[PATCH] xip: ext2: execute in place

These are the ext2 related parts.  Ext2 now uses the xip_* file operations
along with the get_xip_page aop when mounted with -o xip.

Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 27 insertions, 4 deletions

diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index a50d9db4b6e..53dceb0c659 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -33,6 +33,7 @@
 #include <linux/mpage.h>
 #include "ext2.h"
 #include "acl.h"
+#include "xip.h"
 
 MODULE_AUTHOR("Remy Card and others");
 MODULE_DESCRIPTION("Second Extended Filesystem");
@@ -594,6 +595,16 @@ out:
         if (err)
                 goto cleanup;
 
+        if (ext2_use_xip(inode->i_sb)) {
+                /*
+                 * we need to clear the block
+                 */
+                err = ext2_clear_xip_target (inode,
+                        le32_to_cpu(chain[depth-1].key));
+                if (err)
+                        goto cleanup;
+        }
+
         if (ext2_splice_branch(inode, iblock, chain, partial, left) < 0)
                 goto changed;
 
@@ -691,6 +702,11 @@ struct address_space_operations ext2_aops = {
         .writepages             = ext2_writepages,
 };
 
+struct address_space_operations ext2_aops_xip = {
+        .bmap                   = ext2_bmap,
+        .get_xip_page           = ext2_get_xip_page,
+};
+
 struct address_space_operations ext2_nobh_aops = {
         .readpage               = ext2_readpage,
         .readpages              = ext2_readpages,
@@ -910,7 +926,9 @@ void ext2_truncate (struct inode * inode)
         iblock = (inode->i_size + blocksize-1)
                                         >> EXT2_BLOCK_SIZE_BITS(inode->i_sb);
 
-        if (test_opt(inode->i_sb, NOBH))
+        if (mapping_is_xip(inode->i_mapping))
+                xip_truncate_page(inode->i_mapping, inode->i_size);
+        else if (test_opt(inode->i_sb, NOBH))
                 nobh_truncate_page(inode->i_mapping, inode->i_size);
         else
                 block_truncate_page(inode->i_mapping,
@@ -1110,11 +1128,16 @@ void ext2_read_inode (struct inode * inode)
 
         if (S_ISREG(inode->i_mode)) {
                 inode->i_op = &ext2_file_inode_operations;
-                inode->i_fop = &ext2_file_operations;
-                if (test_opt(inode->i_sb, NOBH))
+                if (ext2_use_xip(inode->i_sb)) {
+                        inode->i_mapping->a_ops = &ext2_aops_xip;
+                        inode->i_fop = &ext2_xip_file_operations;
+                } else if (test_opt(inode->i_sb, NOBH)) {
                         inode->i_mapping->a_ops = &ext2_nobh_aops;
-                else
+                        inode->i_fop = &ext2_file_operations;
+                } else {
                         inode->i_mapping->a_ops = &ext2_aops;
+                        inode->i_fop = &ext2_file_operations;
+                }
         } else if (S_ISDIR(inode->i_mode)) {
                 inode->i_op = &ext2_dir_inode_operations;
                 inode->i_fop = &ext2_dir_operations;