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authorAl Viro <viro@zeniv.linux.org.uk>2015-11-17 01:07:57 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2015-12-08 22:41:36 -0500
commit21fc61c73c3903c4c312d0802da01ec2b323d174 (patch)
treea26c29e3fbb766f00b023724e9e5b8b9bba9b879 /fs/coda
parentaa80deab33a8fb180e718f5e45514db19aade165 (diff)
downloadlinux-stericsson-21fc61c73c3903c4c312d0802da01ec2b323d174.tar.gz
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/coda')
-rw-r--r--fs/coda/cnode.c2
-rw-r--r--fs/coda/symlink.c4
2 files changed, 3 insertions, 3 deletions
diff --git a/fs/coda/cnode.c b/fs/coda/cnode.c
index 7740b1c871c1..dd6a79ef4750 100644
--- a/fs/coda/cnode.c
+++ b/fs/coda/cnode.c
@@ -8,6 +8,7 @@
#include <linux/coda.h>
#include <linux/coda_psdev.h>
+#include <linux/pagemap.h>
#include "coda_linux.h"
static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
@@ -35,6 +36,7 @@ static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr)
inode->i_fop = &coda_dir_operations;
} else if (S_ISLNK(inode->i_mode)) {
inode->i_op = &coda_symlink_inode_operations;
+ inode_nohighmem(inode);
inode->i_data.a_ops = &coda_symlink_aops;
inode->i_mapping = &inode->i_data;
} else
diff --git a/fs/coda/symlink.c b/fs/coda/symlink.c
index ab94ef63caef..03736e20d720 100644
--- a/fs/coda/symlink.c
+++ b/fs/coda/symlink.c
@@ -26,7 +26,7 @@ static int coda_symlink_filler(struct file *file, struct page *page)
int error;
struct coda_inode_info *cii;
unsigned int len = PAGE_SIZE;
- char *p = kmap(page);
+ char *p = page_address(page);
cii = ITOC(inode);
@@ -34,13 +34,11 @@ static int coda_symlink_filler(struct file *file, struct page *page)
if (error)
goto fail;
SetPageUptodate(page);
- kunmap(page);
unlock_page(page);
return 0;
fail:
SetPageError(page);
- kunmap(page);
unlock_page(page);
return error;
}