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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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SPDX-License-Identifier: GPL-2.0#include <linux/ceph/ceph_debug.h>
#include <linux/spinlock.h>#include <linux/namei.h>#include <linux/slab.h>#include <linux/sched.h>#include <linux/xattr.h>
#include "super.h"#include "mds_client.h"#include "crypto.h"
/* * Directory operations: readdir, lookup, create, link, unlink, * rename, etc. */
/* * Ceph MDS operations are specified in terms of a base ino and * relative path. Thus, the client can specify an operation on a * specific inode (e.g., a getattr due to fstat(2)), or as a path * relative to, say, the root directory. * * Normally, we limit ourselves to strict inode ops (no path component) * or dentry operations (a single path component relative to an ino). The * exception to this is open_root_dentry(), which will open the mount * point by name. */
const struct dentry_operations ceph_dentry_ops;
static bool __dentry_lease_is_valid(struct ceph_dentry_info *di);static int __dir_lease_try_check(const struct dentry *dentry);
/* * Initialize ceph dentry state. */static int ceph_d_init(struct dentry *dentry){ struct ceph_dentry_info *di; struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb);
di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL); if (!di) return -ENOMEM; /* oh well */
di->dentry = dentry; di->lease_session = NULL; di->time = jiffies; dentry->d_fsdata = di; INIT_LIST_HEAD(&di->lease_list);
atomic64_inc(&mdsc->metric.total_dentries);
return 0;}
/* * for f_pos for readdir: * - hash order: * (0xff << 52) | ((24 bits hash) << 28) | * (the nth entry has hash collision); * - frag+name order; * ((frag value) << 28) | (the nth entry in frag); */#define OFFSET_BITS 28#define OFFSET_MASK ((1 << OFFSET_BITS) - 1)#define HASH_ORDER (0xffull << (OFFSET_BITS + 24))loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order){ loff_t fpos = ((loff_t)high << 28) | (loff_t)off; if (hash_order) fpos |= HASH_ORDER; return fpos;}
static bool is_hash_order(loff_t p){ return (p & HASH_ORDER) == HASH_ORDER;}
static unsigned fpos_frag(loff_t p){ return p >> OFFSET_BITS;}
static unsigned fpos_hash(loff_t p){ return ceph_frag_value(fpos_frag(p));}
static unsigned fpos_off(loff_t p){ return p & OFFSET_MASK;}
static int fpos_cmp(loff_t l, loff_t r){ int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); if (v) return v; return (int)(fpos_off(l) - fpos_off(r));}
/* * make note of the last dentry we read, so we can * continue at the same lexicographical point, * regardless of what dir changes take place on the * server. */static int note_last_dentry(struct ceph_fs_client *fsc, struct ceph_dir_file_info *dfi, const char *name, int len, unsigned next_offset){ char *buf = kmalloc(len+1, GFP_KERNEL); if (!buf) return -ENOMEM; kfree(dfi->last_name); dfi->last_name = buf; memcpy(dfi->last_name, name, len); dfi->last_name[len] = 0; dfi->next_offset = next_offset; doutc(fsc->client, "'%s'\n", dfi->last_name); return 0;}
static struct dentry *__dcache_find_get_entry(struct dentry *parent, u64 idx, struct ceph_readdir_cache_control *cache_ctl){ struct inode *dir = d_inode(parent); struct ceph_client *cl = ceph_inode_to_client(dir); struct dentry *dentry; unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1; loff_t ptr_pos = idx * sizeof(struct dentry *); pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT;
if (ptr_pos >= i_size_read(dir)) return NULL;
if (!cache_ctl->folio || ptr_pgoff != cache_ctl->folio->index) { ceph_readdir_cache_release(cache_ctl); cache_ctl->folio = filemap_lock_folio(&dir->i_data, ptr_pgoff); if (IS_ERR(cache_ctl->folio)) { cache_ctl->folio = NULL; doutc(cl, " folio %lu not found\n", ptr_pgoff); return ERR_PTR(-EAGAIN); } /* reading/filling the cache are serialized by i_rwsem, no need to use folio lock */ folio_unlock(cache_ctl->folio); cache_ctl->dentries = kmap_local_folio(cache_ctl->folio, 0); }
cache_ctl->index = idx & idx_mask;
rcu_read_lock(); spin_lock(&parent->d_lock); /* check i_size again here, because empty directory can be * marked as complete while not holding the i_rwsem. */ if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir)) dentry = cache_ctl->dentries[cache_ctl->index]; else dentry = NULL; spin_unlock(&parent->d_lock); if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) dentry = NULL; rcu_read_unlock(); return dentry ? : ERR_PTR(-EAGAIN);}
/* * When possible, we try to satisfy a readdir by peeking at the * dcache. We make this work by carefully ordering dentries on * d_children when we initially get results back from the MDS, and * falling back to a "normal" sync readdir if any dentries in the dir * are dropped. * * Complete dir indicates that we have all dentries in the dir. It is * defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by * the MDS if/when the directory is modified). */static int __dcache_readdir(struct file *file, struct dir_context *ctx, int shared_gen){ struct ceph_dir_file_info *dfi = file->private_data; struct dentry *parent = file->f_path.dentry; struct inode *dir = d_inode(parent); struct ceph_fs_client *fsc = ceph_inode_to_fs_client(dir); struct ceph_client *cl = ceph_inode_to_client(dir); struct dentry *dentry, *last = NULL; struct ceph_dentry_info *di; struct ceph_readdir_cache_control cache_ctl = {}; u64 idx = 0; int err = 0;
doutc(cl, "%p %llx.%llx v%u at %llx\n", dir, ceph_vinop(dir), (unsigned)shared_gen, ctx->pos);
/* search start position */ if (ctx->pos > 2) { u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *)); while (count > 0) { u64 step = count >> 1; dentry = __dcache_find_get_entry(parent, idx + step, &cache_ctl); if (!dentry) { /* use linear search */ idx = 0; break; } if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out; } di = ceph_dentry(dentry); spin_lock(&dentry->d_lock); if (fpos_cmp(di->offset, ctx->pos) < 0) { idx += step + 1; count -= step + 1; } else { count = step; } spin_unlock(&dentry->d_lock); dput(dentry); }
doutc(cl, "%p %llx.%llx cache idx %llu\n", dir, ceph_vinop(dir), idx); }
for (;;) { bool emit_dentry = false; dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl); if (!dentry) { dfi->file_info.flags |= CEPH_F_ATEND; err = 0; break; } if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out; }
spin_lock(&dentry->d_lock); di = ceph_dentry(dentry); if (d_unhashed(dentry) || d_really_is_negative(dentry) || di->lease_shared_gen != shared_gen || ((dentry->d_flags & DCACHE_NOKEY_NAME) && fscrypt_has_encryption_key(dir))) { spin_unlock(&dentry->d_lock); dput(dentry); err = -EAGAIN; goto out; } if (fpos_cmp(ctx->pos, di->offset) <= 0) { __ceph_dentry_dir_lease_touch(di); emit_dentry = true; } spin_unlock(&dentry->d_lock);
if (emit_dentry) { doutc(cl, " %llx dentry %p %pd %p\n", di->offset, dentry, dentry, d_inode(dentry)); ctx->pos = di->offset; if (!dir_emit(ctx, dentry->d_name.name, dentry->d_name.len, ceph_present_inode(d_inode(dentry)), d_inode(dentry)->i_mode >> 12)) { dput(dentry); err = 0; break; } ctx->pos++;
if (last) dput(last); last = dentry; } else { dput(dentry); } }out: ceph_readdir_cache_release(&cache_ctl); if (last) { int ret; di = ceph_dentry(last); ret = note_last_dentry(fsc, dfi, last->d_name.name, last->d_name.len, fpos_off(di->offset) + 1); if (ret < 0) err = ret; dput(last); /* last_name no longer match cache index */ if (dfi->readdir_cache_idx >= 0) { dfi->readdir_cache_idx = -1; dfi->dir_release_count = 0; } } return err;}
static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos){ if (!dfi->last_readdir) return true; if (is_hash_order(pos)) return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos)); else return dfi->frag != fpos_frag(pos);}
static int ceph_readdir(struct file *file, struct dir_context *ctx){ struct ceph_dir_file_info *dfi = file->private_data; struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); struct ceph_mds_client *mdsc = fsc->mdsc; struct ceph_client *cl = fsc->client; int i; int err; unsigned frag = -1; struct ceph_mds_reply_info_parsed *rinfo;
doutc(cl, "%p %llx.%llx file %p pos %llx\n", inode, ceph_vinop(inode), file, ctx->pos); if (dfi->file_info.flags & CEPH_F_ATEND) return 0;
/* always start with . and .. */ if (ctx->pos == 0) { doutc(cl, "%p %llx.%llx off 0 -> '.'\n", inode, ceph_vinop(inode)); if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode), inode->i_mode >> 12)) return 0; ctx->pos = 1; } if (ctx->pos == 1) { u64 ino; struct dentry *dentry = file->f_path.dentry;
spin_lock(&dentry->d_lock); ino = ceph_present_inode(dentry->d_parent->d_inode); spin_unlock(&dentry->d_lock);
doutc(cl, "%p %llx.%llx off 1 -> '..'\n", inode, ceph_vinop(inode)); if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12)) return 0; ctx->pos = 2; }
err = ceph_fscrypt_prepare_readdir(inode); if (err < 0) return err;
spin_lock(&ci->i_ceph_lock); /* request Fx cap. if have Fx, we don't need to release Fs cap * for later create/unlink. */ __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR); /* can we use the dcache? */ if (ceph_test_mount_opt(fsc, DCACHE) && !ceph_test_mount_opt(fsc, NOASYNCREADDIR) && ceph_snap(inode) != CEPH_SNAPDIR && __ceph_dir_is_complete_ordered(ci) && __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { int shared_gen = atomic_read(&ci->i_shared_gen);
spin_unlock(&ci->i_ceph_lock); err = __dcache_readdir(file, ctx, shared_gen); if (err != -EAGAIN) return err; } else { spin_unlock(&ci->i_ceph_lock); }
/* proceed with a normal readdir */more: /* do we have the correct frag content buffered? */ if (need_send_readdir(dfi, ctx->pos)) { struct ceph_mds_request *req; int op = ceph_snap(inode) == CEPH_SNAPDIR ? CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR;
/* discard old result, if any */ if (dfi->last_readdir) { ceph_mdsc_put_request(dfi->last_readdir); dfi->last_readdir = NULL; }
if (is_hash_order(ctx->pos)) { /* fragtree isn't always accurate. choose frag * based on previous reply when possible. */ if (frag == (unsigned)-1) frag = ceph_choose_frag(ci, fpos_hash(ctx->pos), NULL, NULL); } else { frag = fpos_frag(ctx->pos); }
doutc(cl, "fetching %p %llx.%llx frag %x offset '%s'\n", inode, ceph_vinop(inode), frag, dfi->last_name); req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); if (IS_ERR(req)) return PTR_ERR(req);
err = ceph_alloc_readdir_reply_buffer(req, inode); if (err) { ceph_mdsc_put_request(req); return err; } /* hints to request -> mds selection code */ req->r_direct_mode = USE_AUTH_MDS; if (op == CEPH_MDS_OP_READDIR) { req->r_direct_hash = ceph_frag_value(frag); __set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); req->r_inode_drop = CEPH_CAP_FILE_EXCL; } if (dfi->last_name) { int len = strlen(dfi->last_name);
req->r_path2 = kzalloc(NAME_MAX + 1, GFP_KERNEL); if (!req->r_path2) { ceph_mdsc_put_request(req); return -ENOMEM; } memcpy(req->r_path2, dfi->last_name, len);
err = ceph_encode_encrypted_dname(inode, req->r_path2, len); if (err < 0) { ceph_mdsc_put_request(req); return err; } } else if (is_hash_order(ctx->pos)) { req->r_args.readdir.offset_hash = cpu_to_le32(fpos_hash(ctx->pos)); }
req->r_dir_release_cnt = dfi->dir_release_count; req->r_dir_ordered_cnt = dfi->dir_ordered_count; req->r_readdir_cache_idx = dfi->readdir_cache_idx; req->r_readdir_offset = dfi->next_offset; req->r_args.readdir.frag = cpu_to_le32(frag); req->r_args.readdir.flags = cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS);
req->r_inode = inode; ihold(inode); req->r_dentry = dget(file->f_path.dentry); err = ceph_mdsc_do_request(mdsc, NULL, req); if (err < 0) { ceph_mdsc_put_request(req); return err; } doutc(cl, "%p %llx.%llx got and parsed readdir result=%d" "on frag %x, end=%d, complete=%d, hash_order=%d\n", inode, ceph_vinop(inode), err, frag, (int)req->r_reply_info.dir_end, (int)req->r_reply_info.dir_complete, (int)req->r_reply_info.hash_order);
rinfo = &req->r_reply_info; if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { frag = le32_to_cpu(rinfo->dir_dir->frag); if (!rinfo->hash_order) { dfi->next_offset = req->r_readdir_offset; /* adjust ctx->pos to beginning of frag */ ctx->pos = ceph_make_fpos(frag, dfi->next_offset, false); } }
dfi->frag = frag; dfi->last_readdir = req;
if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) { dfi->readdir_cache_idx = req->r_readdir_cache_idx; if (dfi->readdir_cache_idx < 0) { /* preclude from marking dir ordered */ dfi->dir_ordered_count = 0; } else if (ceph_frag_is_leftmost(frag) && dfi->next_offset == 2) { /* note dir version at start of readdir so * we can tell if any dentries get dropped */ dfi->dir_release_count = req->r_dir_release_cnt; dfi->dir_ordered_count = req->r_dir_ordered_cnt; } } else { doutc(cl, "%p %llx.%llx !did_prepopulate\n", inode, ceph_vinop(inode)); /* disable readdir cache */ dfi->readdir_cache_idx = -1; /* preclude from marking dir complete */ dfi->dir_release_count = 0; }
/* note next offset and last dentry name */ if (rinfo->dir_nr > 0) { struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + (rinfo->dir_nr-1); unsigned next_offset = req->r_reply_info.dir_end ? 2 : (fpos_off(rde->offset) + 1); err = note_last_dentry(fsc, dfi, rde->name, rde->name_len, next_offset); if (err) { ceph_mdsc_put_request(dfi->last_readdir); dfi->last_readdir = NULL; return err; } } else if (req->r_reply_info.dir_end) { dfi->next_offset = 2; /* keep last name */ } }
rinfo = &dfi->last_readdir->r_reply_info; doutc(cl, "%p %llx.%llx frag %x num %d pos %llx chunk first %llx\n", inode, ceph_vinop(inode), dfi->frag, rinfo->dir_nr, ctx->pos, rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL);
i = 0; /* search start position */ if (rinfo->dir_nr > 0) { int step, nr = rinfo->dir_nr; while (nr > 0) { step = nr >> 1; if (rinfo->dir_entries[i + step].offset < ctx->pos) { i += step + 1; nr -= step + 1; } else { nr = step; } } } for (; i < rinfo->dir_nr; i++) { struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
if (rde->offset < ctx->pos) { pr_warn_client(cl, "%p %llx.%llx rde->offset 0x%llx ctx->pos 0x%llx\n", inode, ceph_vinop(inode), rde->offset, ctx->pos); ceph_mdsc_put_request(dfi->last_readdir); dfi->last_readdir = NULL; return -EIO; }
if (WARN_ON_ONCE(!rde->inode.in)) { ceph_mdsc_put_request(dfi->last_readdir); dfi->last_readdir = NULL; return -EIO; }
ctx->pos = rde->offset; doutc(cl, "%p %llx.%llx (%d/%d) -> %llx '%.*s' %p\n", inode, ceph_vinop(inode), i, rinfo->dir_nr, ctx->pos, rde->name_len, rde->name, &rde->inode.in);
if (!dir_emit(ctx, rde->name, rde->name_len, ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)), le32_to_cpu(rde->inode.in->mode) >> 12)) { /* * NOTE: Here no need to put the 'dfi->last_readdir', * because when dir_emit stops us it's most likely * doesn't have enough memory, etc. So for next readdir * it will continue. */ doutc(cl, "filldir stopping us...\n"); return 0; }
/* Reset the lengths to their original allocated vals */ ctx->pos++; }
ceph_mdsc_put_request(dfi->last_readdir); dfi->last_readdir = NULL;
if (dfi->next_offset > 2) { frag = dfi->frag; goto more; }
/* more frags? */ if (!ceph_frag_is_rightmost(dfi->frag)) { frag = ceph_frag_next(dfi->frag); if (is_hash_order(ctx->pos)) { loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag), dfi->next_offset, true); if (new_pos > ctx->pos) ctx->pos = new_pos; /* keep last_name */ } else { ctx->pos = ceph_make_fpos(frag, dfi->next_offset, false); kfree(dfi->last_name); dfi->last_name = NULL; } doutc(cl, "%p %llx.%llx next frag is %x\n", inode, ceph_vinop(inode), frag); goto more; } dfi->file_info.flags |= CEPH_F_ATEND;
/* * if dir_release_count still matches the dir, no dentries * were released during the whole readdir, and we should have * the complete dir contents in our cache. */ if (atomic64_read(&ci->i_release_count) == dfi->dir_release_count) { spin_lock(&ci->i_ceph_lock); if (dfi->dir_ordered_count == atomic64_read(&ci->i_ordered_count)) { doutc(cl, " marking %p %llx.%llx complete and ordered\n", inode, ceph_vinop(inode)); /* use i_size to track number of entries in * readdir cache */ BUG_ON(dfi->readdir_cache_idx < 0); i_size_write(inode, dfi->readdir_cache_idx * sizeof(struct dentry*)); } else { doutc(cl, " marking %llx.%llx complete\n", ceph_vinop(inode)); } __ceph_dir_set_complete(ci, dfi->dir_release_count, dfi->dir_ordered_count); spin_unlock(&ci->i_ceph_lock); } doutc(cl, "%p %llx.%llx file %p done.\n", inode, ceph_vinop(inode), file); return 0;}
static void reset_readdir(struct ceph_dir_file_info *dfi){ if (dfi->last_readdir) { ceph_mdsc_put_request(dfi->last_readdir); dfi->last_readdir = NULL; } kfree(dfi->last_name); dfi->last_name = NULL; dfi->dir_release_count = 0; dfi->readdir_cache_idx = -1; dfi->next_offset = 2; /* compensate for . and .. */ dfi->file_info.flags &= ~CEPH_F_ATEND;}
/* * discard buffered readdir content on seekdir(0), or seek to new frag, * or seek prior to current chunk */static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos){ struct ceph_mds_reply_info_parsed *rinfo; loff_t chunk_offset; if (new_pos == 0) return true; if (is_hash_order(new_pos)) { /* no need to reset last_name for a forward seek when * dentries are sorted in hash order */ } else if (dfi->frag != fpos_frag(new_pos)) { return true; } rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL; if (!rinfo || !rinfo->dir_nr) return true; chunk_offset = rinfo->dir_entries[0].offset; return new_pos < chunk_offset || is_hash_order(new_pos) != is_hash_order(chunk_offset);}
static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence){ struct ceph_dir_file_info *dfi = file->private_data; struct inode *inode = file->f_mapping->host; struct ceph_client *cl = ceph_inode_to_client(inode); loff_t retval;
inode_lock(inode); retval = -EINVAL; switch (whence) { case SEEK_CUR: offset += file->f_pos; break; case SEEK_SET: break; case SEEK_END: retval = -EOPNOTSUPP; goto out; default: goto out; }
if (offset >= 0) { if (need_reset_readdir(dfi, offset)) { doutc(cl, "%p %llx.%llx dropping %p content\n", inode, ceph_vinop(inode), file); reset_readdir(dfi); } else if (is_hash_order(offset) && offset > file->f_pos) { /* for hash offset, we don't know if a forward seek * is within same frag */ dfi->dir_release_count = 0; dfi->readdir_cache_idx = -1; }
if (offset != file->f_pos) { file->f_pos = offset; dfi->file_info.flags &= ~CEPH_F_ATEND; } retval = offset; }out: inode_unlock(inode); return retval;}
/* * Handle lookups for the hidden .snap directory. */struct dentry *ceph_handle_snapdir(struct ceph_mds_request *req, struct dentry *dentry){ struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb); struct inode *parent = d_inode(dentry->d_parent); /* we hold i_rwsem */ struct ceph_client *cl = ceph_inode_to_client(parent);
/* .snap dir? */ if (ceph_snap(parent) == CEPH_NOSNAP && strcmp(dentry->d_name.name, fsc->mount_options->snapdir_name) == 0) { struct dentry *res; struct inode *inode = ceph_get_snapdir(parent);
res = d_splice_alias(inode, dentry); doutc(cl, "ENOENT on snapdir %p '%pd', linking to " "snapdir %p %llx.%llx. Spliced dentry %p\n", dentry, dentry, inode, ceph_vinop(inode), res); if (res) dentry = res; } return dentry;}
/* * Figure out final result of a lookup/open request. * * Mainly, make sure we return the final req->r_dentry (if it already * existed) in place of the original VFS-provided dentry when they * differ. * * Gracefully handle the case where the MDS replies with -ENOENT and * no trace (which it may do, at its discretion, e.g., if it doesn't * care to issue a lease on the negative dentry). */struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, struct dentry *dentry, int err){ struct ceph_client *cl = req->r_mdsc->fsc->client;
if (err == -ENOENT) { /* no trace? */ err = 0; if (!req->r_reply_info.head->is_dentry) { doutc(cl, "ENOENT and no trace, dentry %p inode %llx.%llx\n", dentry, ceph_vinop(d_inode(dentry))); if (d_really_is_positive(dentry)) { d_drop(dentry); err = -ENOENT; } else { if (d_unhashed(dentry)) d_add(dentry, NULL); } } } if (err) dentry = ERR_PTR(err); else if (dentry != req->r_dentry) dentry = dget(req->r_dentry); /* we got spliced */ else dentry = NULL; return dentry;}
static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry){ return ceph_ino(inode) == CEPH_INO_ROOT && strncmp(dentry->d_name.name, ".ceph", 5) == 0;}
/* * Look up a single dir entry. If there is a lookup intent, inform * the MDS so that it gets our 'caps wanted' value in a single op. */static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags){ struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb); struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); struct ceph_client *cl = fsc->client; struct ceph_mds_request *req; int op; int mask; int err;
doutc(cl, "%p %llx.%llx/'%pd' dentry %p\n", dir, ceph_vinop(dir), dentry, dentry);
if (dentry->d_name.len > NAME_MAX) return ERR_PTR(-ENAMETOOLONG);
if (IS_ENCRYPTED(dir)) { bool had_key = fscrypt_has_encryption_key(dir);
err = fscrypt_prepare_lookup_partial(dir, dentry); if (err < 0) return ERR_PTR(err);
/* mark directory as incomplete if it has been unlocked */ if (!had_key && fscrypt_has_encryption_key(dir)) ceph_dir_clear_complete(dir); }
/* can we conclude ENOENT locally? */ if (d_really_is_negative(dentry)) { struct ceph_inode_info *ci = ceph_inode(dir); struct ceph_dentry_info *di = ceph_dentry(dentry);
spin_lock(&ci->i_ceph_lock); doutc(cl, " dir %llx.%llx flags are 0x%lx\n", ceph_vinop(dir), ci->i_ceph_flags); if (strncmp(dentry->d_name.name, fsc->mount_options->snapdir_name, dentry->d_name.len) && !is_root_ceph_dentry(dir, dentry) && ceph_test_mount_opt(fsc, DCACHE) && __ceph_dir_is_complete(ci) && __ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); spin_unlock(&ci->i_ceph_lock); doutc(cl, " dir %llx.%llx complete, -ENOENT\n", ceph_vinop(dir)); if (d_unhashed(dentry)) d_add(dentry, NULL); di->lease_shared_gen = atomic_read(&ci->i_shared_gen); return NULL; } spin_unlock(&ci->i_ceph_lock); }
op = ceph_snap(dir) == CEPH_SNAPDIR ? CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); if (IS_ERR(req)) return ERR_CAST(req); req->r_dentry = dget(dentry); req->r_num_caps = 2;
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; if (ceph_security_xattr_wanted(dir)) mask |= CEPH_CAP_XATTR_SHARED; req->r_args.getattr.mask = cpu_to_le32(mask);
ihold(dir); req->r_parent = dir; set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); err = ceph_mdsc_do_request(mdsc, NULL, req); if (err == -ENOENT) { struct dentry *res;
res = ceph_handle_snapdir(req, dentry); if (IS_ERR(res)) { err = PTR_ERR(res); } else { dentry = res; err = 0; } } dentry = ceph_finish_lookup(req, dentry, err); ceph_mdsc_put_request(req); /* will dput(dentry) */ doutc(cl, "result=%p\n", dentry); return dentry;}
/* * If we do a create but get no trace back from the MDS, follow up with * a lookup (the VFS expects us to link up the provided dentry). */int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry){ struct dentry *result = ceph_lookup(dir, dentry, 0);
if (result && !IS_ERR(result)) { /* * We created the item, then did a lookup, and found * it was already linked to another inode we already * had in our cache (and thus got spliced). To not * confuse VFS (especially when inode is a directory), * we don't link our dentry to that inode, return an * error instead. * * This event should be rare and it happens only when * we talk to old MDS. Recent MDS does not send traceless * reply for request that creates new inode. */ d_drop(result); return -ESTALE; } return PTR_ERR(result);}
static int ceph_mknod(struct mnt_idmap *idmap, struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev){ struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); struct ceph_client *cl = mdsc->fsc->client; struct ceph_mds_request *req; struct ceph_acl_sec_ctx as_ctx = {}; int err;
if (ceph_snap(dir) != CEPH_NOSNAP) return -EROFS;
err = ceph_wait_on_conflict_unlink(dentry); if (err) return err;
if (ceph_quota_is_max_files_exceeded(dir)) { err = -EDQUOT; goto out; }
doutc(cl, "%p %llx.%llx/'%pd' dentry %p mode 0%ho rdev %d\n", dir, ceph_vinop(dir), dentry, dentry, mode, rdev); req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); if (IS_ERR(req)) { err = PTR_ERR(req); goto out; }
req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx); if (IS_ERR(req->r_new_inode)) { err = PTR_ERR(req->r_new_inode); req->r_new_inode = NULL; goto out_req; }
if (S_ISREG(mode) && IS_ENCRYPTED(dir)) set_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags);
req->r_dentry = dget(dentry); req->r_num_caps = 2; req->r_parent = dir; ihold(dir); set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); req->r_mnt_idmap = mnt_idmap_get(idmap); req->r_args.mknod.mode = cpu_to_le32(mode); req->r_args.mknod.rdev = cpu_to_le32(rdev); req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL | CEPH_CAP_XATTR_EXCL; req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
ceph_as_ctx_to_req(req, &as_ctx);
err = ceph_mdsc_do_request(mdsc, dir, req); if (!err && !req->r_reply_info.head->is_dentry) err = ceph_handle_notrace_create(dir, dentry);out_req: ceph_mdsc_put_request(req);out: if (!err) ceph_init_inode_acls(d_inode(dentry), &as_ctx); else d_drop(dentry); ceph_release_acl_sec_ctx(&as_ctx); return err;}
static int ceph_create(struct mnt_idmap *idmap, struct inode *dir, struct dentry *dentry, umode_t mode, bool excl){ return ceph_mknod(idmap, dir, dentry, mode, 0);}
#if IS_ENABLED(CONFIG_FS_ENCRYPTION)static int prep_encrypted_symlink_target(struct ceph_mds_request *req, const char *dest){ int err; int len = strlen(dest); struct fscrypt_str osd_link = FSTR_INIT(NULL, 0);
err = fscrypt_prepare_symlink(req->r_parent, dest, len, PATH_MAX, &osd_link); if (err) goto out;
err = fscrypt_encrypt_symlink(req->r_new_inode, dest, len, &osd_link); if (err) goto out;
req->r_path2 = kmalloc(BASE64_CHARS(osd_link.len) + 1, GFP_KERNEL); if (!req->r_path2) { err = -ENOMEM; goto out; }
len = base64_encode(osd_link.name, osd_link.len, req->r_path2, false, BASE64_IMAP); req->r_path2[len] = '\0';out: fscrypt_fname_free_buffer(&osd_link); return err;}#elsestatic int prep_encrypted_symlink_target(struct ceph_mds_request *req, const char *dest){ return -EOPNOTSUPP;}#endif
static int ceph_symlink(struct mnt_idmap *idmap, struct inode *dir, struct dentry *dentry, const char *dest){ struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); struct ceph_client *cl = mdsc->fsc->client; struct ceph_mds_request *req; struct ceph_acl_sec_ctx as_ctx = {}; umode_t mode = S_IFLNK | 0777; int err;
if (ceph_snap(dir) != CEPH_NOSNAP) return -EROFS;
err = ceph_wait_on_conflict_unlink(dentry); if (err) return err;
if (ceph_quota_is_max_files_exceeded(dir)) { err = -EDQUOT; goto out; }
doutc(cl, "%p %llx.%llx/'%pd' to '%s'\n", dir, ceph_vinop(dir), dentry, dest); req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); if (IS_ERR(req)) { err = PTR_ERR(req); goto out; }
req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx); if (IS_ERR(req->r_new_inode)) { err = PTR_ERR(req->r_new_inode); req->r_new_inode = NULL; goto out_req; }
req->r_parent = dir; ihold(dir);
if (IS_ENCRYPTED(req->r_new_inode)) { err = prep_encrypted_symlink_target(req, dest); if (err) goto out_req; } else { req->r_path2 = kstrdup(dest, GFP_KERNEL); if (!req->r_path2) { err = -ENOMEM; goto out_req; } }
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); req->r_mnt_idmap = mnt_idmap_get(idmap); req->r_dentry = dget(dentry); req->r_num_caps = 2; req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL | CEPH_CAP_XATTR_EXCL; req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
ceph_as_ctx_to_req(req, &as_ctx);
err = ceph_mdsc_do_request(mdsc, dir, req); if (!err && !req->r_reply_info.head->is_dentry) err = ceph_handle_notrace_create(dir, dentry);out_req: ceph_mdsc_put_request(req);out: if (err) d_drop(dentry); ceph_release_acl_sec_ctx(&as_ctx); return err;}
static struct dentry *ceph_mkdir(struct mnt_idmap *idmap, struct inode *dir, struct dentry *dentry, umode_t mode){ struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); struct ceph_client *cl = mdsc->fsc->client; struct ceph_mds_request *req; struct ceph_acl_sec_ctx as_ctx = {}; struct dentry *ret; int err; int op;
err = ceph_wait_on_conflict_unlink(dentry); if (err) return ERR_PTR(err);
if (ceph_snap(dir) == CEPH_SNAPDIR) { /* mkdir .snap/foo is a MKSNAP */ op = CEPH_MDS_OP_MKSNAP; doutc(cl, "mksnap %llx.%llx/'%pd' dentry %p\n", ceph_vinop(dir), dentry, dentry); } else if (ceph_snap(dir) == CEPH_NOSNAP) { doutc(cl, "mkdir %llx.%llx/'%pd' dentry %p mode 0%ho\n", ceph_vinop(dir), dentry, dentry, mode); op = CEPH_MDS_OP_MKDIR; } else { ret = ERR_PTR(-EROFS); goto out; }
if (op == CEPH_MDS_OP_MKDIR && ceph_quota_is_max_files_exceeded(dir)) { ret = ERR_PTR(-EDQUOT); goto out; } if ((op == CEPH_MDS_OP_MKSNAP) && IS_ENCRYPTED(dir) && !fscrypt_has_encryption_key(dir)) { ret = ERR_PTR(-ENOKEY); goto out; }
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); if (IS_ERR(req)) { ret = ERR_CAST(req); goto out; }
mode |= S_IFDIR; req->r_new_inode = ceph_new_inode(dir, dentry, &mode, &as_ctx); if (IS_ERR(req->r_new_inode)) { ret = ERR_CAST(req->r_new_inode); req->r_new_inode = NULL; goto out_req; }
req->r_dentry = dget(dentry); req->r_num_caps = 2; req->r_parent = dir; ihold(dir); set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); if (op == CEPH_MDS_OP_MKDIR) req->r_mnt_idmap = mnt_idmap_get(idmap); req->r_args.mkdir.mode = cpu_to_le32(mode); req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL | CEPH_CAP_XATTR_EXCL; req->r_dentry_unless = CEPH_CAP_FILE_EXCL;
ceph_as_ctx_to_req(req, &as_ctx);
err = ceph_mdsc_do_request(mdsc, dir, req); if (!err && !req->r_reply_info.head->is_target && !req->r_reply_info.head->is_dentry) err = ceph_handle_notrace_create(dir, dentry); ret = ERR_PTR(err);out_req: if (!IS_ERR(ret) && req->r_dentry != dentry) /* Some other dentry was spliced in */ ret = dget(req->r_dentry); ceph_mdsc_put_request(req);out: if (!IS_ERR(ret)) { if (ret) dentry = ret; ceph_init_inode_acls(d_inode(dentry), &as_ctx); } else { d_drop(dentry); } ceph_release_acl_sec_ctx(&as_ctx); return ret;}
static int ceph_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry){ struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); struct ceph_client *cl = mdsc->fsc->client; struct ceph_mds_request *req; int err;
if (dentry->d_flags & DCACHE_DISCONNECTED) return -EINVAL;
err = ceph_wait_on_conflict_unlink(dentry); if (err) return err;
if (ceph_snap(dir) != CEPH_NOSNAP) return -EROFS;
err = fscrypt_prepare_link(old_dentry, dir, dentry); if (err) return err;
doutc(cl, "%p %llx.%llx/'%pd' to '%pd'\n", dir, ceph_vinop(dir), old_dentry, dentry); req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); if (IS_ERR(req)) { d_drop(dentry); return PTR_ERR(req); } req->r_dentry = dget(dentry); req->r_num_caps = 2; req->r_old_dentry = dget(old_dentry); /* * The old_dentry maybe a DCACHE_DISCONNECTED dentry, then we * will just pass the ino# to MDSs. */ if (old_dentry->d_flags & DCACHE_DISCONNECTED) req->r_ino2 = ceph_vino(d_inode(old_dentry)); req->r_parent = dir; ihold(dir); set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; req->r_dentry_unless = CEPH_CAP_FILE_EXCL; /* release LINK_SHARED on source inode (mds will lock it) */ req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; err = ceph_mdsc_do_request(mdsc, dir, req); if (err) { d_drop(dentry); } else if (!req->r_reply_info.head->is_dentry) { ihold(d_inode(old_dentry)); d_instantiate(dentry, d_inode(old_dentry)); } ceph_mdsc_put_request(req); return err;}
static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc, struct ceph_mds_request *req){ struct dentry *dentry = req->r_dentry; struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb); struct ceph_client *cl = fsc->client; struct ceph_dentry_info *di = ceph_dentry(dentry); int result = req->r_err ? req->r_err : le32_to_cpu(req->r_reply_info.head->result);
if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags)) pr_warn_client(cl, "dentry %p:%pd async unlink bit is not set\n", dentry, dentry);
spin_lock(&fsc->async_unlink_conflict_lock); hash_del_rcu(&di->hnode); spin_unlock(&fsc->async_unlink_conflict_lock);
spin_lock(&dentry->d_lock); clear_and_wake_up_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags); spin_unlock(&dentry->d_lock);
synchronize_rcu();
if (result == -EJUKEBOX) goto out;
/* If op failed, mark everyone involved for errors */ if (result) { struct ceph_path_info path_info = {0}; char *path = ceph_mdsc_build_path(mdsc, dentry, &path_info, 0);
/* mark error on parent + clear complete */ mapping_set_error(req->r_parent->i_mapping, result); ceph_dir_clear_complete(req->r_parent);
/* drop the dentry -- we don't know its status */ if (!d_unhashed(dentry)) d_drop(dentry);
/* mark inode itself for an error (since metadata is bogus) */ mapping_set_error(req->r_old_inode->i_mapping, result);
pr_warn_client(cl, "failure path=(%llx)%s result=%d!\n", path_info.vino.ino, IS_ERR(path) ? "<<bad>>" : path, result); ceph_mdsc_free_path_info(&path_info); }out: iput(req->r_old_inode); ceph_mdsc_release_dir_caps(req);}
static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry){ struct ceph_inode_info *ci = ceph_inode(dir); struct ceph_dentry_info *di; int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK;
spin_lock(&ci->i_ceph_lock); if ((__ceph_caps_issued(ci, NULL) & want) == want) { ceph_take_cap_refs(ci, want, false); got = want; } spin_unlock(&ci->i_ceph_lock);
/* If we didn't get anything, return 0 */ if (!got) return 0;
spin_lock(&dentry->d_lock); di = ceph_dentry(dentry); /* * - We are holding Fx, which implies Fs caps. * - Only support async unlink for primary linkage */ if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen || !(di->flags & CEPH_DENTRY_PRIMARY_LINK)) want = 0; spin_unlock(&dentry->d_lock);
/* Do we still want what we've got? */ if (want == got) return got;
ceph_put_cap_refs(ci, got); return 0;}
/* * rmdir and unlink are differ only by the metadata op code */static int ceph_unlink(struct inode *dir, struct dentry *dentry){ struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dir->i_sb); struct ceph_client *cl = fsc->client; struct ceph_mds_client *mdsc = fsc->mdsc; struct inode *inode = d_inode(dentry); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_mds_request *req; bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS); struct dentry *dn; int err = -EROFS; int op; char *path;
if (ceph_snap(dir) == CEPH_SNAPDIR) { /* rmdir .snap/foo is RMSNAP */ doutc(cl, "rmsnap %llx.%llx/'%pd' dn\n", ceph_vinop(dir), dentry); op = CEPH_MDS_OP_RMSNAP; } else if (ceph_snap(dir) == CEPH_NOSNAP) { doutc(cl, "unlink/rmdir %llx.%llx/'%pd' inode %llx.%llx\n", ceph_vinop(dir), dentry, ceph_vinop(inode)); op = d_is_dir(dentry) ? CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; } else goto out;
dn = d_find_alias(dir); if (!dn) { try_async = false; } else { struct ceph_path_info path_info = {0}; path = ceph_mdsc_build_path(mdsc, dn, &path_info, 0); if (IS_ERR(path)) { try_async = false; err = 0; } else { err = ceph_mds_check_access(mdsc, path, MAY_WRITE); } ceph_mdsc_free_path_info(&path_info); dput(dn);
/* For none EACCES cases will let the MDS do the mds auth check */ if (err == -EACCES) { return err; } else if (err < 0) { try_async = false; err = 0; } }
retry: req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); if (IS_ERR(req)) { err = PTR_ERR(req); goto out; } req->r_dentry = dget(dentry); req->r_num_caps = 2; req->r_parent = dir; ihold(dir); req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; req->r_dentry_unless = CEPH_CAP_FILE_EXCL; req->r_inode_drop = ceph_drop_caps_for_unlink(inode);
if (try_async && op == CEPH_MDS_OP_UNLINK && (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) { struct ceph_dentry_info *di = ceph_dentry(dentry);
doutc(cl, "async unlink on %llx.%llx/'%pd' caps=%s", ceph_vinop(dir), dentry, ceph_cap_string(req->r_dir_caps)); set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags); req->r_callback = ceph_async_unlink_cb; req->r_old_inode = d_inode(dentry); ihold(req->r_old_inode);
spin_lock(&dentry->d_lock); di->flags |= CEPH_DENTRY_ASYNC_UNLINK; spin_unlock(&dentry->d_lock);
spin_lock(&fsc->async_unlink_conflict_lock); hash_add_rcu(fsc->async_unlink_conflict, &di->hnode, dentry->d_name.hash); spin_unlock(&fsc->async_unlink_conflict_lock);
err = ceph_mdsc_submit_request(mdsc, dir, req); if (!err) { /* * We have enough caps, so we assume that the unlink * will succeed. Fix up the target inode and dcache. */
/* * Protect the i_nlink update with i_ceph_lock * to precent racing against ceph_fill_inode() * handling our completion on a worker thread * and don't decrement if i_nlink has already * been updated to zero by this completion. */ spin_lock(&ci->i_ceph_lock); if (inode->i_nlink > 0) drop_nlink(inode); spin_unlock(&ci->i_ceph_lock);
d_delete(dentry); } else { spin_lock(&fsc->async_unlink_conflict_lock); hash_del_rcu(&di->hnode); spin_unlock(&fsc->async_unlink_conflict_lock);
spin_lock(&dentry->d_lock); di->flags &= ~CEPH_DENTRY_ASYNC_UNLINK; spin_unlock(&dentry->d_lock);
if (err == -EJUKEBOX) { try_async = false; ceph_mdsc_put_request(req); goto retry; } } } else { set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); err = ceph_mdsc_do_request(mdsc, dir, req); if (!err && !req->r_reply_info.head->is_dentry) d_delete(dentry); }
ceph_mdsc_put_request(req);out: return err;}
static int ceph_rename(struct mnt_idmap *idmap, struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry, unsigned int flags){ struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb); struct ceph_client *cl = mdsc->fsc->client; struct ceph_mds_request *req; int op = CEPH_MDS_OP_RENAME; int err;
if (flags) return -EINVAL;
if (ceph_snap(old_dir) != ceph_snap(new_dir)) return -EXDEV; if (ceph_snap(old_dir) != CEPH_NOSNAP) { if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) op = CEPH_MDS_OP_RENAMESNAP; else return -EROFS; } /* don't allow cross-quota renames */ if ((old_dir != new_dir) && (!ceph_quota_is_same_realm(old_dir, new_dir))) return -EXDEV;
err = ceph_wait_on_conflict_unlink(new_dentry); if (err) return err;
err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry, flags); if (err) return err;
doutc(cl, "%llx.%llx/'%pd' to %llx.%llx/'%pd'\n", ceph_vinop(old_dir), old_dentry, ceph_vinop(new_dir), new_dentry); req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); if (IS_ERR(req)) return PTR_ERR(req); ihold(old_dir); req->r_dentry = dget(new_dentry); req->r_num_caps = 2; req->r_old_dentry = dget(old_dentry); req->r_old_dentry_dir = old_dir; req->r_parent = new_dir; ihold(new_dir); set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_XATTR_EXCL; req->r_dentry_unless = CEPH_CAP_FILE_EXCL; /* release LINK_RDCACHE on source inode (mds will lock it) */ req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; if (d_really_is_positive(new_dentry)) { req->r_inode_drop = ceph_drop_caps_for_unlink(d_inode(new_dentry)); } err = ceph_mdsc_do_request(mdsc, old_dir, req); if (!err && !req->r_reply_info.head->is_dentry) { /* * Normally d_move() is done by fill_trace (called by * do_request, above). If there is no trace, we need * to do it here. */ d_move(old_dentry, new_dentry); } ceph_mdsc_put_request(req); return err;}
/* * Move dentry to tail of mdsc->dentry_leases list when lease is updated. * Leases at front of the list will expire first. (Assume all leases have * similar duration) * * Called under dentry->d_lock. */void __ceph_dentry_lease_touch(struct ceph_dentry_info *di){ struct dentry *dn = di->dentry; struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dn->d_sb)->mdsc; struct ceph_client *cl = mdsc->fsc->client;
doutc(cl, "%p %p '%pd'\n", di, dn, dn);
di->flags |= CEPH_DENTRY_LEASE_LIST; if (di->flags & CEPH_DENTRY_SHRINK_LIST) { di->flags |= CEPH_DENTRY_REFERENCED; return; }
spin_lock(&mdsc->dentry_list_lock); list_move_tail(&di->lease_list, &mdsc->dentry_leases); spin_unlock(&mdsc->dentry_list_lock);}
static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc, struct ceph_dentry_info *di){ di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED); di->lease_gen = 0; di->time = jiffies; list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases);}
/* * When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases * list if it's not in the list, otherwise set 'referenced' flag. * * Called under dentry->d_lock. */void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di){ struct dentry *dn = di->dentry; struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dn->d_sb)->mdsc; struct ceph_client *cl = mdsc->fsc->client;
doutc(cl, "%p %p '%pd' (offset 0x%llx)\n", di, dn, dn, di->offset);
if (!list_empty(&di->lease_list)) { if (di->flags & CEPH_DENTRY_LEASE_LIST) { /* don't remove dentry from dentry lease list * if its lease is valid */ if (__dentry_lease_is_valid(di)) return; } else { di->flags |= CEPH_DENTRY_REFERENCED; return; } }
if (di->flags & CEPH_DENTRY_SHRINK_LIST) { di->flags |= CEPH_DENTRY_REFERENCED; di->flags &= ~CEPH_DENTRY_LEASE_LIST; return; }
spin_lock(&mdsc->dentry_list_lock); __dentry_dir_lease_touch(mdsc, di); spin_unlock(&mdsc->dentry_list_lock);}
static void __dentry_lease_unlist(struct ceph_dentry_info *di){ struct ceph_mds_client *mdsc; if (di->flags & CEPH_DENTRY_SHRINK_LIST) return; if (list_empty(&di->lease_list)) return;
mdsc = ceph_sb_to_fs_client(di->dentry->d_sb)->mdsc; spin_lock(&mdsc->dentry_list_lock); list_del_init(&di->lease_list); spin_unlock(&mdsc->dentry_list_lock);}
enum { KEEP = 0, DELETE = 1, TOUCH = 2, STOP = 4,};
struct ceph_lease_walk_control { bool dir_lease; bool expire_dir_lease; unsigned long nr_to_scan; unsigned long dir_lease_ttl;};
static int __dir_lease_check(const struct dentry *, struct ceph_lease_walk_control *);static int __dentry_lease_check(const struct dentry *);
static unsigned long__dentry_leases_walk(struct ceph_mds_client *mdsc, struct ceph_lease_walk_control *lwc){ struct ceph_dentry_info *di, *tmp; struct dentry *dentry, *last = NULL; struct list_head* list; LIST_HEAD(dispose); unsigned long freed = 0; int ret = 0;
list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases; spin_lock(&mdsc->dentry_list_lock); list_for_each_entry_safe(di, tmp, list, lease_list) { if (!lwc->nr_to_scan) break; --lwc->nr_to_scan;
dentry = di->dentry; if (last == dentry) break;
if (!spin_trylock(&dentry->d_lock)) continue;
if (__lockref_is_dead(&dentry->d_lockref)) { list_del_init(&di->lease_list); goto next; }
if (lwc->dir_lease) ret = __dir_lease_check(dentry, lwc); else ret = __dentry_lease_check(dentry); if (ret & TOUCH) { /* move it into tail of dir lease list */ __dentry_dir_lease_touch(mdsc, di); if (!last) last = dentry; } if (ret & DELETE) { /* stale lease */ di->flags &= ~CEPH_DENTRY_REFERENCED; if (dentry->d_lockref.count > 0) { /* update_dentry_lease() will re-add * it to lease list, or * ceph_d_delete() will return 1 when * last reference is dropped */ list_del_init(&di->lease_list); } else { di->flags |= CEPH_DENTRY_SHRINK_LIST; list_move_tail(&di->lease_list, &dispose); dget_dlock(dentry); } }next: spin_unlock(&dentry->d_lock); if (ret & STOP) break; } spin_unlock(&mdsc->dentry_list_lock);
while (!list_empty(&dispose)) { di = list_first_entry(&dispose, struct ceph_dentry_info, lease_list); dentry = di->dentry; spin_lock(&dentry->d_lock);
list_del_init(&di->lease_list); di->flags &= ~CEPH_DENTRY_SHRINK_LIST; if (di->flags & CEPH_DENTRY_REFERENCED) { spin_lock(&mdsc->dentry_list_lock); if (di->flags & CEPH_DENTRY_LEASE_LIST) { list_add_tail(&di->lease_list, &mdsc->dentry_leases); } else { __dentry_dir_lease_touch(mdsc, di); } spin_unlock(&mdsc->dentry_list_lock); } else { freed++; }
spin_unlock(&dentry->d_lock); /* ceph_d_delete() does the trick */ dput(dentry); } return freed;}
static int __dentry_lease_check(const struct dentry *dentry){ struct ceph_dentry_info *di = ceph_dentry(dentry); int ret;
if (__dentry_lease_is_valid(di)) return STOP; ret = __dir_lease_try_check(dentry); if (ret == -EBUSY) return KEEP; if (ret > 0) return TOUCH; return DELETE;}
static int __dir_lease_check(const struct dentry *dentry, struct ceph_lease_walk_control *lwc){ struct ceph_dentry_info *di = ceph_dentry(dentry);
int ret = __dir_lease_try_check(dentry); if (ret == -EBUSY) return KEEP; if (ret > 0) { if (time_before(jiffies, di->time + lwc->dir_lease_ttl)) return STOP; /* Move dentry to tail of dir lease list if we don't want * to delete it. So dentries in the list are checked in a * round robin manner */ if (!lwc->expire_dir_lease) return TOUCH; if (dentry->d_lockref.count > 0 || (di->flags & CEPH_DENTRY_REFERENCED)) return TOUCH; /* invalidate dir lease */ di->lease_shared_gen = 0; } return DELETE;}
int ceph_trim_dentries(struct ceph_mds_client *mdsc){ struct ceph_lease_walk_control lwc; unsigned long count; unsigned long freed;
spin_lock(&mdsc->caps_list_lock); if (mdsc->caps_use_max > 0 && mdsc->caps_use_count > mdsc->caps_use_max) count = mdsc->caps_use_count - mdsc->caps_use_max; else count = 0; spin_unlock(&mdsc->caps_list_lock);
lwc.dir_lease = false; lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2; freed = __dentry_leases_walk(mdsc, &lwc); if (!lwc.nr_to_scan) /* more invalid leases */ return -EAGAIN;
if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE) lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE;
lwc.dir_lease = true; lwc.expire_dir_lease = freed < count; lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ; freed +=__dentry_leases_walk(mdsc, &lwc); if (!lwc.nr_to_scan) /* more to check */ return -EAGAIN;
return freed > 0 ? 1 : 0;}
/* * Ensure a dentry lease will no longer revalidate. */void ceph_invalidate_dentry_lease(struct dentry *dentry){ struct ceph_dentry_info *di = ceph_dentry(dentry); spin_lock(&dentry->d_lock); di->time = jiffies; di->lease_shared_gen = 0; di->flags &= ~CEPH_DENTRY_PRIMARY_LINK; __dentry_lease_unlist(di); spin_unlock(&dentry->d_lock);}
/* * Check if dentry lease is valid. If not, delete the lease. Try to * renew if the least is more than half up. */static bool __dentry_lease_is_valid(struct ceph_dentry_info *di){ struct ceph_mds_session *session;
if (!di->lease_gen) return false;
session = di->lease_session; if (session) { u32 gen; unsigned long ttl;
gen = atomic_read(&session->s_cap_gen); ttl = session->s_cap_ttl;
if (di->lease_gen == gen && time_before(jiffies, ttl) && time_before(jiffies, di->time)) return true; } di->lease_gen = 0; return false;}
static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags){ struct ceph_dentry_info *di; struct ceph_mds_session *session = NULL; struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dentry->d_sb)->mdsc; struct ceph_client *cl = mdsc->fsc->client; u32 seq = 0; int valid = 0;
spin_lock(&dentry->d_lock); di = ceph_dentry(dentry); if (di && __dentry_lease_is_valid(di)) { valid = 1;
if (di->lease_renew_after && time_after(jiffies, di->lease_renew_after)) { /* * We should renew. If we're in RCU walk mode * though, we can't do that so just return * -ECHILD. */ if (flags & LOOKUP_RCU) { valid = -ECHILD; } else { session = ceph_get_mds_session(di->lease_session); seq = di->lease_seq; di->lease_renew_after = 0; di->lease_renew_from = jiffies; } } } spin_unlock(&dentry->d_lock);
if (session) { ceph_mdsc_lease_send_msg(session, dentry, CEPH_MDS_LEASE_RENEW, seq); ceph_put_mds_session(session); } doutc(cl, "dentry %p = %d\n", dentry, valid); return valid;}
/* * Called under dentry->d_lock. */static int __dir_lease_try_check(const struct dentry *dentry){ struct ceph_dentry_info *di = ceph_dentry(dentry); struct inode *dir; struct ceph_inode_info *ci; int valid = 0;
if (!di->lease_shared_gen) return 0; if (IS_ROOT(dentry)) return 0;
dir = d_inode(dentry->d_parent); ci = ceph_inode(dir);
if (spin_trylock(&ci->i_ceph_lock)) { if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen && __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0)) valid = 1; spin_unlock(&ci->i_ceph_lock); } else { valid = -EBUSY; }
if (!valid) di->lease_shared_gen = 0; return valid;}
/* * Check if directory-wide content lease/cap is valid. */static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry, struct ceph_mds_client *mdsc){ struct ceph_inode_info *ci = ceph_inode(dir); struct ceph_client *cl = mdsc->fsc->client; int valid; int shared_gen;
spin_lock(&ci->i_ceph_lock); valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); if (valid) { __ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); shared_gen = atomic_read(&ci->i_shared_gen); } spin_unlock(&ci->i_ceph_lock); if (valid) { struct ceph_dentry_info *di; spin_lock(&dentry->d_lock); di = ceph_dentry(dentry); if (dir == d_inode(dentry->d_parent) && di && di->lease_shared_gen == shared_gen) __ceph_dentry_dir_lease_touch(di); else valid = 0; spin_unlock(&dentry->d_lock); } doutc(cl, "dir %p %llx.%llx v%u dentry %p '%pd' = %d\n", dir, ceph_vinop(dir), (unsigned)atomic_read(&ci->i_shared_gen), dentry, dentry, valid); return valid;}
/* * Check if cached dentry can be trusted. */static int ceph_d_revalidate(struct inode *dir, const struct qstr *name, struct dentry *dentry, unsigned int flags){ struct ceph_mds_client *mdsc = ceph_sb_to_fs_client(dentry->d_sb)->mdsc; struct ceph_client *cl = mdsc->fsc->client; int valid = 0; struct inode *inode;
valid = fscrypt_d_revalidate(dir, name, dentry, flags); if (valid <= 0) return valid;
inode = d_inode_rcu(dentry);
doutc(cl, "%p '%pd' inode %p offset 0x%llx nokey %d\n", dentry, dentry, inode, ceph_dentry(dentry)->offset, !!(dentry->d_flags & DCACHE_NOKEY_NAME));
mdsc = ceph_sb_to_fs_client(dir->i_sb)->mdsc;
/* always trust cached snapped dentries, snapdir dentry */ if (ceph_snap(dir) != CEPH_NOSNAP) { doutc(cl, "%p '%pd' inode %p is SNAPPED\n", dentry, dentry, inode); valid = 1; } else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { valid = 1; } else { valid = dentry_lease_is_valid(dentry, flags); if (valid == -ECHILD) return valid; if (valid || dir_lease_is_valid(dir, dentry, mdsc)) { if (inode) valid = ceph_is_any_caps(inode); else valid = 1; } }
if (!valid) { struct ceph_mds_request *req; int op, err; u32 mask;
if (flags & LOOKUP_RCU) return -ECHILD;
percpu_counter_inc(&mdsc->metric.d_lease_mis);
op = ceph_snap(dir) == CEPH_SNAPDIR ? CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); if (!IS_ERR(req)) { req->r_dentry = dget(dentry); req->r_num_caps = 2; req->r_parent = dir; ihold(dir);
req->r_dname = name;
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; if (ceph_security_xattr_wanted(dir)) mask |= CEPH_CAP_XATTR_SHARED; req->r_args.getattr.mask = cpu_to_le32(mask);
err = ceph_mdsc_do_request(mdsc, NULL, req); switch (err) { case 0: if (d_really_is_positive(dentry) && d_inode(dentry) == req->r_target_inode) valid = 1; break; case -ENOENT: if (d_really_is_negative(dentry)) valid = 1; fallthrough; default: break; } ceph_mdsc_put_request(req); doutc(cl, "%p '%pd', lookup result=%d\n", dentry, dentry, err); } } else { percpu_counter_inc(&mdsc->metric.d_lease_hit); }
doutc(cl, "%p '%pd' %s\n", dentry, dentry, valid ? "valid" : "invalid"); if (!valid) ceph_dir_clear_complete(dir); return valid;}
/* * Delete unused dentry that doesn't have valid lease * * Called under dentry->d_lock. */static int ceph_d_delete(const struct dentry *dentry){ struct ceph_dentry_info *di;
/* won't release caps */ if (d_really_is_negative(dentry)) return 0; if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) return 0; /* valid lease? */ di = ceph_dentry(dentry); if (di) { if (__dentry_lease_is_valid(di)) return 0; if (__dir_lease_try_check(dentry)) return 0; } return 1;}
/* * Release our ceph_dentry_info. */static void ceph_d_release(struct dentry *dentry){ struct ceph_dentry_info *di = ceph_dentry(dentry); struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb);
doutc(fsc->client, "dentry %p '%pd'\n", dentry, dentry);
atomic64_dec(&fsc->mdsc->metric.total_dentries);
spin_lock(&dentry->d_lock); __dentry_lease_unlist(di); dentry->d_fsdata = NULL; spin_unlock(&dentry->d_lock);
ceph_put_mds_session(di->lease_session); kmem_cache_free(ceph_dentry_cachep, di);}
/* * When the VFS prunes a dentry from the cache, we need to clear the * complete flag on the parent directory. * * Called under dentry->d_lock. */static void ceph_d_prune(struct dentry *dentry){ struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb); struct ceph_client *cl = mdsc->fsc->client; struct ceph_inode_info *dir_ci; struct ceph_dentry_info *di;
doutc(cl, "dentry %p '%pd'\n", dentry, dentry);
/* do we have a valid parent? */ if (IS_ROOT(dentry)) return;
/* we hold d_lock, so d_parent is stable */ dir_ci = ceph_inode(d_inode(dentry->d_parent)); if (dir_ci->i_vino.snap == CEPH_SNAPDIR) return;
/* who calls d_delete() should also disable dcache readdir */ if (d_really_is_negative(dentry)) return;
/* d_fsdata does not get cleared until d_release */ if (!d_unhashed(dentry)) { __ceph_dir_clear_complete(dir_ci); return; }
/* Disable dcache readdir just in case that someone called d_drop() * or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED * properly (dcache readdir is still enabled) */ di = ceph_dentry(dentry); if (di->offset > 0 && di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen)) __ceph_dir_clear_ordered(dir_ci);}
/* * read() on a dir. This weird interface hack only works if mounted * with '-o dirstat'. */static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, loff_t *ppos){ struct ceph_dir_file_info *dfi = file->private_data; struct inode *inode = file_inode(file); struct ceph_inode_info *ci = ceph_inode(inode); int left; const int bufsize = 1024;
if (!ceph_test_mount_opt(ceph_sb_to_fs_client(inode->i_sb), DIRSTAT)) return -EISDIR;
if (!dfi->dir_info) { dfi->dir_info = kmalloc(bufsize, GFP_KERNEL); if (!dfi->dir_info) return -ENOMEM; dfi->dir_info_len = snprintf(dfi->dir_info, bufsize, "entries: %20lld\n" " files: %20lld\n" " subdirs: %20lld\n" "rentries: %20lld\n" " rfiles: %20lld\n" " rsubdirs: %20lld\n" "rbytes: %20lld\n" "rctime: %ptSp\n", ci->i_files + ci->i_subdirs, ci->i_files, ci->i_subdirs, ci->i_rfiles + ci->i_rsubdirs, ci->i_rfiles, ci->i_rsubdirs, ci->i_rbytes, &ci->i_rctime); }
if (*ppos >= dfi->dir_info_len) return 0; size = min_t(unsigned, size, dfi->dir_info_len-*ppos); left = copy_to_user(buf, dfi->dir_info + *ppos, size); if (left == size) return -EFAULT; *ppos += (size - left); return size - left;}
/* * Return name hash for a given dentry. This is dependent on * the parent directory's hash function. */unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn){ struct ceph_inode_info *dci = ceph_inode(dir); unsigned hash;
switch (dci->i_dir_layout.dl_dir_hash) { case 0: /* for backward compat */ case CEPH_STR_HASH_LINUX: return dn->d_name.hash;
default: spin_lock(&dn->d_lock); hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash, dn->d_name.name, dn->d_name.len); spin_unlock(&dn->d_lock); return hash; }}
WRAP_DIR_ITER(ceph_readdir) // FIXME!const struct file_operations ceph_dir_fops = { .read = ceph_read_dir, .iterate_shared = shared_ceph_readdir, .llseek = ceph_dir_llseek, .open = ceph_open, .release = ceph_release, .unlocked_ioctl = ceph_ioctl, .compat_ioctl = compat_ptr_ioctl, .fsync = ceph_fsync, .lock = ceph_lock, .flock = ceph_flock,};
const struct file_operations ceph_snapdir_fops = { .iterate_shared = shared_ceph_readdir, .llseek = ceph_dir_llseek, .open = ceph_open, .release = ceph_release,};
const struct inode_operations ceph_dir_iops = { .lookup = ceph_lookup, .permission = ceph_permission, .getattr = ceph_getattr, .setattr = ceph_setattr, .listxattr = ceph_listxattr, .get_inode_acl = ceph_get_acl, .set_acl = ceph_set_acl, .mknod = ceph_mknod, .symlink = ceph_symlink, .mkdir = ceph_mkdir, .link = ceph_link, .unlink = ceph_unlink, .rmdir = ceph_unlink, .rename = ceph_rename, .create = ceph_create, .atomic_open = ceph_atomic_open,};
const struct inode_operations ceph_snapdir_iops = { .lookup = ceph_lookup, .permission = ceph_permission, .getattr = ceph_getattr, .mkdir = ceph_mkdir, .rmdir = ceph_unlink, .rename = ceph_rename,};
const struct dentry_operations ceph_dentry_ops = { .d_revalidate = ceph_d_revalidate, .d_delete = ceph_d_delete, .d_release = ceph_d_release, .d_prune = ceph_d_prune, .d_init = ceph_d_init,};