diff options
Diffstat (limited to 'fs/ceph/xattr.c')
| -rw-r--r-- | fs/ceph/xattr.c | 1306 |
1 files changed, 1306 insertions, 0 deletions
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c new file mode 100644 index 000000000..76322c0f6 --- /dev/null +++ b/fs/ceph/xattr.c @@ -0,0 +1,1306 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/ceph/ceph_debug.h> +#include <linux/ceph/pagelist.h> + +#include "super.h" +#include "mds_client.h" + +#include <linux/ceph/decode.h> + +#include <linux/xattr.h> +#include <linux/security.h> +#include <linux/posix_acl_xattr.h> +#include <linux/slab.h> + +#define XATTR_CEPH_PREFIX "ceph." +#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1) + +static int __remove_xattr(struct ceph_inode_info *ci, + struct ceph_inode_xattr *xattr); + +static bool ceph_is_valid_xattr(const char *name) +{ + return !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) || + !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) || + !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) || + !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); +} + +/* + * These define virtual xattrs exposing the recursive directory + * statistics and layout metadata. + */ +struct ceph_vxattr { + char *name; + size_t name_size; /* strlen(name) + 1 (for '\0') */ + ssize_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val, + size_t size); + bool (*exists_cb)(struct ceph_inode_info *ci); + unsigned int flags; +}; + +#define VXATTR_FLAG_READONLY (1<<0) +#define VXATTR_FLAG_HIDDEN (1<<1) +#define VXATTR_FLAG_RSTAT (1<<2) + +/* layouts */ + +static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci) +{ + struct ceph_file_layout *fl = &ci->i_layout; + return (fl->stripe_unit > 0 || fl->stripe_count > 0 || + fl->object_size > 0 || fl->pool_id >= 0 || + rcu_dereference_raw(fl->pool_ns) != NULL); +} + +static ssize_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, + size_t size) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb); + struct ceph_osd_client *osdc = &fsc->client->osdc; + struct ceph_string *pool_ns; + s64 pool = ci->i_layout.pool_id; + const char *pool_name; + const char *ns_field = " pool_namespace="; + char buf[128]; + size_t len, total_len = 0; + ssize_t ret; + + pool_ns = ceph_try_get_string(ci->i_layout.pool_ns); + + dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode); + down_read(&osdc->lock); + pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); + if (pool_name) { + len = snprintf(buf, sizeof(buf), + "stripe_unit=%u stripe_count=%u object_size=%u pool=", + ci->i_layout.stripe_unit, ci->i_layout.stripe_count, + ci->i_layout.object_size); + total_len = len + strlen(pool_name); + } else { + len = snprintf(buf, sizeof(buf), + "stripe_unit=%u stripe_count=%u object_size=%u pool=%lld", + ci->i_layout.stripe_unit, ci->i_layout.stripe_count, + ci->i_layout.object_size, pool); + total_len = len; + } + + if (pool_ns) + total_len += strlen(ns_field) + pool_ns->len; + + ret = total_len; + if (size >= total_len) { + memcpy(val, buf, len); + ret = len; + if (pool_name) { + len = strlen(pool_name); + memcpy(val + ret, pool_name, len); + ret += len; + } + if (pool_ns) { + len = strlen(ns_field); + memcpy(val + ret, ns_field, len); + ret += len; + memcpy(val + ret, pool_ns->str, pool_ns->len); + ret += pool_ns->len; + } + } + up_read(&osdc->lock); + ceph_put_string(pool_ns); + return ret; +} + +/* + * The convention with strings in xattrs is that they should not be NULL + * terminated, since we're returning the length with them. snprintf always + * NULL terminates however, so call it on a temporary buffer and then memcpy + * the result into place. + */ +static __printf(3, 4) +int ceph_fmt_xattr(char *val, size_t size, const char *fmt, ...) +{ + int ret; + va_list args; + char buf[96]; /* NB: reevaluate size if new vxattrs are added */ + + va_start(args, fmt); + ret = vsnprintf(buf, size ? sizeof(buf) : 0, fmt, args); + va_end(args); + + /* Sanity check */ + if (size && ret + 1 > sizeof(buf)) { + WARN_ONCE(true, "Returned length too big (%d)", ret); + return -E2BIG; + } + + if (ret <= size) + memcpy(val, buf, ret); + return ret; +} + +static ssize_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci, + char *val, size_t size) +{ + return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_unit); +} + +static ssize_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci, + char *val, size_t size) +{ + return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_count); +} + +static ssize_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci, + char *val, size_t size) +{ + return ceph_fmt_xattr(val, size, "%u", ci->i_layout.object_size); +} + +static ssize_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci, + char *val, size_t size) +{ + ssize_t ret; + struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb); + struct ceph_osd_client *osdc = &fsc->client->osdc; + s64 pool = ci->i_layout.pool_id; + const char *pool_name; + + down_read(&osdc->lock); + pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); + if (pool_name) { + ret = strlen(pool_name); + if (ret <= size) + memcpy(val, pool_name, ret); + } else { + ret = ceph_fmt_xattr(val, size, "%lld", pool); + } + up_read(&osdc->lock); + return ret; +} + +static ssize_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci, + char *val, size_t size) +{ + ssize_t ret = 0; + struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns); + + if (ns) { + ret = ns->len; + if (ret <= size) + memcpy(val, ns->str, ret); + ceph_put_string(ns); + } + return ret; +} + +/* directories */ + +static ssize_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%lld", ci->i_files + ci->i_subdirs); +} + +static ssize_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%lld", ci->i_files); +} + +static ssize_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%lld", ci->i_subdirs); +} + +static ssize_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%lld", + ci->i_rfiles + ci->i_rsubdirs); +} + +static ssize_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%lld", ci->i_rfiles); +} + +static ssize_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%lld", ci->i_rsubdirs); +} + +static ssize_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%lld", ci->i_rbytes); +} + +static ssize_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_rctime.tv_sec, + ci->i_rctime.tv_nsec); +} + +/* dir pin */ +static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci) +{ + return ci->i_dir_pin != -ENODATA; +} + +static ssize_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%d", (int)ci->i_dir_pin); +} + +/* quotas */ +static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci) +{ + bool ret = false; + spin_lock(&ci->i_ceph_lock); + if ((ci->i_max_files || ci->i_max_bytes) && + ci->i_vino.snap == CEPH_NOSNAP && + ci->i_snap_realm && + ci->i_snap_realm->ino == ci->i_vino.ino) + ret = true; + spin_unlock(&ci->i_ceph_lock); + return ret; +} + +static ssize_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "max_bytes=%llu max_files=%llu", + ci->i_max_bytes, ci->i_max_files); +} + +static ssize_t ceph_vxattrcb_quota_max_bytes(struct ceph_inode_info *ci, + char *val, size_t size) +{ + return ceph_fmt_xattr(val, size, "%llu", ci->i_max_bytes); +} + +static ssize_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci, + char *val, size_t size) +{ + return ceph_fmt_xattr(val, size, "%llu", ci->i_max_files); +} + +/* snapshots */ +static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci) +{ + return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0); +} + +static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val, + size_t size) +{ + return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec, + ci->i_snap_btime.tv_nsec); +} + +#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name +#define CEPH_XATTR_NAME2(_type, _name, _name2) \ + XATTR_CEPH_PREFIX #_type "." #_name "." #_name2 + +#define XATTR_NAME_CEPH(_type, _name, _flags) \ + { \ + .name = CEPH_XATTR_NAME(_type, _name), \ + .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ + .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ + .exists_cb = NULL, \ + .flags = (VXATTR_FLAG_READONLY | _flags), \ + } +#define XATTR_RSTAT_FIELD(_type, _name) \ + XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT) +#define XATTR_RSTAT_FIELD_UPDATABLE(_type, _name) \ + { \ + .name = CEPH_XATTR_NAME(_type, _name), \ + .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ + .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ + .exists_cb = NULL, \ + .flags = VXATTR_FLAG_RSTAT, \ + } +#define XATTR_LAYOUT_FIELD(_type, _name, _field) \ + { \ + .name = CEPH_XATTR_NAME2(_type, _name, _field), \ + .name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \ + .getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \ + .exists_cb = ceph_vxattrcb_layout_exists, \ + .flags = VXATTR_FLAG_HIDDEN, \ + } +#define XATTR_QUOTA_FIELD(_type, _name) \ + { \ + .name = CEPH_XATTR_NAME(_type, _name), \ + .name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \ + .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ + .exists_cb = ceph_vxattrcb_quota_exists, \ + .flags = VXATTR_FLAG_HIDDEN, \ + } + +static struct ceph_vxattr ceph_dir_vxattrs[] = { + { + .name = "ceph.dir.layout", + .name_size = sizeof("ceph.dir.layout"), + .getxattr_cb = ceph_vxattrcb_layout, + .exists_cb = ceph_vxattrcb_layout_exists, + .flags = VXATTR_FLAG_HIDDEN, + }, + XATTR_LAYOUT_FIELD(dir, layout, stripe_unit), + XATTR_LAYOUT_FIELD(dir, layout, stripe_count), + XATTR_LAYOUT_FIELD(dir, layout, object_size), + XATTR_LAYOUT_FIELD(dir, layout, pool), + XATTR_LAYOUT_FIELD(dir, layout, pool_namespace), + XATTR_NAME_CEPH(dir, entries, 0), + XATTR_NAME_CEPH(dir, files, 0), + XATTR_NAME_CEPH(dir, subdirs, 0), + XATTR_RSTAT_FIELD(dir, rentries), + XATTR_RSTAT_FIELD(dir, rfiles), + XATTR_RSTAT_FIELD(dir, rsubdirs), + XATTR_RSTAT_FIELD(dir, rbytes), + XATTR_RSTAT_FIELD_UPDATABLE(dir, rctime), + { + .name = "ceph.dir.pin", + .name_size = sizeof("ceph.dir.pin"), + .getxattr_cb = ceph_vxattrcb_dir_pin, + .exists_cb = ceph_vxattrcb_dir_pin_exists, + .flags = VXATTR_FLAG_HIDDEN, + }, + { + .name = "ceph.quota", + .name_size = sizeof("ceph.quota"), + .getxattr_cb = ceph_vxattrcb_quota, + .exists_cb = ceph_vxattrcb_quota_exists, + .flags = VXATTR_FLAG_HIDDEN, + }, + XATTR_QUOTA_FIELD(quota, max_bytes), + XATTR_QUOTA_FIELD(quota, max_files), + { + .name = "ceph.snap.btime", + .name_size = sizeof("ceph.snap.btime"), + .getxattr_cb = ceph_vxattrcb_snap_btime, + .exists_cb = ceph_vxattrcb_snap_btime_exists, + .flags = VXATTR_FLAG_READONLY, + }, + { .name = NULL, 0 } /* Required table terminator */ +}; + +/* files */ + +static struct ceph_vxattr ceph_file_vxattrs[] = { + { + .name = "ceph.file.layout", + .name_size = sizeof("ceph.file.layout"), + .getxattr_cb = ceph_vxattrcb_layout, + .exists_cb = ceph_vxattrcb_layout_exists, + .flags = VXATTR_FLAG_HIDDEN, + }, + XATTR_LAYOUT_FIELD(file, layout, stripe_unit), + XATTR_LAYOUT_FIELD(file, layout, stripe_count), + XATTR_LAYOUT_FIELD(file, layout, object_size), + XATTR_LAYOUT_FIELD(file, layout, pool), + XATTR_LAYOUT_FIELD(file, layout, pool_namespace), + { + .name = "ceph.snap.btime", + .name_size = sizeof("ceph.snap.btime"), + .getxattr_cb = ceph_vxattrcb_snap_btime, + .exists_cb = ceph_vxattrcb_snap_btime_exists, + .flags = VXATTR_FLAG_READONLY, + }, + { .name = NULL, 0 } /* Required table terminator */ +}; + +static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode) +{ + if (S_ISDIR(inode->i_mode)) + return ceph_dir_vxattrs; + else if (S_ISREG(inode->i_mode)) + return ceph_file_vxattrs; + return NULL; +} + +static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode, + const char *name) +{ + struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode); + + if (vxattr) { + while (vxattr->name) { + if (!strcmp(vxattr->name, name)) + return vxattr; + vxattr++; + } + } + + return NULL; +} + +static int __set_xattr(struct ceph_inode_info *ci, + const char *name, int name_len, + const char *val, int val_len, + int flags, int update_xattr, + struct ceph_inode_xattr **newxattr) +{ + struct rb_node **p; + struct rb_node *parent = NULL; + struct ceph_inode_xattr *xattr = NULL; + int c; + int new = 0; + + p = &ci->i_xattrs.index.rb_node; + while (*p) { + parent = *p; + xattr = rb_entry(parent, struct ceph_inode_xattr, node); + c = strncmp(name, xattr->name, min(name_len, xattr->name_len)); + if (c < 0) + p = &(*p)->rb_left; + else if (c > 0) + p = &(*p)->rb_right; + else { + if (name_len == xattr->name_len) + break; + else if (name_len < xattr->name_len) + p = &(*p)->rb_left; + else + p = &(*p)->rb_right; + } + xattr = NULL; + } + + if (update_xattr) { + int err = 0; + + if (xattr && (flags & XATTR_CREATE)) + err = -EEXIST; + else if (!xattr && (flags & XATTR_REPLACE)) + err = -ENODATA; + if (err) { + kfree(name); + kfree(val); + kfree(*newxattr); + return err; + } + if (update_xattr < 0) { + if (xattr) + __remove_xattr(ci, xattr); + kfree(name); + kfree(*newxattr); + return 0; + } + } + + if (!xattr) { + new = 1; + xattr = *newxattr; + xattr->name = name; + xattr->name_len = name_len; + xattr->should_free_name = update_xattr; + + ci->i_xattrs.count++; + dout("__set_xattr count=%d\n", ci->i_xattrs.count); + } else { + kfree(*newxattr); + *newxattr = NULL; + if (xattr->should_free_val) + kfree(xattr->val); + + if (update_xattr) { + kfree(name); + name = xattr->name; + } + ci->i_xattrs.names_size -= xattr->name_len; + ci->i_xattrs.vals_size -= xattr->val_len; + } + ci->i_xattrs.names_size += name_len; + ci->i_xattrs.vals_size += val_len; + if (val) + xattr->val = val; + else + xattr->val = ""; + + xattr->val_len = val_len; + xattr->dirty = update_xattr; + xattr->should_free_val = (val && update_xattr); + + if (new) { + rb_link_node(&xattr->node, parent, p); + rb_insert_color(&xattr->node, &ci->i_xattrs.index); + dout("__set_xattr_val p=%p\n", p); + } + + dout("__set_xattr_val added %llx.%llx xattr %p %.*s=%.*s\n", + ceph_vinop(&ci->vfs_inode), xattr, name_len, name, val_len, val); + + return 0; +} + +static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci, + const char *name) +{ + struct rb_node **p; + struct rb_node *parent = NULL; + struct ceph_inode_xattr *xattr = NULL; + int name_len = strlen(name); + int c; + + p = &ci->i_xattrs.index.rb_node; + while (*p) { + parent = *p; + xattr = rb_entry(parent, struct ceph_inode_xattr, node); + c = strncmp(name, xattr->name, xattr->name_len); + if (c == 0 && name_len > xattr->name_len) + c = 1; + if (c < 0) + p = &(*p)->rb_left; + else if (c > 0) + p = &(*p)->rb_right; + else { + dout("__get_xattr %s: found %.*s\n", name, + xattr->val_len, xattr->val); + return xattr; + } + } + + dout("__get_xattr %s: not found\n", name); + + return NULL; +} + +static void __free_xattr(struct ceph_inode_xattr *xattr) +{ + BUG_ON(!xattr); + + if (xattr->should_free_name) + kfree(xattr->name); + if (xattr->should_free_val) + kfree(xattr->val); + + kfree(xattr); +} + +static int __remove_xattr(struct ceph_inode_info *ci, + struct ceph_inode_xattr *xattr) +{ + if (!xattr) + return -ENODATA; + + rb_erase(&xattr->node, &ci->i_xattrs.index); + + if (xattr->should_free_name) + kfree(xattr->name); + if (xattr->should_free_val) + kfree(xattr->val); + + ci->i_xattrs.names_size -= xattr->name_len; + ci->i_xattrs.vals_size -= xattr->val_len; + ci->i_xattrs.count--; + kfree(xattr); + + return 0; +} + +static char *__copy_xattr_names(struct ceph_inode_info *ci, + char *dest) +{ + struct rb_node *p; + struct ceph_inode_xattr *xattr = NULL; + + p = rb_first(&ci->i_xattrs.index); + dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count); + + while (p) { + xattr = rb_entry(p, struct ceph_inode_xattr, node); + memcpy(dest, xattr->name, xattr->name_len); + dest[xattr->name_len] = '\0'; + + dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name, + xattr->name_len, ci->i_xattrs.names_size); + + dest += xattr->name_len + 1; + p = rb_next(p); + } + + return dest; +} + +void __ceph_destroy_xattrs(struct ceph_inode_info *ci) +{ + struct rb_node *p, *tmp; + struct ceph_inode_xattr *xattr = NULL; + + p = rb_first(&ci->i_xattrs.index); + + dout("__ceph_destroy_xattrs p=%p\n", p); + + while (p) { + xattr = rb_entry(p, struct ceph_inode_xattr, node); + tmp = p; + p = rb_next(tmp); + dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p, + xattr->name_len, xattr->name); + rb_erase(tmp, &ci->i_xattrs.index); + + __free_xattr(xattr); + } + + ci->i_xattrs.names_size = 0; + ci->i_xattrs.vals_size = 0; + ci->i_xattrs.index_version = 0; + ci->i_xattrs.count = 0; + ci->i_xattrs.index = RB_ROOT; +} + +static int __build_xattrs(struct inode *inode) + __releases(ci->i_ceph_lock) + __acquires(ci->i_ceph_lock) +{ + u32 namelen; + u32 numattr = 0; + void *p, *end; + u32 len; + const char *name, *val; + struct ceph_inode_info *ci = ceph_inode(inode); + u64 xattr_version; + struct ceph_inode_xattr **xattrs = NULL; + int err = 0; + int i; + + dout("__build_xattrs() len=%d\n", + ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0); + + if (ci->i_xattrs.index_version >= ci->i_xattrs.version) + return 0; /* already built */ + + __ceph_destroy_xattrs(ci); + +start: + /* updated internal xattr rb tree */ + if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) { + p = ci->i_xattrs.blob->vec.iov_base; + end = p + ci->i_xattrs.blob->vec.iov_len; + ceph_decode_32_safe(&p, end, numattr, bad); + xattr_version = ci->i_xattrs.version; + spin_unlock(&ci->i_ceph_lock); + + xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *), + GFP_NOFS); + err = -ENOMEM; + if (!xattrs) + goto bad_lock; + + for (i = 0; i < numattr; i++) { + xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr), + GFP_NOFS); + if (!xattrs[i]) + goto bad_lock; + } + + spin_lock(&ci->i_ceph_lock); + if (ci->i_xattrs.version != xattr_version) { + /* lost a race, retry */ + for (i = 0; i < numattr; i++) + kfree(xattrs[i]); + kfree(xattrs); + xattrs = NULL; + goto start; + } + err = -EIO; + while (numattr--) { + ceph_decode_32_safe(&p, end, len, bad); + namelen = len; + name = p; + p += len; + ceph_decode_32_safe(&p, end, len, bad); + val = p; + p += len; + + err = __set_xattr(ci, name, namelen, val, len, + 0, 0, &xattrs[numattr]); + + if (err < 0) + goto bad; + } + kfree(xattrs); + } + ci->i_xattrs.index_version = ci->i_xattrs.version; + ci->i_xattrs.dirty = false; + + return err; +bad_lock: + spin_lock(&ci->i_ceph_lock); +bad: + if (xattrs) { + for (i = 0; i < numattr; i++) + kfree(xattrs[i]); + kfree(xattrs); + } + ci->i_xattrs.names_size = 0; + return err; +} + +static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size, + int val_size) +{ + /* + * 4 bytes for the length, and additional 4 bytes per each xattr name, + * 4 bytes per each value + */ + int size = 4 + ci->i_xattrs.count*(4 + 4) + + ci->i_xattrs.names_size + + ci->i_xattrs.vals_size; + dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n", + ci->i_xattrs.count, ci->i_xattrs.names_size, + ci->i_xattrs.vals_size); + + if (name_size) + size += 4 + 4 + name_size + val_size; + + return size; +} + +/* + * If there are dirty xattrs, reencode xattrs into the prealloc_blob + * and swap into place. It returns the old i_xattrs.blob (or NULL) so + * that it can be freed by the caller as the i_ceph_lock is likely to be + * held. + */ +struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci) +{ + struct rb_node *p; + struct ceph_inode_xattr *xattr = NULL; + struct ceph_buffer *old_blob = NULL; + void *dest; + + dout("__build_xattrs_blob %p\n", &ci->vfs_inode); + if (ci->i_xattrs.dirty) { + int need = __get_required_blob_size(ci, 0, 0); + + BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len); + + p = rb_first(&ci->i_xattrs.index); + dest = ci->i_xattrs.prealloc_blob->vec.iov_base; + + ceph_encode_32(&dest, ci->i_xattrs.count); + while (p) { + xattr = rb_entry(p, struct ceph_inode_xattr, node); + + ceph_encode_32(&dest, xattr->name_len); + memcpy(dest, xattr->name, xattr->name_len); + dest += xattr->name_len; + ceph_encode_32(&dest, xattr->val_len); + memcpy(dest, xattr->val, xattr->val_len); + dest += xattr->val_len; + + p = rb_next(p); + } + + /* adjust buffer len; it may be larger than we need */ + ci->i_xattrs.prealloc_blob->vec.iov_len = + dest - ci->i_xattrs.prealloc_blob->vec.iov_base; + + if (ci->i_xattrs.blob) + old_blob = ci->i_xattrs.blob; + ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob; + ci->i_xattrs.prealloc_blob = NULL; + ci->i_xattrs.dirty = false; + ci->i_xattrs.version++; + } + + return old_blob; +} + +static inline int __get_request_mask(struct inode *in) { + struct ceph_mds_request *req = current->journal_info; + int mask = 0; + if (req && req->r_target_inode == in) { + if (req->r_op == CEPH_MDS_OP_LOOKUP || + req->r_op == CEPH_MDS_OP_LOOKUPINO || + req->r_op == CEPH_MDS_OP_LOOKUPPARENT || + req->r_op == CEPH_MDS_OP_GETATTR) { + mask = le32_to_cpu(req->r_args.getattr.mask); + } else if (req->r_op == CEPH_MDS_OP_OPEN || + req->r_op == CEPH_MDS_OP_CREATE) { + mask = le32_to_cpu(req->r_args.open.mask); + } + } + return mask; +} + +ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, + size_t size) +{ + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_inode_xattr *xattr; + struct ceph_vxattr *vxattr = NULL; + int req_mask; + ssize_t err; + + /* let's see if a virtual xattr was requested */ + vxattr = ceph_match_vxattr(inode, name); + if (vxattr) { + int mask = 0; + if (vxattr->flags & VXATTR_FLAG_RSTAT) + mask |= CEPH_STAT_RSTAT; + err = ceph_do_getattr(inode, mask, true); + if (err) + return err; + err = -ENODATA; + if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) { + err = vxattr->getxattr_cb(ci, value, size); + if (size && size < err) + err = -ERANGE; + } + return err; + } + + req_mask = __get_request_mask(inode); + + spin_lock(&ci->i_ceph_lock); + dout("getxattr %p name '%s' ver=%lld index_ver=%lld\n", inode, name, + ci->i_xattrs.version, ci->i_xattrs.index_version); + + if (ci->i_xattrs.version == 0 || + !((req_mask & CEPH_CAP_XATTR_SHARED) || + __ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1))) { + spin_unlock(&ci->i_ceph_lock); + + /* security module gets xattr while filling trace */ + if (current->journal_info) { + pr_warn_ratelimited("sync getxattr %p " + "during filling trace\n", inode); + return -EBUSY; + } + + /* get xattrs from mds (if we don't already have them) */ + err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); + if (err) + return err; + spin_lock(&ci->i_ceph_lock); + } + + err = __build_xattrs(inode); + if (err < 0) + goto out; + + err = -ENODATA; /* == ENOATTR */ + xattr = __get_xattr(ci, name); + if (!xattr) + goto out; + + err = -ERANGE; + if (size && size < xattr->val_len) + goto out; + + err = xattr->val_len; + if (size == 0) + goto out; + + memcpy(value, xattr->val, xattr->val_len); + + if (current->journal_info && + !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) && + security_ismaclabel(name + XATTR_SECURITY_PREFIX_LEN)) + ci->i_ceph_flags |= CEPH_I_SEC_INITED; +out: + spin_unlock(&ci->i_ceph_lock); + return err; +} + +ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) +{ + struct inode *inode = d_inode(dentry); + struct ceph_inode_info *ci = ceph_inode(inode); + bool len_only = (size == 0); + u32 namelen; + int err; + + spin_lock(&ci->i_ceph_lock); + dout("listxattr %p ver=%lld index_ver=%lld\n", inode, + ci->i_xattrs.version, ci->i_xattrs.index_version); + + if (ci->i_xattrs.version == 0 || + !__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1)) { + spin_unlock(&ci->i_ceph_lock); + err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true); + if (err) + return err; + spin_lock(&ci->i_ceph_lock); + } + + err = __build_xattrs(inode); + if (err < 0) + goto out; + + /* add 1 byte for each xattr due to the null termination */ + namelen = ci->i_xattrs.names_size + ci->i_xattrs.count; + if (!len_only) { + if (namelen > size) { + err = -ERANGE; + goto out; + } + names = __copy_xattr_names(ci, names); + size -= namelen; + } + err = namelen; +out: + spin_unlock(&ci->i_ceph_lock); + return err; +} + +static int ceph_sync_setxattr(struct inode *inode, const char *name, + const char *value, size_t size, int flags) +{ + struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_mds_request *req; + struct ceph_mds_client *mdsc = fsc->mdsc; + struct ceph_pagelist *pagelist = NULL; + int op = CEPH_MDS_OP_SETXATTR; + int err; + + if (size > 0) { + /* copy value into pagelist */ + pagelist = ceph_pagelist_alloc(GFP_NOFS); + if (!pagelist) + return -ENOMEM; + + err = ceph_pagelist_append(pagelist, value, size); + if (err) + goto out; + } else if (!value) { + if (flags & CEPH_XATTR_REPLACE) + op = CEPH_MDS_OP_RMXATTR; + else + flags |= CEPH_XATTR_REMOVE; + } + + dout("setxattr value=%.*s\n", (int)size, value); + + /* do request */ + req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); + if (IS_ERR(req)) { + err = PTR_ERR(req); + goto out; + } + + req->r_path2 = kstrdup(name, GFP_NOFS); + if (!req->r_path2) { + ceph_mdsc_put_request(req); + err = -ENOMEM; + goto out; + } + + if (op == CEPH_MDS_OP_SETXATTR) { + req->r_args.setxattr.flags = cpu_to_le32(flags); + req->r_pagelist = pagelist; + pagelist = NULL; + } + + req->r_inode = inode; + ihold(inode); + req->r_num_caps = 1; + req->r_inode_drop = CEPH_CAP_XATTR_SHARED; + + dout("xattr.ver (before): %lld\n", ci->i_xattrs.version); + err = ceph_mdsc_do_request(mdsc, NULL, req); + ceph_mdsc_put_request(req); + dout("xattr.ver (after): %lld\n", ci->i_xattrs.version); + +out: + if (pagelist) + ceph_pagelist_release(pagelist); + return err; +} + +int __ceph_setxattr(struct inode *inode, const char *name, + const void *value, size_t size, int flags) +{ + struct ceph_vxattr *vxattr; + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; + struct ceph_cap_flush *prealloc_cf = NULL; + struct ceph_buffer *old_blob = NULL; + int issued; + int err; + int dirty = 0; + int name_len = strlen(name); + int val_len = size; + char *newname = NULL; + char *newval = NULL; + struct ceph_inode_xattr *xattr = NULL; + int required_blob_size; + bool check_realm = false; + bool lock_snap_rwsem = false; + + if (ceph_snap(inode) != CEPH_NOSNAP) + return -EROFS; + + vxattr = ceph_match_vxattr(inode, name); + if (vxattr) { + if (vxattr->flags & VXATTR_FLAG_READONLY) + return -EOPNOTSUPP; + if (value && !strncmp(vxattr->name, "ceph.quota", 10)) + check_realm = true; + } + + /* pass any unhandled ceph.* xattrs through to the MDS */ + if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) + goto do_sync_unlocked; + + /* preallocate memory for xattr name, value, index node */ + err = -ENOMEM; + newname = kmemdup(name, name_len + 1, GFP_NOFS); + if (!newname) + goto out; + + if (val_len) { + newval = kmemdup(value, val_len, GFP_NOFS); + if (!newval) + goto out; + } + + xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS); + if (!xattr) + goto out; + + prealloc_cf = ceph_alloc_cap_flush(); + if (!prealloc_cf) + goto out; + + spin_lock(&ci->i_ceph_lock); +retry: + issued = __ceph_caps_issued(ci, NULL); + if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) + goto do_sync; + + if (!lock_snap_rwsem && !ci->i_head_snapc) { + 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); + goto retry; + } + } + + dout("setxattr %p name '%s' issued %s\n", inode, name, + ceph_cap_string(issued)); + __build_xattrs(inode); + + required_blob_size = __get_required_blob_size(ci, name_len, val_len); + + if (!ci->i_xattrs.prealloc_blob || + required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { + struct ceph_buffer *blob; + + spin_unlock(&ci->i_ceph_lock); + ceph_buffer_put(old_blob); /* Shouldn't be required */ + dout(" pre-allocating new blob size=%d\n", required_blob_size); + blob = ceph_buffer_new(required_blob_size, GFP_NOFS); + if (!blob) + goto do_sync_unlocked; + spin_lock(&ci->i_ceph_lock); + /* prealloc_blob can't be released while holding i_ceph_lock */ + if (ci->i_xattrs.prealloc_blob) + old_blob = ci->i_xattrs.prealloc_blob; + ci->i_xattrs.prealloc_blob = blob; + goto retry; + } + + err = __set_xattr(ci, newname, name_len, newval, val_len, + flags, value ? 1 : -1, &xattr); + + if (!err) { + dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL, + &prealloc_cf); + ci->i_xattrs.dirty = true; + inode->i_ctime = current_time(inode); + } + + spin_unlock(&ci->i_ceph_lock); + ceph_buffer_put(old_blob); + if (lock_snap_rwsem) + up_read(&mdsc->snap_rwsem); + if (dirty) + __mark_inode_dirty(inode, dirty); + ceph_free_cap_flush(prealloc_cf); + return err; + +do_sync: + spin_unlock(&ci->i_ceph_lock); +do_sync_unlocked: + if (lock_snap_rwsem) + up_read(&mdsc->snap_rwsem); + + /* security module set xattr while filling trace */ + if (current->journal_info) { + pr_warn_ratelimited("sync setxattr %p " + "during filling trace\n", inode); + err = -EBUSY; + } else { + err = ceph_sync_setxattr(inode, name, value, size, flags); + if (err >= 0 && check_realm) { + /* check if snaprealm was created for quota inode */ + spin_lock(&ci->i_ceph_lock); + if ((ci->i_max_files || ci->i_max_bytes) && + !(ci->i_snap_realm && + ci->i_snap_realm->ino == ci->i_vino.ino)) + err = -EOPNOTSUPP; + spin_unlock(&ci->i_ceph_lock); + } + } +out: + ceph_free_cap_flush(prealloc_cf); + kfree(newname); + kfree(newval); + kfree(xattr); + return err; +} + +static int ceph_get_xattr_handler(const struct xattr_handler *handler, + struct dentry *dentry, struct inode *inode, + const char *name, void *value, size_t size) +{ + if (!ceph_is_valid_xattr(name)) + return -EOPNOTSUPP; + return __ceph_getxattr(inode, name, value, size); +} + +static int ceph_set_xattr_handler(const struct xattr_handler *handler, + struct dentry *unused, struct inode *inode, + const char *name, const void *value, + size_t size, int flags) +{ + if (!ceph_is_valid_xattr(name)) + return -EOPNOTSUPP; + return __ceph_setxattr(inode, name, value, size, flags); +} + +static const struct xattr_handler ceph_other_xattr_handler = { + .prefix = "", /* match any name => handlers called with full name */ + .get = ceph_get_xattr_handler, + .set = ceph_set_xattr_handler, +}; + +#ifdef CONFIG_SECURITY +bool ceph_security_xattr_wanted(struct inode *in) +{ + return in->i_security != NULL; +} + +bool ceph_security_xattr_deadlock(struct inode *in) +{ + struct ceph_inode_info *ci; + bool ret; + if (!in->i_security) + return false; + ci = ceph_inode(in); + spin_lock(&ci->i_ceph_lock); + ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) && + !(ci->i_xattrs.version > 0 && + __ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0)); + spin_unlock(&ci->i_ceph_lock); + return ret; +} + +#ifdef CONFIG_CEPH_FS_SECURITY_LABEL +int ceph_security_init_secctx(struct dentry *dentry, umode_t mode, + struct ceph_acl_sec_ctx *as_ctx) +{ + struct ceph_pagelist *pagelist = as_ctx->pagelist; + const char *name; + size_t name_len; + int err; + + err = security_dentry_init_security(dentry, mode, &dentry->d_name, + &as_ctx->sec_ctx, + &as_ctx->sec_ctxlen); + if (err < 0) { + WARN_ON_ONCE(err != -EOPNOTSUPP); + err = 0; /* do nothing */ + goto out; + } + + err = -ENOMEM; + if (!pagelist) { + pagelist = ceph_pagelist_alloc(GFP_KERNEL); + if (!pagelist) + goto out; + err = ceph_pagelist_reserve(pagelist, PAGE_SIZE); + if (err) + goto out; + ceph_pagelist_encode_32(pagelist, 1); + } + + /* + * FIXME: Make security_dentry_init_security() generic. Currently + * It only supports single security module and only selinux has + * dentry_init_security hook. + */ + name = XATTR_NAME_SELINUX; + name_len = strlen(name); + err = ceph_pagelist_reserve(pagelist, + 4 * 2 + name_len + as_ctx->sec_ctxlen); + if (err) + goto out; + + if (as_ctx->pagelist) { + /* update count of KV pairs */ + BUG_ON(pagelist->length <= sizeof(__le32)); + if (list_is_singular(&pagelist->head)) { + le32_add_cpu((__le32*)pagelist->mapped_tail, 1); + } else { + struct page *page = list_first_entry(&pagelist->head, + struct page, lru); + void *addr = kmap_atomic(page); + le32_add_cpu((__le32*)addr, 1); + kunmap_atomic(addr); + } + } else { + as_ctx->pagelist = pagelist; + } + + ceph_pagelist_encode_32(pagelist, name_len); + ceph_pagelist_append(pagelist, name, name_len); + + ceph_pagelist_encode_32(pagelist, as_ctx->sec_ctxlen); + ceph_pagelist_append(pagelist, as_ctx->sec_ctx, as_ctx->sec_ctxlen); + + err = 0; +out: + if (pagelist && !as_ctx->pagelist) + ceph_pagelist_release(pagelist); + return err; +} +#endif /* CONFIG_CEPH_FS_SECURITY_LABEL */ +#endif /* CONFIG_SECURITY */ + +void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx) +{ +#ifdef CONFIG_CEPH_FS_POSIX_ACL + posix_acl_release(as_ctx->acl); + posix_acl_release(as_ctx->default_acl); +#endif +#ifdef CONFIG_CEPH_FS_SECURITY_LABEL + security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen); +#endif + if (as_ctx->pagelist) + ceph_pagelist_release(as_ctx->pagelist); +} + +/* + * List of handlers for synthetic system.* attributes. Other + * attributes are handled directly. + */ +const struct xattr_handler *ceph_xattr_handlers[] = { +#ifdef CONFIG_CEPH_FS_POSIX_ACL + &posix_acl_access_xattr_handler, + &posix_acl_default_xattr_handler, +#endif + &ceph_other_xattr_handler, + NULL, +}; |