diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-11-17 10:54:32 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-12-08 22:41:55 -0500 |
| commit | 6a6c99049635473b64c384135a6906a10df2c916 (patch) | |
| tree | 6ecb841fe51e0643f37db146f14f374a9470a21e | |
| parent | d3883d4f93449343be6296e2274360db39b6842a (diff) | |
teach shmem_get_link() to work in RCU mode
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | mm/shmem.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 684dbc32e233..0605716aee06 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2501,12 +2501,20 @@ static const char *shmem_get_link(struct dentry *dentry, { struct page *page = NULL; int error; - if (!dentry) - return ERR_PTR(-ECHILD); - error = shmem_getpage(inode, 0, &page, SGP_READ, NULL); - if (error) - return ERR_PTR(error); - unlock_page(page); + if (!dentry) { + page = find_get_page(inode->i_mapping, 0); + if (!page) + return ERR_PTR(-ECHILD); + if (!PageUptodate(page)) { + put_page(page); + return ERR_PTR(-ECHILD); + } + } else { + error = shmem_getpage(inode, 0, &page, SGP_READ, NULL); + if (error) + return ERR_PTR(error); + unlock_page(page); + } *cookie = page; return page_address(page); } |