Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 regression fixes from Ted Ts'o:
 "This fixes a scalability problem reported by Andi Kleen and Tim Chen;
  they were quite secretive about the precise nature of their workload,
  but they later admitted that it only showed up when they were using a
  large sparse file, so the amount of data I/O that was needed was close
  to zero.

  I'm not sure how realistic this is and it's only a regression if you
  consider changes made since 2.6.39 to be a "regression" vis-a-vis the
  policy regarding post-merge window bug fixes, but Linus agreed it was
  worth fixing, so I'm including it in this pull request.

  This also fixes the journalled quota mount options, which I
  accidentally broke while I was cleaning up the mount option handling."

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix handling of journalled quota options
  ext4: address scalability issue by removing extent cache statistics

3 files changed, 15 insertions, 40 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index ab2594a30f8..0e01e90add8 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1203,9 +1203,6 @@ struct ext4_sb_info {
         unsigned long s_ext_blocks;
         unsigned long s_ext_extents;
 #endif
-        /* ext4 extent cache stats */
-        unsigned long extent_cache_hits;
-        unsigned long extent_cache_misses;
 
         /* for buddy allocator */
         struct ext4_group_info ***s_group_info;
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 1d418387ffb..abcdeab67f5 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2066,10 +2066,6 @@ static int ext4_ext_check_cache(struct inode *inode, ext4_lblk_t block,
                 ret = 1;
         }
 errout:
-        if (!ret)
-                sbi->extent_cache_misses++;
-        else
-                sbi->extent_cache_hits++;
         trace_ext4_ext_in_cache(inode, block, ret);
         spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
         return ret;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ceebaf853be..6da193564e4 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1305,20 +1305,20 @@ static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
                 ext4_msg(sb, KERN_ERR,
                         "Cannot change journaled "
                         "quota options when quota turned on");
-                return 0;
+                return -1;
         }
         qname = match_strdup(args);
         if (!qname) {
                 ext4_msg(sb, KERN_ERR,
                         "Not enough memory for storing quotafile name");
-                return 0;
+                return -1;
         }
         if (sbi->s_qf_names[qtype] &&
                 strcmp(sbi->s_qf_names[qtype], qname)) {
                 ext4_msg(sb, KERN_ERR,
                         "%s quota file already specified", QTYPE2NAME(qtype));
                 kfree(qname);
-                return 0;
+                return -1;
         }
         sbi->s_qf_names[qtype] = qname;
         if (strchr(sbi->s_qf_names[qtype], '/')) {
@@ -1326,7 +1326,7 @@ static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
                         "quotafile must be on filesystem root");
                 kfree(sbi->s_qf_names[qtype]);
                 sbi->s_qf_names[qtype] = NULL;
-                return 0;
+                return -1;
         }
         set_opt(sb, QUOTA);
         return 1;
@@ -1341,7 +1341,7 @@ static int clear_qf_name(struct super_block *sb, int qtype)
                 sbi->s_qf_names[qtype]) {
                 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
                         " when quota turned on");
-                return 0;
+                return -1;
         }
         /*
          * The space will be released later when all options are confirmed
@@ -1450,6 +1450,16 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
         const struct mount_opts *m;
         int arg = 0;
 
+#ifdef CONFIG_QUOTA
+        if (token == Opt_usrjquota)
+                return set_qf_name(sb, USRQUOTA, &args[0]);
+        else if (token == Opt_grpjquota)
+                return set_qf_name(sb, GRPQUOTA, &args[0]);
+        else if (token == Opt_offusrjquota)
+                return clear_qf_name(sb, USRQUOTA);
+        else if (token == Opt_offgrpjquota)
+                return clear_qf_name(sb, GRPQUOTA);
+#endif
         if (args->from && match_int(args, &arg))
                 return -1;
         switch (token) {
@@ -1549,18 +1559,6 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
                                 sbi->s_mount_opt |= m->mount_opt;
                         }
 #ifdef CONFIG_QUOTA
-                } else if (token == Opt_usrjquota) {
-                        if (!set_qf_name(sb, USRQUOTA, &args[0]))
-                                return -1;
-                } else if (token == Opt_grpjquota) {
-                        if (!set_qf_name(sb, GRPQUOTA, &args[0]))
-                                return -1;
-                } else if (token == Opt_offusrjquota) {
-                        if (!clear_qf_name(sb, USRQUOTA))
-                                return -1;
-                } else if (token == Opt_offgrpjquota) {
-                        if (!clear_qf_name(sb, GRPQUOTA))
-                                return -1;
                 } else if (m->flags & MOPT_QFMT) {
                         if (sb_any_quota_loaded(sb) &&
                             sbi->s_jquota_fmt != m->mount_opt) {
@@ -2366,18 +2364,6 @@ static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
                           EXT4_SB(sb)->s_sectors_written_start) >> 1)));
 }
 
-static ssize_t extent_cache_hits_show(struct ext4_attr *a,
-                                      struct ext4_sb_info *sbi, char *buf)
-{
-        return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
-}
-
-static ssize_t extent_cache_misses_show(struct ext4_attr *a,
-                                        struct ext4_sb_info *sbi, char *buf)
-{
-        return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
-}
-
 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
                                           struct ext4_sb_info *sbi,
                                           const char *buf, size_t count)
@@ -2435,8 +2421,6 @@ static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
 EXT4_RO_ATTR(delayed_allocation_blocks);
 EXT4_RO_ATTR(session_write_kbytes);
 EXT4_RO_ATTR(lifetime_write_kbytes);
-EXT4_RO_ATTR(extent_cache_hits);
-EXT4_RO_ATTR(extent_cache_misses);
 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
                  inode_readahead_blks_store, s_inode_readahead_blks);
 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
@@ -2452,8 +2436,6 @@ static struct attribute *ext4_attrs[] = {
         ATTR_LIST(delayed_allocation_blocks),
         ATTR_LIST(session_write_kbytes),
         ATTR_LIST(lifetime_write_kbytes),
-        ATTR_LIST(extent_cache_hits),
-        ATTR_LIST(extent_cache_misses),
         ATTR_LIST(inode_readahead_blks),
         ATTR_LIST(inode_goal),
         ATTR_LIST(mb_stats),