On Mon, Aug 31, 2020 at 5:30 PM Sasha Levin <sashal@xxxxxxxxxx> wrote: > > From: Jeff Layton <jlayton@xxxxxxxxxx> > > [ Upstream commit ebce3eb2f7ef9f6ef01a60874ebd232450107c9a ] > > Tuan and Ulrich mentioned that they were hitting a problem on s390x, > which has a 32-bit ino_t value, even though it's a 64-bit arch (for > historical reasons). > > I think the current handling of inode numbers in the ceph driver is > wrong. It tries to use 32-bit inode numbers on 32-bit arches, but that's > actually not a problem. 32-bit arches can deal with 64-bit inode numbers > just fine when userland code is compiled with LFS support (the common > case these days). > > What we really want to do is just use 64-bit numbers everywhere, unless > someone has mounted with the ino32 mount option. In that case, we want > to ensure that we hash the inode number down to something that will fit > in 32 bits before presenting the value to userland. > > Add new helper functions that do this, and only do the conversion before > presenting these values to userland in getattr and readdir. > > The inode table hashvalue is changed to just cast the inode number to > unsigned long, as low-order bits are the most likely to vary anyway. > > While it's not strictly required, we do want to put something in > inode->i_ino. Instead of basing it on BITS_PER_LONG, however, base it on > the size of the ino_t type. > > NOTE: This is a user-visible change on 32-bit arches: > > 1/ inode numbers will be seen to have changed between kernel versions. > 32-bit arches will see large inode numbers now instead of the hashed > ones they saw before. > > 2/ any really old software not built with LFS support may start failing > stat() calls with -EOVERFLOW on inode numbers >2^32. Nothing much we > can do about these, but hopefully the intersection of people running > such code on ceph will be very small. > > The workaround for both problems is to mount with "-o ino32". > > [ idryomov: changelog tweak ] > > URL: https://tracker.ceph.com/issues/46828 > Reported-by: Ulrich Weigand <Ulrich.Weigand@xxxxxxxxxx> > Reported-and-Tested-by: Tuan Hoang1 <Tuan.Hoang1@xxxxxxx> > Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx> > Reviewed-by: "Yan, Zheng" <zyan@xxxxxxxxxx> > Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx> > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> > --- > fs/ceph/caps.c | 14 ++++----- > fs/ceph/debugfs.c | 4 +-- > fs/ceph/dir.c | 31 ++++++++----------- > fs/ceph/file.c | 4 +-- > fs/ceph/inode.c | 19 ++++++------ > fs/ceph/mds_client.h | 2 +- > fs/ceph/quota.c | 4 +-- > fs/ceph/super.h | 73 +++++++++++++++++++++++--------------------- > 8 files changed, 74 insertions(+), 77 deletions(-) > > diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c > index 972c13aa42259..1206a481c5fc7 100644 > --- a/fs/ceph/caps.c > +++ b/fs/ceph/caps.c > @@ -886,8 +886,8 @@ int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) > int have = ci->i_snap_caps; > > if ((have & mask) == mask) { > - dout("__ceph_caps_issued_mask ino 0x%lx snap issued %s" > - " (mask %s)\n", ci->vfs_inode.i_ino, > + dout("__ceph_caps_issued_mask ino 0x%llx snap issued %s" > + " (mask %s)\n", ceph_ino(&ci->vfs_inode), > ceph_cap_string(have), > ceph_cap_string(mask)); > return 1; > @@ -898,8 +898,8 @@ int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) > if (!__cap_is_valid(cap)) > continue; > if ((cap->issued & mask) == mask) { > - dout("__ceph_caps_issued_mask ino 0x%lx cap %p issued %s" > - " (mask %s)\n", ci->vfs_inode.i_ino, cap, > + dout("__ceph_caps_issued_mask ino 0x%llx cap %p issued %s" > + " (mask %s)\n", ceph_ino(&ci->vfs_inode), cap, > ceph_cap_string(cap->issued), > ceph_cap_string(mask)); > if (touch) > @@ -910,8 +910,8 @@ int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) > /* does a combination of caps satisfy mask? */ > have |= cap->issued; > if ((have & mask) == mask) { > - dout("__ceph_caps_issued_mask ino 0x%lx combo issued %s" > - " (mask %s)\n", ci->vfs_inode.i_ino, > + dout("__ceph_caps_issued_mask ino 0x%llx combo issued %s" > + " (mask %s)\n", ceph_ino(&ci->vfs_inode), > ceph_cap_string(cap->issued), > ceph_cap_string(mask)); > if (touch) { > @@ -2870,7 +2870,7 @@ int ceph_get_caps(struct file *filp, int need, int want, > struct cap_wait cw; > DEFINE_WAIT_FUNC(wait, woken_wake_function); > > - cw.ino = inode->i_ino; > + cw.ino = ceph_ino(inode); > cw.tgid = current->tgid; > cw.need = need; > cw.want = want; > diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c > index 070ed84813406..74747d8d48619 100644 > --- a/fs/ceph/debugfs.c > +++ b/fs/ceph/debugfs.c > @@ -212,7 +212,7 @@ static int caps_show_cb(struct inode *inode, struct ceph_cap *cap, void *p) > { > struct seq_file *s = p; > > - seq_printf(s, "0x%-17lx%-17s%-17s\n", inode->i_ino, > + seq_printf(s, "0x%-17llx%-17s%-17s\n", ceph_ino(inode), > ceph_cap_string(cap->issued), > ceph_cap_string(cap->implemented)); > return 0; > @@ -257,7 +257,7 @@ static int caps_show(struct seq_file *s, void *p) > > spin_lock(&mdsc->caps_list_lock); > list_for_each_entry(cw, &mdsc->cap_wait_list, list) { > - seq_printf(s, "%-13d0x%-17lx%-17s%-17s\n", cw->tgid, cw->ino, > + seq_printf(s, "%-13d0x%-17llx%-17s%-17s\n", cw->tgid, cw->ino, > ceph_cap_string(cw->need), > ceph_cap_string(cw->want)); > } > diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c > index 060bdcc5ce32c..040eaad9d0631 100644 > --- a/fs/ceph/dir.c > +++ b/fs/ceph/dir.c > @@ -259,9 +259,7 @@ static int __dcache_readdir(struct file *file, struct dir_context *ctx, > dentry, dentry, d_inode(dentry)); > ctx->pos = di->offset; > if (!dir_emit(ctx, dentry->d_name.name, > - dentry->d_name.len, > - ceph_translate_ino(dentry->d_sb, > - d_inode(dentry)->i_ino), > + dentry->d_name.len, ceph_present_inode(d_inode(dentry)), > d_inode(dentry)->i_mode >> 12)) { > dput(dentry); > err = 0; > @@ -324,18 +322,21 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) > /* always start with . and .. */ > if (ctx->pos == 0) { > dout("readdir off 0 -> '.'\n"); > - if (!dir_emit(ctx, ".", 1, > - ceph_translate_ino(inode->i_sb, inode->i_ino), > + if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode), > inode->i_mode >> 12)) > return 0; > ctx->pos = 1; > } > if (ctx->pos == 1) { > - ino_t ino = parent_ino(file->f_path.dentry); > + 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); > + > dout("readdir off 1 -> '..'\n"); > - if (!dir_emit(ctx, "..", 2, > - ceph_translate_ino(inode->i_sb, ino), > - inode->i_mode >> 12)) > + if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12)) > return 0; > ctx->pos = 2; > } > @@ -507,9 +508,6 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) > } > for (; i < rinfo->dir_nr; i++) { > struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; > - struct ceph_vino vino; > - ino_t ino; > - u32 ftype; > > BUG_ON(rde->offset < ctx->pos); > > @@ -519,13 +517,10 @@ static int ceph_readdir(struct file *file, struct dir_context *ctx) > rde->name_len, rde->name, &rde->inode.in); > > BUG_ON(!rde->inode.in); > - ftype = le32_to_cpu(rde->inode.in->mode) >> 12; > - vino.ino = le64_to_cpu(rde->inode.in->ino); > - vino.snap = le64_to_cpu(rde->inode.in->snapid); > - ino = ceph_vino_to_ino(vino); > > if (!dir_emit(ctx, rde->name, rde->name_len, > - ceph_translate_ino(inode->i_sb, ino), ftype)) { > + ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)), > + le32_to_cpu(rde->inode.in->mode) >> 12)) { > dout("filldir stopping us...\n"); > return 0; > } > @@ -1161,7 +1156,7 @@ static int ceph_unlink(struct inode *dir, struct dentry *dentry) > > if (try_async && op == CEPH_MDS_OP_UNLINK && > (req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) { > - dout("async unlink on %lu/%.*s caps=%s", dir->i_ino, > + dout("async unlink on %llu/%.*s caps=%s", ceph_ino(dir), > dentry->d_name.len, dentry->d_name.name, > ceph_cap_string(req->r_dir_caps)); > set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags); > diff --git a/fs/ceph/file.c b/fs/ceph/file.c > index 160644ddaeed7..26172bb90a459 100644 > --- a/fs/ceph/file.c > +++ b/fs/ceph/file.c > @@ -630,8 +630,8 @@ static int ceph_finish_async_create(struct inode *dir, struct dentry *dentry, > } else { > struct dentry *dn; > > - dout("%s d_adding new inode 0x%llx to 0x%lx/%s\n", __func__, > - vino.ino, dir->i_ino, dentry->d_name.name); > + dout("%s d_adding new inode 0x%llx to 0x%llx/%s\n", __func__, > + vino.ino, ceph_ino(dir), dentry->d_name.name); > ceph_dir_clear_ordered(dir); > ceph_init_inode_acls(inode, as_ctx); > if (inode->i_state & I_NEW) { > diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c > index 357c937699d56..d163fa96cb401 100644 > --- a/fs/ceph/inode.c > +++ b/fs/ceph/inode.c > @@ -41,8 +41,10 @@ static void ceph_inode_work(struct work_struct *work); > */ > static int ceph_set_ino_cb(struct inode *inode, void *data) > { > - ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; > - inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); > + struct ceph_inode_info *ci = ceph_inode(inode); > + > + ci->i_vino = *(struct ceph_vino *)data; > + inode->i_ino = ceph_vino_to_ino_t(ci->i_vino); > inode_set_iversion_raw(inode, 0); > return 0; > } > @@ -50,17 +52,14 @@ static int ceph_set_ino_cb(struct inode *inode, void *data) > struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino) > { > struct inode *inode; > - ino_t t = ceph_vino_to_ino(vino); > > - inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino); > + inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare, > + ceph_set_ino_cb, &vino); > if (!inode) > return ERR_PTR(-ENOMEM); > - if (inode->i_state & I_NEW) > - dout("get_inode created new inode %p %llx.%llx ino %llx\n", > - inode, ceph_vinop(inode), (u64)inode->i_ino); > > - dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino, > - vino.snap, inode); > + 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; > } > > @@ -2378,7 +2377,7 @@ int ceph_getattr(const struct path *path, struct kstat *stat, > } > > generic_fillattr(inode, stat); > - stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino); > + stat->ino = ceph_present_inode(inode); > > /* > * btime on newly-allocated inodes is 0, so if this is still set to > diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h > index 5e0c4073a6bea..63c9cd1c28d6c 100644 > --- a/fs/ceph/mds_client.h > +++ b/fs/ceph/mds_client.h > @@ -369,7 +369,7 @@ struct ceph_quotarealm_inode { > > struct cap_wait { > struct list_head list; > - unsigned long ino; > + u64 ino; > pid_t tgid; > int need; > int want; > diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c > index 198ddde5c1e6a..cc2c4d40b0222 100644 > --- a/fs/ceph/quota.c > +++ b/fs/ceph/quota.c > @@ -23,12 +23,12 @@ static inline bool ceph_has_realms_with_quotas(struct inode *inode) > { > struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; > struct super_block *sb = mdsc->fsc->sb; > + struct inode *root = d_inode(sb->s_root); > > if (atomic64_read(&mdsc->quotarealms_count) > 0) > return true; > /* if root is the real CephFS root, we don't have quota realms */ > - if (sb->s_root->d_inode && > - (sb->s_root->d_inode->i_ino == CEPH_INO_ROOT)) > + if (root && ceph_ino(root) == CEPH_INO_ROOT) > return false; > /* otherwise, we can't know for sure */ > return true; > diff --git a/fs/ceph/super.h b/fs/ceph/super.h > index 5a6cdd39bc103..2af3e06a6d0ce 100644 > --- a/fs/ceph/super.h > +++ b/fs/ceph/super.h > @@ -457,15 +457,7 @@ ceph_vino(const struct inode *inode) > return ceph_inode(inode)->i_vino; > } > > -/* > - * ino_t is <64 bits on many architectures, blech. > - * > - * i_ino (kernel inode) st_ino (userspace) > - * i386 32 32 > - * x86_64+ino32 64 32 > - * x86_64 64 64 > - */ > -static inline u32 ceph_ino_to_ino32(__u64 vino) > +static inline u32 ceph_ino_to_ino32(u64 vino) > { > u32 ino = vino & 0xffffffff; > ino ^= vino >> 32; > @@ -475,34 +467,17 @@ static inline u32 ceph_ino_to_ino32(__u64 vino) > } > > /* > - * kernel i_ino value > + * Inode numbers in cephfs are 64 bits, but inode->i_ino is 32-bits on > + * some arches. We generally do not use this value inside the ceph driver, but > + * we do want to set it to something, so that generic vfs code has an > + * appropriate value for tracepoints and the like. > */ > -static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) > +static inline ino_t ceph_vino_to_ino_t(struct ceph_vino vino) > { > -#if BITS_PER_LONG == 32 > - return ceph_ino_to_ino32(vino.ino); > -#else > + if (sizeof(ino_t) == sizeof(u32)) > + return ceph_ino_to_ino32(vino.ino); > return (ino_t)vino.ino; > -#endif > -} > - > -/* > - * user-visible ino (stat, filldir) > - */ > -#if BITS_PER_LONG == 32 > -static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) > -{ > - return ino; > -} > -#else > -static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) > -{ > - if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) > - ino = ceph_ino_to_ino32(ino); > - return ino; > } > -#endif > - > > /* for printf-style formatting */ > #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap > @@ -511,11 +486,34 @@ static inline u64 ceph_ino(struct inode *inode) > { > return ceph_inode(inode)->i_vino.ino; > } > + > static inline u64 ceph_snap(struct inode *inode) > { > return ceph_inode(inode)->i_vino.snap; > } > > +/** > + * ceph_present_ino - format an inode number for presentation to userland > + * @sb: superblock where the inode lives > + * @ino: inode number to (possibly) convert > + * > + * If the user mounted with the ino32 option, then the 64-bit value needs > + * to be converted to something that can fit inside 32 bits. Note that > + * internal kernel code never uses this value, so this is entirely for > + * userland consumption. > + */ > +static inline u64 ceph_present_ino(struct super_block *sb, u64 ino) > +{ > + if (unlikely(ceph_test_mount_opt(ceph_sb_to_client(sb), INO32))) > + return ceph_ino_to_ino32(ino); > + return ino; > +} > + > +static inline u64 ceph_present_inode(struct inode *inode) > +{ > + return ceph_present_ino(inode->i_sb, ceph_ino(inode)); > +} > + > static inline int ceph_ino_compare(struct inode *inode, void *data) > { > struct ceph_vino *pvino = (struct ceph_vino *)data; > @@ -524,11 +522,16 @@ static inline int ceph_ino_compare(struct inode *inode, void *data) > ci->i_vino.snap == pvino->snap; > } > > + > static inline struct inode *ceph_find_inode(struct super_block *sb, > struct ceph_vino vino) > { > - ino_t t = ceph_vino_to_ino(vino); > - return ilookup5(sb, t, ceph_ino_compare, &vino); > + /* > + * NB: The hashval will be run through the fs/inode.c hash function > + * anyway, so there is no need to squash the inode number down to > + * 32-bits first. Just use low-order bits on arches with 32-bit long. > + */ > + return ilookup5(sb, (unsigned long)vino.ino, ceph_ino_compare, &vino); > } > > > -- > 2.25.1 Hi Sasha, This is a user-visible change and wasn't marked for stable for that reason. Please drop it. Thanks, Ilya
