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Message-Id: <20191023052752.693689-3-Valdis.Kletnieks@vt.edu>
Date: Wed, 23 Oct 2019 01:27:45 -0400
From: Valdis Kletnieks <valdis.kletnieks@...edu>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Valdis.Kletnieks@...edu
Cc: Valdis Kletnieks <valdis.kletnieks@...edu>,
linux-fsdevel@...r.kernel.org, devel@...verdev.osuosl.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/8] staging: exfat: Remove FAT/VFAT mount support, part 1
Remove the top-level mount functionality, to make this driver handle
only exfat file systems.
Signed-off-by: Valdis Kletnieks <Valdis.Kletnieks@...edu>
---
drivers/staging/exfat/Kconfig | 9 --
drivers/staging/exfat/exfat.h | 2 -
drivers/staging/exfat/exfat_core.c | 142 ----------------------------
drivers/staging/exfat/exfat_super.c | 8 +-
4 files changed, 1 insertion(+), 160 deletions(-)
diff --git a/drivers/staging/exfat/Kconfig b/drivers/staging/exfat/Kconfig
index ce32dfe33bec..0130019cbec2 100644
--- a/drivers/staging/exfat/Kconfig
+++ b/drivers/staging/exfat/Kconfig
@@ -6,15 +6,6 @@ config EXFAT_FS
help
This adds support for the exFAT file system.
-config EXFAT_DONT_MOUNT_VFAT
- bool "Prohibit mounting of fat/vfat filesystems by exFAT"
- depends on EXFAT_FS
- default y
- help
- By default, the exFAT driver will only mount exFAT filesystems, and refuse
- to mount fat/vfat filesystems. Set this to 'n' to allow the exFAT driver
- to mount these filesystems.
-
config EXFAT_DISCARD
bool "enable discard support"
depends on EXFAT_FS
diff --git a/drivers/staging/exfat/exfat.h b/drivers/staging/exfat/exfat.h
index 0c779c8dd858..c2db3e9e9785 100644
--- a/drivers/staging/exfat/exfat.h
+++ b/drivers/staging/exfat/exfat.h
@@ -935,8 +935,6 @@ s32 resolve_path(struct inode *inode, char *path, struct chain_t *p_dir,
static s32 resolve_name(u8 *name, u8 **arg);
/* file operation functions */
-static s32 fat16_mount(struct super_block *sb, struct pbr_sector_t *p_pbr);
-static s32 fat32_mount(struct super_block *sb, struct pbr_sector_t *p_pbr);
s32 exfat_mount(struct super_block *sb, struct pbr_sector_t *p_pbr);
s32 create_dir(struct inode *inode, struct chain_t *p_dir,
struct uni_name_t *p_uniname, struct file_id_t *fid);
diff --git a/drivers/staging/exfat/exfat_core.c b/drivers/staging/exfat/exfat_core.c
index 0260e4fe3762..fd481b21f8b6 100644
--- a/drivers/staging/exfat/exfat_core.c
+++ b/drivers/staging/exfat/exfat_core.c
@@ -2980,148 +2980,6 @@ s32 resolve_path(struct inode *inode, char *path, struct chain_t *p_dir,
/*
* File Operation Functions
*/
-static struct fs_func fat_fs_func = {
- .alloc_cluster = fat_alloc_cluster,
- .free_cluster = fat_free_cluster,
- .count_used_clusters = fat_count_used_clusters,
-
- .init_dir_entry = fat_init_dir_entry,
- .init_ext_entry = fat_init_ext_entry,
- .find_dir_entry = fat_find_dir_entry,
- .delete_dir_entry = fat_delete_dir_entry,
- .get_uni_name_from_ext_entry = fat_get_uni_name_from_ext_entry,
- .count_ext_entries = fat_count_ext_entries,
- .calc_num_entries = fat_calc_num_entries,
-
- .get_entry_type = fat_get_entry_type,
- .set_entry_type = fat_set_entry_type,
- .get_entry_attr = fat_get_entry_attr,
- .set_entry_attr = fat_set_entry_attr,
- .get_entry_flag = fat_get_entry_flag,
- .set_entry_flag = fat_set_entry_flag,
- .get_entry_clu0 = fat_get_entry_clu0,
- .set_entry_clu0 = fat_set_entry_clu0,
- .get_entry_size = fat_get_entry_size,
- .set_entry_size = fat_set_entry_size,
- .get_entry_time = fat_get_entry_time,
- .set_entry_time = fat_set_entry_time,
-};
-
-static s32 fat16_mount(struct super_block *sb, struct pbr_sector_t *p_pbr)
-{
- s32 num_reserved, num_root_sectors;
- struct bpb16_t *p_bpb = (struct bpb16_t *)p_pbr->bpb;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
- struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
-
- if (p_bpb->num_fats == 0)
- return FFS_FORMATERR;
-
- num_root_sectors = GET16(p_bpb->num_root_entries) << DENTRY_SIZE_BITS;
- num_root_sectors = ((num_root_sectors - 1) >>
- p_bd->sector_size_bits) + 1;
-
- p_fs->sectors_per_clu = p_bpb->sectors_per_clu;
- p_fs->sectors_per_clu_bits = ilog2(p_bpb->sectors_per_clu);
- p_fs->cluster_size_bits = p_fs->sectors_per_clu_bits +
- p_bd->sector_size_bits;
- p_fs->cluster_size = 1 << p_fs->cluster_size_bits;
-
- p_fs->num_FAT_sectors = GET16(p_bpb->num_fat_sectors);
-
- p_fs->FAT1_start_sector = p_fs->PBR_sector + GET16(p_bpb->num_reserved);
- if (p_bpb->num_fats == 1)
- p_fs->FAT2_start_sector = p_fs->FAT1_start_sector;
- else
- p_fs->FAT2_start_sector = p_fs->FAT1_start_sector +
- p_fs->num_FAT_sectors;
-
- p_fs->root_start_sector = p_fs->FAT2_start_sector +
- p_fs->num_FAT_sectors;
- p_fs->data_start_sector = p_fs->root_start_sector + num_root_sectors;
-
- p_fs->num_sectors = GET16(p_bpb->num_sectors);
- if (p_fs->num_sectors == 0)
- p_fs->num_sectors = GET32(p_bpb->num_huge_sectors);
-
- num_reserved = p_fs->data_start_sector - p_fs->PBR_sector;
- p_fs->num_clusters = ((p_fs->num_sectors - num_reserved) >>
- p_fs->sectors_per_clu_bits) + 2;
- /* because the cluster index starts with 2 */
-
- if (p_fs->num_clusters < FAT12_THRESHOLD)
- p_fs->vol_type = FAT12;
- else
- p_fs->vol_type = FAT16;
- p_fs->vol_id = GET32(p_bpb->vol_serial);
-
- p_fs->root_dir = 0;
- p_fs->dentries_in_root = GET16(p_bpb->num_root_entries);
- p_fs->dentries_per_clu = 1 << (p_fs->cluster_size_bits -
- DENTRY_SIZE_BITS);
-
- p_fs->vol_flag = VOL_CLEAN;
- p_fs->clu_srch_ptr = 2;
- p_fs->used_clusters = UINT_MAX;
-
- p_fs->fs_func = &fat_fs_func;
-
- return FFS_SUCCESS;
-}
-
-static s32 fat32_mount(struct super_block *sb, struct pbr_sector_t *p_pbr)
-{
- s32 num_reserved;
- struct bpb32_t *p_bpb = (struct bpb32_t *)p_pbr->bpb;
- struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info);
- struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info);
-
- if (p_bpb->num_fats == 0)
- return FFS_FORMATERR;
-
- p_fs->sectors_per_clu = p_bpb->sectors_per_clu;
- p_fs->sectors_per_clu_bits = ilog2(p_bpb->sectors_per_clu);
- p_fs->cluster_size_bits = p_fs->sectors_per_clu_bits +
- p_bd->sector_size_bits;
- p_fs->cluster_size = 1 << p_fs->cluster_size_bits;
-
- p_fs->num_FAT_sectors = GET32(p_bpb->num_fat32_sectors);
-
- p_fs->FAT1_start_sector = p_fs->PBR_sector + GET16(p_bpb->num_reserved);
- if (p_bpb->num_fats == 1)
- p_fs->FAT2_start_sector = p_fs->FAT1_start_sector;
- else
- p_fs->FAT2_start_sector = p_fs->FAT1_start_sector +
- p_fs->num_FAT_sectors;
-
- p_fs->root_start_sector = p_fs->FAT2_start_sector +
- p_fs->num_FAT_sectors;
- p_fs->data_start_sector = p_fs->root_start_sector;
-
- p_fs->num_sectors = GET32(p_bpb->num_huge_sectors);
- num_reserved = p_fs->data_start_sector - p_fs->PBR_sector;
-
- p_fs->num_clusters = ((p_fs->num_sectors - num_reserved) >>
- p_fs->sectors_per_clu_bits) + 2;
- /* because the cluster index starts with 2 */
-
- p_fs->vol_type = FAT32;
- p_fs->vol_id = GET32(p_bpb->vol_serial);
-
- p_fs->root_dir = GET32(p_bpb->root_cluster);
- p_fs->dentries_in_root = 0;
- p_fs->dentries_per_clu = 1 << (p_fs->cluster_size_bits -
- DENTRY_SIZE_BITS);
-
- p_fs->vol_flag = VOL_CLEAN;
- p_fs->clu_srch_ptr = 2;
- p_fs->used_clusters = UINT_MAX;
-
- p_fs->fs_func = &fat_fs_func;
-
- return FFS_SUCCESS;
-}
-
static struct fs_func exfat_fs_func = {
.alloc_cluster = exfat_alloc_cluster,
.free_cluster = exfat_free_cluster,
diff --git a/drivers/staging/exfat/exfat_super.c b/drivers/staging/exfat/exfat_super.c
index 86ace780a60b..0264be92c2be 100644
--- a/drivers/staging/exfat/exfat_super.c
+++ b/drivers/staging/exfat/exfat_super.c
@@ -394,16 +394,10 @@ static int ffsMountVol(struct super_block *sb)
break;
if (i < 53) {
-#ifdef CONFIG_EXFAT_DONT_MOUNT_VFAT
+ /* Not sure how we'd get here, but complain if it does */
ret = -EINVAL;
printk(KERN_INFO "EXFAT: Attempted to mount VFAT filesystem\n");
goto out;
-#else
- if (GET16(p_pbr->bpb + 11)) /* num_fat_sectors */
- ret = fat16_mount(sb, p_pbr);
- else
- ret = fat32_mount(sb, p_pbr);
-#endif
} else {
ret = exfat_mount(sb, p_pbr);
}
--
2.23.0
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