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Commit a30be7cb authored by Yan, Zheng's avatar Yan, Zheng Committed by Sage Weil
Browse files

ceph: skip invalid dentry during dcache readdir 



skip dentries that were added before MDS issued FILE_SHARED to
client.

Signed-off-by: default avatarYan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: default avatarSage Weil <sage@inktank.com>
parent 8a53f23f

fs/ceph/dir.c

+8 −5
Original line number Diff line number Diff line
@@ -119,7 +119,8 @@ static int fpos_cmp(loff_t l, loff_t r) 
 * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by

 * the MDS if/when the directory is modified).

 */

static int __dcache_readdir(struct file *file, struct dir_context *ctx)

static int __dcache_readdir(struct file *file,  struct dir_context *ctx,

			    u32 shared_gen)

{

	struct ceph_file_info *fi = file->private_data;

	struct dentry *parent = file->f_dentry;
@@ -133,8 +134,8 @@ static int __dcache_readdir(struct file *file, struct dir_context *ctx) 
	last = fi->dentry;

	fi->dentry = NULL;



	dout("__dcache_readdir %p at %llu (last %p)\n", dir, ctx->pos,

	     last);

	dout("__dcache_readdir %p v%u at %llu (last %p)\n",

	     dir, shared_gen, ctx->pos, last);



	spin_lock(&parent->d_lock);
@@ -161,7 +162,8 @@ static int __dcache_readdir(struct file *file, struct dir_context *ctx) 
			goto out_unlock;

		}

		spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);

		if (!d_unhashed(dentry) && dentry->d_inode &&

		if (di->lease_shared_gen == shared_gen &&

		    !d_unhashed(dentry) && dentry->d_inode &&

		    ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&

		    ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&

		    fpos_cmp(ctx->pos, di->offset) <= 0)
@@ -289,8 +291,9 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) 
	    ceph_snap(inode) != CEPH_SNAPDIR &&

	    __ceph_dir_is_complete(ci) &&

	    __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1)) {

		u32 shared_gen = ci->i_shared_gen;

		spin_unlock(&ci->i_ceph_lock);

		err = __dcache_readdir(file, ctx);

		err = __dcache_readdir(file, ctx, shared_gen);

		if (err != -EAGAIN)

			return err;

	} else {