| #include "ceph_debug.h" |
| #include "super.h" |
| #include "decode.h" |
| |
| #include <linux/xattr.h> |
| #include <linux/slab.h> |
| |
| static bool ceph_is_valid_xattr(const char *name) |
| { |
| return !strncmp(name, XATTR_SECURITY_PREFIX, |
| XATTR_SECURITY_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_cb { |
| bool readonly; |
| char *name; |
| size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val, |
| size_t size); |
| }; |
| |
| /* directories */ |
| |
| static size_t ceph_vxattrcb_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_files(struct ceph_inode_info *ci, char *val, |
| size_t size) |
| { |
| return snprintf(val, size, "%lld", ci->i_files); |
| } |
| |
| static size_t ceph_vxattrcb_subdirs(struct ceph_inode_info *ci, char *val, |
| size_t size) |
| { |
| return snprintf(val, size, "%lld", ci->i_subdirs); |
| } |
| |
| static size_t ceph_vxattrcb_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_rfiles(struct ceph_inode_info *ci, char *val, |
| size_t size) |
| { |
| return snprintf(val, size, "%lld", ci->i_rfiles); |
| } |
| |
| static size_t ceph_vxattrcb_rsubdirs(struct ceph_inode_info *ci, char *val, |
| size_t size) |
| { |
| return snprintf(val, size, "%lld", ci->i_rsubdirs); |
| } |
| |
| static size_t ceph_vxattrcb_rbytes(struct ceph_inode_info *ci, char *val, |
| size_t size) |
| { |
| return snprintf(val, size, "%lld", ci->i_rbytes); |
| } |
| |
| static size_t ceph_vxattrcb_rctime(struct ceph_inode_info *ci, char *val, |
| size_t size) |
| { |
| return snprintf(val, size, "%ld.%ld", (long)ci->i_rctime.tv_sec, |
| (long)ci->i_rctime.tv_nsec); |
| } |
| |
| static struct ceph_vxattr_cb ceph_dir_vxattrs[] = { |
| { true, "user.ceph.dir.entries", ceph_vxattrcb_entries}, |
| { true, "user.ceph.dir.files", ceph_vxattrcb_files}, |
| { true, "user.ceph.dir.subdirs", ceph_vxattrcb_subdirs}, |
| { true, "user.ceph.dir.rentries", ceph_vxattrcb_rentries}, |
| { true, "user.ceph.dir.rfiles", ceph_vxattrcb_rfiles}, |
| { true, "user.ceph.dir.rsubdirs", ceph_vxattrcb_rsubdirs}, |
| { true, "user.ceph.dir.rbytes", ceph_vxattrcb_rbytes}, |
| { true, "user.ceph.dir.rctime", ceph_vxattrcb_rctime}, |
| { true, NULL, NULL } |
| }; |
| |
| /* files */ |
| |
| static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, |
| size_t size) |
| { |
| int ret; |
| |
| ret = snprintf(val, size, |
| "chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n", |
| (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 (ceph_file_layout_pg_preferred(ci->i_layout)) |
| ret += snprintf(val + ret, size, "preferred_osd=%lld\n", |
| (unsigned long long)ceph_file_layout_pg_preferred( |
| ci->i_layout)); |
| return ret; |
| } |
| |
| static struct ceph_vxattr_cb ceph_file_vxattrs[] = { |
| { true, "user.ceph.layout", ceph_vxattrcb_layout}, |
| { NULL, NULL } |
| }; |
| |
| static struct ceph_vxattr_cb *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_cb *ceph_match_vxattr(struct ceph_vxattr_cb *vxattr, |
| const char *name) |
| { |
| do { |
| if (strcmp(vxattr->name, name) == 0) |
| return vxattr; |
| vxattr++; |
| } while (vxattr->name); |
| return NULL; |
| } |
| |
| static int __set_xattr(struct ceph_inode_info *ci, |
| const char *name, int name_len, |
| const char *val, int val_len, |
| int dirty, |
| int should_free_name, int should_free_val, |
| 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 (!xattr) { |
| new = 1; |
| xattr = *newxattr; |
| xattr->name = name; |
| xattr->name_len = name_len; |
| xattr->should_free_name = should_free_name; |
| |
| 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 (should_free_name) { |
| 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 = dirty; |
| xattr->should_free_val = (val && should_free_val); |
| |
| 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 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) |
| 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 -EOPNOTSUPP; |
| |
| 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) |
| { |
| 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(&inode->i_lock); |
| |
| xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *), |
| GFP_NOFS); |
| err = -ENOMEM; |
| if (!xattrs) |
| goto bad_lock; |
| memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *)); |
| for (i = 0; i < numattr; i++) { |
| xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr), |
| GFP_NOFS); |
| if (!xattrs[i]) |
| goto bad_lock; |
| } |
| |
| spin_lock(&inode->i_lock); |
| if (ci->i_xattrs.version != xattr_version) { |
| /* lost a race, retry */ |
| for (i = 0; i < numattr; i++) |
| kfree(xattrs[i]); |
| kfree(xattrs); |
| 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, 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(&inode->i_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; |
| } |
| } |
| |
| ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value, |
| size_t size) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode); |
| int err; |
| struct ceph_inode_xattr *xattr; |
| struct ceph_vxattr_cb *vxattr = NULL; |
| |
| if (!ceph_is_valid_xattr(name)) |
| return -ENODATA; |
| |
| /* let's see if a virtual xattr was requested */ |
| if (vxattrs) |
| vxattr = ceph_match_vxattr(vxattrs, name); |
| |
| spin_lock(&inode->i_lock); |
| dout("getxattr %p ver=%lld index_ver=%lld\n", inode, |
| ci->i_xattrs.version, ci->i_xattrs.index_version); |
| |
| if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) && |
| (ci->i_xattrs.index_version >= ci->i_xattrs.version)) { |
| goto get_xattr; |
| } else { |
| spin_unlock(&inode->i_lock); |
| /* get xattrs from mds (if we don't already have them) */ |
| err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR); |
| if (err) |
| return err; |
| } |
| |
| spin_lock(&inode->i_lock); |
| |
| if (vxattr && vxattr->readonly) { |
| err = vxattr->getxattr_cb(ci, value, size); |
| goto out; |
| } |
| |
| err = __build_xattrs(inode); |
| if (err < 0) |
| goto out; |
| |
| get_xattr: |
| err = -ENODATA; /* == ENOATTR */ |
| xattr = __get_xattr(ci, name); |
| if (!xattr) { |
| if (vxattr) |
| err = vxattr->getxattr_cb(ci, value, size); |
| 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(&inode->i_lock); |
| return err; |
| } |
| |
| ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode); |
| u32 vir_namelen = 0; |
| u32 namelen; |
| int err; |
| u32 len; |
| int i; |
| |
| spin_lock(&inode->i_lock); |
| dout("listxattr %p ver=%lld index_ver=%lld\n", inode, |
| ci->i_xattrs.version, ci->i_xattrs.index_version); |
| |
| if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) && |
| (ci->i_xattrs.index_version >= ci->i_xattrs.version)) { |
| goto list_xattr; |
| } else { |
| spin_unlock(&inode->i_lock); |
| err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR); |
| if (err) |
| return err; |
| } |
| |
| spin_lock(&inode->i_lock); |
| |
| err = __build_xattrs(inode); |
| if (err < 0) |
| goto out; |
| |
| list_xattr: |
| vir_namelen = 0; |
| /* include virtual dir xattrs */ |
| if (vxattrs) |
| for (i = 0; vxattrs[i].name; i++) |
| vir_namelen += strlen(vxattrs[i].name) + 1; |
| /* adding 1 byte per each variable due to the null termination */ |
| namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count; |
| err = -ERANGE; |
| if (size && namelen > size) |
| goto out; |
| |
| err = namelen; |
| if (size == 0) |
| goto out; |
| |
| names = __copy_xattr_names(ci, names); |
| |
| /* virtual xattr names, too */ |
| if (vxattrs) |
| for (i = 0; vxattrs[i].name; i++) { |
| len = sprintf(names, "%s", vxattrs[i].name); |
| names += len + 1; |
| } |
| |
| out: |
| spin_unlock(&inode->i_lock); |
| return err; |
| } |
| |
| static int ceph_sync_setxattr(struct dentry *dentry, const char *name, |
| const char *value, size_t size, int flags) |
| { |
| struct ceph_client *client = ceph_sb_to_client(dentry->d_sb); |
| struct inode *inode = dentry->d_inode; |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| struct inode *parent_inode = dentry->d_parent->d_inode; |
| struct ceph_mds_request *req; |
| struct ceph_mds_client *mdsc = &client->mdsc; |
| int err; |
| int i, nr_pages; |
| struct page **pages = NULL; |
| void *kaddr; |
| |
| /* copy value into some pages */ |
| nr_pages = calc_pages_for(0, size); |
| if (nr_pages) { |
| pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS); |
| if (!pages) |
| return -ENOMEM; |
| err = -ENOMEM; |
| for (i = 0; i < nr_pages; i++) { |
| pages[i] = __page_cache_alloc(GFP_NOFS); |
| if (!pages[i]) { |
| nr_pages = i; |
| goto out; |
| } |
| kaddr = kmap(pages[i]); |
| memcpy(kaddr, value + i*PAGE_CACHE_SIZE, |
| min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE)); |
| } |
| } |
| |
| 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_inode = igrab(inode); |
| req->r_inode_drop = CEPH_CAP_XATTR_SHARED; |
| req->r_num_caps = 1; |
| req->r_args.setxattr.flags = cpu_to_le32(flags); |
| req->r_path2 = kstrdup(name, GFP_NOFS); |
| |
| req->r_pages = pages; |
| req->r_num_pages = nr_pages; |
| req->r_data_len = size; |
| |
| dout("xattr.ver (before): %lld\n", ci->i_xattrs.version); |
| err = ceph_mdsc_do_request(mdsc, parent_inode, req); |
| ceph_mdsc_put_request(req); |
| dout("xattr.ver (after): %lld\n", ci->i_xattrs.version); |
| |
| out: |
| if (pages) { |
| for (i = 0; i < nr_pages; i++) |
| __free_page(pages[i]); |
| kfree(pages); |
| } |
| return err; |
| } |
| |
| int ceph_setxattr(struct dentry *dentry, const char *name, |
| const void *value, size_t size, int flags) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode); |
| int err; |
| int name_len = strlen(name); |
| int val_len = size; |
| char *newname = NULL; |
| char *newval = NULL; |
| struct ceph_inode_xattr *xattr = NULL; |
| int issued; |
| int required_blob_size; |
| |
| if (ceph_snap(inode) != CEPH_NOSNAP) |
| return -EROFS; |
| |
| if (!ceph_is_valid_xattr(name)) |
| return -EOPNOTSUPP; |
| |
| if (vxattrs) { |
| struct ceph_vxattr_cb *vxattr = |
| ceph_match_vxattr(vxattrs, name); |
| if (vxattr && vxattr->readonly) |
| return -EOPNOTSUPP; |
| } |
| |
| /* preallocate memory for xattr name, value, index node */ |
| err = -ENOMEM; |
| newname = kmalloc(name_len + 1, GFP_NOFS); |
| if (!newname) |
| goto out; |
| memcpy(newname, name, name_len + 1); |
| |
| if (val_len) { |
| newval = kmalloc(val_len + 1, GFP_NOFS); |
| if (!newval) |
| goto out; |
| memcpy(newval, value, val_len); |
| newval[val_len] = '\0'; |
| } |
| |
| xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS); |
| if (!xattr) |
| goto out; |
| |
| spin_lock(&inode->i_lock); |
| retry: |
| issued = __ceph_caps_issued(ci, NULL); |
| if (!(issued & CEPH_CAP_XATTR_EXCL)) |
| goto do_sync; |
| __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 = NULL; |
| |
| spin_unlock(&inode->i_lock); |
| dout(" preaallocating new blob size=%d\n", required_blob_size); |
| blob = ceph_buffer_new(required_blob_size, GFP_NOFS); |
| if (!blob) |
| goto out; |
| spin_lock(&inode->i_lock); |
| if (ci->i_xattrs.prealloc_blob) |
| ceph_buffer_put(ci->i_xattrs.prealloc_blob); |
| ci->i_xattrs.prealloc_blob = blob; |
| goto retry; |
| } |
| |
| dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued)); |
| err = __set_xattr(ci, newname, name_len, newval, |
| val_len, 1, 1, 1, &xattr); |
| __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); |
| ci->i_xattrs.dirty = true; |
| inode->i_ctime = CURRENT_TIME; |
| spin_unlock(&inode->i_lock); |
| |
| return err; |
| |
| do_sync: |
| spin_unlock(&inode->i_lock); |
| err = ceph_sync_setxattr(dentry, name, value, size, flags); |
| out: |
| kfree(newname); |
| kfree(newval); |
| kfree(xattr); |
| return err; |
| } |
| |
| static int ceph_send_removexattr(struct dentry *dentry, const char *name) |
| { |
| struct ceph_client *client = ceph_sb_to_client(dentry->d_sb); |
| struct ceph_mds_client *mdsc = &client->mdsc; |
| struct inode *inode = dentry->d_inode; |
| struct inode *parent_inode = dentry->d_parent->d_inode; |
| 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_inode = igrab(inode); |
| req->r_inode_drop = CEPH_CAP_XATTR_SHARED; |
| req->r_num_caps = 1; |
| req->r_path2 = kstrdup(name, GFP_NOFS); |
| |
| err = ceph_mdsc_do_request(mdsc, parent_inode, req); |
| ceph_mdsc_put_request(req); |
| return err; |
| } |
| |
| int ceph_removexattr(struct dentry *dentry, const char *name) |
| { |
| struct inode *inode = dentry->d_inode; |
| struct ceph_inode_info *ci = ceph_inode(inode); |
| struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode); |
| int issued; |
| int err; |
| |
| if (ceph_snap(inode) != CEPH_NOSNAP) |
| return -EROFS; |
| |
| if (!ceph_is_valid_xattr(name)) |
| return -EOPNOTSUPP; |
| |
| if (vxattrs) { |
| struct ceph_vxattr_cb *vxattr = |
| ceph_match_vxattr(vxattrs, name); |
| if (vxattr && vxattr->readonly) |
| return -EOPNOTSUPP; |
| } |
| |
| spin_lock(&inode->i_lock); |
| __build_xattrs(inode); |
| issued = __ceph_caps_issued(ci, NULL); |
| dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued)); |
| |
| if (!(issued & CEPH_CAP_XATTR_EXCL)) |
| goto do_sync; |
| |
| err = __remove_xattr_by_name(ceph_inode(inode), name); |
| __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL); |
| ci->i_xattrs.dirty = true; |
| inode->i_ctime = CURRENT_TIME; |
| |
| spin_unlock(&inode->i_lock); |
| |
| return err; |
| do_sync: |
| spin_unlock(&inode->i_lock); |
| err = ceph_send_removexattr(dentry, name); |
| return err; |
| } |
| |