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authorAl Viro <viro@zeniv.linux.org.uk>2015-11-17 09:07:57 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-09 06:41:36 +0300
commit21fc61c73c3903c4c312d0802da01ec2b323d174 (patch)
treea26c29e3fbb766f00b023724e9e5b8b9bba9b879 /fs/affs
parentaa80deab33a8fb180e718f5e45514db19aade165 (diff)
downloadlinux-21fc61c73c3903c4c312d0802da01ec2b323d174.tar.xz
don't put symlink bodies in pagecache into highmem
kmap() in page_follow_link_light() needed to go - allowing to hold an arbitrary number of kmaps for long is a great way to deadlocking the system. new helper (inode_nohighmem(inode)) needs to be used for pagecache symlinks inodes; done for all in-tree cases. page_follow_link_light() instrumented to yell about anything missed. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/affs')
-rw-r--r--fs/affs/inode.c1
-rw-r--r--fs/affs/namei.c1
-rw-r--r--fs/affs/symlink.c4
3 files changed, 3 insertions, 3 deletions
diff --git a/fs/affs/inode.c b/fs/affs/inode.c
index 17349500592d..0fdb0f5b2239 100644
--- a/fs/affs/inode.c
+++ b/fs/affs/inode.c
@@ -140,6 +140,7 @@ struct inode *affs_iget(struct super_block *sb, unsigned long ino)
break;
case ST_SOFTLINK:
inode->i_mode |= S_IFLNK;
+ inode_nohighmem(inode);
inode->i_op = &affs_symlink_inode_operations;
inode->i_data.a_ops = &affs_symlink_aops;
break;
diff --git a/fs/affs/namei.c b/fs/affs/namei.c
index 181e05b46e72..00d3002a6780 100644
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
@@ -344,6 +344,7 @@ affs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
return -ENOSPC;
inode->i_op = &affs_symlink_inode_operations;
+ inode_nohighmem(inode);
inode->i_data.a_ops = &affs_symlink_aops;
inode->i_mode = S_IFLNK | 0777;
mode_to_prot(inode);
diff --git a/fs/affs/symlink.c b/fs/affs/symlink.c
index ea5b69a18ba9..e3f9dc3ae8cc 100644
--- a/fs/affs/symlink.c
+++ b/fs/affs/symlink.c
@@ -14,7 +14,7 @@ static int affs_symlink_readpage(struct file *file, struct page *page)
{
struct buffer_head *bh;
struct inode *inode = page->mapping->host;
- char *link = kmap(page);
+ char *link = page_address(page);
struct slink_front *lf;
int i, j;
char c;
@@ -57,12 +57,10 @@ static int affs_symlink_readpage(struct file *file, struct page *page)
link[i] = '\0';
affs_brelse(bh);
SetPageUptodate(page);
- kunmap(page);
unlock_page(page);
return 0;
fail:
SetPageError(page);
- kunmap(page);
unlock_page(page);
return -EIO;
}