On Tue, Jan 19, 2010 at 10:14:09AM -0800, Linus Torvalds wrote:
> (Btw, you could just remove the whole BLKID_SB_BUFSIZ logic in the first
Done. Now the code calls read() for necessary data only. Results:
whole-disk:
$ LD_LIBRARY_PATH=shlibs/blkid/src/.libs \
strace -s -T8 -e read ./misc-utils/.libs/blkid -p -o udev fat12-linus.img
read(3, ""..., 832) = 832
read(3, ""..., 832) = 832
read(3, ""..., 832) = 832
read(3, ""..., 1024) = 1024
ID_PART_TABLE_TYPE=dos
... 1024 bytes
partition:
$ LD_LIBRARY_PATH=shlibs/blkid/src/.libs \
strace -s -T8 -e read ./misc-utils/.libs/blkid -p -o udev -O 16384 fat12-linus.img
read(3, ""..., 832) = 832
read(3, ""..., 832) = 832
read(3, ""..., 832) = 832
read(3, ""..., 1024) = 1024
read(3, ""..., 32) = 32
ID_FS_SEC_TYPE=msdos
ID_FS_VERSION=FAT12
ID_FS_TYPE=vfat
ID_FS_USAGE=filesystem
... 1056 bytes
For normal large disks where we probe for RAIDs and all filesystems it's ~ 30kB.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
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