A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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don't put symlink bodies in pagecache into highmem

Browse source 
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 <[email protected]>
This commit is contained in:
Al Viro 2015-11-17 01:07:57 -05:00
commit 21fc61c73c
57 changed files with 81 additions and 46 deletions
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1
fs/jfs/inode.c
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@ -60,6 +60,7 @@ struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
} else if (S_ISLNK(inode->i_mode)) {
if (inode->i_size >= IDATASIZE) {
inode->i_op = &page_symlink_inode_operations;
inode_nohighmem(inode);
inode->i_mapping->a_ops = &jfs_aops;
} else {
inode->i_op = &jfs_fast_symlink_inode_operations;

1
fs/jfs/namei.c
View file

@ -983,6 +983,7 @@ static int jfs_symlink(struct inode *dip, struct dentry *dentry,
jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
ip->i_op = &jfs_symlink_inode_operations;
inode_nohighmem(ip);
ip->i_mapping->a_ops = &jfs_aops;
/*