diff --git a/include/sys/zfs_znode.h b/include/sys/zfs_znode.h index 8af5798ba8..0b75d52955 100644 --- a/include/sys/zfs_znode.h +++ b/include/sys/zfs_znode.h @@ -209,6 +209,7 @@ typedef struct znode { zfs_acl_t *z_acl_cached; /* cached acl */ krwlock_t z_xattr_lock; /* xattr data lock */ nvlist_t *z_xattr_cached;/* cached xattrs */ + struct znode *z_xattr_parent;/* xattr parent znode */ list_node_t z_link_node; /* all znodes in fs link */ sa_handle_t *z_sa_hdl; /* handle to sa data */ boolean_t z_is_sa; /* are we native sa? */ diff --git a/module/zfs/zfs_acl.c b/module/zfs/zfs_acl.c index 98c0019503..db6331ea59 100644 --- a/module/zfs/zfs_acl.c +++ b/module/zfs/zfs_acl.c @@ -2453,33 +2453,53 @@ zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr) { uint32_t working_mode; int error; - int is_attr; boolean_t check_privs; - znode_t *xzp; znode_t *check_zp = zp; mode_t needed_bits; uid_t owner; - is_attr = ((zp->z_pflags & ZFS_XATTR) && S_ISDIR(ZTOI(zp)->i_mode)); - /* * If attribute then validate against base file */ - if (is_attr) { + if ((zp->z_pflags & ZFS_XATTR) && S_ISDIR(ZTOI(zp)->i_mode)) { uint64_t parent; - if ((error = sa_lookup(zp->z_sa_hdl, - SA_ZPL_PARENT(ZTOZSB(zp)), &parent, - sizeof (parent))) != 0) - return (error); + rw_enter(&zp->z_xattr_lock, RW_READER); + if (zp->z_xattr_parent) { + check_zp = zp->z_xattr_parent; + rw_exit(&zp->z_xattr_lock); - if ((error = zfs_zget(ZTOZSB(zp), - parent, &xzp)) != 0) { - return (error); + /* + * Verify a lookup yields the same znode. + */ + ASSERT3S(sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT( + ZTOZSB(zp)), &parent, sizeof (parent)), ==, 0); + ASSERT3U(check_zp->z_id, ==, parent); + } else { + rw_exit(&zp->z_xattr_lock); + + error = sa_lookup(zp->z_sa_hdl, SA_ZPL_PARENT( + ZTOZSB(zp)), &parent, sizeof (parent)); + if (error) + return (error); + + /* + * Cache the lookup on the parent file znode as + * zp->z_xattr_parent and hold a reference. This + * effectively pins the parent in memory until all + * child xattr znodes have been destroyed and + * release their references in zfs_inode_destroy(). + */ + error = zfs_zget(ZTOZSB(zp), parent, &check_zp); + if (error) + return (error); + + rw_enter(&zp->z_xattr_lock, RW_WRITER); + if (zp->z_xattr_parent == NULL) + zp->z_xattr_parent = check_zp; + rw_exit(&zp->z_xattr_lock); } - check_zp = xzp; - /* * fixup mode to map to xattr perms */ @@ -2521,15 +2541,11 @@ zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr) if ((error = zfs_zaccess_common(check_zp, mode, &working_mode, &check_privs, skipaclchk, cr)) == 0) { - if (is_attr) - iput(ZTOI(xzp)); return (secpolicy_vnode_access2(cr, ZTOI(zp), owner, needed_bits, needed_bits)); } if (error && !check_privs) { - if (is_attr) - iput(ZTOI(xzp)); return (error); } @@ -2590,10 +2606,6 @@ zfs_zaccess(znode_t *zp, int mode, int flags, boolean_t skipaclchk, cred_t *cr) needed_bits, needed_bits); } - - if (is_attr) - iput(ZTOI(xzp)); - return (error); } diff --git a/module/zfs/zfs_znode.c b/module/zfs/zfs_znode.c index 885d224590..8074f1d008 100644 --- a/module/zfs/zfs_znode.c +++ b/module/zfs/zfs_znode.c @@ -116,6 +116,7 @@ zfs_znode_cache_constructor(void *buf, void *arg, int kmflags) zp->z_dirlocks = NULL; zp->z_acl_cached = NULL; zp->z_xattr_cached = NULL; + zp->z_xattr_parent = NULL; zp->z_moved = 0; return (0); } @@ -138,6 +139,7 @@ zfs_znode_cache_destructor(void *buf, void *arg) ASSERT(zp->z_dirlocks == NULL); ASSERT(zp->z_acl_cached == NULL); ASSERT(zp->z_xattr_cached == NULL); + ASSERT(zp->z_xattr_parent == NULL); } void @@ -286,6 +288,11 @@ zfs_inode_destroy(struct inode *ip) zp->z_xattr_cached = NULL; } + if (zp->z_xattr_parent) { + iput(ZTOI(zp->z_xattr_parent)); + zp->z_xattr_parent = NULL; + } + kmem_cache_free(znode_cache, zp); } @@ -359,6 +366,7 @@ zfs_znode_alloc(zfs_sb_t *zsb, dmu_buf_t *db, int blksz, ASSERT(zp->z_dirlocks == NULL); ASSERT3P(zp->z_acl_cached, ==, NULL); ASSERT3P(zp->z_xattr_cached, ==, NULL); + ASSERT3P(zp->z_xattr_parent, ==, NULL); zp->z_moved = 0; zp->z_sa_hdl = NULL; zp->z_unlinked = 0; @@ -394,6 +402,14 @@ zfs_znode_alloc(zfs_sb_t *zsb, dmu_buf_t *db, int blksz, goto error; } + /* + * xattr znodes hold a reference on their unique parent + */ + if (dip && zp->z_pflags & ZFS_XATTR) { + igrab(dip); + zp->z_xattr_parent = ITOZ(dip); + } + ip->i_ino = obj; zfs_inode_update(zp); zfs_inode_set_ops(zsb, ip); @@ -401,12 +417,8 @@ zfs_znode_alloc(zfs_sb_t *zsb, dmu_buf_t *db, int blksz, if (insert_inode_locked(ip)) goto error; - if (dentry) { - if (zpl_xattr_security_init(ip, dip, &dentry->d_name)) - goto error; - + if (dentry) d_instantiate(dentry, ip); - } mutex_enter(&zsb->z_znodes_lock); list_insert_tail(&zsb->z_all_znodes, zp); diff --git a/module/zfs/zpl_inode.c b/module/zfs/zpl_inode.c index bb389f8375..6175c2e93f 100644 --- a/module/zfs/zpl_inode.c +++ b/module/zfs/zpl_inode.c @@ -92,8 +92,12 @@ zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode, vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP); zpl_vap_init(vap, dir, dentry, mode, cr); - error = -zfs_create(dir, (char *)dentry->d_name.name, - vap, 0, mode, &ip, cr, 0, NULL); + error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL); + if (error == 0) { + error = zpl_xattr_security_init(ip, dir, &dentry->d_name); + VERIFY3S(error, ==, 0); + } + kmem_free(vap, sizeof(vattr_t)); crfree(cr); ASSERT3S(error, <=, 0);