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/isofs/inode.c
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@ -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. */

4
fs/isofs/rock.c
View file

@ -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;
}