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668 lines
17 KiB
668 lines
17 KiB
// SPDX-License-Identifier: LGPL-2.1 |
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/* |
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* Copyright IBM Corporation, 2007 |
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* Author Aneesh Kumar K.V <[email protected]> |
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* |
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*/ |
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|
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#include <linux/slab.h> |
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#include "ext4_jbd2.h" |
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#include "ext4_extents.h" |
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|
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/* |
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* The contiguous blocks details which can be |
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* represented by a single extent |
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*/ |
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struct migrate_struct { |
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ext4_lblk_t first_block, last_block, curr_block; |
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ext4_fsblk_t first_pblock, last_pblock; |
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}; |
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|
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static int finish_range(handle_t *handle, struct inode *inode, |
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struct migrate_struct *lb) |
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|
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{ |
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int retval = 0, needed; |
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struct ext4_extent newext; |
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struct ext4_ext_path *path; |
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if (lb->first_pblock == 0) |
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return 0; |
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|
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/* Add the extent to temp inode*/ |
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newext.ee_block = cpu_to_le32(lb->first_block); |
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newext.ee_len = cpu_to_le16(lb->last_block - lb->first_block + 1); |
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ext4_ext_store_pblock(&newext, lb->first_pblock); |
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/* Locking only for convenience since we are operating on temp inode */ |
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down_write(&EXT4_I(inode)->i_data_sem); |
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path = ext4_find_extent(inode, lb->first_block, NULL, 0); |
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if (IS_ERR(path)) { |
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retval = PTR_ERR(path); |
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path = NULL; |
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goto err_out; |
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} |
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|
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/* |
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* Calculate the credit needed to inserting this extent |
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* Since we are doing this in loop we may accumulate extra |
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* credit. But below we try to not accumulate too much |
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* of them by restarting the journal. |
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*/ |
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needed = ext4_ext_calc_credits_for_single_extent(inode, |
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lb->last_block - lb->first_block + 1, path); |
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|
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retval = ext4_datasem_ensure_credits(handle, inode, needed, needed, 0); |
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if (retval < 0) |
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goto err_out; |
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retval = ext4_ext_insert_extent(handle, inode, &path, &newext, 0); |
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err_out: |
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up_write((&EXT4_I(inode)->i_data_sem)); |
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ext4_ext_drop_refs(path); |
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kfree(path); |
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lb->first_pblock = 0; |
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return retval; |
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} |
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|
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static int update_extent_range(handle_t *handle, struct inode *inode, |
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ext4_fsblk_t pblock, struct migrate_struct *lb) |
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{ |
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int retval; |
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/* |
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* See if we can add on to the existing range (if it exists) |
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*/ |
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if (lb->first_pblock && |
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(lb->last_pblock+1 == pblock) && |
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(lb->last_block+1 == lb->curr_block)) { |
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lb->last_pblock = pblock; |
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lb->last_block = lb->curr_block; |
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lb->curr_block++; |
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return 0; |
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} |
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/* |
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* Start a new range. |
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*/ |
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retval = finish_range(handle, inode, lb); |
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lb->first_pblock = lb->last_pblock = pblock; |
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lb->first_block = lb->last_block = lb->curr_block; |
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lb->curr_block++; |
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return retval; |
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} |
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|
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static int update_ind_extent_range(handle_t *handle, struct inode *inode, |
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ext4_fsblk_t pblock, |
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struct migrate_struct *lb) |
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{ |
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struct buffer_head *bh; |
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__le32 *i_data; |
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int i, retval = 0; |
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
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|
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bh = ext4_sb_bread(inode->i_sb, pblock, 0); |
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if (IS_ERR(bh)) |
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return PTR_ERR(bh); |
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|
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i_data = (__le32 *)bh->b_data; |
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for (i = 0; i < max_entries; i++) { |
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if (i_data[i]) { |
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retval = update_extent_range(handle, inode, |
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le32_to_cpu(i_data[i]), lb); |
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if (retval) |
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break; |
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} else { |
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lb->curr_block++; |
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} |
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} |
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put_bh(bh); |
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return retval; |
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|
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} |
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static int update_dind_extent_range(handle_t *handle, struct inode *inode, |
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ext4_fsblk_t pblock, |
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struct migrate_struct *lb) |
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{ |
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struct buffer_head *bh; |
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__le32 *i_data; |
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int i, retval = 0; |
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
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|
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bh = ext4_sb_bread(inode->i_sb, pblock, 0); |
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if (IS_ERR(bh)) |
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return PTR_ERR(bh); |
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i_data = (__le32 *)bh->b_data; |
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for (i = 0; i < max_entries; i++) { |
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if (i_data[i]) { |
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retval = update_ind_extent_range(handle, inode, |
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le32_to_cpu(i_data[i]), lb); |
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if (retval) |
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break; |
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} else { |
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/* Only update the file block number */ |
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lb->curr_block += max_entries; |
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} |
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} |
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put_bh(bh); |
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return retval; |
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|
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} |
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static int update_tind_extent_range(handle_t *handle, struct inode *inode, |
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ext4_fsblk_t pblock, |
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struct migrate_struct *lb) |
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{ |
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struct buffer_head *bh; |
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__le32 *i_data; |
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int i, retval = 0; |
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
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|
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bh = ext4_sb_bread(inode->i_sb, pblock, 0); |
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if (IS_ERR(bh)) |
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return PTR_ERR(bh); |
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i_data = (__le32 *)bh->b_data; |
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for (i = 0; i < max_entries; i++) { |
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if (i_data[i]) { |
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retval = update_dind_extent_range(handle, inode, |
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le32_to_cpu(i_data[i]), lb); |
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if (retval) |
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break; |
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} else { |
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/* Only update the file block number */ |
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lb->curr_block += max_entries * max_entries; |
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} |
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} |
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put_bh(bh); |
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return retval; |
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|
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} |
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static int free_dind_blocks(handle_t *handle, |
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struct inode *inode, __le32 i_data) |
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{ |
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int i; |
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__le32 *tmp_idata; |
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struct buffer_head *bh; |
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struct super_block *sb = inode->i_sb; |
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
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int err; |
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bh = ext4_sb_bread(sb, le32_to_cpu(i_data), 0); |
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if (IS_ERR(bh)) |
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return PTR_ERR(bh); |
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tmp_idata = (__le32 *)bh->b_data; |
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for (i = 0; i < max_entries; i++) { |
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if (tmp_idata[i]) { |
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err = ext4_journal_ensure_credits(handle, |
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EXT4_RESERVE_TRANS_BLOCKS, |
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ext4_free_metadata_revoke_credits(sb, 1)); |
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if (err < 0) { |
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put_bh(bh); |
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return err; |
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} |
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ext4_free_blocks(handle, inode, NULL, |
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le32_to_cpu(tmp_idata[i]), 1, |
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EXT4_FREE_BLOCKS_METADATA | |
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EXT4_FREE_BLOCKS_FORGET); |
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} |
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} |
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put_bh(bh); |
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err = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS, |
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ext4_free_metadata_revoke_credits(sb, 1)); |
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if (err < 0) |
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return err; |
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ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
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EXT4_FREE_BLOCKS_METADATA | |
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EXT4_FREE_BLOCKS_FORGET); |
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return 0; |
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} |
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static int free_tind_blocks(handle_t *handle, |
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struct inode *inode, __le32 i_data) |
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{ |
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int i, retval = 0; |
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__le32 *tmp_idata; |
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struct buffer_head *bh; |
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unsigned long max_entries = inode->i_sb->s_blocksize >> 2; |
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|
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bh = ext4_sb_bread(inode->i_sb, le32_to_cpu(i_data), 0); |
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if (IS_ERR(bh)) |
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return PTR_ERR(bh); |
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tmp_idata = (__le32 *)bh->b_data; |
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for (i = 0; i < max_entries; i++) { |
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if (tmp_idata[i]) { |
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retval = free_dind_blocks(handle, |
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inode, tmp_idata[i]); |
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if (retval) { |
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put_bh(bh); |
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return retval; |
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} |
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} |
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} |
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put_bh(bh); |
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retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS, |
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ext4_free_metadata_revoke_credits(inode->i_sb, 1)); |
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if (retval < 0) |
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return retval; |
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ext4_free_blocks(handle, inode, NULL, le32_to_cpu(i_data), 1, |
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EXT4_FREE_BLOCKS_METADATA | |
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EXT4_FREE_BLOCKS_FORGET); |
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return 0; |
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} |
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static int free_ind_block(handle_t *handle, struct inode *inode, __le32 *i_data) |
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{ |
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int retval; |
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|
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/* ei->i_data[EXT4_IND_BLOCK] */ |
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if (i_data[0]) { |
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retval = ext4_journal_ensure_credits(handle, |
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EXT4_RESERVE_TRANS_BLOCKS, |
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ext4_free_metadata_revoke_credits(inode->i_sb, 1)); |
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if (retval < 0) |
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return retval; |
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ext4_free_blocks(handle, inode, NULL, |
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le32_to_cpu(i_data[0]), 1, |
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EXT4_FREE_BLOCKS_METADATA | |
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EXT4_FREE_BLOCKS_FORGET); |
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} |
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|
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/* ei->i_data[EXT4_DIND_BLOCK] */ |
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if (i_data[1]) { |
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retval = free_dind_blocks(handle, inode, i_data[1]); |
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if (retval) |
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return retval; |
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} |
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|
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/* ei->i_data[EXT4_TIND_BLOCK] */ |
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if (i_data[2]) { |
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retval = free_tind_blocks(handle, inode, i_data[2]); |
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if (retval) |
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return retval; |
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} |
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return 0; |
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} |
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static int ext4_ext_swap_inode_data(handle_t *handle, struct inode *inode, |
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struct inode *tmp_inode) |
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{ |
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int retval, retval2 = 0; |
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__le32 i_data[3]; |
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struct ext4_inode_info *ei = EXT4_I(inode); |
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struct ext4_inode_info *tmp_ei = EXT4_I(tmp_inode); |
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/* |
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* One credit accounted for writing the |
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* i_data field of the original inode |
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*/ |
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retval = ext4_journal_ensure_credits(handle, 1, 0); |
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if (retval < 0) |
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goto err_out; |
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i_data[0] = ei->i_data[EXT4_IND_BLOCK]; |
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i_data[1] = ei->i_data[EXT4_DIND_BLOCK]; |
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i_data[2] = ei->i_data[EXT4_TIND_BLOCK]; |
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down_write(&EXT4_I(inode)->i_data_sem); |
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/* |
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* if EXT4_STATE_EXT_MIGRATE is cleared a block allocation |
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* happened after we started the migrate. We need to |
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* fail the migrate |
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*/ |
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if (!ext4_test_inode_state(inode, EXT4_STATE_EXT_MIGRATE)) { |
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retval = -EAGAIN; |
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up_write(&EXT4_I(inode)->i_data_sem); |
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goto err_out; |
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} else |
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ext4_clear_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
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/* |
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* We have the extent map build with the tmp inode. |
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* Now copy the i_data across |
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*/ |
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ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS); |
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memcpy(ei->i_data, tmp_ei->i_data, sizeof(ei->i_data)); |
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|
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/* |
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* Update i_blocks with the new blocks that got |
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* allocated while adding extents for extent index |
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* blocks. |
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* |
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* While converting to extents we need not |
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* update the original inode i_blocks for extent blocks |
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* via quota APIs. The quota update happened via tmp_inode already. |
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*/ |
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spin_lock(&inode->i_lock); |
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inode->i_blocks += tmp_inode->i_blocks; |
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spin_unlock(&inode->i_lock); |
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up_write(&EXT4_I(inode)->i_data_sem); |
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|
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/* |
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* We mark the inode dirty after, because we decrement the |
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* i_blocks when freeing the indirect meta-data blocks |
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*/ |
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retval = free_ind_block(handle, inode, i_data); |
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retval2 = ext4_mark_inode_dirty(handle, inode); |
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if (unlikely(retval2 && !retval)) |
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retval = retval2; |
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err_out: |
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return retval; |
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} |
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static int free_ext_idx(handle_t *handle, struct inode *inode, |
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struct ext4_extent_idx *ix) |
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{ |
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int i, retval = 0; |
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ext4_fsblk_t block; |
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struct buffer_head *bh; |
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struct ext4_extent_header *eh; |
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block = ext4_idx_pblock(ix); |
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bh = ext4_sb_bread(inode->i_sb, block, 0); |
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if (IS_ERR(bh)) |
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return PTR_ERR(bh); |
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eh = (struct ext4_extent_header *)bh->b_data; |
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if (eh->eh_depth != 0) { |
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ix = EXT_FIRST_INDEX(eh); |
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for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { |
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retval = free_ext_idx(handle, inode, ix); |
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if (retval) { |
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put_bh(bh); |
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return retval; |
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} |
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} |
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} |
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put_bh(bh); |
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retval = ext4_journal_ensure_credits(handle, EXT4_RESERVE_TRANS_BLOCKS, |
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ext4_free_metadata_revoke_credits(inode->i_sb, 1)); |
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if (retval < 0) |
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return retval; |
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ext4_free_blocks(handle, inode, NULL, block, 1, |
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EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); |
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return 0; |
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} |
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|
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/* |
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* Free the extent meta data blocks only |
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*/ |
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static int free_ext_block(handle_t *handle, struct inode *inode) |
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{ |
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int i, retval = 0; |
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struct ext4_inode_info *ei = EXT4_I(inode); |
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struct ext4_extent_header *eh = (struct ext4_extent_header *)ei->i_data; |
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struct ext4_extent_idx *ix; |
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if (eh->eh_depth == 0) |
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/* |
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* No extra blocks allocated for extent meta data |
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*/ |
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return 0; |
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ix = EXT_FIRST_INDEX(eh); |
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for (i = 0; i < le16_to_cpu(eh->eh_entries); i++, ix++) { |
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retval = free_ext_idx(handle, inode, ix); |
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if (retval) |
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return retval; |
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} |
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return retval; |
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} |
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int ext4_ext_migrate(struct inode *inode) |
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{ |
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
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handle_t *handle; |
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int retval = 0, i; |
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__le32 *i_data; |
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struct ext4_inode_info *ei; |
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struct inode *tmp_inode = NULL; |
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struct migrate_struct lb; |
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unsigned long max_entries; |
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__u32 goal; |
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uid_t owner[2]; |
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|
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/* |
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* If the filesystem does not support extents, or the inode |
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* already is extent-based, error out. |
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*/ |
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if (!ext4_has_feature_extents(inode->i_sb) || |
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(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
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return -EINVAL; |
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|
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if (S_ISLNK(inode->i_mode) && inode->i_blocks == 0) |
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/* |
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* don't migrate fast symlink |
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*/ |
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return retval; |
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|
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percpu_down_write(&sbi->s_writepages_rwsem); |
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|
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/* |
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* Worst case we can touch the allocation bitmaps and a block |
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* group descriptor block. We do need need to worry about |
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* credits for modifying the quota inode. |
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*/ |
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handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, |
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3 + EXT4_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb)); |
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|
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if (IS_ERR(handle)) { |
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retval = PTR_ERR(handle); |
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goto out_unlock; |
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} |
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goal = (((inode->i_ino - 1) / EXT4_INODES_PER_GROUP(inode->i_sb)) * |
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EXT4_INODES_PER_GROUP(inode->i_sb)) + 1; |
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owner[0] = i_uid_read(inode); |
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owner[1] = i_gid_read(inode); |
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tmp_inode = ext4_new_inode(handle, d_inode(inode->i_sb->s_root), |
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S_IFREG, NULL, goal, owner, 0); |
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if (IS_ERR(tmp_inode)) { |
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retval = PTR_ERR(tmp_inode); |
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ext4_journal_stop(handle); |
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goto out_unlock; |
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} |
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/* |
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* Use the correct seed for checksum (i.e. the seed from 'inode'). This |
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* is so that the metadata blocks will have the correct checksum after |
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* the migration. |
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*/ |
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ei = EXT4_I(inode); |
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EXT4_I(tmp_inode)->i_csum_seed = ei->i_csum_seed; |
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i_size_write(tmp_inode, i_size_read(inode)); |
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/* |
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* Set the i_nlink to zero so it will be deleted later |
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* when we drop inode reference. |
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*/ |
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clear_nlink(tmp_inode); |
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|
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ext4_ext_tree_init(handle, tmp_inode); |
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ext4_journal_stop(handle); |
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|
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/* |
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* start with one credit accounted for |
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* superblock modification. |
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* |
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* For the tmp_inode we already have committed the |
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* transaction that created the inode. Later as and |
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* when we add extents we extent the journal |
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*/ |
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/* |
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* Even though we take i_rwsem we can still cause block |
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* allocation via mmap write to holes. If we have allocated |
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* new blocks we fail migrate. New block allocation will |
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* clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated |
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* with i_data_sem held to prevent racing with block |
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* allocation. |
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*/ |
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down_read(&EXT4_I(inode)->i_data_sem); |
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ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE); |
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up_read((&EXT4_I(inode)->i_data_sem)); |
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|
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handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1); |
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if (IS_ERR(handle)) { |
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retval = PTR_ERR(handle); |
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goto out_tmp_inode; |
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} |
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|
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i_data = ei->i_data; |
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memset(&lb, 0, sizeof(lb)); |
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|
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/* 32 bit block address 4 bytes */ |
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max_entries = inode->i_sb->s_blocksize >> 2; |
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for (i = 0; i < EXT4_NDIR_BLOCKS; i++) { |
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if (i_data[i]) { |
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retval = update_extent_range(handle, tmp_inode, |
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le32_to_cpu(i_data[i]), &lb); |
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if (retval) |
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goto err_out; |
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} else |
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lb.curr_block++; |
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} |
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if (i_data[EXT4_IND_BLOCK]) { |
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retval = update_ind_extent_range(handle, tmp_inode, |
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le32_to_cpu(i_data[EXT4_IND_BLOCK]), &lb); |
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if (retval) |
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goto err_out; |
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} else |
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lb.curr_block += max_entries; |
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if (i_data[EXT4_DIND_BLOCK]) { |
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retval = update_dind_extent_range(handle, tmp_inode, |
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le32_to_cpu(i_data[EXT4_DIND_BLOCK]), &lb); |
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if (retval) |
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goto err_out; |
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} else |
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lb.curr_block += max_entries * max_entries; |
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if (i_data[EXT4_TIND_BLOCK]) { |
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retval = update_tind_extent_range(handle, tmp_inode, |
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le32_to_cpu(i_data[EXT4_TIND_BLOCK]), &lb); |
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if (retval) |
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goto err_out; |
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} |
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/* |
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* Build the last extent |
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*/ |
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retval = finish_range(handle, tmp_inode, &lb); |
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err_out: |
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if (retval) |
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/* |
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* Failure case delete the extent information with the |
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* tmp_inode |
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*/ |
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free_ext_block(handle, tmp_inode); |
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else { |
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retval = ext4_ext_swap_inode_data(handle, inode, tmp_inode); |
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if (retval) |
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/* |
|
* if we fail to swap inode data free the extent |
|
* details of the tmp inode |
|
*/ |
|
free_ext_block(handle, tmp_inode); |
|
} |
|
|
|
/* We mark the tmp_inode dirty via ext4_ext_tree_init. */ |
|
retval = ext4_journal_ensure_credits(handle, 1, 0); |
|
if (retval < 0) |
|
goto out_stop; |
|
/* |
|
* Mark the tmp_inode as of size zero |
|
*/ |
|
i_size_write(tmp_inode, 0); |
|
|
|
/* |
|
* set the i_blocks count to zero |
|
* so that the ext4_evict_inode() does the |
|
* right job |
|
* |
|
* We don't need to take the i_lock because |
|
* the inode is not visible to user space. |
|
*/ |
|
tmp_inode->i_blocks = 0; |
|
|
|
/* Reset the extent details */ |
|
ext4_ext_tree_init(handle, tmp_inode); |
|
out_stop: |
|
ext4_journal_stop(handle); |
|
out_tmp_inode: |
|
unlock_new_inode(tmp_inode); |
|
iput(tmp_inode); |
|
out_unlock: |
|
percpu_up_write(&sbi->s_writepages_rwsem); |
|
return retval; |
|
} |
|
|
|
/* |
|
* Migrate a simple extent-based inode to use the i_blocks[] array |
|
*/ |
|
int ext4_ind_migrate(struct inode *inode) |
|
{ |
|
struct ext4_extent_header *eh; |
|
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); |
|
struct ext4_super_block *es = sbi->s_es; |
|
struct ext4_inode_info *ei = EXT4_I(inode); |
|
struct ext4_extent *ex; |
|
unsigned int i, len; |
|
ext4_lblk_t start, end; |
|
ext4_fsblk_t blk; |
|
handle_t *handle; |
|
int ret, ret2 = 0; |
|
|
|
if (!ext4_has_feature_extents(inode->i_sb) || |
|
(!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) |
|
return -EINVAL; |
|
|
|
if (ext4_has_feature_bigalloc(inode->i_sb)) |
|
return -EOPNOTSUPP; |
|
|
|
/* |
|
* In order to get correct extent info, force all delayed allocation |
|
* blocks to be allocated, otherwise delayed allocation blocks may not |
|
* be reflected and bypass the checks on extent header. |
|
*/ |
|
if (test_opt(inode->i_sb, DELALLOC)) |
|
ext4_alloc_da_blocks(inode); |
|
|
|
percpu_down_write(&sbi->s_writepages_rwsem); |
|
|
|
handle = ext4_journal_start(inode, EXT4_HT_MIGRATE, 1); |
|
if (IS_ERR(handle)) { |
|
ret = PTR_ERR(handle); |
|
goto out_unlock; |
|
} |
|
|
|
down_write(&EXT4_I(inode)->i_data_sem); |
|
ret = ext4_ext_check_inode(inode); |
|
if (ret) |
|
goto errout; |
|
|
|
eh = ext_inode_hdr(inode); |
|
ex = EXT_FIRST_EXTENT(eh); |
|
if (ext4_blocks_count(es) > EXT4_MAX_BLOCK_FILE_PHYS || |
|
eh->eh_depth != 0 || le16_to_cpu(eh->eh_entries) > 1) { |
|
ret = -EOPNOTSUPP; |
|
goto errout; |
|
} |
|
if (eh->eh_entries == 0) |
|
blk = len = start = end = 0; |
|
else { |
|
len = le16_to_cpu(ex->ee_len); |
|
blk = ext4_ext_pblock(ex); |
|
start = le32_to_cpu(ex->ee_block); |
|
end = start + len - 1; |
|
if (end >= EXT4_NDIR_BLOCKS) { |
|
ret = -EOPNOTSUPP; |
|
goto errout; |
|
} |
|
} |
|
|
|
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); |
|
memset(ei->i_data, 0, sizeof(ei->i_data)); |
|
for (i = start; i <= end; i++) |
|
ei->i_data[i] = cpu_to_le32(blk++); |
|
ret2 = ext4_mark_inode_dirty(handle, inode); |
|
if (unlikely(ret2 && !ret)) |
|
ret = ret2; |
|
errout: |
|
ext4_journal_stop(handle); |
|
up_write(&EXT4_I(inode)->i_data_sem); |
|
out_unlock: |
|
percpu_up_write(&sbi->s_writepages_rwsem); |
|
return ret; |
|
}
|
|
|