1 files changed, 92 insertions, 5 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index f1b56ff01208..00c98fab6333 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -80,6 +80,36 @@ static void ext4_destroy_lazyinit_thread(void);
 static void ext4_unregister_li_request(struct super_block *sb);
 static void ext4_clear_request_list(void);
 
+/*
+ * Lock ordering
+ *
+ * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
+ * i_mmap_rwsem (inode->i_mmap_rwsem)!
+ *
+ * page fault path:
+ * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
+ *   page lock -> i_data_sem (rw)
+ *
+ * buffered write path:
+ * sb_start_write -> i_mutex -> mmap_sem
+ * sb_start_write -> i_mutex -> transaction start -> page lock ->
+ *   i_data_sem (rw)
+ *
+ * truncate:
+ * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
+ *   i_mmap_rwsem (w) -> page lock
+ * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
+ *   transaction start -> i_data_sem (rw)
+ *
+ * direct IO:
+ * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
+ * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
+ *   transaction start -> i_data_sem (rw)
+ *
+ * writepages:
+ * transaction start -> page lock(s) -> i_data_sem (rw)
+ */
+
 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
 static struct file_system_type ext2_fs_type = {
         .owner          = THIS_MODULE,
@@ -958,6 +988,7 @@ static void init_once(void *foo)
         INIT_LIST_HEAD(&ei->i_orphan);
         init_rwsem(&ei->xattr_sem);
         init_rwsem(&ei->i_data_sem);
+        init_rwsem(&ei->i_mmap_sem);
         inode_init_once(&ei->vfs_inode);
 }
 
@@ -1066,8 +1097,8 @@ static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
 }
 
 #ifdef CONFIG_QUOTA
-#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
-#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
+static char *quotatypes[] = INITQFNAMES;
+#define QTYPE2NAME(t) (quotatypes[t])
 
 static int ext4_write_dquot(struct dquot *dquot);
 static int ext4_acquire_dquot(struct dquot *dquot);
@@ -1100,6 +1131,7 @@ static const struct dquot_operations ext4_quota_operations = {
         .write_info     = ext4_write_info,
         .alloc_dquot    = dquot_alloc,
         .destroy_dquot  = dquot_destroy,
+        .get_projid     = ext4_get_projid,
 };
 
 static const struct quotactl_ops ext4_qctl_operations = {
@@ -2526,6 +2558,12 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
                          "without CONFIG_QUOTA");
                 return 0;
         }
+        if (ext4_has_feature_project(sb) && !readonly) {
+                ext4_msg(sb, KERN_ERR,
+                         "Filesystem with project quota feature cannot be mounted RDWR "
+                         "without CONFIG_QUOTA");
+                return 0;
+        }
 #endif  /* CONFIG_QUOTA */
         return 1;
 }
@@ -3654,7 +3692,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
                 sb->s_qcop = &dquot_quotactl_sysfile_ops;
         else
                 sb->s_qcop = &ext4_qctl_operations;
-        sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
+        sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
 #endif
         memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
 
@@ -4790,6 +4828,48 @@ restore_opts:
         return err;
 }
 
+#ifdef CONFIG_QUOTA
+static int ext4_statfs_project(struct super_block *sb,
+                               kprojid_t projid, struct kstatfs *buf)
+{
+        struct kqid qid;
+        struct dquot *dquot;
+        u64 limit;
+        u64 curblock;
+
+        qid = make_kqid_projid(projid);
+        dquot = dqget(sb, qid);
+        if (IS_ERR(dquot))
+                return PTR_ERR(dquot);
+        spin_lock(&dq_data_lock);
+
+        limit = (dquot->dq_dqb.dqb_bsoftlimit ?
+                 dquot->dq_dqb.dqb_bsoftlimit :
+                 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
+        if (limit && buf->f_blocks > limit) {
+                curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
+                buf->f_blocks = limit;
+                buf->f_bfree = buf->f_bavail =
+                        (buf->f_blocks > curblock) ?
+                         (buf->f_blocks - curblock) : 0;
+        }
+
+        limit = dquot->dq_dqb.dqb_isoftlimit ?
+                dquot->dq_dqb.dqb_isoftlimit :
+                dquot->dq_dqb.dqb_ihardlimit;
+        if (limit && buf->f_files > limit) {
+                buf->f_files = limit;
+                buf->f_ffree =
+                        (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
+                         (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
+        }
+
+        spin_unlock(&dq_data_lock);
+        dqput(dquot);
+        return 0;
+}
+#endif
+
 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
         struct super_block *sb = dentry->d_sb;
@@ -4822,6 +4902,11 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
 
+#ifdef CONFIG_QUOTA
+        if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
+            sb_has_quota_limits_enabled(sb, PRJQUOTA))
+                ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
+#endif
         return 0;
 }
 
@@ -4986,7 +5071,8 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
         struct inode *qf_inode;
         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
-                le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
+                le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
+                le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
         };
 
         BUG_ON(!ext4_has_feature_quota(sb));
@@ -5014,7 +5100,8 @@ static int ext4_enable_quotas(struct super_block *sb)
         int type, err = 0;
         unsigned long qf_inums[EXT4_MAXQUOTAS] = {
                 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
-                le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
+                le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
+                le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
         };
 
         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;