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ext4: Use page_symlink() instead of __page_symlink() 

By using the memalloc_nofs_save() functionality, we can call
page_symlink(), safe in the knowledge that it won't recurse into the
filesystem.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Matthew Wilcox (Oracle) 2022-02-22 09:27:42 -05:00
parent 5fb9bfe01c
commit a125d2aec3
1 changed files with 6 additions and 1 deletions
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7
fs/ext4/namei.c
View File

@ -29,6 +29,7 @@
#include <linux/pagemap.h>
#include <linux/time.h>
#include <linux/fcntl.h>
#include <linux/sched/mm.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/quotaops.h>
@ -3308,6 +3309,8 @@ static int ext4_symlink(struct user_namespace *mnt_userns, struct inode *dir,
}
if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
unsigned int flags;
if (!IS_ENCRYPTED(inode))
inode->i_op = &ext4_symlink_inode_operations;
inode_nohighmem(inode);
@ -3329,7 +3332,9 @@ static int ext4_symlink(struct user_namespace *mnt_userns, struct inode *dir,
handle = NULL;
if (err)
goto err_drop_inode;
err = __page_symlink(inode, disk_link.name, disk_link.len, 1);
flags = memalloc_nofs_save();
err = page_symlink(inode, disk_link.name, disk_link.len);
memalloc_nofs_restore(flags);
if (err)
goto err_drop_inode;
/*