Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/cred.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include "exfat_raw.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include "exfat_fs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) static int exfat_cont_expand(struct inode *inode, loff_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 	struct address_space *mapping = inode->i_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 	loff_t start = i_size_read(inode), count = size - i_size_read(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 	int err, err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	err = generic_cont_expand_simple(inode, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	inode->i_ctime = inode->i_mtime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	if (!IS_SYNC(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	err = filemap_fdatawrite_range(mapping, start, start + count - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	err2 = sync_mapping_buffers(mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		err = err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	err2 = write_inode_now(inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		err = err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	return filemap_fdatawait_range(mapping, start, start + count - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) static bool exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	mode_t allow_utime = sbi->options.allow_utime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	if (!uid_eq(current_fsuid(), inode->i_uid)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		if (in_group_p(inode->i_gid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			allow_utime >>= 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		if (allow_utime & MAY_WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 			return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	/* use a default check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static int exfat_sanitize_mode(const struct exfat_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		struct inode *inode, umode_t *mode_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	mode_t i_mode, mask, perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	i_mode = inode->i_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	mask = (S_ISREG(i_mode) || S_ISLNK(i_mode)) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		sbi->options.fs_fmask : sbi->options.fs_dmask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	perm = *mode_ptr & ~(S_IFMT | mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	/* Of the r and x bits, all (subject to umask) must be present.*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	if ((perm & 0555) != (i_mode & 0555))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	if (exfat_mode_can_hold_ro(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		 * Of the w bits, either all (subject to umask) or none must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		 * be present.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		 * If exfat_mode_can_hold_ro(inode) is false, can't change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		 * w bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		if ((perm & 0222) != (0222 & ~mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	*mode_ptr &= S_IFMT | perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) /* resize the file length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) int __exfat_truncate(struct inode *inode, loff_t new_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	unsigned int num_clusters_new, num_clusters_phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	unsigned int last_clu = EXFAT_FREE_CLUSTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct exfat_chain clu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct exfat_inode_info *ei = EXFAT_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	int evict = (ei->dir.dir == DIR_DELETED) ? 1 : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	/* check if the given file ID is opened */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (ei->type != TYPE_FILE && ei->type != TYPE_DIR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	exfat_set_volume_dirty(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	num_clusters_phys = EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (new_size > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		 * Truncate FAT chain num_clusters after the first cluster
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		 * num_clusters = min(new, phys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		unsigned int num_clusters =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			min(num_clusters_new, num_clusters_phys);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		 * Follow FAT chain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		 * (defensive coding - works fine even with corrupted FAT table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		if (clu.flags == ALLOC_NO_FAT_CHAIN) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			clu.dir += num_clusters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			clu.size -= num_clusters;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 			while (num_clusters > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 				last_clu = clu.dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 				if (exfat_get_next_cluster(sb, &(clu.dir)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 					return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 				num_clusters--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 				clu.size--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		ei->flags = ALLOC_NO_FAT_CHAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		ei->start_clu = EXFAT_EOF_CLUSTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	i_size_write(inode, new_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (ei->type == TYPE_FILE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		ei->attr |= ATTR_ARCHIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	/* update the directory entry */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (!evict) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		struct timespec64 ts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		struct exfat_dentry *ep, *ep2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		struct exfat_entry_set_cache *es;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		es = exfat_get_dentry_set(sb, &(ei->dir), ei->entry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 				ES_ALL_ENTRIES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		if (!es)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		ep = exfat_get_dentry_cached(es, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		ep2 = exfat_get_dentry_cached(es, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		ts = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		exfat_set_entry_time(sbi, &ts,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 				&ep->dentry.file.modify_tz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 				&ep->dentry.file.modify_time,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 				&ep->dentry.file.modify_date,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 				&ep->dentry.file.modify_time_cs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		ep->dentry.file.attr = cpu_to_le16(ei->attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		/* File size should be zero if there is no cluster allocated */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		if (ei->start_clu == EXFAT_EOF_CLUSTER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			ep2->dentry.stream.valid_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			ep2->dentry.stream.size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 			ep2->dentry.stream.valid_size = cpu_to_le64(new_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			ep2->dentry.stream.size = ep2->dentry.stream.valid_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		if (new_size == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 			/* Any directory can not be truncated to zero */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			WARN_ON(ei->type != TYPE_FILE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			ep2->dentry.stream.flags = ALLOC_FAT_CHAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		exfat_update_dir_chksum_with_entry_set(es);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		err = exfat_free_dentry_set(es, inode_needs_sync(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	/* cut off from the FAT chain */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 			last_clu != EXFAT_EOF_CLUSTER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	/* invalidate cache and free the clusters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	/* clear exfat cache */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	exfat_cache_inval_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	/* hint information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	ei->hint_bmap.off = EXFAT_EOF_CLUSTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	ei->hint_bmap.clu = EXFAT_EOF_CLUSTER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	/* hint_stat will be used if this is directory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	ei->hint_stat.eidx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	ei->hint_stat.clu = ei->start_clu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	ei->hint_femp.eidx = EXFAT_HINT_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	/* free the clusters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (exfat_free_cluster(inode, &clu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	exfat_clear_volume_dirty(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) void exfat_truncate(struct inode *inode, loff_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	struct exfat_inode_info *ei = EXFAT_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	unsigned int blocksize = i_blocksize(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	loff_t aligned_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	mutex_lock(&sbi->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	if (ei->start_clu == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		 * Empty start_clu != ~0 (not allocated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		exfat_fs_error(sb, "tried to truncate zeroed cluster.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		goto write_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	err = __exfat_truncate(inode, i_size_read(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		goto write_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	inode->i_ctime = inode->i_mtime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	if (IS_DIRSYNC(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		exfat_sync_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 				inode->i_blkbits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) write_size:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	aligned_size = i_size_read(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	if (aligned_size & (blocksize - 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		aligned_size |= (blocksize - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		aligned_size++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	if (ei->i_size_ondisk > i_size_read(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		ei->i_size_ondisk = aligned_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (ei->i_size_aligned > i_size_read(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		ei->i_size_aligned = aligned_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	mutex_unlock(&sbi->s_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) int exfat_getattr(const struct path *path, struct kstat *stat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		unsigned int request_mask, unsigned int query_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	struct inode *inode = d_backing_inode(path->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	struct exfat_inode_info *ei = EXFAT_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	generic_fillattr(inode, stat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	exfat_truncate_atime(&stat->atime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	stat->result_mask |= STATX_BTIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	stat->btime.tv_sec = ei->i_crtime.tv_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	stat->btime.tv_nsec = ei->i_crtime.tv_nsec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) int exfat_setattr(struct dentry *dentry, struct iattr *attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	struct inode *inode = dentry->d_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	unsigned int ia_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if ((attr->ia_valid & ATTR_SIZE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	    attr->ia_size > i_size_read(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 		error = exfat_cont_expand(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		if (error || attr->ia_valid == ATTR_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 		attr->ia_valid &= ~ATTR_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	/* Check for setting the inode time. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	ia_valid = attr->ia_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	    exfat_allow_set_time(sbi, inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 				ATTR_TIMES_SET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	error = setattr_prepare(dentry, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	attr->ia_valid = ia_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	if (((attr->ia_valid & ATTR_UID) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	     !uid_eq(attr->ia_uid, sbi->options.fs_uid)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	    ((attr->ia_valid & ATTR_GID) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	     !gid_eq(attr->ia_gid, sbi->options.fs_gid)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	    ((attr->ia_valid & ATTR_MODE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	     (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	 * We don't return -EPERM here. Yes, strange, but this is too
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	 * old behavior.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	if (attr->ia_valid & ATTR_MODE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 		if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 			attr->ia_valid &= ~ATTR_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (attr->ia_valid & ATTR_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		error = exfat_block_truncate_page(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		down_write(&EXFAT_I(inode)->truncate_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		truncate_setsize(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		exfat_truncate(inode, attr->ia_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		up_write(&EXFAT_I(inode)->truncate_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	setattr_copy(inode, attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	exfat_truncate_atime(&inode->i_atime);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	struct inode *inode = filp->f_mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	err = __generic_file_fsync(filp, start, end, datasync);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	err = sync_blockdev(inode->i_sb->s_bdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	return blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) const struct file_operations exfat_file_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	.llseek		= generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	.read_iter	= generic_file_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	.write_iter	= generic_file_write_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	.mmap		= generic_file_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	.fsync		= exfat_file_fsync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	.splice_read	= generic_file_splice_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	.splice_write	= iter_file_splice_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) const struct inode_operations exfat_file_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	.setattr     = exfat_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	.getattr     = exfat_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) };