#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/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); /* * 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 NULL, }; static bool ceph_is_valid_xattr(const char *name) { return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) || !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) || !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_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') */ size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val, size_t size); bool readonly, hidden; bool (*exists_cb)(struct ceph_inode_info *ci); }; /* layouts */ static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci) { size_t s; char *p = (char *)&ci->i_layout; for (s = 0; s < sizeof(ci->i_layout); s++, p++) if (*p) return true; return false; } static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, size_t size) { int 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 = ceph_file_layout_pg_pool(ci->i_layout); const char *pool_name; char buf[128]; dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode); down_read(&osdc->map_sem); pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); if (pool_name) { size_t len = strlen(pool_name); ret = snprintf(buf, sizeof(buf), "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=", (unsigned long long)ceph_file_layout_su(ci->i_layout), (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout), (unsigned long long)ceph_file_layout_object_size(ci->i_layout)); if (!size) { ret += len; } else if (ret + len > size) { ret = -ERANGE; } else { memcpy(val, buf, ret); memcpy(val + ret, pool_name, len); ret += len; } } else { ret = snprintf(buf, sizeof(buf), "stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld", (unsigned long long)ceph_file_layout_su(ci->i_layout), (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout), (unsigned long long)ceph_file_layout_object_size(ci->i_layout), (unsigned long long)pool); if (size) { if (ret <= size) memcpy(val, buf, ret); else ret = -ERANGE; } } up_read(&osdc->map_sem); return ret; } static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", (unsigned long long)ceph_file_layout_su(ci->i_layout)); } static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout)); } static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", (unsigned long long)ceph_file_layout_object_size(ci->i_layout)); } static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci, char *val, size_t size) { int 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 = ceph_file_layout_pg_pool(ci->i_layout); const char *pool_name; down_read(&osdc->map_sem); pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); if (pool_name) ret = snprintf(val, size, "%s", pool_name); else ret = snprintf(val, size, "%lld", (unsigned long long)pool); up_read(&osdc->map_sem); return ret; } /* directories */ static size_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs); } static size_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", ci->i_files); } static size_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", ci->i_subdirs); } static size_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs); } static size_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", ci->i_rfiles); } static size_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", ci->i_rsubdirs); } static size_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%lld", ci->i_rbytes); } static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val, size_t size) { return snprintf(val, size, "%ld.09%ld", (long)ci->i_rctime.tv_sec, (long)ci->i_rctime.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) \ { \ .name = CEPH_XATTR_NAME(_type, _name), \ .name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \ .getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \ .readonly = true, \ .hidden = false, \ .exists_cb = NULL, \ } #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, \ .readonly = false, \ .hidden = true, \ .exists_cb = ceph_vxattrcb_layout_exists, \ } static struct ceph_vxattr ceph_dir_vxattrs[] = { { .name = "ceph.dir.layout", .name_size = sizeof("ceph.dir.layout"), .getxattr_cb = ceph_vxattrcb_layout, .readonly = false, .hidden = true, .exists_cb = ceph_vxattrcb_layout_exists, }, 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_NAME_CEPH(dir, entries), XATTR_NAME_CEPH(dir, files), XATTR_NAME_CEPH(dir, subdirs), XATTR_NAME_CEPH(dir, rentries), XATTR_NAME_CEPH(dir, rfiles), XATTR_NAME_CEPH(dir, rsubdirs), XATTR_NAME_CEPH(dir, rbytes), XATTR_NAME_CEPH(dir, rctime), { .name = NULL, 0 } /* Required table terminator */ }; static size_t ceph_dir_vxattrs_name_size; /* total size of all names */ /* files */ static struct ceph_vxattr ceph_file_vxattrs[] = { { .name = "ceph.file.layout", .name_size = sizeof("ceph.file.layout"), .getxattr_cb = ceph_vxattrcb_layout, .readonly = false, .hidden = true, .exists_cb = ceph_vxattrcb_layout_exists, }, 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), { .name = NULL, 0 } /* Required table terminator */ }; static size_t ceph_file_vxattrs_name_size; /* total size of all names */ 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 size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs) { if (vxattrs == ceph_dir_vxattrs) return ceph_dir_vxattrs_name_size; if (vxattrs == ceph_file_vxattrs) return ceph_file_vxattrs_name_size; BUG_ON(vxattrs); return 0; } /* * Compute the aggregate size (including terminating '\0') of all * virtual extended attribute names in the given vxattr table. */ static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs) { struct ceph_vxattr *vxattr; size_t size = 0; for (vxattr = vxattrs; vxattr->name; vxattr++) if (!vxattr->hidden) size += vxattr->name_size; return size; } /* Routines called at initialization and exit time */ void __init ceph_xattr_init(void) { ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs); ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs); } void ceph_xattr_exit(void) { ceph_dir_vxattrs_name_size = 0; ceph_file_vxattrs_name_size = 0; } 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); return err; } if (update_xattr < 0) { if (xattr) __remove_xattr(ci, xattr); kfree(name); 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((void *)xattr->val); if (update_xattr) { kfree((void *)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, 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((void *)xattr->name); if (xattr->should_free_val) kfree((void *)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((void *)xattr->name); if (xattr->should_free_val) kfree((void *)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 int __remove_xattr_by_name(struct ceph_inode_info *ci, const char *name) { struct rb_node **p; struct ceph_inode_xattr *xattr; int err; p = &ci->i_xattrs.index.rb_node; xattr = __get_xattr(ci, name); err = __remove_xattr(ci, xattr); return err; } 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); int 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. */ void __ceph_build_xattrs_blob(struct ceph_inode_info *ci) { struct rb_node *p; struct ceph_inode_xattr *xattr = 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) ceph_buffer_put(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++; } } ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, size_t size) { struct ceph_inode_info *ci = ceph_inode(inode); int err; struct ceph_inode_xattr *xattr; struct ceph_vxattr *vxattr = NULL; if (!ceph_is_valid_xattr(name)) return -ENODATA; /* let's see if a virtual xattr was requested */ vxattr = ceph_match_vxattr(inode, name); if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) { err = vxattr->getxattr_cb(ci, value, size); return err; } spin_lock(&ci->i_ceph_lock); dout("getxattr %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(ci, CEPH_CAP_XATTR_SHARED, 1)) { spin_unlock(&ci->i_ceph_lock); /* 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); out: spin_unlock(&ci->i_ceph_lock); return err; } ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value, size_t size) { if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return generic_getxattr(dentry, name, value, size); return __ceph_getxattr(d_inode(dentry), name, value, size); } 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); struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode); u32 vir_namelen = 0; u32 namelen; int err; u32 len; int i; 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(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; /* * Start with virtual dir xattr names (if any) (including * terminating '\0' characters for each). */ vir_namelen = ceph_vxattrs_name_size(vxattrs); /* adding 1 byte per each variable due to the null termination */ namelen = ci->i_xattrs.names_size + ci->i_xattrs.count; err = -ERANGE; if (size && vir_namelen + namelen > size) goto out; err = namelen + vir_namelen; if (size == 0) goto out; names = __copy_xattr_names(ci, names); /* virtual xattr names, too */ err = namelen; if (vxattrs) { for (i = 0; vxattrs[i].name; i++) { if (!vxattrs[i].hidden && !(vxattrs[i].exists_cb && !vxattrs[i].exists_cb(ci))) { len = sprintf(names, "%s", vxattrs[i].name); names += len + 1; err += len + 1; } } } out: spin_unlock(&ci->i_ceph_lock); return err; } static int ceph_sync_setxattr(struct dentry *dentry, const char *name, const char *value, size_t size, int flags) { struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); struct inode *inode = d_inode(dentry); 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 err; if (size > 0) { /* copy value into pagelist */ pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); if (!pagelist) return -ENOMEM; ceph_pagelist_init(pagelist); err = ceph_pagelist_append(pagelist, value, size); if (err) goto out; } else if (!value) { flags |= CEPH_XATTR_REMOVE; } dout("setxattr value=%.*s\n", (int)size, value); /* do request */ req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR, USE_AUTH_MDS); if (IS_ERR(req)) { err = PTR_ERR(req); goto out; } req->r_args.setxattr.flags = cpu_to_le32(flags); req->r_path2 = kstrdup(name, GFP_NOFS); if (!req->r_path2) { ceph_mdsc_put_request(req); err = -ENOMEM; goto out; } 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 dentry *dentry, const char *name, const void *value, size_t size, int flags) { struct inode *inode = d_inode(dentry); struct ceph_vxattr *vxattr; struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc; struct ceph_cap_flush *prealloc_cf = 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 lock_snap_rwsem = false; if (!ceph_is_valid_xattr(name)) return -EOPNOTSUPP; vxattr = ceph_match_vxattr(inode, name); if (vxattr && vxattr->readonly) return -EOPNOTSUPP; /* 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 issued %s\n", inode, 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); dout(" preaallocating 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); if (ci->i_xattrs.prealloc_blob) ceph_buffer_put(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; } spin_unlock(&ci->i_ceph_lock); 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); err = ceph_sync_setxattr(dentry, name, value, size, flags); out: ceph_free_cap_flush(prealloc_cf); kfree(newname); kfree(newval); kfree(xattr); return err; } int ceph_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) return -EROFS; if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return generic_setxattr(dentry, name, value, size, flags); if (size == 0) value = ""; /* empty EA, do not remove */ return __ceph_setxattr(dentry, name, value, size, flags); } static int ceph_send_removexattr(struct dentry *dentry, const char *name) { struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); struct ceph_mds_client *mdsc = fsc->mdsc; struct inode *inode = d_inode(dentry); struct ceph_mds_request *req; int err; req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR, USE_AUTH_MDS); if (IS_ERR(req)) return PTR_ERR(req); req->r_path2 = kstrdup(name, GFP_NOFS); if (!req->r_path2) return -ENOMEM; req->r_inode = inode; ihold(inode); req->r_num_caps = 1; req->r_inode_drop = CEPH_CAP_XATTR_SHARED; err = ceph_mdsc_do_request(mdsc, NULL, req); ceph_mdsc_put_request(req); return err; } int __ceph_removexattr(struct dentry *dentry, const char *name) { struct inode *inode = d_inode(dentry); struct ceph_vxattr *vxattr; struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc; struct ceph_cap_flush *prealloc_cf = NULL; int issued; int err; int required_blob_size; int dirty; bool lock_snap_rwsem = false; if (!ceph_is_valid_xattr(name)) return -EOPNOTSUPP; vxattr = ceph_match_vxattr(inode, name); if (vxattr && vxattr->readonly) return -EOPNOTSUPP; /* pass any unhandled ceph.* xattrs through to the MDS */ if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN)) goto do_sync_unlocked; prealloc_cf = ceph_alloc_cap_flush(); if (!prealloc_cf) return -ENOMEM; err = -ENOMEM; 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("removexattr %p issued %s\n", inode, ceph_cap_string(issued)); __build_xattrs(inode); required_blob_size = __get_required_blob_size(ci, 0, 0); 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); dout(" preaallocating 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); if (ci->i_xattrs.prealloc_blob) ceph_buffer_put(ci->i_xattrs.prealloc_blob); ci->i_xattrs.prealloc_blob = blob; goto retry; } err = __remove_xattr_by_name(ceph_inode(inode), name); dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL, &prealloc_cf); ci->i_xattrs.dirty = true; inode->i_ctime = CURRENT_TIME; spin_unlock(&ci->i_ceph_lock); 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); ceph_free_cap_flush(prealloc_cf); err = ceph_send_removexattr(dentry, name); return err; } int ceph_removexattr(struct dentry *dentry, const char *name) { if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) return -EROFS; if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return generic_removexattr(dentry, name); return __ceph_removexattr(dentry, name); }