Merge Linus' tree.

6 files changed, 164 insertions, 44 deletions

diff --git a/fs/fat/cache.c b/fs/fat/cache.c
index 77c24fcf712..1acc941245f 100644
--- a/fs/fat/cache.c
+++ b/fs/fat/cache.c
@@ -295,7 +295,8 @@ static int fat_bmap_cluster(struct inode *inode, int cluster)
 	return dclus;
 }
 
-int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys)
+int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
+	     unsigned long *mapped_blocks)
 {
 	struct super_block *sb = inode->i_sb;
 	struct msdos_sb_info *sbi = MSDOS_SB(sb);
@@ -303,9 +304,12 @@ int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys)
 	int cluster, offset;
 
 	*phys = 0;
+	*mapped_blocks = 0;
 	if ((sbi->fat_bits != 32) && (inode->i_ino == MSDOS_ROOT_INO)) {
-		if (sector < (sbi->dir_entries >> sbi->dir_per_block_bits))
+		if (sector < (sbi->dir_entries >> sbi->dir_per_block_bits)) {
 			*phys = sector + sbi->dir_start;
+			*mapped_blocks = 1;
+		}
 		return 0;
 	}
 	last_block = (MSDOS_I(inode)->mmu_private + (sb->s_blocksize - 1))
@@ -318,7 +322,11 @@ int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys)
 	cluster = fat_bmap_cluster(inode, cluster);
 	if (cluster < 0)
 		return cluster;
-	else if (cluster)
+	else if (cluster) {
 		*phys = fat_clus_to_blknr(sbi, cluster) + offset;
+		*mapped_blocks = sbi->sec_per_clus - offset;
+		if (*mapped_blocks > last_block - sector)
+			*mapped_blocks = last_block - sector;
+	}
 	return 0;
 }
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index ba824964b9b..eef1b81aa29 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -45,8 +45,8 @@ static inline void fat_dir_readahead(struct inode *dir, sector_t iblock,
 	if ((sbi->fat_bits != 32) && (dir->i_ino == MSDOS_ROOT_INO))
 		return;
 
-	bh = sb_getblk(sb, phys);
-	if (bh && !buffer_uptodate(bh)) {
+	bh = sb_find_get_block(sb, phys);
+	if (bh == NULL || !buffer_uptodate(bh)) {
 		for (sec = 0; sec < sbi->sec_per_clus; sec++)
 			sb_breadahead(sb, phys + sec);
 	}
@@ -68,8 +68,8 @@ static int fat__get_entry(struct inode *dir, loff_t *pos,
 {
 	struct super_block *sb = dir->i_sb;
 	sector_t phys, iblock;
-	int offset;
-	int err;
+	unsigned long mapped_blocks;
+	int err, offset;
 
 next:
 	if (*bh)
@@ -77,7 +77,7 @@ next:
 
 	*bh = NULL;
 	iblock = *pos >> sb->s_blocksize_bits;
-	err = fat_bmap(dir, iblock, &phys);
+	err = fat_bmap(dir, iblock, &phys, &mapped_blocks);
 	if (err || !phys)
 		return -1;	/* beyond EOF or error */
 
@@ -418,7 +418,7 @@ EODir:
 	return err;
 }
 
-EXPORT_SYMBOL(fat_search_long);
+EXPORT_SYMBOL_GPL(fat_search_long);
 
 struct fat_ioctl_filldir_callback {
 	struct dirent __user *dirent;
@@ -780,7 +780,7 @@ int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
 	return -ENOENT;
 }
 
-EXPORT_SYMBOL(fat_get_dotdot_entry);
+EXPORT_SYMBOL_GPL(fat_get_dotdot_entry);
 
 /* See if directory is empty */
 int fat_dir_empty(struct inode *dir)
@@ -803,7 +803,7 @@ int fat_dir_empty(struct inode *dir)
 	return result;
 }
 
-EXPORT_SYMBOL(fat_dir_empty);
+EXPORT_SYMBOL_GPL(fat_dir_empty);
 
 /*
  * fat_subdirs counts the number of sub-directories of dir. It can be run
@@ -849,7 +849,7 @@ int fat_scan(struct inode *dir, const unsigned char *name,
 	return -ENOENT;
 }
 
-EXPORT_SYMBOL(fat_scan);
+EXPORT_SYMBOL_GPL(fat_scan);
 
 static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
 {
@@ -936,7 +936,7 @@ int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
 	return 0;
 }
 
-EXPORT_SYMBOL(fat_remove_entries);
+EXPORT_SYMBOL_GPL(fat_remove_entries);
 
 static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
 			      struct buffer_head **bhs, int nr_bhs)
@@ -1048,7 +1048,7 @@ error:
 	return err;
 }
 
-EXPORT_SYMBOL(fat_alloc_new_dir);
+EXPORT_SYMBOL_GPL(fat_alloc_new_dir);
 
 static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
 			       int *nr_cluster, struct msdos_dir_entry **de,
@@ -1264,4 +1264,4 @@ error_remove:
 	return err;
 }
 
-EXPORT_SYMBOL(fat_add_entries);
+EXPORT_SYMBOL_GPL(fat_add_entries);
diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index 4164cd54c4d..a1a9e045121 100644
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -476,6 +476,7 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
 				sbi->prev_free = entry;
 				if (sbi->free_clusters != -1)
 					sbi->free_clusters--;
+				sb->s_dirt = 1;
 
 				cluster[idx_clus] = entry;
 				idx_clus++;
@@ -496,6 +497,7 @@ int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster)
 
 	/* Couldn't allocate the free entries */
 	sbi->free_clusters = 0;
+	sb->s_dirt = 1;
 	err = -ENOSPC;
 
 out:
@@ -509,7 +511,6 @@ out:
 	}
 	for (i = 0; i < nr_bhs; i++)
 		brelse(bhs[i]);
-	fat_clusters_flush(sb);
 
 	if (err && idx_clus)
 		fat_free_clusters(inode, cluster[0]);
@@ -542,8 +543,10 @@ int fat_free_clusters(struct inode *inode, int cluster)
 		}
 
 		ops->ent_put(&fatent, FAT_ENT_FREE);
-		if (sbi->free_clusters != -1)
+		if (sbi->free_clusters != -1) {
 			sbi->free_clusters++;
+			sb->s_dirt = 1;
+		}
 
 		if (nr_bhs + fatent.nr_bhs > MAX_BUF_PER_PAGE) {
 			if (sb->s_flags & MS_SYNCHRONOUS) {
@@ -578,7 +581,7 @@ error:
 	return err;
 }
 
-EXPORT_SYMBOL(fat_free_clusters);
+EXPORT_SYMBOL_GPL(fat_free_clusters);
 
 int fat_count_free_clusters(struct super_block *sb)
 {
@@ -605,6 +608,7 @@ int fat_count_free_clusters(struct super_block *sb)
 		} while (fat_ent_next(sbi, &fatent));
 	}
 	sbi->free_clusters = free;
+	sb->s_dirt = 1;
 	fatent_brelse(&fatent);
 out:
 	unlock_fat(sbi);
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 7134403d5be..9b07c328a6f 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -11,6 +11,7 @@
 #include <linux/msdos_fs.h>
 #include <linux/smp_lock.h>
 #include <linux/buffer_head.h>
+#include <linux/writeback.h>
 
 int fat_generic_ioctl(struct inode *inode, struct file *filp,
 		      unsigned int cmd, unsigned long arg)
@@ -124,6 +125,24 @@ struct file_operations fat_file_operations = {
 	.sendfile	= generic_file_sendfile,
 };
 
+static int fat_cont_expand(struct inode *inode, loff_t size)
+{
+	struct address_space *mapping = inode->i_mapping;
+	loff_t start = inode->i_size, count = size - inode->i_size;
+	int err;
+
+	err = generic_cont_expand_simple(inode, size);
+	if (err)
+		goto out;
+
+	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
+	mark_inode_dirty(inode);
+	if (IS_SYNC(inode))
+		err = sync_page_range_nolock(inode, mapping, start, count);
+out:
+	return err;
+}
+
 int fat_notify_change(struct dentry *dentry, struct iattr *attr)
 {
 	struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
@@ -132,11 +151,17 @@ int fat_notify_change(struct dentry *dentry, struct iattr *attr)
 
 	lock_kernel();
 
-	/* FAT cannot truncate to a longer file */
+	/*
+	 * Expand the file. Since inode_setattr() updates ->i_size
+	 * before calling the ->truncate(), but FAT needs to fill the
+	 * hole before it.
+	 */
 	if (attr->ia_valid & ATTR_SIZE) {
 		if (attr->ia_size > inode->i_size) {
-			error = -EPERM;
-			goto out;
+			error = fat_cont_expand(inode, attr->ia_size);
+			if (error || attr->ia_valid == ATTR_SIZE)
+				goto out;
+			attr->ia_valid &= ~ATTR_SIZE;
 		}
 	}
 
@@ -173,7 +198,7 @@ out:
 	return error;
 }
 
-EXPORT_SYMBOL(fat_notify_change);
+EXPORT_SYMBOL_GPL(fat_notify_change);
 
 /* Free all clusters after the skip'th cluster. */
 static int fat_free(struct inode *inode, int skip)
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index a0f9b9fe130..e7f4aa7fc68 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -18,10 +18,12 @@
 #include <linux/seq_file.h>
 #include <linux/msdos_fs.h>
 #include <linux/pagemap.h>
+#include <linux/mpage.h>
 #include <linux/buffer_head.h>
 #include <linux/mount.h>
 #include <linux/vfs.h>
 #include <linux/parser.h>
+#include <linux/uio.h>
 #include <asm/unaligned.h>
 
 #ifndef CONFIG_FAT_DEFAULT_IOCHARSET
@@ -48,51 +50,97 @@ static int fat_add_cluster(struct inode *inode)
 	return err;
 }
 
-static int fat_get_block(struct inode *inode, sector_t iblock,
-			 struct buffer_head *bh_result, int create)
+static int __fat_get_blocks(struct inode *inode, sector_t iblock,
+			    unsigned long *max_blocks,
+			    struct buffer_head *bh_result, int create)
 {
 	struct super_block *sb = inode->i_sb;
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
 	sector_t phys;
-	int err;
+	unsigned long mapped_blocks;
+	int err, offset;
 
-	err = fat_bmap(inode, iblock, &phys);
+	err = fat_bmap(inode, iblock, &phys, &mapped_blocks);
 	if (err)
 		return err;
 	if (phys) {
 		map_bh(bh_result, sb, phys);
+		*max_blocks = min(mapped_blocks, *max_blocks);
 		return 0;
 	}
 	if (!create)
 		return 0;
+
 	if (iblock != MSDOS_I(inode)->mmu_private >> sb->s_blocksize_bits) {
 		fat_fs_panic(sb, "corrupted file size (i_pos %lld, %lld)",
 			     MSDOS_I(inode)->i_pos, MSDOS_I(inode)->mmu_private);
 		return -EIO;
 	}
-	if (!((unsigned long)iblock & (MSDOS_SB(sb)->sec_per_clus - 1))) {
+
+	offset = (unsigned long)iblock & (sbi->sec_per_clus - 1);
+	if (!offset) {
+		/* TODO: multiple cluster allocation would be desirable. */
 		err = fat_add_cluster(inode);
 		if (err)
 			return err;
 	}
-	MSDOS_I(inode)->mmu_private += sb->s_blocksize;
-	err = fat_bmap(inode, iblock, &phys);
+	/* available blocks on this cluster */
+	mapped_blocks = sbi->sec_per_clus - offset;
+
+	*max_blocks = min(mapped_blocks, *max_blocks);
+	MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits;
+
+	err = fat_bmap(inode, iblock, &phys, &mapped_blocks);
 	if (err)
 		return err;
-	if (!phys)
-		BUG();
+	BUG_ON(!phys);
+	BUG_ON(*max_blocks != mapped_blocks);
 	set_buffer_new(bh_result);
 	map_bh(bh_result, sb, phys);
 	return 0;
 }
 
+static int fat_get_blocks(struct inode *inode, sector_t iblock,
+			  unsigned long max_blocks,
+			  struct buffer_head *bh_result, int create)
+{
+	struct super_block *sb = inode->i_sb;
+	int err;
+
+	err = __fat_get_blocks(inode, iblock, &max_blocks, bh_result, create);
+	if (err)
+		return err;
+	bh_result->b_size = max_blocks << sb->s_blocksize_bits;
+	return 0;
+}
+
+static int fat_get_block(struct inode *inode, sector_t iblock,
+			 struct buffer_head *bh_result, int create)
+{
+	unsigned long max_blocks = 1;
+	return __fat_get_blocks(inode, iblock, &max_blocks, bh_result, create);
+}
+
 static int fat_writepage(struct page *page, struct writeback_control *wbc)
 {
 	return block_write_full_page(page, fat_get_block, wbc);
 }
 
+static int fat_writepages(struct address_space *mapping,
+			  struct writeback_control *wbc)
+{
+	return mpage_writepages(mapping, wbc, fat_get_block);
+}
+
 static int fat_readpage(struct file *file, struct page *page)
 {
-	return block_read_full_page(page, fat_get_block);
+	return mpage_readpage(page, fat_get_block);
+}
+
+static int fat_readpages(struct file *file, struct address_space *mapping,
+			 struct list_head *pages, unsigned nr_pages)
+{
+	return mpage_readpages(mapping, pages, nr_pages, fat_get_block);
 }
 
 static int fat_prepare_write(struct file *file, struct page *page,
@@ -115,6 +163,34 @@ static int fat_commit_write(struct file *file, struct page *page,
 	return err;
 }
 
+static ssize_t fat_direct_IO(int rw, struct kiocb *iocb,
+			     const struct iovec *iov,
+			     loff_t offset, unsigned long nr_segs)
+{
+	struct file *file = iocb->ki_filp;
+	struct inode *inode = file->f_mapping->host;
+
+	if (rw == WRITE) {
+		/*
+		 * FIXME: blockdev_direct_IO() doesn't use ->prepare_write(),
+		 * so we need to update the ->mmu_private to block boundary.
+		 *
+		 * But we must fill the remaining area or hole by nul for
+		 * updating ->mmu_private.
+		 */
+		loff_t size = offset + iov_length(iov, nr_segs);
+		if (MSDOS_I(inode)->mmu_private < size)
+			return -EINVAL;
+	}
+
+	/*
+	 * FAT need to use the DIO_LOCKING for avoiding the race
+	 * condition of fat_get_block() and ->truncate().
+	 */
+	return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
+				  offset, nr_segs, fat_get_blocks, NULL);
+}
+
 static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
 {
 	return generic_block_bmap(mapping, block, fat_get_block);
@@ -122,10 +198,13 @@ static sector_t _fat_bmap(struct address_space *mapping, sector_t block)
 
 static struct address_space_operations fat_aops = {
 	.readpage	= fat_readpage,
+	.readpages	= fat_readpages,
 	.writepage	= fat_writepage,
+	.writepages	= fat_writepages,
 	.sync_page	= block_sync_page,
 	.prepare_write	= fat_prepare_write,
 	.commit_write	= fat_commit_write,
+	.direct_IO	= fat_direct_IO,
 	.bmap		= _fat_bmap
 };
 
@@ -182,7 +261,7 @@ void fat_attach(struct inode *inode, loff_t i_pos)
 	spin_unlock(&sbi->inode_hash_lock);
 }
 
-EXPORT_SYMBOL(fat_attach);
+EXPORT_SYMBOL_GPL(fat_attach);
 
 void fat_detach(struct inode *inode)
 {
@@ -193,7 +272,7 @@ void fat_detach(struct inode *inode)
 	spin_unlock(&sbi->inode_hash_lock);
 }
 
-EXPORT_SYMBOL(fat_detach);
+EXPORT_SYMBOL_GPL(fat_detach);
 
 struct inode *fat_iget(struct super_block *sb, loff_t i_pos)
 {
@@ -347,7 +426,7 @@ out:
 	return inode;
 }
 
-EXPORT_SYMBOL(fat_build_inode);
+EXPORT_SYMBOL_GPL(fat_build_inode);
 
 static void fat_delete_inode(struct inode *inode)
 {
@@ -374,12 +453,17 @@ static void fat_clear_inode(struct inode *inode)
 	unlock_kernel();
 }
 
-static void fat_put_super(struct super_block *sb)
+static void fat_write_super(struct super_block *sb)
 {
-	struct msdos_sb_info *sbi = MSDOS_SB(sb);
+	sb->s_dirt = 0;
 
 	if (!(sb->s_flags & MS_RDONLY))
 		fat_clusters_flush(sb);
+}
+
+static void fat_put_super(struct super_block *sb)
+{
+	struct msdos_sb_info *sbi = MSDOS_SB(sb);
 
 	if (sbi->nls_disk) {
 		unload_nls(sbi->nls_disk);
@@ -537,7 +621,7 @@ int fat_sync_inode(struct inode *inode)
 	return fat_write_inode(inode, 1);
 }
 
-EXPORT_SYMBOL(fat_sync_inode);
+EXPORT_SYMBOL_GPL(fat_sync_inode);
 
 static int fat_show_options(struct seq_file *m, struct vfsmount *mnt);
 static struct super_operations fat_sops = {
@@ -546,6 +630,7 @@ static struct super_operations fat_sops = {
 	.write_inode	= fat_write_inode,
 	.delete_inode	= fat_delete_inode,
 	.put_super	= fat_put_super,
+	.write_super	= fat_write_super,
 	.statfs		= fat_statfs,
 	.clear_inode	= fat_clear_inode,
 	.remount_fs	= fat_remount,
@@ -1347,7 +1432,7 @@ out_fail:
 	return error;
 }
 
-EXPORT_SYMBOL(fat_fill_super);
+EXPORT_SYMBOL_GPL(fat_fill_super);
 
 int __init fat_cache_init(void);
 void fat_cache_destroy(void);
diff --git a/fs/fat/misc.c b/fs/fat/misc.c
index 2a0df2122f5..32fb0a3f1da 100644
--- a/fs/fat/misc.c
+++ b/fs/fat/misc.c
@@ -33,7 +33,7 @@ void fat_fs_panic(struct super_block *s, const char *fmt, ...)
 	}
 }
 
-EXPORT_SYMBOL(fat_fs_panic);
+EXPORT_SYMBOL_GPL(fat_fs_panic);
 
 /* Flushes the number of free clusters on FAT32 */
 /* XXX: Need to write one per FSINFO block.  Currently only writes 1 */
@@ -67,8 +67,6 @@ void fat_clusters_flush(struct super_block *sb)
 		if (sbi->prev_free != -1)
 			fsinfo->next_cluster = cpu_to_le32(sbi->prev_free);
 		mark_buffer_dirty(bh);
-		if (sb->s_flags & MS_SYNCHRONOUS)
-			sync_dirty_buffer(bh);
 	}
 	brelse(bh);
 }
@@ -194,7 +192,7 @@ void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date)
 	*date = cpu_to_le16(nl_day-day_n[month-1]+1+(month << 5)+(year << 9));
 }
 
-EXPORT_SYMBOL(fat_date_unix2dos);
+EXPORT_SYMBOL_GPL(fat_date_unix2dos);
 
 int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
 {
@@ -222,4 +220,4 @@ int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs)
 	return err;
 }
 
-EXPORT_SYMBOL(fat_sync_bhs);
+EXPORT_SYMBOL_GPL(fat_sync_bhs);