udf: Replace bkl with the UDF_I(inode)->i_data_sem for protect udf_inode_info struct
Replace bkl with the UDF_I(inode)->i_data_sem rw semaphore in
udf_release_file(), udf_symlink(), udf_symlink_filler(), udf_get_block(),
udf_block_map(), and udf_setattr(). The rule now is that any operation
on regular file's or symlink's extents (or generally allocation information
including goal block) needs to hold i_data_sem.
This work was supported by a hardware donation from the CE Linux Forum.
Signed-off-by: Alessio Igor Bogani <abogani@texware.it>
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index fa3c154..b2fe4d7 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -301,10 +301,9 @@
err = -EIO;
new = 0;
bh = NULL;
-
- lock_kernel();
-
iinfo = UDF_I(inode);
+
+ down_write(&iinfo->i_data_sem);
if (block == iinfo->i_next_alloc_block + 1) {
iinfo->i_next_alloc_block++;
iinfo->i_next_alloc_goal++;
@@ -323,7 +322,7 @@
map_bh(bh_result, inode->i_sb, phys);
abort:
- unlock_kernel();
+ up_write(&iinfo->i_data_sem);
return err;
}
@@ -1021,16 +1020,16 @@
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
return;
- lock_kernel();
iinfo = UDF_I(inode);
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
+ down_write(&iinfo->i_data_sem);
if (inode->i_sb->s_blocksize <
(udf_file_entry_alloc_offset(inode) +
inode->i_size)) {
udf_expand_file_adinicb(inode, inode->i_size, &err);
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
inode->i_size = iinfo->i_lenAlloc;
- unlock_kernel();
+ up_write(&iinfo->i_data_sem);
return;
} else
udf_truncate_extents(inode);
@@ -1041,10 +1040,13 @@
offset - udf_file_entry_alloc_offset(inode));
iinfo->i_lenAlloc = inode->i_size;
}
+ up_write(&iinfo->i_data_sem);
} else {
block_truncate_page(inode->i_mapping, inode->i_size,
udf_get_block);
+ down_write(&iinfo->i_data_sem);
udf_truncate_extents(inode);
+ up_write(&iinfo->i_data_sem);
}
inode->i_mtime = inode->i_ctime = current_fs_time(inode->i_sb);
@@ -1052,7 +1054,6 @@
udf_sync_inode(inode);
else
mark_inode_dirty(inode);
- unlock_kernel();
}
static void __udf_read_inode(struct inode *inode)
@@ -2043,7 +2044,7 @@
struct extent_position epos = {};
int ret;
- lock_kernel();
+ down_read(&UDF_I(inode)->i_data_sem);
if (inode_bmap(inode, block, &epos, &eloc, &elen, &offset) ==
(EXT_RECORDED_ALLOCATED >> 30))
@@ -2051,7 +2052,7 @@
else
ret = 0;
- unlock_kernel();
+ up_read(&UDF_I(inode)->i_data_sem);
brelse(epos.bh);
if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_VARCONV))