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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/isofs
parentaa80deab33a8fb180e718f5e45514db19aade165 (diff)
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/isofs')
-rw-r--r--fs/isofs/inode.c1
-rw-r--r--fs/isofs/rock.c4
2 files changed, 2 insertions, 3 deletions
diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index d67a16f2a45d..61abdc4920da 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -1417,6 +1417,7 @@ static int isofs_read_inode(struct inode *inode, int relocated)
inode->i_fop = &isofs_dir_operations;
} else if (S_ISLNK(inode->i_mode)) {
inode->i_op = &page_symlink_inode_operations;
+ inode_nohighmem(inode);
inode->i_data.a_ops = &isofs_symlink_aops;
} else
/* XXX - parse_rock_ridge_inode() had already set i_rdev. */
diff --git a/fs/isofs/rock.c b/fs/isofs/rock.c
index 735d7522a3a9..5384ceb35b1c 100644
--- a/fs/isofs/rock.c
+++ b/fs/isofs/rock.c
@@ -687,7 +687,7 @@ static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
struct inode *inode = page->mapping->host;
struct iso_inode_info *ei = ISOFS_I(inode);
struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb);
- char *link = kmap(page);
+ char *link = page_address(page);
unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
struct buffer_head *bh;
char *rpnt = link;
@@ -774,7 +774,6 @@ repeat:
brelse(bh);
*rpnt = '\0';
SetPageUptodate(page);
- kunmap(page);
unlock_page(page);
return 0;
@@ -791,7 +790,6 @@ fail:
brelse(bh);
error:
SetPageError(page);
- kunmap(page);
unlock_page(page);
return -EIO;
}