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435 lines
11 KiB
435 lines
11 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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#include <linux/slab.h> |
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#include <linux/compat.h> |
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#include <linux/cred.h> |
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#include <linux/buffer_head.h> |
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#include <linux/blkdev.h> |
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#include "exfat_raw.h" |
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#include "exfat_fs.h" |
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static int exfat_cont_expand(struct inode *inode, loff_t size) |
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{ |
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struct address_space *mapping = inode->i_mapping; |
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loff_t start = i_size_read(inode), count = size - i_size_read(inode); |
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int err, err2; |
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err = generic_cont_expand_simple(inode, size); |
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if (err) |
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return err; |
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inode->i_ctime = inode->i_mtime = current_time(inode); |
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mark_inode_dirty(inode); |
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if (!IS_SYNC(inode)) |
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return 0; |
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err = filemap_fdatawrite_range(mapping, start, start + count - 1); |
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err2 = sync_mapping_buffers(mapping); |
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if (!err) |
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err = err2; |
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err2 = write_inode_now(inode, 1); |
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if (!err) |
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err = err2; |
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if (err) |
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return err; |
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return filemap_fdatawait_range(mapping, start, start + count - 1); |
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} |
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static bool exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode) |
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{ |
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mode_t allow_utime = sbi->options.allow_utime; |
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if (!uid_eq(current_fsuid(), inode->i_uid)) { |
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if (in_group_p(inode->i_gid)) |
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allow_utime >>= 3; |
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if (allow_utime & MAY_WRITE) |
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return true; |
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} |
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/* use a default check */ |
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return false; |
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} |
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static int exfat_sanitize_mode(const struct exfat_sb_info *sbi, |
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struct inode *inode, umode_t *mode_ptr) |
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{ |
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mode_t i_mode, mask, perm; |
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i_mode = inode->i_mode; |
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mask = (S_ISREG(i_mode) || S_ISLNK(i_mode)) ? |
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sbi->options.fs_fmask : sbi->options.fs_dmask; |
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perm = *mode_ptr & ~(S_IFMT | mask); |
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/* Of the r and x bits, all (subject to umask) must be present.*/ |
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if ((perm & 0555) != (i_mode & 0555)) |
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return -EPERM; |
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if (exfat_mode_can_hold_ro(inode)) { |
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/* |
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* Of the w bits, either all (subject to umask) or none must |
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* be present. |
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*/ |
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if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask))) |
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return -EPERM; |
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} else { |
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/* |
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* If exfat_mode_can_hold_ro(inode) is false, can't change |
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* w bits. |
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*/ |
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if ((perm & 0222) != (0222 & ~mask)) |
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return -EPERM; |
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} |
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*mode_ptr &= S_IFMT | perm; |
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return 0; |
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} |
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/* resize the file length */ |
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int __exfat_truncate(struct inode *inode, loff_t new_size) |
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{ |
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unsigned int num_clusters_new, num_clusters_phys; |
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unsigned int last_clu = EXFAT_FREE_CLUSTER; |
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struct exfat_chain 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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int evict = (ei->dir.dir == DIR_DELETED) ? 1 : 0; |
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/* check if the given file ID is opened */ |
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if (ei->type != TYPE_FILE && ei->type != TYPE_DIR) |
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return -EPERM; |
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exfat_set_volume_dirty(sb); |
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num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi); |
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num_clusters_phys = |
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EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk, sbi); |
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exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags); |
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if (new_size > 0) { |
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/* |
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* Truncate FAT chain num_clusters after the first cluster |
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* num_clusters = min(new, phys); |
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*/ |
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unsigned int num_clusters = |
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min(num_clusters_new, num_clusters_phys); |
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/* |
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* Follow FAT chain |
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* (defensive coding - works fine even with corrupted FAT table |
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*/ |
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if (clu.flags == ALLOC_NO_FAT_CHAIN) { |
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clu.dir += num_clusters; |
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clu.size -= num_clusters; |
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} else { |
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while (num_clusters > 0) { |
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last_clu = clu.dir; |
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if (exfat_get_next_cluster(sb, &(clu.dir))) |
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return -EIO; |
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num_clusters--; |
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clu.size--; |
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} |
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} |
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} else { |
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ei->flags = ALLOC_NO_FAT_CHAIN; |
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ei->start_clu = EXFAT_EOF_CLUSTER; |
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} |
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i_size_write(inode, new_size); |
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if (ei->type == TYPE_FILE) |
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ei->attr |= ATTR_ARCHIVE; |
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/* update the directory entry */ |
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if (!evict) { |
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struct timespec64 ts; |
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struct exfat_dentry *ep, *ep2; |
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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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ep = exfat_get_dentry_cached(es, 0); |
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ep2 = exfat_get_dentry_cached(es, 1); |
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ts = current_time(inode); |
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exfat_set_entry_time(sbi, &ts, |
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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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ep->dentry.file.attr = cpu_to_le16(ei->attr); |
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/* File size should be zero if there is no cluster allocated */ |
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if (ei->start_clu == EXFAT_EOF_CLUSTER) { |
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ep2->dentry.stream.valid_size = 0; |
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ep2->dentry.stream.size = 0; |
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} else { |
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ep2->dentry.stream.valid_size = cpu_to_le64(new_size); |
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ep2->dentry.stream.size = ep2->dentry.stream.valid_size; |
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} |
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if (new_size == 0) { |
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/* Any directory can not be truncated to zero */ |
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WARN_ON(ei->type != TYPE_FILE); |
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ep2->dentry.stream.flags = ALLOC_FAT_CHAIN; |
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ep2->dentry.stream.start_clu = EXFAT_FREE_CLUSTER; |
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} |
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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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} |
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/* cut off from the FAT chain */ |
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if (ei->flags == ALLOC_FAT_CHAIN && last_clu != EXFAT_FREE_CLUSTER && |
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last_clu != EXFAT_EOF_CLUSTER) { |
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if (exfat_ent_set(sb, last_clu, EXFAT_EOF_CLUSTER)) |
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return -EIO; |
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} |
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/* invalidate cache and free the clusters */ |
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/* clear exfat cache */ |
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exfat_cache_inval_inode(inode); |
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/* hint information */ |
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ei->hint_bmap.off = EXFAT_EOF_CLUSTER; |
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ei->hint_bmap.clu = EXFAT_EOF_CLUSTER; |
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/* hint_stat will be used if this is directory. */ |
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ei->hint_stat.eidx = 0; |
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ei->hint_stat.clu = ei->start_clu; |
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ei->hint_femp.eidx = EXFAT_HINT_NONE; |
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/* free the clusters */ |
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if (exfat_free_cluster(inode, &clu)) |
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return -EIO; |
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exfat_clear_volume_dirty(sb); |
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return 0; |
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} |
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void exfat_truncate(struct inode *inode, loff_t size) |
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{ |
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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 int blocksize = i_blocksize(inode); |
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loff_t aligned_size; |
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int err; |
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mutex_lock(&sbi->s_lock); |
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if (EXFAT_I(inode)->start_clu == 0) { |
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/* |
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* Empty start_clu != ~0 (not allocated) |
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*/ |
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exfat_fs_error(sb, "tried to truncate zeroed cluster."); |
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goto write_size; |
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} |
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err = __exfat_truncate(inode, i_size_read(inode)); |
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if (err) |
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goto write_size; |
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inode->i_ctime = inode->i_mtime = current_time(inode); |
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if (IS_DIRSYNC(inode)) |
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exfat_sync_inode(inode); |
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else |
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mark_inode_dirty(inode); |
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inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1)) & |
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~(sbi->cluster_size - 1)) >> inode->i_blkbits; |
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write_size: |
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aligned_size = i_size_read(inode); |
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if (aligned_size & (blocksize - 1)) { |
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aligned_size |= (blocksize - 1); |
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aligned_size++; |
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} |
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if (EXFAT_I(inode)->i_size_ondisk > i_size_read(inode)) |
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EXFAT_I(inode)->i_size_ondisk = aligned_size; |
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if (EXFAT_I(inode)->i_size_aligned > i_size_read(inode)) |
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EXFAT_I(inode)->i_size_aligned = aligned_size; |
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mutex_unlock(&sbi->s_lock); |
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} |
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int exfat_getattr(struct user_namespace *mnt_uerns, const struct path *path, |
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struct kstat *stat, unsigned int request_mask, |
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unsigned int query_flags) |
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{ |
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struct inode *inode = d_backing_inode(path->dentry); |
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struct exfat_inode_info *ei = EXFAT_I(inode); |
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generic_fillattr(&init_user_ns, inode, stat); |
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exfat_truncate_atime(&stat->atime); |
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stat->result_mask |= STATX_BTIME; |
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stat->btime.tv_sec = ei->i_crtime.tv_sec; |
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stat->btime.tv_nsec = ei->i_crtime.tv_nsec; |
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stat->blksize = EXFAT_SB(inode->i_sb)->cluster_size; |
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return 0; |
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} |
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int exfat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, |
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struct iattr *attr) |
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{ |
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struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb); |
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struct inode *inode = dentry->d_inode; |
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unsigned int ia_valid; |
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int error; |
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if ((attr->ia_valid & ATTR_SIZE) && |
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attr->ia_size > i_size_read(inode)) { |
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error = exfat_cont_expand(inode, attr->ia_size); |
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if (error || attr->ia_valid == ATTR_SIZE) |
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return error; |
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attr->ia_valid &= ~ATTR_SIZE; |
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} |
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/* Check for setting the inode time. */ |
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ia_valid = attr->ia_valid; |
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if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) && |
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exfat_allow_set_time(sbi, inode)) { |
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attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET | |
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ATTR_TIMES_SET); |
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} |
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error = setattr_prepare(&init_user_ns, dentry, attr); |
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attr->ia_valid = ia_valid; |
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if (error) |
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goto out; |
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if (((attr->ia_valid & ATTR_UID) && |
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!uid_eq(attr->ia_uid, sbi->options.fs_uid)) || |
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((attr->ia_valid & ATTR_GID) && |
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!gid_eq(attr->ia_gid, sbi->options.fs_gid)) || |
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((attr->ia_valid & ATTR_MODE) && |
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(attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) { |
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error = -EPERM; |
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goto out; |
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} |
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/* |
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* We don't return -EPERM here. Yes, strange, but this is too |
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* old behavior. |
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*/ |
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if (attr->ia_valid & ATTR_MODE) { |
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if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0) |
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attr->ia_valid &= ~ATTR_MODE; |
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} |
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if (attr->ia_valid & ATTR_SIZE) { |
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error = exfat_block_truncate_page(inode, attr->ia_size); |
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if (error) |
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goto out; |
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down_write(&EXFAT_I(inode)->truncate_lock); |
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truncate_setsize(inode, attr->ia_size); |
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exfat_truncate(inode, attr->ia_size); |
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up_write(&EXFAT_I(inode)->truncate_lock); |
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} |
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setattr_copy(&init_user_ns, inode, attr); |
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exfat_truncate_atime(&inode->i_atime); |
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mark_inode_dirty(inode); |
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out: |
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return error; |
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} |
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static int exfat_ioctl_fitrim(struct inode *inode, unsigned long arg) |
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{ |
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struct request_queue *q = bdev_get_queue(inode->i_sb->s_bdev); |
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struct fstrim_range range; |
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int ret = 0; |
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if (!capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
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if (!blk_queue_discard(q)) |
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return -EOPNOTSUPP; |
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if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) |
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return -EFAULT; |
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range.minlen = max_t(unsigned int, range.minlen, |
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q->limits.discard_granularity); |
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ret = exfat_trim_fs(inode, &range); |
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if (ret < 0) |
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return ret; |
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if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range))) |
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return -EFAULT; |
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return 0; |
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} |
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long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
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{ |
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struct inode *inode = file_inode(filp); |
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switch (cmd) { |
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case FITRIM: |
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return exfat_ioctl_fitrim(inode, arg); |
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default: |
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return -ENOTTY; |
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} |
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} |
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#ifdef CONFIG_COMPAT |
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long exfat_compat_ioctl(struct file *filp, unsigned int cmd, |
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unsigned long arg) |
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{ |
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return exfat_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); |
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} |
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#endif |
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int exfat_file_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
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{ |
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struct inode *inode = filp->f_mapping->host; |
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int err; |
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err = __generic_file_fsync(filp, start, end, datasync); |
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if (err) |
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return err; |
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err = sync_blockdev(inode->i_sb->s_bdev); |
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if (err) |
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return err; |
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return blkdev_issue_flush(inode->i_sb->s_bdev); |
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} |
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const struct file_operations exfat_file_operations = { |
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.llseek = generic_file_llseek, |
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.read_iter = generic_file_read_iter, |
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.write_iter = generic_file_write_iter, |
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.unlocked_ioctl = exfat_ioctl, |
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#ifdef CONFIG_COMPAT |
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.compat_ioctl = exfat_compat_ioctl, |
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#endif |
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.mmap = generic_file_mmap, |
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.fsync = exfat_file_fsync, |
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.splice_read = generic_file_splice_read, |
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.splice_write = iter_file_splice_write, |
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}; |
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const struct inode_operations exfat_file_inode_operations = { |
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.setattr = exfat_setattr, |
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.getattr = exfat_getattr, |
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};
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