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/symlink.c b/fs/udf/symlink.c
index 1606478..b1d4488 100644
--- a/fs/udf/symlink.c
+++ b/fs/udf/symlink.c
@@ -27,7 +27,6 @@
#include <linux/mm.h>
#include <linux/stat.h>
#include <linux/pagemap.h>
-#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include "udf_i.h"
@@ -78,13 +77,16 @@
int err = -EIO;
unsigned char *p = kmap(page);
struct udf_inode_info *iinfo;
+ uint32_t pos;
- lock_kernel();
iinfo = UDF_I(inode);
+ pos = udf_block_map(inode, 0);
+
+ down_read(&iinfo->i_data_sem);
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB) {
symlink = iinfo->i_ext.i_data + iinfo->i_lenEAttr;
} else {
- bh = sb_bread(inode->i_sb, udf_block_map(inode, 0));
+ bh = sb_bread(inode->i_sb, pos);
if (!bh)
goto out;
@@ -95,14 +97,14 @@
udf_pc_to_char(inode->i_sb, symlink, inode->i_size, p);
brelse(bh);
- unlock_kernel();
+ up_read(&iinfo->i_data_sem);
SetPageUptodate(page);
kunmap(page);
unlock_page(page);
return 0;
out:
- unlock_kernel();
+ up_read(&iinfo->i_data_sem);
SetPageError(page);
kunmap(page);
unlock_page(page);