[PATCH] bitops: ntfs: remove generic_ffs()

Now the only user who are using generic_ffs() is ntfs filesystem.  This patch
isolates generic_ffs() as ntfs_ffs() for ntfs.

Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 32 insertions, 3 deletions

diff --git a/fs/ntfs/logfile.c b/fs/ntfs/logfile.c
index 0fd70295cca6..4af2ad1193ec 100644
--- a/fs/ntfs/logfile.c
+++ b/fs/ntfs/logfile.c
@@ -515,10 +515,10 @@ BOOL ntfs_check_logfile(struct inode *log_vi, RESTART_PAGE_HEADER **rp)
                 log_page_size = PAGE_CACHE_SIZE;
         log_page_mask = log_page_size - 1;
         /*
-         * Use generic_ffs() instead of ffs() to enable the compiler to
+         * Use ntfs_ffs() instead of ffs() to enable the compiler to
          * optimize log_page_size and log_page_bits into constants.
          */
-        log_page_bits = generic_ffs(log_page_size) - 1;
+        log_page_bits = ntfs_ffs(log_page_size) - 1;
         size &= ~(s64)(log_page_size - 1);
         /*
          * Ensure the log file is big enough to store at least the two restart
diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 4e72bc7afdf9..2438c00ec0ce 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -2670,7 +2670,7 @@ mft_rec_already_initialized:
                         ni->name_len = 4;
 
                         ni->itype.index.block_size = 4096;
-                        ni->itype.index.block_size_bits = generic_ffs(4096) - 1;
+                        ni->itype.index.block_size_bits = ntfs_ffs(4096) - 1;
                         ni->itype.index.collation_rule = COLLATION_FILE_NAME;
                         if (vol->cluster_size <= ni->itype.index.block_size) {
                                 ni->itype.index.vcn_size = vol->cluster_size;
diff --git a/fs/ntfs/ntfs.h b/fs/ntfs/ntfs.h
index 0624c8ef4d9c..166142960b53 100644
--- a/fs/ntfs/ntfs.h
+++ b/fs/ntfs/ntfs.h
@@ -132,4 +132,33 @@ extern int ntfs_ucstonls(const ntfs_volume *vol, const ntfschar *ins,
 /* From fs/ntfs/upcase.c */
 extern ntfschar *generate_default_upcase(void);
 
+static inline int ntfs_ffs(int x)
+{
+        int r = 1;
+
+        if (!x)
+                return 0;
+        if (!(x & 0xffff)) {
+                x >>= 16;
+                r += 16;
+        }
+        if (!(x & 0xff)) {
+                x >>= 8;
+                r += 8;
+        }
+        if (!(x & 0xf)) {
+                x >>= 4;
+                r += 4;
+        }
+        if (!(x & 3)) {
+                x >>= 2;
+                r += 2;
+        }
+        if (!(x & 1)) {
+                x >>= 1;
+                r += 1;
+        }
+        return r;
+}
+
 #endif /* _LINUX_NTFS_H */