static int get_max_inline_xattr_value_size(struct inode *inode, struct ext4_iloc *iloc) { struct ext4_xattr_ibody_header *header; struct ext4_xattr_entry *entry; struct ext4_inode *raw_inode; int free, min_offs; min_offs = EXT4_SB(inode->i_sb)->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE - EXT4_I(inode)->i_extra_isize - sizeof(struct ext4_xattr_ibody_header); /* * We need to subtract another sizeof(__u32) since an in-inode xattr * needs an empty 4 bytes to indicate the gap between the xattr entry * and the name/value pair. */ if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) return EXT4_XATTR_SIZE(min_offs - EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) - EXT4_XATTR_ROUND - sizeof(__u32)); raw_inode = ext4_raw_inode(iloc); header = IHDR(inode, raw_inode); entry = IFIRST(header); /* Compute min_offs. */ for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { if (!entry->e_value_block && entry->e_value_size) { size_t offs = le16_to_cpu(entry->e_value_offs); if (offs < min_offs) min_offs = offs; } } free = min_offs - ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32); if (EXT4_I(inode)->i_inline_off) { entry = (struct ext4_xattr_entry *) ((void *)raw_inode + EXT4_I(inode)->i_inline_off); free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); goto out; } free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)); if (free > EXT4_XATTR_ROUND) free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND); else free = 0; out: return free; }
static int get_max_inline_xattr_value_size(struct inode *inode, struct ext4_iloc *iloc) { struct ext4_xattr_ibody_header *header; struct ext4_xattr_entry *entry; struct ext4_inode *raw_inode; int free, min_offs; if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) return EXT4_XATTR_SIZE(EXT4_SB(inode->i_sb)->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE - EXT4_I(inode)->i_extra_isize - sizeof(struct ext4_xattr_ibody_header) - EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA_NAME)) - EXT4_XATTR_ROUND - sizeof(__u32)); down_read(&EXT4_I(inode)->xattr_sem); raw_inode = ext4_raw_inode(iloc); header = IHDR(inode, raw_inode); entry = IFIRST(header); min_offs = EXT4_SB(inode->i_sb)->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE - EXT4_I(inode)->i_extra_isize - sizeof(struct ext4_xattr_ibody_header); /* Compute min_offs. */ for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { if (!entry->e_value_block && entry->e_value_size) { size_t offs = le16_to_cpu(entry->e_value_offs); if (offs < min_offs) min_offs = offs; } } free = min_offs - ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32); if (EXT4_I(inode)->i_inline_off) { entry = (struct ext4_xattr_entry *) ((void *)raw_inode + EXT4_I(inode)->i_inline_off); free += le32_to_cpu(entry->e_value_size); goto out; } free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA_NAME)); if (free > EXT4_XATTR_ROUND) free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND); else free = 0; out: up_read(&EXT4_I(inode)->xattr_sem); return free; }