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ceph: allow sync_read/write return partial successed size of read/write.

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commit ee7289bfad upstream.

For sync_read/write, it may do multi stripe operations.If one of those
met erro, we return the former successed size rather than a error value.
There is a exception for write-operation met -EOLDSNAPC.If this occur,we
retry the whole write again.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
majianpeng 2013-08-21 15:02:51 +08:00 committed by Greg Kroah-Hartman
parent 533bc2950e
commit 30379f4553
1 changed files with 3 additions and 1 deletions
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4
fs/ceph/file.c
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@ -373,7 +373,7 @@ static int striped_read(struct inode *inode,
goto more;
}
if (ret >= 0) {
if (read > 0) {
ret = read;
/* did we bounce off eof? */
if (pos + left > inode->i_size)
@ -611,6 +611,8 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
if (check_caps)
ceph_check_caps(ceph_inode(inode), CHECK_CAPS_AUTHONLY,
NULL);
} else if (ret != -EOLDSNAPC && written > 0) {
ret = written;
}
return ret;
}