb.ki_pos; return ret; } EXPORT_SYMBOL(do_sync_read); -特にライセンスを区別せずシンボルを公開する。 --[[linux-2.6.33/EXPORT_SYMBOL()]] *コメント [#s574505d]