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NFS: Writeback optimisation

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Schedule writes using WB_SYNC_NONE first, then come back for a second pass
using WB_SYNC_ALL.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-07-25 14:09:54 -04:00
parent ed90ef51a3
commit 34901f70d1
1 changed files with 22 additions and 10 deletions
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32
fs/nfs/write.c
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@ -1325,21 +1325,14 @@ long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_contr
return ret; return ret;
} }
static int nfs_write_mapping(struct address_space *mapping, int how) static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
{ {
struct writeback_control wbc = {
.bdi = mapping->backing_dev_info,
.sync_mode = WB_SYNC_ALL,
.nr_to_write = LONG_MAX,
.for_writepages = 1,
.range_cyclic = 1,
};
int ret; int ret;
ret = nfs_writepages(mapping, &wbc); ret = nfs_writepages(mapping, wbc);
if (ret < 0) if (ret < 0)
goto out; goto out;
ret = nfs_sync_mapping_wait(mapping, &wbc, how); ret = nfs_sync_mapping_wait(mapping, wbc, how);
if (ret < 0) if (ret < 0)
goto out; goto out;
return 0; return 0;
@ -1348,6 +1341,25 @@ out:
return ret; return ret;
} }
/* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */
static int nfs_write_mapping(struct address_space *mapping, int how)
{
struct writeback_control wbc = {
.bdi = mapping->backing_dev_info,
.sync_mode = WB_SYNC_NONE,
.nr_to_write = LONG_MAX,
.for_writepages = 1,
.range_cyclic = 1,
};
int ret;
ret = __nfs_write_mapping(mapping, &wbc, how);
if (ret < 0)
return ret;
wbc.sync_mode = WB_SYNC_ALL;
return __nfs_write_mapping(mapping, &wbc, how);
}
/* /*
* flush the inode to disk. * flush the inode to disk.
*/ */