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ceph: sync read/write considers page cache 

In the cases where we either do a sync read or a write, we
need to make sure that everything in the page cache is flushed.
In the case of a sync write we invalidate the relevant pages,
so that subsequent read/write reflects the new data written.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Yehuda Sadeh 2010-02-09 11:14:41 -08:00 committed by Sage Weil
parent 3d497d858a
commit 29065a513a
1 changed files with 16 additions and 2 deletions
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18
fs/ceph/file.c
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@ -409,7 +409,7 @@ static void zero_page_vector_range(int off, int len, struct page **pages)
i++;
}
while (len >= PAGE_CACHE_SIZE) {
dout("zeroing %d %p\n", i, pages[i]);
dout("zeroing %d %p len=%d\n", i, pages[i], len);
zero_user_segment(pages[i], 0, PAGE_CACHE_SIZE);
len -= PAGE_CACHE_SIZE;
i++;
@ -542,13 +542,16 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,
* but it will at least behave sensibly when they are
* in sequence.
*/
filemap_write_and_wait(inode->i_mapping);
} else {
pages = alloc_page_vector(num_pages);
}
if (IS_ERR(pages))
return PTR_ERR(pages);
ret = filemap_write_and_wait(inode->i_mapping);
if (ret < 0)
goto done;
ret = striped_read(inode, off, len, pages, num_pages);
if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
@ -556,6 +559,7 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,
if (ret >= 0)
*poff = off + ret;
done:
if (file->f_flags & O_DIRECT)
put_page_vector(pages, num_pages);
else
@ -617,6 +621,16 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
else
pos = *offset;
ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
if (ret < 0)
return ret;
ret = invalidate_inode_pages2_range(inode->i_mapping,
pos >> PAGE_CACHE_SHIFT,
(pos + left) >> PAGE_CACHE_SHIFT);
if (ret < 0)
dout("invalidate_inode_pages2_range returned %d\n", ret);
flags = CEPH_OSD_FLAG_ORDERSNAP |
CEPH_OSD_FLAG_ONDISK |
CEPH_OSD_FLAG_WRITE;