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Diffstat (limited to 'fs/sdfat/blkdev.c')
-rw-r--r--fs/sdfat/blkdev.c416
1 files changed, 416 insertions, 0 deletions
diff --git a/fs/sdfat/blkdev.c b/fs/sdfat/blkdev.c
new file mode 100644
index 000000000000..264c670df0f0
--- /dev/null
+++ b/fs/sdfat/blkdev.c
@@ -0,0 +1,416 @@
+/*
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+/************************************************************************/
+/* */
+/* PROJECT : exFAT & FAT12/16/32 File System */
+/* FILE : blkdev.c */
+/* PURPOSE : sdFAT Block Device Driver Glue Layer */
+/* */
+/*----------------------------------------------------------------------*/
+/* NOTES */
+/* */
+/************************************************************************/
+
+#include <linux/blkdev.h>
+#include <linux/log2.h>
+#include <linux/backing-dev.h>
+
+#include "sdfat.h"
+
+/*----------------------------------------------------------------------*/
+/* Constant & Macro Definitions */
+/*----------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------*/
+/* Global Variable Definitions */
+/*----------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------*/
+/* Local Variable Definitions */
+/*----------------------------------------------------------------------*/
+
+/*----------------------------------------------------------------------*/
+/* FUNCTIONS WHICH HAS KERNEL VERSION DEPENDENCY */
+/************************************************************************/
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
+ /* EMPTY */
+#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0) */
+static struct backing_dev_info *inode_to_bdi(struct inode *bd_inode)
+{
+ return bd_inode->i_mapping->backing_dev_info;
+}
+#endif
+
+/*======================================================================*/
+/* Function Definitions */
+/*======================================================================*/
+s32 bdev_open_dev(struct super_block *sb)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+
+ if (fsi->bd_opened)
+ return 0;
+
+ fsi->bd_opened = true;
+ return 0;
+}
+
+s32 bdev_close_dev(struct super_block *sb)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+
+ fsi->bd_opened = false;
+ return 0;
+}
+
+static inline s32 block_device_ejected(struct super_block *sb)
+{
+ struct inode *bd_inode = sb->s_bdev->bd_inode;
+ struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
+
+ return (bdi->dev == NULL);
+}
+
+s32 bdev_check_bdi_valid(struct super_block *sb)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+
+ if (block_device_ejected(sb)) {
+ if (!(fsi->prev_eio & SDFAT_EIO_BDI)) {
+ fsi->prev_eio |= SDFAT_EIO_BDI;
+ sdfat_log_msg(sb, KERN_ERR, "%s: block device is "
+ "eliminated.(bdi:%p)", __func__, sb->s_bdi);
+ sdfat_debug_warn_on(1);
+ }
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+
+/* Make a readahead request */
+s32 bdev_readahead(struct super_block *sb, u64 secno, u64 num_secs)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+ u32 sects_per_page = (PAGE_SIZE >> sb->s_blocksize_bits);
+ struct blk_plug plug;
+ u64 i;
+
+ if (!fsi->bd_opened)
+ return -EIO;
+
+ blk_start_plug(&plug);
+ for (i = 0; i < num_secs; i++) {
+ if (i && !(i & (sects_per_page - 1)))
+ blk_flush_plug(current);
+ sb_breadahead(sb, (sector_t)(secno + i));
+ }
+ blk_finish_plug(&plug);
+
+ return 0;
+}
+
+s32 bdev_mread(struct super_block *sb, u64 secno, struct buffer_head **bh, u64 num_secs, s32 read)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+ u8 blksize_bits = sb->s_blocksize_bits;
+#ifdef CONFIG_SDFAT_DBG_IOCTL
+ struct sdfat_sb_info *sbi = SDFAT_SB(sb);
+ long flags = sbi->debug_flags;
+
+ if (flags & SDFAT_DEBUGFLAGS_ERROR_RW)
+ return -EIO;
+#endif /* CONFIG_SDFAT_DBG_IOCTL */
+
+ if (!fsi->bd_opened)
+ return -EIO;
+
+ brelse(*bh);
+
+ if (read)
+ *bh = __bread(sb->s_bdev, (sector_t)secno, num_secs << blksize_bits);
+ else
+ *bh = __getblk(sb->s_bdev, (sector_t)secno, num_secs << blksize_bits);
+
+ /* read successfully */
+ if (*bh)
+ return 0;
+
+ /*
+ * patch 1.2.4 : reset ONCE warning message per volume.
+ */
+ if (!(fsi->prev_eio & SDFAT_EIO_READ)) {
+ fsi->prev_eio |= SDFAT_EIO_READ;
+ sdfat_log_msg(sb, KERN_ERR, "%s: No bh. I/O error.", __func__);
+ sdfat_debug_warn_on(1);
+ }
+
+ return -EIO;
+}
+
+s32 bdev_mwrite(struct super_block *sb, u64 secno, struct buffer_head *bh, u64 num_secs, s32 sync)
+{
+ u64 count;
+ struct buffer_head *bh2;
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+#ifdef CONFIG_SDFAT_DBG_IOCTL
+ struct sdfat_sb_info *sbi = SDFAT_SB(sb);
+ long flags = sbi->debug_flags;
+
+ if (flags & SDFAT_DEBUGFLAGS_ERROR_RW)
+ return -EIO;
+#endif /* CONFIG_SDFAT_DBG_IOCTL */
+
+ if (!fsi->bd_opened)
+ return -EIO;
+
+ if (secno == bh->b_blocknr) {
+ set_buffer_uptodate(bh);
+ mark_buffer_dirty(bh);
+ if (sync && (sync_dirty_buffer(bh) != 0))
+ return -EIO;
+ } else {
+ count = num_secs << sb->s_blocksize_bits;
+
+ bh2 = __getblk(sb->s_bdev, (sector_t)secno, count);
+
+ if (!bh2)
+ 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 0;
+no_bh:
+ /*
+ * patch 1.2.4 : reset ONCE warning message per volume.
+ */
+ if (!(fsi->prev_eio & SDFAT_EIO_WRITE)) {
+ fsi->prev_eio |= SDFAT_EIO_WRITE;
+ sdfat_log_msg(sb, KERN_ERR, "%s: No bh. I/O error.", __func__);
+ sdfat_debug_warn_on(1);
+ }
+
+ return -EIO;
+}
+
+s32 bdev_sync_all(struct super_block *sb)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+#ifdef CONFIG_SDFAT_DBG_IOCTL
+ struct sdfat_sb_info *sbi = SDFAT_SB(sb);
+ long flags = sbi->debug_flags;
+
+ if (flags & SDFAT_DEBUGFLAGS_ERROR_RW)
+ return -EIO;
+#endif /* CONFIG_SDFAT_DBG_IOCTL */
+
+ if (!fsi->bd_opened)
+ return -EIO;
+
+ return sync_blockdev(sb->s_bdev);
+}
+
+/*
+ * Sector Read/Write Functions
+ */
+s32 read_sect(struct super_block *sb, u64 sec, struct buffer_head **bh, s32 read)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+
+ BUG_ON(!bh);
+ if ((sec >= fsi->num_sectors) && (fsi->num_sectors > 0)) {
+ sdfat_fs_error_ratelimit(sb,
+ "%s: out of range (sect:%llu)", __func__, sec);
+ return -EIO;
+ }
+
+ if (bdev_mread(sb, sec, bh, 1, read)) {
+ sdfat_fs_error_ratelimit(sb,
+ "%s: I/O error (sect:%llu)", __func__, sec);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+s32 write_sect(struct super_block *sb, u64 sec, struct buffer_head *bh, s32 sync)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+
+ BUG_ON(!bh);
+ if ((sec >= fsi->num_sectors) && (fsi->num_sectors > 0)) {
+ sdfat_fs_error_ratelimit(sb,
+ "%s: out of range (sect:%llu)", __func__, sec);
+ return -EIO;
+ }
+
+ if (bdev_mwrite(sb, sec, bh, 1, sync)) {
+ sdfat_fs_error_ratelimit(sb, "%s: I/O error (sect:%llu)",
+ __func__, sec);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+s32 read_msect(struct super_block *sb, u64 sec, struct buffer_head **bh, u64 num_secs, s32 read)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+
+ BUG_ON(!bh);
+ if (((sec+num_secs) > fsi->num_sectors) && (fsi->num_sectors > 0)) {
+ sdfat_fs_error_ratelimit(sb, "%s: out of range(sect:%llu len:%llu)",
+ __func__, sec, num_secs);
+ return -EIO;
+ }
+
+ if (bdev_mread(sb, sec, bh, num_secs, read)) {
+ sdfat_fs_error_ratelimit(sb, "%s: I/O error (sect:%llu len:%llu)",
+ __func__, sec, num_secs);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+s32 write_msect(struct super_block *sb, u64 sec, struct buffer_head *bh, u64 num_secs, s32 sync)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+
+ BUG_ON(!bh);
+ if (((sec+num_secs) > fsi->num_sectors) && (fsi->num_sectors > 0)) {
+ sdfat_fs_error_ratelimit(sb, "%s: out of range(sect:%llu len:%llu)",
+ __func__, sec, num_secs);
+ return -EIO;
+ }
+
+
+ if (bdev_mwrite(sb, sec, bh, num_secs, sync)) {
+ sdfat_fs_error_ratelimit(sb, "%s: I/O error (sect:%llu len:%llu)",
+ __func__, sec, num_secs);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static inline void __blkdev_write_bhs(struct buffer_head **bhs, s32 nr_bhs)
+{
+ s32 i;
+
+ for (i = 0; i < nr_bhs; i++)
+ write_dirty_buffer(bhs[i], WRITE);
+}
+
+static inline s32 __blkdev_sync_bhs(struct buffer_head **bhs, s32 nr_bhs)
+{
+ s32 i, err = 0;
+
+ for (i = 0; i < nr_bhs; i++) {
+ wait_on_buffer(bhs[i]);
+ if (!err && !buffer_uptodate(bhs[i]))
+ err = -EIO;
+ }
+ return err;
+}
+
+static inline s32 __buffer_zeroed(struct super_block *sb, u64 blknr, u64 num_secs)
+{
+ struct buffer_head *bhs[MAX_BUF_PER_PAGE];
+ s32 nr_bhs = MAX_BUF_PER_PAGE;
+ u64 last_blknr = blknr + num_secs;
+ s32 err, i, n;
+ struct blk_plug plug;
+
+ /* Zeroing the unused blocks on this cluster */
+ n = 0;
+ blk_start_plug(&plug);
+ while (blknr < last_blknr) {
+ bhs[n] = sb_getblk(sb, (sector_t)blknr);
+ if (!bhs[n]) {
+ err = -ENOMEM;
+ blk_finish_plug(&plug);
+ goto error;
+ }
+ memset(bhs[n]->b_data, 0, sb->s_blocksize);
+ set_buffer_uptodate(bhs[n]);
+ mark_buffer_dirty(bhs[n]);
+
+ n++;
+ blknr++;
+
+ if (blknr == last_blknr)
+ break;
+
+ if (n == nr_bhs) {
+ __blkdev_write_bhs(bhs, n);
+
+ for (i = 0; i < n; i++)
+ brelse(bhs[i]);
+ n = 0;
+ }
+ }
+ __blkdev_write_bhs(bhs, n);
+ blk_finish_plug(&plug);
+
+ err = __blkdev_sync_bhs(bhs, n);
+ if (err)
+ goto error;
+
+ for (i = 0; i < n; i++)
+ brelse(bhs[i]);
+
+ return 0;
+
+error:
+ EMSG("%s: failed zeroed sect %llu\n", __func__, blknr);
+ for (i = 0; i < n; i++)
+ bforget(bhs[i]);
+
+ return err;
+}
+
+s32 write_msect_zero(struct super_block *sb, u64 sec, u64 num_secs)
+{
+ FS_INFO_T *fsi = &(SDFAT_SB(sb)->fsi);
+
+ if (((sec+num_secs) > fsi->num_sectors) && (fsi->num_sectors > 0)) {
+ sdfat_fs_error_ratelimit(sb, "%s: out of range(sect:%llu len:%llu)",
+ __func__, sec, num_secs);
+ return -EIO;
+ }
+
+ /* Just return -EAGAIN if it is failed */
+ if (__buffer_zeroed(sb, sec, num_secs))
+ return -EAGAIN;
+
+ return 0;
+} /* end of write_msect_zero */
+
+/* end of blkdev.c */
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