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authorLinus Torvalds <torvalds@linux-foundation.org>2016-01-11 13:13:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-11 13:13:23 -0800
commit32fb378437a1d716e72a442237d7ead1f435ecf0 (patch)
tree411b25023d4df908fb8ca4517185d49c37c51e10 /fs/ext4/symlink.c
parent19ccb28e296d5afa299db1003d37e5d37994d46e (diff)
parentfceef393a538134f03b778c5d2519e670269342f (diff)
Merge branch 'work.symlinks' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs RCU symlink updates from Al Viro: "Replacement of ->follow_link/->put_link, allowing to stay in RCU mode even if the symlink is not an embedded one. No changes since the mailbomb on Jan 1" * 'work.symlinks' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: switch ->get_link() to delayed_call, kill ->put_link() kill free_page_put_link() teach nfs_get_link() to work in RCU mode teach proc_self_get_link()/proc_thread_self_get_link() to work in RCU mode teach shmem_get_link() to work in RCU mode teach page_get_link() to work in RCU mode replace ->follow_link() with new method that could stay in RCU mode don't put symlink bodies in pagecache into highmem namei: page_getlink() and page_follow_link_light() are the same thing ufs: get rid of ->setattr() for symlinks udf: don't duplicate page_symlink_inode_operations logfs: don't duplicate page_symlink_inode_operations switch befs long symlinks to page_symlink_operations
Diffstat (limited to 'fs/ext4/symlink.c')
-rw-r--r--fs/ext4/symlink.c29
1 files changed, 14 insertions, 15 deletions
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index e8e7af62ac95..6f7ee30a89ce 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -23,17 +23,21 @@
#include "xattr.h"
#ifdef CONFIG_EXT4_FS_ENCRYPTION
-static const char *ext4_encrypted_follow_link(struct dentry *dentry, void **cookie)
+static const char *ext4_encrypted_get_link(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
{
struct page *cpage = NULL;
char *caddr, *paddr = NULL;
struct ext4_str cstr, pstr;
- struct inode *inode = d_inode(dentry);
struct ext4_encrypted_symlink_data *sd;
loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
int res;
u32 plen, max_size = inode->i_sb->s_blocksize;
+ if (!dentry)
+ return ERR_PTR(-ECHILD);
+
res = ext4_get_encryption_info(inode);
if (res)
return ERR_PTR(res);
@@ -45,7 +49,7 @@ static const char *ext4_encrypted_follow_link(struct dentry *dentry, void **cook
cpage = read_mapping_page(inode->i_mapping, 0, NULL);
if (IS_ERR(cpage))
return ERR_CAST(cpage);
- caddr = kmap(cpage);
+ caddr = page_address(cpage);
caddr[size] = 0;
}
@@ -75,24 +79,20 @@ static const char *ext4_encrypted_follow_link(struct dentry *dentry, void **cook
/* Null-terminate the name */
if (res <= plen)
paddr[res] = '\0';
- if (cpage) {
- kunmap(cpage);
+ if (cpage)
page_cache_release(cpage);
- }
- return *cookie = paddr;
+ set_delayed_call(done, kfree_link, paddr);
+ return paddr;
errout:
- if (cpage) {
- kunmap(cpage);
+ if (cpage)
page_cache_release(cpage);
- }
kfree(paddr);
return ERR_PTR(res);
}
const struct inode_operations ext4_encrypted_symlink_inode_operations = {
.readlink = generic_readlink,
- .follow_link = ext4_encrypted_follow_link,
- .put_link = kfree_put_link,
+ .get_link = ext4_encrypted_get_link,
.setattr = ext4_setattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
@@ -103,8 +103,7 @@ const struct inode_operations ext4_encrypted_symlink_inode_operations = {
const struct inode_operations ext4_symlink_inode_operations = {
.readlink = generic_readlink,
- .follow_link = page_follow_link_light,
- .put_link = page_put_link,
+ .get_link = page_get_link,
.setattr = ext4_setattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
@@ -114,7 +113,7 @@ const struct inode_operations ext4_symlink_inode_operations = {
const struct inode_operations ext4_fast_symlink_inode_operations = {
.readlink = generic_readlink,
- .follow_link = simple_follow_link,
+ .get_link = simple_get_link,
.setattr = ext4_setattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,