401 строка
9.9 KiB
C
401 строка
9.9 KiB
C
// 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)
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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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/* 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 = EXFAT_B_TO_CLU_ROUND_UP(ei->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 (i_size_read(inode) > 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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if (ei->type == TYPE_FILE)
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ei->attr |= ATTR_ARCHIVE;
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/*
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* update the directory entry
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*
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* If the directory entry is updated by mark_inode_dirty(), the
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* directory entry will be written after a writeback cycle of
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* updating the bitmap/FAT, which may result in clusters being
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* freed but referenced by the directory entry in the event of a
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* sudden power failure.
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* __exfat_write_inode() is called for directory entry, bitmap
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* and FAT to be written in a same writeback.
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*/
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if (__exfat_write_inode(inode, inode_needs_sync(inode)))
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return -EIO;
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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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return 0;
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}
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void exfat_truncate(struct inode *inode)
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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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struct exfat_inode_info *ei = EXFAT_I(inode);
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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 (ei->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);
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if (err)
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goto write_size;
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inode->i_blocks = round_up(i_size_read(inode), sbi->cluster_size) >>
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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 (ei->i_size_ondisk > i_size_read(inode))
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ei->i_size_ondisk = aligned_size;
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if (ei->i_size_aligned > i_size_read(inode))
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ei->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 mnt_idmap *idmap, 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(&nop_mnt_idmap, 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 mnt_idmap *idmap, 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(&nop_mnt_idmap, 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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inode->i_mtime = inode->i_ctime = current_time(inode);
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setattr_copy(&nop_mnt_idmap, inode, attr);
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exfat_truncate_atime(&inode->i_atime);
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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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/*
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* __exfat_write_inode() is called from exfat_truncate(), inode
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* is already written by it, so mark_inode_dirty() is unneeded.
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*/
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exfat_truncate(inode);
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up_write(&EXFAT_I(inode)->truncate_lock);
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} else
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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 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 (!bdev_max_discard_sectors(inode->i_sb->s_bdev))
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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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bdev_discard_granularity(inode->i_sb->s_bdev));
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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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