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xfs: merge xfs_buf_zero and xfs_buf_iomove 

xfs_buf_zero is the only caller of xfs_buf_iomove.  Remove support
for copying from or to the buffer in xfs_buf_iomove and merge the
two functions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-06-12 08:59:59 -07:00 committed by Darrick J. Wong
parent 8c9ce2f707
commit f9a196ee5a
2 changed files with 6 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
fs/xfs/xfs_buf.c
View File

@ -1613,16 +1613,11 @@ xfs_buf_offset(
return page_address(page) + (offset & (PAGE_SIZE-1));
}
/*
* Move data into or out of a buffer.
*/
void
xfs_buf_iomove(
xfs_buf_t *bp, /* buffer to process */
size_t boff, /* starting buffer offset */
size_t bsize, /* length to copy */
void *data, /* data address */
xfs_buf_rw_t mode) /* read/write/zero flag */
xfs_buf_zero(
struct xfs_buf *bp,
size_t boff,
size_t bsize)
{
size_t bend;
@ -1639,19 +1634,9 @@ xfs_buf_iomove(
ASSERT((csize + page_offset) <= PAGE_SIZE);
switch (mode) {
case XBRW_ZERO:
memset(page_address(page) + page_offset, 0, csize);
break;
case XBRW_READ:
memcpy(data, page_address(page) + page_offset, csize);
break;
case XBRW_WRITE:
memcpy(page_address(page) + page_offset, data, csize);
}
memset(page_address(page) + page_offset, 0, csize);
boff += csize;
data += csize;
}
}

11
fs/xfs/xfs_buf.h
View File

@ -21,12 +21,6 @@
#define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL))
typedef enum {
XBRW_READ = 1, /* transfer into target memory */
XBRW_WRITE = 2, /* transfer from target memory */
XBRW_ZERO = 3, /* Zero target memory */
} xfs_buf_rw_t;
#define XBF_READ (1 << 0) /* buffer intended for reading from device */
#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */
#define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */
@ -305,10 +299,7 @@ static inline int xfs_buf_submit(struct xfs_buf *bp)
return __xfs_buf_submit(bp, wait);
}
extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
xfs_buf_rw_t);
#define xfs_buf_zero(bp, off, len) \
xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO)
void xfs_buf_zero(struct xfs_buf *bp, size_t boff, size_t bsize);
/* Buffer Utility Routines */
extern void *xfs_buf_offset(struct xfs_buf *, size_t);