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Message-id: <001401cda2f1$8f16b320$ad441960$%kim@samsung.com>
Date: Fri, 05 Oct 2012 21:04:23 +0900
From: 김재극 <jaegeuk.kim@...sung.com>
To: viro@...iv.linux.org.uk, 'Theodore Ts'o' <tytso@....edu>,
gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
chur.lee@...sung.com, cm224.lee@...sung.com,
jaegeuk.kim@...sung.com, jooyoung.hwang@...sung.com
Subject: [PATCH 13/16] f2fs: add xattr and acl functionalities
This implements xattr and acl functionalities.
- F2FS uses a node page to contain use extended attributes.
Signed-off-by: Changman Lee <cm224.lee@...sung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@...sung.com>
---
fs/f2fs/acl.c | 402 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/f2fs/acl.h | 57 ++++++++
fs/f2fs/xattr.c | 387 ++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/f2fs/xattr.h | 142 ++++++++++++++++++++
4 files changed, 988 insertions(+)
create mode 100644 fs/f2fs/acl.c
create mode 100644 fs/f2fs/acl.h
create mode 100644 fs/f2fs/xattr.c
create mode 100644 fs/f2fs/xattr.h
diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
new file mode 100644
index 0000000..f3682a5
--- /dev/null
+++ b/fs/f2fs/acl.c
@@ -0,0 +1,402 @@
+/**
+ * fs/f2fs/acl.c
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * Portions of this code from linux/fs/ext2/acl.c
+ *
+ * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@...e.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/f2fs_fs.h>
+#include "f2fs.h"
+#include "xattr.h"
+#include "acl.h"
+
+#define get_inode_mode(i) ((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \
+ (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))
+
+static inline size_t f2fs_acl_size(int count)
+{
+ if (count <= 4) {
+ return sizeof(struct f2fs_acl_header) +
+ count * sizeof(struct f2fs_acl_entry_short);
+ } else {
+ return sizeof(struct f2fs_acl_header) +
+ 4 * sizeof(struct f2fs_acl_entry_short) +
+ (count - 4) * sizeof(struct f2fs_acl_entry);
+ }
+}
+
+static inline int f2fs_acl_count(size_t size)
+{
+ ssize_t s;
+ size -= sizeof(struct f2fs_acl_header);
+ s = size - 4 * sizeof(struct f2fs_acl_entry_short);
+ if (s < 0) {
+ if (size % sizeof(struct f2fs_acl_entry_short))
+ return -1;
+ return size / sizeof(struct f2fs_acl_entry_short);
+ } else {
+ if (s % sizeof(struct f2fs_acl_entry))
+ return -1;
+ return s / sizeof(struct f2fs_acl_entry) + 4;
+ }
+}
+
+static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size)
+{
+ int i, count;
+ struct posix_acl *acl;
+ struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value;
+ struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1);
+ const char *end = value + size;
+
+ if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION))
+ return ERR_PTR(-EINVAL);
+
+ count = f2fs_acl_count(size);
+ if (count < 0)
+ return ERR_PTR(-EINVAL);
+ if (count == 0)
+ return NULL;
+
+ acl = posix_acl_alloc(count, GFP_KERNEL);
+ if (!acl)
+ return ERR_PTR(-ENOMEM);
+
+ for (i = 0; i < count; i++) {
+
+ if ((char *)entry > end)
+ goto fail;
+
+ acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag);
+ acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm);
+
+ switch (acl->a_entries[i].e_tag) {
+ case ACL_USER:
+ case ACL_GROUP:
+ acl->a_entries[i].e_id = le32_to_cpu(entry->e_id);
+ entry = (struct f2fs_acl_entry *)((char *)entry +
+ sizeof(struct f2fs_acl_entry));
+ break;
+ case ACL_USER_OBJ:
+ case ACL_GROUP_OBJ:
+ case ACL_MASK:
+ case ACL_OTHER:
+ acl->a_entries[i].e_id = ACL_UNDEFINED_ID;
+ entry = (struct f2fs_acl_entry *)((char *)entry +
+ sizeof(struct f2fs_acl_entry_short));
+ break;
+ default:
+ goto fail;
+ }
+ }
+ if ((char *)entry != end)
+ goto fail;
+ return acl;
+fail:
+ posix_acl_release(acl);
+ return ERR_PTR(-EINVAL);
+}
+
+static void *f2fs_acl_to_disk(const struct posix_acl *acl, size_t *size)
+{
+ struct f2fs_acl_header *f2fs_acl;
+ struct f2fs_acl_entry *entry;
+ int i;
+
+ f2fs_acl = kmalloc(sizeof(struct f2fs_acl_header) + acl->a_count *
+ sizeof(struct f2fs_acl_entry), GFP_KERNEL);
+ if (!f2fs_acl)
+ return ERR_PTR(-ENOMEM);
+
+ f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION);
+ entry = (struct f2fs_acl_entry *)(f2fs_acl + 1);
+
+ for (i = 0; i < acl->a_count; i++) {
+
+ entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag);
+ entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm);
+
+ switch (acl->a_entries[i].e_tag) {
+ case ACL_USER:
+ case ACL_GROUP:
+ entry->e_id = cpu_to_le32(acl->a_entries[i].e_id);
+ entry = (struct f2fs_acl_entry *)((char *)entry +
+ sizeof(struct f2fs_acl_entry));
+ break;
+ case ACL_USER_OBJ:
+ case ACL_GROUP_OBJ:
+ case ACL_MASK:
+ case ACL_OTHER:
+ entry = (struct f2fs_acl_entry *)((char *)entry +
+ sizeof(struct f2fs_acl_entry_short));
+ break;
+ default:
+ goto fail;
+ }
+ }
+ *size = f2fs_acl_size(acl->a_count);
+ return (void *)f2fs_acl;
+
+fail:
+ kfree(f2fs_acl);
+ return ERR_PTR(-EINVAL);
+}
+
+struct posix_acl *f2fs_get_acl(struct inode *inode, int type)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+ int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
+ void *value = NULL;
+ struct posix_acl *acl;
+ int retval;
+
+ if (!test_opt(sbi, POSIX_ACL))
+ return NULL;
+
+ acl = get_cached_acl(inode, type);
+ if (acl != ACL_NOT_CACHED)
+ return acl;
+
+ if (type == ACL_TYPE_ACCESS)
+ name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
+
+ retval = f2fs_getxattr(inode, name_index, "", NULL, 0);
+ if (retval > 0) {
+ value = kmalloc(retval, GFP_KERNEL);
+ if (!value)
+ return ERR_PTR(-ENOMEM);
+ retval = f2fs_getxattr(inode, name_index, "", value, retval);
+ }
+
+ if (retval < 0) {
+ if (retval == -ENODATA)
+ acl = NULL;
+ else
+ acl = ERR_PTR(retval);
+ } else {
+ acl = f2fs_acl_from_disk(value, retval);
+ }
+ kfree(value);
+ if (!IS_ERR(acl))
+ set_cached_acl(inode, type, acl);
+
+ return acl;
+}
+
+static int f2fs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+ struct f2fs_inode_info *fi = F2FS_I(inode);
+ int name_index;
+ void *value = NULL;
+ size_t size = 0;
+ int error;
+
+ if (!test_opt(sbi, POSIX_ACL))
+ return 0;
+ if (S_ISLNK(inode->i_mode))
+ return -EOPNOTSUPP;
+
+ switch (type) {
+ case ACL_TYPE_ACCESS:
+ name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
+ if (acl) {
+ error = posix_acl_equiv_mode(acl, &inode->i_mode);
+ if (error < 0)
+ return error;
+ set_acl_inode(fi, inode->i_mode);
+ if (error == 0)
+ acl = NULL;
+ }
+ break;
+
+ case ACL_TYPE_DEFAULT:
+ name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT;
+ if (!S_ISDIR(inode->i_mode))
+ return acl ? -EACCES : 0;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (acl) {
+ value = f2fs_acl_to_disk(acl, &size);
+ if (IS_ERR(value)) {
+ cond_clear_inode_flag(fi, FI_ACL_MODE);
+ return (int)PTR_ERR(value);
+ }
+ }
+
+ error = f2fs_setxattr(inode, name_index, "", value, size);
+
+ kfree(value);
+ if (!error)
+ set_cached_acl(inode, type, acl);
+
+ cond_clear_inode_flag(fi, FI_ACL_MODE);
+ return error;
+}
+
+int f2fs_init_acl(struct inode *inode, struct inode *dir)
+{
+ struct posix_acl *acl = NULL;
+ struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
+ int error = 0;
+
+ if (!S_ISLNK(inode->i_mode)) {
+ if (test_opt(sbi, POSIX_ACL)) {
+ acl = f2fs_get_acl(dir, ACL_TYPE_DEFAULT);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ }
+ if (!acl)
+ inode->i_mode &= ~current_umask();
+ }
+
+ if (test_opt(sbi, POSIX_ACL) && acl) {
+
+ if (S_ISDIR(inode->i_mode)) {
+ error = f2fs_set_acl(inode, ACL_TYPE_DEFAULT, acl);
+ if (error)
+ goto cleanup;
+ }
+ error = posix_acl_create(&acl, GFP_KERNEL, &inode->i_mode);
+ if (error < 0)
+ return error;
+ if (error > 0)
+ error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
+ }
+cleanup:
+ posix_acl_release(acl);
+ return error;
+}
+
+int f2fs_acl_chmod(struct inode *inode)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+ struct posix_acl *acl;
+ int error;
+ mode_t mode = get_inode_mode(inode);
+
+ if (!test_opt(sbi, POSIX_ACL))
+ return 0;
+ if (S_ISLNK(mode))
+ return -EOPNOTSUPP;
+
+ acl = f2fs_get_acl(inode, ACL_TYPE_ACCESS);
+ if (IS_ERR(acl) || !acl)
+ return PTR_ERR(acl);
+
+ error = posix_acl_chmod(&acl, GFP_KERNEL, mode);
+ if (error)
+ return error;
+ error = f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl);
+ posix_acl_release(acl);
+ return error;
+}
+
+static size_t f2fs_xattr_list_acl(struct dentry *dentry, char *list,
+ size_t list_size, const char *name, size_t name_len, int type)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
+ const char *xname = POSIX_ACL_XATTR_DEFAULT;
+ size_t size;
+
+ if (!test_opt(sbi, POSIX_ACL))
+ return 0;
+
+ if (type == ACL_TYPE_ACCESS)
+ xname = POSIX_ACL_XATTR_ACCESS;
+
+ size = strlen(xname) + 1;
+ if (list && size <= list_size)
+ memcpy(list, xname, size);
+ return size;
+}
+
+static int f2fs_xattr_get_acl(struct dentry *dentry, const char *name,
+ void *buffer, size_t size, int type)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
+ struct inode *inode = dentry->d_inode;
+ struct posix_acl *acl;
+ int error;
+
+ if (!test_opt(sbi, POSIX_ACL))
+ return -EOPNOTSUPP;
+
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+
+ acl = f2fs_get_acl(inode, type);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (!acl)
+ return -ENODATA;
+
+ error = posix_acl_to_xattr(acl, buffer, size);
+ posix_acl_release(acl);
+
+ return error;
+}
+
+static int f2fs_xattr_set_acl(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags, int type)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
+ struct inode *inode = dentry->d_inode;
+ struct posix_acl *acl = NULL;
+ int error;
+
+ if (!test_opt(sbi, POSIX_ACL))
+ return -EOPNOTSUPP;
+
+ if (strcmp(name, "") != 0)
+ return -EINVAL;
+
+ if (!inode_owner_or_capable(inode))
+ return -EPERM;
+
+ if (value) {
+ acl = posix_acl_from_xattr(value, size);
+ if (IS_ERR(acl))
+ return PTR_ERR(acl);
+ if (acl) {
+ error = posix_acl_valid(acl);
+ if (error)
+ goto release_and_out;
+ }
+ } else {
+ acl = NULL;
+ }
+
+ error = f2fs_set_acl(inode, type, acl);
+
+release_and_out:
+ posix_acl_release(acl);
+ return error;
+}
+
+const struct xattr_handler f2fs_xattr_acl_default_handler = {
+ .prefix = POSIX_ACL_XATTR_DEFAULT,
+ .flags = ACL_TYPE_DEFAULT,
+ .list = f2fs_xattr_list_acl,
+ .get = f2fs_xattr_get_acl,
+ .set = f2fs_xattr_set_acl,
+};
+
+const struct xattr_handler f2fs_xattr_acl_access_handler = {
+ .prefix = POSIX_ACL_XATTR_ACCESS,
+ .flags = ACL_TYPE_ACCESS,
+ .list = f2fs_xattr_list_acl,
+ .get = f2fs_xattr_get_acl,
+ .set = f2fs_xattr_set_acl,
+};
diff --git a/fs/f2fs/acl.h b/fs/f2fs/acl.h
new file mode 100644
index 0000000..c97675e
--- /dev/null
+++ b/fs/f2fs/acl.h
@@ -0,0 +1,57 @@
+/**
+ * fs/f2fs/acl.h
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * Portions of this code from linux/fs/ext2/acl.h
+ *
+ * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@...e.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __F2FS_ACL_H__
+#define __F2FS_ACL_H__
+
+#include <linux/posix_acl_xattr.h>
+
+#define F2FS_ACL_VERSION 0x0001
+
+struct f2fs_acl_entry {
+ __le16 e_tag;
+ __le16 e_perm;
+ __le32 e_id;
+};
+
+struct f2fs_acl_entry_short {
+ __le16 e_tag;
+ __le16 e_perm;
+};
+
+struct f2fs_acl_header {
+ __le32 a_version;
+};
+
+#ifdef CONFIG_F2FS_FS_POSIX_ACL
+
+extern struct posix_acl *f2fs_get_acl(struct inode *inode, int type);
+extern int f2fs_acl_chmod(struct inode *inode);
+extern int f2fs_init_acl(struct inode *inode, struct inode *dir);
+#else
+#define f2fs_check_acl NULL
+#define f2fs_get_acl NULL
+#define f2fs_set_acl NULL
+
+static inline int f2fs_acl_chmod(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int f2fs_init_acl(struct inode *inode, struct inode *dir)
+{
+ return 0;
+}
+#endif
+#endif /* __F2FS_ACL_H__ */
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
new file mode 100644
index 0000000..5e618b3
--- /dev/null
+++ b/fs/f2fs/xattr.c
@@ -0,0 +1,387 @@
+/**
+ * fs/f2fs/xattr.c
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * Portions of this code from linux/fs/ext2/xattr.c
+ *
+ * Copyright (C) 2001-2003 Andreas Gruenbacher <agruen@...e.de>
+ *
+ * Fix by Harrison Xing <harrison@...ntainviewdata.com>.
+ * Extended attributes for symlinks and special files added per
+ * suggestion of Luka Renko <luka.renko@...mes.si>.
+ * xattr consolidation Copyright (c) 2004 James Morris <jmorris@...hat.com>,
+ * Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/rwsem.h>
+#include <linux/f2fs_fs.h>
+#include "f2fs.h"
+#include "xattr.h"
+
+static size_t f2fs_xattr_generic_list(struct dentry *dentry, char *list,
+ size_t list_size, const char *name, size_t name_len, int type)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
+ int total_len, prefix_len = 0;
+ const char *prefix = NULL;
+
+ switch (type) {
+ case F2FS_XATTR_INDEX_USER:
+ if (!test_opt(sbi, XATTR_USER))
+ return -EOPNOTSUPP;
+ prefix = XATTR_USER_PREFIX;
+ prefix_len = XATTR_USER_PREFIX_LEN;
+ break;
+ case F2FS_XATTR_INDEX_TRUSTED:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ prefix = XATTR_TRUSTED_PREFIX;
+ prefix_len = XATTR_TRUSTED_PREFIX_LEN;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ total_len = prefix_len + name_len + 1;
+ if (list && total_len <= list_size) {
+ memcpy(list, prefix, prefix_len);
+ memcpy(list+prefix_len, name, name_len);
+ list[prefix_len + name_len] = '\0';
+ }
+ return total_len;
+}
+
+static int f2fs_xattr_generic_get(struct dentry *dentry, const char *name,
+ void *buffer, size_t size, int type)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
+
+ switch (type) {
+ case F2FS_XATTR_INDEX_USER:
+ if (!test_opt(sbi, XATTR_USER))
+ return -EOPNOTSUPP;
+ break;
+ case F2FS_XATTR_INDEX_TRUSTED:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+ return f2fs_getxattr(dentry->d_inode, type, name,
+ buffer, size);
+}
+
+static int f2fs_xattr_generic_set(struct dentry *dentry, const char *name,
+ const void *value, size_t size, int flags, int type)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb);
+
+ switch (type) {
+ case F2FS_XATTR_INDEX_USER:
+ if (!test_opt(sbi, XATTR_USER))
+ return -EOPNOTSUPP;
+ break;
+ case F2FS_XATTR_INDEX_TRUSTED:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+
+ return f2fs_setxattr(dentry->d_inode, type, name, value, size);
+}
+
+const struct xattr_handler f2fs_xattr_user_handler = {
+ .prefix = XATTR_USER_PREFIX,
+ .flags = F2FS_XATTR_INDEX_USER,
+ .list = f2fs_xattr_generic_list,
+ .get = f2fs_xattr_generic_get,
+ .set = f2fs_xattr_generic_set,
+};
+
+const struct xattr_handler f2fs_xattr_trusted_handler = {
+ .prefix = XATTR_TRUSTED_PREFIX,
+ .flags = F2FS_XATTR_INDEX_TRUSTED,
+ .list = f2fs_xattr_generic_list,
+ .get = f2fs_xattr_generic_get,
+ .set = f2fs_xattr_generic_set,
+};
+
+static const struct xattr_handler *f2fs_xattr_handler_map[] = {
+ [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
+#ifdef CONFIG_F2FS_FS_POSIX_ACL
+ [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &f2fs_xattr_acl_access_handler,
+ [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &f2fs_xattr_acl_default_handler,
+#endif
+ [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
+};
+
+const struct xattr_handler *f2fs_xattr_handlers[] = {
+ &f2fs_xattr_user_handler,
+#ifdef CONFIG_F2FS_FS_POSIX_ACL
+ &f2fs_xattr_acl_access_handler,
+ &f2fs_xattr_acl_default_handler,
+#endif
+ &f2fs_xattr_trusted_handler,
+ NULL,
+};
+
+static inline const struct xattr_handler *f2fs_xattr_handler(int name_index)
+{
+ const struct xattr_handler *handler = NULL;
+
+ if (name_index > 0 && name_index < ARRAY_SIZE(f2fs_xattr_handler_map))
+ handler = f2fs_xattr_handler_map[name_index];
+ return handler;
+}
+
+int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
+ void *buffer, size_t buffer_size)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+ struct f2fs_inode_info *fi = F2FS_I(inode);
+ struct f2fs_xattr_entry *entry;
+ struct page *page;
+ void *base_addr;
+ int error = 0, found = 0;
+ int value_len, name_len;
+
+ if (name == NULL)
+ return -EINVAL;
+ name_len = strlen(name);
+
+ if (!fi->i_xattr_nid)
+ return -ENODATA;
+
+ page = get_node_page(sbi, fi->i_xattr_nid);
+ base_addr = page_address(page);
+
+ list_for_each_xattr(entry, base_addr) {
+ if (entry->e_name_index != name_index)
+ continue;
+ if (entry->e_name_len != name_len)
+ continue;
+ if (!memcmp(entry->e_name, name, name_len)) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found) {
+ error = -ENODATA;
+ goto cleanup;
+ }
+
+ value_len = le16_to_cpu(entry->e_value_size);
+
+ if (buffer && value_len > buffer_size) {
+ error = -ERANGE;
+ goto cleanup;
+ }
+
+ if (buffer) {
+ char *pval = entry->e_name + entry->e_name_len;
+ memcpy(buffer, pval, value_len);
+ }
+ error = value_len;
+
+cleanup:
+ f2fs_put_page(page, 1);
+ return error;
+}
+
+ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
+{
+ struct inode *inode = dentry->d_inode;
+ struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+ struct f2fs_inode_info *fi = F2FS_I(inode);
+ struct f2fs_xattr_entry *entry;
+ struct page *page;
+ void *base_addr;
+ int error = 0;
+ size_t rest = buffer_size;
+
+ if (!fi->i_xattr_nid)
+ return 0;
+
+ page = get_node_page(sbi, fi->i_xattr_nid);
+ base_addr = page_address(page);
+
+ list_for_each_xattr(entry, base_addr) {
+ const struct xattr_handler *handler =
+ f2fs_xattr_handler(entry->e_name_index);
+ size_t size;
+
+ if (!handler)
+ continue;
+
+ size = handler->list(dentry, buffer, rest, entry->e_name,
+ entry->e_name_len, handler->flags);
+ if (buffer && size > rest) {
+ error = -ERANGE;
+ goto cleanup;
+ }
+
+ if (buffer)
+ buffer += size;
+ rest -= size;
+ }
+ error = buffer_size - rest;
+cleanup:
+ f2fs_put_page(page, 1);
+ return error;
+}
+
+int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
+ const void *value, size_t value_len)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
+ struct f2fs_inode_info *fi = F2FS_I(inode);
+ struct f2fs_xattr_header *header = NULL;
+ struct f2fs_xattr_entry *here, *last;
+ struct page *page;
+ void *base_addr;
+ int error, found, free, name_len, newsize;
+ char *pval;
+
+ if (name == NULL)
+ return -EINVAL;
+ name_len = strlen(name);
+
+ if (value == NULL)
+ value_len = 0;
+
+ if (name_len > 255 || value_len > MAX_VALUE_LEN)
+ return -ERANGE;
+
+ mutex_lock_op(sbi, NODE_NEW);
+ if (!fi->i_xattr_nid) {
+ /* Allocate new attribute block */
+ struct dnode_of_data dn;
+
+ if (!alloc_nid(sbi, &fi->i_xattr_nid)) {
+ mutex_unlock_op(sbi, NODE_NEW);
+ return -ENOSPC;
+ }
+ set_new_dnode(&dn, inode, NULL, NULL, fi->i_xattr_nid);
+ mark_inode_dirty(inode);
+
+ page = new_node_page(&dn, XATTR_NODE_OFFSET);
+ if (IS_ERR(page)) {
+ alloc_nid_failed(sbi, fi->i_xattr_nid);
+ fi->i_xattr_nid = 0;
+ mutex_unlock_op(sbi, NODE_NEW);
+ return PTR_ERR(page);
+ }
+
+ alloc_nid_done(sbi, fi->i_xattr_nid);
+ base_addr = page_address(page);
+ header = XATTR_HDR(base_addr);
+ header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);
+ header->h_refcount = cpu_to_le32(1);
+ } else {
+ /* The inode already has an extended attribute block. */
+ page = get_node_page(sbi, fi->i_xattr_nid);
+ if (IS_ERR(page)) {
+ mutex_unlock_op(sbi, NODE_NEW);
+ return PTR_ERR(page);
+ }
+
+ base_addr = page_address(page);
+ header = XATTR_HDR(base_addr);
+ }
+
+ if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {
+ error = -EIO;
+ goto cleanup;
+ }
+
+ /* find entry with wanted name. */
+ found = 0;
+ list_for_each_xattr(here, base_addr) {
+ if (here->e_name_index != name_index)
+ continue;
+ if (here->e_name_len != name_len)
+ continue;
+ if (!memcmp(here->e_name, name, name_len)) {
+ found = 1;
+ break;
+ }
+ }
+
+ last = here;
+
+ while (!IS_XATTR_LAST_ENTRY(last))
+ last = XATTR_NEXT_ENTRY(last);
+
+ newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) +
+ name_len + value_len);
+
+ /* 1. Check space */
+ if (value) {
+ /* If value is NULL, it is remove operation.
+ * In case of update operation, we caculate free.
+ */
+ free = MIN_OFFSET - ((char *)last - (char *)header);
+ if (found)
+ free = free - ENTRY_SIZE(here);
+
+ if (free < newsize) {
+ error = -ENOSPC;
+ goto cleanup;
+ }
+ }
+
+ /* 2. Remove old entry */
+ if (found) {
+ /* If entry is found, remove old entry.
+ * If not found, remove operation is not needed.
+ */
+ struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
+ int oldsize = ENTRY_SIZE(here);
+
+ memmove(here, next, (char *)last - (char *)next);
+ last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
+ memset(last, 0, oldsize);
+ }
+
+ /* 3. Write new entry */
+ if (value) {
+ /* Before we come here, old entry is removed.
+ * We just write new entry. */
+ memset(last, 0, newsize);
+ last->e_name_index = name_index;
+ last->e_name_len = name_len;
+ memcpy(last->e_name, name, name_len);
+ pval = last->e_name + name_len;
+ memcpy(pval, value, value_len);
+ last->e_value_size = cpu_to_le16(value_len);
+ }
+
+ set_page_dirty(page);
+ f2fs_put_page(page, 1);
+
+ if (is_inode_flag_set(fi, FI_ACL_MODE)) {
+ inode->i_mode = fi->i_acl_mode;
+ inode->i_ctime = CURRENT_TIME_SEC;
+ clear_inode_flag(fi, FI_ACL_MODE);
+ }
+ f2fs_write_inode(inode, NULL);
+ mutex_unlock_op(sbi, NODE_NEW);
+
+ return 0;
+cleanup:
+ f2fs_put_page(page, 1);
+ mutex_unlock_op(sbi, NODE_NEW);
+ return error;
+}
diff --git a/fs/f2fs/xattr.h b/fs/f2fs/xattr.h
new file mode 100644
index 0000000..583ca25
--- /dev/null
+++ b/fs/f2fs/xattr.h
@@ -0,0 +1,142 @@
+/**
+ * fs/f2fs/xattr.h
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * Portions of this code from linux/fs/ext2/xattr.h
+ *
+ * On-disk format of extended attributes for the ext2 filesystem.
+ *
+ * (C) 2001 Andreas Gruenbacher, <a.gruenbacher@...puter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __F2FS_XATTR_H__
+#define __F2FS_XATTR_H__
+
+#include <linux/init.h>
+#include <linux/xattr.h>
+
+/* Magic value in attribute blocks */
+#define F2FS_XATTR_MAGIC 0xF2F52011
+
+/* Maximum number of references to one attribute block */
+#define F2FS_XATTR_REFCOUNT_MAX 1024
+
+/* Name indexes */
+#define F2FS_XATTR_INDEX_USER 1
+#define F2FS_XATTR_INDEX_POSIX_ACL_ACCESS 2
+#define F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT 3
+#define F2FS_XATTR_INDEX_TRUSTED 4
+#define F2FS_XATTR_INDEX_LUSTRE 5
+#define F2FS_XATTR_INDEX_SECURITY 6
+
+struct f2fs_xattr_header {
+ __le32 h_magic; /* magic number for identification */
+ __le32 h_refcount; /* reference count */
+ __u32 h_reserved[4]; /* zero right now */
+};
+
+struct f2fs_xattr_entry {
+ __u8 e_name_index;
+ __u8 e_name_len;
+ __le16 e_value_size; /* size of attribute value */
+ char e_name[0]; /* attribute name */
+};
+
+#define XATTR_HDR(ptr) ((struct f2fs_xattr_header *)(ptr))
+#define XATTR_ENTRY(ptr) ((struct f2fs_xattr_entry *)(ptr))
+#define XATTR_FIRST_ENTRY(ptr) (XATTR_ENTRY(XATTR_HDR(ptr)+1))
+#define XATTR_ROUND (3)
+
+#define XATTR_ALIGN(size) ((size + XATTR_ROUND) & ~XATTR_ROUND)
+
+#define ENTRY_SIZE(entry) (XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + \
+ entry->e_name_len + le16_to_cpu(entry->e_value_size)))
+
+#define XATTR_NEXT_ENTRY(entry) ((struct f2fs_xattr_entry *)((char *)(entry) +\
+ ENTRY_SIZE(entry)))
+
+#define IS_XATTR_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
+
+#define list_for_each_xattr(entry, addr) \
+ for (entry = XATTR_FIRST_ENTRY(addr);\
+ !IS_XATTR_LAST_ENTRY(entry);\
+ entry = XATTR_NEXT_ENTRY(entry))
+
+
+#define MIN_OFFSET XATTR_ALIGN(PAGE_SIZE - \
+ sizeof(struct node_footer) - \
+ sizeof(__u32))
+
+#define MAX_VALUE_LEN (MIN_OFFSET - sizeof(struct f2fs_xattr_header) - \
+ sizeof(struct f2fs_xattr_entry))
+
+/**
+ * On-disk structure of f2fs_xattr
+ * We use only 1 block for xattr.
+ *
+ * +--------------------+
+ * | f2fs_xattr_header |
+ * | |
+ * +--------------------+
+ * | f2fs_xattr_entry |
+ * | .e_name_index = 1 |
+ * | .e_name_len = 3 |
+ * | .e_value_size = 14 |
+ * | .e_name = "foo" |
+ * | "value_of_xattr" |<- value_offs = e_name + e_name_len
+ * +--------------------+
+ * | f2fs_xattr_entry |
+ * | .e_name_index = 4 |
+ * | .e_name = "bar" |
+ * +--------------------+
+ * | |
+ * | Free |
+ * | |
+ * +--------------------+<- MIN_OFFSET
+ * | node_footer |
+ * | (nid, ino, offset) |
+ * +--------------------+
+ *
+ **/
+
+#ifdef CONFIG_F2FS_FS_XATTR
+extern const struct xattr_handler f2fs_xattr_user_handler;
+extern const struct xattr_handler f2fs_xattr_trusted_handler;
+extern const struct xattr_handler f2fs_xattr_acl_access_handler;
+extern const struct xattr_handler f2fs_xattr_acl_default_handler;
+
+extern const struct xattr_handler *f2fs_xattr_handlers[];
+
+extern int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
+ const void *value, size_t value_len);
+extern int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
+ void *buffer, size_t buffer_size);
+extern ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
+ size_t buffer_size);
+
+#else
+
+#define f2fs_xattr_handlers NULL
+static inline int f2fs_setxattr(struct inode *inode, int name_index,
+ const char *name, const void *value, size_t value_len)
+{
+ return -EOPNOTSUPP;
+}
+static inline int f2fs_getxattr(struct inode *inode, int name_index,
+ const char *name, void *buffer, size_t buffer_size)
+{
+ return -EOPNOTSUPP;
+}
+static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
+ size_t buffer_size)
+{
+ return -EOPNOTSUPP;
+}
+#endif
+
+#endif /* __F2FS_XATTR_H__ */
--
1.7.9.5
---
Jaegeuk Kim
Samsung
--
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