diff options
Diffstat (limited to 'fs/ceph/inode.c')
| -rw-r--r-- | fs/ceph/inode.c | 3071 |
1 files changed, 3071 insertions, 0 deletions
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c new file mode 100644 index 0000000000..b79100f720 --- /dev/null +++ b/fs/ceph/inode.c @@ -0,0 +1,3071 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/ceph/ceph_debug.h> + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/string.h> +#include <linux/uaccess.h> +#include <linux/kernel.h> +#include <linux/writeback.h> +#include <linux/vmalloc.h> +#include <linux/xattr.h> +#include <linux/posix_acl.h> +#include <linux/random.h> +#include <linux/sort.h> +#include <linux/iversion.h> +#include <linux/fscrypt.h> + +#include "super.h" +#include "mds_client.h" +#include "cache.h" +#include "crypto.h" +#include <linux/ceph/decode.h> + +/* + * Ceph inode operations + * + * Implement basic inode helpers (get, alloc) and inode ops (getattr, + * setattr, etc.), xattr helpers, and helpers for assimilating + * metadata returned by the MDS into our cache. + * + * Also define helpers for doing asynchronous writeback, invalidation, + * and truncation for the benefit of those who can't afford to block + * (typically because they are in the message handler path). + */ + +static const struct inode_operations ceph_symlink_iops; +static const struct inode_operations ceph_encrypted_symlink_iops; + +static void ceph_inode_work(struct work_struct *work); + +/* + * find or create an inode, given the ceph ino number + */ +static int ceph_set_ino_cb(struct inode *inode, void *data) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); + + ci->i_vino = *(struct ceph_vino *)data; + inode->i_ino = ceph_vino_to_ino_t(ci->i_vino); + inode_set_iversion_raw(inode, 0); + percpu_counter_inc(&mdsc->metric.total_inodes); + + return 0; +} + +/** + * ceph_new_inode - allocate a new inode in advance of an expected create + * @dir: parent directory for new inode + * @dentry: dentry that may eventually point to new inode + * @mode: mode of new inode + * @as_ctx: pointer to inherited security context + * + * Allocate a new inode in advance of an operation to create a new inode. + * This allocates the inode and sets up the acl_sec_ctx with appropriate + * info for the new inode. + * + * Returns a pointer to the new inode or an ERR_PTR. + */ +struct inode *ceph_new_inode(struct inode *dir, struct dentry *dentry, + umode_t *mode, struct ceph_acl_sec_ctx *as_ctx) +{ + int err; + struct inode *inode; + + inode = new_inode(dir->i_sb); + if (!inode) + return ERR_PTR(-ENOMEM); + + if (!S_ISLNK(*mode)) { + err = ceph_pre_init_acls(dir, mode, as_ctx); + if (err < 0) + goto out_err; + } + + inode->i_state = 0; + inode->i_mode = *mode; + + err = ceph_security_init_secctx(dentry, *mode, as_ctx); + if (err < 0) + goto out_err; + + /* + * We'll skip setting fscrypt context for snapshots, leaving that for + * the handle_reply(). + */ + if (ceph_snap(dir) != CEPH_SNAPDIR) { + err = ceph_fscrypt_prepare_context(dir, inode, as_ctx); + if (err) + goto out_err; + } + + return inode; +out_err: + iput(inode); + return ERR_PTR(err); +} + +void ceph_as_ctx_to_req(struct ceph_mds_request *req, + struct ceph_acl_sec_ctx *as_ctx) +{ + if (as_ctx->pagelist) { + req->r_pagelist = as_ctx->pagelist; + as_ctx->pagelist = NULL; + } + ceph_fscrypt_as_ctx_to_req(req, as_ctx); +} + +/** + * ceph_get_inode - find or create/hash a new inode + * @sb: superblock to search and allocate in + * @vino: vino to search for + * @newino: optional new inode to insert if one isn't found (may be NULL) + * + * Search for or insert a new inode into the hash for the given vino, and + * return a reference to it. If new is non-NULL, its reference is consumed. + */ +struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino, + struct inode *newino) +{ + struct inode *inode; + + if (ceph_vino_is_reserved(vino)) + return ERR_PTR(-EREMOTEIO); + + if (newino) { + inode = inode_insert5(newino, (unsigned long)vino.ino, + ceph_ino_compare, ceph_set_ino_cb, &vino); + if (inode != newino) + iput(newino); + } else { + inode = iget5_locked(sb, (unsigned long)vino.ino, + ceph_ino_compare, ceph_set_ino_cb, &vino); + } + + if (!inode) { + dout("No inode found for %llx.%llx\n", vino.ino, vino.snap); + return ERR_PTR(-ENOMEM); + } + + dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode), + ceph_vinop(inode), inode, !!(inode->i_state & I_NEW)); + return inode; +} + +/* + * get/constuct snapdir inode for a given directory + */ +struct inode *ceph_get_snapdir(struct inode *parent) +{ + struct ceph_vino vino = { + .ino = ceph_ino(parent), + .snap = CEPH_SNAPDIR, + }; + struct inode *inode = ceph_get_inode(parent->i_sb, vino, NULL); + struct ceph_inode_info *ci = ceph_inode(inode); + int ret = -ENOTDIR; + + if (IS_ERR(inode)) + return inode; + + if (!S_ISDIR(parent->i_mode)) { + pr_warn_once("bad snapdir parent type (mode=0%o)\n", + parent->i_mode); + goto err; + } + + if (!(inode->i_state & I_NEW) && !S_ISDIR(inode->i_mode)) { + pr_warn_once("bad snapdir inode type (mode=0%o)\n", + inode->i_mode); + goto err; + } + + inode->i_mode = parent->i_mode; + inode->i_uid = parent->i_uid; + inode->i_gid = parent->i_gid; + inode->i_mtime = parent->i_mtime; + inode_set_ctime_to_ts(inode, inode_get_ctime(parent)); + inode->i_atime = parent->i_atime; + ci->i_rbytes = 0; + ci->i_btime = ceph_inode(parent)->i_btime; + +#ifdef CONFIG_FS_ENCRYPTION + /* if encrypted, just borrow fscrypt_auth from parent */ + if (IS_ENCRYPTED(parent)) { + struct ceph_inode_info *pci = ceph_inode(parent); + + ci->fscrypt_auth = kmemdup(pci->fscrypt_auth, + pci->fscrypt_auth_len, + GFP_KERNEL); + if (ci->fscrypt_auth) { + inode->i_flags |= S_ENCRYPTED; + ci->fscrypt_auth_len = pci->fscrypt_auth_len; + } else { + dout("Failed to alloc snapdir fscrypt_auth\n"); + ret = -ENOMEM; + goto err; + } + } +#endif + if (inode->i_state & I_NEW) { + inode->i_op = &ceph_snapdir_iops; + inode->i_fop = &ceph_snapdir_fops; + ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ + unlock_new_inode(inode); + } + + return inode; +err: + if ((inode->i_state & I_NEW)) + discard_new_inode(inode); + else + iput(inode); + return ERR_PTR(ret); +} + +const struct inode_operations ceph_file_iops = { + .permission = ceph_permission, + .setattr = ceph_setattr, + .getattr = ceph_getattr, + .listxattr = ceph_listxattr, + .get_inode_acl = ceph_get_acl, + .set_acl = ceph_set_acl, +}; + + +/* + * We use a 'frag tree' to keep track of the MDS's directory fragments + * for a given inode (usually there is just a single fragment). We + * need to know when a child frag is delegated to a new MDS, or when + * it is flagged as replicated, so we can direct our requests + * accordingly. + */ + +/* + * find/create a frag in the tree + */ +static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci, + u32 f) +{ + struct rb_node **p; + struct rb_node *parent = NULL; + struct ceph_inode_frag *frag; + int c; + + p = &ci->i_fragtree.rb_node; + while (*p) { + parent = *p; + frag = rb_entry(parent, struct ceph_inode_frag, node); + c = ceph_frag_compare(f, frag->frag); + if (c < 0) + p = &(*p)->rb_left; + else if (c > 0) + p = &(*p)->rb_right; + else + return frag; + } + + frag = kmalloc(sizeof(*frag), GFP_NOFS); + if (!frag) + return ERR_PTR(-ENOMEM); + + frag->frag = f; + frag->split_by = 0; + frag->mds = -1; + frag->ndist = 0; + + rb_link_node(&frag->node, parent, p); + rb_insert_color(&frag->node, &ci->i_fragtree); + + dout("get_or_create_frag added %llx.%llx frag %x\n", + ceph_vinop(&ci->netfs.inode), f); + return frag; +} + +/* + * find a specific frag @f + */ +struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f) +{ + struct rb_node *n = ci->i_fragtree.rb_node; + + while (n) { + struct ceph_inode_frag *frag = + rb_entry(n, struct ceph_inode_frag, node); + int c = ceph_frag_compare(f, frag->frag); + if (c < 0) + n = n->rb_left; + else if (c > 0) + n = n->rb_right; + else + return frag; + } + return NULL; +} + +/* + * Choose frag containing the given value @v. If @pfrag is + * specified, copy the frag delegation info to the caller if + * it is present. + */ +static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v, + struct ceph_inode_frag *pfrag, int *found) +{ + u32 t = ceph_frag_make(0, 0); + struct ceph_inode_frag *frag; + unsigned nway, i; + u32 n; + + if (found) + *found = 0; + + while (1) { + WARN_ON(!ceph_frag_contains_value(t, v)); + frag = __ceph_find_frag(ci, t); + if (!frag) + break; /* t is a leaf */ + if (frag->split_by == 0) { + if (pfrag) + memcpy(pfrag, frag, sizeof(*pfrag)); + if (found) + *found = 1; + break; + } + + /* choose child */ + nway = 1 << frag->split_by; + dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t, + frag->split_by, nway); + for (i = 0; i < nway; i++) { + n = ceph_frag_make_child(t, frag->split_by, i); + if (ceph_frag_contains_value(n, v)) { + t = n; + break; + } + } + BUG_ON(i == nway); + } + dout("choose_frag(%x) = %x\n", v, t); + + return t; +} + +u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, + struct ceph_inode_frag *pfrag, int *found) +{ + u32 ret; + mutex_lock(&ci->i_fragtree_mutex); + ret = __ceph_choose_frag(ci, v, pfrag, found); + mutex_unlock(&ci->i_fragtree_mutex); + return ret; +} + +/* + * Process dirfrag (delegation) info from the mds. Include leaf + * fragment in tree ONLY if ndist > 0. Otherwise, only + * branches/splits are included in i_fragtree) + */ +static int ceph_fill_dirfrag(struct inode *inode, + struct ceph_mds_reply_dirfrag *dirinfo) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_inode_frag *frag; + u32 id = le32_to_cpu(dirinfo->frag); + int mds = le32_to_cpu(dirinfo->auth); + int ndist = le32_to_cpu(dirinfo->ndist); + int diri_auth = -1; + int i; + int err = 0; + + spin_lock(&ci->i_ceph_lock); + if (ci->i_auth_cap) + diri_auth = ci->i_auth_cap->mds; + spin_unlock(&ci->i_ceph_lock); + + if (mds == -1) /* CDIR_AUTH_PARENT */ + mds = diri_auth; + + mutex_lock(&ci->i_fragtree_mutex); + if (ndist == 0 && mds == diri_auth) { + /* no delegation info needed. */ + frag = __ceph_find_frag(ci, id); + if (!frag) + goto out; + if (frag->split_by == 0) { + /* tree leaf, remove */ + dout("fill_dirfrag removed %llx.%llx frag %x" + " (no ref)\n", ceph_vinop(inode), id); + rb_erase(&frag->node, &ci->i_fragtree); + kfree(frag); + } else { + /* tree branch, keep and clear */ + dout("fill_dirfrag cleared %llx.%llx frag %x" + " referral\n", ceph_vinop(inode), id); + frag->mds = -1; + frag->ndist = 0; + } + goto out; + } + + + /* find/add this frag to store mds delegation info */ + frag = __get_or_create_frag(ci, id); + if (IS_ERR(frag)) { + /* this is not the end of the world; we can continue + with bad/inaccurate delegation info */ + pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n", + ceph_vinop(inode), le32_to_cpu(dirinfo->frag)); + err = -ENOMEM; + goto out; + } + + frag->mds = mds; + frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP); + for (i = 0; i < frag->ndist; i++) + frag->dist[i] = le32_to_cpu(dirinfo->dist[i]); + dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n", + ceph_vinop(inode), frag->frag, frag->ndist); + +out: + mutex_unlock(&ci->i_fragtree_mutex); + return err; +} + +static int frag_tree_split_cmp(const void *l, const void *r) +{ + struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l; + struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r; + return ceph_frag_compare(le32_to_cpu(ls->frag), + le32_to_cpu(rs->frag)); +} + +static bool is_frag_child(u32 f, struct ceph_inode_frag *frag) +{ + if (!frag) + return f == ceph_frag_make(0, 0); + if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by) + return false; + return ceph_frag_contains_value(frag->frag, ceph_frag_value(f)); +} + +static int ceph_fill_fragtree(struct inode *inode, + struct ceph_frag_tree_head *fragtree, + struct ceph_mds_reply_dirfrag *dirinfo) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_inode_frag *frag, *prev_frag = NULL; + struct rb_node *rb_node; + unsigned i, split_by, nsplits; + u32 id; + bool update = false; + + mutex_lock(&ci->i_fragtree_mutex); + nsplits = le32_to_cpu(fragtree->nsplits); + if (nsplits != ci->i_fragtree_nsplits) { + update = true; + } else if (nsplits) { + i = get_random_u32_below(nsplits); + id = le32_to_cpu(fragtree->splits[i].frag); + if (!__ceph_find_frag(ci, id)) + update = true; + } else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) { + rb_node = rb_first(&ci->i_fragtree); + frag = rb_entry(rb_node, struct ceph_inode_frag, node); + if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node)) + update = true; + } + if (!update && dirinfo) { + id = le32_to_cpu(dirinfo->frag); + if (id != __ceph_choose_frag(ci, id, NULL, NULL)) + update = true; + } + if (!update) + goto out_unlock; + + if (nsplits > 1) { + sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]), + frag_tree_split_cmp, NULL); + } + + dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode)); + rb_node = rb_first(&ci->i_fragtree); + for (i = 0; i < nsplits; i++) { + id = le32_to_cpu(fragtree->splits[i].frag); + split_by = le32_to_cpu(fragtree->splits[i].by); + if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) { + pr_err("fill_fragtree %llx.%llx invalid split %d/%u, " + "frag %x split by %d\n", ceph_vinop(inode), + i, nsplits, id, split_by); + continue; + } + frag = NULL; + while (rb_node) { + frag = rb_entry(rb_node, struct ceph_inode_frag, node); + if (ceph_frag_compare(frag->frag, id) >= 0) { + if (frag->frag != id) + frag = NULL; + else + rb_node = rb_next(rb_node); + break; + } + rb_node = rb_next(rb_node); + /* delete stale split/leaf node */ + if (frag->split_by > 0 || + !is_frag_child(frag->frag, prev_frag)) { + rb_erase(&frag->node, &ci->i_fragtree); + if (frag->split_by > 0) + ci->i_fragtree_nsplits--; + kfree(frag); + } + frag = NULL; + } + if (!frag) { + frag = __get_or_create_frag(ci, id); + if (IS_ERR(frag)) + continue; + } + if (frag->split_by == 0) + ci->i_fragtree_nsplits++; + frag->split_by = split_by; + dout(" frag %x split by %d\n", frag->frag, frag->split_by); + prev_frag = frag; + } + while (rb_node) { + frag = rb_entry(rb_node, struct ceph_inode_frag, node); + rb_node = rb_next(rb_node); + /* delete stale split/leaf node */ + if (frag->split_by > 0 || + !is_frag_child(frag->frag, prev_frag)) { + rb_erase(&frag->node, &ci->i_fragtree); + if (frag->split_by > 0) + ci->i_fragtree_nsplits--; + kfree(frag); + } + } +out_unlock: + mutex_unlock(&ci->i_fragtree_mutex); + return 0; +} + +/* + * initialize a newly allocated inode. + */ +struct inode *ceph_alloc_inode(struct super_block *sb) +{ + struct ceph_inode_info *ci; + int i; + + ci = alloc_inode_sb(sb, ceph_inode_cachep, GFP_NOFS); + if (!ci) + return NULL; + + dout("alloc_inode %p\n", &ci->netfs.inode); + + /* Set parameters for the netfs library */ + netfs_inode_init(&ci->netfs, &ceph_netfs_ops); + + spin_lock_init(&ci->i_ceph_lock); + + ci->i_version = 0; + ci->i_inline_version = 0; + ci->i_time_warp_seq = 0; + ci->i_ceph_flags = 0; + atomic64_set(&ci->i_ordered_count, 1); + atomic64_set(&ci->i_release_count, 1); + atomic64_set(&ci->i_complete_seq[0], 0); + atomic64_set(&ci->i_complete_seq[1], 0); + ci->i_symlink = NULL; + + ci->i_max_bytes = 0; + ci->i_max_files = 0; + + memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout)); + memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout)); + RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL); + + ci->i_fragtree = RB_ROOT; + mutex_init(&ci->i_fragtree_mutex); + + ci->i_xattrs.blob = NULL; + ci->i_xattrs.prealloc_blob = NULL; + ci->i_xattrs.dirty = false; + ci->i_xattrs.index = RB_ROOT; + ci->i_xattrs.count = 0; + ci->i_xattrs.names_size = 0; + ci->i_xattrs.vals_size = 0; + ci->i_xattrs.version = 0; + ci->i_xattrs.index_version = 0; + + ci->i_caps = RB_ROOT; + ci->i_auth_cap = NULL; + ci->i_dirty_caps = 0; + ci->i_flushing_caps = 0; + INIT_LIST_HEAD(&ci->i_dirty_item); + INIT_LIST_HEAD(&ci->i_flushing_item); + ci->i_prealloc_cap_flush = NULL; + INIT_LIST_HEAD(&ci->i_cap_flush_list); + init_waitqueue_head(&ci->i_cap_wq); + ci->i_hold_caps_max = 0; + INIT_LIST_HEAD(&ci->i_cap_delay_list); + INIT_LIST_HEAD(&ci->i_cap_snaps); + ci->i_head_snapc = NULL; + ci->i_snap_caps = 0; + + ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ; + for (i = 0; i < CEPH_FILE_MODE_BITS; i++) + ci->i_nr_by_mode[i] = 0; + + mutex_init(&ci->i_truncate_mutex); + ci->i_truncate_seq = 0; + ci->i_truncate_size = 0; + ci->i_truncate_pending = 0; + ci->i_truncate_pagecache_size = 0; + + ci->i_max_size = 0; + ci->i_reported_size = 0; + ci->i_wanted_max_size = 0; + ci->i_requested_max_size = 0; + + ci->i_pin_ref = 0; + ci->i_rd_ref = 0; + ci->i_rdcache_ref = 0; + ci->i_wr_ref = 0; + ci->i_wb_ref = 0; + ci->i_fx_ref = 0; + ci->i_wrbuffer_ref = 0; + ci->i_wrbuffer_ref_head = 0; + atomic_set(&ci->i_filelock_ref, 0); + atomic_set(&ci->i_shared_gen, 1); + ci->i_rdcache_gen = 0; + ci->i_rdcache_revoking = 0; + + INIT_LIST_HEAD(&ci->i_unsafe_dirops); + INIT_LIST_HEAD(&ci->i_unsafe_iops); + spin_lock_init(&ci->i_unsafe_lock); + + ci->i_snap_realm = NULL; + INIT_LIST_HEAD(&ci->i_snap_realm_item); + INIT_LIST_HEAD(&ci->i_snap_flush_item); + + INIT_WORK(&ci->i_work, ceph_inode_work); + ci->i_work_mask = 0; + memset(&ci->i_btime, '\0', sizeof(ci->i_btime)); +#ifdef CONFIG_FS_ENCRYPTION + ci->fscrypt_auth = NULL; + ci->fscrypt_auth_len = 0; +#endif + return &ci->netfs.inode; +} + +void ceph_free_inode(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + kfree(ci->i_symlink); +#ifdef CONFIG_FS_ENCRYPTION + kfree(ci->fscrypt_auth); +#endif + fscrypt_free_inode(inode); + kmem_cache_free(ceph_inode_cachep, ci); +} + +void ceph_evict_inode(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); + struct ceph_inode_frag *frag; + struct rb_node *n; + + dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode)); + + percpu_counter_dec(&mdsc->metric.total_inodes); + + truncate_inode_pages_final(&inode->i_data); + if (inode->i_state & I_PINNING_FSCACHE_WB) + ceph_fscache_unuse_cookie(inode, true); + clear_inode(inode); + + ceph_fscache_unregister_inode_cookie(ci); + fscrypt_put_encryption_info(inode); + + __ceph_remove_caps(ci); + + if (__ceph_has_quota(ci, QUOTA_GET_ANY)) + ceph_adjust_quota_realms_count(inode, false); + + /* + * we may still have a snap_realm reference if there are stray + * caps in i_snap_caps. + */ + if (ci->i_snap_realm) { + if (ceph_snap(inode) == CEPH_NOSNAP) { + dout(" dropping residual ref to snap realm %p\n", + ci->i_snap_realm); + ceph_change_snap_realm(inode, NULL); + } else { + ceph_put_snapid_map(mdsc, ci->i_snapid_map); + ci->i_snap_realm = NULL; + } + } + + while ((n = rb_first(&ci->i_fragtree)) != NULL) { + frag = rb_entry(n, struct ceph_inode_frag, node); + rb_erase(n, &ci->i_fragtree); + kfree(frag); + } + ci->i_fragtree_nsplits = 0; + + __ceph_destroy_xattrs(ci); + if (ci->i_xattrs.blob) + ceph_buffer_put(ci->i_xattrs.blob); + if (ci->i_xattrs.prealloc_blob) + ceph_buffer_put(ci->i_xattrs.prealloc_blob); + + ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns)); + ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns)); +} + +static inline blkcnt_t calc_inode_blocks(u64 size) +{ + return (size + (1<<9) - 1) >> 9; +} + +/* + * Helpers to fill in size, ctime, mtime, and atime. We have to be + * careful because either the client or MDS may have more up to date + * info, depending on which capabilities are held, and whether + * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime + * and size are monotonically increasing, except when utimes() or + * truncate() increments the corresponding _seq values.) + */ +int ceph_fill_file_size(struct inode *inode, int issued, + u32 truncate_seq, u64 truncate_size, u64 size) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int queue_trunc = 0; + loff_t isize = i_size_read(inode); + + if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 || + (truncate_seq == ci->i_truncate_seq && size > isize)) { + dout("size %lld -> %llu\n", isize, size); + if (size > 0 && S_ISDIR(inode->i_mode)) { + pr_err("fill_file_size non-zero size for directory\n"); + size = 0; + } + i_size_write(inode, size); + inode->i_blocks = calc_inode_blocks(size); + /* + * If we're expanding, then we should be able to just update + * the existing cookie. + */ + if (size > isize) + ceph_fscache_update(inode); + ci->i_reported_size = size; + if (truncate_seq != ci->i_truncate_seq) { + dout("%s truncate_seq %u -> %u\n", __func__, + ci->i_truncate_seq, truncate_seq); + ci->i_truncate_seq = truncate_seq; + + /* the MDS should have revoked these caps */ + WARN_ON_ONCE(issued & (CEPH_CAP_FILE_RD | + CEPH_CAP_FILE_LAZYIO)); + /* + * If we hold relevant caps, or in the case where we're + * not the only client referencing this file and we + * don't hold those caps, then we need to check whether + * the file is either opened or mmaped + */ + if ((issued & (CEPH_CAP_FILE_CACHE| + CEPH_CAP_FILE_BUFFER)) || + mapping_mapped(inode->i_mapping) || + __ceph_is_file_opened(ci)) { + ci->i_truncate_pending++; + queue_trunc = 1; + } + } + } + + /* + * It's possible that the new sizes of the two consecutive + * size truncations will be in the same fscrypt last block, + * and we need to truncate the corresponding page caches + * anyway. + */ + if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0) { + dout("%s truncate_size %lld -> %llu, encrypted %d\n", __func__, + ci->i_truncate_size, truncate_size, !!IS_ENCRYPTED(inode)); + + ci->i_truncate_size = truncate_size; + + if (IS_ENCRYPTED(inode)) { + dout("%s truncate_pagecache_size %lld -> %llu\n", + __func__, ci->i_truncate_pagecache_size, size); + ci->i_truncate_pagecache_size = size; + } else { + ci->i_truncate_pagecache_size = truncate_size; + } + } + return queue_trunc; +} + +void ceph_fill_file_time(struct inode *inode, int issued, + u64 time_warp_seq, struct timespec64 *ctime, + struct timespec64 *mtime, struct timespec64 *atime) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct timespec64 ictime = inode_get_ctime(inode); + int warn = 0; + + if (issued & (CEPH_CAP_FILE_EXCL| + CEPH_CAP_FILE_WR| + CEPH_CAP_FILE_BUFFER| + CEPH_CAP_AUTH_EXCL| + CEPH_CAP_XATTR_EXCL)) { + if (ci->i_version == 0 || + timespec64_compare(ctime, &ictime) > 0) { + dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n", + ictime.tv_sec, ictime.tv_nsec, + ctime->tv_sec, ctime->tv_nsec); + inode_set_ctime_to_ts(inode, *ctime); + } + if (ci->i_version == 0 || + ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) { + /* the MDS did a utimes() */ + dout("mtime %lld.%09ld -> %lld.%09ld " + "tw %d -> %d\n", + inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, + mtime->tv_sec, mtime->tv_nsec, + ci->i_time_warp_seq, (int)time_warp_seq); + + inode->i_mtime = *mtime; + inode->i_atime = *atime; + ci->i_time_warp_seq = time_warp_seq; + } else if (time_warp_seq == ci->i_time_warp_seq) { + /* nobody did utimes(); take the max */ + if (timespec64_compare(mtime, &inode->i_mtime) > 0) { + dout("mtime %lld.%09ld -> %lld.%09ld inc\n", + inode->i_mtime.tv_sec, + inode->i_mtime.tv_nsec, + mtime->tv_sec, mtime->tv_nsec); + inode->i_mtime = *mtime; + } + if (timespec64_compare(atime, &inode->i_atime) > 0) { + dout("atime %lld.%09ld -> %lld.%09ld inc\n", + inode->i_atime.tv_sec, + inode->i_atime.tv_nsec, + atime->tv_sec, atime->tv_nsec); + inode->i_atime = *atime; + } + } else if (issued & CEPH_CAP_FILE_EXCL) { + /* we did a utimes(); ignore mds values */ + } else { + warn = 1; + } + } else { + /* we have no write|excl caps; whatever the MDS says is true */ + if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) { + inode_set_ctime_to_ts(inode, *ctime); + inode->i_mtime = *mtime; + inode->i_atime = *atime; + ci->i_time_warp_seq = time_warp_seq; + } else { + warn = 1; + } + } + if (warn) /* time_warp_seq shouldn't go backwards */ + dout("%p mds time_warp_seq %llu < %u\n", + inode, time_warp_seq, ci->i_time_warp_seq); +} + +#if IS_ENABLED(CONFIG_FS_ENCRYPTION) +static int decode_encrypted_symlink(const char *encsym, int enclen, u8 **decsym) +{ + int declen; + u8 *sym; + + sym = kmalloc(enclen + 1, GFP_NOFS); + if (!sym) + return -ENOMEM; + + declen = ceph_base64_decode(encsym, enclen, sym); + if (declen < 0) { + pr_err("%s: can't decode symlink (%d). Content: %.*s\n", + __func__, declen, enclen, encsym); + kfree(sym); + return -EIO; + } + sym[declen + 1] = '\0'; + *decsym = sym; + return declen; +} +#else +static int decode_encrypted_symlink(const char *encsym, int symlen, u8 **decsym) +{ + return -EOPNOTSUPP; +} +#endif + +/* + * Populate an inode based on info from mds. May be called on new or + * existing inodes. + */ +int ceph_fill_inode(struct inode *inode, struct page *locked_page, + struct ceph_mds_reply_info_in *iinfo, + struct ceph_mds_reply_dirfrag *dirinfo, + struct ceph_mds_session *session, int cap_fmode, + struct ceph_cap_reservation *caps_reservation) +{ + struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); + struct ceph_mds_reply_inode *info = iinfo->in; + struct ceph_inode_info *ci = ceph_inode(inode); + int issued, new_issued, info_caps; + struct timespec64 mtime, atime, ctime; + struct ceph_buffer *xattr_blob = NULL; + struct ceph_buffer *old_blob = NULL; + struct ceph_string *pool_ns = NULL; + struct ceph_cap *new_cap = NULL; + int err = 0; + bool wake = false; + bool queue_trunc = false; + bool new_version = false; + bool fill_inline = false; + umode_t mode = le32_to_cpu(info->mode); + dev_t rdev = le32_to_cpu(info->rdev); + + lockdep_assert_held(&mdsc->snap_rwsem); + + dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__, + inode, ceph_vinop(inode), le64_to_cpu(info->version), + ci->i_version); + + /* Once I_NEW is cleared, we can't change type or dev numbers */ + if (inode->i_state & I_NEW) { + inode->i_mode = mode; + } else { + if (inode_wrong_type(inode, mode)) { + pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n", + ceph_vinop(inode), inode->i_mode, mode); + return -ESTALE; + } + + if ((S_ISCHR(mode) || S_ISBLK(mode)) && inode->i_rdev != rdev) { + pr_warn_once("dev inode rdev changed! (ino %llx.%llx is %u:%u, mds says %u:%u)\n", + ceph_vinop(inode), MAJOR(inode->i_rdev), + MINOR(inode->i_rdev), MAJOR(rdev), + MINOR(rdev)); + return -ESTALE; + } + } + + info_caps = le32_to_cpu(info->cap.caps); + + /* prealloc new cap struct */ + if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) { + new_cap = ceph_get_cap(mdsc, caps_reservation); + if (!new_cap) + return -ENOMEM; + } + + /* + * prealloc xattr data, if it looks like we'll need it. only + * if len > 4 (meaning there are actually xattrs; the first 4 + * bytes are the xattr count). + */ + if (iinfo->xattr_len > 4) { + xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS); + if (!xattr_blob) + pr_err("%s ENOMEM xattr blob %d bytes\n", __func__, + iinfo->xattr_len); + } + + if (iinfo->pool_ns_len > 0) + pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data, + iinfo->pool_ns_len); + + if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map) + ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode)); + + spin_lock(&ci->i_ceph_lock); + + /* + * provided version will be odd if inode value is projected, + * even if stable. skip the update if we have newer stable + * info (ours>=theirs, e.g. due to racing mds replies), unless + * we are getting projected (unstable) info (in which case the + * version is odd, and we want ours>theirs). + * us them + * 2 2 skip + * 3 2 skip + * 3 3 update + */ + if (ci->i_version == 0 || + ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && + le64_to_cpu(info->version) > (ci->i_version & ~1))) + new_version = true; + + /* Update change_attribute */ + inode_set_max_iversion_raw(inode, iinfo->change_attr); + + __ceph_caps_issued(ci, &issued); + issued |= __ceph_caps_dirty(ci); + new_issued = ~issued & info_caps; + + __ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files); + +#ifdef CONFIG_FS_ENCRYPTION + if (iinfo->fscrypt_auth_len && + ((inode->i_state & I_NEW) || (ci->fscrypt_auth_len == 0))) { + kfree(ci->fscrypt_auth); + ci->fscrypt_auth_len = iinfo->fscrypt_auth_len; + ci->fscrypt_auth = iinfo->fscrypt_auth; + iinfo->fscrypt_auth = NULL; + iinfo->fscrypt_auth_len = 0; + inode_set_flags(inode, S_ENCRYPTED, S_ENCRYPTED); + } +#endif + + if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) && + (issued & CEPH_CAP_AUTH_EXCL) == 0) { + inode->i_mode = mode; + inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid)); + inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid)); + dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, + from_kuid(&init_user_ns, inode->i_uid), + from_kgid(&init_user_ns, inode->i_gid)); + ceph_decode_timespec64(&ci->i_btime, &iinfo->btime); + ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime); + } + + /* directories have fl_stripe_unit set to zero */ + if (IS_ENCRYPTED(inode)) + inode->i_blkbits = CEPH_FSCRYPT_BLOCK_SHIFT; + else if (le32_to_cpu(info->layout.fl_stripe_unit)) + inode->i_blkbits = + fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1; + else + inode->i_blkbits = CEPH_BLOCK_SHIFT; + + if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) && + (issued & CEPH_CAP_LINK_EXCL) == 0) + set_nlink(inode, le32_to_cpu(info->nlink)); + + if (new_version || (new_issued & CEPH_CAP_ANY_RD)) { + /* be careful with mtime, atime, size */ + ceph_decode_timespec64(&atime, &info->atime); + ceph_decode_timespec64(&mtime, &info->mtime); + ceph_decode_timespec64(&ctime, &info->ctime); + ceph_fill_file_time(inode, issued, + le32_to_cpu(info->time_warp_seq), + &ctime, &mtime, &atime); + } + + if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) { + ci->i_files = le64_to_cpu(info->files); + ci->i_subdirs = le64_to_cpu(info->subdirs); + } + + if (new_version || + (new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) { + u64 size = le64_to_cpu(info->size); + s64 old_pool = ci->i_layout.pool_id; + struct ceph_string *old_ns; + + ceph_file_layout_from_legacy(&ci->i_layout, &info->layout); + old_ns = rcu_dereference_protected(ci->i_layout.pool_ns, + lockdep_is_held(&ci->i_ceph_lock)); + rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns); + + if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns) + ci->i_ceph_flags &= ~CEPH_I_POOL_PERM; + + pool_ns = old_ns; + + if (IS_ENCRYPTED(inode) && size && + iinfo->fscrypt_file_len == sizeof(__le64)) { + u64 fsize = __le64_to_cpu(*(__le64 *)iinfo->fscrypt_file); + + if (size == round_up(fsize, CEPH_FSCRYPT_BLOCK_SIZE)) { + size = fsize; + } else { + pr_warn("fscrypt size mismatch: size=%llu fscrypt_file=%llu, discarding fscrypt_file size.\n", + info->size, size); + } + } + + queue_trunc = ceph_fill_file_size(inode, issued, + le32_to_cpu(info->truncate_seq), + le64_to_cpu(info->truncate_size), + size); + /* only update max_size on auth cap */ + if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && + ci->i_max_size != le64_to_cpu(info->max_size)) { + dout("max_size %lld -> %llu\n", ci->i_max_size, + le64_to_cpu(info->max_size)); + ci->i_max_size = le64_to_cpu(info->max_size); + } + } + + /* layout and rstat are not tracked by capability, update them if + * the inode info is from auth mds */ + if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) { + if (S_ISDIR(inode->i_mode)) { + ci->i_dir_layout = iinfo->dir_layout; + ci->i_rbytes = le64_to_cpu(info->rbytes); + ci->i_rfiles = le64_to_cpu(info->rfiles); + ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); + ci->i_dir_pin = iinfo->dir_pin; + ci->i_rsnaps = iinfo->rsnaps; + ceph_decode_timespec64(&ci->i_rctime, &info->rctime); + } + } + + /* xattrs */ + /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */ + if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) && + le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) { + if (ci->i_xattrs.blob) + old_blob = ci->i_xattrs.blob; + ci->i_xattrs.blob = xattr_blob; + if (xattr_blob) + memcpy(ci->i_xattrs.blob->vec.iov_base, + iinfo->xattr_data, iinfo->xattr_len); + ci->i_xattrs.version = le64_to_cpu(info->xattr_version); + ceph_forget_all_cached_acls(inode); + ceph_security_invalidate_secctx(inode); + xattr_blob = NULL; + } + + /* finally update i_version */ + if (le64_to_cpu(info->version) > ci->i_version) + ci->i_version = le64_to_cpu(info->version); + + inode->i_mapping->a_ops = &ceph_aops; + + switch (inode->i_mode & S_IFMT) { + case S_IFIFO: + case S_IFBLK: + case S_IFCHR: + case S_IFSOCK: + inode->i_blkbits = PAGE_SHIFT; + init_special_inode(inode, inode->i_mode, rdev); + inode->i_op = &ceph_file_iops; + break; + case S_IFREG: + inode->i_op = &ceph_file_iops; + inode->i_fop = &ceph_file_fops; + break; + case S_IFLNK: + if (!ci->i_symlink) { + u32 symlen = iinfo->symlink_len; + char *sym; + + spin_unlock(&ci->i_ceph_lock); + + if (IS_ENCRYPTED(inode)) { + if (symlen != i_size_read(inode)) + pr_err("%s %llx.%llx BAD symlink size %lld\n", + __func__, ceph_vinop(inode), + i_size_read(inode)); + + err = decode_encrypted_symlink(iinfo->symlink, + symlen, (u8 **)&sym); + if (err < 0) { + pr_err("%s decoding encrypted symlink failed: %d\n", + __func__, err); + goto out; + } + symlen = err; + i_size_write(inode, symlen); + inode->i_blocks = calc_inode_blocks(symlen); + } else { + if (symlen != i_size_read(inode)) { + pr_err("%s %llx.%llx BAD symlink size %lld\n", + __func__, ceph_vinop(inode), + i_size_read(inode)); + i_size_write(inode, symlen); + inode->i_blocks = calc_inode_blocks(symlen); + } + + err = -ENOMEM; + sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS); + if (!sym) + goto out; + } + + spin_lock(&ci->i_ceph_lock); + if (!ci->i_symlink) + ci->i_symlink = sym; + else + kfree(sym); /* lost a race */ + } + + if (IS_ENCRYPTED(inode)) { + /* + * Encrypted symlinks need to be decrypted before we can + * cache their targets in i_link. Don't touch it here. + */ + inode->i_op = &ceph_encrypted_symlink_iops; + } else { + inode->i_link = ci->i_symlink; + inode->i_op = &ceph_symlink_iops; + } + break; + case S_IFDIR: + inode->i_op = &ceph_dir_iops; + inode->i_fop = &ceph_dir_fops; + break; + default: + pr_err("%s %llx.%llx BAD mode 0%o\n", __func__, + ceph_vinop(inode), inode->i_mode); + } + + /* were we issued a capability? */ + if (info_caps) { + if (ceph_snap(inode) == CEPH_NOSNAP) { + ceph_add_cap(inode, session, + le64_to_cpu(info->cap.cap_id), + info_caps, + le32_to_cpu(info->cap.wanted), + le32_to_cpu(info->cap.seq), + le32_to_cpu(info->cap.mseq), + le64_to_cpu(info->cap.realm), + info->cap.flags, &new_cap); + + /* set dir completion flag? */ + if (S_ISDIR(inode->i_mode) && + ci->i_files == 0 && ci->i_subdirs == 0 && + (info_caps & CEPH_CAP_FILE_SHARED) && + (issued & CEPH_CAP_FILE_EXCL) == 0 && + !__ceph_dir_is_complete(ci)) { + dout(" marking %p complete (empty)\n", inode); + i_size_write(inode, 0); + __ceph_dir_set_complete(ci, + atomic64_read(&ci->i_release_count), + atomic64_read(&ci->i_ordered_count)); + } + + wake = true; + } else { + dout(" %p got snap_caps %s\n", inode, + ceph_cap_string(info_caps)); + ci->i_snap_caps |= info_caps; + } + } + + if (iinfo->inline_version > 0 && + iinfo->inline_version >= ci->i_inline_version) { + int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO; + ci->i_inline_version = iinfo->inline_version; + if (ceph_has_inline_data(ci) && + (locked_page || (info_caps & cache_caps))) + fill_inline = true; + } + + if (cap_fmode >= 0) { + if (!info_caps) + pr_warn("mds issued no caps on %llx.%llx\n", + ceph_vinop(inode)); + __ceph_touch_fmode(ci, mdsc, cap_fmode); + } + + spin_unlock(&ci->i_ceph_lock); + + ceph_fscache_register_inode_cookie(inode); + + if (fill_inline) + ceph_fill_inline_data(inode, locked_page, + iinfo->inline_data, iinfo->inline_len); + + if (wake) + wake_up_all(&ci->i_cap_wq); + + /* queue truncate if we saw i_size decrease */ + if (queue_trunc) + ceph_queue_vmtruncate(inode); + + /* populate frag tree */ + if (S_ISDIR(inode->i_mode)) + ceph_fill_fragtree(inode, &info->fragtree, dirinfo); + + /* update delegation info? */ + if (dirinfo) + ceph_fill_dirfrag(inode, dirinfo); + + err = 0; +out: + if (new_cap) + ceph_put_cap(mdsc, new_cap); + ceph_buffer_put(old_blob); + ceph_buffer_put(xattr_blob); + ceph_put_string(pool_ns); + return err; +} + +/* + * caller should hold session s_mutex and dentry->d_lock. + */ +static void __update_dentry_lease(struct inode *dir, struct dentry *dentry, + struct ceph_mds_reply_lease *lease, + struct ceph_mds_session *session, + unsigned long from_time, + struct ceph_mds_session **old_lease_session) +{ + struct ceph_dentry_info *di = ceph_dentry(dentry); + unsigned mask = le16_to_cpu(lease->mask); + long unsigned duration = le32_to_cpu(lease->duration_ms); + long unsigned ttl = from_time + (duration * HZ) / 1000; + long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; + + dout("update_dentry_lease %p duration %lu ms ttl %lu\n", + dentry, duration, ttl); + + /* only track leases on regular dentries */ + if (ceph_snap(dir) != CEPH_NOSNAP) + return; + + if (mask & CEPH_LEASE_PRIMARY_LINK) + di->flags |= CEPH_DENTRY_PRIMARY_LINK; + else + di->flags &= ~CEPH_DENTRY_PRIMARY_LINK; + + di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen); + if (!(mask & CEPH_LEASE_VALID)) { + __ceph_dentry_dir_lease_touch(di); + return; + } + + if (di->lease_gen == atomic_read(&session->s_cap_gen) && + time_before(ttl, di->time)) + return; /* we already have a newer lease. */ + + if (di->lease_session && di->lease_session != session) { + *old_lease_session = di->lease_session; + di->lease_session = NULL; + } + + if (!di->lease_session) + di->lease_session = ceph_get_mds_session(session); + di->lease_gen = atomic_read(&session->s_cap_gen); + di->lease_seq = le32_to_cpu(lease->seq); + di->lease_renew_after = half_ttl; + di->lease_renew_from = 0; + di->time = ttl; + + __ceph_dentry_lease_touch(di); +} + +static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry, + struct ceph_mds_reply_lease *lease, + struct ceph_mds_session *session, + unsigned long from_time) +{ + struct ceph_mds_session *old_lease_session = NULL; + spin_lock(&dentry->d_lock); + __update_dentry_lease(dir, dentry, lease, session, from_time, + &old_lease_session); + spin_unlock(&dentry->d_lock); + ceph_put_mds_session(old_lease_session); +} + +/* + * update dentry lease without having parent inode locked + */ +static void update_dentry_lease_careful(struct dentry *dentry, + struct ceph_mds_reply_lease *lease, + struct ceph_mds_session *session, + unsigned long from_time, + char *dname, u32 dname_len, + struct ceph_vino *pdvino, + struct ceph_vino *ptvino) + +{ + struct inode *dir; + struct ceph_mds_session *old_lease_session = NULL; + + spin_lock(&dentry->d_lock); + /* make sure dentry's name matches target */ + if (dentry->d_name.len != dname_len || + memcmp(dentry->d_name.name, dname, dname_len)) + goto out_unlock; + + dir = d_inode(dentry->d_parent); + /* make sure parent matches dvino */ + if (!ceph_ino_compare(dir, pdvino)) + goto out_unlock; + + /* make sure dentry's inode matches target. NULL ptvino means that + * we expect a negative dentry */ + if (ptvino) { + if (d_really_is_negative(dentry)) + goto out_unlock; + if (!ceph_ino_compare(d_inode(dentry), ptvino)) + goto out_unlock; + } else { + if (d_really_is_positive(dentry)) + goto out_unlock; + } + + __update_dentry_lease(dir, dentry, lease, session, + from_time, &old_lease_session); +out_unlock: + spin_unlock(&dentry->d_lock); + ceph_put_mds_session(old_lease_session); +} + +/* + * splice a dentry to an inode. + * caller must hold directory i_rwsem for this to be safe. + */ +static int splice_dentry(struct dentry **pdn, struct inode *in) +{ + struct dentry *dn = *pdn; + struct dentry *realdn; + + BUG_ON(d_inode(dn)); + + if (S_ISDIR(in->i_mode)) { + /* If inode is directory, d_splice_alias() below will remove + * 'realdn' from its origin parent. We need to ensure that + * origin parent's readdir cache will not reference 'realdn' + */ + realdn = d_find_any_alias(in); + if (realdn) { + struct ceph_dentry_info *di = ceph_dentry(realdn); + spin_lock(&realdn->d_lock); + + realdn->d_op->d_prune(realdn); + + di->time = jiffies; + di->lease_shared_gen = 0; + di->offset = 0; + + spin_unlock(&realdn->d_lock); + dput(realdn); + } + } + + /* dn must be unhashed */ + if (!d_unhashed(dn)) + d_drop(dn); + realdn = d_splice_alias(in, dn); + if (IS_ERR(realdn)) { + pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n", + PTR_ERR(realdn), dn, in, ceph_vinop(in)); + return PTR_ERR(realdn); + } + + if (realdn) { + dout("dn %p (%d) spliced with %p (%d) " + "inode %p ino %llx.%llx\n", + dn, d_count(dn), + realdn, d_count(realdn), + d_inode(realdn), ceph_vinop(d_inode(realdn))); + dput(dn); + *pdn = realdn; + } else { + BUG_ON(!ceph_dentry(dn)); + dout("dn %p attached to %p ino %llx.%llx\n", + dn, d_inode(dn), ceph_vinop(d_inode(dn))); + } + return 0; +} + +/* + * Incorporate results into the local cache. This is either just + * one inode, or a directory, dentry, and possibly linked-to inode (e.g., + * after a lookup). + * + * A reply may contain + * a directory inode along with a dentry. + * and/or a target inode + * + * Called with snap_rwsem (read). + */ +int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req) +{ + struct ceph_mds_session *session = req->r_session; + struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; + struct inode *in = NULL; + struct ceph_vino tvino, dvino; + struct ceph_fs_client *fsc = ceph_sb_to_client(sb); + int err = 0; + + dout("fill_trace %p is_dentry %d is_target %d\n", req, + rinfo->head->is_dentry, rinfo->head->is_target); + + if (!rinfo->head->is_target && !rinfo->head->is_dentry) { + dout("fill_trace reply is empty!\n"); + if (rinfo->head->result == 0 && req->r_parent) + ceph_invalidate_dir_request(req); + return 0; + } + + if (rinfo->head->is_dentry) { + struct inode *dir = req->r_parent; + + if (dir) { + err = ceph_fill_inode(dir, NULL, &rinfo->diri, + rinfo->dirfrag, session, -1, + &req->r_caps_reservation); + if (err < 0) + goto done; + } else { + WARN_ON_ONCE(1); + } + + if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME && + test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) && + !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { + bool is_nokey = false; + struct qstr dname; + struct dentry *dn, *parent; + struct fscrypt_str oname = FSTR_INIT(NULL, 0); + struct ceph_fname fname = { .dir = dir, + .name = rinfo->dname, + .ctext = rinfo->altname, + .name_len = rinfo->dname_len, + .ctext_len = rinfo->altname_len }; + + BUG_ON(!rinfo->head->is_target); + BUG_ON(req->r_dentry); + + parent = d_find_any_alias(dir); + BUG_ON(!parent); + + err = ceph_fname_alloc_buffer(dir, &oname); + if (err < 0) { + dput(parent); + goto done; + } + + err = ceph_fname_to_usr(&fname, NULL, &oname, &is_nokey); + if (err < 0) { + dput(parent); + ceph_fname_free_buffer(dir, &oname); + goto done; + } + dname.name = oname.name; + dname.len = oname.len; + dname.hash = full_name_hash(parent, dname.name, dname.len); + tvino.ino = le64_to_cpu(rinfo->targeti.in->ino); + tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid); +retry_lookup: + dn = d_lookup(parent, &dname); + dout("d_lookup on parent=%p name=%.*s got %p\n", + parent, dname.len, dname.name, dn); + + if (!dn) { + dn = d_alloc(parent, &dname); + dout("d_alloc %p '%.*s' = %p\n", parent, + dname.len, dname.name, dn); + if (!dn) { + dput(parent); + ceph_fname_free_buffer(dir, &oname); + err = -ENOMEM; + goto done; + } + if (is_nokey) { + spin_lock(&dn->d_lock); + dn->d_flags |= DCACHE_NOKEY_NAME; + spin_unlock(&dn->d_lock); + } + err = 0; + } else if (d_really_is_positive(dn) && + (ceph_ino(d_inode(dn)) != tvino.ino || + ceph_snap(d_inode(dn)) != tvino.snap)) { + dout(" dn %p points to wrong inode %p\n", + dn, d_inode(dn)); + ceph_dir_clear_ordered(dir); + d_delete(dn); + dput(dn); + goto retry_lookup; + } + ceph_fname_free_buffer(dir, &oname); + + req->r_dentry = dn; + dput(parent); + } + } + + if (rinfo->head->is_target) { + /* Should be filled in by handle_reply */ + BUG_ON(!req->r_target_inode); + + in = req->r_target_inode; + err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti, + NULL, session, + (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) && + !test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && + rinfo->head->result == 0) ? req->r_fmode : -1, + &req->r_caps_reservation); + if (err < 0) { + pr_err("ceph_fill_inode badness %p %llx.%llx\n", + in, ceph_vinop(in)); + req->r_target_inode = NULL; + if (in->i_state & I_NEW) + discard_new_inode(in); + else + iput(in); + goto done; + } + if (in->i_state & I_NEW) + unlock_new_inode(in); + } + + /* + * ignore null lease/binding on snapdir ENOENT, or else we + * will have trouble splicing in the virtual snapdir later + */ + if (rinfo->head->is_dentry && + !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) && + test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) && + (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, + fsc->mount_options->snapdir_name, + req->r_dentry->d_name.len))) { + /* + * lookup link rename : null -> possibly existing inode + * mknod symlink mkdir : null -> new inode + * unlink : linked -> null + */ + struct inode *dir = req->r_parent; + struct dentry *dn = req->r_dentry; + bool have_dir_cap, have_lease; + + BUG_ON(!dn); + BUG_ON(!dir); + BUG_ON(d_inode(dn->d_parent) != dir); + + dvino.ino = le64_to_cpu(rinfo->diri.in->ino); + dvino.snap = le64_to_cpu(rinfo->diri.in->snapid); + + BUG_ON(ceph_ino(dir) != dvino.ino); + BUG_ON(ceph_snap(dir) != dvino.snap); + + /* do we have a lease on the whole dir? */ + have_dir_cap = + (le32_to_cpu(rinfo->diri.in->cap.caps) & + CEPH_CAP_FILE_SHARED); + + /* do we have a dn lease? */ + have_lease = have_dir_cap || + le32_to_cpu(rinfo->dlease->duration_ms); + if (!have_lease) + dout("fill_trace no dentry lease or dir cap\n"); + + /* rename? */ + if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { + struct inode *olddir = req->r_old_dentry_dir; + BUG_ON(!olddir); + + dout(" src %p '%pd' dst %p '%pd'\n", + req->r_old_dentry, + req->r_old_dentry, + dn, dn); + dout("fill_trace doing d_move %p -> %p\n", + req->r_old_dentry, dn); + + /* d_move screws up sibling dentries' offsets */ + ceph_dir_clear_ordered(dir); + ceph_dir_clear_ordered(olddir); + + d_move(req->r_old_dentry, dn); + dout(" src %p '%pd' dst %p '%pd'\n", + req->r_old_dentry, + req->r_old_dentry, + dn, dn); + + /* ensure target dentry is invalidated, despite + rehashing bug in vfs_rename_dir */ + ceph_invalidate_dentry_lease(dn); + + dout("dn %p gets new offset %lld\n", req->r_old_dentry, + ceph_dentry(req->r_old_dentry)->offset); + + /* swap r_dentry and r_old_dentry in case that + * splice_dentry() gets called later. This is safe + * because no other place will use them */ + req->r_dentry = req->r_old_dentry; + req->r_old_dentry = dn; + dn = req->r_dentry; + } + + /* null dentry? */ + if (!rinfo->head->is_target) { + dout("fill_trace null dentry\n"); + if (d_really_is_positive(dn)) { + dout("d_delete %p\n", dn); + ceph_dir_clear_ordered(dir); + d_delete(dn); + } else if (have_lease) { + if (d_unhashed(dn)) + d_add(dn, NULL); + } + + if (!d_unhashed(dn) && have_lease) + update_dentry_lease(dir, dn, + rinfo->dlease, session, + req->r_request_started); + goto done; + } + + /* attach proper inode */ + if (d_really_is_negative(dn)) { + ceph_dir_clear_ordered(dir); + ihold(in); + err = splice_dentry(&req->r_dentry, in); + if (err < 0) + goto done; + dn = req->r_dentry; /* may have spliced */ + } else if (d_really_is_positive(dn) && d_inode(dn) != in) { + dout(" %p links to %p %llx.%llx, not %llx.%llx\n", + dn, d_inode(dn), ceph_vinop(d_inode(dn)), + ceph_vinop(in)); + d_invalidate(dn); + have_lease = false; + } + + if (have_lease) { + update_dentry_lease(dir, dn, + rinfo->dlease, session, + req->r_request_started); + } + dout(" final dn %p\n", dn); + } else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP || + req->r_op == CEPH_MDS_OP_MKSNAP) && + test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) && + !test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { + struct inode *dir = req->r_parent; + + /* fill out a snapdir LOOKUPSNAP dentry */ + BUG_ON(!dir); + BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR); + BUG_ON(!req->r_dentry); + dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry); + ceph_dir_clear_ordered(dir); + ihold(in); + err = splice_dentry(&req->r_dentry, in); + if (err < 0) + goto done; + } else if (rinfo->head->is_dentry && req->r_dentry) { + /* parent inode is not locked, be carefull */ + struct ceph_vino *ptvino = NULL; + dvino.ino = le64_to_cpu(rinfo->diri.in->ino); + dvino.snap = le64_to_cpu(rinfo->diri.in->snapid); + if (rinfo->head->is_target) { + tvino.ino = le64_to_cpu(rinfo->targeti.in->ino); + tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid); + ptvino = &tvino; + } + update_dentry_lease_careful(req->r_dentry, rinfo->dlease, + session, req->r_request_started, + rinfo->dname, rinfo->dname_len, + &dvino, ptvino); + } +done: + dout("fill_trace done err=%d\n", err); + return err; +} + +/* + * Prepopulate our cache with readdir results, leases, etc. + */ +static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req, + struct ceph_mds_session *session) +{ + struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; + int i, err = 0; + + for (i = 0; i < rinfo->dir_nr; i++) { + struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; + struct ceph_vino vino; + struct inode *in; + int rc; + + vino.ino = le64_to_cpu(rde->inode.in->ino); + vino.snap = le64_to_cpu(rde->inode.in->snapid); + + in = ceph_get_inode(req->r_dentry->d_sb, vino, NULL); + if (IS_ERR(in)) { + err = PTR_ERR(in); + dout("new_inode badness got %d\n", err); + continue; + } + rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session, + -1, &req->r_caps_reservation); + if (rc < 0) { + pr_err("ceph_fill_inode badness on %p got %d\n", + in, rc); + err = rc; + if (in->i_state & I_NEW) { + ihold(in); + discard_new_inode(in); + } + } else if (in->i_state & I_NEW) { + unlock_new_inode(in); + } + + iput(in); + } + + return err; +} + +void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl) +{ + if (ctl->page) { + kunmap(ctl->page); + put_page(ctl->page); + ctl->page = NULL; + } +} + +static int fill_readdir_cache(struct inode *dir, struct dentry *dn, + struct ceph_readdir_cache_control *ctl, + struct ceph_mds_request *req) +{ + struct ceph_inode_info *ci = ceph_inode(dir); + unsigned nsize = PAGE_SIZE / sizeof(struct dentry*); + unsigned idx = ctl->index % nsize; + pgoff_t pgoff = ctl->index / nsize; + + if (!ctl->page || pgoff != page_index(ctl->page)) { + ceph_readdir_cache_release(ctl); + if (idx == 0) + ctl->page = grab_cache_page(&dir->i_data, pgoff); + else + ctl->page = find_lock_page(&dir->i_data, pgoff); + if (!ctl->page) { + ctl->index = -1; + return idx == 0 ? -ENOMEM : 0; + } + /* reading/filling the cache are serialized by + * i_rwsem, no need to use page lock */ + unlock_page(ctl->page); + ctl->dentries = kmap(ctl->page); + if (idx == 0) + memset(ctl->dentries, 0, PAGE_SIZE); + } + + if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) && + req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) { + dout("readdir cache dn %p idx %d\n", dn, ctl->index); + ctl->dentries[idx] = dn; + ctl->index++; + } else { + dout("disable readdir cache\n"); + ctl->index = -1; + } + return 0; +} + +int ceph_readdir_prepopulate(struct ceph_mds_request *req, + struct ceph_mds_session *session) +{ + struct dentry *parent = req->r_dentry; + struct inode *inode = d_inode(parent); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; + struct qstr dname; + struct dentry *dn; + struct inode *in; + int err = 0, skipped = 0, ret, i; + u32 frag = le32_to_cpu(req->r_args.readdir.frag); + u32 last_hash = 0; + u32 fpos_offset; + struct ceph_readdir_cache_control cache_ctl = {}; + + if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) + return readdir_prepopulate_inodes_only(req, session); + + if (rinfo->hash_order) { + if (req->r_path2) { + last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash, + req->r_path2, + strlen(req->r_path2)); + last_hash = ceph_frag_value(last_hash); + } else if (rinfo->offset_hash) { + /* mds understands offset_hash */ + WARN_ON_ONCE(req->r_readdir_offset != 2); + last_hash = le32_to_cpu(req->r_args.readdir.offset_hash); + } + } + + if (rinfo->dir_dir && + le32_to_cpu(rinfo->dir_dir->frag) != frag) { + dout("readdir_prepopulate got new frag %x -> %x\n", + frag, le32_to_cpu(rinfo->dir_dir->frag)); + frag = le32_to_cpu(rinfo->dir_dir->frag); + if (!rinfo->hash_order) + req->r_readdir_offset = 2; + } + + if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { + dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", + rinfo->dir_nr, parent); + } else { + dout("readdir_prepopulate %d items under dn %p\n", + rinfo->dir_nr, parent); + if (rinfo->dir_dir) + ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir); + + if (ceph_frag_is_leftmost(frag) && + req->r_readdir_offset == 2 && + !(rinfo->hash_order && last_hash)) { + /* note dir version at start of readdir so we can + * tell if any dentries get dropped */ + req->r_dir_release_cnt = + atomic64_read(&ci->i_release_count); + req->r_dir_ordered_cnt = + atomic64_read(&ci->i_ordered_count); + req->r_readdir_cache_idx = 0; + } + } + + cache_ctl.index = req->r_readdir_cache_idx; + fpos_offset = req->r_readdir_offset; + + /* FIXME: release caps/leases if error occurs */ + for (i = 0; i < rinfo->dir_nr; i++) { + struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; + struct ceph_vino tvino; + + dname.name = rde->name; + dname.len = rde->name_len; + dname.hash = full_name_hash(parent, dname.name, dname.len); + + tvino.ino = le64_to_cpu(rde->inode.in->ino); + tvino.snap = le64_to_cpu(rde->inode.in->snapid); + + if (rinfo->hash_order) { + u32 hash = ceph_frag_value(rde->raw_hash); + if (hash != last_hash) + fpos_offset = 2; + last_hash = hash; + rde->offset = ceph_make_fpos(hash, fpos_offset++, true); + } else { + rde->offset = ceph_make_fpos(frag, fpos_offset++, false); + } + +retry_lookup: + dn = d_lookup(parent, &dname); + dout("d_lookup on parent=%p name=%.*s got %p\n", + parent, dname.len, dname.name, dn); + + if (!dn) { + dn = d_alloc(parent, &dname); + dout("d_alloc %p '%.*s' = %p\n", parent, + dname.len, dname.name, dn); + if (!dn) { + dout("d_alloc badness\n"); + err = -ENOMEM; + goto out; + } + if (rde->is_nokey) { + spin_lock(&dn->d_lock); + dn->d_flags |= DCACHE_NOKEY_NAME; + spin_unlock(&dn->d_lock); + } + } else if (d_really_is_positive(dn) && + (ceph_ino(d_inode(dn)) != tvino.ino || + ceph_snap(d_inode(dn)) != tvino.snap)) { + struct ceph_dentry_info *di = ceph_dentry(dn); + dout(" dn %p points to wrong inode %p\n", + dn, d_inode(dn)); + + spin_lock(&dn->d_lock); + if (di->offset > 0 && + di->lease_shared_gen == + atomic_read(&ci->i_shared_gen)) { + __ceph_dir_clear_ordered(ci); + di->offset = 0; + } + spin_unlock(&dn->d_lock); + + d_delete(dn); + dput(dn); + goto retry_lookup; + } + + /* inode */ + if (d_really_is_positive(dn)) { + in = d_inode(dn); + } else { + in = ceph_get_inode(parent->d_sb, tvino, NULL); + if (IS_ERR(in)) { + dout("new_inode badness\n"); + d_drop(dn); + dput(dn); + err = PTR_ERR(in); + goto out; + } + } + + ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session, + -1, &req->r_caps_reservation); + if (ret < 0) { + pr_err("ceph_fill_inode badness on %p\n", in); + if (d_really_is_negative(dn)) { + if (in->i_state & I_NEW) { + ihold(in); + discard_new_inode(in); + } + iput(in); + } + d_drop(dn); + err = ret; + goto next_item; + } + if (in->i_state & I_NEW) + unlock_new_inode(in); + + if (d_really_is_negative(dn)) { + if (ceph_security_xattr_deadlock(in)) { + dout(" skip splicing dn %p to inode %p" + " (security xattr deadlock)\n", dn, in); + iput(in); + skipped++; + goto next_item; + } + + err = splice_dentry(&dn, in); + if (err < 0) + goto next_item; + } + + ceph_dentry(dn)->offset = rde->offset; + + update_dentry_lease(d_inode(parent), dn, + rde->lease, req->r_session, + req->r_request_started); + + if (err == 0 && skipped == 0 && cache_ctl.index >= 0) { + ret = fill_readdir_cache(d_inode(parent), dn, + &cache_ctl, req); + if (ret < 0) + err = ret; + } +next_item: + dput(dn); + } +out: + if (err == 0 && skipped == 0) { + set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags); + req->r_readdir_cache_idx = cache_ctl.index; + } + ceph_readdir_cache_release(&cache_ctl); + dout("readdir_prepopulate done\n"); + return err; +} + +bool ceph_inode_set_size(struct inode *inode, loff_t size) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + bool ret; + + spin_lock(&ci->i_ceph_lock); + dout("set_size %p %llu -> %llu\n", inode, i_size_read(inode), size); + i_size_write(inode, size); + ceph_fscache_update(inode); + inode->i_blocks = calc_inode_blocks(size); + + ret = __ceph_should_report_size(ci); + + spin_unlock(&ci->i_ceph_lock); + + return ret; +} + +void ceph_queue_inode_work(struct inode *inode, int work_bit) +{ + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + struct ceph_inode_info *ci = ceph_inode(inode); + set_bit(work_bit, &ci->i_work_mask); + + ihold(inode); + if (queue_work(fsc->inode_wq, &ci->i_work)) { + dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask); + } else { + dout("queue_inode_work %p already queued, mask=%lx\n", + inode, ci->i_work_mask); + iput(inode); + } +} + +static void ceph_do_invalidate_pages(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + u32 orig_gen; + int check = 0; + + ceph_fscache_invalidate(inode, false); + + mutex_lock(&ci->i_truncate_mutex); + + if (ceph_inode_is_shutdown(inode)) { + pr_warn_ratelimited("%s: inode %llx.%llx is shut down\n", + __func__, ceph_vinop(inode)); + mapping_set_error(inode->i_mapping, -EIO); + truncate_pagecache(inode, 0); + mutex_unlock(&ci->i_truncate_mutex); + goto out; + } + + spin_lock(&ci->i_ceph_lock); + dout("invalidate_pages %p gen %d revoking %d\n", inode, + ci->i_rdcache_gen, ci->i_rdcache_revoking); + if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { + if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) + check = 1; + spin_unlock(&ci->i_ceph_lock); + mutex_unlock(&ci->i_truncate_mutex); + goto out; + } + orig_gen = ci->i_rdcache_gen; + spin_unlock(&ci->i_ceph_lock); + + if (invalidate_inode_pages2(inode->i_mapping) < 0) { + pr_err("invalidate_inode_pages2 %llx.%llx failed\n", + ceph_vinop(inode)); + } + + spin_lock(&ci->i_ceph_lock); + if (orig_gen == ci->i_rdcache_gen && + orig_gen == ci->i_rdcache_revoking) { + dout("invalidate_pages %p gen %d successful\n", inode, + ci->i_rdcache_gen); + ci->i_rdcache_revoking--; + check = 1; + } else { + dout("invalidate_pages %p gen %d raced, now %d revoking %d\n", + inode, orig_gen, ci->i_rdcache_gen, + ci->i_rdcache_revoking); + if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) + check = 1; + } + spin_unlock(&ci->i_ceph_lock); + mutex_unlock(&ci->i_truncate_mutex); +out: + if (check) + ceph_check_caps(ci, 0); +} + +/* + * Make sure any pending truncation is applied before doing anything + * that may depend on it. + */ +void __ceph_do_pending_vmtruncate(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + u64 to; + int wrbuffer_refs, finish = 0; + + mutex_lock(&ci->i_truncate_mutex); +retry: + spin_lock(&ci->i_ceph_lock); + if (ci->i_truncate_pending == 0) { + dout("%s %p none pending\n", __func__, inode); + spin_unlock(&ci->i_ceph_lock); + mutex_unlock(&ci->i_truncate_mutex); + return; + } + + /* + * make sure any dirty snapped pages are flushed before we + * possibly truncate them.. so write AND block! + */ + if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { + spin_unlock(&ci->i_ceph_lock); + dout("%s %p flushing snaps first\n", __func__, inode); + filemap_write_and_wait_range(&inode->i_data, 0, + inode->i_sb->s_maxbytes); + goto retry; + } + + /* there should be no reader or writer */ + WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref); + + to = ci->i_truncate_pagecache_size; + wrbuffer_refs = ci->i_wrbuffer_ref; + dout("%s %p (%d) to %lld\n", __func__, inode, + ci->i_truncate_pending, to); + spin_unlock(&ci->i_ceph_lock); + + ceph_fscache_resize(inode, to); + truncate_pagecache(inode, to); + + spin_lock(&ci->i_ceph_lock); + if (to == ci->i_truncate_pagecache_size) { + ci->i_truncate_pending = 0; + finish = 1; + } + spin_unlock(&ci->i_ceph_lock); + if (!finish) + goto retry; + + mutex_unlock(&ci->i_truncate_mutex); + + if (wrbuffer_refs == 0) + ceph_check_caps(ci, 0); + + wake_up_all(&ci->i_cap_wq); +} + +static void ceph_inode_work(struct work_struct *work) +{ + struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, + i_work); + struct inode *inode = &ci->netfs.inode; + + if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) { + dout("writeback %p\n", inode); + filemap_fdatawrite(&inode->i_data); + } + if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask)) + ceph_do_invalidate_pages(inode); + + if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask)) + __ceph_do_pending_vmtruncate(inode); + + if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask)) + ceph_check_caps(ci, 0); + + if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask)) + ceph_flush_snaps(ci, NULL); + + iput(inode); +} + +static const char *ceph_encrypted_get_link(struct dentry *dentry, + struct inode *inode, + struct delayed_call *done) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + + if (!dentry) + return ERR_PTR(-ECHILD); + + return fscrypt_get_symlink(inode, ci->i_symlink, i_size_read(inode), + done); +} + +static int ceph_encrypted_symlink_getattr(struct mnt_idmap *idmap, + const struct path *path, + struct kstat *stat, u32 request_mask, + unsigned int query_flags) +{ + int ret; + + ret = ceph_getattr(idmap, path, stat, request_mask, query_flags); + if (ret) + return ret; + return fscrypt_symlink_getattr(path, stat); +} + +/* + * symlinks + */ +static const struct inode_operations ceph_symlink_iops = { + .get_link = simple_get_link, + .setattr = ceph_setattr, + .getattr = ceph_getattr, + .listxattr = ceph_listxattr, +}; + +static const struct inode_operations ceph_encrypted_symlink_iops = { + .get_link = ceph_encrypted_get_link, + .setattr = ceph_setattr, + .getattr = ceph_encrypted_symlink_getattr, + .listxattr = ceph_listxattr, +}; + +/* + * Transfer the encrypted last block to the MDS and the MDS + * will help update it when truncating a smaller size. + * + * We don't support a PAGE_SIZE that is smaller than the + * CEPH_FSCRYPT_BLOCK_SIZE. + */ +static int fill_fscrypt_truncate(struct inode *inode, + struct ceph_mds_request *req, + struct iattr *attr) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + int boff = attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE; + loff_t pos, orig_pos = round_down(attr->ia_size, + CEPH_FSCRYPT_BLOCK_SIZE); + u64 block = orig_pos >> CEPH_FSCRYPT_BLOCK_SHIFT; + struct ceph_pagelist *pagelist = NULL; + struct kvec iov = {0}; + struct iov_iter iter; + struct page *page = NULL; + struct ceph_fscrypt_truncate_size_header header; + int retry_op = 0; + int len = CEPH_FSCRYPT_BLOCK_SIZE; + loff_t i_size = i_size_read(inode); + int got, ret, issued; + u64 objver; + + ret = __ceph_get_caps(inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got); + if (ret < 0) + return ret; + + issued = __ceph_caps_issued(ci, NULL); + + dout("%s size %lld -> %lld got cap refs on %s, issued %s\n", __func__, + i_size, attr->ia_size, ceph_cap_string(got), + ceph_cap_string(issued)); + + /* Try to writeback the dirty pagecaches */ + if (issued & (CEPH_CAP_FILE_BUFFER)) { + loff_t lend = orig_pos + CEPH_FSCRYPT_BLOCK_SHIFT - 1; + + ret = filemap_write_and_wait_range(inode->i_mapping, + orig_pos, lend); + if (ret < 0) + goto out; + } + + page = __page_cache_alloc(GFP_KERNEL); + if (page == NULL) { + ret = -ENOMEM; + goto out; + } + + pagelist = ceph_pagelist_alloc(GFP_KERNEL); + if (!pagelist) { + ret = -ENOMEM; + goto out; + } + + iov.iov_base = kmap_local_page(page); + iov.iov_len = len; + iov_iter_kvec(&iter, READ, &iov, 1, len); + + pos = orig_pos; + ret = __ceph_sync_read(inode, &pos, &iter, &retry_op, &objver); + if (ret < 0) + goto out; + + /* Insert the header first */ + header.ver = 1; + header.compat = 1; + header.change_attr = cpu_to_le64(inode_peek_iversion_raw(inode)); + + /* + * Always set the block_size to CEPH_FSCRYPT_BLOCK_SIZE, + * because in MDS it may need this to do the truncate. + */ + header.block_size = cpu_to_le32(CEPH_FSCRYPT_BLOCK_SIZE); + + /* + * If we hit a hole here, we should just skip filling + * the fscrypt for the request, because once the fscrypt + * is enabled, the file will be split into many blocks + * with the size of CEPH_FSCRYPT_BLOCK_SIZE, if there + * has a hole, the hole size should be multiple of block + * size. + * + * If the Rados object doesn't exist, it will be set to 0. + */ + if (!objver) { + dout("%s hit hole, ppos %lld < size %lld\n", __func__, + pos, i_size); + + header.data_len = cpu_to_le32(8 + 8 + 4); + header.file_offset = 0; + ret = 0; + } else { + header.data_len = cpu_to_le32(8 + 8 + 4 + CEPH_FSCRYPT_BLOCK_SIZE); + header.file_offset = cpu_to_le64(orig_pos); + + dout("%s encrypt block boff/bsize %d/%lu\n", __func__, + boff, CEPH_FSCRYPT_BLOCK_SIZE); + + /* truncate and zero out the extra contents for the last block */ + memset(iov.iov_base + boff, 0, PAGE_SIZE - boff); + + /* encrypt the last block */ + ret = ceph_fscrypt_encrypt_block_inplace(inode, page, + CEPH_FSCRYPT_BLOCK_SIZE, + 0, block, + GFP_KERNEL); + if (ret) + goto out; + } + + /* Insert the header */ + ret = ceph_pagelist_append(pagelist, &header, sizeof(header)); + if (ret) + goto out; + + if (header.block_size) { + /* Append the last block contents to pagelist */ + ret = ceph_pagelist_append(pagelist, iov.iov_base, + CEPH_FSCRYPT_BLOCK_SIZE); + if (ret) + goto out; + } + req->r_pagelist = pagelist; +out: + dout("%s %p size dropping cap refs on %s\n", __func__, + inode, ceph_cap_string(got)); + ceph_put_cap_refs(ci, got); + if (iov.iov_base) + kunmap_local(iov.iov_base); + if (page) + __free_pages(page, 0); + if (ret && pagelist) + ceph_pagelist_release(pagelist); + return ret; +} + +int __ceph_setattr(struct inode *inode, struct iattr *attr, + struct ceph_iattr *cia) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + unsigned int ia_valid = attr->ia_valid; + struct ceph_mds_request *req; + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + struct ceph_cap_flush *prealloc_cf; + loff_t isize = i_size_read(inode); + int issued; + int release = 0, dirtied = 0; + int mask = 0; + int err = 0; + int inode_dirty_flags = 0; + bool lock_snap_rwsem = false; + bool fill_fscrypt; + int truncate_retry = 20; /* The RMW will take around 50ms */ + +retry: + prealloc_cf = ceph_alloc_cap_flush(); + if (!prealloc_cf) + return -ENOMEM; + + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, + USE_AUTH_MDS); + if (IS_ERR(req)) { + ceph_free_cap_flush(prealloc_cf); + return PTR_ERR(req); + } + + fill_fscrypt = false; + spin_lock(&ci->i_ceph_lock); + issued = __ceph_caps_issued(ci, NULL); + + if (!ci->i_head_snapc && + (issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) { + lock_snap_rwsem = true; + if (!down_read_trylock(&mdsc->snap_rwsem)) { + spin_unlock(&ci->i_ceph_lock); + down_read(&mdsc->snap_rwsem); + spin_lock(&ci->i_ceph_lock); + issued = __ceph_caps_issued(ci, NULL); + } + } + + dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); +#if IS_ENABLED(CONFIG_FS_ENCRYPTION) + if (cia && cia->fscrypt_auth) { + u32 len = ceph_fscrypt_auth_len(cia->fscrypt_auth); + + if (len > sizeof(*cia->fscrypt_auth)) { + err = -EINVAL; + spin_unlock(&ci->i_ceph_lock); + goto out; + } + + dout("setattr %llx:%llx fscrypt_auth len %u to %u)\n", + ceph_vinop(inode), ci->fscrypt_auth_len, len); + + /* It should never be re-set once set */ + WARN_ON_ONCE(ci->fscrypt_auth); + + if (issued & CEPH_CAP_AUTH_EXCL) { + dirtied |= CEPH_CAP_AUTH_EXCL; + kfree(ci->fscrypt_auth); + ci->fscrypt_auth = (u8 *)cia->fscrypt_auth; + ci->fscrypt_auth_len = len; + } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || + ci->fscrypt_auth_len != len || + memcmp(ci->fscrypt_auth, cia->fscrypt_auth, len)) { + req->r_fscrypt_auth = cia->fscrypt_auth; + mask |= CEPH_SETATTR_FSCRYPT_AUTH; + release |= CEPH_CAP_AUTH_SHARED; + } + cia->fscrypt_auth = NULL; + } +#else + if (cia && cia->fscrypt_auth) { + err = -EINVAL; + spin_unlock(&ci->i_ceph_lock); + goto out; + } +#endif /* CONFIG_FS_ENCRYPTION */ + + if (ia_valid & ATTR_UID) { + dout("setattr %p uid %d -> %d\n", inode, + from_kuid(&init_user_ns, inode->i_uid), + from_kuid(&init_user_ns, attr->ia_uid)); + if (issued & CEPH_CAP_AUTH_EXCL) { + inode->i_uid = attr->ia_uid; + dirtied |= CEPH_CAP_AUTH_EXCL; + } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || + !uid_eq(attr->ia_uid, inode->i_uid)) { + req->r_args.setattr.uid = cpu_to_le32( + from_kuid(&init_user_ns, attr->ia_uid)); + mask |= CEPH_SETATTR_UID; + release |= CEPH_CAP_AUTH_SHARED; + } + } + if (ia_valid & ATTR_GID) { + dout("setattr %p gid %d -> %d\n", inode, + from_kgid(&init_user_ns, inode->i_gid), + from_kgid(&init_user_ns, attr->ia_gid)); + if (issued & CEPH_CAP_AUTH_EXCL) { + inode->i_gid = attr->ia_gid; + dirtied |= CEPH_CAP_AUTH_EXCL; + } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || + !gid_eq(attr->ia_gid, inode->i_gid)) { + req->r_args.setattr.gid = cpu_to_le32( + from_kgid(&init_user_ns, attr->ia_gid)); + mask |= CEPH_SETATTR_GID; + release |= CEPH_CAP_AUTH_SHARED; + } + } + if (ia_valid & ATTR_MODE) { + dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, + attr->ia_mode); + if (issued & CEPH_CAP_AUTH_EXCL) { + inode->i_mode = attr->ia_mode; + dirtied |= CEPH_CAP_AUTH_EXCL; + } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || + attr->ia_mode != inode->i_mode) { + inode->i_mode = attr->ia_mode; + req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); + mask |= CEPH_SETATTR_MODE; + release |= CEPH_CAP_AUTH_SHARED; + } + } + + if (ia_valid & ATTR_ATIME) { + dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode, + inode->i_atime.tv_sec, inode->i_atime.tv_nsec, + attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); + if (issued & CEPH_CAP_FILE_EXCL) { + ci->i_time_warp_seq++; + inode->i_atime = attr->ia_atime; + dirtied |= CEPH_CAP_FILE_EXCL; + } else if ((issued & CEPH_CAP_FILE_WR) && + timespec64_compare(&inode->i_atime, + &attr->ia_atime) < 0) { + inode->i_atime = attr->ia_atime; + dirtied |= CEPH_CAP_FILE_WR; + } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || + !timespec64_equal(&inode->i_atime, &attr->ia_atime)) { + ceph_encode_timespec64(&req->r_args.setattr.atime, + &attr->ia_atime); + mask |= CEPH_SETATTR_ATIME; + release |= CEPH_CAP_FILE_SHARED | + CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; + } + } + if (ia_valid & ATTR_SIZE) { + dout("setattr %p size %lld -> %lld\n", inode, isize, attr->ia_size); + /* + * Only when the new size is smaller and not aligned to + * CEPH_FSCRYPT_BLOCK_SIZE will the RMW is needed. + */ + if (IS_ENCRYPTED(inode) && attr->ia_size < isize && + (attr->ia_size % CEPH_FSCRYPT_BLOCK_SIZE)) { + mask |= CEPH_SETATTR_SIZE; + release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL | + CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; + set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags); + mask |= CEPH_SETATTR_FSCRYPT_FILE; + req->r_args.setattr.size = + cpu_to_le64(round_up(attr->ia_size, + CEPH_FSCRYPT_BLOCK_SIZE)); + req->r_args.setattr.old_size = + cpu_to_le64(round_up(isize, + CEPH_FSCRYPT_BLOCK_SIZE)); + req->r_fscrypt_file = attr->ia_size; + fill_fscrypt = true; + } else if ((issued & CEPH_CAP_FILE_EXCL) && attr->ia_size >= isize) { + if (attr->ia_size > isize) { + i_size_write(inode, attr->ia_size); + inode->i_blocks = calc_inode_blocks(attr->ia_size); + ci->i_reported_size = attr->ia_size; + dirtied |= CEPH_CAP_FILE_EXCL; + ia_valid |= ATTR_MTIME; + } + } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || + attr->ia_size != isize) { + mask |= CEPH_SETATTR_SIZE; + release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL | + CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; + if (IS_ENCRYPTED(inode) && attr->ia_size) { + set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags); + mask |= CEPH_SETATTR_FSCRYPT_FILE; + req->r_args.setattr.size = + cpu_to_le64(round_up(attr->ia_size, + CEPH_FSCRYPT_BLOCK_SIZE)); + req->r_args.setattr.old_size = + cpu_to_le64(round_up(isize, + CEPH_FSCRYPT_BLOCK_SIZE)); + req->r_fscrypt_file = attr->ia_size; + } else { + req->r_args.setattr.size = cpu_to_le64(attr->ia_size); + req->r_args.setattr.old_size = cpu_to_le64(isize); + req->r_fscrypt_file = 0; + } + } + } + if (ia_valid & ATTR_MTIME) { + dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode, + inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, + attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); + if (issued & CEPH_CAP_FILE_EXCL) { + ci->i_time_warp_seq++; + inode->i_mtime = attr->ia_mtime; + dirtied |= CEPH_CAP_FILE_EXCL; + } else if ((issued & CEPH_CAP_FILE_WR) && + timespec64_compare(&inode->i_mtime, + &attr->ia_mtime) < 0) { + inode->i_mtime = attr->ia_mtime; + dirtied |= CEPH_CAP_FILE_WR; + } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || + !timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) { + ceph_encode_timespec64(&req->r_args.setattr.mtime, + &attr->ia_mtime); + mask |= CEPH_SETATTR_MTIME; + release |= CEPH_CAP_FILE_SHARED | + CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR; + } + } + + /* these do nothing */ + if (ia_valid & ATTR_CTIME) { + bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| + ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; + dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode, + inode_get_ctime(inode).tv_sec, + inode_get_ctime(inode).tv_nsec, + attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, + only ? "ctime only" : "ignored"); + if (only) { + /* + * if kernel wants to dirty ctime but nothing else, + * we need to choose a cap to dirty under, or do + * a almost-no-op setattr + */ + if (issued & CEPH_CAP_AUTH_EXCL) + dirtied |= CEPH_CAP_AUTH_EXCL; + else if (issued & CEPH_CAP_FILE_EXCL) + dirtied |= CEPH_CAP_FILE_EXCL; + else if (issued & CEPH_CAP_XATTR_EXCL) + dirtied |= CEPH_CAP_XATTR_EXCL; + else + mask |= CEPH_SETATTR_CTIME; + } + } + if (ia_valid & ATTR_FILE) + dout("setattr %p ATTR_FILE ... hrm!\n", inode); + + if (dirtied) { + inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied, + &prealloc_cf); + inode_set_ctime_to_ts(inode, attr->ia_ctime); + inode_inc_iversion_raw(inode); + } + + release &= issued; + spin_unlock(&ci->i_ceph_lock); + if (lock_snap_rwsem) { + up_read(&mdsc->snap_rwsem); + lock_snap_rwsem = false; + } + + if (inode_dirty_flags) + __mark_inode_dirty(inode, inode_dirty_flags); + + if (mask) { + req->r_inode = inode; + ihold(inode); + req->r_inode_drop = release; + req->r_args.setattr.mask = cpu_to_le32(mask); + req->r_num_caps = 1; + req->r_stamp = attr->ia_ctime; + if (fill_fscrypt) { + err = fill_fscrypt_truncate(inode, req, attr); + if (err) + goto out; + } + + /* + * The truncate request will return -EAGAIN when the + * last block has been updated just before the MDS + * successfully gets the xlock for the FILE lock. To + * avoid corrupting the file contents we need to retry + * it. + */ + err = ceph_mdsc_do_request(mdsc, NULL, req); + if (err == -EAGAIN && truncate_retry--) { + dout("setattr %p result=%d (%s locally, %d remote), retry it!\n", + inode, err, ceph_cap_string(dirtied), mask); + ceph_mdsc_put_request(req); + ceph_free_cap_flush(prealloc_cf); + goto retry; + } + } +out: + dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, + ceph_cap_string(dirtied), mask); + + ceph_mdsc_put_request(req); + ceph_free_cap_flush(prealloc_cf); + + if (err >= 0 && (mask & CEPH_SETATTR_SIZE)) + __ceph_do_pending_vmtruncate(inode); + + return err; +} + +/* + * setattr + */ +int ceph_setattr(struct mnt_idmap *idmap, struct dentry *dentry, + struct iattr *attr) +{ + struct inode *inode = d_inode(dentry); + struct ceph_fs_client *fsc = ceph_inode_to_client(inode); + int err; + + if (ceph_snap(inode) != CEPH_NOSNAP) + return -EROFS; + + if (ceph_inode_is_shutdown(inode)) + return -ESTALE; + + err = fscrypt_prepare_setattr(dentry, attr); + if (err) + return err; + + err = setattr_prepare(&nop_mnt_idmap, dentry, attr); + if (err != 0) + return err; + + if ((attr->ia_valid & ATTR_SIZE) && + attr->ia_size > max(i_size_read(inode), fsc->max_file_size)) + return -EFBIG; + + if ((attr->ia_valid & ATTR_SIZE) && + ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size)) + return -EDQUOT; + + err = __ceph_setattr(inode, attr, NULL); + + if (err >= 0 && (attr->ia_valid & ATTR_MODE)) + err = posix_acl_chmod(&nop_mnt_idmap, dentry, attr->ia_mode); + + return err; +} + +int ceph_try_to_choose_auth_mds(struct inode *inode, int mask) +{ + int issued = ceph_caps_issued(ceph_inode(inode)); + + /* + * If any 'x' caps is issued we can just choose the auth MDS + * instead of the random replica MDSes. Because only when the + * Locker is in LOCK_EXEC state will the loner client could + * get the 'x' caps. And if we send the getattr requests to + * any replica MDS it must auth pin and tries to rdlock from + * the auth MDS, and then the auth MDS need to do the Locker + * state transition to LOCK_SYNC. And after that the lock state + * will change back. + * + * This cost much when doing the Locker state transition and + * usually will need to revoke caps from clients. + * + * And for the 'Xs' caps for getxattr we will also choose the + * auth MDS, because the MDS side code is buggy due to setxattr + * won't notify the replica MDSes when the values changed and + * the replica MDS will return the old values. Though we will + * fix it in MDS code, but this still makes sense for old ceph. + */ + if (((mask & CEPH_CAP_ANY_SHARED) && (issued & CEPH_CAP_ANY_EXCL)) + || (mask & (CEPH_STAT_RSTAT | CEPH_STAT_CAP_XATTR))) + return USE_AUTH_MDS; + else + return USE_ANY_MDS; +} + +/* + * Verify that we have a lease on the given mask. If not, + * do a getattr against an mds. + */ +int __ceph_do_getattr(struct inode *inode, struct page *locked_page, + int mask, bool force) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + int mode; + int err; + + if (ceph_snap(inode) == CEPH_SNAPDIR) { + dout("do_getattr inode %p SNAPDIR\n", inode); + return 0; + } + + dout("do_getattr inode %p mask %s mode 0%o\n", + inode, ceph_cap_string(mask), inode->i_mode); + if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1)) + return 0; + + mode = ceph_try_to_choose_auth_mds(inode, mask); + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode); + if (IS_ERR(req)) + return PTR_ERR(req); + req->r_inode = inode; + ihold(inode); + req->r_num_caps = 1; + req->r_args.getattr.mask = cpu_to_le32(mask); + req->r_locked_page = locked_page; + err = ceph_mdsc_do_request(mdsc, NULL, req); + if (locked_page && err == 0) { + u64 inline_version = req->r_reply_info.targeti.inline_version; + if (inline_version == 0) { + /* the reply is supposed to contain inline data */ + err = -EINVAL; + } else if (inline_version == CEPH_INLINE_NONE || + inline_version == 1) { + err = -ENODATA; + } else { + err = req->r_reply_info.targeti.inline_len; + } + } + ceph_mdsc_put_request(req); + dout("do_getattr result=%d\n", err); + return err; +} + +int ceph_do_getvxattr(struct inode *inode, const char *name, void *value, + size_t size) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_mds_request *req; + int mode = USE_AUTH_MDS; + int err; + char *xattr_value; + size_t xattr_value_len; + + req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETVXATTR, mode); + if (IS_ERR(req)) { + err = -ENOMEM; + goto out; + } + + req->r_feature_needed = CEPHFS_FEATURE_OP_GETVXATTR; + req->r_path2 = kstrdup(name, GFP_NOFS); + if (!req->r_path2) { + err = -ENOMEM; + goto put; + } + + ihold(inode); + req->r_inode = inode; + err = ceph_mdsc_do_request(mdsc, NULL, req); + if (err < 0) + goto put; + + xattr_value = req->r_reply_info.xattr_info.xattr_value; + xattr_value_len = req->r_reply_info.xattr_info.xattr_value_len; + + dout("do_getvxattr xattr_value_len:%zu, size:%zu\n", xattr_value_len, size); + + err = (int)xattr_value_len; + if (size == 0) + goto put; + + if (xattr_value_len > size) { + err = -ERANGE; + goto put; + } + + memcpy(value, xattr_value, xattr_value_len); +put: + ceph_mdsc_put_request(req); +out: + dout("do_getvxattr result=%d\n", err); + return err; +} + + +/* + * Check inode permissions. We verify we have a valid value for + * the AUTH cap, then call the generic handler. + */ +int ceph_permission(struct mnt_idmap *idmap, struct inode *inode, + int mask) +{ + int err; + + if (mask & MAY_NOT_BLOCK) + return -ECHILD; + + err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false); + + if (!err) + err = generic_permission(&nop_mnt_idmap, inode, mask); + return err; +} + +/* Craft a mask of needed caps given a set of requested statx attrs. */ +static int statx_to_caps(u32 want, umode_t mode) +{ + int mask = 0; + + if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME|STATX_CHANGE_COOKIE)) + mask |= CEPH_CAP_AUTH_SHARED; + + if (want & (STATX_NLINK|STATX_CTIME|STATX_CHANGE_COOKIE)) { + /* + * The link count for directories depends on inode->i_subdirs, + * and that is only updated when Fs caps are held. + */ + if (S_ISDIR(mode)) + mask |= CEPH_CAP_FILE_SHARED; + else + mask |= CEPH_CAP_LINK_SHARED; + } + + if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|STATX_BLOCKS|STATX_CHANGE_COOKIE)) + mask |= CEPH_CAP_FILE_SHARED; + + if (want & (STATX_CTIME|STATX_CHANGE_COOKIE)) + mask |= CEPH_CAP_XATTR_SHARED; + + return mask; +} + +/* + * Get all the attributes. If we have sufficient caps for the requested attrs, + * then we can avoid talking to the MDS at all. + */ +int ceph_getattr(struct mnt_idmap *idmap, const struct path *path, + struct kstat *stat, u32 request_mask, unsigned int flags) +{ + struct inode *inode = d_inode(path->dentry); + struct super_block *sb = inode->i_sb; + struct ceph_inode_info *ci = ceph_inode(inode); + u32 valid_mask = STATX_BASIC_STATS; + int err = 0; + + if (ceph_inode_is_shutdown(inode)) + return -ESTALE; + + /* Skip the getattr altogether if we're asked not to sync */ + if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) { + err = ceph_do_getattr(inode, + statx_to_caps(request_mask, inode->i_mode), + flags & AT_STATX_FORCE_SYNC); + if (err) + return err; + } + + generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); + stat->ino = ceph_present_inode(inode); + + /* + * btime on newly-allocated inodes is 0, so if this is still set to + * that, then assume that it's not valid. + */ + if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) { + stat->btime = ci->i_btime; + valid_mask |= STATX_BTIME; + } + + if (request_mask & STATX_CHANGE_COOKIE) { + stat->change_cookie = inode_peek_iversion_raw(inode); + valid_mask |= STATX_CHANGE_COOKIE; + } + + if (ceph_snap(inode) == CEPH_NOSNAP) + stat->dev = sb->s_dev; + else + stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0; + + if (S_ISDIR(inode->i_mode)) { + if (ceph_test_mount_opt(ceph_sb_to_client(sb), RBYTES)) { + stat->size = ci->i_rbytes; + } else if (ceph_snap(inode) == CEPH_SNAPDIR) { + struct ceph_inode_info *pci; + struct ceph_snap_realm *realm; + struct inode *parent; + + parent = ceph_lookup_inode(sb, ceph_ino(inode)); + if (IS_ERR(parent)) + return PTR_ERR(parent); + + pci = ceph_inode(parent); + spin_lock(&pci->i_ceph_lock); + realm = pci->i_snap_realm; + if (realm) + stat->size = realm->num_snaps; + else + stat->size = 0; + spin_unlock(&pci->i_ceph_lock); + iput(parent); + } else { + stat->size = ci->i_files + ci->i_subdirs; + } + stat->blocks = 0; + stat->blksize = 65536; + /* + * Some applications rely on the number of st_nlink + * value on directories to be either 0 (if unlinked) + * or 2 + number of subdirectories. + */ + if (stat->nlink == 1) + /* '.' + '..' + subdirs */ + stat->nlink = 1 + 1 + ci->i_subdirs; + } + + stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC; + if (IS_ENCRYPTED(inode)) + stat->attributes |= STATX_ATTR_ENCRYPTED; + stat->attributes_mask |= (STATX_ATTR_CHANGE_MONOTONIC | + STATX_ATTR_ENCRYPTED); + + stat->result_mask = request_mask & valid_mask; + return err; +} + +void ceph_inode_shutdown(struct inode *inode) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct rb_node *p; + int iputs = 0; + bool invalidate = false; + + spin_lock(&ci->i_ceph_lock); + ci->i_ceph_flags |= CEPH_I_SHUTDOWN; + p = rb_first(&ci->i_caps); + while (p) { + struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); + + p = rb_next(p); + iputs += ceph_purge_inode_cap(inode, cap, &invalidate); + } + spin_unlock(&ci->i_ceph_lock); + + if (invalidate) + ceph_queue_invalidate(inode); + while (iputs--) + iput(inode); +} |