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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-26 16:00:37 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-12-26 16:00:37 -0300
commit35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (patch)
tree281fc9db2a40c54ee94dc88fc2bf8c119cfafc15 /fs/exfat/exfat_blkdev.c
parentf3a16ba6a1152b8966dcadc668af4cf00623c7b1 (diff)
Add support for the exFAT file system, fix hangs on older intel hardware and update AUFSpck-4.3.3-gnu
Diffstat (limited to 'fs/exfat/exfat_blkdev.c')
-rw-r--r--fs/exfat/exfat_blkdev.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/fs/exfat/exfat_blkdev.c b/fs/exfat/exfat_blkdev.c
new file mode 100644
index 000000000..02fa4fe18
--- /dev/null
+++ b/fs/exfat/exfat_blkdev.c
@@ -0,0 +1,197 @@
+/*
+ * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/************************************************************************/
+/* */
+/* PROJECT : exFAT & FAT12/16/32 File System */
+/* FILE : exfat_blkdev.c */
+/* PURPOSE : exFAT Block Device Driver Glue Layer */
+/* */
+/*----------------------------------------------------------------------*/
+/* NOTES */
+/* */
+/*----------------------------------------------------------------------*/
+/* REVISION HISTORY (Ver 0.9) */
+/* */
+/* - 2010.11.15 [Joosun Hahn] : first writing */
+/* */
+/************************************************************************/
+
+#include <linux/blkdev.h>
+#include <linux/log2.h>
+#include "exfat_config.h"
+#include "exfat_blkdev.h"
+#include "exfat_data.h"
+#include "exfat_api.h"
+#include "exfat_super.h"
+
+/*----------------------------------------------------------------------*/
+/* Constant & Macro Definitions */
+/*----------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------*/
+/* Global Variable Definitions */
+/*----------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------*/
+/* Local Variable Definitions */
+/*----------------------------------------------------------------------*/
+
+/*======================================================================*/
+/* Function Definitions */
+/*======================================================================*/
+
+s32 bdev_init(void)
+{
+ return FFS_SUCCESS;
+}
+
+s32 bdev_shutdown(void)
+{
+ return FFS_SUCCESS;
+}
+
+s32 bdev_open(struct super_block *sb)
+{
+ BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+ if (p_bd->opened)
+ return FFS_SUCCESS;
+
+ p_bd->sector_size = bdev_logical_block_size(sb->s_bdev);
+ p_bd->sector_size_bits = ilog2(p_bd->sector_size);
+ p_bd->sector_size_mask = p_bd->sector_size - 1;
+ p_bd->num_sectors = i_size_read(sb->s_bdev->bd_inode) >> p_bd->sector_size_bits;
+
+ p_bd->opened = TRUE;
+
+ return FFS_SUCCESS;
+}
+
+s32 bdev_close(struct super_block *sb)
+{
+ BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
+
+ if (!p_bd->opened)
+ return FFS_SUCCESS;
+
+ p_bd->opened = FALSE;
+ return FFS_SUCCESS;
+}
+
+s32 bdev_read(struct super_block *sb, u32 secno, struct buffer_head **bh, u32 num_secs, s32 read)
+{
+ BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
+ FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ long flags = sbi->debug_flags;
+
+ if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
+ return FFS_MEDIAERR;
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+ if (!p_bd->opened)
+ return FFS_MEDIAERR;
+
+ if (*bh)
+ __brelse(*bh);
+
+ if (read)
+ *bh = __bread(sb->s_bdev, secno, num_secs << p_bd->sector_size_bits);
+ else
+ *bh = __getblk(sb->s_bdev, secno, num_secs << p_bd->sector_size_bits);
+
+ if (*bh)
+ return FFS_SUCCESS;
+
+ WARN(!p_fs->dev_ejected,
+ "[EXFAT] No bh, device seems wrong or to be ejected.\n");
+
+ return FFS_MEDIAERR;
+}
+
+s32 bdev_write(struct super_block *sb, u32 secno, struct buffer_head *bh, u32 num_secs, s32 sync)
+{
+ s32 count;
+ struct buffer_head *bh2;
+ BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
+ FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info);
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ long flags = sbi->debug_flags;
+
+ if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
+ return FFS_MEDIAERR;
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+ if (!p_bd->opened)
+ return FFS_MEDIAERR;
+
+ if (secno == bh->b_blocknr) {
+ lock_buffer(bh);
+ set_buffer_uptodate(bh);
+ mark_buffer_dirty(bh);
+ unlock_buffer(bh);
+ if (sync && (sync_dirty_buffer(bh) != 0))
+ return FFS_MEDIAERR;
+ } else {
+ count = num_secs << p_bd->sector_size_bits;
+
+ bh2 = __getblk(sb->s_bdev, secno, count);
+
+ if (bh2 == NULL)
+ goto no_bh;
+
+ lock_buffer(bh2);
+ memcpy(bh2->b_data, bh->b_data, count);
+ set_buffer_uptodate(bh2);
+ mark_buffer_dirty(bh2);
+ unlock_buffer(bh2);
+ if (sync && (sync_dirty_buffer(bh2) != 0)) {
+ __brelse(bh2);
+ goto no_bh;
+ }
+ __brelse(bh2);
+ }
+
+ return FFS_SUCCESS;
+
+no_bh:
+ WARN(!p_fs->dev_ejected,
+ "[EXFAT] No bh, device seems wrong or to be ejected.\n");
+
+ return FFS_MEDIAERR;
+}
+
+s32 bdev_sync(struct super_block *sb)
+{
+ BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info);
+#ifdef CONFIG_EXFAT_KERNEL_DEBUG
+ struct exfat_sb_info *sbi = EXFAT_SB(sb);
+ long flags = sbi->debug_flags;
+
+ if (flags & EXFAT_DEBUGFLAGS_ERROR_RW)
+ return FFS_MEDIAERR;
+#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
+
+ if (!p_bd->opened)
+ return FFS_MEDIAERR;
+
+ return sync_blockdev(sb->s_bdev);
+}