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udf: Protect truncate and file type conversion with invalidate_lock

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Protect truncate and file type conversion in udf_file_write_iter() with
invalidate lock. That will allow us to serialize these paths with page
faults so that the page fault can determine the file type in a racefree
way.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2023-01-19 12:46:09 +01:00
parent 96eeaaaea5
commit b9a861fd52
2 changed files with 11 additions and 6 deletions
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2
fs/udf/file.c
View File

@ -150,7 +150,9 @@ static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB &&
inode->i_sb->s_blocksize < (udf_file_entry_alloc_offset(inode) +
iocb->ki_pos + iov_iter_count(from))) {
filemap_invalidate_lock(inode->i_mapping);
retval = udf_expand_file_adinicb(inode);
filemap_invalidate_unlock(inode->i_mapping);
if (retval)
goto out;
}

15
fs/udf/inode.c
View File

@ -1145,7 +1145,7 @@ struct buffer_head *udf_bread(struct inode *inode, udf_pblk_t block,
int udf_setsize(struct inode *inode, loff_t newsize)
{
int err;
int err = 0;
struct udf_inode_info *iinfo;
unsigned int bsize = i_blocksize(inode);
@ -1155,6 +1155,7 @@ int udf_setsize(struct inode *inode, loff_t newsize)
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
return -EPERM;
filemap_invalidate_lock(inode->i_mapping);
iinfo = UDF_I(inode);
if (newsize > inode->i_size) {
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
@ -1167,11 +1168,11 @@ int udf_setsize(struct inode *inode, loff_t newsize)
}
err = udf_expand_file_adinicb(inode);
if (err)
return err;
goto out_unlock;
}
err = udf_extend_file(inode, newsize);
if (err)
return err;
goto out_unlock;
set_size:
truncate_setsize(inode, newsize);
} else {
@ -1189,14 +1190,14 @@ set_size:
err = block_truncate_page(inode->i_mapping, newsize,
udf_get_block);
if (err)
return err;
goto out_unlock;
truncate_setsize(inode, newsize);
down_write(&iinfo->i_data_sem);
udf_clear_extent_cache(inode);
err = udf_truncate_extents(inode);
up_write(&iinfo->i_data_sem);
if (err)
return err;
goto out_unlock;
}
update_time:
inode->i_mtime = inode->i_ctime = current_time(inode);
@ -1204,7 +1205,9 @@ update_time:
udf_sync_inode(inode);
else
mark_inode_dirty(inode);
return 0;
out_unlock:
filemap_invalidate_unlock(inode->i_mapping);
return err;
}
/*