-struct osd_check_lmv_buf {
-#ifdef HAVE_DIR_CONTEXT
- /* please keep it as first member */
- struct dir_context ctx;
-#endif
- struct osd_thread_info *oclb_info;
- struct osd_device *oclb_dev;
- struct osd_idmap_cache *oclb_oic;
-};
-
-/**
- * It is called internally by ->readdir() to filter out the
- * local slave object's FID of the striped directory.
- *
- * \retval 1 found the local slave's FID
- * \retval 0 continue to check next item
- * \retval -ve for failure
- */
-#ifdef HAVE_FILLDIR_USE_CTX
-static int osd_stripe_dir_filldir(struct dir_context *buf,
-#else
-static int osd_stripe_dir_filldir(void *buf,
-#endif
- const char *name, int namelen,
- loff_t offset, __u64 ino, unsigned d_type)
-{
- struct osd_check_lmv_buf *oclb = (struct osd_check_lmv_buf *)buf;
- struct osd_thread_info *oti = oclb->oclb_info;
- struct lu_fid *fid = &oti->oti_fid3;
- struct osd_inode_id *id = &oti->oti_id3;
- struct osd_device *dev = oclb->oclb_dev;
- struct osd_idmap_cache *oic = oclb->oclb_oic;
- struct inode *inode;
- int rc;
-
- if (name[0] == '.')
- return 0;
-
- fid_zero(fid);
- sscanf(name + 1, SFID, RFID(fid));
- if (!fid_is_sane(fid))
- return 0;
-
- if (osd_remote_fid(oti->oti_env, dev, fid))
- return 0;
-
- osd_id_gen(id, ino, OSD_OII_NOGEN);
- inode = osd_iget(oti, dev, id);
- if (IS_ERR(inode))
- return PTR_ERR(inode);
-
- iput(inode);
- osd_add_oi_cache(oti, dev, id, fid);
- oic->oic_fid = *fid;
- oic->oic_lid = *id;
- oic->oic_dev = dev;
- rc = osd_oii_insert(dev, oic, true);
-
- return rc == 0 ? 1 : rc;
-}
-
-/* When lookup item under striped directory, we need to locate the master
- * MDT-object of the striped directory firstly, then the client will send
- * lookup (getattr_by_name) RPC to the MDT with some slave MDT-object's FID
- * and the item's name. If the system is restored from MDT file level backup,
- * then before the OI scrub completely built the OI files, the OI mappings of
- * the master MDT-object and slave MDT-object may be invalid. Usually, it is
- * not a problem for the master MDT-object. Because when locate the master
- * MDT-object, we will do name based lookup (for the striped directory itself)
- * firstly, during such process we can setup the correct OI mapping for the
- * master MDT-object. But it will be trouble for the slave MDT-object. Because
- * the client will not trigger name based lookup on the MDT to locate the slave
- * MDT-object before locating item under the striped directory, then when
- * osd_fid_lookup(), it will find that the OI mapping for the slave MDT-object
- * is invalid and does not know what the right OI mapping is, then the MDT has
- * to return -EINPROGRESS to the client to notify that the OI scrub is rebuiding
- * the OI file, related OI mapping is unknown yet, please try again later. And
- * then client will re-try the RPC again and again until related OI mapping has
- * been updated. That is quite inefficient.
- *
- * To resolve above trouble, we will handle it as the following two cases:
- *
- * 1) The slave MDT-object and the master MDT-object are on different MDTs.
- * It is relative easy. Be as one of remote MDT-objects, the slave MDT-object
- * is linked under /REMOTE_PARENT_DIR with the name of its FID string.
- * We can locate the slave MDT-object via lookup the /REMOTE_PARENT_DIR
- * directly. Please check osd_fid_lookup().
- *
- * 2) The slave MDT-object and the master MDT-object reside on the same MDT.
- * Under such case, during lookup the master MDT-object, we will lookup the
- * slave MDT-object via readdir against the master MDT-object, because the
- * slave MDT-objects information are stored as sub-directories with the name
- * "${FID}:${index}". Then when find the local slave MDT-object, its OI
- * mapping will be recorded. Then subsequent osd_fid_lookup() will know
- * the correct OI mapping for the slave MDT-object. */
-static int osd_check_lmv(struct osd_thread_info *oti, struct osd_device *dev,
- struct inode *inode, struct osd_idmap_cache *oic)
-{
- struct lu_buf *buf = &oti->oti_big_buf;
- struct dentry *dentry = &oti->oti_obj_dentry;
- struct file *filp = &oti->oti_file;
- const struct file_operations *fops;
- struct lmv_mds_md_v1 *lmv1;
- struct osd_check_lmv_buf oclb = {
-#ifdef HAVE_DIR_CONTEXT
- .ctx.actor = osd_stripe_dir_filldir,
-#endif
- .oclb_info = oti,
- .oclb_dev = dev,
- .oclb_oic = oic
- };
- int rc = 0;
- ENTRY;
-
-again:
- rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LMV, buf->lb_buf,
- buf->lb_len);
- if (rc == -ERANGE) {
- rc = __osd_xattr_get(inode, dentry, XATTR_NAME_LMV, NULL, 0);
- if (rc > 0) {
- lu_buf_realloc(buf, rc);
- if (buf->lb_buf == NULL)
- GOTO(out, rc = -ENOMEM);
-
- goto again;
- }
- }
-
- if (unlikely(rc == 0 || rc == -ENODATA))
- GOTO(out, rc = 0);
-
- if (rc < 0)
- GOTO(out, rc);
-
- if (unlikely(buf->lb_buf == NULL)) {
- lu_buf_realloc(buf, rc);
- if (buf->lb_buf == NULL)
- GOTO(out, rc = -ENOMEM);
-
- goto again;
- }
-
- lmv1 = buf->lb_buf;
- if (le32_to_cpu(lmv1->lmv_magic) != LMV_MAGIC_V1)
- GOTO(out, rc = 0);
-
- fops = inode->i_fop;
- dentry->d_inode = inode;
- dentry->d_sb = inode->i_sb;
- filp->f_pos = 0;
- filp->f_path.dentry = dentry;
- filp->f_mode = FMODE_64BITHASH;
- filp->f_mapping = inode->i_mapping;
- filp->f_op = fops;
- filp->private_data = NULL;
- set_file_inode(filp, inode);
-
-#ifdef HAVE_DIR_CONTEXT
- oclb.ctx.pos = filp->f_pos;
- rc = fops->iterate(filp, &oclb.ctx);
- filp->f_pos = oclb.ctx.pos;
-#else
- rc = fops->readdir(filp, &oclb, osd_stripe_dir_filldir);
-#endif
- fops->release(inode, filp);
-
-out:
- RETURN(rc >= 0 ? 0 : rc);
-}
-
git://git.whamcloud.com / fs / lustre-release.git / commitdiff