lkml.org 
[lkml]   [2003]   [Nov]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRe: DIRECT IO for ext3/ext2.
    Date
    > Thanks for your reply. I looked into the boundary alignment issue.
    > Observed something strange happening;
    >
    > I wrote my own kernel module and then;
    > 1. retrieved the block size = 4096 using block_size(struct block_device
    > *bdev)
    > 2. in the user application i did a lseek by 4906 (block size seek)
    > 3. then found the address of the variable i wanted to read into, to be
    > block
    > size aligned.
    >
    > However, the read still seems to fail with the O_DIRECT flag specified.
    > The same check _passes if i do not specify the flag in open of the
    > device.
    >
    > Boundary issues seem to be not the cause of failure here.
    > Would have any more kind suggestions on something that i should do or
    > could be missing on?

    Is the size of the data you are reading also a multiple the block size? (It
    should be.)

    Cheers,

    Michael

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:58    [W:0.020 / U:120.972 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site