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authorTao Ma <tao.ma@oracle.com>2010-05-13 22:49:05 +0800
committerJoel Becker <joel.becker@oracle.com>2010-05-18 16:41:39 -0700
commit5f5261acb059f43c7fb9a2fac9d32c6ef4df2ed5 (patch)
treec4f7e8f4b774ff3bb7b0e60f4bb956729e51d5b6
parentd9ef75221a6247b758e1d7e18edb661996e4b7cf (diff)
ocfs2: Don't retry xattr set in case value extension fails.
In normal xattr set, the set sequence is inode, xattr block and finally xattr bucket if we meet with a ENOSPC. But there is a corner case. So consider we will set a xattr whose value will be stored in a cluster, and there is no xattr block by now. So we will reserve 1 xattr block and 1 cluster for setting it. Now if we fail in value extension(in case the volume is almost full and we can't allocate the cluster because the check in ocfs2_test_bg_bit_allocatable), ENOSPC will be returned. So we will try to create a bucket(this time there is a chance that the reserved cluster will be used), and when we try value extension again, kernel bug happens. We did meet with it. Check the bug below. http://oss.oracle.com/bugzilla/show_bug.cgi?id=1251 This patch just try to avoid this by adding a set_abort in ocfs2_xattr_set_ctxt, so in case ENOSPC happens in value extension, we will check whether it is caused by the real ENOSPC or just the full of inode or xattr block. If it is the first case, we set set_abort so that we don't try any further. we are safe to exit directly here ince it is really ENOSPC. Signed-off-by: Tao Ma <tao.ma@oracle.com> Signed-off-by: Joel Becker <joel.becker@oracle.com>
-rw-r--r--fs/ocfs2/xattr.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index e87130f44cb7..98ee6c44102d 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -79,6 +79,7 @@ struct ocfs2_xattr_set_ctxt {
struct ocfs2_alloc_context *meta_ac;
struct ocfs2_alloc_context *data_ac;
struct ocfs2_cached_dealloc_ctxt dealloc;
+ int set_abort;
};
#define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
@@ -2135,6 +2136,7 @@ alloc_value:
orig_clusters = ocfs2_xa_value_clusters(loc);
rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
if (rc < 0) {
+ ctxt->set_abort = 1;
ocfs2_xa_cleanup_value_truncate(loc, "growing",
orig_clusters);
/*
@@ -2946,7 +2948,7 @@ static int ocfs2_xattr_block_set(struct inode *inode,
ret = ocfs2_xa_set(&loc, xi, ctxt);
if (!ret)
xs->here = loc.xl_entry;
- else if (ret != -ENOSPC)
+ else if ((ret != -ENOSPC) || ctxt->set_abort)
goto end;
else {
ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
@@ -3308,7 +3310,7 @@ static int __ocfs2_xattr_set_handle(struct inode *inode,
goto out;
}
ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
- } else if (ret == -ENOSPC) {
+ } else if ((ret == -ENOSPC) && !ctxt->set_abort) {
if (di->i_xattr_loc && !xbs->xattr_bh) {
ret = ocfs2_xattr_block_find(inode,
xi->xi_name_index,