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xfs: make XBF_MAPPED the default behaviour

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Rather than specifying XBF_MAPPED for almost all buffers, introduce
XBF_UNMAPPED for the couple of users that use unmapped buffers.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner 2012-04-23 15:59:07 +10:00 • committed by Ben Myers
parent d4f3512b08
commit 611c99468c
7 changed files with 24 additions and 32 deletions
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28
fs/xfs/xfs_buf.c
View file

@ -65,11 +65,11 @@ xfs_buf_is_vmapped(
/*
* Return true if the buffer is vmapped.
*
* The XBF_MAPPED flag is set if the buffer should be mapped, but the
* code is clever enough to know it doesn't have to map a single page,
* so the check has to be both for XBF_MAPPED and bp->b_page_count > 1.
* b_addr is null if the buffer is not mapped, but the code is clever
* enough to know it doesn't have to map a single page, so the check has
* to be both for b_addr and bp->b_page_count > 1.
*/
return (bp->b_flags & XBF_MAPPED) && bp->b_page_count > 1;
return bp->b_addr && bp->b_page_count > 1;
}
static inline int
@ -181,7 +181,7 @@ xfs_buf_alloc(
* We don't want certain flags to appear in b_flags unless they are
* specifically set by later operations on the buffer.
*/
flags &= ~(XBF_MAPPED | XBF_TRYLOCK | XBF_ASYNC | XBF_READ_AHEAD);
flags &= ~(XBF_UNMAPPED | XBF_TRYLOCK | XBF_ASYNC | XBF_READ_AHEAD);
atomic_set(&bp->b_hold, 1);
atomic_set(&bp->b_lru_ref, 1);
@ -329,7 +329,7 @@ xfs_buf_allocate_memory(
bp->b_pages = bp->b_page_array;
bp->b_pages[0] = virt_to_page(bp->b_addr);
bp->b_page_count = 1;
bp->b_flags |= XBF_MAPPED | _XBF_KMEM;
bp->b_flags |= _XBF_KMEM;
return 0;
}
@ -399,8 +399,9 @@ _xfs_buf_map_pages(
if (bp->b_page_count == 1) {
/* A single page buffer is always mappable */
bp->b_addr = page_address(bp->b_pages[0]) + bp->b_offset;
bp->b_flags |= XBF_MAPPED;
} else if (flags & XBF_MAPPED) {
} else if (flags & XBF_UNMAPPED) {
bp->b_addr = NULL;
} else {
int retried = 0;
do {
@ -414,7 +415,6 @@ _xfs_buf_map_pages(
if (!bp->b_addr)
return -ENOMEM;
bp->b_addr += bp->b_offset;
bp->b_flags |= XBF_MAPPED;
}
return 0;
@ -520,7 +520,7 @@ found:
*/
if (bp->b_flags & XBF_STALE) {
ASSERT((bp->b_flags & _XBF_DELWRI_Q) == 0);
bp->b_flags &= XBF_MAPPED | _XBF_KMEM | _XBF_PAGES;
bp->b_flags &= _XBF_KMEM | _XBF_PAGES;
}
trace_xfs_buf_find(bp, flags, _RET_IP_);
@ -575,7 +575,7 @@ xfs_buf_get(
bp->b_io_length = bp->b_length;
found:
if (!(bp->b_flags & XBF_MAPPED)) {
if (!bp->b_addr) {
error = _xfs_buf_map_pages(bp, flags);
if (unlikely(error)) {
xfs_warn(target->bt_mount,
@ -707,7 +707,6 @@ xfs_buf_set_empty(
bp->b_length = numblks;
bp->b_io_length = numblks;
bp->b_bn = XFS_BUF_DADDR_NULL;
bp->b_flags &= ~XBF_MAPPED;
}
static inline struct page *
@ -759,7 +758,6 @@ xfs_buf_associate_memory(
bp->b_io_length = BTOBB(len);
bp->b_length = BTOBB(buflen);
bp->b_flags |= XBF_MAPPED;
return 0;
}
@ -790,7 +788,7 @@ xfs_buf_get_uncached(
}
bp->b_flags |= _XBF_PAGES;
error = _xfs_buf_map_pages(bp, XBF_MAPPED);
error = _xfs_buf_map_pages(bp, 0);
if (unlikely(error)) {
xfs_warn(target->bt_mount,
"%s: failed to map pages\n", __func__);
@ -1287,7 +1285,7 @@ xfs_buf_offset(
{
struct page *page;
if (bp->b_flags & XBF_MAPPED)
if (bp->b_addr)
return bp->b_addr + offset;
offset += bp->b_offset;

4
fs/xfs/xfs_buf.h
View file

@ -41,7 +41,6 @@ typedef enum {
#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 */
#define XBF_MAPPED (1 << 3) /* buffer mapped (b_addr valid) */
#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
#define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */
@ -53,6 +52,7 @@ typedef enum {
/* flags used only as arguments to access routines */
#define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */
#define XBF_UNMAPPED (1 << 17)/* do not map the buffer */
/* flags used only internally */
#define _XBF_PAGES (1 << 20)/* backed by refcounted pages */
@ -65,7 +65,6 @@ typedef unsigned int xfs_buf_flags_t;
{ XBF_READ, "READ" }, \
{ XBF_WRITE, "WRITE" }, \
{ XBF_READ_AHEAD, "READ_AHEAD" }, \
{ XBF_MAPPED, "MAPPED" }, \
{ XBF_ASYNC, "ASYNC" }, \
{ XBF_DONE, "DONE" }, \
{ XBF_STALE, "STALE" }, \
@ -73,6 +72,7 @@ typedef unsigned int xfs_buf_flags_t;
{ XBF_FUA, "FUA" }, \
{ XBF_FLUSH, "FLUSH" }, \
{ XBF_TRYLOCK, "TRYLOCK" }, /* should never be set */\
{ XBF_UNMAPPED, "UNMAPPED" }, /* ditto */\
{ _XBF_PAGES, "PAGES" }, \
{ _XBF_KMEM, "KMEM" }, \
{ _XBF_DELWRI_Q, "DELWRI_Q" }

10
fs/xfs/xfs_fsops.c
View file

@ -190,7 +190,7 @@ xfs_growfs_data_private(
*/
bp = xfs_buf_get(mp->m_ddev_targp,
XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp)),
XFS_FSS_TO_BB(mp, 1), XBF_MAPPED);
XFS_FSS_TO_BB(mp, 1), 0);
if (!bp) {
error = ENOMEM;
goto error0;
@ -227,7 +227,7 @@ xfs_growfs_data_private(
*/
bp = xfs_buf_get(mp->m_ddev_targp,
XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR(mp)),
XFS_FSS_TO_BB(mp, 1), XBF_MAPPED);
XFS_FSS_TO_BB(mp, 1), 0);
if (!bp) {
error = ENOMEM;
goto error0;
@ -256,7 +256,7 @@ xfs_growfs_data_private(
*/
bp = xfs_buf_get(mp->m_ddev_targp,
XFS_AGB_TO_DADDR(mp, agno, XFS_BNO_BLOCK(mp)),
BTOBB(mp->m_sb.sb_blocksize), XBF_MAPPED);
BTOBB(mp->m_sb.sb_blocksize), 0);
if (!bp) {
error = ENOMEM;
goto error0;
@ -282,7 +282,7 @@ xfs_growfs_data_private(
*/
bp = xfs_buf_get(mp->m_ddev_targp,
XFS_AGB_TO_DADDR(mp, agno, XFS_CNT_BLOCK(mp)),
BTOBB(mp->m_sb.sb_blocksize), XBF_MAPPED);
BTOBB(mp->m_sb.sb_blocksize), 0);
if (!bp) {
error = ENOMEM;
goto error0;
@ -309,7 +309,7 @@ xfs_growfs_data_private(
*/
bp = xfs_buf_get(mp->m_ddev_targp,
XFS_AGB_TO_DADDR(mp, agno, XFS_IBT_BLOCK(mp)),
BTOBB(mp->m_sb.sb_blocksize), XBF_MAPPED);
BTOBB(mp->m_sb.sb_blocksize), 0);
if (!bp) {
error = ENOMEM;
goto error0;

1
fs/xfs/xfs_inode.c
View file

@ -150,6 +150,7 @@ xfs_imap_to_bp(
int ni;
xfs_buf_t *bp;
buf_flags |= XBF_UNMAPPED;
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
(int)imap->im_len, buf_flags, &bp);
if (error) {

4
fs/xfs/xfs_log_recover.c
View file

@ -2131,8 +2131,8 @@ xlog_recover_buffer_pass2(
trace_xfs_log_recover_buf_recover(log, buf_f);
buf_flags = 0;
if (!(buf_f->blf_flags & XFS_BLF_INODE_BUF))
buf_flags |= XBF_MAPPED;
if (buf_f->blf_flags & XFS_BLF_INODE_BUF)
buf_flags |= XBF_UNMAPPED;
bp = xfs_buf_read(mp->m_ddev_targp, buf_f->blf_blkno, buf_f->blf_len,
buf_flags);

6
fs/xfs/xfs_trans_buf.c
View file

@ -138,9 +138,6 @@ xfs_trans_get_buf(xfs_trans_t *tp,
xfs_buf_t *bp;
xfs_buf_log_item_t *bip;
if (flags == 0)
flags = XBF_MAPPED;
/*
* Default to a normal get_buf() call if the tp is NULL.
*/
@ -264,9 +261,6 @@ xfs_trans_read_buf(
*bpp = NULL;
if (flags == 0)
flags = XBF_MAPPED;
/*
* Default to a normal get_buf() call if the tp is NULL.
*/

3
fs/xfs/xfs_vnodeops.c
View file

@ -79,8 +79,7 @@ xfs_readlink_bmap(
d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt),
XBF_MAPPED);
bp = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0);
if (!bp)
return XFS_ERROR(ENOMEM);
error = bp->b_error;