diff options
Diffstat (limited to 'xlators/mount/fuse/src/fuse-resolve.c')
| -rw-r--r-- | xlators/mount/fuse/src/fuse-resolve.c | 724 |
1 files changed, 724 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 000000000..8565ce0e4 --- /dev/null +++ b/xlators/mount/fuse/src/fuse-resolve.c @@ -0,0 +1,724 @@ +/* + 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. +*/ +#ifndef _CONFIG_H +#define _CONFIG_H +#include "config.h" +#endif + +#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); + +gf_boolean_t fuse_inode_needs_lookup (inode_t *inode, xlator_t *this); + +static int +fuse_resolve_loc_touchup (fuse_state_t *state) +{ + fuse_resolve_t *resolve = NULL; + loc_t *loc = NULL; + char *path = NULL; + int ret = 0; + + resolve = state->resolve_now; + loc = state->loc_now; + + if (!loc->path) { + if (loc->parent && resolve->bname) { + ret = inode_path (loc->parent, resolve->bname, &path); + uuid_copy (loc->pargfid, loc->parent->gfid); + loc->name = resolve->bname; + } else if (loc->inode) { + ret = inode_path (loc->inode, NULL, &path); + uuid_copy (loc->gfid, loc->inode->gfid); + } + if (ret) + gf_log (THIS->name, GF_LOG_TRACE, + "return value inode_path %d", ret); + loc->path = path; + } + + 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; + + 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); + + 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); + uuid_copy (resolve_loc->pargfid, state->loc_now->pargfid); + resolve_loc->name = resolve->bname; + 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; + + 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 (uuid_is_null (resolve->gfid)) { + resolve->op_ret = -1; + } else { + resolve->op_ret = -2; + } + + resolve->op_errno = op_errno; + goto out; + } + + loc_wipe (&resolve->resolve_loc); + + link_inode = inode_link (inode, NULL, NULL, buf); + + if (!link_inode) + goto out; + + if (!uuid_is_null (resolve->gfid)) { + loc_now->inode = link_inode; + goto out; + } + + loc_now->parent = link_inode; + uuid_copy (loc_now->pargfid, link_inode->gfid); + + 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 (!uuid_is_null (resolve->pargfid)) { + uuid_copy (resolve_loc->gfid, resolve->pargfid); + } else if (!uuid_is_null (resolve->gfid)) { + 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; + + resolve = state->resolve_now; + loc = state->loc_now; + + loc->name = resolve->bname; + + parent = resolve->parhint; + if (parent->table == state->itable) { + if (fuse_inode_needs_lookup (parent, THIS)) + return 1; + + /* no graph switches since */ + loc->parent = inode_ref (parent); + 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 == 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 (fuse_inode_needs_lookup (parent, THIS)) { + inode_unref (parent); + return 1; + } + + loc->parent = parent; + uuid_copy (loc->pargfid, resolve->pargfid); + + inode = inode_grep (state->itable, parent, loc->name); + if (inode) { + 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 (!fuse_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); + + 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 inline 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 (uuid_is_null (state->gfid)) + goto out; + + if (!state->xdata) + state->xdata = dict_new (); + + if (!state->xdata) { + ret = -1; + goto out; + } + + ret = dict_set_static_bin (state->xdata, "gfid-req", + state->gfid, sizeof (state->gfid)); +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); + 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); + 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 (!uuid_is_null (resolve->pargfid)) { + + fuse_resolve_parent (state); + + } else if (!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_resume_fn_t fn = NULL; + + fn = state->resume_fn; + + fn (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; +} |