--- /dev/null
+diff -ru linux-stage.orig/fs/ext4/ext4.h linux-stage/fs/ext4/ext4.h
+--- linux-stage.orig/fs/ext4/ext4.h 2012-12-31 15:58:19.000000000 -0500
++++ linux-stage/fs/ext4/ext4.h 2012-12-31 15:58:42.000000000 -0500
+@@ -894,7 +894,8 @@
+ /*
+ * Mount flags
+ */
+-#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
++#define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Disable mbcache */
++#define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
+ #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
+ #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
+ #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
+diff -ru linux-stage.orig/fs/ext4/super.c linux-stage/fs/ext4/super.c
+--- linux-stage.orig/fs/ext4/super.c 2012-12-31 15:58:19.000000000 -0500
++++ linux-stage/fs/ext4/super.c 2012-12-31 15:59:19.000000000 -0500
+@@ -1306,6 +1306,7 @@
+ Opt_dioread_nolock, Opt_dioread_lock,
+ Opt_mballoc, Opt_bigendian_extents, Opt_force_over_128tb,
+ Opt_extents, Opt_noextents,
++ Opt_no_mbcache,
+ Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
+ };
+
+@@ -1383,6 +1384,7 @@
+ {Opt_bigendian_extents, "bigendian_extents"},
+ {Opt_force_over_128tb, "force_over_128tb"},
+ {Opt_mballoc, "mballoc"},
++ {Opt_no_mbcache, "no_mbcache"},
+ {Opt_extents, "extents"},
+ {Opt_noextents, "noextents"},
+ {Opt_discard, "discard"},
+@@ -1919,6 +1921,9 @@
+ }
+ clear_opt(sb, EXTENTS);
+ break;
++ case Opt_no_mbcache:
++ set_opt(sb, NO_MBCACHE);
++ break;
+ default:
+ ext4_msg(sb, KERN_ERR,
+ "Unrecognized mount option \"%s\" "
+diff -ru linux-stage.orig/fs/ext4/xattr.c linux-stage/fs/ext4/xattr.c
+--- linux-stage.orig/fs/ext4/xattr.c 2012-12-31 15:58:19.000000000 -0500
++++ linux-stage/fs/ext4/xattr.c 2012-12-31 16:46:21.000000000 -0500
+@@ -86,7 +86,8 @@
+ # define ea_bdebug(f...)
+ #endif
+
+-static void ext4_xattr_cache_insert(struct buffer_head *);
++static void ext4_xattr_cache_insert(struct super_block *,
++ struct buffer_head *);
+ static struct buffer_head *ext4_xattr_cache_find(struct inode *,
+ struct ext4_xattr_header *,
+ struct mb_cache_entry **);
+@@ -332,7 +333,7 @@
+ error = -EIO;
+ goto cleanup;
+ }
+- ext4_xattr_cache_insert(bh);
++ ext4_xattr_cache_insert(inode->i_sb, bh);
+ entry = BFIRST(bh);
+ error = ext4_xattr_find_entry(&entry, name_index, name, bh->b_size, 1,
+ inode);
+@@ -492,7 +493,7 @@
+ error = -EIO;
+ goto cleanup;
+ }
+- ext4_xattr_cache_insert(bh);
++ ext4_xattr_cache_insert(inode->i_sb, bh);
+ error = ext4_xattr_list_entries(dentry, BFIRST(bh), buffer, buffer_size);
+
+ cleanup:
+@@ -589,7 +590,9 @@
+ struct mb_cache_entry *ce = NULL;
+ int error = 0;
+
+- ce = mb_cache_entry_get(ext4_xattr_cache, bh->b_bdev, bh->b_blocknr);
++ if (!test_opt(inode->i_sb, NO_MBCACHE))
++ ce = mb_cache_entry_get(ext4_xattr_cache, bh->b_bdev,
++ bh->b_blocknr);
+ error = ext4_journal_get_write_access(handle, bh);
+ if (error)
+ goto out;
+@@ -989,8 +992,10 @@
+ #define header(x) ((struct ext4_xattr_header *)(x))
+
+ if (s->base) {
+- ce = mb_cache_entry_get(ext4_xattr_cache, bs->bh->b_bdev,
+- bs->bh->b_blocknr);
++ if (!test_opt(inode->i_sb, NO_MBCACHE))
++ ce = mb_cache_entry_get(ext4_xattr_cache,
++ bs->bh->b_bdev,
++ bs->bh->b_blocknr);
+ error = ext4_journal_get_write_access(handle, bs->bh);
+ if (error)
+ goto cleanup;
+@@ -1007,7 +1012,7 @@
+ if (!IS_LAST_ENTRY(s->first))
+ ext4_xattr_rehash(header(s->base),
+ s->here);
+- ext4_xattr_cache_insert(bs->bh);
++ ext4_xattr_cache_insert(sb, bs->bh);
+ }
+ unlock_buffer(bs->bh);
+ if (error == -EIO)
+@@ -1090,7 +1095,8 @@
+ if (error)
+ goto cleanup_dquot;
+ }
+- mb_cache_entry_release(ce);
++ if (ce)
++ mb_cache_entry_release(ce);
+ ce = NULL;
+ } else if (bs->bh && s->base == bs->bh->b_data) {
+ /* We were modifying this block in-place. */
+@@ -1141,7 +1147,7 @@
+ memcpy(new_bh->b_data, s->base, new_bh->b_size);
+ set_buffer_uptodate(new_bh);
+ unlock_buffer(new_bh);
+- ext4_xattr_cache_insert(new_bh);
++ ext4_xattr_cache_insert(sb, new_bh);
+ error = ext4_handle_dirty_metadata(handle,
+ inode, new_bh);
+ if (error)
+@@ -1761,12 +1767,15 @@
+ * Returns 0, or a negative error number on failure.
+ */
+ static void
+-ext4_xattr_cache_insert(struct buffer_head *bh)
++ext4_xattr_cache_insert(struct super_block *sb, struct buffer_head *bh)
+ {
+ __u32 hash = le32_to_cpu(BHDR(bh)->h_hash);
+ struct mb_cache_entry *ce;
+ int error;
+
++ if (test_opt(sb, NO_MBCACHE))
++ return;
++
+ ce = mb_cache_entry_alloc(ext4_xattr_cache, GFP_NOFS);
+ if (!ce) {
+ ea_bdebug(bh, "out of memory");
+@@ -1839,6 +1848,8 @@
+ __u32 hash = le32_to_cpu(header->h_hash);
+ struct mb_cache_entry *ce;
+
++ if (test_opt(inode->i_sb, NO_MBCACHE))
++ return NULL;
+ if (!header->h_hash)
+ return NULL; /* never share */
+ ea_idebug(inode, "looking for cached blocks [%x]", (int)hash);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff