05-07-2010
@pludi
hi
i have problem in modified time of file......consider file as modified time as 5:50:35 in ext3 format. if i copy this to fat format pen drive modified time is changing to 5:50:34.......i'm using modified time for file integrity check.... any idea?
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LEARN ABOUT OPENSOLARIS
biomodified
biomodified(9F) Kernel Functions for Drivers biomodified(9F)
NAME
biomodified - check if a buffer is modified
SYNOPSIS
#include <sys/ddi.h>
#include <sys/sunddi.h>
intbiomodified(struct buf *bp);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
PARAMETERS
bp Pointer to the buffer header structure.
DESCRIPTION
The biomodified() function returns status to indicate if the buffer is modified. The biomodified() function is only supported for paged-
I/O request, that is the B_PAGEIO flag must be set in the b_flags field of the buf(9S) structure. The biomodified() function will check
the memory pages associated with this buffer whether the Virtual Memory system's modification bit is set. If at least one of these pages
is modified, the buffer is indicated as modified. A filesystem will mark the pages unmodified when it writes the pages to the backing
store. The biomodified() function can be used to detect any modifications to the memory pages while I/O is in progress.
A device driver can use biomodified() for disk mirroring. An application is allowed to mmap a file which can reside on a disk which is
mirrored by multiple submirrors. If the file system writes the file to the backing store, it is written to all submirrors in parallel. It
must be ensured that the copies on all submirrors are identical. The biomodified() function can be used in the device driver to detect any
modifications to the buffer by the user program during the time the buffer is written to multiple submirrors.
RETURN VALUES
The biomodified() function returns the following values:
1 Buffer is modified.
0 Buffer is not modified.
-1 Buffer is not used for paged I/O request.
CONTEXT
biomodified() can be called from any context.
SEE ALSO
bp_mapin(9F), buf(9S)
Writing Device Drivers
SunOS 5.11 20 Nov 1996 biomodified(9F)