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udf: Avoid GFP_NOFS allocation in udf_symlink() 

The GFP_NOFS allocation in udf_symlink() is called only under
inode->i_rwsem and UDF_I(inode)->i_data_sem. The first is safe wrt
reclaim, the second should be as well but allocating unde this lock is
actually unnecessary. Move the allocation from under i_data_sem and
change it to GFP_KERNEL.

Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara 2024-01-09 11:06:57 +01:00
parent f6766303c0
commit 2ed0d3d4fe
1 changed files with 12 additions and 9 deletions
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21
fs/udf/namei.c
View File

@ -566,7 +566,7 @@ out:
static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, const char *symname)
{
struct inode *inode = udf_new_inode(dir, S_IFLNK | 0777);
struct inode *inode;
struct pathComponent *pc;
const char *compstart;
struct extent_position epos = {};
@ -579,17 +579,20 @@ static int udf_symlink(struct mnt_idmap *idmap, struct inode *dir,
struct udf_inode_info *iinfo;
struct super_block *sb = dir->i_sb;
if (IS_ERR(inode))
return PTR_ERR(inode);
name = kmalloc(UDF_NAME_LEN_CS0, GFP_KERNEL);
if (!name) {
err = -ENOMEM;
goto out;
}
inode = udf_new_inode(dir, S_IFLNK | 0777);
if (IS_ERR(inode)) {
err = PTR_ERR(inode);
goto out;
}
iinfo = UDF_I(inode);
down_write(&iinfo->i_data_sem);
name = kmalloc(UDF_NAME_LEN_CS0, GFP_NOFS);
if (!name) {
err = -ENOMEM;
goto out_no_entry;
}
inode->i_data.a_ops = &udf_symlink_aops;
inode->i_op = &udf_symlink_inode_operations;
inode_nohighmem(inode);