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xfs: rename xfs_buf_get_nodaddr to be more appropriate 

xfs_buf_get_nodaddr() is really used to allocate a buffer that is
uncached. While it is not directly assigned a disk address, the fact
that they are not cached is a more important distinction. With the
upcoming uncached buffer read primitive, we should be consistent
with this disctinction.

While there, make page allocation in xfs_buf_get_nodaddr() safe
against memory reclaim re-entrancy into the filesystem by allowing
a flags parameter to be passed.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Dave Chinner 2010-09-24 20:07:47 +10:00 committed by Alex Elder
parent dcd79a1423
commit 686865f76e
6 changed files with 14 additions and 11 deletions
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9
fs/xfs/linux-2.6/xfs_buf.c
View File

@ -707,9 +707,10 @@ xfs_buf_associate_memory(
}
xfs_buf_t *
xfs_buf_get_noaddr(
xfs_buf_get_uncached(
struct xfs_buftarg *target,
size_t len,
xfs_buftarg_t *target)
int flags)
{
unsigned long page_count = PAGE_ALIGN(len) >> PAGE_SHIFT;
int error, i;
@ -725,7 +726,7 @@ xfs_buf_get_noaddr(
goto fail_free_buf;
for (i = 0; i < page_count; i++) {
bp->b_pages[i] = alloc_page(GFP_KERNEL);
bp->b_pages[i] = alloc_page(xb_to_gfp(flags));
if (!bp->b_pages[i])
goto fail_free_mem;
}
@ -740,7 +741,7 @@ xfs_buf_get_noaddr(
xfs_buf_unlock(bp);
trace_xfs_buf_get_noaddr(bp, _RET_IP_);
trace_xfs_buf_get_uncached(bp, _RET_IP_);
return bp;
fail_free_mem:

2
fs/xfs/linux-2.6/xfs_buf.h
View File

@ -213,7 +213,7 @@ extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t,
xfs_buf_flags_t);
extern xfs_buf_t *xfs_buf_get_empty(size_t, xfs_buftarg_t *);
extern xfs_buf_t *xfs_buf_get_noaddr(size_t, xfs_buftarg_t *);
extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int);
extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t);
extern void xfs_buf_hold(xfs_buf_t *);
extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t,

2
fs/xfs/linux-2.6/xfs_trace.h
View File

@ -331,7 +331,7 @@ DEFINE_BUF_EVENT(xfs_buf_iowait_done);
DEFINE_BUF_EVENT(xfs_buf_delwri_queue);
DEFINE_BUF_EVENT(xfs_buf_delwri_dequeue);
DEFINE_BUF_EVENT(xfs_buf_delwri_split);
DEFINE_BUF_EVENT(xfs_buf_get_noaddr);
DEFINE_BUF_EVENT(xfs_buf_get_uncached);
DEFINE_BUF_EVENT(xfs_bdstrat_shut);
DEFINE_BUF_EVENT(xfs_buf_item_relse);
DEFINE_BUF_EVENT(xfs_buf_item_iodone);

3
fs/xfs/xfs_log.c
View File

@ -1131,7 +1131,8 @@ xlog_alloc_log(xfs_mount_t *mp,
iclog->ic_prev = prev_iclog;
prev_iclog = iclog;
bp = xfs_buf_get_noaddr(log->l_iclog_size, mp->m_logdev_targp);
bp = xfs_buf_get_uncached(mp->m_logdev_targp,
log->l_iclog_size, 0);
if (!bp)
goto out_free_iclog;
if (!XFS_BUF_CPSEMA(bp))

3
fs/xfs/xfs_log_recover.c
View File

@ -107,7 +107,8 @@ xlog_get_bp(
nbblks += log->l_sectBBsize;
nbblks = round_up(nbblks, log->l_sectBBsize);
return xfs_buf_get_noaddr(BBTOB(nbblks), log->l_mp->m_logdev_targp);
return xfs_buf_get_uncached(log->l_mp->m_logdev_targp,
BBTOB(nbblks), 0);
}
STATIC void

6
fs/xfs/xfs_vnodeops.c
View File

@ -2434,9 +2434,9 @@ xfs_zero_remaining_bytes(
if (endoff > ip->i_size)
endoff = ip->i_size;
bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize,
XFS_IS_REALTIME_INODE(ip) ?
mp->m_rtdev_targp : mp->m_ddev_targp);
bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
mp->m_rtdev_targp : mp->m_ddev_targp,
mp->m_sb.sb_blocksize, XBF_DONT_BLOCK);
if (!bp)
return XFS_ERROR(ENOMEM);