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ceph: skip invalid dentry during dcache readdir

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

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Yan, Zheng 2014-04-06 14:10:04 +08:00 committed by Sage Weil
parent 8a53f23fcd
commit a30be7cb2c
1 changed files with 8 additions and 5 deletions
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13
fs/ceph/dir.c
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@ -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 @@ more:
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 {