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1996 lines
48 KiB
1996 lines
48 KiB
// SPDX-License-Identifier: LGPL-2.1 |
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/* |
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* Copyright (c) 2012 Taobao. |
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* Written by Tao Ma <[email protected]> |
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*/ |
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|
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#include <linux/iomap.h> |
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#include <linux/fiemap.h> |
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#include <linux/iversion.h> |
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|
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#include "ext4_jbd2.h" |
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#include "ext4.h" |
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#include "xattr.h" |
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#include "truncate.h" |
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#define EXT4_XATTR_SYSTEM_DATA "data" |
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#define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS)) |
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#define EXT4_INLINE_DOTDOT_OFFSET 2 |
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#define EXT4_INLINE_DOTDOT_SIZE 4 |
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|
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static int ext4_get_inline_size(struct inode *inode) |
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{ |
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if (EXT4_I(inode)->i_inline_off) |
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return EXT4_I(inode)->i_inline_size; |
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|
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return 0; |
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} |
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static int get_max_inline_xattr_value_size(struct inode *inode, |
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struct ext4_iloc *iloc) |
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{ |
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struct ext4_xattr_ibody_header *header; |
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struct ext4_xattr_entry *entry; |
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struct ext4_inode *raw_inode; |
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int free, min_offs; |
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min_offs = EXT4_SB(inode->i_sb)->s_inode_size - |
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EXT4_GOOD_OLD_INODE_SIZE - |
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EXT4_I(inode)->i_extra_isize - |
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sizeof(struct ext4_xattr_ibody_header); |
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|
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/* |
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* We need to subtract another sizeof(__u32) since an in-inode xattr |
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* needs an empty 4 bytes to indicate the gap between the xattr entry |
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* and the name/value pair. |
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*/ |
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if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR)) |
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return EXT4_XATTR_SIZE(min_offs - |
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EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) - |
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EXT4_XATTR_ROUND - sizeof(__u32)); |
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|
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raw_inode = ext4_raw_inode(iloc); |
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header = IHDR(inode, raw_inode); |
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entry = IFIRST(header); |
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|
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/* Compute min_offs. */ |
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for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) { |
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if (!entry->e_value_inum && entry->e_value_size) { |
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size_t offs = le16_to_cpu(entry->e_value_offs); |
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if (offs < min_offs) |
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min_offs = offs; |
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} |
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} |
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free = min_offs - |
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((void *)entry - (void *)IFIRST(header)) - sizeof(__u32); |
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|
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if (EXT4_I(inode)->i_inline_off) { |
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entry = (struct ext4_xattr_entry *) |
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((void *)raw_inode + EXT4_I(inode)->i_inline_off); |
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free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)); |
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goto out; |
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} |
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free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)); |
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if (free > EXT4_XATTR_ROUND) |
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free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND); |
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else |
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free = 0; |
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out: |
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return free; |
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} |
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|
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/* |
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* Get the maximum size we now can store in an inode. |
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* If we can't find the space for a xattr entry, don't use the space |
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* of the extents since we have no space to indicate the inline data. |
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*/ |
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int ext4_get_max_inline_size(struct inode *inode) |
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{ |
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int error, max_inline_size; |
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struct ext4_iloc iloc; |
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if (EXT4_I(inode)->i_extra_isize == 0) |
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return 0; |
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error = ext4_get_inode_loc(inode, &iloc); |
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if (error) { |
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ext4_error_inode_err(inode, __func__, __LINE__, 0, -error, |
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"can't get inode location %lu", |
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inode->i_ino); |
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return 0; |
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} |
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down_read(&EXT4_I(inode)->xattr_sem); |
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max_inline_size = get_max_inline_xattr_value_size(inode, &iloc); |
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up_read(&EXT4_I(inode)->xattr_sem); |
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brelse(iloc.bh); |
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if (!max_inline_size) |
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return 0; |
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return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE; |
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} |
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/* |
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* this function does not take xattr_sem, which is OK because it is |
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* currently only used in a code path coming form ext4_iget, before |
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* the new inode has been unlocked |
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*/ |
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int ext4_find_inline_data_nolock(struct inode *inode) |
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{ |
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struct ext4_xattr_ibody_find is = { |
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.s = { .not_found = -ENODATA, }, |
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}; |
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struct ext4_xattr_info i = { |
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.name_index = EXT4_XATTR_INDEX_SYSTEM, |
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.name = EXT4_XATTR_SYSTEM_DATA, |
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}; |
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int error; |
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if (EXT4_I(inode)->i_extra_isize == 0) |
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return 0; |
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error = ext4_get_inode_loc(inode, &is.iloc); |
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if (error) |
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return error; |
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error = ext4_xattr_ibody_find(inode, &i, &is); |
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if (error) |
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goto out; |
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|
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if (!is.s.not_found) { |
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if (is.s.here->e_value_inum) { |
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EXT4_ERROR_INODE(inode, "inline data xattr refers " |
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"to an external xattr inode"); |
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error = -EFSCORRUPTED; |
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goto out; |
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} |
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EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
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(void *)ext4_raw_inode(&is.iloc)); |
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EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + |
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le32_to_cpu(is.s.here->e_value_size); |
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ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
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} |
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out: |
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brelse(is.iloc.bh); |
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return error; |
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} |
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static int ext4_read_inline_data(struct inode *inode, void *buffer, |
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unsigned int len, |
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struct ext4_iloc *iloc) |
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{ |
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struct ext4_xattr_entry *entry; |
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struct ext4_xattr_ibody_header *header; |
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int cp_len = 0; |
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struct ext4_inode *raw_inode; |
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if (!len) |
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return 0; |
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BUG_ON(len > EXT4_I(inode)->i_inline_size); |
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cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ? |
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len : EXT4_MIN_INLINE_DATA_SIZE; |
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raw_inode = ext4_raw_inode(iloc); |
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memcpy(buffer, (void *)(raw_inode->i_block), cp_len); |
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len -= cp_len; |
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buffer += cp_len; |
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if (!len) |
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goto out; |
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header = IHDR(inode, raw_inode); |
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entry = (struct ext4_xattr_entry *)((void *)raw_inode + |
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EXT4_I(inode)->i_inline_off); |
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len = min_t(unsigned int, len, |
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(unsigned int)le32_to_cpu(entry->e_value_size)); |
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memcpy(buffer, |
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(void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len); |
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cp_len += len; |
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out: |
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return cp_len; |
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} |
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/* |
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* write the buffer to the inline inode. |
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* If 'create' is set, we don't need to do the extra copy in the xattr |
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* value since it is already handled by ext4_xattr_ibody_set. |
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* That saves us one memcpy. |
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*/ |
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static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc, |
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void *buffer, loff_t pos, unsigned int len) |
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{ |
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struct ext4_xattr_entry *entry; |
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struct ext4_xattr_ibody_header *header; |
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struct ext4_inode *raw_inode; |
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int cp_len = 0; |
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if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb)))) |
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return; |
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BUG_ON(!EXT4_I(inode)->i_inline_off); |
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BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); |
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raw_inode = ext4_raw_inode(iloc); |
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buffer += pos; |
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if (pos < EXT4_MIN_INLINE_DATA_SIZE) { |
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cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ? |
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EXT4_MIN_INLINE_DATA_SIZE - pos : len; |
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memcpy((void *)raw_inode->i_block + pos, buffer, cp_len); |
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len -= cp_len; |
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buffer += cp_len; |
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pos += cp_len; |
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} |
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if (!len) |
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return; |
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pos -= EXT4_MIN_INLINE_DATA_SIZE; |
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header = IHDR(inode, raw_inode); |
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entry = (struct ext4_xattr_entry *)((void *)raw_inode + |
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EXT4_I(inode)->i_inline_off); |
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memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos, |
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buffer, len); |
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} |
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static int ext4_create_inline_data(handle_t *handle, |
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struct inode *inode, unsigned len) |
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{ |
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int error; |
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void *value = NULL; |
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struct ext4_xattr_ibody_find is = { |
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.s = { .not_found = -ENODATA, }, |
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}; |
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struct ext4_xattr_info i = { |
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.name_index = EXT4_XATTR_INDEX_SYSTEM, |
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.name = EXT4_XATTR_SYSTEM_DATA, |
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}; |
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error = ext4_get_inode_loc(inode, &is.iloc); |
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if (error) |
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return error; |
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BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
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error = ext4_journal_get_write_access(handle, is.iloc.bh); |
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if (error) |
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goto out; |
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if (len > EXT4_MIN_INLINE_DATA_SIZE) { |
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value = EXT4_ZERO_XATTR_VALUE; |
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len -= EXT4_MIN_INLINE_DATA_SIZE; |
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} else { |
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value = ""; |
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len = 0; |
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} |
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/* Insert the xttr entry. */ |
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i.value = value; |
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i.value_len = len; |
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error = ext4_xattr_ibody_find(inode, &i, &is); |
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if (error) |
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goto out; |
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BUG_ON(!is.s.not_found); |
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error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
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if (error) { |
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if (error == -ENOSPC) |
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ext4_clear_inode_state(inode, |
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EXT4_STATE_MAY_INLINE_DATA); |
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goto out; |
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} |
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memset((void *)ext4_raw_inode(&is.iloc)->i_block, |
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0, EXT4_MIN_INLINE_DATA_SIZE); |
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EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
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(void *)ext4_raw_inode(&is.iloc)); |
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EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE; |
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ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
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ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA); |
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get_bh(is.iloc.bh); |
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error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
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out: |
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brelse(is.iloc.bh); |
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return error; |
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} |
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static int ext4_update_inline_data(handle_t *handle, struct inode *inode, |
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unsigned int len) |
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{ |
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int error; |
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void *value = NULL; |
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struct ext4_xattr_ibody_find is = { |
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.s = { .not_found = -ENODATA, }, |
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}; |
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struct ext4_xattr_info i = { |
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.name_index = EXT4_XATTR_INDEX_SYSTEM, |
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.name = EXT4_XATTR_SYSTEM_DATA, |
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}; |
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/* If the old space is ok, write the data directly. */ |
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if (len <= EXT4_I(inode)->i_inline_size) |
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return 0; |
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error = ext4_get_inode_loc(inode, &is.iloc); |
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if (error) |
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return error; |
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error = ext4_xattr_ibody_find(inode, &i, &is); |
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if (error) |
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goto out; |
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BUG_ON(is.s.not_found); |
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len -= EXT4_MIN_INLINE_DATA_SIZE; |
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value = kzalloc(len, GFP_NOFS); |
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if (!value) { |
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error = -ENOMEM; |
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goto out; |
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} |
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error = ext4_xattr_ibody_get(inode, i.name_index, i.name, |
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value, len); |
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if (error == -ENODATA) |
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goto out; |
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BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
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error = ext4_journal_get_write_access(handle, is.iloc.bh); |
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if (error) |
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goto out; |
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/* Update the xattr entry. */ |
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i.value = value; |
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i.value_len = len; |
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error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
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if (error) |
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goto out; |
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EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here - |
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(void *)ext4_raw_inode(&is.iloc)); |
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EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE + |
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le32_to_cpu(is.s.here->e_value_size); |
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ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
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get_bh(is.iloc.bh); |
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error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
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out: |
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kfree(value); |
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brelse(is.iloc.bh); |
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return error; |
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} |
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static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode, |
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unsigned int len) |
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{ |
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int ret, size, no_expand; |
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struct ext4_inode_info *ei = EXT4_I(inode); |
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if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) |
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return -ENOSPC; |
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size = ext4_get_max_inline_size(inode); |
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if (size < len) |
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return -ENOSPC; |
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ext4_write_lock_xattr(inode, &no_expand); |
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if (ei->i_inline_off) |
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ret = ext4_update_inline_data(handle, inode, len); |
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else |
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ret = ext4_create_inline_data(handle, inode, len); |
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ext4_write_unlock_xattr(inode, &no_expand); |
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return ret; |
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} |
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static int ext4_destroy_inline_data_nolock(handle_t *handle, |
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struct inode *inode) |
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{ |
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struct ext4_inode_info *ei = EXT4_I(inode); |
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struct ext4_xattr_ibody_find is = { |
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.s = { .not_found = 0, }, |
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}; |
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struct ext4_xattr_info i = { |
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.name_index = EXT4_XATTR_INDEX_SYSTEM, |
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.name = EXT4_XATTR_SYSTEM_DATA, |
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.value = NULL, |
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.value_len = 0, |
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}; |
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int error; |
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if (!ei->i_inline_off) |
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return 0; |
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error = ext4_get_inode_loc(inode, &is.iloc); |
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if (error) |
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return error; |
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error = ext4_xattr_ibody_find(inode, &i, &is); |
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if (error) |
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goto out; |
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BUFFER_TRACE(is.iloc.bh, "get_write_access"); |
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error = ext4_journal_get_write_access(handle, is.iloc.bh); |
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if (error) |
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goto out; |
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error = ext4_xattr_ibody_set(handle, inode, &i, &is); |
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if (error) |
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goto out; |
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memset((void *)ext4_raw_inode(&is.iloc)->i_block, |
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0, EXT4_MIN_INLINE_DATA_SIZE); |
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memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE); |
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|
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if (ext4_has_feature_extents(inode->i_sb)) { |
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if (S_ISDIR(inode->i_mode) || |
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S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) { |
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ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); |
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ext4_ext_tree_init(handle, inode); |
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} |
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} |
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ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA); |
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|
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get_bh(is.iloc.bh); |
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error = ext4_mark_iloc_dirty(handle, inode, &is.iloc); |
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|
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EXT4_I(inode)->i_inline_off = 0; |
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EXT4_I(inode)->i_inline_size = 0; |
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ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
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out: |
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brelse(is.iloc.bh); |
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if (error == -ENODATA) |
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error = 0; |
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return error; |
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} |
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static int ext4_read_inline_page(struct inode *inode, struct page *page) |
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{ |
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void *kaddr; |
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int ret = 0; |
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size_t len; |
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struct ext4_iloc iloc; |
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|
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BUG_ON(!PageLocked(page)); |
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BUG_ON(!ext4_has_inline_data(inode)); |
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BUG_ON(page->index); |
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|
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if (!EXT4_I(inode)->i_inline_off) { |
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ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.", |
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inode->i_ino); |
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goto out; |
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} |
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|
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ret = ext4_get_inode_loc(inode, &iloc); |
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if (ret) |
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goto out; |
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len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode)); |
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kaddr = kmap_atomic(page); |
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ret = ext4_read_inline_data(inode, kaddr, len, &iloc); |
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flush_dcache_page(page); |
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kunmap_atomic(kaddr); |
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zero_user_segment(page, len, PAGE_SIZE); |
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SetPageUptodate(page); |
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brelse(iloc.bh); |
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|
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out: |
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return ret; |
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} |
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|
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int ext4_readpage_inline(struct inode *inode, struct page *page) |
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{ |
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int ret = 0; |
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|
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down_read(&EXT4_I(inode)->xattr_sem); |
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if (!ext4_has_inline_data(inode)) { |
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up_read(&EXT4_I(inode)->xattr_sem); |
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return -EAGAIN; |
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} |
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|
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/* |
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* Current inline data can only exist in the 1st page, |
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* So for all the other pages, just set them uptodate. |
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*/ |
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if (!page->index) |
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ret = ext4_read_inline_page(inode, page); |
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else if (!PageUptodate(page)) { |
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zero_user_segment(page, 0, PAGE_SIZE); |
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SetPageUptodate(page); |
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} |
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|
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up_read(&EXT4_I(inode)->xattr_sem); |
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|
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unlock_page(page); |
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return ret >= 0 ? 0 : ret; |
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} |
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|
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static int ext4_convert_inline_data_to_extent(struct address_space *mapping, |
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struct inode *inode, |
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unsigned flags) |
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{ |
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int ret, needed_blocks, no_expand; |
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handle_t *handle = NULL; |
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int retries = 0, sem_held = 0; |
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struct page *page = NULL; |
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unsigned from, to; |
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struct ext4_iloc iloc; |
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|
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if (!ext4_has_inline_data(inode)) { |
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/* |
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* clear the flag so that no new write |
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* will trap here again. |
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*/ |
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ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
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return 0; |
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} |
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|
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needed_blocks = ext4_writepage_trans_blocks(inode); |
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|
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ret = ext4_get_inode_loc(inode, &iloc); |
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if (ret) |
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return ret; |
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|
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retry: |
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handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
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if (IS_ERR(handle)) { |
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ret = PTR_ERR(handle); |
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handle = NULL; |
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goto out; |
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} |
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|
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/* We cannot recurse into the filesystem as the transaction is already |
|
* started */ |
|
flags |= AOP_FLAG_NOFS; |
|
|
|
page = grab_cache_page_write_begin(mapping, 0, flags); |
|
if (!page) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
ext4_write_lock_xattr(inode, &no_expand); |
|
sem_held = 1; |
|
/* If some one has already done this for us, just exit. */ |
|
if (!ext4_has_inline_data(inode)) { |
|
ret = 0; |
|
goto out; |
|
} |
|
|
|
from = 0; |
|
to = ext4_get_inline_size(inode); |
|
if (!PageUptodate(page)) { |
|
ret = ext4_read_inline_page(inode, page); |
|
if (ret < 0) |
|
goto out; |
|
} |
|
|
|
ret = ext4_destroy_inline_data_nolock(handle, inode); |
|
if (ret) |
|
goto out; |
|
|
|
if (ext4_should_dioread_nolock(inode)) { |
|
ret = __block_write_begin(page, from, to, |
|
ext4_get_block_unwritten); |
|
} else |
|
ret = __block_write_begin(page, from, to, ext4_get_block); |
|
|
|
if (!ret && ext4_should_journal_data(inode)) { |
|
ret = ext4_walk_page_buffers(handle, page_buffers(page), |
|
from, to, NULL, |
|
do_journal_get_write_access); |
|
} |
|
|
|
if (ret) { |
|
unlock_page(page); |
|
put_page(page); |
|
page = NULL; |
|
ext4_orphan_add(handle, inode); |
|
ext4_write_unlock_xattr(inode, &no_expand); |
|
sem_held = 0; |
|
ext4_journal_stop(handle); |
|
handle = NULL; |
|
ext4_truncate_failed_write(inode); |
|
/* |
|
* If truncate failed early the inode might |
|
* still be on the orphan list; we need to |
|
* make sure the inode is removed from the |
|
* orphan list in that case. |
|
*/ |
|
if (inode->i_nlink) |
|
ext4_orphan_del(NULL, inode); |
|
} |
|
|
|
if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) |
|
goto retry; |
|
|
|
if (page) |
|
block_commit_write(page, from, to); |
|
out: |
|
if (page) { |
|
unlock_page(page); |
|
put_page(page); |
|
} |
|
if (sem_held) |
|
ext4_write_unlock_xattr(inode, &no_expand); |
|
if (handle) |
|
ext4_journal_stop(handle); |
|
brelse(iloc.bh); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Try to write data in the inode. |
|
* If the inode has inline data, check whether the new write can be |
|
* in the inode also. If not, create the page the handle, move the data |
|
* to the page make it update and let the later codes create extent for it. |
|
*/ |
|
int ext4_try_to_write_inline_data(struct address_space *mapping, |
|
struct inode *inode, |
|
loff_t pos, unsigned len, |
|
unsigned flags, |
|
struct page **pagep) |
|
{ |
|
int ret; |
|
handle_t *handle; |
|
struct page *page; |
|
struct ext4_iloc iloc; |
|
|
|
if (pos + len > ext4_get_max_inline_size(inode)) |
|
goto convert; |
|
|
|
ret = ext4_get_inode_loc(inode, &iloc); |
|
if (ret) |
|
return ret; |
|
|
|
/* |
|
* The possible write could happen in the inode, |
|
* so try to reserve the space in inode first. |
|
*/ |
|
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
|
if (IS_ERR(handle)) { |
|
ret = PTR_ERR(handle); |
|
handle = NULL; |
|
goto out; |
|
} |
|
|
|
ret = ext4_prepare_inline_data(handle, inode, pos + len); |
|
if (ret && ret != -ENOSPC) |
|
goto out; |
|
|
|
/* We don't have space in inline inode, so convert it to extent. */ |
|
if (ret == -ENOSPC) { |
|
ext4_journal_stop(handle); |
|
brelse(iloc.bh); |
|
goto convert; |
|
} |
|
|
|
ret = ext4_journal_get_write_access(handle, iloc.bh); |
|
if (ret) |
|
goto out; |
|
|
|
flags |= AOP_FLAG_NOFS; |
|
|
|
page = grab_cache_page_write_begin(mapping, 0, flags); |
|
if (!page) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
*pagep = page; |
|
down_read(&EXT4_I(inode)->xattr_sem); |
|
if (!ext4_has_inline_data(inode)) { |
|
ret = 0; |
|
unlock_page(page); |
|
put_page(page); |
|
goto out_up_read; |
|
} |
|
|
|
if (!PageUptodate(page)) { |
|
ret = ext4_read_inline_page(inode, page); |
|
if (ret < 0) { |
|
unlock_page(page); |
|
put_page(page); |
|
goto out_up_read; |
|
} |
|
} |
|
|
|
ret = 1; |
|
handle = NULL; |
|
out_up_read: |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
out: |
|
if (handle && (ret != 1)) |
|
ext4_journal_stop(handle); |
|
brelse(iloc.bh); |
|
return ret; |
|
convert: |
|
return ext4_convert_inline_data_to_extent(mapping, |
|
inode, flags); |
|
} |
|
|
|
int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len, |
|
unsigned copied, struct page *page) |
|
{ |
|
int ret, no_expand; |
|
void *kaddr; |
|
struct ext4_iloc iloc; |
|
|
|
if (unlikely(copied < len)) { |
|
if (!PageUptodate(page)) { |
|
copied = 0; |
|
goto out; |
|
} |
|
} |
|
|
|
ret = ext4_get_inode_loc(inode, &iloc); |
|
if (ret) { |
|
ext4_std_error(inode->i_sb, ret); |
|
copied = 0; |
|
goto out; |
|
} |
|
|
|
ext4_write_lock_xattr(inode, &no_expand); |
|
BUG_ON(!ext4_has_inline_data(inode)); |
|
|
|
kaddr = kmap_atomic(page); |
|
ext4_write_inline_data(inode, &iloc, kaddr, pos, len); |
|
kunmap_atomic(kaddr); |
|
SetPageUptodate(page); |
|
/* clear page dirty so that writepages wouldn't work for us. */ |
|
ClearPageDirty(page); |
|
|
|
ext4_write_unlock_xattr(inode, &no_expand); |
|
brelse(iloc.bh); |
|
mark_inode_dirty(inode); |
|
out: |
|
return copied; |
|
} |
|
|
|
struct buffer_head * |
|
ext4_journalled_write_inline_data(struct inode *inode, |
|
unsigned len, |
|
struct page *page) |
|
{ |
|
int ret, no_expand; |
|
void *kaddr; |
|
struct ext4_iloc iloc; |
|
|
|
ret = ext4_get_inode_loc(inode, &iloc); |
|
if (ret) { |
|
ext4_std_error(inode->i_sb, ret); |
|
return NULL; |
|
} |
|
|
|
ext4_write_lock_xattr(inode, &no_expand); |
|
kaddr = kmap_atomic(page); |
|
ext4_write_inline_data(inode, &iloc, kaddr, 0, len); |
|
kunmap_atomic(kaddr); |
|
ext4_write_unlock_xattr(inode, &no_expand); |
|
|
|
return iloc.bh; |
|
} |
|
|
|
/* |
|
* Try to make the page cache and handle ready for the inline data case. |
|
* We can call this function in 2 cases: |
|
* 1. The inode is created and the first write exceeds inline size. We can |
|
* clear the inode state safely. |
|
* 2. The inode has inline data, then we need to read the data, make it |
|
* update and dirty so that ext4_da_writepages can handle it. We don't |
|
* need to start the journal since the file's metadata isn't changed now. |
|
*/ |
|
static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping, |
|
struct inode *inode, |
|
unsigned flags, |
|
void **fsdata) |
|
{ |
|
int ret = 0, inline_size; |
|
struct page *page; |
|
|
|
page = grab_cache_page_write_begin(mapping, 0, flags); |
|
if (!page) |
|
return -ENOMEM; |
|
|
|
down_read(&EXT4_I(inode)->xattr_sem); |
|
if (!ext4_has_inline_data(inode)) { |
|
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
|
goto out; |
|
} |
|
|
|
inline_size = ext4_get_inline_size(inode); |
|
|
|
if (!PageUptodate(page)) { |
|
ret = ext4_read_inline_page(inode, page); |
|
if (ret < 0) |
|
goto out; |
|
} |
|
|
|
ret = __block_write_begin(page, 0, inline_size, |
|
ext4_da_get_block_prep); |
|
if (ret) { |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
unlock_page(page); |
|
put_page(page); |
|
ext4_truncate_failed_write(inode); |
|
return ret; |
|
} |
|
|
|
SetPageDirty(page); |
|
SetPageUptodate(page); |
|
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
|
*fsdata = (void *)CONVERT_INLINE_DATA; |
|
|
|
out: |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
if (page) { |
|
unlock_page(page); |
|
put_page(page); |
|
} |
|
return ret; |
|
} |
|
|
|
/* |
|
* Prepare the write for the inline data. |
|
* If the data can be written into the inode, we just read |
|
* the page and make it uptodate, and start the journal. |
|
* Otherwise read the page, makes it dirty so that it can be |
|
* handle in writepages(the i_disksize update is left to the |
|
* normal ext4_da_write_end). |
|
*/ |
|
int ext4_da_write_inline_data_begin(struct address_space *mapping, |
|
struct inode *inode, |
|
loff_t pos, unsigned len, |
|
unsigned flags, |
|
struct page **pagep, |
|
void **fsdata) |
|
{ |
|
int ret, inline_size; |
|
handle_t *handle; |
|
struct page *page; |
|
struct ext4_iloc iloc; |
|
int retries = 0; |
|
|
|
ret = ext4_get_inode_loc(inode, &iloc); |
|
if (ret) |
|
return ret; |
|
|
|
retry_journal: |
|
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); |
|
if (IS_ERR(handle)) { |
|
ret = PTR_ERR(handle); |
|
goto out; |
|
} |
|
|
|
inline_size = ext4_get_max_inline_size(inode); |
|
|
|
ret = -ENOSPC; |
|
if (inline_size >= pos + len) { |
|
ret = ext4_prepare_inline_data(handle, inode, pos + len); |
|
if (ret && ret != -ENOSPC) |
|
goto out_journal; |
|
} |
|
|
|
/* |
|
* We cannot recurse into the filesystem as the transaction |
|
* is already started. |
|
*/ |
|
flags |= AOP_FLAG_NOFS; |
|
|
|
if (ret == -ENOSPC) { |
|
ext4_journal_stop(handle); |
|
ret = ext4_da_convert_inline_data_to_extent(mapping, |
|
inode, |
|
flags, |
|
fsdata); |
|
if (ret == -ENOSPC && |
|
ext4_should_retry_alloc(inode->i_sb, &retries)) |
|
goto retry_journal; |
|
goto out; |
|
} |
|
|
|
page = grab_cache_page_write_begin(mapping, 0, flags); |
|
if (!page) { |
|
ret = -ENOMEM; |
|
goto out_journal; |
|
} |
|
|
|
down_read(&EXT4_I(inode)->xattr_sem); |
|
if (!ext4_has_inline_data(inode)) { |
|
ret = 0; |
|
goto out_release_page; |
|
} |
|
|
|
if (!PageUptodate(page)) { |
|
ret = ext4_read_inline_page(inode, page); |
|
if (ret < 0) |
|
goto out_release_page; |
|
} |
|
ret = ext4_journal_get_write_access(handle, iloc.bh); |
|
if (ret) |
|
goto out_release_page; |
|
|
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
*pagep = page; |
|
brelse(iloc.bh); |
|
return 1; |
|
out_release_page: |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
unlock_page(page); |
|
put_page(page); |
|
out_journal: |
|
ext4_journal_stop(handle); |
|
out: |
|
brelse(iloc.bh); |
|
return ret; |
|
} |
|
|
|
int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos, |
|
unsigned len, unsigned copied, |
|
struct page *page) |
|
{ |
|
int ret; |
|
|
|
ret = ext4_write_inline_data_end(inode, pos, len, copied, page); |
|
if (ret < 0) { |
|
unlock_page(page); |
|
put_page(page); |
|
return ret; |
|
} |
|
copied = ret; |
|
|
|
/* |
|
* No need to use i_size_read() here, the i_size |
|
* cannot change under us because we hold i_mutex. |
|
* |
|
* But it's important to update i_size while still holding page lock: |
|
* page writeout could otherwise come in and zero beyond i_size. |
|
*/ |
|
if (pos+copied > inode->i_size) |
|
i_size_write(inode, pos+copied); |
|
unlock_page(page); |
|
put_page(page); |
|
|
|
/* |
|
* Don't mark the inode dirty under page lock. First, it unnecessarily |
|
* makes the holding time of page lock longer. Second, it forces lock |
|
* ordering of page lock and transaction start for journaling |
|
* filesystems. |
|
*/ |
|
mark_inode_dirty(inode); |
|
|
|
return copied; |
|
} |
|
|
|
#ifdef INLINE_DIR_DEBUG |
|
void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh, |
|
void *inline_start, int inline_size) |
|
{ |
|
int offset; |
|
unsigned short de_len; |
|
struct ext4_dir_entry_2 *de = inline_start; |
|
void *dlimit = inline_start + inline_size; |
|
|
|
trace_printk("inode %lu\n", dir->i_ino); |
|
offset = 0; |
|
while ((void *)de < dlimit) { |
|
de_len = ext4_rec_len_from_disk(de->rec_len, inline_size); |
|
trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n", |
|
offset, de_len, de->name_len, de->name, |
|
de->name_len, le32_to_cpu(de->inode)); |
|
if (ext4_check_dir_entry(dir, NULL, de, bh, |
|
inline_start, inline_size, offset)) |
|
BUG(); |
|
|
|
offset += de_len; |
|
de = (struct ext4_dir_entry_2 *) ((char *) de + de_len); |
|
} |
|
} |
|
#else |
|
#define ext4_show_inline_dir(dir, bh, inline_start, inline_size) |
|
#endif |
|
|
|
/* |
|
* Add a new entry into a inline dir. |
|
* It will return -ENOSPC if no space is available, and -EIO |
|
* and -EEXIST if directory entry already exists. |
|
*/ |
|
static int ext4_add_dirent_to_inline(handle_t *handle, |
|
struct ext4_filename *fname, |
|
struct inode *dir, |
|
struct inode *inode, |
|
struct ext4_iloc *iloc, |
|
void *inline_start, int inline_size) |
|
{ |
|
int err; |
|
struct ext4_dir_entry_2 *de; |
|
|
|
err = ext4_find_dest_de(dir, inode, iloc->bh, inline_start, |
|
inline_size, fname, &de); |
|
if (err) |
|
return err; |
|
|
|
BUFFER_TRACE(iloc->bh, "get_write_access"); |
|
err = ext4_journal_get_write_access(handle, iloc->bh); |
|
if (err) |
|
return err; |
|
ext4_insert_dentry(dir, inode, de, inline_size, fname); |
|
|
|
ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size); |
|
|
|
/* |
|
* XXX shouldn't update any times until successful |
|
* completion of syscall, but too many callers depend |
|
* on this. |
|
* |
|
* XXX similarly, too many callers depend on |
|
* ext4_new_inode() setting the times, but error |
|
* recovery deletes the inode, so the worst that can |
|
* happen is that the times are slightly out of date |
|
* and/or different from the directory change time. |
|
*/ |
|
dir->i_mtime = dir->i_ctime = current_time(dir); |
|
ext4_update_dx_flag(dir); |
|
inode_inc_iversion(dir); |
|
return 1; |
|
} |
|
|
|
static void *ext4_get_inline_xattr_pos(struct inode *inode, |
|
struct ext4_iloc *iloc) |
|
{ |
|
struct ext4_xattr_entry *entry; |
|
struct ext4_xattr_ibody_header *header; |
|
|
|
BUG_ON(!EXT4_I(inode)->i_inline_off); |
|
|
|
header = IHDR(inode, ext4_raw_inode(iloc)); |
|
entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) + |
|
EXT4_I(inode)->i_inline_off); |
|
|
|
return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs); |
|
} |
|
|
|
/* Set the final de to cover the whole block. */ |
|
static void ext4_update_final_de(void *de_buf, int old_size, int new_size) |
|
{ |
|
struct ext4_dir_entry_2 *de, *prev_de; |
|
void *limit; |
|
int de_len; |
|
|
|
de = (struct ext4_dir_entry_2 *)de_buf; |
|
if (old_size) { |
|
limit = de_buf + old_size; |
|
do { |
|
prev_de = de; |
|
de_len = ext4_rec_len_from_disk(de->rec_len, old_size); |
|
de_buf += de_len; |
|
de = (struct ext4_dir_entry_2 *)de_buf; |
|
} while (de_buf < limit); |
|
|
|
prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size - |
|
old_size, new_size); |
|
} else { |
|
/* this is just created, so create an empty entry. */ |
|
de->inode = 0; |
|
de->rec_len = ext4_rec_len_to_disk(new_size, new_size); |
|
} |
|
} |
|
|
|
static int ext4_update_inline_dir(handle_t *handle, struct inode *dir, |
|
struct ext4_iloc *iloc) |
|
{ |
|
int ret; |
|
int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE; |
|
int new_size = get_max_inline_xattr_value_size(dir, iloc); |
|
|
|
if (new_size - old_size <= ext4_dir_rec_len(1, NULL)) |
|
return -ENOSPC; |
|
|
|
ret = ext4_update_inline_data(handle, dir, |
|
new_size + EXT4_MIN_INLINE_DATA_SIZE); |
|
if (ret) |
|
return ret; |
|
|
|
ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size, |
|
EXT4_I(dir)->i_inline_size - |
|
EXT4_MIN_INLINE_DATA_SIZE); |
|
dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size; |
|
return 0; |
|
} |
|
|
|
static void ext4_restore_inline_data(handle_t *handle, struct inode *inode, |
|
struct ext4_iloc *iloc, |
|
void *buf, int inline_size) |
|
{ |
|
ext4_create_inline_data(handle, inode, inline_size); |
|
ext4_write_inline_data(inode, iloc, buf, 0, inline_size); |
|
ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
|
} |
|
|
|
static int ext4_finish_convert_inline_dir(handle_t *handle, |
|
struct inode *inode, |
|
struct buffer_head *dir_block, |
|
void *buf, |
|
int inline_size) |
|
{ |
|
int err, csum_size = 0, header_size = 0; |
|
struct ext4_dir_entry_2 *de; |
|
void *target = dir_block->b_data; |
|
|
|
/* |
|
* First create "." and ".." and then copy the dir information |
|
* back to the block. |
|
*/ |
|
de = (struct ext4_dir_entry_2 *)target; |
|
de = ext4_init_dot_dotdot(inode, de, |
|
inode->i_sb->s_blocksize, csum_size, |
|
le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1); |
|
header_size = (void *)de - target; |
|
|
|
memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE, |
|
inline_size - EXT4_INLINE_DOTDOT_SIZE); |
|
|
|
if (ext4_has_metadata_csum(inode->i_sb)) |
|
csum_size = sizeof(struct ext4_dir_entry_tail); |
|
|
|
inode->i_size = inode->i_sb->s_blocksize; |
|
i_size_write(inode, inode->i_sb->s_blocksize); |
|
EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize; |
|
ext4_update_final_de(dir_block->b_data, |
|
inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size, |
|
inode->i_sb->s_blocksize - csum_size); |
|
|
|
if (csum_size) |
|
ext4_initialize_dirent_tail(dir_block, |
|
inode->i_sb->s_blocksize); |
|
set_buffer_uptodate(dir_block); |
|
err = ext4_handle_dirty_dirblock(handle, inode, dir_block); |
|
if (err) |
|
return err; |
|
set_buffer_verified(dir_block); |
|
return ext4_mark_inode_dirty(handle, inode); |
|
} |
|
|
|
static int ext4_convert_inline_data_nolock(handle_t *handle, |
|
struct inode *inode, |
|
struct ext4_iloc *iloc) |
|
{ |
|
int error; |
|
void *buf = NULL; |
|
struct buffer_head *data_bh = NULL; |
|
struct ext4_map_blocks map; |
|
int inline_size; |
|
|
|
inline_size = ext4_get_inline_size(inode); |
|
buf = kmalloc(inline_size, GFP_NOFS); |
|
if (!buf) { |
|
error = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
error = ext4_read_inline_data(inode, buf, inline_size, iloc); |
|
if (error < 0) |
|
goto out; |
|
|
|
/* |
|
* Make sure the inline directory entries pass checks before we try to |
|
* convert them, so that we avoid touching stuff that needs fsck. |
|
*/ |
|
if (S_ISDIR(inode->i_mode)) { |
|
error = ext4_check_all_de(inode, iloc->bh, |
|
buf + EXT4_INLINE_DOTDOT_SIZE, |
|
inline_size - EXT4_INLINE_DOTDOT_SIZE); |
|
if (error) |
|
goto out; |
|
} |
|
|
|
error = ext4_destroy_inline_data_nolock(handle, inode); |
|
if (error) |
|
goto out; |
|
|
|
map.m_lblk = 0; |
|
map.m_len = 1; |
|
map.m_flags = 0; |
|
error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE); |
|
if (error < 0) |
|
goto out_restore; |
|
if (!(map.m_flags & EXT4_MAP_MAPPED)) { |
|
error = -EIO; |
|
goto out_restore; |
|
} |
|
|
|
data_bh = sb_getblk(inode->i_sb, map.m_pblk); |
|
if (!data_bh) { |
|
error = -ENOMEM; |
|
goto out_restore; |
|
} |
|
|
|
lock_buffer(data_bh); |
|
error = ext4_journal_get_create_access(handle, data_bh); |
|
if (error) { |
|
unlock_buffer(data_bh); |
|
error = -EIO; |
|
goto out_restore; |
|
} |
|
memset(data_bh->b_data, 0, inode->i_sb->s_blocksize); |
|
|
|
if (!S_ISDIR(inode->i_mode)) { |
|
memcpy(data_bh->b_data, buf, inline_size); |
|
set_buffer_uptodate(data_bh); |
|
error = ext4_handle_dirty_metadata(handle, |
|
inode, data_bh); |
|
} else { |
|
error = ext4_finish_convert_inline_dir(handle, inode, data_bh, |
|
buf, inline_size); |
|
} |
|
|
|
unlock_buffer(data_bh); |
|
out_restore: |
|
if (error) |
|
ext4_restore_inline_data(handle, inode, iloc, buf, inline_size); |
|
|
|
out: |
|
brelse(data_bh); |
|
kfree(buf); |
|
return error; |
|
} |
|
|
|
/* |
|
* Try to add the new entry to the inline data. |
|
* If succeeds, return 0. If not, extended the inline dir and copied data to |
|
* the new created block. |
|
*/ |
|
int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname, |
|
struct inode *dir, struct inode *inode) |
|
{ |
|
int ret, ret2, inline_size, no_expand; |
|
void *inline_start; |
|
struct ext4_iloc iloc; |
|
|
|
ret = ext4_get_inode_loc(dir, &iloc); |
|
if (ret) |
|
return ret; |
|
|
|
ext4_write_lock_xattr(dir, &no_expand); |
|
if (!ext4_has_inline_data(dir)) |
|
goto out; |
|
|
|
inline_start = (void *)ext4_raw_inode(&iloc)->i_block + |
|
EXT4_INLINE_DOTDOT_SIZE; |
|
inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; |
|
|
|
ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc, |
|
inline_start, inline_size); |
|
if (ret != -ENOSPC) |
|
goto out; |
|
|
|
/* check whether it can be inserted to inline xattr space. */ |
|
inline_size = EXT4_I(dir)->i_inline_size - |
|
EXT4_MIN_INLINE_DATA_SIZE; |
|
if (!inline_size) { |
|
/* Try to use the xattr space.*/ |
|
ret = ext4_update_inline_dir(handle, dir, &iloc); |
|
if (ret && ret != -ENOSPC) |
|
goto out; |
|
|
|
inline_size = EXT4_I(dir)->i_inline_size - |
|
EXT4_MIN_INLINE_DATA_SIZE; |
|
} |
|
|
|
if (inline_size) { |
|
inline_start = ext4_get_inline_xattr_pos(dir, &iloc); |
|
|
|
ret = ext4_add_dirent_to_inline(handle, fname, dir, |
|
inode, &iloc, inline_start, |
|
inline_size); |
|
|
|
if (ret != -ENOSPC) |
|
goto out; |
|
} |
|
|
|
/* |
|
* The inline space is filled up, so create a new block for it. |
|
* As the extent tree will be created, we have to save the inline |
|
* dir first. |
|
*/ |
|
ret = ext4_convert_inline_data_nolock(handle, dir, &iloc); |
|
|
|
out: |
|
ext4_write_unlock_xattr(dir, &no_expand); |
|
ret2 = ext4_mark_inode_dirty(handle, dir); |
|
if (unlikely(ret2 && !ret)) |
|
ret = ret2; |
|
brelse(iloc.bh); |
|
return ret; |
|
} |
|
|
|
/* |
|
* This function fills a red-black tree with information from an |
|
* inlined dir. It returns the number directory entries loaded |
|
* into the tree. If there is an error it is returned in err. |
|
*/ |
|
int ext4_inlinedir_to_tree(struct file *dir_file, |
|
struct inode *dir, ext4_lblk_t block, |
|
struct dx_hash_info *hinfo, |
|
__u32 start_hash, __u32 start_minor_hash, |
|
int *has_inline_data) |
|
{ |
|
int err = 0, count = 0; |
|
unsigned int parent_ino; |
|
int pos; |
|
struct ext4_dir_entry_2 *de; |
|
struct inode *inode = file_inode(dir_file); |
|
int ret, inline_size = 0; |
|
struct ext4_iloc iloc; |
|
void *dir_buf = NULL; |
|
struct ext4_dir_entry_2 fake; |
|
struct fscrypt_str tmp_str; |
|
|
|
ret = ext4_get_inode_loc(inode, &iloc); |
|
if (ret) |
|
return ret; |
|
|
|
down_read(&EXT4_I(inode)->xattr_sem); |
|
if (!ext4_has_inline_data(inode)) { |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
*has_inline_data = 0; |
|
goto out; |
|
} |
|
|
|
inline_size = ext4_get_inline_size(inode); |
|
dir_buf = kmalloc(inline_size, GFP_NOFS); |
|
if (!dir_buf) { |
|
ret = -ENOMEM; |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
goto out; |
|
} |
|
|
|
ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
if (ret < 0) |
|
goto out; |
|
|
|
pos = 0; |
|
parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); |
|
while (pos < inline_size) { |
|
/* |
|
* As inlined dir doesn't store any information about '.' and |
|
* only the inode number of '..' is stored, we have to handle |
|
* them differently. |
|
*/ |
|
if (pos == 0) { |
|
fake.inode = cpu_to_le32(inode->i_ino); |
|
fake.name_len = 1; |
|
strcpy(fake.name, "."); |
|
fake.rec_len = ext4_rec_len_to_disk( |
|
ext4_dir_rec_len(fake.name_len, NULL), |
|
inline_size); |
|
ext4_set_de_type(inode->i_sb, &fake, S_IFDIR); |
|
de = &fake; |
|
pos = EXT4_INLINE_DOTDOT_OFFSET; |
|
} else if (pos == EXT4_INLINE_DOTDOT_OFFSET) { |
|
fake.inode = cpu_to_le32(parent_ino); |
|
fake.name_len = 2; |
|
strcpy(fake.name, ".."); |
|
fake.rec_len = ext4_rec_len_to_disk( |
|
ext4_dir_rec_len(fake.name_len, NULL), |
|
inline_size); |
|
ext4_set_de_type(inode->i_sb, &fake, S_IFDIR); |
|
de = &fake; |
|
pos = EXT4_INLINE_DOTDOT_SIZE; |
|
} else { |
|
de = (struct ext4_dir_entry_2 *)(dir_buf + pos); |
|
pos += ext4_rec_len_from_disk(de->rec_len, inline_size); |
|
if (ext4_check_dir_entry(inode, dir_file, de, |
|
iloc.bh, dir_buf, |
|
inline_size, pos)) { |
|
ret = count; |
|
goto out; |
|
} |
|
} |
|
|
|
if (ext4_hash_in_dirent(dir)) { |
|
hinfo->hash = EXT4_DIRENT_HASH(de); |
|
hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de); |
|
} else { |
|
ext4fs_dirhash(dir, de->name, de->name_len, hinfo); |
|
} |
|
if ((hinfo->hash < start_hash) || |
|
((hinfo->hash == start_hash) && |
|
(hinfo->minor_hash < start_minor_hash))) |
|
continue; |
|
if (de->inode == 0) |
|
continue; |
|
tmp_str.name = de->name; |
|
tmp_str.len = de->name_len; |
|
err = ext4_htree_store_dirent(dir_file, hinfo->hash, |
|
hinfo->minor_hash, de, &tmp_str); |
|
if (err) { |
|
ret = err; |
|
goto out; |
|
} |
|
count++; |
|
} |
|
ret = count; |
|
out: |
|
kfree(dir_buf); |
|
brelse(iloc.bh); |
|
return ret; |
|
} |
|
|
|
/* |
|
* So this function is called when the volume is mkfsed with |
|
* dir_index disabled. In order to keep f_pos persistent |
|
* after we convert from an inlined dir to a blocked based, |
|
* we just pretend that we are a normal dir and return the |
|
* offset as if '.' and '..' really take place. |
|
* |
|
*/ |
|
int ext4_read_inline_dir(struct file *file, |
|
struct dir_context *ctx, |
|
int *has_inline_data) |
|
{ |
|
unsigned int offset, parent_ino; |
|
int i; |
|
struct ext4_dir_entry_2 *de; |
|
struct super_block *sb; |
|
struct inode *inode = file_inode(file); |
|
int ret, inline_size = 0; |
|
struct ext4_iloc iloc; |
|
void *dir_buf = NULL; |
|
int dotdot_offset, dotdot_size, extra_offset, extra_size; |
|
|
|
ret = ext4_get_inode_loc(inode, &iloc); |
|
if (ret) |
|
return ret; |
|
|
|
down_read(&EXT4_I(inode)->xattr_sem); |
|
if (!ext4_has_inline_data(inode)) { |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
*has_inline_data = 0; |
|
goto out; |
|
} |
|
|
|
inline_size = ext4_get_inline_size(inode); |
|
dir_buf = kmalloc(inline_size, GFP_NOFS); |
|
if (!dir_buf) { |
|
ret = -ENOMEM; |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
goto out; |
|
} |
|
|
|
ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc); |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
if (ret < 0) |
|
goto out; |
|
|
|
ret = 0; |
|
sb = inode->i_sb; |
|
parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode); |
|
offset = ctx->pos; |
|
|
|
/* |
|
* dotdot_offset and dotdot_size is the real offset and |
|
* size for ".." and "." if the dir is block based while |
|
* the real size for them are only EXT4_INLINE_DOTDOT_SIZE. |
|
* So we will use extra_offset and extra_size to indicate them |
|
* during the inline dir iteration. |
|
*/ |
|
dotdot_offset = ext4_dir_rec_len(1, NULL); |
|
dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL); |
|
extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE; |
|
extra_size = extra_offset + inline_size; |
|
|
|
/* |
|
* If the version has changed since the last call to |
|
* readdir(2), then we might be pointing to an invalid |
|
* dirent right now. Scan from the start of the inline |
|
* dir to make sure. |
|
*/ |
|
if (!inode_eq_iversion(inode, file->f_version)) { |
|
for (i = 0; i < extra_size && i < offset;) { |
|
/* |
|
* "." is with offset 0 and |
|
* ".." is dotdot_offset. |
|
*/ |
|
if (!i) { |
|
i = dotdot_offset; |
|
continue; |
|
} else if (i == dotdot_offset) { |
|
i = dotdot_size; |
|
continue; |
|
} |
|
/* for other entry, the real offset in |
|
* the buf has to be tuned accordingly. |
|
*/ |
|
de = (struct ext4_dir_entry_2 *) |
|
(dir_buf + i - extra_offset); |
|
/* It's too expensive to do a full |
|
* dirent test each time round this |
|
* loop, but we do have to test at |
|
* least that it is non-zero. A |
|
* failure will be detected in the |
|
* dirent test below. */ |
|
if (ext4_rec_len_from_disk(de->rec_len, extra_size) |
|
< ext4_dir_rec_len(1, NULL)) |
|
break; |
|
i += ext4_rec_len_from_disk(de->rec_len, |
|
extra_size); |
|
} |
|
offset = i; |
|
ctx->pos = offset; |
|
file->f_version = inode_query_iversion(inode); |
|
} |
|
|
|
while (ctx->pos < extra_size) { |
|
if (ctx->pos == 0) { |
|
if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR)) |
|
goto out; |
|
ctx->pos = dotdot_offset; |
|
continue; |
|
} |
|
|
|
if (ctx->pos == dotdot_offset) { |
|
if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR)) |
|
goto out; |
|
ctx->pos = dotdot_size; |
|
continue; |
|
} |
|
|
|
de = (struct ext4_dir_entry_2 *) |
|
(dir_buf + ctx->pos - extra_offset); |
|
if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf, |
|
extra_size, ctx->pos)) |
|
goto out; |
|
if (le32_to_cpu(de->inode)) { |
|
if (!dir_emit(ctx, de->name, de->name_len, |
|
le32_to_cpu(de->inode), |
|
get_dtype(sb, de->file_type))) |
|
goto out; |
|
} |
|
ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size); |
|
} |
|
out: |
|
kfree(dir_buf); |
|
brelse(iloc.bh); |
|
return ret; |
|
} |
|
|
|
struct buffer_head *ext4_get_first_inline_block(struct inode *inode, |
|
struct ext4_dir_entry_2 **parent_de, |
|
int *retval) |
|
{ |
|
struct ext4_iloc iloc; |
|
|
|
*retval = ext4_get_inode_loc(inode, &iloc); |
|
if (*retval) |
|
return NULL; |
|
|
|
*parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; |
|
|
|
return iloc.bh; |
|
} |
|
|
|
/* |
|
* Try to create the inline data for the new dir. |
|
* If it succeeds, return 0, otherwise return the error. |
|
* In case of ENOSPC, the caller should create the normal disk layout dir. |
|
*/ |
|
int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent, |
|
struct inode *inode) |
|
{ |
|
int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE; |
|
struct ext4_iloc iloc; |
|
struct ext4_dir_entry_2 *de; |
|
|
|
ret = ext4_get_inode_loc(inode, &iloc); |
|
if (ret) |
|
return ret; |
|
|
|
ret = ext4_prepare_inline_data(handle, inode, inline_size); |
|
if (ret) |
|
goto out; |
|
|
|
/* |
|
* For inline dir, we only save the inode information for the ".." |
|
* and create a fake dentry to cover the left space. |
|
*/ |
|
de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; |
|
de->inode = cpu_to_le32(parent->i_ino); |
|
de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE); |
|
de->inode = 0; |
|
de->rec_len = ext4_rec_len_to_disk( |
|
inline_size - EXT4_INLINE_DOTDOT_SIZE, |
|
inline_size); |
|
set_nlink(inode, 2); |
|
inode->i_size = EXT4_I(inode)->i_disksize = inline_size; |
|
out: |
|
brelse(iloc.bh); |
|
return ret; |
|
} |
|
|
|
struct buffer_head *ext4_find_inline_entry(struct inode *dir, |
|
struct ext4_filename *fname, |
|
struct ext4_dir_entry_2 **res_dir, |
|
int *has_inline_data) |
|
{ |
|
int ret; |
|
struct ext4_iloc iloc; |
|
void *inline_start; |
|
int inline_size; |
|
|
|
if (ext4_get_inode_loc(dir, &iloc)) |
|
return NULL; |
|
|
|
down_read(&EXT4_I(dir)->xattr_sem); |
|
if (!ext4_has_inline_data(dir)) { |
|
*has_inline_data = 0; |
|
goto out; |
|
} |
|
|
|
inline_start = (void *)ext4_raw_inode(&iloc)->i_block + |
|
EXT4_INLINE_DOTDOT_SIZE; |
|
inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE; |
|
ret = ext4_search_dir(iloc.bh, inline_start, inline_size, |
|
dir, fname, 0, res_dir); |
|
if (ret == 1) |
|
goto out_find; |
|
if (ret < 0) |
|
goto out; |
|
|
|
if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE) |
|
goto out; |
|
|
|
inline_start = ext4_get_inline_xattr_pos(dir, &iloc); |
|
inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE; |
|
|
|
ret = ext4_search_dir(iloc.bh, inline_start, inline_size, |
|
dir, fname, 0, res_dir); |
|
if (ret == 1) |
|
goto out_find; |
|
|
|
out: |
|
brelse(iloc.bh); |
|
iloc.bh = NULL; |
|
out_find: |
|
up_read(&EXT4_I(dir)->xattr_sem); |
|
return iloc.bh; |
|
} |
|
|
|
int ext4_delete_inline_entry(handle_t *handle, |
|
struct inode *dir, |
|
struct ext4_dir_entry_2 *de_del, |
|
struct buffer_head *bh, |
|
int *has_inline_data) |
|
{ |
|
int err, inline_size, no_expand; |
|
struct ext4_iloc iloc; |
|
void *inline_start; |
|
|
|
err = ext4_get_inode_loc(dir, &iloc); |
|
if (err) |
|
return err; |
|
|
|
ext4_write_lock_xattr(dir, &no_expand); |
|
if (!ext4_has_inline_data(dir)) { |
|
*has_inline_data = 0; |
|
goto out; |
|
} |
|
|
|
if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) < |
|
EXT4_MIN_INLINE_DATA_SIZE) { |
|
inline_start = (void *)ext4_raw_inode(&iloc)->i_block + |
|
EXT4_INLINE_DOTDOT_SIZE; |
|
inline_size = EXT4_MIN_INLINE_DATA_SIZE - |
|
EXT4_INLINE_DOTDOT_SIZE; |
|
} else { |
|
inline_start = ext4_get_inline_xattr_pos(dir, &iloc); |
|
inline_size = ext4_get_inline_size(dir) - |
|
EXT4_MIN_INLINE_DATA_SIZE; |
|
} |
|
|
|
BUFFER_TRACE(bh, "get_write_access"); |
|
err = ext4_journal_get_write_access(handle, bh); |
|
if (err) |
|
goto out; |
|
|
|
err = ext4_generic_delete_entry(dir, de_del, bh, |
|
inline_start, inline_size, 0); |
|
if (err) |
|
goto out; |
|
|
|
ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size); |
|
out: |
|
ext4_write_unlock_xattr(dir, &no_expand); |
|
if (likely(err == 0)) |
|
err = ext4_mark_inode_dirty(handle, dir); |
|
brelse(iloc.bh); |
|
if (err != -ENOENT) |
|
ext4_std_error(dir->i_sb, err); |
|
return err; |
|
} |
|
|
|
/* |
|
* Get the inline dentry at offset. |
|
*/ |
|
static inline struct ext4_dir_entry_2 * |
|
ext4_get_inline_entry(struct inode *inode, |
|
struct ext4_iloc *iloc, |
|
unsigned int offset, |
|
void **inline_start, |
|
int *inline_size) |
|
{ |
|
void *inline_pos; |
|
|
|
BUG_ON(offset > ext4_get_inline_size(inode)); |
|
|
|
if (offset < EXT4_MIN_INLINE_DATA_SIZE) { |
|
inline_pos = (void *)ext4_raw_inode(iloc)->i_block; |
|
*inline_size = EXT4_MIN_INLINE_DATA_SIZE; |
|
} else { |
|
inline_pos = ext4_get_inline_xattr_pos(inode, iloc); |
|
offset -= EXT4_MIN_INLINE_DATA_SIZE; |
|
*inline_size = ext4_get_inline_size(inode) - |
|
EXT4_MIN_INLINE_DATA_SIZE; |
|
} |
|
|
|
if (inline_start) |
|
*inline_start = inline_pos; |
|
return (struct ext4_dir_entry_2 *)(inline_pos + offset); |
|
} |
|
|
|
bool empty_inline_dir(struct inode *dir, int *has_inline_data) |
|
{ |
|
int err, inline_size; |
|
struct ext4_iloc iloc; |
|
size_t inline_len; |
|
void *inline_pos; |
|
unsigned int offset; |
|
struct ext4_dir_entry_2 *de; |
|
bool ret = true; |
|
|
|
err = ext4_get_inode_loc(dir, &iloc); |
|
if (err) { |
|
EXT4_ERROR_INODE_ERR(dir, -err, |
|
"error %d getting inode %lu block", |
|
err, dir->i_ino); |
|
return true; |
|
} |
|
|
|
down_read(&EXT4_I(dir)->xattr_sem); |
|
if (!ext4_has_inline_data(dir)) { |
|
*has_inline_data = 0; |
|
goto out; |
|
} |
|
|
|
de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block; |
|
if (!le32_to_cpu(de->inode)) { |
|
ext4_warning(dir->i_sb, |
|
"bad inline directory (dir #%lu) - no `..'", |
|
dir->i_ino); |
|
ret = true; |
|
goto out; |
|
} |
|
|
|
inline_len = ext4_get_inline_size(dir); |
|
offset = EXT4_INLINE_DOTDOT_SIZE; |
|
while (offset < inline_len) { |
|
de = ext4_get_inline_entry(dir, &iloc, offset, |
|
&inline_pos, &inline_size); |
|
if (ext4_check_dir_entry(dir, NULL, de, |
|
iloc.bh, inline_pos, |
|
inline_size, offset)) { |
|
ext4_warning(dir->i_sb, |
|
"bad inline directory (dir #%lu) - " |
|
"inode %u, rec_len %u, name_len %d" |
|
"inline size %d", |
|
dir->i_ino, le32_to_cpu(de->inode), |
|
le16_to_cpu(de->rec_len), de->name_len, |
|
inline_size); |
|
ret = true; |
|
goto out; |
|
} |
|
if (le32_to_cpu(de->inode)) { |
|
ret = false; |
|
goto out; |
|
} |
|
offset += ext4_rec_len_from_disk(de->rec_len, inline_size); |
|
} |
|
|
|
out: |
|
up_read(&EXT4_I(dir)->xattr_sem); |
|
brelse(iloc.bh); |
|
return ret; |
|
} |
|
|
|
int ext4_destroy_inline_data(handle_t *handle, struct inode *inode) |
|
{ |
|
int ret, no_expand; |
|
|
|
ext4_write_lock_xattr(inode, &no_expand); |
|
ret = ext4_destroy_inline_data_nolock(handle, inode); |
|
ext4_write_unlock_xattr(inode, &no_expand); |
|
|
|
return ret; |
|
} |
|
|
|
int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap) |
|
{ |
|
__u64 addr; |
|
int error = -EAGAIN; |
|
struct ext4_iloc iloc; |
|
|
|
down_read(&EXT4_I(inode)->xattr_sem); |
|
if (!ext4_has_inline_data(inode)) |
|
goto out; |
|
|
|
error = ext4_get_inode_loc(inode, &iloc); |
|
if (error) |
|
goto out; |
|
|
|
addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits; |
|
addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data; |
|
addr += offsetof(struct ext4_inode, i_block); |
|
|
|
brelse(iloc.bh); |
|
|
|
iomap->addr = addr; |
|
iomap->offset = 0; |
|
iomap->length = min_t(loff_t, ext4_get_inline_size(inode), |
|
i_size_read(inode)); |
|
iomap->type = IOMAP_INLINE; |
|
iomap->flags = 0; |
|
|
|
out: |
|
up_read(&EXT4_I(inode)->xattr_sem); |
|
return error; |
|
} |
|
|
|
int ext4_inline_data_truncate(struct inode *inode, int *has_inline) |
|
{ |
|
handle_t *handle; |
|
int inline_size, value_len, needed_blocks, no_expand, err = 0; |
|
size_t i_size; |
|
void *value = NULL; |
|
struct ext4_xattr_ibody_find is = { |
|
.s = { .not_found = -ENODATA, }, |
|
}; |
|
struct ext4_xattr_info i = { |
|
.name_index = EXT4_XATTR_INDEX_SYSTEM, |
|
.name = EXT4_XATTR_SYSTEM_DATA, |
|
}; |
|
|
|
|
|
needed_blocks = ext4_writepage_trans_blocks(inode); |
|
handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks); |
|
if (IS_ERR(handle)) |
|
return PTR_ERR(handle); |
|
|
|
ext4_write_lock_xattr(inode, &no_expand); |
|
if (!ext4_has_inline_data(inode)) { |
|
ext4_write_unlock_xattr(inode, &no_expand); |
|
*has_inline = 0; |
|
ext4_journal_stop(handle); |
|
return 0; |
|
} |
|
|
|
if ((err = ext4_orphan_add(handle, inode)) != 0) |
|
goto out; |
|
|
|
if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0) |
|
goto out; |
|
|
|
down_write(&EXT4_I(inode)->i_data_sem); |
|
i_size = inode->i_size; |
|
inline_size = ext4_get_inline_size(inode); |
|
EXT4_I(inode)->i_disksize = i_size; |
|
|
|
if (i_size < inline_size) { |
|
/* Clear the content in the xattr space. */ |
|
if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) { |
|
if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0) |
|
goto out_error; |
|
|
|
BUG_ON(is.s.not_found); |
|
|
|
value_len = le32_to_cpu(is.s.here->e_value_size); |
|
value = kmalloc(value_len, GFP_NOFS); |
|
if (!value) { |
|
err = -ENOMEM; |
|
goto out_error; |
|
} |
|
|
|
err = ext4_xattr_ibody_get(inode, i.name_index, |
|
i.name, value, value_len); |
|
if (err <= 0) |
|
goto out_error; |
|
|
|
i.value = value; |
|
i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ? |
|
i_size - EXT4_MIN_INLINE_DATA_SIZE : 0; |
|
err = ext4_xattr_ibody_set(handle, inode, &i, &is); |
|
if (err) |
|
goto out_error; |
|
} |
|
|
|
/* Clear the content within i_blocks. */ |
|
if (i_size < EXT4_MIN_INLINE_DATA_SIZE) { |
|
void *p = (void *) ext4_raw_inode(&is.iloc)->i_block; |
|
memset(p + i_size, 0, |
|
EXT4_MIN_INLINE_DATA_SIZE - i_size); |
|
} |
|
|
|
EXT4_I(inode)->i_inline_size = i_size < |
|
EXT4_MIN_INLINE_DATA_SIZE ? |
|
EXT4_MIN_INLINE_DATA_SIZE : i_size; |
|
} |
|
|
|
out_error: |
|
up_write(&EXT4_I(inode)->i_data_sem); |
|
out: |
|
brelse(is.iloc.bh); |
|
ext4_write_unlock_xattr(inode, &no_expand); |
|
kfree(value); |
|
if (inode->i_nlink) |
|
ext4_orphan_del(handle, inode); |
|
|
|
if (err == 0) { |
|
inode->i_mtime = inode->i_ctime = current_time(inode); |
|
err = ext4_mark_inode_dirty(handle, inode); |
|
if (IS_SYNC(inode)) |
|
ext4_handle_sync(handle); |
|
} |
|
ext4_journal_stop(handle); |
|
return err; |
|
} |
|
|
|
int ext4_convert_inline_data(struct inode *inode) |
|
{ |
|
int error, needed_blocks, no_expand; |
|
handle_t *handle; |
|
struct ext4_iloc iloc; |
|
|
|
if (!ext4_has_inline_data(inode)) { |
|
ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA); |
|
return 0; |
|
} |
|
|
|
needed_blocks = ext4_writepage_trans_blocks(inode); |
|
|
|
iloc.bh = NULL; |
|
error = ext4_get_inode_loc(inode, &iloc); |
|
if (error) |
|
return error; |
|
|
|
handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks); |
|
if (IS_ERR(handle)) { |
|
error = PTR_ERR(handle); |
|
goto out_free; |
|
} |
|
|
|
ext4_write_lock_xattr(inode, &no_expand); |
|
if (ext4_has_inline_data(inode)) |
|
error = ext4_convert_inline_data_nolock(handle, inode, &iloc); |
|
ext4_write_unlock_xattr(inode, &no_expand); |
|
ext4_journal_stop(handle); |
|
out_free: |
|
brelse(iloc.bh); |
|
return error; |
|
}
|
|
|