These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / fs / ext4 / symlink.c

diff --git a/kernel/fs/ext4/symlink.c b/kernel/fs/ext4/symlink.c
index 187b789..e8e7af6 100644 (file)
--- a/kernel/fs/ext4/symlink.c
+++ b/kernel/fs/ext4/symlink.c
@@ -23,34 +23,28 @@
 #include "xattr.h"
 
 #ifdef CONFIG_EXT4_FS_ENCRYPTION
-static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
+static const char *ext4_encrypted_follow_link(struct dentry *dentry, void **cookie)
 {
        struct page *cpage = NULL;
        char *caddr, *paddr = NULL;
        struct ext4_str cstr, pstr;
        struct inode *inode = d_inode(dentry);
-       struct ext4_fname_crypto_ctx *ctx = NULL;
        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 (!ext4_encrypted_inode(inode))
-               return page_follow_link_light(dentry, nd);
-
-       ctx = ext4_get_fname_crypto_ctx(inode, inode->i_sb->s_blocksize);
-       if (IS_ERR(ctx))
-               return ctx;
+       res = ext4_get_encryption_info(inode);
+       if (res)
+               return ERR_PTR(res);
 
        if (ext4_inode_is_fast_symlink(inode)) {
                caddr = (char *) EXT4_I(inode)->i_data;
                max_size = sizeof(EXT4_I(inode)->i_data);
        } else {
                cpage = read_mapping_page(inode->i_mapping, 0, NULL);
-               if (IS_ERR(cpage)) {
-                       ext4_put_fname_crypto_ctx(&ctx);
-                       return cpage;
-               }
+               if (IS_ERR(cpage))
+                       return ERR_CAST(cpage);
                caddr = kmap(cpage);
                caddr[size] = 0;
        }
@@ -58,12 +52,12 @@ static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
        /* Symlink is encrypted */
        sd = (struct ext4_encrypted_symlink_data *)caddr;
        cstr.name = sd->encrypted_path;
-       cstr.len  = le32_to_cpu(sd->len);
+       cstr.len  = le16_to_cpu(sd->len);
        if ((cstr.len +
             sizeof(struct ext4_encrypted_symlink_data) - 1) >
            max_size) {
                /* Symlink data on the disk is corrupted */
-               res = -EIO;
+               res = -EFSCORRUPTED;
                goto errout;
        }
        plen = (cstr.len < EXT4_FNAME_CRYPTO_DIGEST_SIZE*2) ?
@@ -74,21 +68,19 @@ static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
                goto errout;
        }
        pstr.name = paddr;
-       res = _ext4_fname_disk_to_usr(ctx, NULL, &cstr, &pstr);
+       pstr.len = plen;
+       res = _ext4_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
        if (res < 0)
                goto errout;
        /* Null-terminate the name */
        if (res <= plen)
                paddr[res] = '\0';
-       nd_set_link(nd, paddr);
-       ext4_put_fname_crypto_ctx(&ctx);
        if (cpage) {
                kunmap(cpage);
                page_cache_release(cpage);
        }
-       return NULL;
+       return *cookie = paddr;
 errout:
-       ext4_put_fname_crypto_ctx(&ctx);
        if (cpage) {
                kunmap(cpage);
                page_cache_release(cpage);
@@ -97,36 +89,22 @@ errout:
        return ERR_PTR(res);
 }
 
-static void ext4_put_link(struct dentry *dentry, struct nameidata *nd,
-                         void *cookie)
-{
-       struct page *page = cookie;
-
-       if (!page) {
-               kfree(nd_get_link(nd));
-       } else {
-               kunmap(page);
-               page_cache_release(page);
-       }
-}
+const struct inode_operations ext4_encrypted_symlink_inode_operations = {
+       .readlink       = generic_readlink,
+       .follow_link    = ext4_encrypted_follow_link,
+       .put_link       = kfree_put_link,
+       .setattr        = ext4_setattr,
+       .setxattr       = generic_setxattr,
+       .getxattr       = generic_getxattr,
+       .listxattr      = ext4_listxattr,
+       .removexattr    = generic_removexattr,
+};
 #endif
 
-static void *ext4_follow_fast_link(struct dentry *dentry, struct nameidata *nd)
-{
-       struct ext4_inode_info *ei = EXT4_I(d_inode(dentry));
-       nd_set_link(nd, (char *) ei->i_data);
-       return NULL;
-}
-
 const struct inode_operations ext4_symlink_inode_operations = {
        .readlink       = generic_readlink,
-#ifdef CONFIG_EXT4_FS_ENCRYPTION
-       .follow_link    = ext4_follow_link,
-       .put_link       = ext4_put_link,
-#else
        .follow_link    = page_follow_link_light,
        .put_link       = page_put_link,
-#endif
        .setattr        = ext4_setattr,
        .setxattr       = generic_setxattr,
        .getxattr       = generic_getxattr,
@@ -136,7 +114,7 @@ const struct inode_operations ext4_symlink_inode_operations = {
 
 const struct inode_operations ext4_fast_symlink_inode_operations = {
        .readlink       = generic_readlink,
-       .follow_link    = ext4_follow_fast_link,
+       .follow_link    = simple_follow_link,
        .setattr        = ext4_setattr,
        .setxattr       = generic_setxattr,
        .getxattr       = generic_getxattr,