*
* Lustre Metadata Server (mdd) routines
*
- * Author: Wang Di <wangdi@clusterfs.com>
+ * Author: Wang Di <wangdi@intel.com>
*/
#define DEBUG_SUBSYSTEM S_MDS
sizeof(dotdot) - 1
};
-static int __mdd_lookup(const struct lu_env *env, struct md_object *pobj,
- const struct lu_name *lname, struct lu_fid* fid,
- int mask);
-static inline int mdd_links_add(const struct lu_env *env,
- struct mdd_object *mdd_obj,
- const struct lu_fid *pfid,
- const struct lu_name *lname,
- struct thandle *handle, int first);
-static inline int mdd_links_del(const struct lu_env *env,
- struct mdd_object *mdd_obj,
- const struct lu_fid *pfid,
- const struct lu_name *lname,
- struct thandle *handle);
+static int __mdd_lookup(const struct lu_env *, struct md_object *,
+ const struct lu_name *, struct lu_fid*, int);
static int
__mdd_lookup_locked(const struct lu_env *env, struct md_object *pobj,
reclen = llog_data_len(sizeof(*rec) +
(fname != NULL ? fname->ln_namelen : 0));
- buf = mdd_buf_alloc(env, reclen);
+ buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_big_buf, reclen);
if (buf->lb_buf == NULL)
return -ENOMEM;
reclen = llog_data_len(sizeof(*rec) +
(tname != NULL ? tname->ln_namelen : 0) +
(sname != NULL ? 1 + sname->ln_namelen : 0));
- buf = mdd_buf_alloc(env, reclen);
+ buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_big_buf, reclen);
if (buf->lb_buf == NULL)
return -ENOMEM;
LASSERT(handle != NULL);
reclen = llog_data_len(sizeof(*rec) + tname->ln_namelen);
- buf = mdd_buf_alloc(env, reclen);
+ buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_big_buf, reclen);
if (buf->lb_buf == NULL)
RETURN(-ENOMEM);
rec = buf->lb_buf;
reclen = llog_data_len(sizeof(*rec) +
sname != NULL ? 1 + sname->ln_namelen : 0);
- buf = mdd_buf_alloc(env, reclen);
+ buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_big_buf, reclen);
if (buf->lb_buf == NULL)
RETURN(-ENOMEM);
rec = buf->lb_buf;
return 0;
}
+static int __mdd_links_add(const struct lu_env *env,
+ struct mdd_object *mdd_obj,
+ struct linkea_data *ldata,
+ const struct lu_name *lname,
+ const struct lu_fid *pfid,
+ int first, int check)
+{
+ int rc;
+
+ if (ldata->ld_leh == NULL) {
+ rc = first ? -ENODATA : mdd_links_read(env, mdd_obj, ldata);
+ if (rc) {
+ if (rc != -ENODATA)
+ return rc;
+ rc = linkea_data_new(ldata,
+ &mdd_env_info(env)->mti_link_buf);
+ if (rc)
+ return rc;
+ }
+ }
+
+ if (check) {
+ rc = linkea_links_find(ldata, lname, pfid);
+ if (rc && rc != -ENOENT)
+ return rc;
+ if (rc == 0)
+ return -EEXIST;
+ }
+
+ if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LINKEA_MORE)) {
+ struct lu_fid *tfid = &mdd_env_info(env)->mti_fid2;
+
+ *tfid = *pfid;
+ tfid->f_ver = ~0;
+ linkea_add_buf(ldata, lname, tfid);
+ }
+
+ return linkea_add_buf(ldata, lname, pfid);
+}
+
+static int __mdd_links_del(const struct lu_env *env,
+ struct mdd_object *mdd_obj,
+ struct linkea_data *ldata,
+ const struct lu_name *lname,
+ const struct lu_fid *pfid)
+{
+ int rc;
+
+ if (ldata->ld_leh == NULL) {
+ rc = mdd_links_read(env, mdd_obj, ldata);
+ if (rc)
+ return rc;
+ }
+
+ rc = linkea_links_find(ldata, lname, pfid);
+ if (rc)
+ return rc;
+
+ linkea_del_buf(ldata, lname);
+ return 0;
+}
+
+static int mdd_linkea_prepare(const struct lu_env *env,
+ struct mdd_object *mdd_obj,
+ const struct lu_fid *oldpfid,
+ const struct lu_name *oldlname,
+ const struct lu_fid *newpfid,
+ const struct lu_name *newlname,
+ int first, int check,
+ struct linkea_data *ldata)
+{
+ int rc = 0;
+ int rc2 = 0;
+ ENTRY;
+
+ if (OBD_FAIL_CHECK(OBD_FAIL_FID_IGIF))
+ return 0;
+
+ LASSERT(oldpfid != NULL || newpfid != NULL);
+
+ if (mdd_obj->mod_flags & DEAD_OBJ)
+ /* No more links, don't bother */
+ RETURN(0);
+
+ if (oldpfid != NULL) {
+ rc = __mdd_links_del(env, mdd_obj, ldata, oldlname, oldpfid);
+ if (rc) {
+ if ((check == 0) ||
+ (rc != -ENODATA && rc != -ENOENT))
+ RETURN(rc);
+ /* No changes done. */
+ rc = 0;
+ }
+ }
+
+ /* If renaming, add the new record */
+ if (newpfid != NULL) {
+ /* even if the add fails, we still delete the out-of-date
+ * old link */
+ rc2 = __mdd_links_add(env, mdd_obj, ldata, newlname, newpfid,
+ first, check);
+ if (rc2 == -EEXIST)
+ rc2 = 0;
+ }
+
+ rc = rc != 0 ? rc : rc2;
+
+ RETURN(rc);
+}
+
+int mdd_links_rename(const struct lu_env *env,
+ struct mdd_object *mdd_obj,
+ const struct lu_fid *oldpfid,
+ const struct lu_name *oldlname,
+ const struct lu_fid *newpfid,
+ const struct lu_name *newlname,
+ struct thandle *handle,
+ struct linkea_data *ldata,
+ int first, int check)
+{
+ int rc2 = 0;
+ int rc = 0;
+ ENTRY;
+
+ if (ldata == NULL) {
+ ldata = &mdd_env_info(env)->mti_link_data;
+ memset(ldata, 0, sizeof(*ldata));
+ rc = mdd_linkea_prepare(env, mdd_obj, oldpfid, oldlname,
+ newpfid, newlname, first, check,
+ ldata);
+ if (rc != 0)
+ GOTO(out, rc);
+ }
+
+ if (ldata->ld_lee != NULL)
+ rc = mdd_links_write(env, mdd_obj, ldata, handle);
+ EXIT;
+out:
+ if (rc == 0)
+ rc = rc2;
+ if (rc) {
+ int error = 1;
+ if (rc == -EOVERFLOW || rc == -ENOENT)
+ error = 0;
+ if (oldpfid == NULL)
+ CDEBUG(error ? D_ERROR : D_OTHER,
+ "link_ea add '%.*s' failed %d "DFID"\n",
+ newlname->ln_namelen, newlname->ln_name,
+ rc, PFID(mdd_object_fid(mdd_obj)));
+ else if (newpfid == NULL)
+ CDEBUG(error ? D_ERROR : D_OTHER,
+ "link_ea del '%.*s' failed %d "DFID"\n",
+ oldlname->ln_namelen, oldlname->ln_name,
+ rc, PFID(mdd_object_fid(mdd_obj)));
+ else
+ CDEBUG(error ? D_ERROR : D_OTHER,
+ "link_ea rename '%.*s'->'%.*s' failed %d "
+ DFID"\n",
+ oldlname->ln_namelen, oldlname->ln_name,
+ newlname->ln_namelen, newlname->ln_name,
+ rc, PFID(mdd_object_fid(mdd_obj)));
+ }
+
+ if (ldata->ld_buf && ldata->ld_buf->lb_len > OBD_ALLOC_BIG)
+ /* if we vmalloced a large buffer drop it */
+ lu_buf_free(ldata->ld_buf);
+
+ return rc;
+}
+
+static inline int mdd_links_add(const struct lu_env *env,
+ struct mdd_object *mdd_obj,
+ const struct lu_fid *pfid,
+ const struct lu_name *lname,
+ struct thandle *handle,
+ struct linkea_data *data, int first)
+{
+ return mdd_links_rename(env, mdd_obj, NULL, NULL,
+ pfid, lname, handle, data, first, 0);
+}
+
+static inline int mdd_links_del(const struct lu_env *env,
+ struct mdd_object *mdd_obj,
+ const struct lu_fid *pfid,
+ const struct lu_name *lname,
+ struct thandle *handle)
+{
+ return mdd_links_rename(env, mdd_obj, pfid, lname,
+ NULL, NULL, handle, NULL, 0, 0);
+}
+
+/** Read the link EA into a temp buffer.
+ * Uses the mdd_thread_info::mti_big_buf since it is generally large.
+ * A pointer to the buffer is stored in \a ldata::ld_buf.
+ *
+ * \retval 0 or error
+ */
+int mdd_links_read(const struct lu_env *env, struct mdd_object *mdd_obj,
+ struct linkea_data *ldata)
+{
+ int rc;
+
+ /* First try a small buf */
+ LASSERT(env != NULL);
+ ldata->ld_buf = lu_buf_check_and_alloc(&mdd_env_info(env)->mti_link_buf,
+ CFS_PAGE_SIZE);
+ if (ldata->ld_buf->lb_buf == NULL)
+ return -ENOMEM;
+
+ if (!mdd_object_exists(mdd_obj))
+ return -ENODATA;
+
+ rc = mdo_xattr_get(env, mdd_obj, ldata->ld_buf, XATTR_NAME_LINK,
+ BYPASS_CAPA);
+ if (rc == -ERANGE) {
+ /* Buf was too small, figure out what we need. */
+ lu_buf_free(ldata->ld_buf);
+ rc = mdo_xattr_get(env, mdd_obj, ldata->ld_buf,
+ XATTR_NAME_LINK, BYPASS_CAPA);
+ if (rc < 0)
+ return rc;
+ ldata->ld_buf = lu_buf_check_and_alloc(ldata->ld_buf, rc);
+ if (ldata->ld_buf->lb_buf == NULL)
+ return -ENOMEM;
+ rc = mdo_xattr_get(env, mdd_obj, ldata->ld_buf,
+ XATTR_NAME_LINK, BYPASS_CAPA);
+ }
+ if (rc < 0)
+ return rc;
+
+ linkea_init(ldata);
+ return 0;
+}
+
+/** Read the link EA into a temp buffer.
+ * Uses the name_buf since it is generally large.
+ * \retval IS_ERR err
+ * \retval ptr to \a lu_buf (always \a mti_big_buf)
+ */
+struct lu_buf *mdd_links_get(const struct lu_env *env,
+ struct mdd_object *mdd_obj)
+{
+ struct linkea_data ldata = { 0 };
+ int rc;
+
+ rc = mdd_links_read(env, mdd_obj, &ldata);
+ return rc ? ERR_PTR(rc) : ldata.ld_buf;
+}
+
+int mdd_links_write(const struct lu_env *env, struct mdd_object *mdd_obj,
+ struct linkea_data *ldata, struct thandle *handle)
+{
+ const struct lu_buf *buf = mdd_buf_get_const(env, ldata->ld_buf->lb_buf,
+ ldata->ld_leh->leh_len);
+ return mdo_xattr_set(env, mdd_obj, buf, XATTR_NAME_LINK, 0, handle,
+ mdd_object_capa(env, mdd_obj));
+}
+
+int mdd_declare_links_add(const struct lu_env *env, struct mdd_object *mdd_obj,
+ struct thandle *handle, struct linkea_data *ldata)
+{
+ int rc;
+ int ea_len;
+ void *linkea;
+
+ if (ldata != NULL && ldata->ld_lee != NULL) {
+ ea_len = ldata->ld_leh->leh_len;
+ linkea = ldata->ld_buf->lb_buf;
+ } else {
+ ea_len = 4096;
+ linkea = NULL;
+ }
+
+ /* XXX: max size? */
+ rc = mdo_declare_xattr_set(env, mdd_obj,
+ mdd_buf_get_const(env, linkea, ea_len),
+ XATTR_NAME_LINK, 0, handle);
+ return rc;
+}
+
+static inline int mdd_declare_links_del(const struct lu_env *env,
+ struct mdd_object *c,
+ struct thandle *handle)
+{
+ int rc = 0;
+
+ /* For directory, the linkEA will be removed together
+ * with the object. */
+ if (!S_ISDIR(mdd_object_type(c)))
+ rc = mdd_declare_links_add(env, c, handle, NULL);
+
+ return rc;
+}
+
static int mdd_declare_link(const struct lu_env *env,
struct mdd_device *mdd,
struct mdd_object *p,
struct mdd_object *c,
const struct lu_name *name,
- struct thandle *handle)
+ struct thandle *handle,
+ struct linkea_data *data)
{
int rc;
if (rc)
return rc;
- rc = mdd_declare_links_add(env, c, handle);
+ rc = mdd_declare_links_add(env, c, handle, data);
if (rc)
return rc;
struct mdd_device *mdd = mdo2mdd(src_obj);
struct dynlock_handle *dlh;
struct thandle *handle;
+ struct linkea_data *ldata = &mdd_env_info(env)->mti_link_data;
int rc;
ENTRY;
if (IS_ERR(handle))
GOTO(out_pending, rc = PTR_ERR(handle));
- rc = mdd_declare_link(env, mdd, mdd_tobj, mdd_sobj, lname, handle);
+ memset(ldata, 0, sizeof(*ldata));
+
+ rc = mdd_declare_link(env, mdd, mdd_tobj, mdd_sobj, lname, handle,
+ ldata);
if (rc)
GOTO(stop, rc);
la->la_valid = LA_CTIME;
rc = mdd_attr_check_set_internal(env, mdd_sobj, la, handle, 0);
- if (rc == 0) {
- mdd_links_add(env, mdd_sobj,
- mdo2fid(mdd_tobj), lname, handle, 0);
- }
-
+ if (rc == 0) {
+ rc = mdd_linkea_prepare(env, mdd_sobj, NULL, NULL,
+ mdo2fid(mdd_tobj), lname, 0, 0,
+ ldata);
+ if (rc == 0)
+ mdd_links_add(env, mdd_sobj, mdo2fid(mdd_tobj),
+ lname, handle, ldata, 0);
+ /* The failure of links_add should not cause the link
+ * failure, reset rc here */
+ rc = 0;
+ }
EXIT;
out_unlock:
mdd_write_unlock(env, mdd_sobj);
rc = mdd_changelog_ns_store(env, mdd, CL_HARDLINK, 0, mdd_sobj,
mdd_tobj, lname, handle);
stop:
- mdd_trans_stop(env, mdd, rc, handle);
+ mdd_trans_stop(env, mdd, rc, handle);
+
+ if (ldata->ld_buf && ldata->ld_buf->lb_len > OBD_ALLOC_BIG)
+ /* if we vmalloced a large buffer drop it */
+ lu_buf_free(ldata->ld_buf);
out_pending:
return rc;
}
RETURN(rc);
}
-static inline int mdd_declare_links_del(const struct lu_env *env,
- struct mdd_object *c,
- struct thandle *handle)
-{
- int rc = 0;
-
- /* For directory, the linkEA will be removed together with the object. */
- if (!S_ISDIR(mdd_object_type(c)))
- rc = mdd_declare_links_add(env, c, handle);
-
- return rc;
-}
-
static int mdd_declare_unlink(const struct lu_env *env, struct mdd_device *mdd,
struct mdd_object *p, struct mdd_object *c,
const struct lu_name *name, struct md_attr *ma,
struct mdd_object *parent,
struct mdd_object *child,
struct lu_attr *attr,
- struct thandle *handle)
+ struct thandle *handle,
+ struct linkea_data *ldata)
{
int rc;
ENTRY;
if (rc == 0 && (fid_is_norm(mdo2fid(child)) ||
fid_is_dot_lustre(mdo2fid(child)) ||
fid_is_root(mdo2fid(child))))
- mdd_declare_links_add(env, child, handle);
+ mdd_declare_links_add(env, child, handle, ldata);
RETURN(rc);
}
-int mdd_object_initialize(const struct lu_env *env, const struct lu_fid *pfid,
- const struct lu_name *lname, struct mdd_object *child,
- const struct lu_attr *attr, struct thandle *handle,
- const struct md_op_spec *spec)
+static int mdd_object_initialize(const struct lu_env *env,
+ const struct lu_fid *pfid,
+ const struct lu_name *lname,
+ struct mdd_object *child,
+ struct lu_attr *attr, struct thandle *handle,
+ const struct md_op_spec *spec,
+ struct linkea_data *ldata)
{
int rc;
ENTRY;
if (rc == 0 && (fid_is_norm(mdo2fid(child)) ||
fid_is_dot_lustre(mdo2fid(child)) ||
fid_is_root(mdo2fid(child))))
- mdd_links_add(env, child, pfid, lname, handle, 1);
+ mdd_links_add(env, child, pfid, lname, handle, ldata, 1);
RETURN(rc);
}
struct lu_attr *attr,
int got_def_acl,
struct thandle *handle,
- const struct md_op_spec *spec)
+ const struct md_op_spec *spec,
+ struct linkea_data *ldata)
{
int rc;
GOTO(out, rc);
}
- rc = mdd_declare_object_initialize(env, p, c, attr, handle);
+ rc = mdd_declare_object_initialize(env, p, c, attr, handle, ldata);
if (rc)
GOTO(out, rc);
struct thandle *handle;
struct lu_attr *pattr = &info->mti_pattr;
struct lu_buf acl_buf;
+ struct linkea_data *ldata = &info->mti_link_data;
struct dynlock_handle *dlh;
const char *name = lname->ln_name;
int rc, created = 0, initialized = 0, inserted = 0;
if (IS_ERR(handle))
GOTO(out_free, rc = PTR_ERR(handle));
+ memset(ldata, 0, sizeof(*ldata));
+ mdd_linkea_prepare(env, son, NULL, NULL, mdd_object_fid(mdd_pobj),
+ lname, 1, 0, ldata);
rc = mdd_declare_create(env, mdd, mdd_pobj, son, lname, attr,
- got_def_acl, handle, spec);
+ got_def_acl, handle, spec, ldata);
if (rc)
GOTO(out_stop, rc);
#endif
rc = mdd_object_initialize(env, mdo2fid(mdd_pobj), lname,
- son, attr, handle, spec);
+ son, attr, handle, spec, ldata);
/*
* in case of replay we just set LOVEA provided by the client
out_stop:
mdd_trans_stop(env, mdd, rc, handle);
out_free:
+ if (ldata->ld_buf && ldata->ld_buf->lb_len > OBD_ALLOC_BIG)
+ /* if we vmalloced a large buffer drop it */
+ lu_buf_free(ldata->ld_buf);
+
/* The child object shouldn't be cached anymore */
if (rc)
set_bit(LU_OBJECT_HEARD_BANSHEE,
struct lu_attr *so_attr,
struct lu_attr *tg_attr)
{
- int rc = 0;
- ENTRY;
+ int rc = 0;
+ ENTRY;
- /* XXX: when get here, sobj must NOT be NULL,
- * the other case has been processed in cml_rename
- * before mdd_rename and enable MDS_PERM_BYPASS. */
- LASSERT(sobj);
+ /* XXX: when get here, sobj must NOT be NULL,
+ * the other case has been processed in cld_rename
+ * before mdd_rename and enable MDS_PERM_BYPASS. */
+ LASSERT(sobj);
rc = mdd_may_delete(env, src_pobj, sobj, so_attr, NULL, 1, 0);
- if (rc)
- RETURN(rc);
+ if (rc)
+ RETURN(rc);
- /* XXX: when get here, "tobj == NULL" means tobj must
- * NOT exist (neither on remote MDS, such case has been
- * processed in cml_rename before mdd_rename and enable
- * MDS_PERM_BYPASS).
- * So check may_create, but not check may_unlink. */
- if (!tobj)
- rc = mdd_may_create(env, tgt_pobj, NULL,
- (src_pobj != tgt_pobj), 0);
- else
+ /* XXX: when get here, "tobj == NULL" means tobj must
+ * NOT exist (neither on remote MDS, such case has been
+ * processed in cld_rename before mdd_rename and enable
+ * MDS_PERM_BYPASS).
+ * So check may_create, but not check may_unlink. */
+ if (!tobj)
+ rc = mdd_may_create(env, tgt_pobj, NULL,
+ (src_pobj != tgt_pobj), 0);
+ else
rc = mdd_may_delete(env, tgt_pobj, tobj, tg_attr, so_attr,
- (src_pobj != tgt_pobj), 1);
+ (src_pobj != tgt_pobj), 1);
- if (!rc && !tobj && (src_pobj != tgt_pobj) &&
+ if (!rc && !tobj && (src_pobj != tgt_pobj) &&
S_ISDIR(so_attr->la_mode))
- rc = __mdd_may_link(env, tgt_pobj);
+ rc = __mdd_may_link(env, tgt_pobj);
- RETURN(rc);
+ RETURN(rc);
}
static int mdd_declare_rename(const struct lu_env *env,
rc = mdo_declare_attr_set(env, mdd_sobj, NULL, handle);
if (rc)
return rc;
- mdd_declare_links_add(env, mdd_sobj, handle);
+ mdd_declare_links_add(env, mdd_sobj, handle, NULL);
if (rc)
return rc;
if (rc)
return rc;
- mdd_declare_links_add(env, mdd_tobj, handle);
+ mdd_declare_links_del(env, mdd_tobj, handle);
if (rc)
return rc;
if (rc == 0 && mdd_sobj) {
mdd_write_lock(env, mdd_sobj, MOR_SRC_CHILD);
rc = mdd_links_rename(env, mdd_sobj, mdo2fid(mdd_spobj), lsname,
- mdo2fid(mdd_tpobj), ltname, handle, 0, 0);
+ mdo2fid(mdd_tpobj), ltname, handle, NULL,
+ 0, 0);
if (rc == -ENOENT)
/* Old files might not have EA entry */
mdd_links_add(env, mdd_sobj, mdo2fid(mdd_spobj),
- lsname, handle, 0);
+ lsname, handle, NULL, 0);
mdd_write_unlock(env, mdd_sobj);
/* We don't fail the transaction if the link ea can't be
updated -- fid2path will use alternate lookup method. */
return rc;
}
-int mdd_links_new(const struct lu_env *env, struct mdd_link_data *ldata)
-{
- ldata->ml_buf = mdd_buf_alloc(env, CFS_PAGE_SIZE);
- if (ldata->ml_buf->lb_buf == NULL)
- return -ENOMEM;
- ldata->ml_leh = ldata->ml_buf->lb_buf;
- ldata->ml_leh->leh_magic = LINK_EA_MAGIC;
- ldata->ml_leh->leh_len = sizeof(struct link_ea_header);
- ldata->ml_leh->leh_reccount = 0;
- return 0;
-}
-
-/** Read the link EA into a temp buffer.
- * Uses the mdd_thread_info::mti_big_buf since it is generally large.
- * A pointer to the buffer is stored in \a ldata::ml_buf.
- *
- * \retval 0 or error
- */
-int mdd_links_read(const struct lu_env *env, struct mdd_object *mdd_obj,
- struct mdd_link_data *ldata)
-{
- struct lustre_capa *capa;
- struct link_ea_header *leh;
- int rc;
-
- /* First try a small buf */
- LASSERT(env != NULL);
- ldata->ml_buf = mdd_buf_alloc(env, CFS_PAGE_SIZE);
- if (ldata->ml_buf->lb_buf == NULL)
- return -ENOMEM;
-
- if (!mdd_object_exists(mdd_obj))
- return -ENODATA;
-
- capa = mdd_object_capa(env, mdd_obj);
- rc = mdo_xattr_get(env, mdd_obj, ldata->ml_buf,
- XATTR_NAME_LINK, capa);
- if (rc == -ERANGE) {
- /* Buf was too small, figure out what we need. */
- mdd_buf_put(ldata->ml_buf);
- rc = mdo_xattr_get(env, mdd_obj, ldata->ml_buf,
- XATTR_NAME_LINK, capa);
- if (rc < 0)
- return rc;
- ldata->ml_buf = mdd_buf_alloc(env, rc);
- if (ldata->ml_buf->lb_buf == NULL)
- return -ENOMEM;
- rc = mdo_xattr_get(env, mdd_obj, &LU_BUF_NULL,
- XATTR_NAME_LINK, capa);
- }
- if (rc < 0)
- return rc;
-
- leh = ldata->ml_buf->lb_buf;
- if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
- leh->leh_magic = LINK_EA_MAGIC;
- leh->leh_reccount = __swab32(leh->leh_reccount);
- leh->leh_len = __swab64(leh->leh_len);
- /* entries are swabbed by mdd_lee_unpack */
- }
- if (leh->leh_magic != LINK_EA_MAGIC)
- return -EINVAL;
- if (leh->leh_reccount == 0)
- return -ENODATA;
-
- ldata->ml_leh = leh;
- return 0;
-}
-
-/** Read the link EA into a temp buffer.
- * Uses the name_buf since it is generally large.
- * \retval IS_ERR err
- * \retval ptr to \a lu_buf (always \a mti_big_buf)
- */
-struct lu_buf *mdd_links_get(const struct lu_env *env,
- struct mdd_object *mdd_obj)
-{
- struct mdd_link_data ldata = { 0 };
- int rc;
-
- rc = mdd_links_read(env, mdd_obj, &ldata);
- return rc ? ERR_PTR(rc) : ldata.ml_buf;
-}
-
-int mdd_links_write(const struct lu_env *env, struct mdd_object *mdd_obj,
- struct mdd_link_data *ldata, struct thandle *handle)
-{
- const struct lu_buf *buf = mdd_buf_get_const(env, ldata->ml_buf->lb_buf,
- ldata->ml_leh->leh_len);
- return mdo_xattr_set(env, mdd_obj, buf, XATTR_NAME_LINK, 0, handle,
- mdd_object_capa(env, mdd_obj));
-}
-
-/** Pack a link_ea_entry.
- * All elements are stored as chars to avoid alignment issues.
- * Numbers are always big-endian
- * \retval record length
- */
-static int mdd_lee_pack(struct link_ea_entry *lee, const struct lu_name *lname,
- const struct lu_fid *pfid)
-{
- struct lu_fid tmpfid;
- int reclen;
-
- fid_cpu_to_be(&tmpfid, pfid);
- if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LINKEA_CRASH))
- tmpfid.f_ver = ~0;
- memcpy(&lee->lee_parent_fid, &tmpfid, sizeof(tmpfid));
- memcpy(lee->lee_name, lname->ln_name, lname->ln_namelen);
- reclen = sizeof(struct link_ea_entry) + lname->ln_namelen;
-
- lee->lee_reclen[0] = (reclen >> 8) & 0xff;
- lee->lee_reclen[1] = reclen & 0xff;
- return reclen;
-}
-
-void mdd_lee_unpack(const struct link_ea_entry *lee, int *reclen,
- struct lu_name *lname, struct lu_fid *pfid)
-{
- *reclen = (lee->lee_reclen[0] << 8) | lee->lee_reclen[1];
- memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
- fid_be_to_cpu(pfid, pfid);
- lname->ln_name = lee->lee_name;
- lname->ln_namelen = *reclen - sizeof(struct link_ea_entry);
-}
-
-int mdd_declare_links_add(const struct lu_env *env,
- struct mdd_object *mdd_obj,
- struct thandle *handle)
-{
- int rc;
-
- /* XXX: max size? */
- rc = mdo_declare_xattr_set(env, mdd_obj,
- mdd_buf_get_const(env, NULL, 4096),
- XATTR_NAME_LINK, 0, handle);
-
- return rc;
-}
-
-/** Add a record to the end of link ea buf */
-int mdd_links_add_buf(const struct lu_env *env, struct mdd_link_data *ldata,
- const struct lu_name *lname, const struct lu_fid *pfid)
-{
- LASSERT(ldata->ml_leh != NULL);
-
- if (lname == NULL || pfid == NULL)
- return -EINVAL;
-
- ldata->ml_reclen = lname->ln_namelen + sizeof(struct link_ea_entry);
- if (ldata->ml_leh->leh_len + ldata->ml_reclen >
- ldata->ml_buf->lb_len) {
- if (mdd_buf_grow(env, ldata->ml_leh->leh_len +
- ldata->ml_reclen) < 0)
- return -ENOMEM;
- }
-
- ldata->ml_leh = ldata->ml_buf->lb_buf;
- ldata->ml_lee = ldata->ml_buf->lb_buf + ldata->ml_leh->leh_len;
- ldata->ml_reclen = mdd_lee_pack(ldata->ml_lee, lname, pfid);
- ldata->ml_leh->leh_len += ldata->ml_reclen;
- ldata->ml_leh->leh_reccount++;
- CDEBUG(D_INODE, "New link_ea name '%.*s' is added\n",
- lname->ln_namelen, lname->ln_name);
- return 0;
-}
-
-/** Del the current record from the link ea buf */
-void mdd_links_del_buf(const struct lu_env *env, struct mdd_link_data *ldata,
- const struct lu_name *lname)
-{
- LASSERT(ldata->ml_leh != NULL);
-
- ldata->ml_leh->leh_reccount--;
- ldata->ml_leh->leh_len -= ldata->ml_reclen;
- memmove(ldata->ml_lee, (char *)ldata->ml_lee + ldata->ml_reclen,
- (char *)ldata->ml_leh + ldata->ml_leh->leh_len -
- (char *)ldata->ml_lee);
- CDEBUG(D_INODE, "Old link_ea name '%.*s' is removed\n",
- lname->ln_namelen, lname->ln_name);
-
-}
-
-/**
- * Check if such a link exists in linkEA.
- *
- * \param mdd_obj object being handled
- * \param pfid parent fid the link to be found for
- * \param lname name in the parent's directory entry pointing to this object
- * \param ldata link data the search to be done on
- *
- * \retval 0 success
- * \retval -ENOENT link does not exist
- * \retval -ve on error
- */
-int mdd_links_find(const struct lu_env *env, struct mdd_object *mdd_obj,
- struct mdd_link_data *ldata, const struct lu_name *lname,
- const struct lu_fid *pfid)
-{
- struct lu_name *tmpname = &mdd_env_info(env)->mti_name2;
- struct lu_fid *tmpfid = &mdd_env_info(env)->mti_fid;
- int count;
-
- LASSERT(ldata->ml_leh != NULL);
-
- /* link #0 */
- ldata->ml_lee = (struct link_ea_entry *)(ldata->ml_leh + 1);
-
- for (count = 0; count < ldata->ml_leh->leh_reccount; count++) {
- mdd_lee_unpack(ldata->ml_lee, &ldata->ml_reclen,
- tmpname, tmpfid);
- if (tmpname->ln_namelen == lname->ln_namelen &&
- lu_fid_eq(tmpfid, pfid) &&
- (strncmp(tmpname->ln_name, lname->ln_name,
- tmpname->ln_namelen) == 0))
- break;
- ldata->ml_lee = (struct link_ea_entry *)((char *)ldata->ml_lee +
- ldata->ml_reclen);
- }
-
- if (count == ldata->ml_leh->leh_reccount) {
- CDEBUG(D_INODE, "Old link_ea name '%.*s' not found\n",
- lname->ln_namelen, lname->ln_name);
- return -ENOENT;
- }
- return 0;
-}
-
-static int __mdd_links_add(const struct lu_env *env,
- struct mdd_object *mdd_obj,
- struct mdd_link_data *ldata,
- const struct lu_name *lname,
- const struct lu_fid *pfid,
- int first, int check)
-{
- int rc;
-
- if (ldata->ml_leh == NULL) {
- rc = first ? -ENODATA : mdd_links_read(env, mdd_obj, ldata);
- if (rc) {
- if (rc != -ENODATA)
- return rc;
- rc = mdd_links_new(env, ldata);
- if (rc)
- return rc;
- }
- }
-
- if (check) {
- rc = mdd_links_find(env, mdd_obj, ldata, lname, pfid);
- if (rc && rc != -ENOENT)
- return rc;
- if (rc == 0)
- return -EEXIST;
- }
-
- if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LINKEA_MORE)) {
- struct lu_fid *tfid = &mdd_env_info(env)->mti_fid2;
-
- *tfid = *pfid;
- tfid->f_ver = ~0;
- mdd_links_add_buf(env, ldata, lname, tfid);
- }
-
- return mdd_links_add_buf(env, ldata, lname, pfid);
-}
-
-static int __mdd_links_del(const struct lu_env *env,
- struct mdd_object *mdd_obj,
- struct mdd_link_data *ldata,
- const struct lu_name *lname,
- const struct lu_fid *pfid)
-{
- int rc;
-
- if (ldata->ml_leh == NULL) {
- rc = mdd_links_read(env, mdd_obj, ldata);
- if (rc)
- return rc;
- }
-
- rc = mdd_links_find(env, mdd_obj, ldata, lname, pfid);
- if (rc)
- return rc;
-
- mdd_links_del_buf(env, ldata, lname);
- return 0;
-}
-
-int mdd_links_rename(const struct lu_env *env,
- struct mdd_object *mdd_obj,
- const struct lu_fid *oldpfid,
- const struct lu_name *oldlname,
- const struct lu_fid *newpfid,
- const struct lu_name *newlname,
- struct thandle *handle,
- int first, int check)
-{
- struct mdd_link_data ldata = { 0 };
- int updated = 0;
- int rc2 = 0;
- int rc = 0;
- ENTRY;
-
- if (OBD_FAIL_CHECK(OBD_FAIL_FID_IGIF))
- return 0;
-
- LASSERT(oldpfid != NULL || newpfid != NULL);
-
- if (mdd_obj->mod_flags & DEAD_OBJ)
- /* No more links, don't bother */
- RETURN(0);
-
- if (oldpfid != NULL) {
- rc = __mdd_links_del(env, mdd_obj, &ldata,
- oldlname, oldpfid);
- if (rc) {
- if ((check == 0) ||
- (rc != -ENODATA && rc != -ENOENT))
- GOTO(out, rc);
- /* No changes done. */
- rc = 0;
- } else {
- updated = 1;
- }
- }
-
- /* If renaming, add the new record */
- if (newpfid != NULL) {
- /* even if the add fails, we still delete the out-of-date
- * old link */
- rc2 = __mdd_links_add(env, mdd_obj, &ldata,
- newlname, newpfid, first, check);
- if (rc2 == -EEXIST)
- rc2 = 0;
- else if (rc2 == 0)
- updated = 1;
- }
-
- if (updated)
- rc = mdd_links_write(env, mdd_obj, &ldata, handle);
- EXIT;
-out:
- if (rc == 0)
- rc = rc2;
- if (rc) {
- int error = 1;
- if (rc == -EOVERFLOW || rc == - ENOENT)
- error = 0;
- if (oldpfid == NULL)
- CDEBUG(error ? D_ERROR : D_OTHER,
- "link_ea add '%.*s' failed %d "DFID"\n",
- newlname->ln_namelen, newlname->ln_name,
- rc, PFID(mdd_object_fid(mdd_obj)));
- else if (newpfid == NULL)
- CDEBUG(error ? D_ERROR : D_OTHER,
- "link_ea del '%.*s' failed %d "DFID"\n",
- oldlname->ln_namelen, oldlname->ln_name,
- rc, PFID(mdd_object_fid(mdd_obj)));
- else
- CDEBUG(error ? D_ERROR : D_OTHER,
- "link_ea rename '%.*s'->'%.*s' failed %d "
- DFID"\n",
- oldlname->ln_namelen, oldlname->ln_name,
- newlname->ln_namelen, newlname->ln_name,
- rc, PFID(mdd_object_fid(mdd_obj)));
- }
-
- if (ldata.ml_buf && ldata.ml_buf->lb_len > OBD_ALLOC_BIG)
- /* if we vmalloced a large buffer drop it */
- mdd_buf_put(ldata.ml_buf);
-
- return rc;
-}
-
-static inline int mdd_links_add(const struct lu_env *env,
- struct mdd_object *mdd_obj,
- const struct lu_fid *pfid,
- const struct lu_name *lname,
- struct thandle *handle, int first)
-{
- return mdd_links_rename(env, mdd_obj, NULL, NULL,
- pfid, lname, handle, first, 0);
-}
-
-static inline int mdd_links_del(const struct lu_env *env,
- struct mdd_object *mdd_obj,
- const struct lu_fid *pfid,
- const struct lu_name *lname,
- struct thandle *handle)
-{
- return mdd_links_rename(env, mdd_obj, pfid, lname,
- NULL, NULL, handle, 0, 0);
-}
-
const struct md_dir_operations mdd_dir_ops = {
.mdo_is_subdir = mdd_is_subdir,
.mdo_lookup = mdd_lookup,
git://git.whamcloud.com / fs / lustre-release.git / blobdiff