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>
2026-10-22 19:14:51 +00:00 · 2015-11-17 01:07:57 -05:00 · 2015-11-17 01:07:57 -05:00 · 21fc61c73c
commit 21fc61c73c
parent aa80deab33
57 changed files with 81 additions and 46 deletions
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
--- a/fs/affs/inode.c
+++ b/fs/affs/inode.c
--- a/fs/affs/namei.c
+++ b/fs/affs/namei.c
--- a/fs/affs/symlink.c
+++ b/fs/affs/symlink.c
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
--- a/fs/coda/cnode.c
+++ b/fs/coda/cnode.c
--- a/fs/coda/symlink.c
+++ b/fs/coda/symlink.c
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
--- a/fs/efs/inode.c
+++ b/fs/efs/inode.c
--- a/fs/efs/symlink.c
+++ b/fs/efs/symlink.c
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
--- a/fs/exofs/namei.c
+++ b/fs/exofs/namei.c
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
--- a/fs/freevxfs/vxfs_inode.c
+++ b/fs/freevxfs/vxfs_inode.c
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
--- a/fs/hpfs/inode.c
+++ b/fs/hpfs/inode.c
--- a/fs/hpfs/namei.c
+++ b/fs/hpfs/namei.c
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
--- a/fs/inode.c
+++ b/fs/inode.c
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
--- a/fs/logfs/dir.c
+++ b/fs/logfs/dir.c
--- a/fs/logfs/inode.c
+++ b/fs/logfs/inode.c
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
--- a/fs/namei.c
+++ b/fs/namei.c
--- a/fs/ncpfs/inode.c
+++ b/fs/ncpfs/inode.c
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
--- a/fs/nfs/symlink.c
+++ b/fs/nfs/symlink.c
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
--- a/fs/qnx4/inode.c
+++ b/fs/qnx4/inode.c
--- a/fs/qnx6/inode.c
+++ b/fs/qnx6/inode.c
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
--- a/fs/squashfs/inode.c
+++ b/fs/squashfs/inode.c
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
--- a/fs/udf/symlink.c
+++ b/fs/udf/symlink.c
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
--- a/mm/shmem.c
+++ b/mm/shmem.c