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![Jeremy Bongio](/assets/img/avatar_default.png)
This fixes a race between changing the ext4 superblock uuid and operations like mounting, resizing, changing features, etc. Reviewed-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Jeremy Bongio <bongiojp@gmail.com> Link: https://lore.kernel.org/r/20220721224422.438351-1-bongiojp@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1702 lines
42 KiB
C
1702 lines
42 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/ext4/ioctl.c
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*
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* Copyright (C) 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*/
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#include <linux/fs.h>
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#include <linux/capability.h>
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#include <linux/time.h>
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#include <linux/compat.h>
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#include <linux/mount.h>
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#include <linux/file.h>
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#include <linux/quotaops.h>
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#include <linux/random.h>
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#include <linux/uaccess.h>
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#include <linux/delay.h>
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#include <linux/iversion.h>
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#include <linux/fileattr.h>
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#include <linux/uuid.h>
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#include "ext4_jbd2.h"
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#include "ext4.h"
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#include <linux/fsmap.h>
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#include "fsmap.h"
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#include <trace/events/ext4.h>
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typedef void ext4_update_sb_callback(struct ext4_super_block *es,
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const void *arg);
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/*
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* Superblock modification callback function for changing file system
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* label
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*/
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static void ext4_sb_setlabel(struct ext4_super_block *es, const void *arg)
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{
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/* Sanity check, this should never happen */
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BUILD_BUG_ON(sizeof(es->s_volume_name) < EXT4_LABEL_MAX);
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memcpy(es->s_volume_name, (char *)arg, EXT4_LABEL_MAX);
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}
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/*
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* Superblock modification callback function for changing file system
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* UUID.
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*/
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static void ext4_sb_setuuid(struct ext4_super_block *es, const void *arg)
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{
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memcpy(es->s_uuid, (__u8 *)arg, UUID_SIZE);
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}
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static
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int ext4_update_primary_sb(struct super_block *sb, handle_t *handle,
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ext4_update_sb_callback func,
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const void *arg)
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{
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int err = 0;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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struct buffer_head *bh = sbi->s_sbh;
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struct ext4_super_block *es = sbi->s_es;
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trace_ext4_update_sb(sb, bh->b_blocknr, 1);
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BUFFER_TRACE(bh, "get_write_access");
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err = ext4_journal_get_write_access(handle, sb,
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bh,
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EXT4_JTR_NONE);
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if (err)
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goto out_err;
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lock_buffer(bh);
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func(es, arg);
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ext4_superblock_csum_set(sb);
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unlock_buffer(bh);
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if (buffer_write_io_error(bh) || !buffer_uptodate(bh)) {
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ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
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"superblock detected");
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clear_buffer_write_io_error(bh);
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set_buffer_uptodate(bh);
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}
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err = ext4_handle_dirty_metadata(handle, NULL, bh);
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if (err)
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goto out_err;
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err = sync_dirty_buffer(bh);
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out_err:
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ext4_std_error(sb, err);
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return err;
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}
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/*
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* Update one backup superblock in the group 'grp' using the callback
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* function 'func' and argument 'arg'. If the handle is NULL the
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* modification is not journalled.
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*
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* Returns: 0 when no modification was done (no superblock in the group)
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* 1 when the modification was successful
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* <0 on error
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*/
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static int ext4_update_backup_sb(struct super_block *sb,
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handle_t *handle, ext4_group_t grp,
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ext4_update_sb_callback func, const void *arg)
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{
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int err = 0;
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ext4_fsblk_t sb_block;
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struct buffer_head *bh;
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unsigned long offset = 0;
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struct ext4_super_block *es;
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if (!ext4_bg_has_super(sb, grp))
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return 0;
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/*
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* For the group 0 there is always 1k padding, so we have
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* either adjust offset, or sb_block depending on blocksize
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*/
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if (grp == 0) {
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sb_block = 1 * EXT4_MIN_BLOCK_SIZE;
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offset = do_div(sb_block, sb->s_blocksize);
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} else {
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sb_block = ext4_group_first_block_no(sb, grp);
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offset = 0;
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}
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trace_ext4_update_sb(sb, sb_block, handle ? 1 : 0);
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bh = ext4_sb_bread(sb, sb_block, 0);
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if (IS_ERR(bh))
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return PTR_ERR(bh);
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if (handle) {
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BUFFER_TRACE(bh, "get_write_access");
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err = ext4_journal_get_write_access(handle, sb,
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bh,
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EXT4_JTR_NONE);
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if (err)
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goto out_bh;
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}
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es = (struct ext4_super_block *) (bh->b_data + offset);
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lock_buffer(bh);
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if (ext4_has_metadata_csum(sb) &&
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es->s_checksum != ext4_superblock_csum(sb, es)) {
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ext4_msg(sb, KERN_ERR, "Invalid checksum for backup "
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"superblock %llu\n", sb_block);
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unlock_buffer(bh);
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err = -EFSBADCRC;
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goto out_bh;
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}
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func(es, arg);
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if (ext4_has_metadata_csum(sb))
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es->s_checksum = ext4_superblock_csum(sb, es);
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set_buffer_uptodate(bh);
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unlock_buffer(bh);
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if (err)
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goto out_bh;
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if (handle) {
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err = ext4_handle_dirty_metadata(handle, NULL, bh);
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if (err)
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goto out_bh;
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} else {
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BUFFER_TRACE(bh, "marking dirty");
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mark_buffer_dirty(bh);
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}
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err = sync_dirty_buffer(bh);
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out_bh:
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brelse(bh);
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ext4_std_error(sb, err);
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return (err) ? err : 1;
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}
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/*
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* Update primary and backup superblocks using the provided function
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* func and argument arg.
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*
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* Only the primary superblock and at most two backup superblock
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* modifications are journalled; the rest is modified without journal.
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* This is safe because e2fsck will re-write them if there is a problem,
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* and we're very unlikely to ever need more than two backups.
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*/
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static
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int ext4_update_superblocks_fn(struct super_block *sb,
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ext4_update_sb_callback func,
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const void *arg)
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{
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handle_t *handle;
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ext4_group_t ngroups;
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unsigned int three = 1;
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unsigned int five = 5;
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unsigned int seven = 7;
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int err = 0, ret, i;
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ext4_group_t grp, primary_grp;
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struct ext4_sb_info *sbi = EXT4_SB(sb);
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/*
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* We can't update superblocks while the online resize is running
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*/
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if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
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&sbi->s_ext4_flags)) {
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ext4_msg(sb, KERN_ERR, "Can't modify superblock while"
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"performing online resize");
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return -EBUSY;
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}
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/*
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* We're only going to update primary superblock and two
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* backup superblocks in this transaction.
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*/
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handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3);
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if (IS_ERR(handle)) {
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err = PTR_ERR(handle);
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goto out;
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}
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/* Update primary superblock */
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err = ext4_update_primary_sb(sb, handle, func, arg);
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if (err) {
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ext4_msg(sb, KERN_ERR, "Failed to update primary "
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"superblock");
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goto out_journal;
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}
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primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr);
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ngroups = ext4_get_groups_count(sb);
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/*
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* Update backup superblocks. We have to start from group 0
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* because it might not be where the primary superblock is
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* if the fs is mounted with -o sb=<backup_sb_block>
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*/
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i = 0;
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grp = 0;
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while (grp < ngroups) {
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/* Skip primary superblock */
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if (grp == primary_grp)
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goto next_grp;
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ret = ext4_update_backup_sb(sb, handle, grp, func, arg);
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if (ret < 0) {
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/* Ignore bad checksum; try to update next sb */
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if (ret == -EFSBADCRC)
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goto next_grp;
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err = ret;
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goto out_journal;
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}
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i += ret;
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if (handle && i > 1) {
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/*
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* We're only journalling primary superblock and
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* two backup superblocks; the rest is not
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* journalled.
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*/
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err = ext4_journal_stop(handle);
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if (err)
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goto out;
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handle = NULL;
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}
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next_grp:
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grp = ext4_list_backups(sb, &three, &five, &seven);
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}
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out_journal:
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if (handle) {
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ret = ext4_journal_stop(handle);
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if (ret && !err)
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err = ret;
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}
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out:
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clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags);
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smp_mb__after_atomic();
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return err ? err : 0;
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}
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/*
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* Swap memory between @a and @b for @len bytes.
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*
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* @a: pointer to first memory area
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* @b: pointer to second memory area
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* @len: number of bytes to swap
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*
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*/
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static void memswap(void *a, void *b, size_t len)
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{
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unsigned char *ap, *bp;
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ap = (unsigned char *)a;
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bp = (unsigned char *)b;
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while (len-- > 0) {
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swap(*ap, *bp);
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ap++;
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bp++;
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}
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}
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/*
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* Swap i_data and associated attributes between @inode1 and @inode2.
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* This function is used for the primary swap between inode1 and inode2
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* and also to revert this primary swap in case of errors.
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*
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* Therefore you have to make sure, that calling this method twice
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* will revert all changes.
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*
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* @inode1: pointer to first inode
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* @inode2: pointer to second inode
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*/
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static void swap_inode_data(struct inode *inode1, struct inode *inode2)
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{
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loff_t isize;
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struct ext4_inode_info *ei1;
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struct ext4_inode_info *ei2;
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unsigned long tmp;
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ei1 = EXT4_I(inode1);
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ei2 = EXT4_I(inode2);
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swap(inode1->i_version, inode2->i_version);
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swap(inode1->i_atime, inode2->i_atime);
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swap(inode1->i_mtime, inode2->i_mtime);
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memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
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tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
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ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
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(ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
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ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
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swap(ei1->i_disksize, ei2->i_disksize);
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ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
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ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
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isize = i_size_read(inode1);
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i_size_write(inode1, i_size_read(inode2));
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i_size_write(inode2, isize);
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}
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void ext4_reset_inode_seed(struct inode *inode)
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{
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struct ext4_inode_info *ei = EXT4_I(inode);
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struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
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__le32 inum = cpu_to_le32(inode->i_ino);
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__le32 gen = cpu_to_le32(inode->i_generation);
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__u32 csum;
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if (!ext4_has_metadata_csum(inode->i_sb))
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return;
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csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
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ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
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}
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|
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/*
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* Swap the information from the given @inode and the inode
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* EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
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* important fields of the inodes.
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*
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* @sb: the super block of the filesystem
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* @mnt_userns: user namespace of the mount the inode was found from
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* @inode: the inode to swap with EXT4_BOOT_LOADER_INO
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*
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*/
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static long swap_inode_boot_loader(struct super_block *sb,
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struct user_namespace *mnt_userns,
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struct inode *inode)
|
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{
|
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handle_t *handle;
|
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int err;
|
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struct inode *inode_bl;
|
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struct ext4_inode_info *ei_bl;
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qsize_t size, size_bl, diff;
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blkcnt_t blocks;
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unsigned short bytes;
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|
|
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inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
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if (IS_ERR(inode_bl))
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return PTR_ERR(inode_bl);
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ei_bl = EXT4_I(inode_bl);
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|
|
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/* Protect orig inodes against a truncate and make sure,
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* that only 1 swap_inode_boot_loader is running. */
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lock_two_nondirectories(inode, inode_bl);
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|
|
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if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
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IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
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(EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
|
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ext4_has_inline_data(inode)) {
|
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err = -EINVAL;
|
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goto journal_err_out;
|
|
}
|
|
|
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if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
|
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!inode_owner_or_capable(mnt_userns, inode) ||
|
|
!capable(CAP_SYS_ADMIN)) {
|
|
err = -EPERM;
|
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goto journal_err_out;
|
|
}
|
|
|
|
filemap_invalidate_lock(inode->i_mapping);
|
|
err = filemap_write_and_wait(inode->i_mapping);
|
|
if (err)
|
|
goto err_out;
|
|
|
|
err = filemap_write_and_wait(inode_bl->i_mapping);
|
|
if (err)
|
|
goto err_out;
|
|
|
|
/* Wait for all existing dio workers */
|
|
inode_dio_wait(inode);
|
|
inode_dio_wait(inode_bl);
|
|
|
|
truncate_inode_pages(&inode->i_data, 0);
|
|
truncate_inode_pages(&inode_bl->i_data, 0);
|
|
|
|
handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
|
|
if (IS_ERR(handle)) {
|
|
err = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle);
|
|
|
|
/* Protect extent tree against block allocations via delalloc */
|
|
ext4_double_down_write_data_sem(inode, inode_bl);
|
|
|
|
if (inode_bl->i_nlink == 0) {
|
|
/* this inode has never been used as a BOOT_LOADER */
|
|
set_nlink(inode_bl, 1);
|
|
i_uid_write(inode_bl, 0);
|
|
i_gid_write(inode_bl, 0);
|
|
inode_bl->i_flags = 0;
|
|
ei_bl->i_flags = 0;
|
|
inode_set_iversion(inode_bl, 1);
|
|
i_size_write(inode_bl, 0);
|
|
inode_bl->i_mode = S_IFREG;
|
|
if (ext4_has_feature_extents(sb)) {
|
|
ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
|
|
ext4_ext_tree_init(handle, inode_bl);
|
|
} else
|
|
memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
|
|
}
|
|
|
|
err = dquot_initialize(inode);
|
|
if (err)
|
|
goto err_out1;
|
|
|
|
size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
|
|
size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
|
|
diff = size - size_bl;
|
|
swap_inode_data(inode, inode_bl);
|
|
|
|
inode->i_ctime = inode_bl->i_ctime = current_time(inode);
|
|
|
|
inode->i_generation = prandom_u32();
|
|
inode_bl->i_generation = prandom_u32();
|
|
ext4_reset_inode_seed(inode);
|
|
ext4_reset_inode_seed(inode_bl);
|
|
|
|
ext4_discard_preallocations(inode, 0);
|
|
|
|
err = ext4_mark_inode_dirty(handle, inode);
|
|
if (err < 0) {
|
|
/* No need to update quota information. */
|
|
ext4_warning(inode->i_sb,
|
|
"couldn't mark inode #%lu dirty (err %d)",
|
|
inode->i_ino, err);
|
|
/* Revert all changes: */
|
|
swap_inode_data(inode, inode_bl);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
goto err_out1;
|
|
}
|
|
|
|
blocks = inode_bl->i_blocks;
|
|
bytes = inode_bl->i_bytes;
|
|
inode_bl->i_blocks = inode->i_blocks;
|
|
inode_bl->i_bytes = inode->i_bytes;
|
|
err = ext4_mark_inode_dirty(handle, inode_bl);
|
|
if (err < 0) {
|
|
/* No need to update quota information. */
|
|
ext4_warning(inode_bl->i_sb,
|
|
"couldn't mark inode #%lu dirty (err %d)",
|
|
inode_bl->i_ino, err);
|
|
goto revert;
|
|
}
|
|
|
|
/* Bootloader inode should not be counted into quota information. */
|
|
if (diff > 0)
|
|
dquot_free_space(inode, diff);
|
|
else
|
|
err = dquot_alloc_space(inode, -1 * diff);
|
|
|
|
if (err < 0) {
|
|
revert:
|
|
/* Revert all changes: */
|
|
inode_bl->i_blocks = blocks;
|
|
inode_bl->i_bytes = bytes;
|
|
swap_inode_data(inode, inode_bl);
|
|
ext4_mark_inode_dirty(handle, inode);
|
|
ext4_mark_inode_dirty(handle, inode_bl);
|
|
}
|
|
|
|
err_out1:
|
|
ext4_journal_stop(handle);
|
|
ext4_double_up_write_data_sem(inode, inode_bl);
|
|
|
|
err_out:
|
|
filemap_invalidate_unlock(inode->i_mapping);
|
|
journal_err_out:
|
|
unlock_two_nondirectories(inode, inode_bl);
|
|
iput(inode_bl);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* If immutable is set and we are not clearing it, we're not allowed to change
|
|
* anything else in the inode. Don't error out if we're only trying to set
|
|
* immutable on an immutable file.
|
|
*/
|
|
static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
|
|
unsigned int flags)
|
|
{
|
|
struct ext4_inode_info *ei = EXT4_I(inode);
|
|
unsigned int oldflags = ei->i_flags;
|
|
|
|
if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
|
|
return 0;
|
|
|
|
if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
|
|
return -EPERM;
|
|
if (ext4_has_feature_project(inode->i_sb) &&
|
|
__kprojid_val(ei->i_projid) != new_projid)
|
|
return -EPERM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
|
|
{
|
|
struct ext4_inode_info *ei = EXT4_I(inode);
|
|
|
|
if (S_ISDIR(inode->i_mode))
|
|
return;
|
|
|
|
if (test_opt2(inode->i_sb, DAX_NEVER) ||
|
|
test_opt(inode->i_sb, DAX_ALWAYS))
|
|
return;
|
|
|
|
if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
|
|
d_mark_dontcache(inode);
|
|
}
|
|
|
|
static bool dax_compatible(struct inode *inode, unsigned int oldflags,
|
|
unsigned int flags)
|
|
{
|
|
/* Allow the DAX flag to be changed on inline directories */
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
flags &= ~EXT4_INLINE_DATA_FL;
|
|
oldflags &= ~EXT4_INLINE_DATA_FL;
|
|
}
|
|
|
|
if (flags & EXT4_DAX_FL) {
|
|
if ((oldflags & EXT4_DAX_MUT_EXCL) ||
|
|
ext4_test_inode_state(inode,
|
|
EXT4_STATE_VERITY_IN_PROGRESS)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int ext4_ioctl_setflags(struct inode *inode,
|
|
unsigned int flags)
|
|
{
|
|
struct ext4_inode_info *ei = EXT4_I(inode);
|
|
handle_t *handle = NULL;
|
|
int err = -EPERM, migrate = 0;
|
|
struct ext4_iloc iloc;
|
|
unsigned int oldflags, mask, i;
|
|
struct super_block *sb = inode->i_sb;
|
|
|
|
/* Is it quota file? Do not allow user to mess with it */
|
|
if (ext4_is_quota_file(inode))
|
|
goto flags_out;
|
|
|
|
oldflags = ei->i_flags;
|
|
/*
|
|
* The JOURNAL_DATA flag can only be changed by
|
|
* the relevant capability.
|
|
*/
|
|
if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
|
|
if (!capable(CAP_SYS_RESOURCE))
|
|
goto flags_out;
|
|
}
|
|
|
|
if (!dax_compatible(inode, oldflags, flags)) {
|
|
err = -EOPNOTSUPP;
|
|
goto flags_out;
|
|
}
|
|
|
|
if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
|
|
migrate = 1;
|
|
|
|
if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
|
|
if (!ext4_has_feature_casefold(sb)) {
|
|
err = -EOPNOTSUPP;
|
|
goto flags_out;
|
|
}
|
|
|
|
if (!S_ISDIR(inode->i_mode)) {
|
|
err = -ENOTDIR;
|
|
goto flags_out;
|
|
}
|
|
|
|
if (!ext4_empty_dir(inode)) {
|
|
err = -ENOTEMPTY;
|
|
goto flags_out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wait for all pending directio and then flush all the dirty pages
|
|
* for this file. The flush marks all the pages readonly, so any
|
|
* subsequent attempt to write to the file (particularly mmap pages)
|
|
* will come through the filesystem and fail.
|
|
*/
|
|
if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
|
|
(flags & EXT4_IMMUTABLE_FL)) {
|
|
inode_dio_wait(inode);
|
|
err = filemap_write_and_wait(inode->i_mapping);
|
|
if (err)
|
|
goto flags_out;
|
|
}
|
|
|
|
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
|
|
if (IS_ERR(handle)) {
|
|
err = PTR_ERR(handle);
|
|
goto flags_out;
|
|
}
|
|
if (IS_SYNC(inode))
|
|
ext4_handle_sync(handle);
|
|
err = ext4_reserve_inode_write(handle, inode, &iloc);
|
|
if (err)
|
|
goto flags_err;
|
|
|
|
ext4_dax_dontcache(inode, flags);
|
|
|
|
for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
|
|
if (!(mask & EXT4_FL_USER_MODIFIABLE))
|
|
continue;
|
|
/* These flags get special treatment later */
|
|
if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
|
|
continue;
|
|
if (mask & flags)
|
|
ext4_set_inode_flag(inode, i);
|
|
else
|
|
ext4_clear_inode_flag(inode, i);
|
|
}
|
|
|
|
ext4_set_inode_flags(inode, false);
|
|
|
|
inode->i_ctime = current_time(inode);
|
|
|
|
err = ext4_mark_iloc_dirty(handle, inode, &iloc);
|
|
flags_err:
|
|
ext4_journal_stop(handle);
|
|
if (err)
|
|
goto flags_out;
|
|
|
|
if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
|
|
/*
|
|
* Changes to the journaling mode can cause unsafe changes to
|
|
* S_DAX if the inode is DAX
|
|
*/
|
|
if (IS_DAX(inode)) {
|
|
err = -EBUSY;
|
|
goto flags_out;
|
|
}
|
|
|
|
err = ext4_change_inode_journal_flag(inode,
|
|
flags & EXT4_JOURNAL_DATA_FL);
|
|
if (err)
|
|
goto flags_out;
|
|
}
|
|
if (migrate) {
|
|
if (flags & EXT4_EXTENTS_FL)
|
|
err = ext4_ext_migrate(inode);
|
|
else
|
|
err = ext4_ind_migrate(inode);
|
|
}
|
|
|
|
flags_out:
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct ext4_inode_info *ei = EXT4_I(inode);
|
|
int err, rc;
|
|
handle_t *handle;
|
|
kprojid_t kprojid;
|
|
struct ext4_iloc iloc;
|
|
struct ext4_inode *raw_inode;
|
|
struct dquot *transfer_to[MAXQUOTAS] = { };
|
|
|
|
if (!ext4_has_feature_project(sb)) {
|
|
if (projid != EXT4_DEF_PROJID)
|
|
return -EOPNOTSUPP;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
|
|
return -EOPNOTSUPP;
|
|
|
|
kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
|
|
|
|
if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
|
|
return 0;
|
|
|
|
err = -EPERM;
|
|
/* Is it quota file? Do not allow user to mess with it */
|
|
if (ext4_is_quota_file(inode))
|
|
return err;
|
|
|
|
err = ext4_get_inode_loc(inode, &iloc);
|
|
if (err)
|
|
return err;
|
|
|
|
raw_inode = ext4_raw_inode(&iloc);
|
|
if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
|
|
err = ext4_expand_extra_isize(inode,
|
|
EXT4_SB(sb)->s_want_extra_isize,
|
|
&iloc);
|
|
if (err)
|
|
return err;
|
|
} else {
|
|
brelse(iloc.bh);
|
|
}
|
|
|
|
err = dquot_initialize(inode);
|
|
if (err)
|
|
return err;
|
|
|
|
handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
|
|
EXT4_QUOTA_INIT_BLOCKS(sb) +
|
|
EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
err = ext4_reserve_inode_write(handle, inode, &iloc);
|
|
if (err)
|
|
goto out_stop;
|
|
|
|
transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
|
|
if (!IS_ERR(transfer_to[PRJQUOTA])) {
|
|
|
|
/* __dquot_transfer() calls back ext4_get_inode_usage() which
|
|
* counts xattr inode references.
|
|
*/
|
|
down_read(&EXT4_I(inode)->xattr_sem);
|
|
err = __dquot_transfer(inode, transfer_to);
|
|
up_read(&EXT4_I(inode)->xattr_sem);
|
|
dqput(transfer_to[PRJQUOTA]);
|
|
if (err)
|
|
goto out_dirty;
|
|
}
|
|
|
|
EXT4_I(inode)->i_projid = kprojid;
|
|
inode->i_ctime = current_time(inode);
|
|
out_dirty:
|
|
rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
|
|
if (!err)
|
|
err = rc;
|
|
out_stop:
|
|
ext4_journal_stop(handle);
|
|
return err;
|
|
}
|
|
#else
|
|
static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
|
|
{
|
|
if (projid != EXT4_DEF_PROJID)
|
|
return -EOPNOTSUPP;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int ext4_shutdown(struct super_block *sb, unsigned long arg)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
__u32 flags;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (get_user(flags, (__u32 __user *)arg))
|
|
return -EFAULT;
|
|
|
|
if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
|
|
return -EINVAL;
|
|
|
|
if (ext4_forced_shutdown(sbi))
|
|
return 0;
|
|
|
|
ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
|
|
trace_ext4_shutdown(sb, flags);
|
|
|
|
switch (flags) {
|
|
case EXT4_GOING_FLAGS_DEFAULT:
|
|
freeze_bdev(sb->s_bdev);
|
|
set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
|
|
thaw_bdev(sb->s_bdev);
|
|
break;
|
|
case EXT4_GOING_FLAGS_LOGFLUSH:
|
|
set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
|
|
if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
|
|
(void) ext4_force_commit(sb);
|
|
jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
|
|
}
|
|
break;
|
|
case EXT4_GOING_FLAGS_NOLOGFLUSH:
|
|
set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
|
|
if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
|
|
jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
clear_opt(sb, DISCARD);
|
|
return 0;
|
|
}
|
|
|
|
struct getfsmap_info {
|
|
struct super_block *gi_sb;
|
|
struct fsmap_head __user *gi_data;
|
|
unsigned int gi_idx;
|
|
__u32 gi_last_flags;
|
|
};
|
|
|
|
static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
|
|
{
|
|
struct getfsmap_info *info = priv;
|
|
struct fsmap fm;
|
|
|
|
trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
|
|
|
|
info->gi_last_flags = xfm->fmr_flags;
|
|
ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
|
|
if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
|
|
sizeof(struct fsmap)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ext4_ioc_getfsmap(struct super_block *sb,
|
|
struct fsmap_head __user *arg)
|
|
{
|
|
struct getfsmap_info info = { NULL };
|
|
struct ext4_fsmap_head xhead = {0};
|
|
struct fsmap_head head;
|
|
bool aborted = false;
|
|
int error;
|
|
|
|
if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
|
|
return -EFAULT;
|
|
if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
|
|
memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
|
|
sizeof(head.fmh_keys[0].fmr_reserved)) ||
|
|
memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
|
|
sizeof(head.fmh_keys[1].fmr_reserved)))
|
|
return -EINVAL;
|
|
/*
|
|
* ext4 doesn't report file extents at all, so the only valid
|
|
* file offsets are the magic ones (all zeroes or all ones).
|
|
*/
|
|
if (head.fmh_keys[0].fmr_offset ||
|
|
(head.fmh_keys[1].fmr_offset != 0 &&
|
|
head.fmh_keys[1].fmr_offset != -1ULL))
|
|
return -EINVAL;
|
|
|
|
xhead.fmh_iflags = head.fmh_iflags;
|
|
xhead.fmh_count = head.fmh_count;
|
|
ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
|
|
ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
|
|
|
|
trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
|
|
trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
|
|
|
|
info.gi_sb = sb;
|
|
info.gi_data = arg;
|
|
error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
|
|
if (error == EXT4_QUERY_RANGE_ABORT)
|
|
aborted = true;
|
|
else if (error)
|
|
return error;
|
|
|
|
/* If we didn't abort, set the "last" flag in the last fmx */
|
|
if (!aborted && info.gi_idx) {
|
|
info.gi_last_flags |= FMR_OF_LAST;
|
|
if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
|
|
&info.gi_last_flags,
|
|
sizeof(info.gi_last_flags)))
|
|
return -EFAULT;
|
|
}
|
|
|
|
/* copy back header */
|
|
head.fmh_entries = xhead.fmh_entries;
|
|
head.fmh_oflags = xhead.fmh_oflags;
|
|
if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long ext4_ioctl_group_add(struct file *file,
|
|
struct ext4_new_group_data *input)
|
|
{
|
|
struct super_block *sb = file_inode(file)->i_sb;
|
|
int err, err2=0;
|
|
|
|
err = ext4_resize_begin(sb);
|
|
if (err)
|
|
return err;
|
|
|
|
if (ext4_has_feature_bigalloc(sb)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Online resizing not supported with bigalloc");
|
|
err = -EOPNOTSUPP;
|
|
goto group_add_out;
|
|
}
|
|
|
|
err = mnt_want_write_file(file);
|
|
if (err)
|
|
goto group_add_out;
|
|
|
|
err = ext4_group_add(sb, input);
|
|
if (EXT4_SB(sb)->s_journal) {
|
|
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
|
|
err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
|
|
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
|
|
}
|
|
if (err == 0)
|
|
err = err2;
|
|
mnt_drop_write_file(file);
|
|
if (!err && ext4_has_group_desc_csum(sb) &&
|
|
test_opt(sb, INIT_INODE_TABLE))
|
|
err = ext4_register_li_request(sb, input->group);
|
|
group_add_out:
|
|
err2 = ext4_resize_end(sb, false);
|
|
if (err == 0)
|
|
err = err2;
|
|
return err;
|
|
}
|
|
|
|
int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct ext4_inode_info *ei = EXT4_I(inode);
|
|
u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
|
|
|
|
if (S_ISREG(inode->i_mode))
|
|
flags &= ~FS_PROJINHERIT_FL;
|
|
|
|
fileattr_fill_flags(fa, flags);
|
|
if (ext4_has_feature_project(inode->i_sb))
|
|
fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ext4_fileattr_set(struct user_namespace *mnt_userns,
|
|
struct dentry *dentry, struct fileattr *fa)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
u32 flags = fa->flags;
|
|
int err = -EOPNOTSUPP;
|
|
|
|
if (flags & ~EXT4_FL_USER_VISIBLE)
|
|
goto out;
|
|
|
|
/*
|
|
* chattr(1) grabs flags via GETFLAGS, modifies the result and
|
|
* passes that to SETFLAGS. So we cannot easily make SETFLAGS
|
|
* more restrictive than just silently masking off visible but
|
|
* not settable flags as we always did.
|
|
*/
|
|
flags &= EXT4_FL_USER_MODIFIABLE;
|
|
if (ext4_mask_flags(inode->i_mode, flags) != flags)
|
|
goto out;
|
|
err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
|
|
if (err)
|
|
goto out;
|
|
err = ext4_ioctl_setflags(inode, flags);
|
|
if (err)
|
|
goto out;
|
|
err = ext4_ioctl_setproject(inode, fa->fsx_projid);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/* So that the fiemap access checks can't overflow on 32 bit machines. */
|
|
#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent))
|
|
|
|
static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
|
|
{
|
|
struct fiemap fiemap;
|
|
struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
|
|
struct fiemap_extent_info fieinfo = { 0, };
|
|
struct inode *inode = file_inode(filp);
|
|
int error;
|
|
|
|
if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
|
|
return -EFAULT;
|
|
|
|
if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
|
|
return -EINVAL;
|
|
|
|
fieinfo.fi_flags = fiemap.fm_flags;
|
|
fieinfo.fi_extents_max = fiemap.fm_extent_count;
|
|
fieinfo.fi_extents_start = ufiemap->fm_extents;
|
|
|
|
error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
|
|
fiemap.fm_length);
|
|
fiemap.fm_flags = fieinfo.fi_flags;
|
|
fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
|
|
if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
|
|
error = -EFAULT;
|
|
|
|
return error;
|
|
}
|
|
|
|
static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
|
|
{
|
|
int err = 0;
|
|
__u32 flags = 0;
|
|
unsigned int flush_flags = 0;
|
|
struct super_block *sb = file_inode(filp)->i_sb;
|
|
|
|
if (copy_from_user(&flags, (__u32 __user *)arg,
|
|
sizeof(__u32)))
|
|
return -EFAULT;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* check for invalid bits set */
|
|
if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
|
|
((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
|
|
(flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
|
|
return -EINVAL;
|
|
|
|
if (!EXT4_SB(sb)->s_journal)
|
|
return -ENODEV;
|
|
|
|
if (flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID)
|
|
return -EINVAL;
|
|
|
|
if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
|
|
!bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
|
|
return 0;
|
|
|
|
if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD)
|
|
flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD;
|
|
|
|
if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) {
|
|
flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT;
|
|
pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow");
|
|
}
|
|
|
|
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
|
|
err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags);
|
|
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label)
|
|
{
|
|
size_t len;
|
|
int ret = 0;
|
|
char new_label[EXT4_LABEL_MAX + 1];
|
|
struct super_block *sb = file_inode(filp)->i_sb;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
/*
|
|
* Copy the maximum length allowed for ext4 label with one more to
|
|
* find the required terminating null byte in order to test the
|
|
* label length. The on disk label doesn't need to be null terminated.
|
|
*/
|
|
if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1))
|
|
return -EFAULT;
|
|
|
|
len = strnlen(new_label, EXT4_LABEL_MAX + 1);
|
|
if (len > EXT4_LABEL_MAX)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Clear the buffer after the new label
|
|
*/
|
|
memset(new_label + len, 0, EXT4_LABEL_MAX - len);
|
|
|
|
ret = mnt_want_write_file(filp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label);
|
|
|
|
mnt_drop_write_file(filp);
|
|
return ret;
|
|
}
|
|
|
|
static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label)
|
|
{
|
|
char label[EXT4_LABEL_MAX + 1];
|
|
|
|
/*
|
|
* EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because
|
|
* FSLABEL_MAX must include terminating null byte, while s_volume_name
|
|
* does not have to.
|
|
*/
|
|
BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX);
|
|
|
|
memset(label, 0, sizeof(label));
|
|
lock_buffer(sbi->s_sbh);
|
|
strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX);
|
|
unlock_buffer(sbi->s_sbh);
|
|
|
|
if (copy_to_user(user_label, label, sizeof(label)))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi,
|
|
struct fsuuid __user *ufsuuid)
|
|
{
|
|
struct fsuuid fsuuid;
|
|
__u8 uuid[UUID_SIZE];
|
|
|
|
if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
|
|
return -EFAULT;
|
|
|
|
if (fsuuid.fsu_len == 0) {
|
|
fsuuid.fsu_len = UUID_SIZE;
|
|
if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid.fsu_len)))
|
|
return -EFAULT;
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
|
|
return -EINVAL;
|
|
|
|
lock_buffer(sbi->s_sbh);
|
|
memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE);
|
|
unlock_buffer(sbi->s_sbh);
|
|
|
|
if (copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int ext4_ioctl_setuuid(struct file *filp,
|
|
const struct fsuuid __user *ufsuuid)
|
|
{
|
|
int ret = 0;
|
|
struct super_block *sb = file_inode(filp)->i_sb;
|
|
struct fsuuid fsuuid;
|
|
__u8 uuid[UUID_SIZE];
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
/*
|
|
* If any checksums (group descriptors or metadata) are being used
|
|
* then the checksum seed feature is required to change the UUID.
|
|
*/
|
|
if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb))
|
|
&& !ext4_has_feature_csum_seed(sb))
|
|
|| ext4_has_feature_stable_inodes(sb))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
|
|
return -EFAULT;
|
|
|
|
if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE))
|
|
return -EFAULT;
|
|
|
|
ret = mnt_want_write_file(filp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid);
|
|
mnt_drop_write_file(filp);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct inode *inode = file_inode(filp);
|
|
struct super_block *sb = inode->i_sb;
|
|
struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
|
|
|
|
ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
|
|
|
|
switch (cmd) {
|
|
case FS_IOC_GETFSMAP:
|
|
return ext4_ioc_getfsmap(sb, (void __user *)arg);
|
|
case EXT4_IOC_GETVERSION:
|
|
case EXT4_IOC_GETVERSION_OLD:
|
|
return put_user(inode->i_generation, (int __user *) arg);
|
|
case EXT4_IOC_SETVERSION:
|
|
case EXT4_IOC_SETVERSION_OLD: {
|
|
handle_t *handle;
|
|
struct ext4_iloc iloc;
|
|
__u32 generation;
|
|
int err;
|
|
|
|
if (!inode_owner_or_capable(mnt_userns, inode))
|
|
return -EPERM;
|
|
|
|
if (ext4_has_metadata_csum(inode->i_sb)) {
|
|
ext4_warning(sb, "Setting inode version is not "
|
|
"supported with metadata_csum enabled.");
|
|
return -ENOTTY;
|
|
}
|
|
|
|
err = mnt_want_write_file(filp);
|
|
if (err)
|
|
return err;
|
|
if (get_user(generation, (int __user *) arg)) {
|
|
err = -EFAULT;
|
|
goto setversion_out;
|
|
}
|
|
|
|
inode_lock(inode);
|
|
handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
|
|
if (IS_ERR(handle)) {
|
|
err = PTR_ERR(handle);
|
|
goto unlock_out;
|
|
}
|
|
err = ext4_reserve_inode_write(handle, inode, &iloc);
|
|
if (err == 0) {
|
|
inode->i_ctime = current_time(inode);
|
|
inode->i_generation = generation;
|
|
err = ext4_mark_iloc_dirty(handle, inode, &iloc);
|
|
}
|
|
ext4_journal_stop(handle);
|
|
|
|
unlock_out:
|
|
inode_unlock(inode);
|
|
setversion_out:
|
|
mnt_drop_write_file(filp);
|
|
return err;
|
|
}
|
|
case EXT4_IOC_GROUP_EXTEND: {
|
|
ext4_fsblk_t n_blocks_count;
|
|
int err, err2=0;
|
|
|
|
err = ext4_resize_begin(sb);
|
|
if (err)
|
|
return err;
|
|
|
|
if (get_user(n_blocks_count, (__u32 __user *)arg)) {
|
|
err = -EFAULT;
|
|
goto group_extend_out;
|
|
}
|
|
|
|
if (ext4_has_feature_bigalloc(sb)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Online resizing not supported with bigalloc");
|
|
err = -EOPNOTSUPP;
|
|
goto group_extend_out;
|
|
}
|
|
|
|
err = mnt_want_write_file(filp);
|
|
if (err)
|
|
goto group_extend_out;
|
|
|
|
err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
|
|
if (EXT4_SB(sb)->s_journal) {
|
|
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
|
|
err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
|
|
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
|
|
}
|
|
if (err == 0)
|
|
err = err2;
|
|
mnt_drop_write_file(filp);
|
|
group_extend_out:
|
|
err2 = ext4_resize_end(sb, false);
|
|
if (err == 0)
|
|
err = err2;
|
|
return err;
|
|
}
|
|
|
|
case EXT4_IOC_MOVE_EXT: {
|
|
struct move_extent me;
|
|
struct fd donor;
|
|
int err;
|
|
|
|
if (!(filp->f_mode & FMODE_READ) ||
|
|
!(filp->f_mode & FMODE_WRITE))
|
|
return -EBADF;
|
|
|
|
if (copy_from_user(&me,
|
|
(struct move_extent __user *)arg, sizeof(me)))
|
|
return -EFAULT;
|
|
me.moved_len = 0;
|
|
|
|
donor = fdget(me.donor_fd);
|
|
if (!donor.file)
|
|
return -EBADF;
|
|
|
|
if (!(donor.file->f_mode & FMODE_WRITE)) {
|
|
err = -EBADF;
|
|
goto mext_out;
|
|
}
|
|
|
|
if (ext4_has_feature_bigalloc(sb)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Online defrag not supported with bigalloc");
|
|
err = -EOPNOTSUPP;
|
|
goto mext_out;
|
|
} else if (IS_DAX(inode)) {
|
|
ext4_msg(sb, KERN_ERR,
|
|
"Online defrag not supported with DAX");
|
|
err = -EOPNOTSUPP;
|
|
goto mext_out;
|
|
}
|
|
|
|
err = mnt_want_write_file(filp);
|
|
if (err)
|
|
goto mext_out;
|
|
|
|
err = ext4_move_extents(filp, donor.file, me.orig_start,
|
|
me.donor_start, me.len, &me.moved_len);
|
|
mnt_drop_write_file(filp);
|
|
|
|
if (copy_to_user((struct move_extent __user *)arg,
|
|
&me, sizeof(me)))
|
|
err = -EFAULT;
|
|
mext_out:
|
|
fdput(donor);
|
|
return err;
|
|
}
|
|
|
|
case EXT4_IOC_GROUP_ADD: {
|
|
struct ext4_new_group_data input;
|
|
|
|
if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
|
|
sizeof(input)))
|
|
return -EFAULT;
|
|
|
|
return ext4_ioctl_group_add(filp, &input);
|
|
}
|
|
|
|
case EXT4_IOC_MIGRATE:
|
|
{
|
|
int err;
|
|
if (!inode_owner_or_capable(mnt_userns, inode))
|
|
return -EACCES;
|
|
|
|
err = mnt_want_write_file(filp);
|
|
if (err)
|
|
return err;
|
|
/*
|
|
* inode_mutex prevent write and truncate on the file.
|
|
* Read still goes through. We take i_data_sem in
|
|
* ext4_ext_swap_inode_data before we switch the
|
|
* inode format to prevent read.
|
|
*/
|
|
inode_lock((inode));
|
|
err = ext4_ext_migrate(inode);
|
|
inode_unlock((inode));
|
|
mnt_drop_write_file(filp);
|
|
return err;
|
|
}
|
|
|
|
case EXT4_IOC_ALLOC_DA_BLKS:
|
|
{
|
|
int err;
|
|
if (!inode_owner_or_capable(mnt_userns, inode))
|
|
return -EACCES;
|
|
|
|
err = mnt_want_write_file(filp);
|
|
if (err)
|
|
return err;
|
|
err = ext4_alloc_da_blocks(inode);
|
|
mnt_drop_write_file(filp);
|
|
return err;
|
|
}
|
|
|
|
case EXT4_IOC_SWAP_BOOT:
|
|
{
|
|
int err;
|
|
if (!(filp->f_mode & FMODE_WRITE))
|
|
return -EBADF;
|
|
err = mnt_want_write_file(filp);
|
|
if (err)
|
|
return err;
|
|
err = swap_inode_boot_loader(sb, mnt_userns, inode);
|
|
mnt_drop_write_file(filp);
|
|
return err;
|
|
}
|
|
|
|
case EXT4_IOC_RESIZE_FS: {
|
|
ext4_fsblk_t n_blocks_count;
|
|
int err = 0, err2 = 0;
|
|
ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
|
|
|
|
if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
|
|
sizeof(__u64))) {
|
|
return -EFAULT;
|
|
}
|
|
|
|
err = ext4_resize_begin(sb);
|
|
if (err)
|
|
return err;
|
|
|
|
err = mnt_want_write_file(filp);
|
|
if (err)
|
|
goto resizefs_out;
|
|
|
|
err = ext4_resize_fs(sb, n_blocks_count);
|
|
if (EXT4_SB(sb)->s_journal) {
|
|
ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL);
|
|
jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
|
|
err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
|
|
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
|
|
}
|
|
if (err == 0)
|
|
err = err2;
|
|
mnt_drop_write_file(filp);
|
|
if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
|
|
ext4_has_group_desc_csum(sb) &&
|
|
test_opt(sb, INIT_INODE_TABLE))
|
|
err = ext4_register_li_request(sb, o_group);
|
|
|
|
resizefs_out:
|
|
err2 = ext4_resize_end(sb, true);
|
|
if (err == 0)
|
|
err = err2;
|
|
return err;
|
|
}
|
|
|
|
case FITRIM:
|
|
{
|
|
struct fstrim_range range;
|
|
int ret = 0;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!bdev_max_discard_sectors(sb->s_bdev))
|
|
return -EOPNOTSUPP;
|
|
|
|
/*
|
|
* We haven't replayed the journal, so we cannot use our
|
|
* block-bitmap-guided storage zapping commands.
|
|
*/
|
|
if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
|
|
return -EROFS;
|
|
|
|
if (copy_from_user(&range, (struct fstrim_range __user *)arg,
|
|
sizeof(range)))
|
|
return -EFAULT;
|
|
|
|
ret = ext4_trim_fs(sb, &range);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (copy_to_user((struct fstrim_range __user *)arg, &range,
|
|
sizeof(range)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
case EXT4_IOC_PRECACHE_EXTENTS:
|
|
return ext4_ext_precache(inode);
|
|
|
|
case FS_IOC_SET_ENCRYPTION_POLICY:
|
|
if (!ext4_has_feature_encrypt(sb))
|
|
return -EOPNOTSUPP;
|
|
return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
|
|
|
|
case FS_IOC_GET_ENCRYPTION_PWSALT:
|
|
return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg);
|
|
|
|
case FS_IOC_GET_ENCRYPTION_POLICY:
|
|
if (!ext4_has_feature_encrypt(sb))
|
|
return -EOPNOTSUPP;
|
|
return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
|
|
|
|
case FS_IOC_GET_ENCRYPTION_POLICY_EX:
|
|
if (!ext4_has_feature_encrypt(sb))
|
|
return -EOPNOTSUPP;
|
|
return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
|
|
|
|
case FS_IOC_ADD_ENCRYPTION_KEY:
|
|
if (!ext4_has_feature_encrypt(sb))
|
|
return -EOPNOTSUPP;
|
|
return fscrypt_ioctl_add_key(filp, (void __user *)arg);
|
|
|
|
case FS_IOC_REMOVE_ENCRYPTION_KEY:
|
|
if (!ext4_has_feature_encrypt(sb))
|
|
return -EOPNOTSUPP;
|
|
return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
|
|
|
|
case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
|
|
if (!ext4_has_feature_encrypt(sb))
|
|
return -EOPNOTSUPP;
|
|
return fscrypt_ioctl_remove_key_all_users(filp,
|
|
(void __user *)arg);
|
|
case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
|
|
if (!ext4_has_feature_encrypt(sb))
|
|
return -EOPNOTSUPP;
|
|
return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
|
|
|
|
case FS_IOC_GET_ENCRYPTION_NONCE:
|
|
if (!ext4_has_feature_encrypt(sb))
|
|
return -EOPNOTSUPP;
|
|
return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
|
|
|
|
case EXT4_IOC_CLEAR_ES_CACHE:
|
|
{
|
|
if (!inode_owner_or_capable(mnt_userns, inode))
|
|
return -EACCES;
|
|
ext4_clear_inode_es(inode);
|
|
return 0;
|
|
}
|
|
|
|
case EXT4_IOC_GETSTATE:
|
|
{
|
|
__u32 state = 0;
|
|
|
|
if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
|
|
state |= EXT4_STATE_FLAG_EXT_PRECACHED;
|
|
if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
|
|
state |= EXT4_STATE_FLAG_NEW;
|
|
if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
|
|
state |= EXT4_STATE_FLAG_NEWENTRY;
|
|
if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
|
|
state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
|
|
|
|
return put_user(state, (__u32 __user *) arg);
|
|
}
|
|
|
|
case EXT4_IOC_GET_ES_CACHE:
|
|
return ext4_ioctl_get_es_cache(filp, arg);
|
|
|
|
case EXT4_IOC_SHUTDOWN:
|
|
return ext4_shutdown(sb, arg);
|
|
|
|
case FS_IOC_ENABLE_VERITY:
|
|
if (!ext4_has_feature_verity(sb))
|
|
return -EOPNOTSUPP;
|
|
return fsverity_ioctl_enable(filp, (const void __user *)arg);
|
|
|
|
case FS_IOC_MEASURE_VERITY:
|
|
if (!ext4_has_feature_verity(sb))
|
|
return -EOPNOTSUPP;
|
|
return fsverity_ioctl_measure(filp, (void __user *)arg);
|
|
|
|
case FS_IOC_READ_VERITY_METADATA:
|
|
if (!ext4_has_feature_verity(sb))
|
|
return -EOPNOTSUPP;
|
|
return fsverity_ioctl_read_metadata(filp,
|
|
(const void __user *)arg);
|
|
|
|
case EXT4_IOC_CHECKPOINT:
|
|
return ext4_ioctl_checkpoint(filp, arg);
|
|
|
|
case FS_IOC_GETFSLABEL:
|
|
return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg);
|
|
|
|
case FS_IOC_SETFSLABEL:
|
|
return ext4_ioctl_setlabel(filp,
|
|
(const void __user *)arg);
|
|
|
|
case EXT4_IOC_GETFSUUID:
|
|
return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg);
|
|
case EXT4_IOC_SETFSUUID:
|
|
return ext4_ioctl_setuuid(filp, (const void __user *)arg);
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return __ext4_ioctl(filp, cmd, arg);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
/* These are just misnamed, they actually get/put from/to user an int */
|
|
switch (cmd) {
|
|
case EXT4_IOC32_GETVERSION:
|
|
cmd = EXT4_IOC_GETVERSION;
|
|
break;
|
|
case EXT4_IOC32_SETVERSION:
|
|
cmd = EXT4_IOC_SETVERSION;
|
|
break;
|
|
case EXT4_IOC32_GROUP_EXTEND:
|
|
cmd = EXT4_IOC_GROUP_EXTEND;
|
|
break;
|
|
case EXT4_IOC32_GETVERSION_OLD:
|
|
cmd = EXT4_IOC_GETVERSION_OLD;
|
|
break;
|
|
case EXT4_IOC32_SETVERSION_OLD:
|
|
cmd = EXT4_IOC_SETVERSION_OLD;
|
|
break;
|
|
case EXT4_IOC32_GETRSVSZ:
|
|
cmd = EXT4_IOC_GETRSVSZ;
|
|
break;
|
|
case EXT4_IOC32_SETRSVSZ:
|
|
cmd = EXT4_IOC_SETRSVSZ;
|
|
break;
|
|
case EXT4_IOC32_GROUP_ADD: {
|
|
struct compat_ext4_new_group_input __user *uinput;
|
|
struct ext4_new_group_data input;
|
|
int err;
|
|
|
|
uinput = compat_ptr(arg);
|
|
err = get_user(input.group, &uinput->group);
|
|
err |= get_user(input.block_bitmap, &uinput->block_bitmap);
|
|
err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
|
|
err |= get_user(input.inode_table, &uinput->inode_table);
|
|
err |= get_user(input.blocks_count, &uinput->blocks_count);
|
|
err |= get_user(input.reserved_blocks,
|
|
&uinput->reserved_blocks);
|
|
if (err)
|
|
return -EFAULT;
|
|
return ext4_ioctl_group_add(file, &input);
|
|
}
|
|
case EXT4_IOC_MOVE_EXT:
|
|
case EXT4_IOC_RESIZE_FS:
|
|
case FITRIM:
|
|
case EXT4_IOC_PRECACHE_EXTENTS:
|
|
case FS_IOC_SET_ENCRYPTION_POLICY:
|
|
case FS_IOC_GET_ENCRYPTION_PWSALT:
|
|
case FS_IOC_GET_ENCRYPTION_POLICY:
|
|
case FS_IOC_GET_ENCRYPTION_POLICY_EX:
|
|
case FS_IOC_ADD_ENCRYPTION_KEY:
|
|
case FS_IOC_REMOVE_ENCRYPTION_KEY:
|
|
case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
|
|
case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
|
|
case FS_IOC_GET_ENCRYPTION_NONCE:
|
|
case EXT4_IOC_SHUTDOWN:
|
|
case FS_IOC_GETFSMAP:
|
|
case FS_IOC_ENABLE_VERITY:
|
|
case FS_IOC_MEASURE_VERITY:
|
|
case FS_IOC_READ_VERITY_METADATA:
|
|
case EXT4_IOC_CLEAR_ES_CACHE:
|
|
case EXT4_IOC_GETSTATE:
|
|
case EXT4_IOC_GET_ES_CACHE:
|
|
case EXT4_IOC_CHECKPOINT:
|
|
case FS_IOC_GETFSLABEL:
|
|
case FS_IOC_SETFSLABEL:
|
|
case EXT4_IOC_GETFSUUID:
|
|
case EXT4_IOC_SETFSUUID:
|
|
break;
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
|
|
}
|
|
#endif
|
|
|
|
static void set_overhead(struct ext4_super_block *es, const void *arg)
|
|
{
|
|
es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg));
|
|
}
|
|
|
|
int ext4_update_overhead(struct super_block *sb, bool force)
|
|
{
|
|
struct ext4_sb_info *sbi = EXT4_SB(sb);
|
|
|
|
if (sb_rdonly(sb))
|
|
return 0;
|
|
if (!force &&
|
|
(sbi->s_overhead == 0 ||
|
|
sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters)))
|
|
return 0;
|
|
return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead);
|
|
}
|