linux-kernel - [PATCH] ceph: Correctly return NXIO errors from ceph

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Message-Id: <20160721174310.21805-1-phil.turnbull@oracle.com>
Date:	Thu, 21 Jul 2016 13:43:09 -0400
From:	Phil Turnbull <phil.turnbull@...cle.com>
To:	ceph-devel@...r.kernel.org
Cc:	Phil Turnbull <phil.turnbull@...cle.com>,
	"Yan, Zheng" <zyan@...hat.com>, Sage Weil <sage@...hat.com>,
	Ilya Dryomov <idryomov@...il.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ceph: Correctly return NXIO errors from ceph_llseek.

ceph_llseek does not correctly return NXIO errors because the 'out' path
always returns 'offset'.

Fixes: 06222e491e66 ("fs: handle SEEK_HOLE/SEEK_DATA properly in all fs's that define their own llseek")
Signed-off-by: Phil Turnbull <phil.turnbull@...cle.com>
---
 fs/ceph/file.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index ce2f5795e44b..13adb5b2ef29 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -1448,16 +1448,14 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
 {
 	struct inode *inode = file->f_mapping->host;
 	loff_t i_size;
-	int ret;
+	loff_t ret;
 
 	inode_lock(inode);
 
 	if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
 		ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
-		if (ret < 0) {
-			offset = ret;
+		if (ret < 0)
 			goto out;
-		}
 	}
 
 	i_size = i_size_read(inode);
@@ -1473,7 +1471,7 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
 		 * write() or lseek() might have altered it
 		 */
 		if (offset == 0) {
-			offset = file->f_pos;
+			ret = file->f_pos;
 			goto out;
 		}
 		offset += file->f_pos;
@@ -1493,11 +1491,11 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
 		break;
 	}
 
-	offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
+	ret = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
 
 out:
 	inode_unlock(inode);
-	return offset;
+	return ret;
 }
 
 static inline void ceph_zero_partial_page(
-- 
2.9.0.rc2