diff options
Diffstat (limited to 'xlators/mount/fuse/src/fuse-resolve.c')
| -rw-r--r-- | xlators/mount/fuse/src/fuse-resolve.c | 683 |
1 files changed, 683 insertions, 0 deletions
diff --git a/xlators/mount/fuse/src/fuse-resolve.c b/xlators/mount/fuse/src/fuse-resolve.c new file mode 100644 index 00000000000..6206fd47325 --- /dev/null +++ b/xlators/mount/fuse/src/fuse-resolve.c @@ -0,0 +1,683 @@ +/* + Copyright (c) 2010-2012 Red Hat, Inc. <http://www.redhat.com> + This file is part of GlusterFS. + + This file is licensed to you under your choice of the GNU Lesser + General Public License, version 3 or any later version (LGPLv3 or + later), or the GNU General Public License, version 2 (GPLv2), in all + cases as published by the Free Software Foundation. +*/ +#include "fuse-bridge.h" + +static int +fuse_resolve_all(fuse_state_t *state); + +int +fuse_resolve_continue(fuse_state_t *state); +int +fuse_resolve_entry_simple(fuse_state_t *state); +int +fuse_resolve_inode_simple(fuse_state_t *state); +int +fuse_migrate_fd(xlator_t *this, fd_t *fd, xlator_t *old_subvol, + xlator_t *new_subvol); + +fuse_fd_ctx_t * +fuse_fd_ctx_get(xlator_t *this, fd_t *fd); + +static int +fuse_resolve_loc_touchup(fuse_state_t *state) +{ + fuse_resolve_t *resolve = NULL; + loc_t *loc = NULL; + + resolve = state->resolve_now; + loc = state->loc_now; + + loc_touchup(loc, resolve->bname); + return 0; +} + +int +fuse_resolve_entry_cbk(call_frame_t *frame, void *cookie, xlator_t *this, + int op_ret, int op_errno, inode_t *inode, + struct iatt *buf, dict_t *xattr, struct iatt *postparent) +{ + fuse_state_t *state = NULL; + fuse_resolve_t *resolve = NULL; + inode_t *link_inode = NULL; + loc_t *resolve_loc = NULL; + uint64_t ctx_value = LOOKUP_NOT_NEEDED; + + state = frame->root->state; + resolve = state->resolve_now; + resolve_loc = &resolve->resolve_loc; + + STACK_DESTROY(frame->root); + + if (op_ret == -1) { + gf_log(this->name, (op_errno == ENOENT) ? GF_LOG_DEBUG : GF_LOG_WARNING, + "%s/%s: failed to resolve (%s)", uuid_utoa(resolve_loc->pargfid), + resolve_loc->name, strerror(op_errno)); + resolve->op_ret = -1; + resolve->op_errno = op_errno; + goto out; + } + + link_inode = inode_link(inode, resolve_loc->parent, resolve_loc->name, buf); + if (link_inode == inode) + inode_ctx_set(link_inode, this, &ctx_value); + state->loc_now->inode = link_inode; + +out: + loc_wipe(resolve_loc); + + fuse_resolve_continue(state); + return 0; +} + +int +fuse_resolve_entry(fuse_state_t *state) +{ + fuse_resolve_t *resolve = NULL; + loc_t *resolve_loc = NULL; + + resolve = state->resolve_now; + resolve_loc = &resolve->resolve_loc; + + resolve_loc->parent = inode_ref(state->loc_now->parent); + gf_uuid_copy(resolve_loc->pargfid, state->loc_now->pargfid); + resolve_loc->name = resolve->bname; + + resolve_loc->inode = inode_grep(state->itable, resolve->parhint, + resolve->bname); + if (!resolve_loc->inode) { + resolve_loc->inode = inode_new(state->itable); + } + inode_path(resolve_loc->parent, resolve_loc->name, + (char **)&resolve_loc->path); + + FUSE_FOP(state, fuse_resolve_entry_cbk, GF_FOP_LOOKUP, lookup, resolve_loc, + NULL); + + return 0; +} + +int +fuse_resolve_gfid_cbk(call_frame_t *frame, void *cookie, xlator_t *this, + int op_ret, int op_errno, inode_t *inode, + struct iatt *buf, dict_t *xattr, struct iatt *postparent) +{ + fuse_state_t *state = NULL; + fuse_resolve_t *resolve = NULL; + inode_t *link_inode = NULL; + loc_t *loc_now = NULL; + inode_t *tmp_inode = NULL; + uint64_t ctx_value = LOOKUP_NOT_NEEDED; + + state = frame->root->state; + resolve = state->resolve_now; + loc_now = state->loc_now; + + STACK_DESTROY(frame->root); + + if (op_ret == -1) { + gf_log(this->name, (op_errno == ENOENT) ? GF_LOG_DEBUG : GF_LOG_WARNING, + "%s: failed to resolve (%s)", + uuid_utoa(resolve->resolve_loc.gfid), strerror(op_errno)); + loc_wipe(&resolve->resolve_loc); + + /* resolve->op_ret can have 3 values: 0, -1, -2. + * 0 : resolution was successful. + * -1: parent inode could not be resolved. + * -2: entry (inode corresponding to path) could not be resolved + */ + + if (gf_uuid_is_null(resolve->gfid)) { + resolve->op_ret = -1; + } else { + resolve->op_ret = -2; + } + + resolve->op_errno = op_errno; + goto out; + } + + link_inode = inode_link(inode, NULL, NULL, buf); + if (link_inode == inode) + inode_ctx_set(link_inode, this, &ctx_value); + + loc_wipe(&resolve->resolve_loc); + + if (!link_inode) + goto out; + + if (!gf_uuid_is_null(resolve->gfid)) { + loc_now->inode = link_inode; + goto out; + } + + loc_now->parent = link_inode; + gf_uuid_copy(loc_now->pargfid, link_inode->gfid); + + tmp_inode = inode_grep(state->itable, link_inode, resolve->bname); + if (tmp_inode && (!inode_needs_lookup(tmp_inode, THIS))) { + loc_now->inode = tmp_inode; + goto out; + } + + inode_unref(tmp_inode); + fuse_resolve_entry(state); + + return 0; +out: + fuse_resolve_continue(state); + return 0; +} + +int +fuse_resolve_gfid(fuse_state_t *state) +{ + fuse_resolve_t *resolve = NULL; + loc_t *resolve_loc = NULL; + int ret = 0; + + resolve = state->resolve_now; + resolve_loc = &resolve->resolve_loc; + + if (!gf_uuid_is_null(resolve->pargfid)) { + gf_uuid_copy(resolve_loc->gfid, resolve->pargfid); + } else if (!gf_uuid_is_null(resolve->gfid)) { + gf_uuid_copy(resolve_loc->gfid, resolve->gfid); + } + + /* inode may already exist in case we are looking up an inode which was + linked through readdirplus */ + resolve_loc->inode = inode_find(state->itable, resolve_loc->gfid); + if (!resolve_loc->inode) + resolve_loc->inode = inode_new(state->itable); + ret = loc_path(resolve_loc, NULL); + + if (ret <= 0) { + gf_log(THIS->name, GF_LOG_WARNING, + "failed to get the path for inode %s", uuid_utoa(resolve->gfid)); + } + + FUSE_FOP(state, fuse_resolve_gfid_cbk, GF_FOP_LOOKUP, lookup, resolve_loc, + NULL); + + return 0; +} + +/* + * Return value: + * 0 - resolved parent and entry (as necessary) + * -1 - resolved parent but not entry (though necessary) + * 1 - resolved neither parent nor entry + */ + +int +fuse_resolve_parent_simple(fuse_state_t *state) +{ + fuse_resolve_t *resolve = NULL; + loc_t *loc = NULL; + inode_t *parent = NULL; + inode_t *inode = NULL; + xlator_t *this = NULL; + + resolve = state->resolve_now; + loc = state->loc_now; + this = state->this; + + loc->name = resolve->bname; + + parent = resolve->parhint; + if (parent->table == state->itable) { + if (inode_needs_lookup(parent, THIS)) + return 1; + + /* no graph switches since */ + loc->parent = inode_ref(parent); + gf_uuid_copy(loc->pargfid, parent->gfid); + loc->inode = inode_grep(state->itable, parent, loc->name); + + /* nodeid for root is 1 and we blindly take the latest graph's + * table->root as the parhint and because of this there is + * ambiguity whether the entry should have existed or not, and + * we took the conservative approach of assuming entry should + * have been there even though it need not have (bug #804592). + */ + + if (loc->inode && inode_needs_lookup(loc->inode, THIS)) { + inode_unref(loc->inode); + loc->inode = NULL; + return -1; + } + + if ((loc->inode == NULL) && __is_root_gfid(parent->gfid)) { + /* non decisive result - entry missing */ + return -1; + } + + /* decisive result - resolution success */ + return 0; + } + + parent = inode_find(state->itable, resolve->pargfid); + if (!parent) { + /* non decisive result - parent missing */ + return 1; + } + if (inode_needs_lookup(parent, THIS)) { + inode_unref(parent); + return 1; + } + + loc->parent = parent; + gf_uuid_copy(loc->pargfid, resolve->pargfid); + + inode = inode_grep(state->itable, parent, loc->name); + if (inode && !inode_needs_lookup(inode, this)) { + loc->inode = inode; + /* decisive result - resolution success */ + return 0; + } + + /* non decisive result - entry missing */ + return -1; +} + +int +fuse_resolve_parent(fuse_state_t *state) +{ + int ret = 0; + + ret = fuse_resolve_parent_simple(state); + if (ret > 0) { + fuse_resolve_gfid(state); + return 0; + } + + if (ret < 0) { + fuse_resolve_entry(state); + return 0; + } + + fuse_resolve_continue(state); + + return 0; +} + +int +fuse_resolve_inode_simple(fuse_state_t *state) +{ + fuse_resolve_t *resolve = NULL; + loc_t *loc = NULL; + inode_t *inode = NULL; + + resolve = state->resolve_now; + loc = state->loc_now; + + inode = resolve->hint; + if (inode->table == state->itable) + inode_ref(inode); + else + inode = inode_find(state->itable, resolve->gfid); + + if (inode) { + if (!inode_needs_lookup(inode, THIS)) + goto found; + /* inode was linked through readdirplus */ + inode_unref(inode); + } + + return 1; +found: + loc->inode = inode; + return 0; +} + +int +fuse_resolve_inode(fuse_state_t *state) +{ + int ret = 0; + + ret = fuse_resolve_inode_simple(state); + + if (ret > 0) { + fuse_resolve_gfid(state); + return 0; + } + + fuse_resolve_continue(state); + + return 0; +} + +int +fuse_migrate_fd_task(void *data) +{ + int ret = -1; + fuse_state_t *state = NULL; + fd_t *basefd = NULL, *oldfd = NULL; + fuse_fd_ctx_t *basefd_ctx = NULL; + xlator_t *old_subvol = NULL; + + state = data; + if (state == NULL) { + goto out; + } + + basefd = state->fd; + + basefd_ctx = fuse_fd_ctx_get(state->this, basefd); + if (!basefd_ctx) + goto out; + + LOCK(&basefd->lock); + { + oldfd = basefd_ctx->activefd ? basefd_ctx->activefd : basefd; + fd_ref(oldfd); + } + UNLOCK(&basefd->lock); + + old_subvol = oldfd->inode->table->xl; + + ret = fuse_migrate_fd(state->this, basefd, old_subvol, + state->active_subvol); + + LOCK(&basefd->lock); + { + if (ret < 0) { + basefd_ctx->migration_failed = 1; + } else { + basefd_ctx->migration_failed = 0; + } + } + UNLOCK(&basefd->lock); + + ret = 0; + +out: + if (oldfd) + fd_unref(oldfd); + + return ret; +} + +static int +fuse_migrate_fd_error(xlator_t *this, fd_t *fd) +{ + fuse_fd_ctx_t *fdctx = NULL; + char error = 0; + + fdctx = fuse_fd_ctx_get(this, fd); + if (fdctx != NULL) { + if (fdctx->migration_failed) { + error = 1; + } + } + + return error; +} + +#define FUSE_FD_GET_ACTIVE_FD(activefd, basefd) \ + do { \ + LOCK(&basefd->lock); \ + { \ + activefd = basefd_ctx->activefd ? basefd_ctx->activefd : basefd; \ + if (activefd != basefd) { \ + fd_ref(activefd); \ + } \ + } \ + UNLOCK(&basefd->lock); \ + \ + if (activefd == basefd) { \ + fd_ref(activefd); \ + } \ + } while (0); + +static int +fuse_resolve_fd(fuse_state_t *state) +{ + fuse_resolve_t *resolve = NULL; + fd_t *basefd = NULL, *activefd = NULL; + xlator_t *active_subvol = NULL, *this = NULL; + int ret = 0; + char fd_migration_error = 0; + fuse_fd_ctx_t *basefd_ctx = NULL; + + resolve = state->resolve_now; + + this = state->this; + + basefd = resolve->fd; + basefd_ctx = fuse_fd_ctx_get(this, basefd); + if (basefd_ctx == NULL) { + gf_log(state->this->name, GF_LOG_WARNING, + "fdctx is NULL for basefd (ptr:%p inode-gfid:%s), " + "resolver erroring out with errno EINVAL", + basefd, uuid_utoa(basefd->inode->gfid)); + resolve->op_ret = -1; + resolve->op_errno = EINVAL; + goto resolve_continue; + } + + FUSE_FD_GET_ACTIVE_FD(activefd, basefd); + + active_subvol = activefd->inode->table->xl; + + fd_migration_error = fuse_migrate_fd_error(state->this, basefd); + if (fd_migration_error) { + resolve->op_ret = -1; + resolve->op_errno = EBADF; + } else if (state->active_subvol != active_subvol) { + ret = synctask_new(state->this->ctx->env, fuse_migrate_fd_task, NULL, + NULL, state); + + fd_migration_error = fuse_migrate_fd_error(state->this, basefd); + fd_unref(activefd); + + FUSE_FD_GET_ACTIVE_FD(activefd, basefd); + active_subvol = activefd->inode->table->xl; + + if ((ret == -1) || fd_migration_error || + (state->active_subvol != active_subvol)) { + if (ret == -1) { + gf_log(state->this->name, GF_LOG_WARNING, + "starting sync-task to migrate " + "basefd (ptr:%p inode-gfid:%s) failed " + "(old-subvolume:%s-%d " + "new-subvolume:%s-%d)", + basefd, uuid_utoa(basefd->inode->gfid), + active_subvol->name, active_subvol->graph->id, + state->active_subvol->name, + state->active_subvol->graph->id); + } else { + gf_log(state->this->name, GF_LOG_WARNING, + "fd migration of basefd " + "(ptr:%p inode-gfid:%s) failed " + "(old-subvolume:%s-%d " + "new-subvolume:%s-%d)", + basefd, uuid_utoa(basefd->inode->gfid), + active_subvol->name, active_subvol->graph->id, + state->active_subvol->name, + state->active_subvol->graph->id); + } + + resolve->op_ret = -1; + resolve->op_errno = EBADF; + } else { + gf_log(state->this->name, GF_LOG_DEBUG, + "basefd (ptr:%p inode-gfid:%s) migrated " + "successfully in resolver " + "(old-subvolume:%s-%d new-subvolume:%s-%d)", + basefd, uuid_utoa(basefd->inode->gfid), active_subvol->name, + active_subvol->graph->id, state->active_subvol->name, + state->active_subvol->graph->id); + } + } + + if ((resolve->op_ret == -1) && (resolve->op_errno == EBADF)) { + gf_log("fuse-resolve", GF_LOG_WARNING, + "migration of basefd (ptr:%p inode-gfid:%s) " + "did not complete, failing fop with EBADF " + "(old-subvolume:%s-%d new-subvolume:%s-%d)", + basefd, uuid_utoa(basefd->inode->gfid), active_subvol->name, + active_subvol->graph->id, state->active_subvol->name, + state->active_subvol->graph->id); + } + + if (activefd != basefd) { + state->fd = fd_ref(activefd); + fd_unref(basefd); + } + + /* state->active_subvol = active_subvol; */ + +resolve_continue: + if (activefd != NULL) { + fd_unref(activefd); + } + + fuse_resolve_continue(state); + + return 0; +} + +int +fuse_gfid_set(fuse_state_t *state) +{ + int ret = 0; + + if (gf_uuid_is_null(state->gfid)) + goto out; + + if (!state->xdata) + state->xdata = dict_new(); + + if (!state->xdata) { + ret = -1; + goto out; + } + + ret = dict_set_gfuuid(state->xdata, "gfid-req", state->gfid, true); +out: + return ret; +} + +int +fuse_resolve_entry_init(fuse_state_t *state, fuse_resolve_t *resolve, ino_t par, + char *name) +{ + inode_t *parent = NULL; + + parent = fuse_ino_to_inode(par, state->this); + gf_uuid_copy(resolve->pargfid, parent->gfid); + resolve->parhint = parent; + resolve->bname = gf_strdup(name); + + return 0; +} + +int +fuse_resolve_inode_init(fuse_state_t *state, fuse_resolve_t *resolve, ino_t ino) +{ + inode_t *inode = NULL; + + inode = fuse_ino_to_inode(ino, state->this); + gf_uuid_copy(resolve->gfid, inode->gfid); + resolve->hint = inode; + + return 0; +} + +int +fuse_resolve_fd_init(fuse_state_t *state, fuse_resolve_t *resolve, fd_t *fd) +{ + resolve->fd = fd_ref(fd); + + return 0; +} + +static int +fuse_resolve(fuse_state_t *state) +{ + fuse_resolve_t *resolve = NULL; + + resolve = state->resolve_now; + + if (resolve->fd) { + fuse_resolve_fd(state); + + } else if (!gf_uuid_is_null(resolve->pargfid)) { + fuse_resolve_parent(state); + + } else if (!gf_uuid_is_null(resolve->gfid)) { + fuse_resolve_inode(state); + + } else { + fuse_resolve_all(state); + } + + return 0; +} + +static int +fuse_resolve_done(fuse_state_t *state) +{ + fuse_fop_resume(state); + return 0; +} + +/* + * This function is called multiple times, once per resolving one location/fd. + * state->resolve_now is used to decide which location/fd is to be resolved now + */ +static int +fuse_resolve_all(fuse_state_t *state) +{ + if (state->resolve_now == NULL) { + state->resolve_now = &state->resolve; + state->loc_now = &state->loc; + + fuse_resolve(state); + + } else if (state->resolve_now == &state->resolve) { + state->resolve_now = &state->resolve2; + state->loc_now = &state->loc2; + + fuse_resolve(state); + + } else if (state->resolve_now == &state->resolve2) { + fuse_resolve_done(state); + + } else { + gf_log("fuse-resolve", GF_LOG_ERROR, + "Invalid pointer for state->resolve_now"); + } + + return 0; +} + +int +fuse_resolve_continue(fuse_state_t *state) +{ + fuse_resolve_loc_touchup(state); + + fuse_resolve_all(state); + + return 0; +} + +int +fuse_resolve_and_resume(fuse_state_t *state, fuse_resume_fn_t fn) +{ + fuse_gfid_set(state); + + state->resume_fn = fn; + + fuse_resolve_all(state); + + return 0; +} |