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-rw-r--r--fs/ceph/snap.c1320
1 files changed, 1320 insertions, 0 deletions
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
new file mode 100644
index 000000000..82f7592e1
--- /dev/null
+++ b/fs/ceph/snap.c
@@ -0,0 +1,1320 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/ceph/ceph_debug.h>
+
+#include <linux/fs.h>
+#include <linux/sort.h>
+#include <linux/slab.h>
+#include <linux/iversion.h>
+#include "super.h"
+#include "mds_client.h"
+#include <linux/ceph/decode.h>
+
+/* unused map expires after 5 minutes */
+#define CEPH_SNAPID_MAP_TIMEOUT (5 * 60 * HZ)
+
+/*
+ * Snapshots in ceph are driven in large part by cooperation from the
+ * client. In contrast to local file systems or file servers that
+ * implement snapshots at a single point in the system, ceph's
+ * distributed access to storage requires clients to help decide
+ * whether a write logically occurs before or after a recently created
+ * snapshot.
+ *
+ * This provides a perfect instantanous client-wide snapshot. Between
+ * clients, however, snapshots may appear to be applied at slightly
+ * different points in time, depending on delays in delivering the
+ * snapshot notification.
+ *
+ * Snapshots are _not_ file system-wide. Instead, each snapshot
+ * applies to the subdirectory nested beneath some directory. This
+ * effectively divides the hierarchy into multiple "realms," where all
+ * of the files contained by each realm share the same set of
+ * snapshots. An individual realm's snap set contains snapshots
+ * explicitly created on that realm, as well as any snaps in its
+ * parent's snap set _after_ the point at which the parent became it's
+ * parent (due to, say, a rename). Similarly, snaps from prior parents
+ * during the time intervals during which they were the parent are included.
+ *
+ * The client is spared most of this detail, fortunately... it must only
+ * maintains a hierarchy of realms reflecting the current parent/child
+ * realm relationship, and for each realm has an explicit list of snaps
+ * inherited from prior parents.
+ *
+ * A snap_realm struct is maintained for realms containing every inode
+ * with an open cap in the system. (The needed snap realm information is
+ * provided by the MDS whenever a cap is issued, i.e., on open.) A 'seq'
+ * version number is used to ensure that as realm parameters change (new
+ * snapshot, new parent, etc.) the client's realm hierarchy is updated.
+ *
+ * The realm hierarchy drives the generation of a 'snap context' for each
+ * realm, which simply lists the resulting set of snaps for the realm. This
+ * is attached to any writes sent to OSDs.
+ */
+/*
+ * Unfortunately error handling is a bit mixed here. If we get a snap
+ * update, but don't have enough memory to update our realm hierarchy,
+ * it's not clear what we can do about it (besides complaining to the
+ * console).
+ */
+
+
+/*
+ * increase ref count for the realm
+ *
+ * caller must hold snap_rwsem.
+ */
+void ceph_get_snap_realm(struct ceph_mds_client *mdsc,
+ struct ceph_snap_realm *realm)
+{
+ lockdep_assert_held(&mdsc->snap_rwsem);
+
+ /*
+ * The 0->1 and 1->0 transitions must take the snap_empty_lock
+ * atomically with the refcount change. Go ahead and bump the
+ * nref here, unless it's 0, in which case we take the spinlock
+ * and then do the increment and remove it from the list.
+ */
+ if (atomic_inc_not_zero(&realm->nref))
+ return;
+
+ spin_lock(&mdsc->snap_empty_lock);
+ if (atomic_inc_return(&realm->nref) == 1)
+ list_del_init(&realm->empty_item);
+ spin_unlock(&mdsc->snap_empty_lock);
+}
+
+static void __insert_snap_realm(struct rb_root *root,
+ struct ceph_snap_realm *new)
+{
+ struct rb_node **p = &root->rb_node;
+ struct rb_node *parent = NULL;
+ struct ceph_snap_realm *r = NULL;
+
+ while (*p) {
+ parent = *p;
+ r = rb_entry(parent, struct ceph_snap_realm, node);
+ if (new->ino < r->ino)
+ p = &(*p)->rb_left;
+ else if (new->ino > r->ino)
+ p = &(*p)->rb_right;
+ else
+ BUG();
+ }
+
+ rb_link_node(&new->node, parent, p);
+ rb_insert_color(&new->node, root);
+}
+
+/*
+ * create and get the realm rooted at @ino and bump its ref count.
+ *
+ * caller must hold snap_rwsem for write.
+ */
+static struct ceph_snap_realm *ceph_create_snap_realm(
+ struct ceph_mds_client *mdsc,
+ u64 ino)
+{
+ struct ceph_snap_realm *realm;
+
+ lockdep_assert_held_write(&mdsc->snap_rwsem);
+
+ realm = kzalloc(sizeof(*realm), GFP_NOFS);
+ if (!realm)
+ return ERR_PTR(-ENOMEM);
+
+ /* Do not release the global dummy snaprealm until unmouting */
+ if (ino == CEPH_INO_GLOBAL_SNAPREALM)
+ atomic_set(&realm->nref, 2);
+ else
+ atomic_set(&realm->nref, 1);
+ realm->ino = ino;
+ INIT_LIST_HEAD(&realm->children);
+ INIT_LIST_HEAD(&realm->child_item);
+ INIT_LIST_HEAD(&realm->empty_item);
+ INIT_LIST_HEAD(&realm->dirty_item);
+ INIT_LIST_HEAD(&realm->rebuild_item);
+ INIT_LIST_HEAD(&realm->inodes_with_caps);
+ spin_lock_init(&realm->inodes_with_caps_lock);
+ __insert_snap_realm(&mdsc->snap_realms, realm);
+ mdsc->num_snap_realms++;
+
+ dout("%s %llx %p\n", __func__, realm->ino, realm);
+ return realm;
+}
+
+/*
+ * lookup the realm rooted at @ino.
+ *
+ * caller must hold snap_rwsem.
+ */
+static struct ceph_snap_realm *__lookup_snap_realm(struct ceph_mds_client *mdsc,
+ u64 ino)
+{
+ struct rb_node *n = mdsc->snap_realms.rb_node;
+ struct ceph_snap_realm *r;
+
+ lockdep_assert_held(&mdsc->snap_rwsem);
+
+ while (n) {
+ r = rb_entry(n, struct ceph_snap_realm, node);
+ if (ino < r->ino)
+ n = n->rb_left;
+ else if (ino > r->ino)
+ n = n->rb_right;
+ else {
+ dout("%s %llx %p\n", __func__, r->ino, r);
+ return r;
+ }
+ }
+ return NULL;
+}
+
+struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc,
+ u64 ino)
+{
+ struct ceph_snap_realm *r;
+ r = __lookup_snap_realm(mdsc, ino);
+ if (r)
+ ceph_get_snap_realm(mdsc, r);
+ return r;
+}
+
+static void __put_snap_realm(struct ceph_mds_client *mdsc,
+ struct ceph_snap_realm *realm);
+
+/*
+ * called with snap_rwsem (write)
+ */
+static void __destroy_snap_realm(struct ceph_mds_client *mdsc,
+ struct ceph_snap_realm *realm)
+{
+ lockdep_assert_held_write(&mdsc->snap_rwsem);
+
+ dout("%s %p %llx\n", __func__, realm, realm->ino);
+
+ rb_erase(&realm->node, &mdsc->snap_realms);
+ mdsc->num_snap_realms--;
+
+ if (realm->parent) {
+ list_del_init(&realm->child_item);
+ __put_snap_realm(mdsc, realm->parent);
+ }
+
+ kfree(realm->prior_parent_snaps);
+ kfree(realm->snaps);
+ ceph_put_snap_context(realm->cached_context);
+ kfree(realm);
+}
+
+/*
+ * caller holds snap_rwsem (write)
+ */
+static void __put_snap_realm(struct ceph_mds_client *mdsc,
+ struct ceph_snap_realm *realm)
+{
+ lockdep_assert_held_write(&mdsc->snap_rwsem);
+
+ /*
+ * We do not require the snap_empty_lock here, as any caller that
+ * increments the value must hold the snap_rwsem.
+ */
+ if (atomic_dec_and_test(&realm->nref))
+ __destroy_snap_realm(mdsc, realm);
+}
+
+/*
+ * See comments in ceph_get_snap_realm. Caller needn't hold any locks.
+ */
+void ceph_put_snap_realm(struct ceph_mds_client *mdsc,
+ struct ceph_snap_realm *realm)
+{
+ if (!atomic_dec_and_lock(&realm->nref, &mdsc->snap_empty_lock))
+ return;
+
+ if (down_write_trylock(&mdsc->snap_rwsem)) {
+ spin_unlock(&mdsc->snap_empty_lock);
+ __destroy_snap_realm(mdsc, realm);
+ up_write(&mdsc->snap_rwsem);
+ } else {
+ list_add(&realm->empty_item, &mdsc->snap_empty);
+ spin_unlock(&mdsc->snap_empty_lock);
+ }
+}
+
+/*
+ * Clean up any realms whose ref counts have dropped to zero. Note
+ * that this does not include realms who were created but not yet
+ * used.
+ *
+ * Called under snap_rwsem (write)
+ */
+static void __cleanup_empty_realms(struct ceph_mds_client *mdsc)
+{
+ struct ceph_snap_realm *realm;
+
+ lockdep_assert_held_write(&mdsc->snap_rwsem);
+
+ spin_lock(&mdsc->snap_empty_lock);
+ while (!list_empty(&mdsc->snap_empty)) {
+ realm = list_first_entry(&mdsc->snap_empty,
+ struct ceph_snap_realm, empty_item);
+ list_del(&realm->empty_item);
+ spin_unlock(&mdsc->snap_empty_lock);
+ __destroy_snap_realm(mdsc, realm);
+ spin_lock(&mdsc->snap_empty_lock);
+ }
+ spin_unlock(&mdsc->snap_empty_lock);
+}
+
+void ceph_cleanup_global_and_empty_realms(struct ceph_mds_client *mdsc)
+{
+ struct ceph_snap_realm *global_realm;
+
+ down_write(&mdsc->snap_rwsem);
+ global_realm = __lookup_snap_realm(mdsc, CEPH_INO_GLOBAL_SNAPREALM);
+ if (global_realm)
+ ceph_put_snap_realm(mdsc, global_realm);
+ __cleanup_empty_realms(mdsc);
+ up_write(&mdsc->snap_rwsem);
+}
+
+/*
+ * adjust the parent realm of a given @realm. adjust child list, and parent
+ * pointers, and ref counts appropriately.
+ *
+ * return true if parent was changed, 0 if unchanged, <0 on error.
+ *
+ * caller must hold snap_rwsem for write.
+ */
+static int adjust_snap_realm_parent(struct ceph_mds_client *mdsc,
+ struct ceph_snap_realm *realm,
+ u64 parentino)
+{
+ struct ceph_snap_realm *parent;
+
+ lockdep_assert_held_write(&mdsc->snap_rwsem);
+
+ if (realm->parent_ino == parentino)
+ return 0;
+
+ parent = ceph_lookup_snap_realm(mdsc, parentino);
+ if (!parent) {
+ parent = ceph_create_snap_realm(mdsc, parentino);
+ if (IS_ERR(parent))
+ return PTR_ERR(parent);
+ }
+ dout("%s %llx %p: %llx %p -> %llx %p\n", __func__, realm->ino,
+ realm, realm->parent_ino, realm->parent, parentino, parent);
+ if (realm->parent) {
+ list_del_init(&realm->child_item);
+ ceph_put_snap_realm(mdsc, realm->parent);
+ }
+ realm->parent_ino = parentino;
+ realm->parent = parent;
+ list_add(&realm->child_item, &parent->children);
+ return 1;
+}
+
+
+static int cmpu64_rev(const void *a, const void *b)
+{
+ if (*(u64 *)a < *(u64 *)b)
+ return 1;
+ if (*(u64 *)a > *(u64 *)b)
+ return -1;
+ return 0;
+}
+
+
+/*
+ * build the snap context for a given realm.
+ */
+static int build_snap_context(struct ceph_snap_realm *realm,
+ struct list_head *realm_queue,
+ struct list_head *dirty_realms)
+{
+ struct ceph_snap_realm *parent = realm->parent;
+ struct ceph_snap_context *snapc;
+ int err = 0;
+ u32 num = realm->num_prior_parent_snaps + realm->num_snaps;
+
+ /*
+ * build parent context, if it hasn't been built.
+ * conservatively estimate that all parent snaps might be
+ * included by us.
+ */
+ if (parent) {
+ if (!parent->cached_context) {
+ /* add to the queue head */
+ list_add(&parent->rebuild_item, realm_queue);
+ return 1;
+ }
+ num += parent->cached_context->num_snaps;
+ }
+
+ /* do i actually need to update? not if my context seq
+ matches realm seq, and my parents' does to. (this works
+ because we rebuild_snap_realms() works _downward_ in
+ hierarchy after each update.) */
+ if (realm->cached_context &&
+ realm->cached_context->seq == realm->seq &&
+ (!parent ||
+ realm->cached_context->seq >= parent->cached_context->seq)) {
+ dout("%s %llx %p: %p seq %lld (%u snaps) (unchanged)\n",
+ __func__, realm->ino, realm, realm->cached_context,
+ realm->cached_context->seq,
+ (unsigned int)realm->cached_context->num_snaps);
+ return 0;
+ }
+
+ /* alloc new snap context */
+ err = -ENOMEM;
+ if (num > (SIZE_MAX - sizeof(*snapc)) / sizeof(u64))
+ goto fail;
+ snapc = ceph_create_snap_context(num, GFP_NOFS);
+ if (!snapc)
+ goto fail;
+
+ /* build (reverse sorted) snap vector */
+ num = 0;
+ snapc->seq = realm->seq;
+ if (parent) {
+ u32 i;
+
+ /* include any of parent's snaps occurring _after_ my
+ parent became my parent */
+ for (i = 0; i < parent->cached_context->num_snaps; i++)
+ if (parent->cached_context->snaps[i] >=
+ realm->parent_since)
+ snapc->snaps[num++] =
+ parent->cached_context->snaps[i];
+ if (parent->cached_context->seq > snapc->seq)
+ snapc->seq = parent->cached_context->seq;
+ }
+ memcpy(snapc->snaps + num, realm->snaps,
+ sizeof(u64)*realm->num_snaps);
+ num += realm->num_snaps;
+ memcpy(snapc->snaps + num, realm->prior_parent_snaps,
+ sizeof(u64)*realm->num_prior_parent_snaps);
+ num += realm->num_prior_parent_snaps;
+
+ sort(snapc->snaps, num, sizeof(u64), cmpu64_rev, NULL);
+ snapc->num_snaps = num;
+ dout("%s %llx %p: %p seq %lld (%u snaps)\n", __func__, realm->ino,
+ realm, snapc, snapc->seq, (unsigned int) snapc->num_snaps);
+
+ ceph_put_snap_context(realm->cached_context);
+ realm->cached_context = snapc;
+ /* queue realm for cap_snap creation */
+ list_add_tail(&realm->dirty_item, dirty_realms);
+ return 0;
+
+fail:
+ /*
+ * if we fail, clear old (incorrect) cached_context... hopefully
+ * we'll have better luck building it later
+ */
+ if (realm->cached_context) {
+ ceph_put_snap_context(realm->cached_context);
+ realm->cached_context = NULL;
+ }
+ pr_err("%s %llx %p fail %d\n", __func__, realm->ino, realm, err);
+ return err;
+}
+
+/*
+ * rebuild snap context for the given realm and all of its children.
+ */
+static void rebuild_snap_realms(struct ceph_snap_realm *realm,
+ struct list_head *dirty_realms)
+{
+ LIST_HEAD(realm_queue);
+ int last = 0;
+ bool skip = false;
+
+ list_add_tail(&realm->rebuild_item, &realm_queue);
+
+ while (!list_empty(&realm_queue)) {
+ struct ceph_snap_realm *_realm, *child;
+
+ _realm = list_first_entry(&realm_queue,
+ struct ceph_snap_realm,
+ rebuild_item);
+
+ /*
+ * If the last building failed dues to memory
+ * issue, just empty the realm_queue and return
+ * to avoid infinite loop.
+ */
+ if (last < 0) {
+ list_del_init(&_realm->rebuild_item);
+ continue;
+ }
+
+ last = build_snap_context(_realm, &realm_queue, dirty_realms);
+ dout("%s %llx %p, %s\n", __func__, _realm->ino, _realm,
+ last > 0 ? "is deferred" : !last ? "succeeded" : "failed");
+
+ /* is any child in the list ? */
+ list_for_each_entry(child, &_realm->children, child_item) {
+ if (!list_empty(&child->rebuild_item)) {
+ skip = true;
+ break;
+ }
+ }
+
+ if (!skip) {
+ list_for_each_entry(child, &_realm->children, child_item)
+ list_add_tail(&child->rebuild_item, &realm_queue);
+ }
+
+ /* last == 1 means need to build parent first */
+ if (last <= 0)
+ list_del_init(&_realm->rebuild_item);
+ }
+}
+
+
+/*
+ * helper to allocate and decode an array of snapids. free prior
+ * instance, if any.
+ */
+static int dup_array(u64 **dst, __le64 *src, u32 num)
+{
+ u32 i;
+
+ kfree(*dst);
+ if (num) {
+ *dst = kcalloc(num, sizeof(u64), GFP_NOFS);
+ if (!*dst)
+ return -ENOMEM;
+ for (i = 0; i < num; i++)
+ (*dst)[i] = get_unaligned_le64(src + i);
+ } else {
+ *dst = NULL;
+ }
+ return 0;
+}
+
+static bool has_new_snaps(struct ceph_snap_context *o,
+ struct ceph_snap_context *n)
+{
+ if (n->num_snaps == 0)
+ return false;
+ /* snaps are in descending order */
+ return n->snaps[0] > o->seq;
+}
+
+/*
+ * When a snapshot is applied, the size/mtime inode metadata is queued
+ * in a ceph_cap_snap (one for each snapshot) until writeback
+ * completes and the metadata can be flushed back to the MDS.
+ *
+ * However, if a (sync) write is currently in-progress when we apply
+ * the snapshot, we have to wait until the write succeeds or fails
+ * (and a final size/mtime is known). In this case the
+ * cap_snap->writing = 1, and is said to be "pending." When the write
+ * finishes, we __ceph_finish_cap_snap().
+ *
+ * Caller must hold snap_rwsem for read (i.e., the realm topology won't
+ * change).
+ */
+static void ceph_queue_cap_snap(struct ceph_inode_info *ci,
+ struct ceph_cap_snap **pcapsnap)
+{
+ struct inode *inode = &ci->netfs.inode;
+ struct ceph_snap_context *old_snapc, *new_snapc;
+ struct ceph_cap_snap *capsnap = *pcapsnap;
+ struct ceph_buffer *old_blob = NULL;
+ int used, dirty;
+
+ spin_lock(&ci->i_ceph_lock);
+ used = __ceph_caps_used(ci);
+ dirty = __ceph_caps_dirty(ci);
+
+ old_snapc = ci->i_head_snapc;
+ new_snapc = ci->i_snap_realm->cached_context;
+
+ /*
+ * If there is a write in progress, treat that as a dirty Fw,
+ * even though it hasn't completed yet; by the time we finish
+ * up this capsnap it will be.
+ */
+ if (used & CEPH_CAP_FILE_WR)
+ dirty |= CEPH_CAP_FILE_WR;
+
+ if (__ceph_have_pending_cap_snap(ci)) {
+ /* there is no point in queuing multiple "pending" cap_snaps,
+ as no new writes are allowed to start when pending, so any
+ writes in progress now were started before the previous
+ cap_snap. lucky us. */
+ dout("%s %p %llx.%llx already pending\n",
+ __func__, inode, ceph_vinop(inode));
+ goto update_snapc;
+ }
+ if (ci->i_wrbuffer_ref_head == 0 &&
+ !(dirty & (CEPH_CAP_ANY_EXCL|CEPH_CAP_FILE_WR))) {
+ dout("%s %p %llx.%llx nothing dirty|writing\n",
+ __func__, inode, ceph_vinop(inode));
+ goto update_snapc;
+ }
+
+ BUG_ON(!old_snapc);
+
+ /*
+ * There is no need to send FLUSHSNAP message to MDS if there is
+ * no new snapshot. But when there is dirty pages or on-going
+ * writes, we still need to create cap_snap. cap_snap is needed
+ * by the write path and page writeback path.
+ *
+ * also see ceph_try_drop_cap_snap()
+ */
+ if (has_new_snaps(old_snapc, new_snapc)) {
+ if (dirty & (CEPH_CAP_ANY_EXCL|CEPH_CAP_FILE_WR))
+ capsnap->need_flush = true;
+ } else {
+ if (!(used & CEPH_CAP_FILE_WR) &&
+ ci->i_wrbuffer_ref_head == 0) {
+ dout("%s %p %llx.%llx no new_snap|dirty_page|writing\n",
+ __func__, inode, ceph_vinop(inode));
+ goto update_snapc;
+ }
+ }
+
+ dout("%s %p %llx.%llx cap_snap %p queuing under %p %s %s\n",
+ __func__, inode, ceph_vinop(inode), capsnap, old_snapc,
+ ceph_cap_string(dirty), capsnap->need_flush ? "" : "no_flush");
+ ihold(inode);
+
+ capsnap->follows = old_snapc->seq;
+ capsnap->issued = __ceph_caps_issued(ci, NULL);
+ capsnap->dirty = dirty;
+
+ capsnap->mode = inode->i_mode;
+ capsnap->uid = inode->i_uid;
+ capsnap->gid = inode->i_gid;
+
+ if (dirty & CEPH_CAP_XATTR_EXCL) {
+ old_blob = __ceph_build_xattrs_blob(ci);
+ capsnap->xattr_blob =
+ ceph_buffer_get(ci->i_xattrs.blob);
+ capsnap->xattr_version = ci->i_xattrs.version;
+ } else {
+ capsnap->xattr_blob = NULL;
+ capsnap->xattr_version = 0;
+ }
+
+ capsnap->inline_data = ci->i_inline_version != CEPH_INLINE_NONE;
+
+ /* dirty page count moved from _head to this cap_snap;
+ all subsequent writes page dirties occur _after_ this
+ snapshot. */
+ capsnap->dirty_pages = ci->i_wrbuffer_ref_head;
+ ci->i_wrbuffer_ref_head = 0;
+ capsnap->context = old_snapc;
+ list_add_tail(&capsnap->ci_item, &ci->i_cap_snaps);
+
+ if (used & CEPH_CAP_FILE_WR) {
+ dout("%s %p %llx.%llx cap_snap %p snapc %p seq %llu used WR,"
+ " now pending\n", __func__, inode, ceph_vinop(inode),
+ capsnap, old_snapc, old_snapc->seq);
+ capsnap->writing = 1;
+ } else {
+ /* note mtime, size NOW. */
+ __ceph_finish_cap_snap(ci, capsnap);
+ }
+ *pcapsnap = NULL;
+ old_snapc = NULL;
+
+update_snapc:
+ if (ci->i_wrbuffer_ref_head == 0 &&
+ ci->i_wr_ref == 0 &&
+ ci->i_dirty_caps == 0 &&
+ ci->i_flushing_caps == 0) {
+ ci->i_head_snapc = NULL;
+ } else {
+ ci->i_head_snapc = ceph_get_snap_context(new_snapc);
+ dout(" new snapc is %p\n", new_snapc);
+ }
+ spin_unlock(&ci->i_ceph_lock);
+
+ ceph_buffer_put(old_blob);
+ ceph_put_snap_context(old_snapc);
+}
+
+/*
+ * Finalize the size, mtime for a cap_snap.. that is, settle on final values
+ * to be used for the snapshot, to be flushed back to the mds.
+ *
+ * If capsnap can now be flushed, add to snap_flush list, and return 1.
+ *
+ * Caller must hold i_ceph_lock.
+ */
+int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
+ struct ceph_cap_snap *capsnap)
+{
+ struct inode *inode = &ci->netfs.inode;
+ struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
+
+ BUG_ON(capsnap->writing);
+ capsnap->size = i_size_read(inode);
+ capsnap->mtime = inode->i_mtime;
+ capsnap->atime = inode->i_atime;
+ capsnap->ctime = inode->i_ctime;
+ capsnap->btime = ci->i_btime;
+ capsnap->change_attr = inode_peek_iversion_raw(inode);
+ capsnap->time_warp_seq = ci->i_time_warp_seq;
+ capsnap->truncate_size = ci->i_truncate_size;
+ capsnap->truncate_seq = ci->i_truncate_seq;
+ if (capsnap->dirty_pages) {
+ dout("%s %p %llx.%llx cap_snap %p snapc %p %llu %s s=%llu "
+ "still has %d dirty pages\n", __func__, inode,
+ ceph_vinop(inode), capsnap, capsnap->context,
+ capsnap->context->seq, ceph_cap_string(capsnap->dirty),
+ capsnap->size, capsnap->dirty_pages);
+ return 0;
+ }
+
+ /* Fb cap still in use, delay it */
+ if (ci->i_wb_ref) {
+ dout("%s %p %llx.%llx cap_snap %p snapc %p %llu %s s=%llu "
+ "used WRBUFFER, delaying\n", __func__, inode,
+ ceph_vinop(inode), capsnap, capsnap->context,
+ capsnap->context->seq, ceph_cap_string(capsnap->dirty),
+ capsnap->size);
+ capsnap->writing = 1;
+ return 0;
+ }
+
+ ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS;
+ dout("%s %p %llx.%llx cap_snap %p snapc %p %llu %s s=%llu\n",
+ __func__, inode, ceph_vinop(inode), capsnap, capsnap->context,
+ capsnap->context->seq, ceph_cap_string(capsnap->dirty),
+ capsnap->size);
+
+ spin_lock(&mdsc->snap_flush_lock);
+ if (list_empty(&ci->i_snap_flush_item)) {
+ ihold(inode);
+ list_add_tail(&ci->i_snap_flush_item, &mdsc->snap_flush_list);
+ }
+ spin_unlock(&mdsc->snap_flush_lock);
+ return 1; /* caller may want to ceph_flush_snaps */
+}
+
+/*
+ * Queue cap_snaps for snap writeback for this realm and its children.
+ * Called under snap_rwsem, so realm topology won't change.
+ */
+static void queue_realm_cap_snaps(struct ceph_snap_realm *realm)
+{
+ struct ceph_inode_info *ci;
+ struct inode *lastinode = NULL;
+ struct ceph_cap_snap *capsnap = NULL;
+
+ dout("%s %p %llx inode\n", __func__, realm, realm->ino);
+
+ spin_lock(&realm->inodes_with_caps_lock);
+ list_for_each_entry(ci, &realm->inodes_with_caps, i_snap_realm_item) {
+ struct inode *inode = igrab(&ci->netfs.inode);
+ if (!inode)
+ continue;
+ spin_unlock(&realm->inodes_with_caps_lock);
+ iput(lastinode);
+ lastinode = inode;
+
+ /*
+ * Allocate the capsnap memory outside of ceph_queue_cap_snap()
+ * to reduce very possible but unnecessary frequently memory
+ * allocate/free in this loop.
+ */
+ if (!capsnap) {
+ capsnap = kmem_cache_zalloc(ceph_cap_snap_cachep, GFP_NOFS);
+ if (!capsnap) {
+ pr_err("ENOMEM allocating ceph_cap_snap on %p\n",
+ inode);
+ return;
+ }
+ }
+ capsnap->cap_flush.is_capsnap = true;
+ refcount_set(&capsnap->nref, 1);
+ INIT_LIST_HEAD(&capsnap->cap_flush.i_list);
+ INIT_LIST_HEAD(&capsnap->cap_flush.g_list);
+ INIT_LIST_HEAD(&capsnap->ci_item);
+
+ ceph_queue_cap_snap(ci, &capsnap);
+ spin_lock(&realm->inodes_with_caps_lock);
+ }
+ spin_unlock(&realm->inodes_with_caps_lock);
+ iput(lastinode);
+
+ if (capsnap)
+ kmem_cache_free(ceph_cap_snap_cachep, capsnap);
+ dout("%s %p %llx done\n", __func__, realm, realm->ino);
+}
+
+/*
+ * Parse and apply a snapblob "snap trace" from the MDS. This specifies
+ * the snap realm parameters from a given realm and all of its ancestors,
+ * up to the root.
+ *
+ * Caller must hold snap_rwsem for write.
+ */
+int ceph_update_snap_trace(struct ceph_mds_client *mdsc,
+ void *p, void *e, bool deletion,
+ struct ceph_snap_realm **realm_ret)
+{
+ struct ceph_mds_snap_realm *ri; /* encoded */
+ __le64 *snaps; /* encoded */
+ __le64 *prior_parent_snaps; /* encoded */
+ struct ceph_snap_realm *realm;
+ struct ceph_snap_realm *first_realm = NULL;
+ struct ceph_snap_realm *realm_to_rebuild = NULL;
+ struct ceph_client *client = mdsc->fsc->client;
+ int rebuild_snapcs;
+ int err = -ENOMEM;
+ int ret;
+ LIST_HEAD(dirty_realms);
+
+ lockdep_assert_held_write(&mdsc->snap_rwsem);
+
+ dout("%s deletion=%d\n", __func__, deletion);
+more:
+ realm = NULL;
+ rebuild_snapcs = 0;
+ ceph_decode_need(&p, e, sizeof(*ri), bad);
+ ri = p;
+ p += sizeof(*ri);
+ ceph_decode_need(&p, e, sizeof(u64)*(le32_to_cpu(ri->num_snaps) +
+ le32_to_cpu(ri->num_prior_parent_snaps)), bad);
+ snaps = p;
+ p += sizeof(u64) * le32_to_cpu(ri->num_snaps);
+ prior_parent_snaps = p;
+ p += sizeof(u64) * le32_to_cpu(ri->num_prior_parent_snaps);
+
+ realm = ceph_lookup_snap_realm(mdsc, le64_to_cpu(ri->ino));
+ if (!realm) {
+ realm = ceph_create_snap_realm(mdsc, le64_to_cpu(ri->ino));
+ if (IS_ERR(realm)) {
+ err = PTR_ERR(realm);
+ goto fail;
+ }
+ }
+
+ /* ensure the parent is correct */
+ err = adjust_snap_realm_parent(mdsc, realm, le64_to_cpu(ri->parent));
+ if (err < 0)
+ goto fail;
+ rebuild_snapcs += err;
+
+ if (le64_to_cpu(ri->seq) > realm->seq) {
+ dout("%s updating %llx %p %lld -> %lld\n", __func__,
+ realm->ino, realm, realm->seq, le64_to_cpu(ri->seq));
+ /* update realm parameters, snap lists */
+ realm->seq = le64_to_cpu(ri->seq);
+ realm->created = le64_to_cpu(ri->created);
+ realm->parent_since = le64_to_cpu(ri->parent_since);
+
+ realm->num_snaps = le32_to_cpu(ri->num_snaps);
+ err = dup_array(&realm->snaps, snaps, realm->num_snaps);
+ if (err < 0)
+ goto fail;
+
+ realm->num_prior_parent_snaps =
+ le32_to_cpu(ri->num_prior_parent_snaps);
+ err = dup_array(&realm->prior_parent_snaps, prior_parent_snaps,
+ realm->num_prior_parent_snaps);
+ if (err < 0)
+ goto fail;
+
+ if (realm->seq > mdsc->last_snap_seq)
+ mdsc->last_snap_seq = realm->seq;
+
+ rebuild_snapcs = 1;
+ } else if (!realm->cached_context) {
+ dout("%s %llx %p seq %lld new\n", __func__,
+ realm->ino, realm, realm->seq);
+ rebuild_snapcs = 1;
+ } else {
+ dout("%s %llx %p seq %lld unchanged\n", __func__,
+ realm->ino, realm, realm->seq);
+ }
+
+ dout("done with %llx %p, rebuild_snapcs=%d, %p %p\n", realm->ino,
+ realm, rebuild_snapcs, p, e);
+
+ /*
+ * this will always track the uppest parent realm from which
+ * we need to rebuild the snapshot contexts _downward_ in
+ * hierarchy.
+ */
+ if (rebuild_snapcs)
+ realm_to_rebuild = realm;
+
+ /* rebuild_snapcs when we reach the _end_ (root) of the trace */
+ if (realm_to_rebuild && p >= e)
+ rebuild_snap_realms(realm_to_rebuild, &dirty_realms);
+
+ if (!first_realm)
+ first_realm = realm;
+ else
+ ceph_put_snap_realm(mdsc, realm);
+
+ if (p < e)
+ goto more;
+
+ /*
+ * queue cap snaps _after_ we've built the new snap contexts,
+ * so that i_head_snapc can be set appropriately.
+ */
+ while (!list_empty(&dirty_realms)) {
+ realm = list_first_entry(&dirty_realms, struct ceph_snap_realm,
+ dirty_item);
+ list_del_init(&realm->dirty_item);
+ queue_realm_cap_snaps(realm);
+ }
+
+ if (realm_ret)
+ *realm_ret = first_realm;
+ else
+ ceph_put_snap_realm(mdsc, first_realm);
+
+ __cleanup_empty_realms(mdsc);
+ return 0;
+
+bad:
+ err = -EIO;
+fail:
+ if (realm && !IS_ERR(realm))
+ ceph_put_snap_realm(mdsc, realm);
+ if (first_realm)
+ ceph_put_snap_realm(mdsc, first_realm);
+ pr_err("%s error %d\n", __func__, err);
+
+ /*
+ * When receiving a corrupted snap trace we don't know what
+ * exactly has happened in MDS side. And we shouldn't continue
+ * writing to OSD, which may corrupt the snapshot contents.
+ *
+ * Just try to blocklist this kclient and then this kclient
+ * must be remounted to continue after the corrupted metadata
+ * fixed in the MDS side.
+ */
+ WRITE_ONCE(mdsc->fsc->mount_state, CEPH_MOUNT_FENCE_IO);
+ ret = ceph_monc_blocklist_add(&client->monc, &client->msgr.inst.addr);
+ if (ret)
+ pr_err("%s failed to blocklist %s: %d\n", __func__,
+ ceph_pr_addr(&client->msgr.inst.addr), ret);
+
+ WARN(1, "%s: %s%sdo remount to continue%s",
+ __func__, ret ? "" : ceph_pr_addr(&client->msgr.inst.addr),
+ ret ? "" : " was blocklisted, ",
+ err == -EIO ? " after corrupted snaptrace is fixed" : "");
+
+ return err;
+}
+
+
+/*
+ * Send any cap_snaps that are queued for flush. Try to carry
+ * s_mutex across multiple snap flushes to avoid locking overhead.
+ *
+ * Caller holds no locks.
+ */
+static void flush_snaps(struct ceph_mds_client *mdsc)
+{
+ struct ceph_inode_info *ci;
+ struct inode *inode;
+ struct ceph_mds_session *session = NULL;
+
+ dout("%s\n", __func__);
+ spin_lock(&mdsc->snap_flush_lock);
+ while (!list_empty(&mdsc->snap_flush_list)) {
+ ci = list_first_entry(&mdsc->snap_flush_list,
+ struct ceph_inode_info, i_snap_flush_item);
+ inode = &ci->netfs.inode;
+ ihold(inode);
+ spin_unlock(&mdsc->snap_flush_lock);
+ ceph_flush_snaps(ci, &session);
+ iput(inode);
+ spin_lock(&mdsc->snap_flush_lock);
+ }
+ spin_unlock(&mdsc->snap_flush_lock);
+
+ ceph_put_mds_session(session);
+ dout("%s done\n", __func__);
+}
+
+/**
+ * ceph_change_snap_realm - change the snap_realm for an inode
+ * @inode: inode to move to new snap realm
+ * @realm: new realm to move inode into (may be NULL)
+ *
+ * Detach an inode from its old snaprealm (if any) and attach it to
+ * the new snaprealm (if any). The old snap realm reference held by
+ * the inode is put. If realm is non-NULL, then the caller's reference
+ * to it is taken over by the inode.
+ */
+void ceph_change_snap_realm(struct inode *inode, struct ceph_snap_realm *realm)
+{
+ struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
+ struct ceph_snap_realm *oldrealm = ci->i_snap_realm;
+
+ lockdep_assert_held(&ci->i_ceph_lock);
+
+ if (oldrealm) {
+ spin_lock(&oldrealm->inodes_with_caps_lock);
+ list_del_init(&ci->i_snap_realm_item);
+ if (oldrealm->ino == ci->i_vino.ino)
+ oldrealm->inode = NULL;
+ spin_unlock(&oldrealm->inodes_with_caps_lock);
+ ceph_put_snap_realm(mdsc, oldrealm);
+ }
+
+ ci->i_snap_realm = realm;
+
+ if (realm) {
+ spin_lock(&realm->inodes_with_caps_lock);
+ list_add(&ci->i_snap_realm_item, &realm->inodes_with_caps);
+ if (realm->ino == ci->i_vino.ino)
+ realm->inode = inode;
+ spin_unlock(&realm->inodes_with_caps_lock);
+ }
+}
+
+/*
+ * Handle a snap notification from the MDS.
+ *
+ * This can take two basic forms: the simplest is just a snap creation
+ * or deletion notification on an existing realm. This should update the
+ * realm and its children.
+ *
+ * The more difficult case is realm creation, due to snap creation at a
+ * new point in the file hierarchy, or due to a rename that moves a file or
+ * directory into another realm.
+ */
+void ceph_handle_snap(struct ceph_mds_client *mdsc,
+ struct ceph_mds_session *session,
+ struct ceph_msg *msg)
+{
+ struct super_block *sb = mdsc->fsc->sb;
+ int mds = session->s_mds;
+ u64 split;
+ int op;
+ int trace_len;
+ struct ceph_snap_realm *realm = NULL;
+ void *p = msg->front.iov_base;
+ void *e = p + msg->front.iov_len;
+ struct ceph_mds_snap_head *h;
+ int num_split_inos, num_split_realms;
+ __le64 *split_inos = NULL, *split_realms = NULL;
+ int i;
+ int locked_rwsem = 0;
+ bool close_sessions = false;
+
+ if (!ceph_inc_mds_stopping_blocker(mdsc, session))
+ return;
+
+ /* decode */
+ if (msg->front.iov_len < sizeof(*h))
+ goto bad;
+ h = p;
+ op = le32_to_cpu(h->op);
+ split = le64_to_cpu(h->split); /* non-zero if we are splitting an
+ * existing realm */
+ num_split_inos = le32_to_cpu(h->num_split_inos);
+ num_split_realms = le32_to_cpu(h->num_split_realms);
+ trace_len = le32_to_cpu(h->trace_len);
+ p += sizeof(*h);
+
+ dout("%s from mds%d op %s split %llx tracelen %d\n", __func__,
+ mds, ceph_snap_op_name(op), split, trace_len);
+
+ down_write(&mdsc->snap_rwsem);
+ locked_rwsem = 1;
+
+ if (op == CEPH_SNAP_OP_SPLIT) {
+ struct ceph_mds_snap_realm *ri;
+
+ /*
+ * A "split" breaks part of an existing realm off into
+ * a new realm. The MDS provides a list of inodes
+ * (with caps) and child realms that belong to the new
+ * child.
+ */
+ split_inos = p;
+ p += sizeof(u64) * num_split_inos;
+ split_realms = p;
+ p += sizeof(u64) * num_split_realms;
+ ceph_decode_need(&p, e, sizeof(*ri), bad);
+ /* we will peek at realm info here, but will _not_
+ * advance p, as the realm update will occur below in
+ * ceph_update_snap_trace. */
+ ri = p;
+
+ realm = ceph_lookup_snap_realm(mdsc, split);
+ if (!realm) {
+ realm = ceph_create_snap_realm(mdsc, split);
+ if (IS_ERR(realm))
+ goto out;
+ }
+
+ dout("splitting snap_realm %llx %p\n", realm->ino, realm);
+ for (i = 0; i < num_split_inos; i++) {
+ struct ceph_vino vino = {
+ .ino = le64_to_cpu(split_inos[i]),
+ .snap = CEPH_NOSNAP,
+ };
+ struct inode *inode = ceph_find_inode(sb, vino);
+ struct ceph_inode_info *ci;
+
+ if (!inode)
+ continue;
+ ci = ceph_inode(inode);
+
+ spin_lock(&ci->i_ceph_lock);
+ if (!ci->i_snap_realm)
+ goto skip_inode;
+ /*
+ * If this inode belongs to a realm that was
+ * created after our new realm, we experienced
+ * a race (due to another split notifications
+ * arriving from a different MDS). So skip
+ * this inode.
+ */
+ if (ci->i_snap_realm->created >
+ le64_to_cpu(ri->created)) {
+ dout(" leaving %p %llx.%llx in newer realm %llx %p\n",
+ inode, ceph_vinop(inode), ci->i_snap_realm->ino,
+ ci->i_snap_realm);
+ goto skip_inode;
+ }
+ dout(" will move %p %llx.%llx to split realm %llx %p\n",
+ inode, ceph_vinop(inode), realm->ino, realm);
+
+ ceph_get_snap_realm(mdsc, realm);
+ ceph_change_snap_realm(inode, realm);
+ spin_unlock(&ci->i_ceph_lock);
+ iput(inode);
+ continue;
+
+skip_inode:
+ spin_unlock(&ci->i_ceph_lock);
+ iput(inode);
+ }
+
+ /* we may have taken some of the old realm's children. */
+ for (i = 0; i < num_split_realms; i++) {
+ struct ceph_snap_realm *child =
+ __lookup_snap_realm(mdsc,
+ le64_to_cpu(split_realms[i]));
+ if (!child)
+ continue;
+ adjust_snap_realm_parent(mdsc, child, realm->ino);
+ }
+ } else {
+ /*
+ * In the non-split case both 'num_split_inos' and
+ * 'num_split_realms' should be 0, making this a no-op.
+ * However the MDS happens to populate 'split_realms' list
+ * in one of the UPDATE op cases by mistake.
+ *
+ * Skip both lists just in case to ensure that 'p' is
+ * positioned at the start of realm info, as expected by
+ * ceph_update_snap_trace().
+ */
+ p += sizeof(u64) * num_split_inos;
+ p += sizeof(u64) * num_split_realms;
+ }
+
+ /*
+ * update using the provided snap trace. if we are deleting a
+ * snap, we can avoid queueing cap_snaps.
+ */
+ if (ceph_update_snap_trace(mdsc, p, e,
+ op == CEPH_SNAP_OP_DESTROY,
+ NULL)) {
+ close_sessions = true;
+ goto bad;
+ }
+
+ if (op == CEPH_SNAP_OP_SPLIT)
+ /* we took a reference when we created the realm, above */
+ ceph_put_snap_realm(mdsc, realm);
+
+ __cleanup_empty_realms(mdsc);
+
+ up_write(&mdsc->snap_rwsem);
+
+ flush_snaps(mdsc);
+ ceph_dec_mds_stopping_blocker(mdsc);
+ return;
+
+bad:
+ pr_err("%s corrupt snap message from mds%d\n", __func__, mds);
+ ceph_msg_dump(msg);
+out:
+ if (locked_rwsem)
+ up_write(&mdsc->snap_rwsem);
+
+ ceph_dec_mds_stopping_blocker(mdsc);
+
+ if (close_sessions)
+ ceph_mdsc_close_sessions(mdsc);
+ return;
+}
+
+struct ceph_snapid_map* ceph_get_snapid_map(struct ceph_mds_client *mdsc,
+ u64 snap)
+{
+ struct ceph_snapid_map *sm, *exist;
+ struct rb_node **p, *parent;
+ int ret;
+
+ exist = NULL;
+ spin_lock(&mdsc->snapid_map_lock);
+ p = &mdsc->snapid_map_tree.rb_node;
+ while (*p) {
+ exist = rb_entry(*p, struct ceph_snapid_map, node);
+ if (snap > exist->snap) {
+ p = &(*p)->rb_left;
+ } else if (snap < exist->snap) {
+ p = &(*p)->rb_right;
+ } else {
+ if (atomic_inc_return(&exist->ref) == 1)
+ list_del_init(&exist->lru);
+ break;
+ }
+ exist = NULL;
+ }
+ spin_unlock(&mdsc->snapid_map_lock);
+ if (exist) {
+ dout("%s found snapid map %llx -> %x\n", __func__,
+ exist->snap, exist->dev);
+ return exist;
+ }
+
+ sm = kmalloc(sizeof(*sm), GFP_NOFS);
+ if (!sm)
+ return NULL;
+
+ ret = get_anon_bdev(&sm->dev);
+ if (ret < 0) {
+ kfree(sm);
+ return NULL;
+ }
+
+ INIT_LIST_HEAD(&sm->lru);
+ atomic_set(&sm->ref, 1);
+ sm->snap = snap;
+
+ exist = NULL;
+ parent = NULL;
+ p = &mdsc->snapid_map_tree.rb_node;
+ spin_lock(&mdsc->snapid_map_lock);
+ while (*p) {
+ parent = *p;
+ exist = rb_entry(*p, struct ceph_snapid_map, node);
+ if (snap > exist->snap)
+ p = &(*p)->rb_left;
+ else if (snap < exist->snap)
+ p = &(*p)->rb_right;
+ else
+ break;
+ exist = NULL;
+ }
+ if (exist) {
+ if (atomic_inc_return(&exist->ref) == 1)
+ list_del_init(&exist->lru);
+ } else {
+ rb_link_node(&sm->node, parent, p);
+ rb_insert_color(&sm->node, &mdsc->snapid_map_tree);
+ }
+ spin_unlock(&mdsc->snapid_map_lock);
+ if (exist) {
+ free_anon_bdev(sm->dev);
+ kfree(sm);
+ dout("%s found snapid map %llx -> %x\n", __func__,
+ exist->snap, exist->dev);
+ return exist;
+ }
+
+ dout("%s create snapid map %llx -> %x\n", __func__,
+ sm->snap, sm->dev);
+ return sm;
+}
+
+void ceph_put_snapid_map(struct ceph_mds_client* mdsc,
+ struct ceph_snapid_map *sm)
+{
+ if (!sm)
+ return;
+ if (atomic_dec_and_lock(&sm->ref, &mdsc->snapid_map_lock)) {
+ if (!RB_EMPTY_NODE(&sm->node)) {
+ sm->last_used = jiffies;
+ list_add_tail(&sm->lru, &mdsc->snapid_map_lru);
+ spin_unlock(&mdsc->snapid_map_lock);
+ } else {
+ /* already cleaned up by
+ * ceph_cleanup_snapid_map() */
+ spin_unlock(&mdsc->snapid_map_lock);
+ kfree(sm);
+ }
+ }
+}
+
+void ceph_trim_snapid_map(struct ceph_mds_client *mdsc)
+{
+ struct ceph_snapid_map *sm;
+ unsigned long now;
+ LIST_HEAD(to_free);
+
+ spin_lock(&mdsc->snapid_map_lock);
+ now = jiffies;
+
+ while (!list_empty(&mdsc->snapid_map_lru)) {
+ sm = list_first_entry(&mdsc->snapid_map_lru,
+ struct ceph_snapid_map, lru);
+ if (time_after(sm->last_used + CEPH_SNAPID_MAP_TIMEOUT, now))
+ break;
+
+ rb_erase(&sm->node, &mdsc->snapid_map_tree);
+ list_move(&sm->lru, &to_free);
+ }
+ spin_unlock(&mdsc->snapid_map_lock);
+
+ while (!list_empty(&to_free)) {
+ sm = list_first_entry(&to_free, struct ceph_snapid_map, lru);
+ list_del(&sm->lru);
+ dout("trim snapid map %llx -> %x\n", sm->snap, sm->dev);
+ free_anon_bdev(sm->dev);
+ kfree(sm);
+ }
+}
+
+void ceph_cleanup_snapid_map(struct ceph_mds_client *mdsc)
+{
+ struct ceph_snapid_map *sm;
+ struct rb_node *p;
+ LIST_HEAD(to_free);
+
+ spin_lock(&mdsc->snapid_map_lock);
+ while ((p = rb_first(&mdsc->snapid_map_tree))) {
+ sm = rb_entry(p, struct ceph_snapid_map, node);
+ rb_erase(p, &mdsc->snapid_map_tree);
+ RB_CLEAR_NODE(p);
+ list_move(&sm->lru, &to_free);
+ }
+ spin_unlock(&mdsc->snapid_map_lock);
+
+ while (!list_empty(&to_free)) {
+ sm = list_first_entry(&to_free, struct ceph_snapid_map, lru);
+ list_del(&sm->lru);
+ free_anon_bdev(sm->dev);
+ if (WARN_ON_ONCE(atomic_read(&sm->ref))) {
+ pr_err("snapid map %llx -> %x still in use\n",
+ sm->snap, sm->dev);
+ }
+ kfree(sm);
+ }
+}