/* * Check a range of space and convert unwritten extents to written. Note that * we are protected from truncate touching same part of extent tree by the * fact that truncate code waits for all DIO to finish (thus exclusion from * direct IO is achieved) and also waits for PageWriteback bits. Thus we * cannot get to ext4_ext_truncate() before all IOs overlapping that range are * completed (happens from ext4_free_ioend()). */ static int ext4_end_io(ext4_io_end_t *io) { struct inode *inode = io->inode; loff_t offset = io->offset; ssize_t size = io->size; handle_t *handle = io->handle; int ret = 0; ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," "list->prev 0x%p\n", io, inode->i_ino, io->list.next, io->list.prev); io->handle = NULL; /* Following call will use up the handle */ ret = ext4_convert_unwritten_extents(handle, inode, offset, size); if (ret < 0) { ext4_msg(inode->i_sb, KERN_EMERG, "failed to convert unwritten extents to written " "extents -- potential data loss! " "(inode %lu, offset %llu, size %zd, error %d)", inode->i_ino, offset, size, ret); } ext4_clear_io_unwritten_flag(io); ext4_release_io_end(io); return ret; }
/* * check a range of space and convert unwritten extents to written. * * Called with inode->i_mutex; we depend on this when we manipulate * io->flag, since we could otherwise race with ext4_flush_completed_IO() */ int ext4_end_io_nolock(ext4_io_end_t *io) { struct inode *inode = io->inode; loff_t offset = io->offset; ssize_t size = io->size; int ret = 0; ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," "list->prev 0x%p\n", io, inode->i_ino, io->list.next, io->list.prev); ret = ext4_convert_unwritten_extents(inode, offset, size); if (ret < 0) { ext4_msg(inode->i_sb, KERN_EMERG, "failed to convert unwritten extents to written " "extents -- potential data loss! " "(inode %lu, offset %llu, size %zd, error %d)", inode->i_ino, offset, size, ret); } /* Wake up anyone waiting on unwritten extent conversion */ if (atomic_dec_and_test(&EXT4_I(inode)->i_aiodio_unwritten)) wake_up_all(ext4_ioend_wq(io->inode)); if (io->flag & EXT4_IO_END_DIRECT) inode_dio_done(inode); if (io->iocb) aio_complete(io->iocb, io->result, 0); return ret; }
/* * check a range of space and convert unwritten extents to written. */ int ext4_end_io_nolock(ext4_io_end_t *io) { struct inode *inode = io->inode; loff_t offset = io->offset; ssize_t size = io->size; int ret = 0; ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," "list->prev 0x%p\n", io, inode->i_ino, io->list.next, io->list.prev); if (list_empty(&io->list)) return ret; if (!(io->flag & EXT4_IO_END_UNWRITTEN)) return ret; ret = ext4_convert_unwritten_extents(inode, offset, size); if (ret < 0) { printk(KERN_EMERG "%s: failed to convert unwritten " "extents to written extents, error is %d " "io is still on inode %lu aio dio list\n", __func__, ret, inode->i_ino); return ret; } if (io->iocb) aio_complete(io->iocb, io->result, 0); /* clear the DIO AIO unwritten flag */ io->flag &= ~EXT4_IO_END_UNWRITTEN; return ret; }
static void dump_completed_IO(struct inode *inode, struct list_head *head) { #ifdef EXT4FS_DEBUG struct list_head *cur, *before, *after; ext4_io_end_t *io, *io0, *io1; if (list_empty(head)) return; ext4_debug("Dump inode %lu completed io list\n", inode->i_ino); list_for_each_entry(io, head, list) { cur = &io->list; before = cur->prev; io0 = container_of(before, ext4_io_end_t, list); after = cur->next; io1 = container_of(after, ext4_io_end_t, list); ext4_debug("io 0x%p from inode %lu,prev 0x%p,next 0x%p\n", io, inode->i_ino, io0, io1); }
/* * check a range of space and convert unwritten extents to written. */ int ext4_end_io_nolock(ext4_io_end_t *io) { struct inode *inode = io->inode; loff_t offset = io->offset; ssize_t size = io->size; wait_queue_head_t *wq; int ret = 0; ext4_debug("ext4_end_io_nolock: io 0x%p from inode %lu,list->next 0x%p," "list->prev 0x%p\n", io, inode->i_ino, io->list.next, io->list.prev); if (list_empty(&io->list)) return ret; if (!(io->flag & EXT4_IO_END_UNWRITTEN)) return ret; ret = ext4_convert_unwritten_extents(inode, offset, size); if (ret < 0) { printk(KERN_EMERG "%s: failed to convert unwritten " "extents to written extents, error is %d " "io is still on inode %lu aio dio list\n", __func__, ret, inode->i_ino); return ret; } if (io->iocb) aio_complete(io->iocb, io->result, 0); /* clear the DIO AIO unwritten flag */ if (io->flag & EXT4_IO_END_UNWRITTEN) { io->flag &= ~EXT4_IO_END_UNWRITTEN; /* Wake up anyone waiting on unwritten extent conversion */ wq = ext4_ioend_wq(io->inode); if (atomic_dec_and_test(&EXT4_I(inode)->i_aiodio_unwritten) && waitqueue_active(wq)) { wake_up_all(wq); } } return ret; }
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 ext4_inode_info *ei = EXT4_I(inode); unsigned int flags; ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT4_IOC_GETFLAGS: ext4_get_inode_flags(ei); flags = ei->i_flags & EXT4_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT4_IOC_SETFLAGS: { handle_t *handle = NULL; int err, migrate = 0; struct ext4_iloc iloc; unsigned int oldflags, mask, i; unsigned int jflag; if (!inode_owner_or_capable(inode)) return -EACCES; if (get_user(flags, (int __user *) arg)) return -EFAULT; err = mnt_want_write_file(filp); if (err) return err; flags = ext4_mask_flags(inode->i_mode, flags); err = -EPERM; mutex_lock(&inode->i_mutex); /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) goto flags_out; oldflags = ei->i_flags; /* The JOURNAL_DATA flag is modifiable only by root */ jflag = flags & EXT4_JOURNAL_DATA_FL; /* * The IMMUTABLE and APPEND_ONLY flags can only be changed by * the relevant capability. * * This test looks nicer. Thanks to Pauline Middelink */ if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { if (!capable(CAP_LINUX_IMMUTABLE)) goto flags_out; } /* * The JOURNAL_DATA flag can only be changed by * the relevant capability. */ if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { if (!capable(CAP_SYS_RESOURCE)) goto flags_out; } if ((flags ^ oldflags) & EXT4_EXTENTS_FL) migrate = 1; if (flags & EXT4_EOFBLOCKS_FL) { /* we don't support adding EOFBLOCKS flag */ if (!(oldflags & EXT4_EOFBLOCKS_FL)) { err = -EOPNOTSUPP; goto flags_out; } } else if (oldflags & EXT4_EOFBLOCKS_FL) ext4_truncate(inode); 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; for (i = 0, mask = 1; i < 32; i++, mask <<= 1) { if (!(mask & EXT4_FL_USER_MODIFIABLE)) continue; if (mask & flags) ext4_set_inode_flag(inode, i); else ext4_clear_inode_flag(inode, i); } ext4_set_inode_flags(inode); inode->i_ctime = ext4_current_time(inode); err = ext4_mark_iloc_dirty(handle, inode, &iloc); flags_err: ext4_journal_stop(handle); if (err) goto flags_out; if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) err = ext4_change_inode_journal_flag(inode, jflag); 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: mutex_unlock(&inode->i_mutex); mnt_drop_write_file(filp); return err; } 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(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; } mutex_lock(&inode->i_mutex); 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 = ext4_current_time(inode); inode->i_generation = generation; err = ext4_mark_iloc_dirty(handle, inode, &iloc); } ext4_journal_stop(handle); unlock_out: mutex_unlock(&inode->i_mutex); 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_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 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); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); } if (err == 0) err = err2; mnt_drop_write_file(filp); group_extend_out: ext4_resize_end(sb); 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_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "Online defrag not supported with bigalloc"); 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; int err, err2=0; err = ext4_resize_begin(sb); if (err) return err; if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, sizeof(input))) { err = -EFAULT; goto group_add_out; } if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "Online resizing not supported with bigalloc"); err = -EOPNOTSUPP; goto group_add_out; } err = mnt_want_write_file(filp); 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); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); } if (err == 0) err = err2; mnt_drop_write_file(filp); 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: ext4_resize_end(sb); return err; } case EXT4_IOC_MIGRATE: { int err; if (!inode_owner_or_capable(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. */ mutex_lock(&(inode->i_mutex)); err = ext4_ext_migrate(inode); mutex_unlock(&(inode->i_mutex)); mnt_drop_write_file(filp); return err; } case EXT4_IOC_ALLOC_DA_BLKS: { int err; if (!inode_owner_or_capable(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, 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 (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "Online resizing not (yet) supported with bigalloc"); return -EOPNOTSUPP; } 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) { jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 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: ext4_resize_end(sb); return err; } case FIDTRIM: case FITRIM: { struct request_queue *q = bdev_get_queue(sb->s_bdev); struct fstrim_range range; int ret = 0; int flags = cmd == FIDTRIM ? BLKDEV_DISCARD_SECURE : 0; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!blk_queue_discard(q)) return -EOPNOTSUPP; if ((flags & BLKDEV_DISCARD_SECURE) && !blk_queue_secdiscard(q)) return -EOPNOTSUPP; if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) return -EFAULT; range.minlen = max((unsigned int)range.minlen, q->limits.discard_granularity); ret = ext4_trim_fs(sb, &range, flags); 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); default: return -ENOTTY; } }
/** * ext4_add_groupblocks() -- Add given blocks to an existing group * @handle: handle to this transaction * @sb: super block * @block: start physcial block to add to the block group * @count: number of blocks to free * * This marks the blocks as free in the bitmap. We ask the * mballoc to reload the buddy after this by setting group * EXT4_GROUP_INFO_NEED_INIT_BIT flag */ void ext4_add_groupblocks(handle_t *handle, struct super_block *sb, ext4_fsblk_t block, unsigned long count) { struct buffer_head *bitmap_bh = NULL; struct buffer_head *gd_bh; ext4_group_t block_group; ext4_grpblk_t bit; unsigned int i; struct ext4_group_desc *desc; struct ext4_sb_info *sbi = EXT4_SB(sb); int err = 0, ret, blk_free_count; ext4_grpblk_t blocks_freed; struct ext4_group_info *grp; ext4_debug("Adding block(s) %llu-%llu\n", block, block + count - 1); ext4_get_group_no_and_offset(sb, block, &block_group, &bit); grp = ext4_get_group_info(sb, block_group); /* * Check to see if we are freeing blocks across a group * boundary. */ if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) { goto error_return; } bitmap_bh = ext4_read_block_bitmap(sb, block_group); if (!bitmap_bh) goto error_return; desc = ext4_get_group_desc(sb, block_group, &gd_bh); if (!desc) goto error_return; if (in_range(ext4_block_bitmap(sb, desc), block, count) || in_range(ext4_inode_bitmap(sb, desc), block, count) || in_range(block, ext4_inode_table(sb, desc), sbi->s_itb_per_group) || in_range(block + count - 1, ext4_inode_table(sb, desc), sbi->s_itb_per_group)) { ext4_error(sb, __func__, "Adding blocks in system zones - " "Block = %llu, count = %lu", block, count); goto error_return; } /* * We are about to add blocks to the bitmap, * so we need undo access. */ BUFFER_TRACE(bitmap_bh, "getting undo access"); err = ext4_journal_get_undo_access(handle, bitmap_bh); if (err) goto error_return; /* * We are about to modify some metadata. Call the journal APIs * to unshare ->b_data if a currently-committing transaction is * using it */ BUFFER_TRACE(gd_bh, "get_write_access"); err = ext4_journal_get_write_access(handle, gd_bh); if (err) goto error_return; /* * make sure we don't allow a parallel init on other groups in the * same buddy cache */ down_write(&grp->alloc_sem); for (i = 0, blocks_freed = 0; i < count; i++) { BUFFER_TRACE(bitmap_bh, "clear bit"); if (!ext4_clear_bit_atomic(ext4_group_lock_ptr(sb, block_group), bit + i, bitmap_bh->b_data)) { ext4_error(sb, __func__, "bit already cleared for block %llu", (ext4_fsblk_t)(block + i)); BUFFER_TRACE(bitmap_bh, "bit already cleared"); } else { blocks_freed++; } } ext4_lock_group(sb, block_group); blk_free_count = blocks_freed + ext4_free_blks_count(sb, desc); ext4_free_blks_set(sb, desc, blk_free_count); desc->bg_checksum = ext4_group_desc_csum(sbi, block_group, desc); ext4_unlock_group(sb, block_group); percpu_counter_mod(&sbi->s_freeblocks_counter, blocks_freed); if (sbi->s_log_groups_per_flex) { ext4_group_t flex_group = ext4_flex_group(sbi, block_group); atomic_add(blocks_freed, &sbi->s_flex_groups[flex_group].free_blocks); } /* * request to reload the buddy with the * new bitmap information */ set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state)); grp->bb_free += blocks_freed; up_write(&grp->alloc_sem); /* We dirtied the bitmap block */ BUFFER_TRACE(bitmap_bh, "dirtied bitmap block"); err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh); /* And the group descriptor block */ BUFFER_TRACE(gd_bh, "dirtied group descriptor block"); ret = ext4_handle_dirty_metadata(handle, NULL, gd_bh); if (!err) err = ret; error_return: brelse(bitmap_bh); ext4_std_error(sb, err); return; }
int ext4_ioctl (struct inode * inode, struct file * filp, unsigned int cmd, unsigned long arg) { struct ext4_inode_info *ei = EXT4_I(inode); unsigned int flags; unsigned short rsv_window_size; ext4_debug ("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT4_IOC_GETFLAGS: ext4_get_inode_flags(ei); flags = ei->i_flags & EXT4_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT4_IOC_SETFLAGS: { handle_t *handle = NULL; int err; struct ext4_iloc iloc; unsigned int oldflags; unsigned int jflag; if (IS_RDONLY(inode)) return -EROFS; if (!is_owner_or_cap(inode)) return -EACCES; if (get_user(flags, (int __user *) arg)) return -EFAULT; if (!S_ISDIR(inode->i_mode)) flags &= ~EXT4_DIRSYNC_FL; mutex_lock(&inode->i_mutex); /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) { mutex_unlock(&inode->i_mutex); return -EPERM; } oldflags = ei->i_flags; /* The JOURNAL_DATA flag is modifiable only by root */ jflag = flags & EXT4_JOURNAL_DATA_FL; /* * The IMMUTABLE and APPEND_ONLY flags can only be changed by * the relevant capability. * * This test looks nicer. Thanks to Pauline Middelink */ if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { if (!capable(CAP_LINUX_IMMUTABLE)) { mutex_unlock(&inode->i_mutex); return -EPERM; } } /* * The JOURNAL_DATA flag can only be changed by * the relevant capability. */ if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { if (!capable(CAP_SYS_RESOURCE)) { mutex_unlock(&inode->i_mutex); return -EPERM; } } handle = ext4_journal_start(inode, 1); if (IS_ERR(handle)) { mutex_unlock(&inode->i_mutex); return PTR_ERR(handle); } if (IS_SYNC(inode)) handle->h_sync = 1; err = ext4_reserve_inode_write(handle, inode, &iloc); if (err) goto flags_err; flags = flags & EXT4_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; ei->i_flags = flags; ext4_set_inode_flags(inode); inode->i_ctime = ext4_current_time(inode); err = ext4_mark_iloc_dirty(handle, inode, &iloc); flags_err: ext4_journal_stop(handle); if (err) { mutex_unlock(&inode->i_mutex); return err; } if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) err = ext4_change_inode_journal_flag(inode, jflag); mutex_unlock(&inode->i_mutex); return err; } 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 (!is_owner_or_cap(inode)) return -EPERM; if (IS_RDONLY(inode)) return -EROFS; if (get_user(generation, (int __user *) arg)) return -EFAULT; handle = ext4_journal_start(inode, 1); if (IS_ERR(handle)) return PTR_ERR(handle); err = ext4_reserve_inode_write(handle, inode, &iloc); if (err == 0) { inode->i_ctime = ext4_current_time(inode); inode->i_generation = generation; err = ext4_mark_iloc_dirty(handle, inode, &iloc); } ext4_journal_stop(handle); return err; } #ifdef CONFIG_JBD2_DEBUG case EXT4_IOC_WAIT_FOR_READONLY: /* * This is racy - by the time we're woken up and running, * the superblock could be released. And the module could * have been unloaded. So sue me. * * Returns 1 if it slept, else zero. */ { struct super_block *sb = inode->i_sb; DECLARE_WAITQUEUE(wait, current); int ret = 0; set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) { schedule(); ret = 1; } remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); return ret; } #endif case EXT4_IOC_GETRSVSZ: if (test_opt(inode->i_sb, RESERVATION) && S_ISREG(inode->i_mode) && ei->i_block_alloc_info) { rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size; return put_user(rsv_window_size, (int __user *)arg); } return -ENOTTY; case EXT4_IOC_SETRSVSZ: { if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode)) return -ENOTTY; if (IS_RDONLY(inode)) return -EROFS; if (!is_owner_or_cap(inode)) return -EACCES; if (get_user(rsv_window_size, (int __user *)arg)) return -EFAULT; if (rsv_window_size > EXT4_MAX_RESERVE_BLOCKS) rsv_window_size = EXT4_MAX_RESERVE_BLOCKS; /* * need to allocate reservation structure for this inode * before set the window size */ mutex_lock(&ei->truncate_mutex); if (!ei->i_block_alloc_info) ext4_init_block_alloc_info(inode); if (ei->i_block_alloc_info){ struct ext4_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node; rsv->rsv_goal_size = rsv_window_size; } mutex_unlock(&ei->truncate_mutex); return 0; } case EXT4_IOC_GROUP_EXTEND: { ext4_fsblk_t n_blocks_count; struct super_block *sb = inode->i_sb; int err; if (!capable(CAP_SYS_RESOURCE)) return -EPERM; if (IS_RDONLY(inode)) return -EROFS; if (get_user(n_blocks_count, (__u32 __user *)arg)) return -EFAULT; err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); jbd2_journal_flush(EXT4_SB(sb)->s_journal); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); return err; } case EXT4_IOC_GROUP_ADD: { struct ext4_new_group_data input; struct super_block *sb = inode->i_sb; int err; if (!capable(CAP_SYS_RESOURCE)) return -EPERM; if (IS_RDONLY(inode)) return -EROFS; if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, sizeof(input))) return -EFAULT; err = ext4_group_add(sb, &input); jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); jbd2_journal_flush(EXT4_SB(sb)->s_journal); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); return err; } default: return -ENOTTY; } }
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = filp->f_dentry->d_inode; struct super_block *sb = inode->i_sb; struct ext4_inode_info *ei = EXT4_I(inode); unsigned int flags; ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT4_IOC_GETFLAGS: ext4_get_inode_flags(ei); flags = ei->i_flags & EXT4_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT4_IOC_SETFLAGS: { handle_t *handle = NULL; int err, migrate = 0; struct ext4_iloc iloc; unsigned int oldflags; unsigned int jflag; if (!inode_owner_or_capable(inode)) return -EACCES; if (get_user(flags, (int __user *) arg)) return -EFAULT; err = mnt_want_write_file(filp); if (err) return err; flags = ext4_mask_flags(inode->i_mode, flags); err = -EPERM; mutex_lock(&inode->i_mutex); /* */ if (IS_NOQUOTA(inode)) goto flags_out; oldflags = ei->i_flags; /* */ jflag = flags & EXT4_JOURNAL_DATA_FL; /* */ if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { if (!capable(CAP_LINUX_IMMUTABLE)) goto flags_out; } /* */ if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { if (!capable(CAP_SYS_RESOURCE)) goto flags_out; } if (oldflags & EXT4_EXTENTS_FL) { /* */ if (!(flags & EXT4_EXTENTS_FL)) { err = -EOPNOTSUPP; goto flags_out; } } else if (flags & EXT4_EXTENTS_FL) { /* */ migrate = 1; flags &= ~EXT4_EXTENTS_FL; } if (flags & EXT4_EOFBLOCKS_FL) { /* */ if (!(oldflags & EXT4_EOFBLOCKS_FL)) { err = -EOPNOTSUPP; goto flags_out; } } else if (oldflags & EXT4_EOFBLOCKS_FL) ext4_truncate(inode); handle = ext4_journal_start(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; flags = flags & EXT4_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; ei->i_flags = flags; ext4_set_inode_flags(inode); inode->i_ctime = ext4_current_time(inode); err = ext4_mark_iloc_dirty(handle, inode, &iloc); flags_err: ext4_journal_stop(handle); if (err) goto flags_out; if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) err = ext4_change_inode_journal_flag(inode, jflag); if (err) goto flags_out; if (migrate) err = ext4_ext_migrate(inode); flags_out: mutex_unlock(&inode->i_mutex); mnt_drop_write_file(filp); return err; } 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(inode)) return -EPERM; err = mnt_want_write_file(filp); if (err) return err; if (get_user(generation, (int __user *) arg)) { err = -EFAULT; goto setversion_out; } mutex_lock(&inode->i_mutex); handle = ext4_journal_start(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 = ext4_current_time(inode); inode->i_generation = generation; err = ext4_mark_iloc_dirty(handle, inode, &iloc); } ext4_journal_stop(handle); unlock_out: mutex_unlock(&inode->i_mutex); 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_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 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); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); } if (err == 0) err = err2; mnt_drop_write_file(filp); group_extend_out: ext4_resize_end(sb); return err; } case EXT4_IOC_MOVE_EXT: { struct move_extent me; struct file *donor_filp; 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_filp = fget(me.donor_fd); if (!donor_filp) return -EBADF; if (!(donor_filp->f_mode & FMODE_WRITE)) { err = -EBADF; goto mext_out; } if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "Online defrag not supported with bigalloc"); return -EOPNOTSUPP; } err = mnt_want_write_file(filp); if (err) goto mext_out; err = ext4_move_extents(filp, donor_filp, me.orig_start, me.donor_start, me.len, &me.moved_len); mnt_drop_write_file(filp); mnt_drop_write(filp->f_path.mnt); if (copy_to_user((struct move_extent __user *)arg, &me, sizeof(me))) err = -EFAULT; mext_out: fput(donor_filp); return err; } case EXT4_IOC_GROUP_ADD: { struct ext4_new_group_data input; int err, err2=0; err = ext4_resize_begin(sb); if (err) return err; if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, sizeof(input))) { err = -EFAULT; goto group_add_out; } if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "Online resizing not supported with bigalloc"); err = -EOPNOTSUPP; goto group_add_out; } err = mnt_want_write_file(filp); 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); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); } if (err == 0) err = err2; mnt_drop_write_file(filp); group_add_out: ext4_resize_end(sb); return err; } case EXT4_IOC_MIGRATE: { int err; if (!inode_owner_or_capable(inode)) return -EACCES; err = mnt_want_write_file(filp); if (err) return err; /* */ mutex_lock(&(inode->i_mutex)); err = ext4_ext_migrate(inode); mutex_unlock(&(inode->i_mutex)); mnt_drop_write_file(filp); return err; } case EXT4_IOC_ALLOC_DA_BLKS: { int err; if (!inode_owner_or_capable(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_RESIZE_FS: { ext4_fsblk_t n_blocks_count; struct super_block *sb = inode->i_sb; int err = 0, err2 = 0; if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "Online resizing not (yet) supported with bigalloc"); return -EOPNOTSUPP; } if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG)) { ext4_msg(sb, KERN_ERR, "Online resizing not (yet) supported with meta_bg"); return -EOPNOTSUPP; } if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, sizeof(__u64))) { return -EFAULT; } if (n_blocks_count > MAX_32_NUM && !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { ext4_msg(sb, KERN_ERR, "File system only supports 32-bit block numbers"); return -EOPNOTSUPP; } err = ext4_resize_begin(sb); if (err) return err; err = mnt_want_write(filp->f_path.mnt); if (err) goto resizefs_out; err = ext4_resize_fs(sb, 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); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); } if (err == 0) err = err2; mnt_drop_write(filp->f_path.mnt); resizefs_out: ext4_resize_end(sb); return err; } case FITRIM: { struct request_queue *q = bdev_get_queue(sb->s_bdev); struct fstrim_range range; int ret = 0; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!blk_queue_discard(q)) return -EOPNOTSUPP; if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "FITRIM not supported with bigalloc"); return -EOPNOTSUPP; } if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) return -EFAULT; range.minlen = max((unsigned int)range.minlen, q->limits.discard_granularity); 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; } default: return -ENOTTY; } }
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = filp->f_dentry->d_inode; struct super_block *sb = inode->i_sb; struct ext4_inode_info *ei = EXT4_I(inode); unsigned int flags; ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT4_IOC_GETFLAGS: ext4_get_inode_flags(ei); flags = ei->i_flags & EXT4_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT4_IOC_SETFLAGS: { handle_t *handle = NULL; int err, migrate = 0; struct ext4_iloc iloc; unsigned int oldflags; unsigned int jflag; if (!is_owner_or_cap(inode)) return -EACCES; if (get_user(flags, (int __user *) arg)) return -EFAULT; err = mnt_want_write(filp->f_path.mnt); if (err) return err; flags = ext4_mask_flags(inode->i_mode, flags); err = -EPERM; mutex_lock(&inode->i_mutex); /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) goto flags_out; oldflags = ei->i_flags; /* The JOURNAL_DATA flag is modifiable only by root */ jflag = flags & EXT4_JOURNAL_DATA_FL; /* * The IMMUTABLE and APPEND_ONLY flags can only be changed by * the relevant capability. * * This test looks nicer. Thanks to Pauline Middelink */ if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { if (!capable(CAP_LINUX_IMMUTABLE)) goto flags_out; } /* * The JOURNAL_DATA flag can only be changed by * the relevant capability. */ if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { if (!capable(CAP_SYS_RESOURCE)) goto flags_out; } if (oldflags & EXT4_EXTENTS_FL) { /* We don't support clearning extent flags */ if (!(flags & EXT4_EXTENTS_FL)) { err = -EOPNOTSUPP; goto flags_out; } } else if (flags & EXT4_EXTENTS_FL) { /* migrate the file */ migrate = 1; flags &= ~EXT4_EXTENTS_FL; } if (flags & EXT4_EOFBLOCKS_FL) { /* we don't support adding EOFBLOCKS flag */ if (!(oldflags & EXT4_EOFBLOCKS_FL)) { err = -EOPNOTSUPP; goto flags_out; } } else if (oldflags & EXT4_EOFBLOCKS_FL) ext4_truncate(inode); handle = ext4_journal_start(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; flags = flags & EXT4_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; ei->i_flags = flags; ext4_set_inode_flags(inode); inode->i_ctime = ext4_current_time(inode); err = ext4_mark_iloc_dirty(handle, inode, &iloc); flags_err: ext4_journal_stop(handle); if (err) goto flags_out; if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) err = ext4_change_inode_journal_flag(inode, jflag); if (err) goto flags_out; if (migrate) err = ext4_ext_migrate(inode); flags_out: mutex_unlock(&inode->i_mutex); mnt_drop_write(filp->f_path.mnt); return err; } 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 (!is_owner_or_cap(inode)) return -EPERM; err = mnt_want_write(filp->f_path.mnt); if (err) return err; if (get_user(generation, (int __user *) arg)) { err = -EFAULT; goto setversion_out; } handle = ext4_journal_start(inode, 1); if (IS_ERR(handle)) { err = PTR_ERR(handle); goto setversion_out; } err = ext4_reserve_inode_write(handle, inode, &iloc); if (err == 0) { inode->i_ctime = ext4_current_time(inode); inode->i_generation = generation; err = ext4_mark_iloc_dirty(handle, inode, &iloc); } ext4_journal_stop(handle); setversion_out: mnt_drop_write(filp->f_path.mnt); return err; } #ifdef CONFIG_JBD2_DEBUG case EXT4_IOC_WAIT_FOR_READONLY: /* * This is racy - by the time we're woken up and running, * the superblock could be released. And the module could * have been unloaded. So sue me. * * Returns 1 if it slept, else zero. */ { DECLARE_WAITQUEUE(wait, current); int ret = 0; set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) { schedule(); ret = 1; } remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); return ret; } #endif case EXT4_IOC_GROUP_EXTEND: { ext4_fsblk_t n_blocks_count; int err, err2=0; if (!capable(CAP_SYS_RESOURCE)) return -EPERM; if (get_user(n_blocks_count, (__u32 __user *)arg)) return -EFAULT; if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "Online resizing not supported with bigalloc"); return -EOPNOTSUPP; } err = mnt_want_write(filp->f_path.mnt); if (err) return err; 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); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); } if (err == 0) err = err2; mnt_drop_write(filp->f_path.mnt); return err; } case EXT4_IOC_MOVE_EXT: { struct move_extent me; struct file *donor_filp; 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; donor_filp = fget(me.donor_fd); if (!donor_filp) return -EBADF; if (!(donor_filp->f_mode & FMODE_WRITE)) { err = -EBADF; goto mext_out; } if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "Online defrag not supported with bigalloc"); return -EOPNOTSUPP; } err = mnt_want_write(filp->f_path.mnt); if (err) goto mext_out; me.moved_len = 0; err = ext4_move_extents(filp, donor_filp, me.orig_start, me.donor_start, me.len, &me.moved_len); mnt_drop_write(filp->f_path.mnt); if (me.moved_len > 0) file_remove_suid(donor_filp); if (copy_to_user((struct move_extent *)arg, &me, sizeof(me))) err = -EFAULT; mext_out: fput(donor_filp); return err; } case EXT4_IOC_GROUP_ADD: { struct ext4_new_group_data input; int err, err2=0; if (!capable(CAP_SYS_RESOURCE)) return -EPERM; if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, sizeof(input))) return -EFAULT; if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "Online resizing not supported with bigalloc"); return -EOPNOTSUPP; } err = mnt_want_write(filp->f_path.mnt); if (err) return err; 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); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); } if (err == 0) err = err2; mnt_drop_write(filp->f_path.mnt); return err; } case EXT4_IOC_MIGRATE: { int err; if (!is_owner_or_cap(inode)) return -EACCES; err = mnt_want_write(filp->f_path.mnt); 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. */ mutex_lock(&(inode->i_mutex)); err = ext4_ext_migrate(inode); mutex_unlock(&(inode->i_mutex)); mnt_drop_write(filp->f_path.mnt); return err; } case EXT4_IOC_ALLOC_DA_BLKS: { int err; if (!is_owner_or_cap(inode)) return -EACCES; err = mnt_want_write(filp->f_path.mnt); if (err) return err; err = ext4_alloc_da_blocks(inode); mnt_drop_write(filp->f_path.mnt); return err; } case FITRIM: { struct request_queue *q = bdev_get_queue(sb->s_bdev); struct fstrim_range range; int ret = 0; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!blk_queue_discard(q)) return -EOPNOTSUPP; if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { ext4_msg(sb, KERN_ERR, "FITRIM not supported with bigalloc"); return -EOPNOTSUPP; } if (copy_from_user(&range, (struct fstrim_range *)arg, sizeof(range))) return -EFAULT; range.minlen = max((unsigned int)range.minlen, q->limits.discard_granularity); ret = ext4_trim_fs(sb, &range); if (ret < 0) return ret; if (copy_to_user((struct fstrim_range *)arg, &range, sizeof(range))) return -EFAULT; return 0; } default: return -ENOTTY; } }
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 ext4_inode_info *ei = EXT4_I(inode); unsigned int flags; 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_GETFLAGS: flags = ei->i_flags & EXT4_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT4_IOC_SETFLAGS: { int err; if (!inode_owner_or_capable(inode)) return -EACCES; if (get_user(flags, (int __user *) arg)) return -EFAULT; if (flags & ~EXT4_FL_USER_VISIBLE) return -EOPNOTSUPP; /* * 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) return -EOPNOTSUPP; err = mnt_want_write_file(filp); if (err) return err; inode_lock(inode); err = ext4_ioctl_setflags(inode, flags); inode_unlock(inode); mnt_drop_write_file(filp); return err; } 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(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); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); } if (err == 0) err = err2; mnt_drop_write_file(filp); group_extend_out: ext4_resize_end(sb); 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(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(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, 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) { jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 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: ext4_resize_end(sb); return err; } case FITRIM: { struct request_queue *q = bdev_get_queue(sb->s_bdev); struct fstrim_range range; int ret = 0; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (!blk_queue_discard(q)) return -EOPNOTSUPP; if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range))) return -EFAULT; range.minlen = max((unsigned int)range.minlen, q->limits.discard_granularity); 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 EXT4_IOC_SET_ENCRYPTION_POLICY: if (!ext4_has_feature_encrypt(sb)) return -EOPNOTSUPP; return fscrypt_ioctl_set_policy(filp, (const void __user *)arg); case EXT4_IOC_GET_ENCRYPTION_PWSALT: { #ifdef CONFIG_EXT4_FS_ENCRYPTION int err, err2; struct ext4_sb_info *sbi = EXT4_SB(sb); handle_t *handle; if (!ext4_has_feature_encrypt(sb)) return -EOPNOTSUPP; if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) { err = mnt_want_write_file(filp); if (err) return err; handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); if (IS_ERR(handle)) { err = PTR_ERR(handle); goto pwsalt_err_exit; } err = ext4_journal_get_write_access(handle, sbi->s_sbh); if (err) goto pwsalt_err_journal; generate_random_uuid(sbi->s_es->s_encrypt_pw_salt); err = ext4_handle_dirty_metadata(handle, NULL, sbi->s_sbh); pwsalt_err_journal: err2 = ext4_journal_stop(handle); if (err2 && !err) err = err2; pwsalt_err_exit: mnt_drop_write_file(filp); if (err) return err; } if (copy_to_user((void __user *) arg, sbi->s_es->s_encrypt_pw_salt, 16)) return -EFAULT; return 0; #else return -EOPNOTSUPP; #endif } case EXT4_IOC_GET_ENCRYPTION_POLICY: return fscrypt_ioctl_get_policy(filp, (void __user *)arg); case EXT4_IOC_FSGETXATTR: { struct fsxattr fa; memset(&fa, 0, sizeof(struct fsxattr)); fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE); if (ext4_has_feature_project(inode->i_sb)) { fa.fsx_projid = (__u32)from_kprojid(&init_user_ns, EXT4_I(inode)->i_projid); } if (copy_to_user((struct fsxattr __user *)arg, &fa, sizeof(fa))) return -EFAULT; return 0; } case EXT4_IOC_FSSETXATTR: { struct fsxattr fa; int err; if (copy_from_user(&fa, (struct fsxattr __user *)arg, sizeof(fa))) return -EFAULT; /* Make sure caller has proper permission */ if (!inode_owner_or_capable(inode)) return -EACCES; if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS) return -EOPNOTSUPP; flags = ext4_xflags_to_iflags(fa.fsx_xflags); if (ext4_mask_flags(inode->i_mode, flags) != flags) return -EOPNOTSUPP; err = mnt_want_write_file(filp); if (err) return err; inode_lock(inode); flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) | (flags & EXT4_FL_XFLAG_VISIBLE); err = ext4_ioctl_setflags(inode, flags); inode_unlock(inode); mnt_drop_write_file(filp); if (err) return err; err = ext4_ioctl_setproject(filp, fa.fsx_projid); if (err) return err; return 0; } case EXT4_IOC_SHUTDOWN: return ext4_shutdown(sb, arg); default: return -ENOTTY; } }
/* * NOTE! When we get the inode, we're the only people * that have access to it, and as such there are no * race conditions we have to worry about. The inode * is not on the hash-lists, and it cannot be reached * through the filesystem because the directory entry * has been deleted earlier. * * HOWEVER: we must make sure that we get no aliases, * which means that we have to call "clear_inode()" * _before_ we mark the inode not in use in the inode * bitmaps. Otherwise a newly created file might use * the same inode number (not actually the same pointer * though), and then we'd have two inodes sharing the * same inode number and space on the harddisk. */ void ext4_free_inode (handle_t *handle, struct inode * inode) { struct super_block * sb = inode->i_sb; int is_directory; unsigned long ino; struct buffer_head *bitmap_bh = NULL; struct buffer_head *bh2; unsigned long block_group; unsigned long bit; struct ext4_group_desc * gdp; struct ext4_super_block * es; struct ext4_sb_info *sbi; int fatal = 0, err; if (atomic_read(&inode->i_count) > 1) { printk ("ext4_free_inode: inode has count=%d\n", atomic_read(&inode->i_count)); return; } if (inode->i_nlink) { printk ("ext4_free_inode: inode has nlink=%d\n", inode->i_nlink); return; } if (!sb) { printk("ext4_free_inode: inode on nonexistent device\n"); return; } sbi = EXT4_SB(sb); ino = inode->i_ino; ext4_debug ("freeing inode %lu\n", ino); /* * Note: we must free any quota before locking the superblock, * as writing the quota to disk may need the lock as well. */ DQUOT_INIT(inode); ext4_xattr_delete_inode(handle, inode); DQUOT_FREE_INODE(inode); DQUOT_DROP(inode); is_directory = S_ISDIR(inode->i_mode); /* Do this BEFORE marking the inode not in use or returning an error */ clear_inode (inode); es = EXT4_SB(sb)->s_es; if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { ext4_error (sb, "ext4_free_inode", "reserved or nonexistent inode %lu", ino); goto error_return; } block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb); bit = (ino - 1) % EXT4_INODES_PER_GROUP(sb); bitmap_bh = read_inode_bitmap(sb, block_group); if (!bitmap_bh) goto error_return; BUFFER_TRACE(bitmap_bh, "get_write_access"); fatal = ext4_journal_get_write_access(handle, bitmap_bh); if (fatal) goto error_return; /* Ok, now we can actually update the inode bitmaps.. */ if (!ext4_clear_bit_atomic(sb_bgl_lock(sbi, block_group), bit, bitmap_bh->b_data)) ext4_error (sb, "ext4_free_inode", "bit already cleared for inode %lu", ino); else { gdp = ext4_get_group_desc (sb, block_group, &bh2); BUFFER_TRACE(bh2, "get_write_access"); fatal = ext4_journal_get_write_access(handle, bh2); if (fatal) goto error_return; if (gdp) { spin_lock(sb_bgl_lock(sbi, block_group)); gdp->bg_free_inodes_count = cpu_to_le16( le16_to_cpu(gdp->bg_free_inodes_count) + 1); if (is_directory) gdp->bg_used_dirs_count = cpu_to_le16( le16_to_cpu(gdp->bg_used_dirs_count) - 1); spin_unlock(sb_bgl_lock(sbi, block_group)); percpu_counter_inc(&sbi->s_freeinodes_counter); if (is_directory) percpu_counter_dec(&sbi->s_dirs_counter); } BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata"); err = ext4_journal_dirty_metadata(handle, bh2); if (!fatal) fatal = err; } BUFFER_TRACE(bitmap_bh, "call ext4_journal_dirty_metadata"); err = ext4_journal_dirty_metadata(handle, bitmap_bh); if (!fatal) fatal = err; sb->s_dirt = 1; error_return: brelse(bitmap_bh); ext4_std_error(sb, fatal); }
/* * There are two policies for allocating an inode. If the new inode is * a directory, then a forward search is made for a block group with both * free space and a low directory-to-inode ratio; if that fails, then of * the groups with above-average free space, that group with the fewest * directories already is chosen. * * For other inodes, search forward from the parent directory's block * group to find a free inode. */ struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode) { struct super_block *sb; struct buffer_head *bitmap_bh = NULL; struct buffer_head *bh2; int group; unsigned long ino = 0; struct inode * inode; struct ext4_group_desc * gdp = NULL; struct ext4_super_block * es; struct ext4_inode_info *ei; struct ext4_sb_info *sbi; int err = 0; struct inode *ret; int i; /* Cannot create files in a deleted directory */ if (!dir || !dir->i_nlink) return ERR_PTR(-EPERM); sb = dir->i_sb; inode = new_inode(sb); if (!inode) return ERR_PTR(-ENOMEM); ei = EXT4_I(inode); sbi = EXT4_SB(sb); es = sbi->s_es; if (S_ISDIR(mode)) { if (test_opt (sb, OLDALLOC)) group = find_group_dir(sb, dir); else group = find_group_orlov(sb, dir); } else group = find_group_other(sb, dir); err = -ENOSPC; if (group == -1) goto out; for (i = 0; i < sbi->s_groups_count; i++) { err = -EIO; gdp = ext4_get_group_desc(sb, group, &bh2); if (!gdp) goto fail; brelse(bitmap_bh); bitmap_bh = read_inode_bitmap(sb, group); if (!bitmap_bh) goto fail; ino = 0; repeat_in_this_group: ino = ext4_find_next_zero_bit((unsigned long *) bitmap_bh->b_data, EXT4_INODES_PER_GROUP(sb), ino); if (ino < EXT4_INODES_PER_GROUP(sb)) { BUFFER_TRACE(bitmap_bh, "get_write_access"); err = ext4_journal_get_write_access(handle, bitmap_bh); if (err) goto fail; if (!ext4_set_bit_atomic(sb_bgl_lock(sbi, group), ino, bitmap_bh->b_data)) { /* we won it */ BUFFER_TRACE(bitmap_bh, "call ext4_journal_dirty_metadata"); err = ext4_journal_dirty_metadata(handle, bitmap_bh); if (err) goto fail; goto got; } /* we lost it */ jbd2_journal_release_buffer(handle, bitmap_bh); if (++ino < EXT4_INODES_PER_GROUP(sb)) goto repeat_in_this_group; } /* * This case is possible in concurrent environment. It is very * rare. We cannot repeat the find_group_xxx() call because * that will simply return the same blockgroup, because the * group descriptor metadata has not yet been updated. * So we just go onto the next blockgroup. */ if (++group == sbi->s_groups_count) group = 0; } err = -ENOSPC; goto out; got: ino += group * EXT4_INODES_PER_GROUP(sb) + 1; if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) { ext4_error (sb, "ext4_new_inode", "reserved inode or inode > inodes count - " "block_group = %d, inode=%lu", group, ino); err = -EIO; goto fail; } BUFFER_TRACE(bh2, "get_write_access"); err = ext4_journal_get_write_access(handle, bh2); if (err) goto fail; spin_lock(sb_bgl_lock(sbi, group)); gdp->bg_free_inodes_count = cpu_to_le16(le16_to_cpu(gdp->bg_free_inodes_count) - 1); if (S_ISDIR(mode)) { gdp->bg_used_dirs_count = cpu_to_le16(le16_to_cpu(gdp->bg_used_dirs_count) + 1); } spin_unlock(sb_bgl_lock(sbi, group)); BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata"); err = ext4_journal_dirty_metadata(handle, bh2); if (err) goto fail; percpu_counter_dec(&sbi->s_freeinodes_counter); if (S_ISDIR(mode)) percpu_counter_inc(&sbi->s_dirs_counter); sb->s_dirt = 1; inode->i_uid = current->fsuid; if (test_opt (sb, GRPID)) inode->i_gid = dir->i_gid; else if (dir->i_mode & S_ISGID) { inode->i_gid = dir->i_gid; if (S_ISDIR(mode)) mode |= S_ISGID; } else inode->i_gid = current->fsgid; inode->i_mode = mode; inode->i_ino = ino; /* This is the optimal IO size (for stat), not the fs block size */ inode->i_blocks = 0; inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime = ext4_current_time(inode); memset(ei->i_data, 0, sizeof(ei->i_data)); ei->i_dir_start_lookup = 0; ei->i_disksize = 0; ei->i_flags = EXT4_I(dir)->i_flags & ~EXT4_INDEX_FL; if (S_ISLNK(mode)) ei->i_flags &= ~(EXT4_IMMUTABLE_FL|EXT4_APPEND_FL); /* dirsync only applies to directories */ if (!S_ISDIR(mode)) ei->i_flags &= ~EXT4_DIRSYNC_FL; #ifdef EXT4_FRAGMENTS ei->i_faddr = 0; ei->i_frag_no = 0; ei->i_frag_size = 0; #endif ei->i_file_acl = 0; ei->i_dir_acl = 0; ei->i_dtime = 0; ei->i_block_alloc_info = NULL; ei->i_block_group = group; ext4_set_inode_flags(inode); if (IS_DIRSYNC(inode)) handle->h_sync = 1; insert_inode_hash(inode); spin_lock(&sbi->s_next_gen_lock); inode->i_generation = sbi->s_next_generation++; spin_unlock(&sbi->s_next_gen_lock); ei->i_state = EXT4_STATE_NEW; ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize; ret = inode; if(DQUOT_ALLOC_INODE(inode)) { err = -EDQUOT; goto fail_drop; } err = ext4_init_acl(handle, inode, dir); if (err) goto fail_free_drop; err = ext4_init_security(handle,inode, dir); if (err) goto fail_free_drop; err = ext4_mark_inode_dirty(handle, inode); if (err) { ext4_std_error(sb, err); goto fail_free_drop; } if (test_opt(sb, EXTENTS)) { EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL; ext4_ext_tree_init(handle, inode); if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { err = ext4_journal_get_write_access(handle, EXT4_SB(sb)->s_sbh); if (err) goto fail; EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS); BUFFER_TRACE(EXT4_SB(sb)->s_sbh, "call ext4_journal_dirty_metadata"); err = ext4_journal_dirty_metadata(handle, EXT4_SB(sb)->s_sbh); } } ext4_debug("allocating inode %lu\n", inode->i_ino); goto really_out; fail: ext4_std_error(sb, err); out: iput(inode); ret = ERR_PTR(err); really_out: brelse(bitmap_bh); return ret; fail_free_drop: DQUOT_FREE_INODE(inode); fail_drop: DQUOT_DROP(inode); inode->i_flags |= S_NOQUOTA; inode->i_nlink = 0; iput(inode); brelse(bitmap_bh); return ERR_PTR(err); }
long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { struct inode *inode = filp->f_dentry->d_inode; struct ext4_inode_info *ei = EXT4_I(inode); unsigned int flags; ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); switch (cmd) { case EXT4_IOC_GETFLAGS: ext4_get_inode_flags(ei); flags = ei->i_flags & EXT4_FL_USER_VISIBLE; return put_user(flags, (int __user *) arg); case EXT4_IOC_SETFLAGS: { handle_t *handle = NULL; int err, migrate = 0; struct ext4_iloc iloc; unsigned int oldflags; unsigned int jflag; if (!is_owner_or_cap(inode)) return -EACCES; if (get_user(flags, (int __user *) arg)) return -EFAULT; err = mnt_want_write(filp->f_path.mnt); if (err) return err; if (!S_ISDIR(inode->i_mode)) flags &= ~EXT4_DIRSYNC_FL; err = -EPERM; mutex_lock(&inode->i_mutex); /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) goto flags_out; oldflags = ei->i_flags; /* The JOURNAL_DATA flag is modifiable only by root */ jflag = flags & EXT4_JOURNAL_DATA_FL; /* * The IMMUTABLE and APPEND_ONLY flags can only be changed by * the relevant capability. * * This test looks nicer. Thanks to Pauline Middelink */ if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { if (!capable(CAP_LINUX_IMMUTABLE)) goto flags_out; } /* * The JOURNAL_DATA flag can only be changed by * the relevant capability. */ if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { if (!capable(CAP_SYS_RESOURCE)) goto flags_out; } if (oldflags & EXT4_EXTENTS_FL) { /* We don't support clearning extent flags */ if (!(flags & EXT4_EXTENTS_FL)) { err = -EOPNOTSUPP; goto flags_out; } } else if (flags & EXT4_EXTENTS_FL) { /* migrate the file */ migrate = 1; flags &= ~EXT4_EXTENTS_FL; } handle = ext4_journal_start(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; flags = flags & EXT4_FL_USER_MODIFIABLE; flags |= oldflags & ~EXT4_FL_USER_MODIFIABLE; ei->i_flags = flags; ext4_set_inode_flags(inode); inode->i_ctime = ext4_current_time(inode); err = ext4_mark_iloc_dirty(handle, inode, &iloc); flags_err: ext4_journal_stop(handle); if (err) goto flags_out; if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) err = ext4_change_inode_journal_flag(inode, jflag); if (err) goto flags_out; if (migrate) err = ext4_ext_migrate(inode); flags_out: mutex_unlock(&inode->i_mutex); mnt_drop_write(filp->f_path.mnt); return err; } 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 (!is_owner_or_cap(inode)) return -EPERM; err = mnt_want_write(filp->f_path.mnt); if (err) return err; if (get_user(generation, (int __user *) arg)) { err = -EFAULT; goto setversion_out; } handle = ext4_journal_start(inode, 1); if (IS_ERR(handle)) { err = PTR_ERR(handle); goto setversion_out; } err = ext4_reserve_inode_write(handle, inode, &iloc); if (err == 0) { inode->i_ctime = ext4_current_time(inode); inode->i_generation = generation; err = ext4_mark_iloc_dirty(handle, inode, &iloc); } ext4_journal_stop(handle); setversion_out: mnt_drop_write(filp->f_path.mnt); return err; } #ifdef CONFIG_JBD2_DEBUG case EXT4_IOC_WAIT_FOR_READONLY: /* * This is racy - by the time we're woken up and running, * the superblock could be released. And the module could * have been unloaded. So sue me. * * Returns 1 if it slept, else zero. */ { struct super_block *sb = inode->i_sb; DECLARE_WAITQUEUE(wait, current); int ret = 0; set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); if (timer_pending(&EXT4_SB(sb)->turn_ro_timer)) { schedule(); ret = 1; } remove_wait_queue(&EXT4_SB(sb)->ro_wait_queue, &wait); return ret; } #endif case EXT4_IOC_GROUP_EXTEND: { ext4_fsblk_t n_blocks_count; struct super_block *sb = inode->i_sb; int err, err2; if (!capable(CAP_SYS_RESOURCE)) return -EPERM; if (get_user(n_blocks_count, (__u32 __user *)arg)) return -EFAULT; err = mnt_want_write(filp->f_path.mnt); if (err) return err; err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); if (err == 0) err = err2; mnt_drop_write(filp->f_path.mnt); return err; } case EXT4_IOC_GROUP_ADD: { struct ext4_new_group_data input; struct super_block *sb = inode->i_sb; int err, err2; if (!capable(CAP_SYS_RESOURCE)) return -EPERM; if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, sizeof(input))) return -EFAULT; err = mnt_want_write(filp->f_path.mnt); if (err) return err; err = ext4_group_add(sb, &input); jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); if (err == 0) err = err2; mnt_drop_write(filp->f_path.mnt); return err; } case EXT4_IOC_MIGRATE: { int err; if (!is_owner_or_cap(inode)) return -EACCES; err = mnt_want_write(filp->f_path.mnt); 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. */ mutex_lock(&(inode->i_mutex)); err = ext4_ext_migrate(inode); mutex_unlock(&(inode->i_mutex)); mnt_drop_write(filp->f_path.mnt); return err; } default: return -ENOTTY; } }