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435 lines
9.5 KiB
435 lines
9.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* fs/f2fs/acl.c |
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* |
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* Copyright (c) 2012 Samsung Electronics Co., Ltd. |
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* http://www.samsung.com/ |
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* |
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* Portions of this code from linux/fs/ext2/acl.c |
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* |
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* Copyright (C) 2001-2003 Andreas Gruenbacher, <[email protected]> |
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*/ |
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#include <linux/f2fs_fs.h> |
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#include "f2fs.h" |
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#include "xattr.h" |
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#include "acl.h" |
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|
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static inline size_t f2fs_acl_size(int count) |
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{ |
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if (count <= 4) { |
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return sizeof(struct f2fs_acl_header) + |
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count * sizeof(struct f2fs_acl_entry_short); |
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} else { |
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return sizeof(struct f2fs_acl_header) + |
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4 * sizeof(struct f2fs_acl_entry_short) + |
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(count - 4) * sizeof(struct f2fs_acl_entry); |
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} |
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} |
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static inline int f2fs_acl_count(size_t size) |
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{ |
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ssize_t s; |
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size -= sizeof(struct f2fs_acl_header); |
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s = size - 4 * sizeof(struct f2fs_acl_entry_short); |
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if (s < 0) { |
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if (size % sizeof(struct f2fs_acl_entry_short)) |
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return -1; |
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return size / sizeof(struct f2fs_acl_entry_short); |
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} else { |
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if (s % sizeof(struct f2fs_acl_entry)) |
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return -1; |
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return s / sizeof(struct f2fs_acl_entry) + 4; |
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} |
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} |
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static struct posix_acl *f2fs_acl_from_disk(const char *value, size_t size) |
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{ |
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int i, count; |
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struct posix_acl *acl; |
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struct f2fs_acl_header *hdr = (struct f2fs_acl_header *)value; |
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struct f2fs_acl_entry *entry = (struct f2fs_acl_entry *)(hdr + 1); |
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const char *end = value + size; |
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if (size < sizeof(struct f2fs_acl_header)) |
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return ERR_PTR(-EINVAL); |
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if (hdr->a_version != cpu_to_le32(F2FS_ACL_VERSION)) |
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return ERR_PTR(-EINVAL); |
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count = f2fs_acl_count(size); |
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if (count < 0) |
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return ERR_PTR(-EINVAL); |
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if (count == 0) |
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return NULL; |
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acl = posix_acl_alloc(count, GFP_NOFS); |
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if (!acl) |
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return ERR_PTR(-ENOMEM); |
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for (i = 0; i < count; i++) { |
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if ((char *)entry > end) |
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goto fail; |
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acl->a_entries[i].e_tag = le16_to_cpu(entry->e_tag); |
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acl->a_entries[i].e_perm = le16_to_cpu(entry->e_perm); |
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switch (acl->a_entries[i].e_tag) { |
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case ACL_USER_OBJ: |
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case ACL_GROUP_OBJ: |
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case ACL_MASK: |
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case ACL_OTHER: |
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entry = (struct f2fs_acl_entry *)((char *)entry + |
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sizeof(struct f2fs_acl_entry_short)); |
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break; |
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case ACL_USER: |
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acl->a_entries[i].e_uid = |
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make_kuid(&init_user_ns, |
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le32_to_cpu(entry->e_id)); |
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entry = (struct f2fs_acl_entry *)((char *)entry + |
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sizeof(struct f2fs_acl_entry)); |
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break; |
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case ACL_GROUP: |
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acl->a_entries[i].e_gid = |
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make_kgid(&init_user_ns, |
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le32_to_cpu(entry->e_id)); |
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entry = (struct f2fs_acl_entry *)((char *)entry + |
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sizeof(struct f2fs_acl_entry)); |
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break; |
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default: |
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goto fail; |
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} |
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} |
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if ((char *)entry != end) |
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goto fail; |
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return acl; |
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fail: |
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posix_acl_release(acl); |
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return ERR_PTR(-EINVAL); |
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} |
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static void *f2fs_acl_to_disk(struct f2fs_sb_info *sbi, |
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const struct posix_acl *acl, size_t *size) |
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{ |
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struct f2fs_acl_header *f2fs_acl; |
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struct f2fs_acl_entry *entry; |
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int i; |
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f2fs_acl = f2fs_kmalloc(sbi, sizeof(struct f2fs_acl_header) + |
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acl->a_count * sizeof(struct f2fs_acl_entry), |
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GFP_NOFS); |
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if (!f2fs_acl) |
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return ERR_PTR(-ENOMEM); |
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f2fs_acl->a_version = cpu_to_le32(F2FS_ACL_VERSION); |
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entry = (struct f2fs_acl_entry *)(f2fs_acl + 1); |
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for (i = 0; i < acl->a_count; i++) { |
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entry->e_tag = cpu_to_le16(acl->a_entries[i].e_tag); |
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entry->e_perm = cpu_to_le16(acl->a_entries[i].e_perm); |
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switch (acl->a_entries[i].e_tag) { |
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case ACL_USER: |
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entry->e_id = cpu_to_le32( |
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from_kuid(&init_user_ns, |
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acl->a_entries[i].e_uid)); |
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entry = (struct f2fs_acl_entry *)((char *)entry + |
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sizeof(struct f2fs_acl_entry)); |
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break; |
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case ACL_GROUP: |
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entry->e_id = cpu_to_le32( |
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from_kgid(&init_user_ns, |
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acl->a_entries[i].e_gid)); |
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entry = (struct f2fs_acl_entry *)((char *)entry + |
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sizeof(struct f2fs_acl_entry)); |
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break; |
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case ACL_USER_OBJ: |
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case ACL_GROUP_OBJ: |
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case ACL_MASK: |
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case ACL_OTHER: |
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entry = (struct f2fs_acl_entry *)((char *)entry + |
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sizeof(struct f2fs_acl_entry_short)); |
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break; |
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default: |
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goto fail; |
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} |
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} |
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*size = f2fs_acl_size(acl->a_count); |
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return (void *)f2fs_acl; |
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fail: |
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kfree(f2fs_acl); |
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return ERR_PTR(-EINVAL); |
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} |
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static struct posix_acl *__f2fs_get_acl(struct inode *inode, int type, |
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struct page *dpage) |
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{ |
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int name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT; |
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void *value = NULL; |
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struct posix_acl *acl; |
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int retval; |
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if (type == ACL_TYPE_ACCESS) |
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name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS; |
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retval = f2fs_getxattr(inode, name_index, "", NULL, 0, dpage); |
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if (retval > 0) { |
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value = f2fs_kmalloc(F2FS_I_SB(inode), retval, GFP_F2FS_ZERO); |
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if (!value) |
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return ERR_PTR(-ENOMEM); |
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retval = f2fs_getxattr(inode, name_index, "", value, |
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retval, dpage); |
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} |
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if (retval > 0) |
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acl = f2fs_acl_from_disk(value, retval); |
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else if (retval == -ENODATA) |
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acl = NULL; |
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else |
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acl = ERR_PTR(retval); |
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kfree(value); |
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return acl; |
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} |
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struct posix_acl *f2fs_get_acl(struct inode *inode, int type) |
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{ |
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return __f2fs_get_acl(inode, type, NULL); |
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} |
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static int f2fs_acl_update_mode(struct inode *inode, umode_t *mode_p, |
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struct posix_acl **acl) |
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{ |
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umode_t mode = inode->i_mode; |
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int error; |
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if (is_inode_flag_set(inode, FI_ACL_MODE)) |
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mode = F2FS_I(inode)->i_acl_mode; |
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error = posix_acl_equiv_mode(*acl, &mode); |
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if (error < 0) |
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return error; |
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if (error == 0) |
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*acl = NULL; |
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if (!in_group_p(i_gid_into_mnt(&init_user_ns, inode)) && |
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!capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID)) |
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mode &= ~S_ISGID; |
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*mode_p = mode; |
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return 0; |
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} |
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static int __f2fs_set_acl(struct inode *inode, int type, |
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struct posix_acl *acl, struct page *ipage) |
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{ |
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int name_index; |
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void *value = NULL; |
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size_t size = 0; |
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int error; |
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umode_t mode = inode->i_mode; |
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switch (type) { |
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case ACL_TYPE_ACCESS: |
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name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS; |
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if (acl && !ipage) { |
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error = f2fs_acl_update_mode(inode, &mode, &acl); |
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if (error) |
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return error; |
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set_acl_inode(inode, mode); |
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} |
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break; |
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case ACL_TYPE_DEFAULT: |
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name_index = F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT; |
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if (!S_ISDIR(inode->i_mode)) |
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return acl ? -EACCES : 0; |
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break; |
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default: |
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return -EINVAL; |
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} |
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if (acl) { |
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value = f2fs_acl_to_disk(F2FS_I_SB(inode), acl, &size); |
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if (IS_ERR(value)) { |
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clear_inode_flag(inode, FI_ACL_MODE); |
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return PTR_ERR(value); |
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} |
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} |
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error = f2fs_setxattr(inode, name_index, "", value, size, ipage, 0); |
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kfree(value); |
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if (!error) |
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set_cached_acl(inode, type, acl); |
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clear_inode_flag(inode, FI_ACL_MODE); |
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return error; |
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} |
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int f2fs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, |
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struct posix_acl *acl, int type) |
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{ |
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if (unlikely(f2fs_cp_error(F2FS_I_SB(inode)))) |
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return -EIO; |
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return __f2fs_set_acl(inode, type, acl, NULL); |
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} |
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/* |
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* Most part of f2fs_acl_clone, f2fs_acl_create_masq, f2fs_acl_create |
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* are copied from posix_acl.c |
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*/ |
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static struct posix_acl *f2fs_acl_clone(const struct posix_acl *acl, |
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gfp_t flags) |
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{ |
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struct posix_acl *clone = NULL; |
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if (acl) { |
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int size = sizeof(struct posix_acl) + acl->a_count * |
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sizeof(struct posix_acl_entry); |
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clone = kmemdup(acl, size, flags); |
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if (clone) |
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refcount_set(&clone->a_refcount, 1); |
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} |
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return clone; |
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} |
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static int f2fs_acl_create_masq(struct posix_acl *acl, umode_t *mode_p) |
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{ |
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struct posix_acl_entry *pa, *pe; |
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struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL; |
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umode_t mode = *mode_p; |
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int not_equiv = 0; |
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/* assert(atomic_read(acl->a_refcount) == 1); */ |
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FOREACH_ACL_ENTRY(pa, acl, pe) { |
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switch (pa->e_tag) { |
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case ACL_USER_OBJ: |
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pa->e_perm &= (mode >> 6) | ~S_IRWXO; |
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mode &= (pa->e_perm << 6) | ~S_IRWXU; |
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break; |
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case ACL_USER: |
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case ACL_GROUP: |
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not_equiv = 1; |
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break; |
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case ACL_GROUP_OBJ: |
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group_obj = pa; |
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break; |
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case ACL_OTHER: |
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pa->e_perm &= mode | ~S_IRWXO; |
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mode &= pa->e_perm | ~S_IRWXO; |
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break; |
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case ACL_MASK: |
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mask_obj = pa; |
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not_equiv = 1; |
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break; |
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default: |
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return -EIO; |
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} |
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} |
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if (mask_obj) { |
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mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO; |
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mode &= (mask_obj->e_perm << 3) | ~S_IRWXG; |
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} else { |
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if (!group_obj) |
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return -EIO; |
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group_obj->e_perm &= (mode >> 3) | ~S_IRWXO; |
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mode &= (group_obj->e_perm << 3) | ~S_IRWXG; |
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} |
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*mode_p = (*mode_p & ~S_IRWXUGO) | mode; |
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return not_equiv; |
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} |
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static int f2fs_acl_create(struct inode *dir, umode_t *mode, |
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struct posix_acl **default_acl, struct posix_acl **acl, |
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struct page *dpage) |
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{ |
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struct posix_acl *p; |
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struct posix_acl *clone; |
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int ret; |
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*acl = NULL; |
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*default_acl = NULL; |
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if (S_ISLNK(*mode) || !IS_POSIXACL(dir)) |
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return 0; |
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p = __f2fs_get_acl(dir, ACL_TYPE_DEFAULT, dpage); |
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if (!p || p == ERR_PTR(-EOPNOTSUPP)) { |
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*mode &= ~current_umask(); |
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return 0; |
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} |
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if (IS_ERR(p)) |
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return PTR_ERR(p); |
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clone = f2fs_acl_clone(p, GFP_NOFS); |
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if (!clone) { |
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ret = -ENOMEM; |
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goto release_acl; |
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} |
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ret = f2fs_acl_create_masq(clone, mode); |
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if (ret < 0) |
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goto release_clone; |
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if (ret == 0) |
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posix_acl_release(clone); |
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else |
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*acl = clone; |
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if (!S_ISDIR(*mode)) |
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posix_acl_release(p); |
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else |
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*default_acl = p; |
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return 0; |
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release_clone: |
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posix_acl_release(clone); |
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release_acl: |
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posix_acl_release(p); |
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return ret; |
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} |
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int f2fs_init_acl(struct inode *inode, struct inode *dir, struct page *ipage, |
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struct page *dpage) |
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{ |
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struct posix_acl *default_acl = NULL, *acl = NULL; |
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int error; |
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error = f2fs_acl_create(dir, &inode->i_mode, &default_acl, &acl, dpage); |
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if (error) |
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return error; |
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f2fs_mark_inode_dirty_sync(inode, true); |
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if (default_acl) { |
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error = __f2fs_set_acl(inode, ACL_TYPE_DEFAULT, default_acl, |
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ipage); |
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posix_acl_release(default_acl); |
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} else { |
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inode->i_default_acl = NULL; |
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} |
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if (acl) { |
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if (!error) |
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error = __f2fs_set_acl(inode, ACL_TYPE_ACCESS, acl, |
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ipage); |
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posix_acl_release(acl); |
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} else { |
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inode->i_acl = NULL; |
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} |
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return error; |
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}
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