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udf: Push i_data_sem locking into udf_expand_file_adinicb()

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The checks we do in udf_setsize() and udf_file_write_iter() are safe to
do only with i_rwsem locked as it stabilizes both file type and file
size. Hence we don't need to lock i_data_sem before we enter
udf_expand_file_adinicb() which simplifies the locking somewhat.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2023-01-19 12:28:37 +01:00
parent f950fd0529
commit 6a3b37e0ea
2 changed files with 11 additions and 18 deletions
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11
fs/udf/file.c
View file

@ -148,7 +148,6 @@ static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (retval <= 0)
goto out;
down_write(&iinfo->i_data_sem);
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))) {
@ -158,15 +157,15 @@ static ssize_t udf_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
udf_debug("udf_expand_adinicb: err=%d\n", err);
return err;
}
} else
up_write(&iinfo->i_data_sem);
}
retval = __generic_file_write_iter(iocb, from);
out:
down_write(&iinfo->i_data_sem);
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && retval > 0)
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB && retval > 0) {
down_write(&iinfo->i_data_sem);
iinfo->i_lenAlloc = inode->i_size;
up_write(&iinfo->i_data_sem);
up_write(&iinfo->i_data_sem);
}
inode_unlock(inode);
if (retval > 0) {

18
fs/udf/inode.c
View file

@ -247,7 +247,6 @@ const struct address_space_operations udf_aops = {
/*
* Expand file stored in ICB to a normal one-block-file
*
* This function requires i_data_sem for writing and releases it.
* This function requires i_mutex held
*/
int udf_expand_file_adinicb(struct inode *inode)
@ -259,6 +258,7 @@ int udf_expand_file_adinicb(struct inode *inode)
WARN_ON_ONCE(!inode_is_locked(inode));
if (!iinfo->i_lenAlloc) {
down_write(&iinfo->i_data_sem);
if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
else
@ -269,11 +269,6 @@ int udf_expand_file_adinicb(struct inode *inode)
mark_inode_dirty(inode);
return 0;
}
/*
* Release i_data_sem so that we can lock a page - page lock ranks
* above i_data_sem. i_mutex still protects us against file changes.
*/
up_write(&iinfo->i_data_sem);
page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
if (!page)
@ -1160,19 +1155,18 @@ int udf_setsize(struct inode *inode, loff_t newsize)
iinfo = UDF_I(inode);
if (newsize > inode->i_size) {
down_write(&iinfo->i_data_sem);
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
if (bsize <
if (bsize >=
(udf_file_entry_alloc_offset(inode) + newsize)) {
err = udf_expand_file_adinicb(inode);
if (err)
return err;
down_write(&iinfo->i_data_sem);
} else {
iinfo->i_lenAlloc = newsize;
goto set_size;
}
err = udf_expand_file_adinicb(inode);
if (err)
return err;
}
down_write(&iinfo->i_data_sem);
err = udf_extend_file(inode, newsize);
if (err) {
up_write(&iinfo->i_data_sem);