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657 lines
17 KiB
657 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. |
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*/ |
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|
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#include <linux/init.h> |
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#include <linux/buffer_head.h> |
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#include <linux/mpage.h> |
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#include <linux/bio.h> |
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#include <linux/blkdev.h> |
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#include <linux/time.h> |
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#include <linux/writeback.h> |
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#include <linux/uio.h> |
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#include <linux/random.h> |
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#include <linux/iversion.h> |
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|
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#include "exfat_raw.h" |
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#include "exfat_fs.h" |
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static int __exfat_write_inode(struct inode *inode, int sync) |
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{ |
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unsigned long long on_disk_size; |
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struct exfat_dentry *ep, *ep2; |
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struct exfat_entry_set_cache *es = NULL; |
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struct super_block *sb = inode->i_sb; |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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struct exfat_inode_info *ei = EXFAT_I(inode); |
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bool is_dir = (ei->type == TYPE_DIR) ? true : false; |
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if (inode->i_ino == EXFAT_ROOT_INO) |
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return 0; |
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/* |
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* If the indode is already unlinked, there is no need for updating it. |
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*/ |
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if (ei->dir.dir == DIR_DELETED) |
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return 0; |
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if (is_dir && ei->dir.dir == sbi->root_dir && ei->entry == -1) |
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return 0; |
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exfat_set_volume_dirty(sb); |
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/* get the directory entry of given file or directory */ |
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es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, ES_ALL_ENTRIES); |
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if (!es) |
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return -EIO; |
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ep = exfat_get_dentry_cached(es, 0); |
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ep2 = exfat_get_dentry_cached(es, 1); |
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ep->dentry.file.attr = cpu_to_le16(exfat_make_attr(inode)); |
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/* set FILE_INFO structure using the acquired struct exfat_dentry */ |
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exfat_set_entry_time(sbi, &ei->i_crtime, |
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&ep->dentry.file.create_tz, |
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&ep->dentry.file.create_time, |
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&ep->dentry.file.create_date, |
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&ep->dentry.file.create_time_cs); |
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exfat_set_entry_time(sbi, &inode->i_mtime, |
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&ep->dentry.file.modify_tz, |
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&ep->dentry.file.modify_time, |
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&ep->dentry.file.modify_date, |
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&ep->dentry.file.modify_time_cs); |
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exfat_set_entry_time(sbi, &inode->i_atime, |
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&ep->dentry.file.access_tz, |
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&ep->dentry.file.access_time, |
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&ep->dentry.file.access_date, |
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NULL); |
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/* File size should be zero if there is no cluster allocated */ |
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on_disk_size = i_size_read(inode); |
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if (ei->start_clu == EXFAT_EOF_CLUSTER) |
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on_disk_size = 0; |
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ep2->dentry.stream.valid_size = cpu_to_le64(on_disk_size); |
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ep2->dentry.stream.size = ep2->dentry.stream.valid_size; |
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exfat_update_dir_chksum_with_entry_set(es); |
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return exfat_free_dentry_set(es, sync); |
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} |
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int exfat_write_inode(struct inode *inode, struct writeback_control *wbc) |
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{ |
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int ret; |
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mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); |
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ret = __exfat_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL); |
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mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); |
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return ret; |
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} |
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void exfat_sync_inode(struct inode *inode) |
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{ |
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lockdep_assert_held(&EXFAT_SB(inode->i_sb)->s_lock); |
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__exfat_write_inode(inode, 1); |
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} |
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/* |
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* Input: inode, (logical) clu_offset, target allocation area |
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* Output: errcode, cluster number |
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* *clu = (~0), if it's unable to allocate a new cluster |
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*/ |
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static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset, |
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unsigned int *clu, int create) |
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{ |
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int ret, modified = false; |
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unsigned int last_clu; |
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struct exfat_chain new_clu; |
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struct super_block *sb = inode->i_sb; |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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struct exfat_inode_info *ei = EXFAT_I(inode); |
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unsigned int local_clu_offset = clu_offset; |
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unsigned int num_to_be_allocated = 0, num_clusters = 0; |
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if (EXFAT_I(inode)->i_size_ondisk > 0) |
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num_clusters = |
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EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk, |
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sbi); |
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if (clu_offset >= num_clusters) |
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num_to_be_allocated = clu_offset - num_clusters + 1; |
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if (!create && (num_to_be_allocated > 0)) { |
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*clu = EXFAT_EOF_CLUSTER; |
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return 0; |
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} |
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*clu = last_clu = ei->start_clu; |
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if (ei->flags == ALLOC_NO_FAT_CHAIN) { |
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if (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) { |
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last_clu += clu_offset - 1; |
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if (clu_offset == num_clusters) |
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*clu = EXFAT_EOF_CLUSTER; |
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else |
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*clu += clu_offset; |
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} |
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} else if (ei->type == TYPE_FILE) { |
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unsigned int fclus = 0; |
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int err = exfat_get_cluster(inode, clu_offset, |
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&fclus, clu, &last_clu, 1); |
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if (err) |
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return -EIO; |
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clu_offset -= fclus; |
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} else { |
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/* hint information */ |
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if (clu_offset > 0 && ei->hint_bmap.off != EXFAT_EOF_CLUSTER && |
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ei->hint_bmap.off > 0 && clu_offset >= ei->hint_bmap.off) { |
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clu_offset -= ei->hint_bmap.off; |
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/* hint_bmap.clu should be valid */ |
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WARN_ON(ei->hint_bmap.clu < 2); |
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*clu = ei->hint_bmap.clu; |
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} |
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while (clu_offset > 0 && *clu != EXFAT_EOF_CLUSTER) { |
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last_clu = *clu; |
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if (exfat_get_next_cluster(sb, clu)) |
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return -EIO; |
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clu_offset--; |
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} |
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} |
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if (*clu == EXFAT_EOF_CLUSTER) { |
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exfat_set_volume_dirty(sb); |
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new_clu.dir = (last_clu == EXFAT_EOF_CLUSTER) ? |
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EXFAT_EOF_CLUSTER : last_clu + 1; |
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new_clu.size = 0; |
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new_clu.flags = ei->flags; |
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/* allocate a cluster */ |
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if (num_to_be_allocated < 1) { |
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/* Broken FAT (i_sze > allocated FAT) */ |
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exfat_fs_error(sb, "broken FAT chain."); |
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return -EIO; |
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} |
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ret = exfat_alloc_cluster(inode, num_to_be_allocated, &new_clu); |
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if (ret) |
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return ret; |
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if (new_clu.dir == EXFAT_EOF_CLUSTER || |
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new_clu.dir == EXFAT_FREE_CLUSTER) { |
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exfat_fs_error(sb, |
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"bogus cluster new allocated (last_clu : %u, new_clu : %u)", |
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last_clu, new_clu.dir); |
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return -EIO; |
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} |
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/* append to the FAT chain */ |
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if (last_clu == EXFAT_EOF_CLUSTER) { |
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if (new_clu.flags == ALLOC_FAT_CHAIN) |
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ei->flags = ALLOC_FAT_CHAIN; |
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ei->start_clu = new_clu.dir; |
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modified = true; |
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} else { |
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if (new_clu.flags != ei->flags) { |
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/* no-fat-chain bit is disabled, |
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* so fat-chain should be synced with |
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* alloc-bitmap |
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*/ |
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exfat_chain_cont_cluster(sb, ei->start_clu, |
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num_clusters); |
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ei->flags = ALLOC_FAT_CHAIN; |
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modified = true; |
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} |
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if (new_clu.flags == ALLOC_FAT_CHAIN) |
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if (exfat_ent_set(sb, last_clu, new_clu.dir)) |
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return -EIO; |
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} |
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num_clusters += num_to_be_allocated; |
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*clu = new_clu.dir; |
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if (ei->dir.dir != DIR_DELETED && modified) { |
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struct exfat_dentry *ep; |
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struct exfat_entry_set_cache *es; |
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int err; |
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es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry, |
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ES_ALL_ENTRIES); |
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if (!es) |
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return -EIO; |
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/* get stream entry */ |
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ep = exfat_get_dentry_cached(es, 1); |
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/* update directory entry */ |
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ep->dentry.stream.flags = ei->flags; |
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ep->dentry.stream.start_clu = |
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cpu_to_le32(ei->start_clu); |
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ep->dentry.stream.valid_size = |
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cpu_to_le64(i_size_read(inode)); |
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ep->dentry.stream.size = |
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ep->dentry.stream.valid_size; |
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exfat_update_dir_chksum_with_entry_set(es); |
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err = exfat_free_dentry_set(es, inode_needs_sync(inode)); |
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if (err) |
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return err; |
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} /* end of if != DIR_DELETED */ |
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inode->i_blocks += |
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num_to_be_allocated << sbi->sect_per_clus_bits; |
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/* |
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* Move *clu pointer along FAT chains (hole care) because the |
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* caller of this function expect *clu to be the last cluster. |
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* This only works when num_to_be_allocated >= 2, |
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* *clu = (the first cluster of the allocated chain) => |
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* (the last cluster of ...) |
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*/ |
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if (ei->flags == ALLOC_NO_FAT_CHAIN) { |
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*clu += num_to_be_allocated - 1; |
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} else { |
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while (num_to_be_allocated > 1) { |
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if (exfat_get_next_cluster(sb, clu)) |
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return -EIO; |
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num_to_be_allocated--; |
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} |
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} |
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} |
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/* hint information */ |
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ei->hint_bmap.off = local_clu_offset; |
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ei->hint_bmap.clu = *clu; |
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return 0; |
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} |
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static int exfat_map_new_buffer(struct exfat_inode_info *ei, |
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struct buffer_head *bh, loff_t pos) |
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{ |
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if (buffer_delay(bh) && pos > ei->i_size_aligned) |
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return -EIO; |
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set_buffer_new(bh); |
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/* |
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* Adjust i_size_aligned if i_size_ondisk is bigger than it. |
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*/ |
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if (ei->i_size_ondisk > ei->i_size_aligned) |
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ei->i_size_aligned = ei->i_size_ondisk; |
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return 0; |
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} |
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static int exfat_get_block(struct inode *inode, sector_t iblock, |
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struct buffer_head *bh_result, int create) |
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{ |
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struct exfat_inode_info *ei = EXFAT_I(inode); |
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struct super_block *sb = inode->i_sb; |
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struct exfat_sb_info *sbi = EXFAT_SB(sb); |
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unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; |
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int err = 0; |
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unsigned long mapped_blocks = 0; |
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unsigned int cluster, sec_offset; |
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sector_t last_block; |
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sector_t phys = 0; |
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loff_t pos; |
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mutex_lock(&sbi->s_lock); |
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last_block = EXFAT_B_TO_BLK_ROUND_UP(i_size_read(inode), sb); |
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if (iblock >= last_block && !create) |
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goto done; |
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/* Is this block already allocated? */ |
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err = exfat_map_cluster(inode, iblock >> sbi->sect_per_clus_bits, |
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&cluster, create); |
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if (err) { |
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if (err != -ENOSPC) |
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exfat_fs_error_ratelimit(sb, |
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"failed to bmap (inode : %p iblock : %llu, err : %d)", |
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inode, (unsigned long long)iblock, err); |
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goto unlock_ret; |
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} |
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if (cluster == EXFAT_EOF_CLUSTER) |
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goto done; |
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/* sector offset in cluster */ |
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sec_offset = iblock & (sbi->sect_per_clus - 1); |
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phys = exfat_cluster_to_sector(sbi, cluster) + sec_offset; |
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mapped_blocks = sbi->sect_per_clus - sec_offset; |
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max_blocks = min(mapped_blocks, max_blocks); |
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/* Treat newly added block / cluster */ |
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if (iblock < last_block) |
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create = 0; |
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if (create || buffer_delay(bh_result)) { |
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pos = EXFAT_BLK_TO_B((iblock + 1), sb); |
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if (ei->i_size_ondisk < pos) |
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ei->i_size_ondisk = pos; |
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} |
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if (create) { |
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err = exfat_map_new_buffer(ei, bh_result, pos); |
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if (err) { |
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exfat_fs_error(sb, |
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"requested for bmap out of range(pos : (%llu) > i_size_aligned(%llu)\n", |
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pos, ei->i_size_aligned); |
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goto unlock_ret; |
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} |
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} |
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if (buffer_delay(bh_result)) |
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clear_buffer_delay(bh_result); |
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map_bh(bh_result, sb, phys); |
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done: |
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bh_result->b_size = EXFAT_BLK_TO_B(max_blocks, sb); |
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unlock_ret: |
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mutex_unlock(&sbi->s_lock); |
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return err; |
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} |
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static int exfat_readpage(struct file *file, struct page *page) |
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{ |
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return mpage_readpage(page, exfat_get_block); |
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} |
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static void exfat_readahead(struct readahead_control *rac) |
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{ |
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mpage_readahead(rac, exfat_get_block); |
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} |
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static int exfat_writepage(struct page *page, struct writeback_control *wbc) |
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{ |
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return block_write_full_page(page, exfat_get_block, wbc); |
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} |
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static int exfat_writepages(struct address_space *mapping, |
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struct writeback_control *wbc) |
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{ |
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return mpage_writepages(mapping, wbc, exfat_get_block); |
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} |
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static void exfat_write_failed(struct address_space *mapping, loff_t to) |
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{ |
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struct inode *inode = mapping->host; |
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if (to > i_size_read(inode)) { |
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truncate_pagecache(inode, i_size_read(inode)); |
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exfat_truncate(inode, EXFAT_I(inode)->i_size_aligned); |
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} |
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} |
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static int exfat_write_begin(struct file *file, struct address_space *mapping, |
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loff_t pos, unsigned int len, unsigned int flags, |
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struct page **pagep, void **fsdata) |
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{ |
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int ret; |
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*pagep = NULL; |
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ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
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exfat_get_block, |
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&EXFAT_I(mapping->host)->i_size_ondisk); |
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if (ret < 0) |
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exfat_write_failed(mapping, pos+len); |
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return ret; |
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} |
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static int exfat_write_end(struct file *file, struct address_space *mapping, |
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loff_t pos, unsigned int len, unsigned int copied, |
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struct page *pagep, void *fsdata) |
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{ |
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struct inode *inode = mapping->host; |
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struct exfat_inode_info *ei = EXFAT_I(inode); |
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int err; |
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err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); |
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if (EXFAT_I(inode)->i_size_aligned < i_size_read(inode)) { |
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exfat_fs_error(inode->i_sb, |
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"invalid size(size(%llu) > aligned(%llu)\n", |
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i_size_read(inode), EXFAT_I(inode)->i_size_aligned); |
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return -EIO; |
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} |
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if (err < len) |
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exfat_write_failed(mapping, pos+len); |
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if (!(err < 0) && !(ei->attr & ATTR_ARCHIVE)) { |
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inode->i_mtime = inode->i_ctime = current_time(inode); |
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ei->attr |= ATTR_ARCHIVE; |
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mark_inode_dirty(inode); |
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} |
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return err; |
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} |
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static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
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{ |
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struct address_space *mapping = iocb->ki_filp->f_mapping; |
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struct inode *inode = mapping->host; |
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loff_t size = iocb->ki_pos + iov_iter_count(iter); |
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int rw = iov_iter_rw(iter); |
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ssize_t ret; |
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if (rw == WRITE) { |
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/* |
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* FIXME: blockdev_direct_IO() doesn't use ->write_begin(), |
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* so we need to update the ->i_size_aligned to block boundary. |
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* |
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* But we must fill the remaining area or hole by nul for |
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* updating ->i_size_aligned |
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* |
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* Return 0, and fallback to normal buffered write. |
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*/ |
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if (EXFAT_I(inode)->i_size_aligned < size) |
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return 0; |
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} |
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|
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/* |
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* Need to use the DIO_LOCKING for avoiding the race |
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* condition of exfat_get_block() and ->truncate(). |
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*/ |
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ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block); |
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if (ret < 0 && (rw & WRITE)) |
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exfat_write_failed(mapping, size); |
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return ret; |
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} |
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static sector_t exfat_aop_bmap(struct address_space *mapping, sector_t block) |
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{ |
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sector_t blocknr; |
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|
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/* exfat_get_cluster() assumes the requested blocknr isn't truncated. */ |
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down_read(&EXFAT_I(mapping->host)->truncate_lock); |
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blocknr = generic_block_bmap(mapping, block, exfat_get_block); |
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up_read(&EXFAT_I(mapping->host)->truncate_lock); |
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return blocknr; |
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} |
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|
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/* |
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* exfat_block_truncate_page() zeroes out a mapping from file offset `from' |
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* up to the end of the block which corresponds to `from'. |
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* This is required during truncate to physically zeroout the tail end |
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* of that block so it doesn't yield old data if the file is later grown. |
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* Also, avoid causing failure from fsx for cases of "data past EOF" |
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*/ |
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int exfat_block_truncate_page(struct inode *inode, loff_t from) |
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{ |
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return block_truncate_page(inode->i_mapping, from, exfat_get_block); |
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} |
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|
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static const struct address_space_operations exfat_aops = { |
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.readpage = exfat_readpage, |
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.readahead = exfat_readahead, |
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.writepage = exfat_writepage, |
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.writepages = exfat_writepages, |
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.write_begin = exfat_write_begin, |
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.write_end = exfat_write_end, |
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.direct_IO = exfat_direct_IO, |
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.bmap = exfat_aop_bmap |
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}; |
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|
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static inline unsigned long exfat_hash(loff_t i_pos) |
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{ |
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return hash_32(i_pos, EXFAT_HASH_BITS); |
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} |
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|
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void exfat_hash_inode(struct inode *inode, loff_t i_pos) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); |
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struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); |
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|
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spin_lock(&sbi->inode_hash_lock); |
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EXFAT_I(inode)->i_pos = i_pos; |
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hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head); |
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spin_unlock(&sbi->inode_hash_lock); |
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} |
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|
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void exfat_unhash_inode(struct inode *inode) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); |
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|
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spin_lock(&sbi->inode_hash_lock); |
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hlist_del_init(&EXFAT_I(inode)->i_hash_fat); |
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EXFAT_I(inode)->i_pos = 0; |
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spin_unlock(&sbi->inode_hash_lock); |
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} |
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|
|
struct inode *exfat_iget(struct super_block *sb, loff_t i_pos) |
|
{ |
|
struct exfat_sb_info *sbi = EXFAT_SB(sb); |
|
struct exfat_inode_info *info; |
|
struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); |
|
struct inode *inode = NULL; |
|
|
|
spin_lock(&sbi->inode_hash_lock); |
|
hlist_for_each_entry(info, head, i_hash_fat) { |
|
WARN_ON(info->vfs_inode.i_sb != sb); |
|
|
|
if (i_pos != info->i_pos) |
|
continue; |
|
inode = igrab(&info->vfs_inode); |
|
if (inode) |
|
break; |
|
} |
|
spin_unlock(&sbi->inode_hash_lock); |
|
return inode; |
|
} |
|
|
|
/* doesn't deal with root inode */ |
|
static int exfat_fill_inode(struct inode *inode, struct exfat_dir_entry *info) |
|
{ |
|
struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); |
|
struct exfat_inode_info *ei = EXFAT_I(inode); |
|
loff_t size = info->size; |
|
|
|
ei->dir = info->dir; |
|
ei->entry = info->entry; |
|
ei->attr = info->attr; |
|
ei->start_clu = info->start_clu; |
|
ei->flags = info->flags; |
|
ei->type = info->type; |
|
|
|
ei->version = 0; |
|
ei->hint_stat.eidx = 0; |
|
ei->hint_stat.clu = info->start_clu; |
|
ei->hint_femp.eidx = EXFAT_HINT_NONE; |
|
ei->hint_bmap.off = EXFAT_EOF_CLUSTER; |
|
ei->i_pos = 0; |
|
|
|
inode->i_uid = sbi->options.fs_uid; |
|
inode->i_gid = sbi->options.fs_gid; |
|
inode_inc_iversion(inode); |
|
inode->i_generation = prandom_u32(); |
|
|
|
if (info->attr & ATTR_SUBDIR) { /* directory */ |
|
inode->i_generation &= ~1; |
|
inode->i_mode = exfat_make_mode(sbi, info->attr, 0777); |
|
inode->i_op = &exfat_dir_inode_operations; |
|
inode->i_fop = &exfat_dir_operations; |
|
set_nlink(inode, info->num_subdirs); |
|
} else { /* regular file */ |
|
inode->i_generation |= 1; |
|
inode->i_mode = exfat_make_mode(sbi, info->attr, 0777); |
|
inode->i_op = &exfat_file_inode_operations; |
|
inode->i_fop = &exfat_file_operations; |
|
inode->i_mapping->a_ops = &exfat_aops; |
|
inode->i_mapping->nrpages = 0; |
|
} |
|
|
|
i_size_write(inode, size); |
|
|
|
/* ondisk and aligned size should be aligned with block size */ |
|
if (size & (inode->i_sb->s_blocksize - 1)) { |
|
size |= (inode->i_sb->s_blocksize - 1); |
|
size++; |
|
} |
|
|
|
ei->i_size_aligned = size; |
|
ei->i_size_ondisk = size; |
|
|
|
exfat_save_attr(inode, info->attr); |
|
|
|
inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) & |
|
~(sbi->cluster_size - 1)) >> inode->i_blkbits; |
|
inode->i_mtime = info->mtime; |
|
inode->i_ctime = info->mtime; |
|
ei->i_crtime = info->crtime; |
|
inode->i_atime = info->atime; |
|
|
|
return 0; |
|
} |
|
|
|
struct inode *exfat_build_inode(struct super_block *sb, |
|
struct exfat_dir_entry *info, loff_t i_pos) |
|
{ |
|
struct inode *inode; |
|
int err; |
|
|
|
inode = exfat_iget(sb, i_pos); |
|
if (inode) |
|
goto out; |
|
inode = new_inode(sb); |
|
if (!inode) { |
|
inode = ERR_PTR(-ENOMEM); |
|
goto out; |
|
} |
|
inode->i_ino = iunique(sb, EXFAT_ROOT_INO); |
|
inode_set_iversion(inode, 1); |
|
err = exfat_fill_inode(inode, info); |
|
if (err) { |
|
iput(inode); |
|
inode = ERR_PTR(err); |
|
goto out; |
|
} |
|
exfat_hash_inode(inode, i_pos); |
|
insert_inode_hash(inode); |
|
out: |
|
return inode; |
|
} |
|
|
|
void exfat_evict_inode(struct inode *inode) |
|
{ |
|
truncate_inode_pages(&inode->i_data, 0); |
|
|
|
if (!inode->i_nlink) { |
|
i_size_write(inode, 0); |
|
mutex_lock(&EXFAT_SB(inode->i_sb)->s_lock); |
|
__exfat_truncate(inode, 0); |
|
mutex_unlock(&EXFAT_SB(inode->i_sb)->s_lock); |
|
} |
|
|
|
invalidate_inode_buffers(inode); |
|
clear_inode(inode); |
|
exfat_cache_inval_inode(inode); |
|
exfat_unhash_inode(inode); |
|
}
|
|
|