Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/k…

…ernel/git/mfasheh/ocfs2

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2:
  ocfs2: Remove overzealous BUG_ON()
  ocfs2: Don't print on unknown remote blocking call
  ocfs2: Remove EXPERIMENTAL dependency
  ocfs2: implement directory read-ahead
  ocfs2: properly update i_mtime on buffered write
  ocfs2: Fix directory link count checks in ocfs2_link()
  ocfs2: move nlink check in ocfs2_mknod()
  ocfs2: Fix heartbeat sector calculation
  [PATCH] fs/ocfs2/ioctl.c should #include "ioctl.h"
  ocfs2: add ext2 attributes
  configfs: Prevent duplicate subsystem names.

fs/Kconfig

@@ -325,8 +325,8 @@ config FS_POSIX_ACL
 source "fs/xfs/Kconfig"
 
 config OCFS2_FS
-	tristate "OCFS2 file system support (EXPERIMENTAL)"
-	depends on NET && SYSFS && EXPERIMENTAL
+	tristate "OCFS2 file system support"
+	depends on NET && SYSFS
 	select CONFIGFS_FS
 	select JBD
 	select CRC32

fs/configfs/dir.c

@@ -86,6 +86,32 @@ static struct configfs_dirent *configfs_new_dirent(struct configfs_dirent * pare
 	return sd;
 }
 
+/*
+ *
+ * Return -EEXIST if there is already a configfs element with the same
+ * name for the same parent.
+ *
+ * called with parent inode's i_mutex held
+ */
+int configfs_dirent_exists(struct configfs_dirent *parent_sd,
+			   const unsigned char *new)
+{
+	struct configfs_dirent * sd;
+
+	list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
+		if (sd->s_element) {
+			const unsigned char *existing = configfs_get_name(sd);
+			if (strcmp(existing, new))
+				continue;
+			else
+				return -EEXIST;
+		}
+	}
+
+	return 0;
+}
+
+
 int configfs_make_dirent(struct configfs_dirent * parent_sd,
 			 struct dentry * dentry, void * element,
 			 umode_t mode, int type)
@@ -136,8 +162,10 @@ static int create_dir(struct config_item * k, struct dentry * p,
 	int error;
 	umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
 
-	error = configfs_make_dirent(p->d_fsdata, d, k, mode,
-				     CONFIGFS_DIR);
+	error = configfs_dirent_exists(p->d_fsdata, d->d_name.name);
+	if (!error)
+		error = configfs_make_dirent(p->d_fsdata, d, k, mode,
+					     CONFIGFS_DIR);
 	if (!error) {
 		error = configfs_create(d, mode, init_dir);
 		if (!error) {

fs/ocfs2/Makefile

@@ -16,6 +16,7 @@ ocfs2-objs := \
 	file.o 			\
 	heartbeat.o 		\
 	inode.o 		\
+	ioctl.o 		\
 	journal.o 		\
 	localalloc.o 		\
 	mmap.o 			\

fs/ocfs2/alloc.c

@@ -1717,17 +1717,29 @@ static int ocfs2_do_truncate(struct ocfs2_super *osb,
 
 			ocfs2_remove_from_cache(inode, eb_bh);
 
-			BUG_ON(eb->h_suballoc_slot);
 			BUG_ON(el->l_recs[0].e_clusters);
 			BUG_ON(el->l_recs[0].e_cpos);
 			BUG_ON(el->l_recs[0].e_blkno);
-			status = ocfs2_free_extent_block(handle,
-							 tc->tc_ext_alloc_inode,
-							 tc->tc_ext_alloc_bh,
-							 eb);
-			if (status < 0) {
-				mlog_errno(status);
-				goto bail;
+			if (eb->h_suballoc_slot == 0) {
+				/*
+				 * This code only understands how to
+				 * lock the suballocator in slot 0,
+				 * which is fine because allocation is
+				 * only ever done out of that
+				 * suballocator too. A future version
+				 * might change that however, so avoid
+				 * a free if we don't know how to
+				 * handle it. This way an fs incompat
+				 * bit will not be necessary.
+				 */
+				status = ocfs2_free_extent_block(handle,
+								 tc->tc_ext_alloc_inode,
+								 tc->tc_ext_alloc_bh,
+								 eb);
+				if (status < 0) {
+					mlog_errno(status);
+					goto bail;
+				}
 			}
 		}
 		brelse(eb_bh);

fs/ocfs2/aops.c

@@ -391,31 +391,28 @@ struct ocfs2_journal_handle *ocfs2_start_walk_page_trans(struct inode *inode,
 static int ocfs2_commit_write(struct file *file, struct page *page,
 			      unsigned from, unsigned to)
 {
-	int ret, extending = 0, locklevel = 0;
-	loff_t new_i_size;
+	int ret;
 	struct buffer_head *di_bh = NULL;
 	struct inode *inode = page->mapping->host;
 	struct ocfs2_journal_handle *handle = NULL;
+	struct ocfs2_dinode *di;
 
 	mlog_entry("(0x%p, 0x%p, %u, %u)\n", file, page, from, to);
 
 	/* NOTE: ocfs2_file_aio_write has ensured that it's safe for
-	 * us to sample inode->i_size here without the metadata lock:
+	 * us to continue here without rechecking the I/O against
+	 * changed inode values.
 	 *
 	 * 1) We're currently holding the inode alloc lock, so no
 	 *    nodes can change it underneath us.
 	 *
 	 * 2) We've had to take the metadata lock at least once
-	 *    already to check for extending writes, hence insuring
-	 *    that our current copy is also up to date.
+	 *    already to check for extending writes, suid removal, etc.
+	 *    The meta data update code then ensures that we don't get a
+	 *    stale inode allocation image (i_size, i_clusters, etc).
 	 */
-	new_i_size = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
-	if (new_i_size > i_size_read(inode)) {
-		extending = 1;
-		locklevel = 1;
-	}
 
-	ret = ocfs2_meta_lock_with_page(inode, NULL, &di_bh, locklevel, page);
+	ret = ocfs2_meta_lock_with_page(inode, NULL, &di_bh, 1, page);
 	if (ret != 0) {
 		mlog_errno(ret);
 		goto out;
@@ -427,23 +424,20 @@ static int ocfs2_commit_write(struct file *file, struct page *page,
 		goto out_unlock_meta;
 	}
 
-	if (extending) {
-		handle = ocfs2_start_walk_page_trans(inode, page, from, to);
-		if (IS_ERR(handle)) {
-			ret = PTR_ERR(handle);
-			handle = NULL;
-			goto out_unlock_data;
-		}
+	handle = ocfs2_start_walk_page_trans(inode, page, from, to);
+	if (IS_ERR(handle)) {
+		ret = PTR_ERR(handle);
+		goto out_unlock_data;
+	}
 
-		/* Mark our buffer early. We'd rather catch this error up here
-		 * as opposed to after a successful commit_write which would
-		 * require us to set back inode->i_size. */
-		ret = ocfs2_journal_access(handle, inode, di_bh,
-					   OCFS2_JOURNAL_ACCESS_WRITE);
-		if (ret < 0) {
-			mlog_errno(ret);
-			goto out_commit;
-		}
+	/* Mark our buffer early. We'd rather catch this error up here
+	 * as opposed to after a successful commit_write which would
+	 * require us to set back inode->i_size. */
+	ret = ocfs2_journal_access(handle, inode, di_bh,
+				   OCFS2_JOURNAL_ACCESS_WRITE);
+	if (ret < 0) {
+		mlog_errno(ret);
+		goto out_commit;
 	}
 
 	/* might update i_size */
@@ -453,37 +447,28 @@ static int ocfs2_commit_write(struct file *file, struct page *page,
 		goto out_commit;
 	}
 
-	if (extending) {
-		loff_t size = (u64) i_size_read(inode);
-		struct ocfs2_dinode *di =
-			(struct ocfs2_dinode *)di_bh->b_data;
+	di = (struct ocfs2_dinode *)di_bh->b_data;
 
-		/* ocfs2_mark_inode_dirty is too heavy to use here. */
-		inode->i_blocks = ocfs2_align_bytes_to_sectors(size);
-		inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+	/* ocfs2_mark_inode_dirty() is too heavy to use here. */
+	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	di->i_mtime = di->i_ctime = cpu_to_le64(inode->i_mtime.tv_sec);
+	di->i_mtime_nsec = di->i_ctime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
 
-		di->i_size = cpu_to_le64(size);
-		di->i_ctime = di->i_mtime = 
-				cpu_to_le64(inode->i_mtime.tv_sec);
-		di->i_ctime_nsec = di->i_mtime_nsec = 
-				cpu_to_le32(inode->i_mtime.tv_nsec);
+	inode->i_blocks = ocfs2_align_bytes_to_sectors((u64)(i_size_read(inode)));
+	di->i_size = cpu_to_le64((u64)i_size_read(inode));
 
-		ret = ocfs2_journal_dirty(handle, di_bh);
-		if (ret < 0) {
-			mlog_errno(ret);
-			goto out_commit;
-		}
+	ret = ocfs2_journal_dirty(handle, di_bh);
+	if (ret < 0) {
+		mlog_errno(ret);
+		goto out_commit;
 	}
 
-	BUG_ON(extending && (i_size_read(inode) != new_i_size));
-
 out_commit:
-	if (handle)
-		ocfs2_commit_trans(handle);
+	ocfs2_commit_trans(handle);
 out_unlock_data:
 	ocfs2_data_unlock(inode, 1);
 out_unlock_meta:
-	ocfs2_meta_unlock(inode, locklevel);
+	ocfs2_meta_unlock(inode, 1);
 out:
 	if (di_bh)
 		brelse(di_bh);

fs/ocfs2/buffer_head_io.c

@@ -100,6 +100,9 @@ int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
 	mlog_entry("(block=(%llu), nr=(%d), flags=%d, inode=%p)\n",
 		   (unsigned long long)block, nr, flags, inode);
 
+	BUG_ON((flags & OCFS2_BH_READAHEAD) &&
+	       (!inode || !(flags & OCFS2_BH_CACHED)));
+
 	if (osb == NULL || osb->sb == NULL || bhs == NULL) {
 		status = -EINVAL;
 		mlog_errno(status);
@@ -140,6 +143,30 @@ int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
 		bh = bhs[i];
 		ignore_cache = 0;
 
+		/* There are three read-ahead cases here which we need to
+		 * be concerned with. All three assume a buffer has
+		 * previously been submitted with OCFS2_BH_READAHEAD
+		 * and it hasn't yet completed I/O.
+		 *
+		 * 1) The current request is sync to disk. This rarely
+		 *    happens these days, and never when performance
+		 *    matters - the code can just wait on the buffer
+		 *    lock and re-submit.
+		 *
+		 * 2) The current request is cached, but not
+		 *    readahead. ocfs2_buffer_uptodate() will return
+		 *    false anyway, so we'll wind up waiting on the
+		 *    buffer lock to do I/O. We re-check the request
+		 *    with after getting the lock to avoid a re-submit.
+		 *
+		 * 3) The current request is readahead (and so must
+		 *    also be a caching one). We short circuit if the
+		 *    buffer is locked (under I/O) and if it's in the
+		 *    uptodate cache. The re-check from #2 catches the
+		 *    case that the previous read-ahead completes just
+		 *    before our is-it-in-flight check.
+		 */
+
 		if (flags & OCFS2_BH_CACHED &&
 		    !ocfs2_buffer_uptodate(inode, bh)) {
 			mlog(ML_UPTODATE,
@@ -169,6 +196,14 @@ int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
 				continue;
 			}
 
+			/* A read-ahead request was made - if the
+			 * buffer is already under read-ahead from a
+			 * previously submitted request than we are
+			 * done here. */
+			if ((flags & OCFS2_BH_READAHEAD)
+			    && ocfs2_buffer_read_ahead(inode, bh))
+				continue;
+
 			lock_buffer(bh);
 			if (buffer_jbd(bh)) {
 #ifdef CATCH_BH_JBD_RACES
@@ -181,13 +216,22 @@ int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
 				continue;
 #endif
 			}
+
+			/* Re-check ocfs2_buffer_uptodate() as a
+			 * previously read-ahead buffer may have
+			 * completed I/O while we were waiting for the
+			 * buffer lock. */
+			if ((flags & OCFS2_BH_CACHED)
+			    && !(flags & OCFS2_BH_READAHEAD)
+			    && ocfs2_buffer_uptodate(inode, bh)) {
+				unlock_buffer(bh);
+				continue;
+			}
+
 			clear_buffer_uptodate(bh);
 			get_bh(bh); /* for end_buffer_read_sync() */
 			bh->b_end_io = end_buffer_read_sync;
-			if (flags & OCFS2_BH_READAHEAD)
-				submit_bh(READA, bh);
-			else
-				submit_bh(READ, bh);
+			submit_bh(READ, bh);
 			continue;
 		}
 	}
@@ -197,34 +241,39 @@ int ocfs2_read_blocks(struct ocfs2_super *osb, u64 block, int nr,
 	for (i = (nr - 1); i >= 0; i--) {
 		bh = bhs[i];
 
-		/* We know this can't have changed as we hold the
-		 * inode sem. Avoid doing any work on the bh if the
-		 * journal has it. */
-		if (!buffer_jbd(bh))
-			wait_on_buffer(bh);
-
-		if (!buffer_uptodate(bh)) {
-			/* Status won't be cleared from here on out,
-			 * so we can safely record this and loop back
-			 * to cleanup the other buffers. Don't need to
-			 * remove the clustered uptodate information
-			 * for this bh as it's not marked locally
-			 * uptodate. */
-			status = -EIO;
-			brelse(bh);
-			bhs[i] = NULL;
-			continue;
+		if (!(flags & OCFS2_BH_READAHEAD)) {
+			/* We know this can't have changed as we hold the
+			 * inode sem. Avoid doing any work on the bh if the
+			 * journal has it. */
+			if (!buffer_jbd(bh))
+				wait_on_buffer(bh);
+
+			if (!buffer_uptodate(bh)) {
+				/* Status won't be cleared from here on out,
+				 * so we can safely record this and loop back
+				 * to cleanup the other buffers. Don't need to
+				 * remove the clustered uptodate information
+				 * for this bh as it's not marked locally
+				 * uptodate. */
+				status = -EIO;
+				brelse(bh);
+				bhs[i] = NULL;
+				continue;
+			}
 		}
 
+		/* Always set the buffer in the cache, even if it was
+		 * a forced read, or read-ahead which hasn't yet
+		 * completed. */
 		if (inode)
 			ocfs2_set_buffer_uptodate(inode, bh);
 	}
 	if (inode)
 		mutex_unlock(&OCFS2_I(inode)->ip_io_mutex);
 
-	mlog(ML_BH_IO, "block=(%llu), nr=(%d), cached=%s\n", 
+	mlog(ML_BH_IO, "block=(%llu), nr=(%d), cached=%s, flags=0x%x\n", 
 	     (unsigned long long)block, nr,
-	     (!(flags & OCFS2_BH_CACHED) || ignore_cache) ? "no" : "yes");
+	     (!(flags & OCFS2_BH_CACHED) || ignore_cache) ? "no" : "yes", flags);
 
 bail:
 

fs/ocfs2/buffer_head_io.h

@@ -49,7 +49,7 @@ int ocfs2_read_blocks(struct ocfs2_super          *osb,
 
 
 #define OCFS2_BH_CACHED            1
-#define OCFS2_BH_READAHEAD         8	/* use this to pass READA down to submit_bh */
+#define OCFS2_BH_READAHEAD         8
 
 static inline int ocfs2_read_block(struct ocfs2_super * osb, u64 off,
 				   struct buffer_head **bh, int flags,

fs/ocfs2/cluster/heartbeat.c

@@ -320,8 +320,12 @@ static int compute_max_sectors(struct block_device *bdev)
 		max_pages = q->max_hw_segments;
 	max_pages--; /* Handle I/Os that straddle a page */
 
-	max_sectors = max_pages << (PAGE_SHIFT - 9);
-
+	if (max_pages) {
+		max_sectors = max_pages << (PAGE_SHIFT - 9);
+	} else {
+		/* If BIO contains 1 or less than 1 page. */
+		max_sectors = q->max_sectors;
+	}
 	/* Why is fls() 1-based???? */
 	pow_two_sectors = 1 << (fls(max_sectors) - 1);