diff options
Diffstat (limited to 'drivers/staging/exfat/exfat_super.c')
| -rw-r--r-- | drivers/staging/exfat/exfat_super.c | 3883 |
1 files changed, 0 insertions, 3883 deletions
diff --git a/drivers/staging/exfat/exfat_super.c b/drivers/staging/exfat/exfat_super.c deleted file mode 100644 index b81d2a87b82e..000000000000 --- a/drivers/staging/exfat/exfat_super.c +++ /dev/null @@ -1,3883 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. - */ - -#include <linux/module.h> -#include <linux/init.h> -#include <linux/time.h> -#include <linux/slab.h> -#include <linux/mm.h> -#include <linux/seq_file.h> -#include <linux/pagemap.h> -#include <linux/mpage.h> -#include <linux/buffer_head.h> -#include <linux/exportfs.h> -#include <linux/mount.h> -#include <linux/vfs.h> -#include <linux/aio.h> -#include <linux/iversion.h> -#include <linux/parser.h> -#include <linux/uio.h> -#include <linux/writeback.h> -#include <linux/log2.h> -#include <linux/hash.h> -#include <linux/backing-dev.h> -#include <linux/sched.h> -#include <linux/fs_struct.h> -#include <linux/namei.h> -#include <linux/random.h> -#include <linux/string.h> -#include <linux/nls.h> -#include <linux/mutex.h> -#include <linux/swap.h> - -#define EXFAT_VERSION "1.3.0" - -#include "exfat.h" - -static struct kmem_cache *exfat_inode_cachep; - -static int exfat_default_codepage = CONFIG_STAGING_EXFAT_DEFAULT_CODEPAGE; -static char exfat_default_iocharset[] = CONFIG_STAGING_EXFAT_DEFAULT_IOCHARSET; - -#define INC_IVERSION(x) (inode_inc_iversion(x)) -#define GET_IVERSION(x) (inode_peek_iversion_raw(x)) -#define SET_IVERSION(x, y) (inode_set_iversion(x, y)) - -static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos); -static int exfat_sync_inode(struct inode *inode); -static struct inode *exfat_build_inode(struct super_block *sb, - struct file_id_t *fid, loff_t i_pos); -static int exfat_write_inode(struct inode *inode, - struct writeback_control *wbc); -static void exfat_write_super(struct super_block *sb); - -#define UNIX_SECS_1980 315532800L -#define UNIX_SECS_2108 4354819200L - -/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */ -static void exfat_time_fat2unix(struct timespec64 *ts, struct date_time_t *tp) -{ - ts->tv_sec = mktime64(tp->Year + 1980, tp->Month + 1, tp->Day, - tp->Hour, tp->Minute, tp->Second); - - ts->tv_nsec = tp->MilliSecond * NSEC_PER_MSEC; -} - -/* Convert linear UNIX date to a FAT time/date pair. */ -static void exfat_time_unix2fat(struct timespec64 *ts, struct date_time_t *tp) -{ - time64_t second = ts->tv_sec; - struct tm tm; - - time64_to_tm(second, 0, &tm); - - if (second < UNIX_SECS_1980) { - tp->MilliSecond = 0; - tp->Second = 0; - tp->Minute = 0; - tp->Hour = 0; - tp->Day = 1; - tp->Month = 1; - tp->Year = 0; - return; - } - - if (second >= UNIX_SECS_2108) { - tp->MilliSecond = 999; - tp->Second = 59; - tp->Minute = 59; - tp->Hour = 23; - tp->Day = 31; - tp->Month = 12; - tp->Year = 127; - return; - } - - tp->MilliSecond = ts->tv_nsec / NSEC_PER_MSEC; - tp->Second = tm.tm_sec; - tp->Minute = tm.tm_min; - tp->Hour = tm.tm_hour; - tp->Day = tm.tm_mday; - tp->Month = tm.tm_mon + 1; - tp->Year = tm.tm_year + 1900 - 1980; -} - -struct timestamp_t *tm_current(struct timestamp_t *tp) -{ - time64_t second = ktime_get_real_seconds(); - struct tm tm; - - time64_to_tm(second, 0, &tm); - - if (second < UNIX_SECS_1980) { - tp->sec = 0; - tp->min = 0; - tp->hour = 0; - tp->day = 1; - tp->mon = 1; - tp->year = 0; - return tp; - } - - if (second >= UNIX_SECS_2108) { - tp->sec = 59; - tp->min = 59; - tp->hour = 23; - tp->day = 31; - tp->mon = 12; - tp->year = 127; - return tp; - } - - tp->sec = tm.tm_sec; - tp->min = tm.tm_min; - tp->hour = tm.tm_hour; - tp->day = tm.tm_mday; - tp->mon = tm.tm_mon + 1; - tp->year = tm.tm_year + 1900 - 1980; - - return tp; -} - -static void __lock_super(struct super_block *sb) -{ - struct exfat_sb_info *sbi = EXFAT_SB(sb); - - mutex_lock(&sbi->s_lock); -} - -static void __unlock_super(struct super_block *sb) -{ - struct exfat_sb_info *sbi = EXFAT_SB(sb); - - mutex_unlock(&sbi->s_lock); -} - -static int __is_sb_dirty(struct super_block *sb) -{ - struct exfat_sb_info *sbi = EXFAT_SB(sb); - - return sbi->s_dirt; -} - -static void __set_sb_clean(struct super_block *sb) -{ - struct exfat_sb_info *sbi = EXFAT_SB(sb); - - sbi->s_dirt = 0; -} - -static int __exfat_revalidate(struct dentry *dentry) -{ - return 0; -} - -static int exfat_revalidate(struct dentry *dentry, unsigned int flags) -{ - if (flags & LOOKUP_RCU) - return -ECHILD; - - if (dentry->d_inode) - return 1; - return __exfat_revalidate(dentry); -} - -static int exfat_revalidate_ci(struct dentry *dentry, unsigned int flags) -{ - if (flags & LOOKUP_RCU) - return -ECHILD; - - if (dentry->d_inode) - return 1; - - if (!flags) - return 0; - - if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) - return 0; - - return __exfat_revalidate(dentry); -} - -static unsigned int __exfat_striptail_len(unsigned int len, const char *name) -{ - while (len && name[len - 1] == '.') - len--; - return len; -} - -static unsigned int exfat_striptail_len(const struct qstr *qstr) -{ - return __exfat_striptail_len(qstr->len, qstr->name); -} - -static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr) -{ - qstr->hash = full_name_hash(dentry, qstr->name, - exfat_striptail_len(qstr)); - return 0; -} - -static int exfat_d_hashi(const struct dentry *dentry, struct qstr *qstr) -{ - struct super_block *sb = dentry->d_sb; - const unsigned char *name; - unsigned int len; - unsigned long hash; - - name = qstr->name; - len = exfat_striptail_len(qstr); - - hash = init_name_hash(dentry); - while (len--) - hash = partial_name_hash(nls_upper(sb, *name++), hash); - qstr->hash = end_name_hash(hash); - - return 0; -} - -static int exfat_cmpi(const struct dentry *dentry, unsigned int len, - const char *str, const struct qstr *name) -{ - struct nls_table *t = EXFAT_SB(dentry->d_sb)->nls_io; - unsigned int alen, blen; - - alen = exfat_striptail_len(name); - blen = __exfat_striptail_len(len, str); - if (alen == blen) { - if (!t) { - if (strncasecmp(name->name, str, alen) == 0) - return 0; - } else { - if (nls_strnicmp(t, name->name, str, alen) == 0) - return 0; - } - } - return 1; -} - -static int exfat_cmp(const struct dentry *dentry, unsigned int len, - const char *str, const struct qstr *name) -{ - unsigned int alen, blen; - - alen = exfat_striptail_len(name); - blen = __exfat_striptail_len(len, str); - if (alen == blen) { - if (strncmp(name->name, str, alen) == 0) - return 0; - } - return 1; -} - -static const struct dentry_operations exfat_ci_dentry_ops = { - .d_revalidate = exfat_revalidate_ci, - .d_hash = exfat_d_hashi, - .d_compare = exfat_cmpi, -}; - -static const struct dentry_operations exfat_dentry_ops = { - .d_revalidate = exfat_revalidate, - .d_hash = exfat_d_hash, - .d_compare = exfat_cmp, -}; - -static DEFINE_MUTEX(z_mutex); - -static inline void fs_sync(struct super_block *sb, bool do_sync) -{ - if (do_sync) - exfat_bdev_sync(sb); -} - -/* - * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to - * save ATTR_RO instead of ->i_mode. - * - * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only - * bit, it's just used as flag for app. - */ -static inline int exfat_mode_can_hold_ro(struct inode *inode) -{ - struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); - - if (S_ISDIR(inode->i_mode)) - return 0; - - if ((~sbi->options.fs_fmask) & 0222) - return 1; - return 0; -} - -/* Convert attribute bits and a mask to the UNIX mode. */ -static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi, u32 attr, - mode_t mode) -{ - if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR)) - mode &= ~0222; - - if (attr & ATTR_SUBDIR) - return (mode & ~sbi->options.fs_dmask) | S_IFDIR; - else if (attr & ATTR_SYMLINK) - return (mode & ~sbi->options.fs_dmask) | S_IFLNK; - else - return (mode & ~sbi->options.fs_fmask) | S_IFREG; -} - -/* Return the FAT attribute byte for this inode */ -static inline u32 exfat_make_attr(struct inode *inode) -{ - if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222)) - return (EXFAT_I(inode)->fid.attr) | ATTR_READONLY; - else - return EXFAT_I(inode)->fid.attr; -} - -static inline void exfat_save_attr(struct inode *inode, u32 attr) -{ - if (exfat_mode_can_hold_ro(inode)) - EXFAT_I(inode)->fid.attr = attr & ATTR_RWMASK; - else - EXFAT_I(inode)->fid.attr = attr & (ATTR_RWMASK | ATTR_READONLY); -} - -static int ffsMountVol(struct super_block *sb) -{ - int i, ret; - struct pbr_sector_t *p_pbr; - struct buffer_head *tmp_bh = NULL; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info); - - pr_info("[EXFAT] trying to mount...\n"); - - mutex_lock(&z_mutex); - - exfat_buf_init(sb); - - mutex_init(&p_fs->v_mutex); - p_fs->dev_ejected = 0; - - /* open the block device */ - exfat_bdev_open(sb); - - if (p_bd->sector_size < sb->s_blocksize) { - printk(KERN_INFO "EXFAT: mount failed - sector size %d less than blocksize %ld\n", - p_bd->sector_size, sb->s_blocksize); - ret = -EINVAL; - goto out; - } - if (p_bd->sector_size > sb->s_blocksize) - sb_set_blocksize(sb, p_bd->sector_size); - - /* read Sector 0 */ - if (sector_read(sb, 0, &tmp_bh, 1) != 0) { - ret = -EIO; - goto out; - } - - p_fs->PBR_sector = 0; - - p_pbr = (struct pbr_sector_t *)tmp_bh->b_data; - - /* check the validity of PBR */ - if (GET16_A(p_pbr->signature) != PBR_SIGNATURE) { - brelse(tmp_bh); - exfat_bdev_close(sb); - ret = -EFSCORRUPTED; - goto out; - } - - /* fill fs_struct */ - for (i = 0; i < 53; i++) - if (p_pbr->bpb[i]) - break; - - if (i < 53) { - /* Not sure how we'd get here, but complain if it does */ - ret = -EINVAL; - pr_info("EXFAT: Attempted to mount VFAT filesystem\n"); - goto out; - } else { - ret = exfat_mount(sb, p_pbr); - } - - brelse(tmp_bh); - - if (ret) { - exfat_bdev_close(sb); - goto out; - } - - ret = load_alloc_bitmap(sb); - if (ret) { - exfat_bdev_close(sb); - goto out; - } - ret = load_upcase_table(sb); - if (ret) { - free_alloc_bitmap(sb); - exfat_bdev_close(sb); - goto out; - } - - if (p_fs->dev_ejected) { - free_upcase_table(sb); - free_alloc_bitmap(sb); - exfat_bdev_close(sb); - ret = -EIO; - goto out; - } - - pr_info("[EXFAT] mounted successfully\n"); - -out: - mutex_unlock(&z_mutex); - - return ret; -} - -static int ffsUmountVol(struct super_block *sb) -{ - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - int err = 0; - - pr_info("[EXFAT] trying to unmount...\n"); - - mutex_lock(&z_mutex); - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - fs_sync(sb, true); - fs_set_vol_flags(sb, VOL_CLEAN); - - free_upcase_table(sb); - free_alloc_bitmap(sb); - - exfat_fat_release_all(sb); - exfat_buf_release_all(sb); - - /* close the block device */ - exfat_bdev_close(sb); - - if (p_fs->dev_ejected) { - pr_info("[EXFAT] unmounted with media errors. Device is already ejected.\n"); - err = -EIO; - } - - exfat_buf_shutdown(sb); - - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - mutex_unlock(&z_mutex); - - pr_info("[EXFAT] unmounted successfully\n"); - - return err; -} - -static int ffsGetVolInfo(struct super_block *sb, struct vol_info_t *info) -{ - int err = 0; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - - /* check the validity of pointer parameters */ - if (!info) - return -EINVAL; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - if (p_fs->used_clusters == UINT_MAX) - p_fs->used_clusters = exfat_count_used_clusters(sb); - - info->FatType = p_fs->vol_type; - info->ClusterSize = p_fs->cluster_size; - info->NumClusters = p_fs->num_clusters - 2; /* clu 0 & 1 */ - info->UsedClusters = p_fs->used_clusters; - info->FreeClusters = info->NumClusters - info->UsedClusters; - - if (p_fs->dev_ejected) - err = -EIO; - - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return err; -} - -static int ffsSyncVol(struct super_block *sb, bool do_sync) -{ - int err = 0; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - /* synchronize the file system */ - fs_sync(sb, do_sync); - fs_set_vol_flags(sb, VOL_CLEAN); - - if (p_fs->dev_ejected) - err = -EIO; - - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return err; -} - -/*----------------------------------------------------------------------*/ -/* File Operation Functions */ -/*----------------------------------------------------------------------*/ - -static int ffsLookupFile(struct inode *inode, char *path, struct file_id_t *fid) -{ - int ret, dentry, num_entries; - struct chain_t dir; - struct uni_name_t uni_name; - struct dos_name_t dos_name; - struct dentry_t *ep, *ep2; - struct entry_set_cache_t *es = NULL; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - - pr_debug("%s entered\n", __func__); - - /* check the validity of pointer parameters */ - if (!fid || !path || (*path == '\0')) - return -EINVAL; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - /* check the validity of directory name in the given pathname */ - ret = resolve_path(inode, path, &dir, &uni_name); - if (ret) - goto out; - - ret = get_num_entries_and_dos_name(sb, &dir, &uni_name, &num_entries, - &dos_name); - if (ret) - goto out; - - /* search the file name for directories */ - dentry = exfat_find_dir_entry(sb, &dir, &uni_name, num_entries, - &dos_name, TYPE_ALL); - if (dentry < -1) { - ret = -ENOENT; - goto out; - } - - fid->dir.dir = dir.dir; - fid->dir.size = dir.size; - fid->dir.flags = dir.flags; - fid->entry = dentry; - - if (dentry == -1) { - fid->type = TYPE_DIR; - fid->rwoffset = 0; - fid->hint_last_off = -1; - - fid->attr = ATTR_SUBDIR; - fid->flags = 0x01; - fid->size = 0; - fid->start_clu = p_fs->root_dir; - } else { - es = get_entry_set_in_dir(sb, &dir, dentry, - ES_2_ENTRIES, &ep); - if (!es) { - ret = -ENOENT; - goto out; - } - ep2 = ep + 1; - - fid->type = exfat_get_entry_type(ep); - fid->rwoffset = 0; - fid->hint_last_off = -1; - fid->attr = exfat_get_entry_attr(ep); - - fid->size = exfat_get_entry_size(ep2); - if ((fid->type == TYPE_FILE) && (fid->size == 0)) { - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; - fid->start_clu = CLUSTER_32(~0); - } else { - fid->flags = exfat_get_entry_flag(ep2); - fid->start_clu = exfat_get_entry_clu0(ep2); - } - - release_entry_set(es); - } - - if (p_fs->dev_ejected) - ret = -EIO; -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -static int ffsCreateFile(struct inode *inode, char *path, u8 mode, - struct file_id_t *fid) -{ - struct chain_t dir; - struct uni_name_t uni_name; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - int ret = 0; - - /* check the validity of pointer parameters */ - if (!fid || !path || (*path == '\0')) - return -EINVAL; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - /* check the validity of directory name in the given pathname */ - ret = resolve_path(inode, path, &dir, &uni_name); - if (ret) - goto out; - - fs_set_vol_flags(sb, VOL_DIRTY); - - /* create a new file */ - ret = create_file(inode, &dir, &uni_name, mode, fid); - -#ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC - fs_sync(sb, true); - fs_set_vol_flags(sb, VOL_CLEAN); -#endif - - if (p_fs->dev_ejected) - ret = -EIO; - -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -static int ffsReadFile(struct inode *inode, struct file_id_t *fid, void *buffer, - u64 count, u64 *rcount) -{ - s32 offset, sec_offset, clu_offset; - u32 clu; - int ret = 0; - sector_t LogSector; - u64 oneblkread, read_bytes; - struct buffer_head *tmp_bh = NULL; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info); - - /* check the validity of the given file id */ - if (!fid) - return -EINVAL; - - /* check the validity of pointer parameters */ - if (!buffer) - return -EINVAL; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - /* check if the given file ID is opened */ - if (fid->type != TYPE_FILE) { - ret = -EPERM; - goto out; - } - - if (fid->rwoffset > fid->size) - fid->rwoffset = fid->size; - - if (count > (fid->size - fid->rwoffset)) - count = fid->size - fid->rwoffset; - - if (count == 0) { - if (rcount) - *rcount = 0; - ret = 0; - goto out; - } - - read_bytes = 0; - - while (count > 0) { - clu_offset = (s32)(fid->rwoffset >> p_fs->cluster_size_bits); - clu = fid->start_clu; - - if (fid->flags == 0x03) { - clu += clu_offset; - } else { - /* hint information */ - if ((clu_offset > 0) && (fid->hint_last_off > 0) && - (clu_offset >= fid->hint_last_off)) { - clu_offset -= fid->hint_last_off; - clu = fid->hint_last_clu; - } - - while (clu_offset > 0) { - /* clu = exfat_fat_read(sb, clu); */ - if (exfat_fat_read(sb, clu, &clu) == -1) { - ret = -EIO; - goto out; - } - - clu_offset--; - } - } - - /* hint information */ - fid->hint_last_off = (s32)(fid->rwoffset >> - p_fs->cluster_size_bits); - fid->hint_last_clu = clu; - - /* byte offset in cluster */ - offset = (s32)(fid->rwoffset & (p_fs->cluster_size - 1)); - - /* sector offset in cluster */ - sec_offset = offset >> p_bd->sector_size_bits; - - /* byte offset in sector */ - offset &= p_bd->sector_size_mask; - - LogSector = START_SECTOR(clu) + sec_offset; - - oneblkread = (u64)(p_bd->sector_size - offset); - if (oneblkread > count) - oneblkread = count; - - if ((offset == 0) && (oneblkread == p_bd->sector_size)) { - if (sector_read(sb, LogSector, &tmp_bh, 1) != - 0) - goto err_out; - memcpy((char *)buffer + read_bytes, - (char *)tmp_bh->b_data, (s32)oneblkread); - } else { - if (sector_read(sb, LogSector, &tmp_bh, 1) != - 0) - goto err_out; - memcpy((char *)buffer + read_bytes, - (char *)tmp_bh->b_data + offset, - (s32)oneblkread); - } - count -= oneblkread; - read_bytes += oneblkread; - fid->rwoffset += oneblkread; - } - brelse(tmp_bh); - -/* How did this ever work and not leak a brlse()?? */ -err_out: - /* set the size of read bytes */ - if (rcount) - *rcount = read_bytes; - - if (p_fs->dev_ejected) - ret = -EIO; - -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -static int ffsWriteFile(struct inode *inode, struct file_id_t *fid, - void *buffer, u64 count, u64 *wcount) -{ - bool modified = false; - s32 offset, sec_offset, clu_offset; - s32 num_clusters, num_alloc, num_alloced = (s32)~0; - int ret = 0; - u32 clu, last_clu; - sector_t LogSector; - u64 oneblkwrite, write_bytes; - struct chain_t new_clu; - struct timestamp_t tm; - struct dentry_t *ep, *ep2; - struct entry_set_cache_t *es = NULL; - struct buffer_head *tmp_bh = NULL; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info); - - /* check the validity of the given file id */ - if (!fid) - return -EINVAL; - - /* check the validity of pointer parameters */ - if (!buffer) - return -EINVAL; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - /* check if the given file ID is opened */ - if (fid->type != TYPE_FILE) { - ret = -EPERM; - goto out; - } - - if (fid->rwoffset > fid->size) - fid->rwoffset = fid->size; - - if (count == 0) { - if (wcount) - *wcount = 0; - ret = 0; - goto out; - } - - fs_set_vol_flags(sb, VOL_DIRTY); - - if (fid->size == 0) - num_clusters = 0; - else - num_clusters = (s32)((fid->size - 1) >> - p_fs->cluster_size_bits) + 1; - - write_bytes = 0; - - while (count > 0) { - clu_offset = (s32)(fid->rwoffset >> p_fs->cluster_size_bits); - clu = fid->start_clu; - last_clu = fid->start_clu; - - if (fid->flags == 0x03) { - if ((clu_offset > 0) && (clu != CLUSTER_32(~0))) { - last_clu += clu_offset - 1; - - if (clu_offset == num_clusters) - clu = CLUSTER_32(~0); - else - clu += clu_offset; - } - } else { - /* hint information */ - if ((clu_offset > 0) && (fid->hint_last_off > 0) && - (clu_offset >= fid->hint_last_off)) { - clu_offset -= fid->hint_last_off; - clu = fid->hint_last_clu; - } - - while ((clu_offset > 0) && (clu != CLUSTER_32(~0))) { - last_clu = clu; - /* clu = exfat_fat_read(sb, clu); */ - if (exfat_fat_read(sb, clu, &clu) == -1) { - ret = -EIO; - goto out; - } - clu_offset--; - } - } - - if (clu == CLUSTER_32(~0)) { - num_alloc = (s32)((count - 1) >> - p_fs->cluster_size_bits) + 1; - new_clu.dir = (last_clu == CLUSTER_32(~0)) ? - CLUSTER_32(~0) : last_clu + 1; - new_clu.size = 0; - new_clu.flags = fid->flags; - - /* (1) allocate a chain of clusters */ - num_alloced = exfat_alloc_cluster(sb, - num_alloc, - &new_clu); - if (num_alloced == 0) - break; - if (num_alloced < 0) { - ret = num_alloced; - goto out; - } - - /* (2) append to the FAT chain */ - if (last_clu == CLUSTER_32(~0)) { - if (new_clu.flags == 0x01) - fid->flags = 0x01; - fid->start_clu = new_clu.dir; - modified = true; - } else { - if (new_clu.flags != fid->flags) { - exfat_chain_cont_cluster(sb, - fid->start_clu, - num_clusters); - fid->flags = 0x01; - modified = true; - } - if (new_clu.flags == 0x01) - exfat_fat_write(sb, last_clu, new_clu.dir); - } - - num_clusters += num_alloced; - clu = new_clu.dir; - } - - /* hint information */ - fid->hint_last_off = (s32)(fid->rwoffset >> - p_fs->cluster_size_bits); - fid->hint_last_clu = clu; - - /* byte offset in cluster */ - offset = (s32)(fid->rwoffset & (p_fs->cluster_size - 1)); - - /* sector offset in cluster */ - sec_offset = offset >> p_bd->sector_size_bits; - - /* byte offset in sector */ - offset &= p_bd->sector_size_mask; - - LogSector = START_SECTOR(clu) + sec_offset; - - oneblkwrite = (u64)(p_bd->sector_size - offset); - if (oneblkwrite > count) - oneblkwrite = count; - - if ((offset == 0) && (oneblkwrite == p_bd->sector_size)) { - if (sector_read(sb, LogSector, &tmp_bh, 0) != - 0) - goto err_out; - memcpy((char *)tmp_bh->b_data, - (char *)buffer + write_bytes, (s32)oneblkwrite); - if (sector_write(sb, LogSector, tmp_bh, 0) != - 0) { - brelse(tmp_bh); - goto err_out; - } - } else { - if ((offset > 0) || - ((fid->rwoffset + oneblkwrite) < fid->size)) { - if (sector_read(sb, LogSector, &tmp_bh, 1) != - 0) - goto err_out; - } else { - if (sector_read(sb, LogSector, &tmp_bh, 0) != - 0) - goto err_out; - } - - memcpy((char *)tmp_bh->b_data + offset, - (char *)buffer + write_bytes, (s32)oneblkwrite); - if (sector_write(sb, LogSector, tmp_bh, 0) != - 0) { - brelse(tmp_bh); - goto err_out; - } - } - - count -= oneblkwrite; - write_bytes += oneblkwrite; - fid->rwoffset += oneblkwrite; - - fid->attr |= ATTR_ARCHIVE; - - if (fid->size < fid->rwoffset) { - fid->size = fid->rwoffset; - modified = true; - } - } - - brelse(tmp_bh); - - /* (3) update the direcoty entry */ - es = get_entry_set_in_dir(sb, &fid->dir, fid->entry, - ES_ALL_ENTRIES, &ep); - if (!es) - goto err_out; - ep2 = ep + 1; - - exfat_set_entry_time(ep, tm_current(&tm), TM_MODIFY); - exfat_set_entry_attr(ep, fid->attr); - - if (modified) { - if (exfat_get_entry_flag(ep2) != fid->flags) - exfat_set_entry_flag(ep2, fid->flags); - - if (exfat_get_entry_size(ep2) != fid->size) - exfat_set_entry_size(ep2, fid->size); - - if (exfat_get_entry_clu0(ep2) != fid->start_clu) - exfat_set_entry_clu0(ep2, fid->start_clu); - } - - update_dir_checksum_with_entry_set(sb, es); - release_entry_set(es); - -#ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC - fs_sync(sb, true); - fs_set_vol_flags(sb, VOL_CLEAN); -#endif - -err_out: - /* set the size of written bytes */ - if (wcount) - *wcount = write_bytes; - - if (num_alloced == 0) - ret = -ENOSPC; - - else if (p_fs->dev_ejected) - ret = -EIO; - -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -static int ffsTruncateFile(struct inode *inode, u64 old_size, u64 new_size) -{ - s32 num_clusters; - u32 last_clu = CLUSTER_32(0); - int ret = 0; - struct chain_t clu; - struct timestamp_t tm; - struct dentry_t *ep, *ep2; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct file_id_t *fid = &(EXFAT_I(inode)->fid); - struct entry_set_cache_t *es = NULL; - - pr_debug("%s entered (inode %p size %llu)\n", __func__, inode, - new_size); - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - /* check if the given file ID is opened */ - if (fid->type != TYPE_FILE) { - ret = -EPERM; - goto out; - } - - if (fid->size != old_size) { - pr_err("[EXFAT] truncate : can't skip it because of size-mismatch(old:%lld->fid:%lld).\n", - old_size, fid->size); - } - - if (old_size <= new_size) { - ret = 0; - goto out; - } - - fs_set_vol_flags(sb, VOL_DIRTY); - - clu.dir = fid->start_clu; - clu.size = (s32)((old_size - 1) >> p_fs->cluster_size_bits) + 1; - clu.flags = fid->flags; - - if (new_size > 0) { - num_clusters = (s32)((new_size - 1) >> - p_fs->cluster_size_bits) + 1; - - if (clu.flags == 0x03) { - clu.dir += num_clusters; - } else { - while (num_clusters > 0) { - last_clu = clu.dir; - if (exfat_fat_read(sb, clu.dir, &clu.dir) == -1) { - ret = -EIO; - goto out; - } - num_clusters--; - } - } - - clu.size -= num_clusters; - } - - fid->size = new_size; - fid->attr |= ATTR_ARCHIVE; - if (new_size == 0) { - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; - fid->start_clu = CLUSTER_32(~0); - } - - /* (1) update the directory entry */ - es = get_entry_set_in_dir(sb, &fid->dir, fid->entry, - ES_ALL_ENTRIES, &ep); - if (!es) { - ret = -ENOENT; - goto out; - } - ep2 = ep + 1; - - exfat_set_entry_time(ep, tm_current(&tm), TM_MODIFY); - exfat_set_entry_attr(ep, fid->attr); - - exfat_set_entry_size(ep2, new_size); - if (new_size == 0) { - exfat_set_entry_flag(ep2, 0x01); - exfat_set_entry_clu0(ep2, CLUSTER_32(0)); - } - - update_dir_checksum_with_entry_set(sb, es); - release_entry_set(es); - - /* (2) cut off from the FAT chain */ - if (last_clu != CLUSTER_32(0)) { - if (fid->flags == 0x01) - exfat_fat_write(sb, last_clu, CLUSTER_32(~0)); - } - - /* (3) free the clusters */ - exfat_free_cluster(sb, &clu, 0); - - /* hint information */ - fid->hint_last_off = -1; - if (fid->rwoffset > fid->size) - fid->rwoffset = fid->size; - -#ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC - fs_sync(sb, true); - fs_set_vol_flags(sb, VOL_CLEAN); -#endif - - if (p_fs->dev_ejected) - ret = -EIO; - -out: - pr_debug("%s exited (%d)\n", __func__, ret); - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -static void update_parent_info(struct file_id_t *fid, - struct inode *parent_inode) -{ - struct fs_info_t *p_fs = &(EXFAT_SB(parent_inode->i_sb)->fs_info); - struct file_id_t *parent_fid = &(EXFAT_I(parent_inode)->fid); - - if (unlikely((parent_fid->flags != fid->dir.flags) || - (parent_fid->size != - (fid->dir.size << p_fs->cluster_size_bits)) || - (parent_fid->start_clu != fid->dir.dir))) { - fid->dir.dir = parent_fid->start_clu; - fid->dir.flags = parent_fid->flags; - fid->dir.size = ((parent_fid->size + (p_fs->cluster_size - 1)) - >> p_fs->cluster_size_bits); - } -} - -static int ffsMoveFile(struct inode *old_parent_inode, struct file_id_t *fid, - struct inode *new_parent_inode, struct dentry *new_dentry) -{ - s32 ret; - s32 dentry; - struct chain_t olddir, newdir; - struct chain_t *p_dir = NULL; - struct uni_name_t uni_name; - struct dentry_t *ep; - struct super_block *sb = old_parent_inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - u8 *new_path = (u8 *)new_dentry->d_name.name; - struct inode *new_inode = new_dentry->d_inode; - int num_entries; - struct file_id_t *new_fid = NULL; - s32 new_entry = 0; - - /* check the validity of the given file id */ - if (!fid) - return -EINVAL; - - /* check the validity of pointer parameters */ - if (!new_path || (*new_path == '\0')) - return -EINVAL; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - update_parent_info(fid, old_parent_inode); - - olddir.dir = fid->dir.dir; - olddir.size = fid->dir.size; - olddir.flags = fid->dir.flags; - - dentry = fid->entry; - - /* check if the old file is "." or ".." */ - if (p_fs->vol_type != EXFAT) { - if ((olddir.dir != p_fs->root_dir) && (dentry < 2)) { - ret = -EPERM; - goto out2; - } - } - - ep = get_entry_in_dir(sb, &olddir, dentry, NULL); - if (!ep) { - ret = -ENOENT; - goto out2; - } - - if (exfat_get_entry_attr(ep) & ATTR_READONLY) { - ret = -EPERM; - goto out2; - } - - /* check whether new dir is existing directory and empty */ - if (new_inode) { - u32 entry_type; - - ret = -ENOENT; - new_fid = &EXFAT_I(new_inode)->fid; - - update_parent_info(new_fid, new_parent_inode); - - p_dir = &new_fid->dir; - new_entry = new_fid->entry; - ep = get_entry_in_dir(sb, p_dir, new_entry, NULL); - if (!ep) - goto out; - - entry_type = exfat_get_entry_type(ep); - - if (entry_type == TYPE_DIR) { - struct chain_t new_clu; - - new_clu.dir = new_fid->start_clu; - new_clu.size = (s32)((new_fid->size - 1) >> - p_fs->cluster_size_bits) + 1; - new_clu.flags = new_fid->flags; - - if (!is_dir_empty(sb, &new_clu)) { - ret = -EEXIST; - goto out; - } - } - } - - /* check the validity of directory name in the given new pathname */ - ret = resolve_path(new_parent_inode, new_path, &newdir, &uni_name); - if (ret) - goto out2; - - fs_set_vol_flags(sb, VOL_DIRTY); - - if (olddir.dir == newdir.dir) - ret = exfat_rename_file(new_parent_inode, &olddir, dentry, - &uni_name, fid); - else - ret = move_file(new_parent_inode, &olddir, dentry, &newdir, - &uni_name, fid); - - if ((ret == 0) && new_inode) { - /* delete entries of new_dir */ - ep = get_entry_in_dir(sb, p_dir, new_entry, NULL); - if (!ep) - goto out; - - num_entries = exfat_count_ext_entries(sb, p_dir, - new_entry, ep); - if (num_entries < 0) - goto out; - exfat_delete_dir_entry(sb, p_dir, new_entry, 0, - num_entries + 1); - } -out: -#ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC - fs_sync(sb, true); - fs_set_vol_flags(sb, VOL_CLEAN); -#endif - - if (p_fs->dev_ejected) - ret = -EIO; -out2: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -static int ffsRemoveFile(struct inode *inode, struct file_id_t *fid) -{ - s32 dentry; - int ret = 0; - struct chain_t dir, clu_to_free; - struct dentry_t *ep; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - - /* check the validity of the given file id */ - if (!fid) - return -EINVAL; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - dir.dir = fid->dir.dir; - dir.size = fid->dir.size; - dir.flags = fid->dir.flags; - - dentry = fid->entry; - - ep = get_entry_in_dir(sb, &dir, dentry, NULL); - if (!ep) { - ret = -ENOENT; - goto out; - } - - if (exfat_get_entry_attr(ep) & ATTR_READONLY) { - ret = -EPERM; - goto out; - } - fs_set_vol_flags(sb, VOL_DIRTY); - - /* (1) update the directory entry */ - remove_file(inode, &dir, dentry); - - clu_to_free.dir = fid->start_clu; - clu_to_free.size = (s32)((fid->size - 1) >> p_fs->cluster_size_bits) + 1; - clu_to_free.flags = fid->flags; - - /* (2) free the clusters */ - exfat_free_cluster(sb, &clu_to_free, 0); - - fid->size = 0; - fid->start_clu = CLUSTER_32(~0); - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; - -#ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC - fs_sync(sb, true); - fs_set_vol_flags(sb, VOL_CLEAN); -#endif - - if (p_fs->dev_ejected) - ret = -EIO; -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -#if 0 -/* Not currently wired up */ -static int ffsSetAttr(struct inode *inode, u32 attr) -{ - u32 type; - int ret = 0; - sector_t sector = 0; - struct dentry_t *ep; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct file_id_t *fid = &(EXFAT_I(inode)->fid); - u8 is_dir = (fid->type == TYPE_DIR) ? 1 : 0; - struct entry_set_cache_t *es = NULL; - - if (fid->attr == attr) { - if (p_fs->dev_ejected) - return -EIO; - return 0; - } - - if (is_dir) { - if ((fid->dir.dir == p_fs->root_dir) && - (fid->entry == -1)) { - if (p_fs->dev_ejected) - return -EIO; - return 0; - } - } - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - /* get the directory entry of given file */ - es = get_entry_set_in_dir(sb, &fid->dir, fid->entry, - ES_ALL_ENTRIES, &ep); - if (!es) { - ret = -ENOENT; - goto out; - } - - type = exfat_get_entry_type(ep); - - if (((type == TYPE_FILE) && (attr & ATTR_SUBDIR)) || - ((type == TYPE_DIR) && (!(attr & ATTR_SUBDIR)))) { - if (p_fs->dev_ejected) - ret = -EIO; - else - ret = -EINVAL; - - release_entry_set(es); - goto out; - } - - fs_set_vol_flags(sb, VOL_DIRTY); - - /* set the file attribute */ - fid->attr = attr; - exfat_set_entry_attr(ep, attr); - - update_dir_checksum_with_entry_set(sb, es); - release_entry_set(es); - -#ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC - fs_sync(sb, true); - fs_set_vol_flags(sb, VOL_CLEAN); -#endif - - if (p_fs->dev_ejected) - ret = -EIO; -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} -#endif - -static int ffsReadStat(struct inode *inode, struct dir_entry_t *info) -{ - s32 count; - int ret = 0; - struct chain_t dir; - struct uni_name_t uni_name; - struct timestamp_t tm; - struct dentry_t *ep, *ep2; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct file_id_t *fid = &(EXFAT_I(inode)->fid); - struct entry_set_cache_t *es = NULL; - u8 is_dir = (fid->type == TYPE_DIR) ? 1 : 0; - - pr_debug("%s entered\n", __func__); - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - if (is_dir) { - if ((fid->dir.dir == p_fs->root_dir) && - (fid->entry == -1)) { - info->Attr = ATTR_SUBDIR; - memset((char *)&info->CreateTimestamp, 0, - sizeof(struct date_time_t)); - memset((char *)&info->ModifyTimestamp, 0, - sizeof(struct date_time_t)); - memset((char *)&info->AccessTimestamp, 0, - sizeof(struct date_time_t)); - strcpy(info->ShortName, "."); - strcpy(info->Name, "."); - - dir.dir = p_fs->root_dir; - dir.flags = 0x01; - - if (p_fs->root_dir == CLUSTER_32(0)) { - /* FAT16 root_dir */ - info->Size = p_fs->dentries_in_root << - DENTRY_SIZE_BITS; - } else { - info->Size = count_num_clusters(sb, &dir) << - p_fs->cluster_size_bits; - } - - count = count_dos_name_entries(sb, &dir, TYPE_DIR); - if (count < 0) { - ret = count; /* propagate error upward */ - goto out; - } - info->NumSubdirs = count; - - if (p_fs->dev_ejected) - ret = -EIO; - goto out; - } - } - - /* get the directory entry of given file or directory */ - es = get_entry_set_in_dir(sb, &fid->dir, fid->entry, - ES_2_ENTRIES, &ep); - if (!es) { - ret = -ENOENT; - goto out; - } - ep2 = ep + 1; - - /* set FILE_INFO structure using the acquired struct dentry_t */ - info->Attr = exfat_get_entry_attr(ep); - - exfat_get_entry_time(ep, &tm, TM_CREATE); - info->CreateTimestamp.Year = tm.year; - info->CreateTimestamp.Month = tm.mon; - info->CreateTimestamp.Day = tm.day; - info->CreateTimestamp.Hour = tm.hour; - info->CreateTimestamp.Minute = tm.min; - info->CreateTimestamp.Second = tm.sec; - info->CreateTimestamp.MilliSecond = 0; - - exfat_get_entry_time(ep, &tm, TM_MODIFY); - info->ModifyTimestamp.Year = tm.year; - info->ModifyTimestamp.Month = tm.mon; - info->ModifyTimestamp.Day = tm.day; - info->ModifyTimestamp.Hour = tm.hour; - info->ModifyTimestamp.Minute = tm.min; - info->ModifyTimestamp.Second = tm.sec; - info->ModifyTimestamp.MilliSecond = 0; - - memset((char *)&info->AccessTimestamp, 0, sizeof(struct date_time_t)); - - *uni_name.name = 0x0; - /* XXX this is very bad for exfat cuz name is already included in es. - * API should be revised - */ - exfat_get_uni_name_from_ext_entry(sb, &fid->dir, fid->entry, - uni_name.name); - nls_uniname_to_cstring(sb, info->Name, &uni_name); - - info->NumSubdirs = 2; - - info->Size = exfat_get_entry_size(ep2); - - release_entry_set(es); - - if (is_dir) { - dir.dir = fid->start_clu; - dir.flags = 0x01; - - if (info->Size == 0) - info->Size = (u64)count_num_clusters(sb, &dir) << - p_fs->cluster_size_bits; - - count = count_dos_name_entries(sb, &dir, TYPE_DIR); - if (count < 0) { - ret = count; /* propagate error upward */ - goto out; - } - info->NumSubdirs += count; - } - - if (p_fs->dev_ejected) - ret = -EIO; - -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - pr_debug("%s exited successfully\n", __func__); - return ret; -} - -static int ffsWriteStat(struct inode *inode, struct dir_entry_t *info) -{ - int ret = 0; - struct timestamp_t tm; - struct dentry_t *ep, *ep2; - struct entry_set_cache_t *es = NULL; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct file_id_t *fid = &(EXFAT_I(inode)->fid); - u8 is_dir = (fid->type == TYPE_DIR) ? 1 : 0; - - pr_debug("%s entered (inode %p info %p\n", __func__, inode, info); - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - if (is_dir) { - if ((fid->dir.dir == p_fs->root_dir) && - (fid->entry == -1)) { - if (p_fs->dev_ejected) - ret = -EIO; - ret = 0; - goto out; - } - } - - fs_set_vol_flags(sb, VOL_DIRTY); - - /* get the directory entry of given file or directory */ - es = get_entry_set_in_dir(sb, &fid->dir, fid->entry, - ES_ALL_ENTRIES, &ep); - if (!es) { - ret = -ENOENT; - goto out; - } - ep2 = ep + 1; - - exfat_set_entry_attr(ep, info->Attr); - - /* set FILE_INFO structure using the acquired struct dentry_t */ - tm.sec = info->CreateTimestamp.Second; - tm.min = info->CreateTimestamp.Minute; - tm.hour = info->CreateTimestamp.Hour; - tm.day = info->CreateTimestamp.Day; - tm.mon = info->CreateTimestamp.Month; - tm.year = info->CreateTimestamp.Year; - exfat_set_entry_time(ep, &tm, TM_CREATE); - - tm.sec = info->ModifyTimestamp.Second; - tm.min = info->ModifyTimestamp.Minute; - tm.hour = info->ModifyTimestamp.Hour; - tm.day = info->ModifyTimestamp.Day; - tm.mon = info->ModifyTimestamp.Month; - tm.year = info->ModifyTimestamp.Year; - exfat_set_entry_time(ep, &tm, TM_MODIFY); - - exfat_set_entry_size(ep2, info->Size); - - update_dir_checksum_with_entry_set(sb, es); - release_entry_set(es); - - if (p_fs->dev_ejected) - ret = -EIO; - -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - pr_debug("%s exited (%d)\n", __func__, ret); - - return ret; -} - -static int ffsMapCluster(struct inode *inode, s32 clu_offset, u32 *clu) -{ - s32 num_clusters, num_alloced; - bool modified = false; - u32 last_clu; - int ret = 0; - struct chain_t new_clu; - struct dentry_t *ep; - struct entry_set_cache_t *es = NULL; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct file_id_t *fid = &(EXFAT_I(inode)->fid); - - /* check the validity of pointer parameters */ - if (!clu) - return -EINVAL; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - fid->rwoffset = (s64)(clu_offset) << p_fs->cluster_size_bits; - - if (EXFAT_I(inode)->mmu_private == 0) - num_clusters = 0; - else - num_clusters = (s32)((EXFAT_I(inode)->mmu_private - 1) >> - p_fs->cluster_size_bits) + 1; - - *clu = last_clu = fid->start_clu; - - if (fid->flags == 0x03) { - if ((clu_offset > 0) && (*clu != CLUSTER_32(~0))) { - last_clu += clu_offset - 1; - - if (clu_offset == num_clusters) - *clu = CLUSTER_32(~0); - else - *clu += clu_offset; - } - } else { - /* hint information */ - if ((clu_offset > 0) && (fid->hint_last_off > 0) && - (clu_offset >= fid->hint_last_off)) { - clu_offset -= fid->hint_last_off; - *clu = fid->hint_last_clu; - } - - while ((clu_offset > 0) && (*clu != CLUSTER_32(~0))) { - last_clu = *clu; - if (exfat_fat_read(sb, *clu, clu) == -1) { - ret = -EIO; - goto out; - } - clu_offset--; - } - } - - if (*clu == CLUSTER_32(~0)) { - fs_set_vol_flags(sb, VOL_DIRTY); - - new_clu.dir = (last_clu == CLUSTER_32(~0)) ? CLUSTER_32(~0) : - last_clu + 1; - new_clu.size = 0; - new_clu.flags = fid->flags; - - /* (1) allocate a cluster */ - num_alloced = exfat_alloc_cluster(sb, 1, &new_clu); - if (num_alloced < 0) { - ret = -EIO; - goto out; - } else if (num_alloced == 0) { - ret = -ENOSPC; - goto out; - } - - /* (2) append to the FAT chain */ - if (last_clu == CLUSTER_32(~0)) { - if (new_clu.flags == 0x01) - fid->flags = 0x01; - fid->start_clu = new_clu.dir; - modified = true; - } else { - if (new_clu.flags != fid->flags) { - exfat_chain_cont_cluster(sb, fid->start_clu, - num_clusters); - fid->flags = 0x01; - modified = true; - } - if (new_clu.flags == 0x01) - exfat_fat_write(sb, last_clu, new_clu.dir); - } - - num_clusters += num_alloced; - *clu = new_clu.dir; - - es = get_entry_set_in_dir(sb, &fid->dir, fid->entry, - ES_ALL_ENTRIES, &ep); - if (!es) { - ret = -ENOENT; - goto out; - } - /* get stream entry */ - ep++; - - /* (3) update directory entry */ - if (modified) { - if (exfat_get_entry_flag(ep) != fid->flags) - exfat_set_entry_flag(ep, fid->flags); - - if (exfat_get_entry_clu0(ep) != fid->start_clu) - exfat_set_entry_clu0(ep, fid->start_clu); - } - - update_dir_checksum_with_entry_set(sb, es); - release_entry_set(es); - - /* add number of new blocks to inode */ - inode->i_blocks += num_alloced << (p_fs->cluster_size_bits - 9); - } - - /* hint information */ - fid->hint_last_off = (s32)(fid->rwoffset >> p_fs->cluster_size_bits); - fid->hint_last_clu = *clu; - - if (p_fs->dev_ejected) - ret = -EIO; - -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -/*----------------------------------------------------------------------*/ -/* Directory Operation Functions */ -/*----------------------------------------------------------------------*/ - -static int ffsCreateDir(struct inode *inode, char *path, struct file_id_t *fid) -{ - int ret = 0; - struct chain_t dir; - struct uni_name_t uni_name; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - - pr_debug("%s entered\n", __func__); - - /* check the validity of pointer parameters */ - if (!fid || !path || (*path == '\0')) - return -EINVAL; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - /* check the validity of directory name in the given old pathname */ - ret = resolve_path(inode, path, &dir, &uni_name); - if (ret) - goto out; - - fs_set_vol_flags(sb, VOL_DIRTY); - - ret = create_dir(inode, &dir, &uni_name, fid); - -#ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC - fs_sync(sb, true); - fs_set_vol_flags(sb, VOL_CLEAN); -#endif - - if (p_fs->dev_ejected) - ret = -EIO; -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -static int ffsReadDir(struct inode *inode, struct dir_entry_t *dir_entry) -{ - int i, dentry, clu_offset; - int ret = 0; - s32 dentries_per_clu, dentries_per_clu_bits = 0; - u32 type; - sector_t sector; - struct chain_t dir, clu; - struct uni_name_t uni_name; - struct timestamp_t tm; - struct dentry_t *ep; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct file_id_t *fid = &(EXFAT_I(inode)->fid); - - /* check the validity of pointer parameters */ - if (!dir_entry) - return -EINVAL; - - /* check if the given file ID is opened */ - if (fid->type != TYPE_DIR) - return -ENOTDIR; - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - if (fid->entry == -1) { - dir.dir = p_fs->root_dir; - dir.flags = 0x01; - } else { - dir.dir = fid->start_clu; - dir.size = (s32)(fid->size >> p_fs->cluster_size_bits); - dir.flags = fid->flags; - } - - dentry = (s32)fid->rwoffset; - - if (dir.dir == CLUSTER_32(0)) { - /* FAT16 root_dir */ - dentries_per_clu = p_fs->dentries_in_root; - - if (dentry == dentries_per_clu) { - clu.dir = CLUSTER_32(~0); - } else { - clu.dir = dir.dir; - clu.size = dir.size; - clu.flags = dir.flags; - } - } else { - dentries_per_clu = p_fs->dentries_per_clu; - dentries_per_clu_bits = ilog2(dentries_per_clu); - - clu_offset = dentry >> dentries_per_clu_bits; - clu.dir = dir.dir; - clu.size = dir.size; - clu.flags = dir.flags; - - if (clu.flags == 0x03) { - clu.dir += clu_offset; - clu.size -= clu_offset; - } else { - /* hint_information */ - if ((clu_offset > 0) && (fid->hint_last_off > 0) && - (clu_offset >= fid->hint_last_off)) { - clu_offset -= fid->hint_last_off; - clu.dir = fid->hint_last_clu; - } - - while (clu_offset > 0) { - /* clu.dir = exfat_fat_read(sb, clu.dir); */ - if (exfat_fat_read(sb, clu.dir, &clu.dir) == -1) { - ret = -EIO; - goto out; - } - clu_offset--; - } - } - } - - while (clu.dir != CLUSTER_32(~0)) { - if (p_fs->dev_ejected) - break; - - if (dir.dir == CLUSTER_32(0)) /* FAT16 root_dir */ - i = dentry % dentries_per_clu; - else - i = dentry & (dentries_per_clu - 1); - - for ( ; i < dentries_per_clu; i++, dentry++) { - ep = get_entry_in_dir(sb, &clu, i, §or); - if (!ep) { - ret = -ENOENT; - goto out; - } - type = exfat_get_entry_type(ep); - - if (type == TYPE_UNUSED) - break; - - if ((type != TYPE_FILE) && (type != TYPE_DIR)) - continue; - - exfat_buf_lock(sb, sector); - dir_entry->Attr = exfat_get_entry_attr(ep); - - exfat_get_entry_time(ep, &tm, TM_CREATE); - dir_entry->CreateTimestamp.Year = tm.year; - dir_entry->CreateTimestamp.Month = tm.mon; - dir_entry->CreateTimestamp.Day = tm.day; - dir_entry->CreateTimestamp.Hour = tm.hour; - dir_entry->CreateTimestamp.Minute = tm.min; - dir_entry->CreateTimestamp.Second = tm.sec; - dir_entry->CreateTimestamp.MilliSecond = 0; - - exfat_get_entry_time(ep, &tm, TM_MODIFY); - dir_entry->ModifyTimestamp.Year = tm.year; - dir_entry->ModifyTimestamp.Month = tm.mon; - dir_entry->ModifyTimestamp.Day = tm.day; - dir_entry->ModifyTimestamp.Hour = tm.hour; - dir_entry->ModifyTimestamp.Minute = tm.min; - dir_entry->ModifyTimestamp.Second = tm.sec; - dir_entry->ModifyTimestamp.MilliSecond = 0; - - memset((char *)&dir_entry->AccessTimestamp, 0, - sizeof(struct date_time_t)); - - *uni_name.name = 0x0; - exfat_get_uni_name_from_ext_entry(sb, &dir, dentry, - uni_name.name); - nls_uniname_to_cstring(sb, dir_entry->Name, &uni_name); - exfat_buf_unlock(sb, sector); - - ep = get_entry_in_dir(sb, &clu, i + 1, NULL); - if (!ep) { - ret = -ENOENT; - goto out; - } - - dir_entry->Size = exfat_get_entry_size(ep); - - /* hint information */ - if (dir.dir == CLUSTER_32(0)) { /* FAT16 root_dir */ - } else { - fid->hint_last_off = dentry >> - dentries_per_clu_bits; - fid->hint_last_clu = clu.dir; - } - - fid->rwoffset = (s64)(++dentry); - - if (p_fs->dev_ejected) - ret = -EIO; - goto out; - } - - if (dir.dir == CLUSTER_32(0)) - break; /* FAT16 root_dir */ - - if (clu.flags == 0x03) { - if ((--clu.size) > 0) - clu.dir++; - else - clu.dir = CLUSTER_32(~0); - } else { - /* clu.dir = exfat_fat_read(sb, clu.dir); */ - if (exfat_fat_read(sb, clu.dir, &clu.dir) == -1) { - ret = -EIO; - goto out; - } - } - } - - *dir_entry->Name = '\0'; - - fid->rwoffset = (s64)(++dentry); - - if (p_fs->dev_ejected) - ret = -EIO; - -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -static int ffsRemoveDir(struct inode *inode, struct file_id_t *fid) -{ - s32 dentry; - int ret = 0; - struct chain_t dir, clu_to_free; - struct super_block *sb = inode->i_sb; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - - /* check the validity of the given file id */ - if (!fid) - return -EINVAL; - - dir.dir = fid->dir.dir; - dir.size = fid->dir.size; - dir.flags = fid->dir.flags; - - dentry = fid->entry; - - /* check if the file is "." or ".." */ - if (p_fs->vol_type != EXFAT) { - if ((dir.dir != p_fs->root_dir) && (dentry < 2)) - return -EPERM; - } - - /* acquire the lock for file system critical section */ - mutex_lock(&p_fs->v_mutex); - - clu_to_free.dir = fid->start_clu; - clu_to_free.size = (s32)((fid->size - 1) >> p_fs->cluster_size_bits) + 1; - clu_to_free.flags = fid->flags; - - if (!is_dir_empty(sb, &clu_to_free)) { - ret = -ENOTEMPTY; - goto out; - } - - fs_set_vol_flags(sb, VOL_DIRTY); - - /* (1) update the directory entry */ - remove_file(inode, &dir, dentry); - - /* (2) free the clusters */ - exfat_free_cluster(sb, &clu_to_free, 1); - - fid->size = 0; - fid->start_clu = CLUSTER_32(~0); - fid->flags = (p_fs->vol_type == EXFAT) ? 0x03 : 0x01; - -#ifndef CONFIG_STAGING_EXFAT_DELAYED_SYNC - fs_sync(sb, true); - fs_set_vol_flags(sb, VOL_CLEAN); -#endif - - if (p_fs->dev_ejected) - ret = -EIO; - -out: - /* release the lock for file system critical section */ - mutex_unlock(&p_fs->v_mutex); - - return ret; -} - -/*======================================================================*/ -/* Directory Entry Operations */ -/*======================================================================*/ - -static int exfat_readdir(struct file *filp, struct dir_context *ctx) -{ - struct inode *inode = file_inode(filp); - struct super_block *sb = inode->i_sb; - struct exfat_sb_info *sbi = EXFAT_SB(sb); - struct fs_info_t *p_fs = &sbi->fs_info; - struct bd_info_t *p_bd = &(EXFAT_SB(sb)->bd_info); - struct dir_entry_t de; - unsigned long inum; - loff_t cpos; - int err = 0; - - __lock_super(sb); - - cpos = ctx->pos; - /* Fake . and .. for the root directory. */ - if ((p_fs->vol_type == EXFAT) || (inode->i_ino == EXFAT_ROOT_INO)) { - while (cpos < 2) { - if (inode->i_ino == EXFAT_ROOT_INO) - inum = EXFAT_ROOT_INO; - else if (cpos == 0) - inum = inode->i_ino; - else /* (cpos == 1) */ - inum = parent_ino(filp->f_path.dentry); - - if (!dir_emit_dots(filp, ctx)) - goto out; - cpos++; - ctx->pos++; - } - if (cpos == 2) - cpos = 0; - } - if (cpos & (DENTRY_SIZE - 1)) { - err = -ENOENT; - goto out; - } - -get_new: - EXFAT_I(inode)->fid.size = i_size_read(inode); - EXFAT_I(inode)->fid.rwoffset = cpos >> DENTRY_SIZE_BITS; - - err = ffsReadDir(inode, &de); - if (err) { - /* at least we tried to read a sector - * move cpos to next sector position (should be aligned) - */ - if (err == -EIO) { - cpos += 1 << p_bd->sector_size_bits; - cpos &= ~((1 << p_bd->sector_size_bits) - 1); - } - - goto end_of_dir; - } - - cpos = EXFAT_I(inode)->fid.rwoffset << DENTRY_SIZE_BITS; - - if (!de.Name[0]) - goto end_of_dir; - - if (!memcmp(de.ShortName, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) { - inum = inode->i_ino; - } else if (!memcmp(de.ShortName, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH)) { - inum = parent_ino(filp->f_path.dentry); - } else { - loff_t i_pos = ((loff_t)EXFAT_I(inode)->fid.start_clu << 32) | - ((EXFAT_I(inode)->fid.rwoffset - 1) & 0xffffffff); - struct inode *tmp = exfat_iget(sb, i_pos); - - if (tmp) { - inum = tmp->i_ino; - iput(tmp); - } else { - inum = iunique(sb, EXFAT_ROOT_INO); - } - } - - if (!dir_emit(ctx, de.Name, strlen(de.Name), inum, - (de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG)) - goto out; - - ctx->pos = cpos; - goto get_new; - -end_of_dir: - ctx->pos = cpos; -out: - __unlock_super(sb); - return err; -} - -static int exfat_ioctl_volume_id(struct inode *dir) -{ - struct super_block *sb = dir->i_sb; - struct exfat_sb_info *sbi = EXFAT_SB(sb); - struct fs_info_t *p_fs = &sbi->fs_info; - - return p_fs->vol_id; -} - -static long exfat_generic_ioctl(struct file *filp, unsigned int cmd, - unsigned long arg) -{ - struct inode *inode = filp->f_path.dentry->d_inode; -#ifdef CONFIG_STAGING_EXFAT_KERNEL_DEBUG - unsigned int flags; -#endif /* CONFIG_STAGING_EXFAT_KERNEL_DEBUG */ - - switch (cmd) { - case EXFAT_IOCTL_GET_VOLUME_ID: - return exfat_ioctl_volume_id(inode); -#ifdef CONFIG_STAGING_EXFAT_KERNEL_DEBUG - case EXFAT_IOC_GET_DEBUGFLAGS: { - struct super_block *sb = inode->i_sb; - struct exfat_sb_info *sbi = EXFAT_SB(sb); - - flags = sbi->debug_flags; - return put_user(flags, (int __user *)arg); - } - case EXFAT_IOC_SET_DEBUGFLAGS: { - struct super_block *sb = inode->i_sb; - struct exfat_sb_info *sbi = EXFAT_SB(sb); - - if (!capable(CAP_SYS_ADMIN)) - return -EPERM; - - if (get_user(flags, (int __user *)arg)) - return -EFAULT; - - __lock_super(sb); - sbi->debug_flags = flags; - __unlock_super(sb); - - return 0; - } -#endif /* CONFIG_STAGING_EXFAT_KERNEL_DEBUG */ - default: - return -ENOTTY; /* Inappropriate ioctl for device */ - } -} - -static const struct file_operations exfat_dir_operations = { - .llseek = generic_file_llseek, - .read = generic_read_dir, - .iterate = exfat_readdir, - .unlocked_ioctl = exfat_generic_ioctl, - .fsync = generic_file_fsync, -}; - -static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, - bool excl) -{ - struct super_block *sb = dir->i_sb; - struct timespec64 curtime; - struct inode *inode; - struct file_id_t fid; - loff_t i_pos; - int err; - - __lock_super(sb); - - pr_debug("%s entered\n", __func__); - - err = ffsCreateFile(dir, (u8 *)dentry->d_name.name, FM_REGULAR, &fid); - if (err) - goto out; - - INC_IVERSION(dir); - curtime = current_time(dir); - dir->i_ctime = curtime; - dir->i_mtime = curtime; - dir->i_atime = curtime; - if (IS_DIRSYNC(dir)) - (void)exfat_sync_inode(dir); - else - mark_inode_dirty(dir); - - i_pos = ((loff_t)fid.dir.dir << 32) | (fid.entry & 0xffffffff); - - inode = exfat_build_inode(sb, &fid, i_pos); - if (IS_ERR(inode)) { - err = PTR_ERR(inode); - goto out; - } - INC_IVERSION(inode); - curtime = current_time(inode); - inode->i_mtime = curtime; - inode->i_atime = curtime; - inode->i_ctime = curtime; - /* - * timestamp is already written, so mark_inode_dirty() is unnecessary. - */ - - dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode); - d_instantiate(dentry, inode); - -out: - __unlock_super(sb); - pr_debug("%s exited\n", __func__); - return err; -} - -static int exfat_find(struct inode *dir, struct qstr *qname, - struct file_id_t *fid) -{ - int err; - - if (qname->len == 0) - return -ENOENT; - - err = ffsLookupFile(dir, (u8 *)qname->name, fid); - if (err) - return -ENOENT; - - return 0; -} - -static int exfat_d_anon_disconn(struct dentry *dentry) -{ - return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); -} - -static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, - unsigned int flags) -{ - struct super_block *sb = dir->i_sb; - struct inode *inode; - struct dentry *alias; - int err; - struct file_id_t fid; - loff_t i_pos; - u64 ret; - mode_t i_mode; - - __lock_super(sb); - pr_debug("%s entered\n", __func__); - err = exfat_find(dir, &dentry->d_name, &fid); - if (err) { - if (err == -ENOENT) { - inode = NULL; - goto out; - } - goto error; - } - - i_pos = ((loff_t)fid.dir.dir << 32) | (fid.entry & 0xffffffff); - inode = exfat_build_inode(sb, &fid, i_pos); - if (IS_ERR(inode)) { - err = PTR_ERR(inode); - goto error; - } - - i_mode = inode->i_mode; - if (S_ISLNK(i_mode) && !EXFAT_I(inode)->target) { - EXFAT_I(inode)->target = kmalloc(i_size_read(inode) + 1, - GFP_KERNEL); - if (!EXFAT_I(inode)->target) { - err = -ENOMEM; - goto error; - } - ffsReadFile(dir, &fid, EXFAT_I(inode)->target, - i_size_read(inode), &ret); - *(EXFAT_I(inode)->target + i_size_read(inode)) = '\0'; - } - - alias = d_find_alias(inode); - if (alias && !exfat_d_anon_disconn(alias)) { - BUG_ON(d_unhashed(alias)); - if (!S_ISDIR(i_mode)) - d_move(alias, dentry); - iput(inode); - __unlock_super(sb); - pr_debug("%s exited 1\n", __func__); - return alias; - } - dput(alias); -out: - __unlock_super(sb); - dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode); - dentry = d_splice_alias(inode, dentry); - if (dentry) - dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode); - pr_debug("%s exited 2\n", __func__); - return dentry; - -error: - __unlock_super(sb); - pr_debug("%s exited 3\n", __func__); - return ERR_PTR(err); -} - -static inline unsigned long exfat_hash(loff_t i_pos) -{ - return hash_32(i_pos, EXFAT_HASH_BITS); -} - -static void exfat_attach(struct inode *inode, loff_t i_pos) -{ - struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); - struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); - - spin_lock(&sbi->inode_hash_lock); - EXFAT_I(inode)->i_pos = i_pos; - hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head); - spin_unlock(&sbi->inode_hash_lock); -} - -static void exfat_detach(struct inode *inode) -{ - struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); - - spin_lock(&sbi->inode_hash_lock); - hlist_del_init(&EXFAT_I(inode)->i_hash_fat); - EXFAT_I(inode)->i_pos = 0; - spin_unlock(&sbi->inode_hash_lock); -} - -static int exfat_unlink(struct inode *dir, struct dentry *dentry) -{ - struct inode *inode = dentry->d_inode; - struct super_block *sb = dir->i_sb; - struct timespec64 curtime; - int err; - - __lock_super(sb); - - pr_debug("%s entered\n", __func__); - - EXFAT_I(inode)->fid.size = i_size_read(inode); - - err = ffsRemoveFile(dir, &(EXFAT_I(inode)->fid)); - if (err) - goto out; - - INC_IVERSION(dir); - curtime = current_time(dir); - dir->i_mtime = curtime; - dir->i_atime = curtime; - if (IS_DIRSYNC(dir)) - (void)exfat_sync_inode(dir); - else - mark_inode_dirty(dir); - - clear_nlink(inode); - curtime = current_time(inode); - inode->i_mtime = curtime; - inode->i_atime = curtime; - exfat_detach(inode); - remove_inode_hash(inode); - -out: - __unlock_super(sb); - pr_debug("%s exited\n", __func__); - return err; -} - -static int exfat_symlink(struct inode *dir, struct dentry *dentry, - const char *target) -{ - struct super_block *sb = dir->i_sb; - struct timespec64 curtime; - struct inode *inode; - struct file_id_t fid; - loff_t i_pos; - int err; - u64 len = (u64)strlen(target); - u64 ret; - - __lock_super(sb); - - pr_debug("%s entered\n", __func__); - - err = ffsCreateFile(dir, (u8 *)dentry->d_name.name, FM_SYMLINK, &fid); - if (err) - goto out; - - - err = ffsWriteFile(dir, &fid, (char *)target, len, &ret); - - if (err) { - ffsRemoveFile(dir, &fid); - goto out; - } - - INC_IVERSION(dir); - curtime = current_time(dir); - dir->i_ctime = curtime; - dir->i_mtime = curtime; - dir->i_atime = curtime; - if (IS_DIRSYNC(dir)) - (void)exfat_sync_inode(dir); - else - mark_inode_dirty(dir); - - i_pos = ((loff_t)fid.dir.dir << 32) | (fid.entry & 0xffffffff); - - inode = exfat_build_inode(sb, &fid, i_pos); - if (IS_ERR(inode)) { - err = PTR_ERR(inode); - goto out; - } - INC_IVERSION(inode); - curtime = current_time(inode); - inode->i_mtime = curtime; - inode->i_atime = curtime; - inode->i_ctime = curtime; - /* timestamp is already written, so mark_inode_dirty() is unneeded. */ - - EXFAT_I(inode)->target = kmemdup(target, len + 1, GFP_KERNEL); - if (!EXFAT_I(inode)->target) { - err = -ENOMEM; - goto out; - } - - dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode); - d_instantiate(dentry, inode); - -out: - __unlock_super(sb); - pr_debug("%s exited\n", __func__); - return err; -} - -static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) -{ - struct super_block *sb = dir->i_sb; - struct timespec64 curtime; - struct inode *inode; - struct file_id_t fid; - loff_t i_pos; - int err; - - __lock_super(sb); - - pr_debug("%s entered\n", __func__); - - err = ffsCreateDir(dir, (u8 *)dentry->d_name.name, &fid); - if (err) - goto out; - - INC_IVERSION(dir); - curtime = current_time(dir); - dir->i_ctime = curtime; - dir->i_mtime = curtime; - dir->i_atime = curtime; - if (IS_DIRSYNC(dir)) - (void)exfat_sync_inode(dir); - else - mark_inode_dirty(dir); - inc_nlink(dir); - - i_pos = ((loff_t)fid.dir.dir << 32) | (fid.entry & 0xffffffff); - - inode = exfat_build_inode(sb, &fid, i_pos); - if (IS_ERR(inode)) { - err = PTR_ERR(inode); - goto out; - } - INC_IVERSION(inode); - curtime = current_time(inode); - inode->i_mtime = curtime; - inode->i_atime = curtime; - inode->i_ctime = curtime; - /* timestamp is already written, so mark_inode_dirty() is unneeded. */ - - dentry->d_time = GET_IVERSION(dentry->d_parent->d_inode); - d_instantiate(dentry, inode); - -out: - __unlock_super(sb); - pr_debug("%s exited\n", __func__); - return err; -} - -static int exfat_rmdir(struct inode *dir, struct dentry *dentry) -{ - struct inode *inode = dentry->d_inode; - struct super_block *sb = dir->i_sb; - struct timespec64 curtime; - int err; - - __lock_super(sb); - - pr_debug("%s entered\n", __func__); - - EXFAT_I(inode)->fid.size = i_size_read(inode); - - err = ffsRemoveDir(dir, &(EXFAT_I(inode)->fid)); - if (err) - goto out; - - INC_IVERSION(dir); - curtime = current_time(dir); - dir->i_mtime = curtime; - dir->i_atime = curtime; - if (IS_DIRSYNC(dir)) - (void)exfat_sync_inode(dir); - else - mark_inode_dirty(dir); - drop_nlink(dir); - - clear_nlink(inode); - curtime = current_time(inode); - inode->i_mtime = curtime; - inode->i_atime = curtime; - exfat_detach(inode); - remove_inode_hash(inode); - -out: - __unlock_super(sb); - pr_debug("%s exited\n", __func__); - return err; -} - -static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry, - struct inode *new_dir, struct dentry *new_dentry, - unsigned int flags) -{ - struct inode *old_inode, *new_inode; - struct super_block *sb = old_dir->i_sb; - struct timespec64 curtime; - loff_t i_pos; - int err; - - if (flags) - return -EINVAL; - - __lock_super(sb); - - pr_debug("%s entered\n", __func__); - - old_inode = old_dentry->d_inode; - new_inode = new_dentry->d_inode; - - EXFAT_I(old_inode)->fid.size = i_size_read(old_inode); - - err = ffsMoveFile(old_dir, &(EXFAT_I(old_inode)->fid), new_dir, - new_dentry); - if (err) - goto out; - - INC_IVERSION(new_dir); - curtime = current_time(new_dir); - new_dir->i_ctime = curtime; - new_dir->i_mtime = curtime; - new_dir->i_atime = curtime; - - if (IS_DIRSYNC(new_dir)) - (void)exfat_sync_inode(new_dir); - else - mark_inode_dirty(new_dir); - - i_pos = ((loff_t)EXFAT_I(old_inode)->fid.dir.dir << 32) | - (EXFAT_I(old_inode)->fid.entry & 0xffffffff); - - exfat_detach(old_inode); - exfat_attach(old_inode, i_pos); - if (IS_DIRSYNC(new_dir)) - (void)exfat_sync_inode(old_inode); - else - mark_inode_dirty(old_inode); - - if ((S_ISDIR(old_inode->i_mode)) && (old_dir != new_dir)) { - drop_nlink(old_dir); - if (!new_inode) - inc_nlink(new_dir); - } - INC_IVERSION(old_dir); - curtime = current_time(old_dir); - old_dir->i_ctime = curtime; - old_dir->i_mtime = curtime; - if (IS_DIRSYNC(old_dir)) - (void)exfat_sync_inode(old_dir); - else - mark_inode_dirty(old_dir); - - if (new_inode) { - exfat_detach(new_inode); - drop_nlink(new_inode); - if (S_ISDIR(new_inode->i_mode)) - drop_nlink(new_inode); - new_inode->i_ctime = current_time(new_inode); - } - -out: - __unlock_super(sb); - pr_debug("%s exited\n", __func__); - return err; -} - -static int exfat_cont_expand(struct inode *inode, loff_t size) -{ - struct address_space *mapping = inode->i_mapping; - loff_t start = i_size_read(inode), count = size - i_size_read(inode); - struct timespec64 curtime; - int err, err2; - - err = generic_cont_expand_simple(inode, size); - if (err != 0) - return err; - - curtime = current_time(inode); - inode->i_ctime = curtime; - inode->i_mtime = curtime; - mark_inode_dirty(inode); - - if (IS_SYNC(inode)) { - err = filemap_fdatawrite_range(mapping, start, - start + count - 1); - err2 = sync_mapping_buffers(mapping); - err = (err) ? (err) : (err2); - err2 = write_inode_now(inode, 1); - err = (err) ? (err) : (err2); - if (!err) - err = filemap_fdatawait_range(mapping, start, - start + count - 1); - } - return err; -} - -static int exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode) -{ - mode_t allow_utime = sbi->options.allow_utime; - - if (!uid_eq(current_fsuid(), inode->i_uid)) { - if (in_group_p(inode->i_gid)) - allow_utime >>= 3; - if (allow_utime & MAY_WRITE) - return 1; - } - - /* use a default check */ - return 0; -} - -static int exfat_sanitize_mode(const struct exfat_sb_info *sbi, - struct inode *inode, umode_t *mode_ptr) -{ - mode_t i_mode, mask, perm; - - i_mode = inode->i_mode; - - if (S_ISREG(i_mode) || S_ISLNK(i_mode)) - mask = sbi->options.fs_fmask; - else - mask = sbi->options.fs_dmask; - - perm = *mode_ptr & ~(S_IFMT | mask); - - /* Of the r and x bits, all (subject to umask) must be present.*/ - if ((perm & 0555) != (i_mode & 0555)) - return -EPERM; - - if (exfat_mode_can_hold_ro(inode)) { - /* - * Of the w bits, either all (subject to umask) or none must be - * present. - */ - if ((perm & 0222) && ((perm & 0222) != (0222 & ~mask))) - return -EPERM; - } else { - /* - * If exfat_mode_can_hold_ro(inode) is false, can't change w - * bits. - */ - if ((perm & 0222) != (0222 & ~mask)) - return -EPERM; - } - - *mode_ptr &= S_IFMT | perm; - - return 0; -} - -static void exfat_truncate(struct inode *inode, loff_t old_size) -{ - struct super_block *sb = inode->i_sb; - struct exfat_sb_info *sbi = EXFAT_SB(sb); - struct fs_info_t *p_fs = &sbi->fs_info; - struct timespec64 curtime; - int err; - - __lock_super(sb); - - /* - * This protects against truncating a file bigger than it was then - * trying to write into the hole. - */ - if (EXFAT_I(inode)->mmu_private > i_size_read(inode)) - EXFAT_I(inode)->mmu_private = i_size_read(inode); - - if (EXFAT_I(inode)->fid.start_clu == 0) - goto out; - - err = ffsTruncateFile(inode, old_size, i_size_read(inode)); - if (err) - goto out; - - curtime = current_time(inode); - inode->i_ctime = curtime; - inode->i_mtime = curtime; - if (IS_DIRSYNC(inode)) - (void)exfat_sync_inode(inode); - else - mark_inode_dirty(inode); - - inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) & - ~((loff_t)p_fs->cluster_size - 1)) >> 9; -out: - __unlock_super(sb); -} - -static int exfat_setattr(struct dentry *dentry, struct iattr *attr) -{ - struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb); - struct inode *inode = dentry->d_inode; - unsigned int ia_valid; - int error; - loff_t old_size; - - pr_debug("%s entered\n", __func__); - - if ((attr->ia_valid & ATTR_SIZE) && - attr->ia_size > i_size_read(inode)) { - error = exfat_cont_expand(inode, attr->ia_size); - if (error || attr->ia_valid == ATTR_SIZE) - return error; - attr->ia_valid &= ~ATTR_SIZE; - } - - ia_valid = attr->ia_valid; - - if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) && - exfat_allow_set_time(sbi, inode)) { - attr->ia_valid &= ~(ATTR_MTIME_SET | - ATTR_ATIME_SET | - ATTR_TIMES_SET); - } - - error = setattr_prepare(dentry, attr); - attr->ia_valid = ia_valid; - if (error) - return error; - - if (((attr->ia_valid & ATTR_UID) && - (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) || - ((attr->ia_valid & ATTR_GID) && - (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) || - ((attr->ia_valid & ATTR_MODE) && - (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | 0777)))) { - return -EPERM; - } - - /* - * We don't return -EPERM here. Yes, strange, but this is too - * old behavior. - */ - if (attr->ia_valid & ATTR_MODE) { - if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0) - attr->ia_valid &= ~ATTR_MODE; - } - - EXFAT_I(inode)->fid.size = i_size_read(inode); - - if (attr->ia_valid & ATTR_SIZE) { - old_size = i_size_read(inode); - down_write(&EXFAT_I(inode)->truncate_lock); - truncate_setsize(inode, attr->ia_size); - exfat_truncate(inode, old_size); - up_write(&EXFAT_I(inode)->truncate_lock); - } - setattr_copy(inode, attr); - mark_inode_dirty(inode); - - pr_debug("%s exited\n", __func__); - return error; -} - -static int exfat_getattr(const struct path *path, struct kstat *stat, - u32 request_mask, unsigned int flags) -{ - struct inode *inode = path->dentry->d_inode; - - pr_debug("%s entered\n", __func__); - - generic_fillattr(inode, stat); - stat->blksize = EXFAT_SB(inode->i_sb)->fs_info.cluster_size; - - pr_debug("%s exited\n", __func__); - return 0; -} - -static const struct inode_operations exfat_dir_inode_operations = { - .create = exfat_create, - .lookup = exfat_lookup, - .unlink = exfat_unlink, - .symlink = exfat_symlink, - .mkdir = exfat_mkdir, - .rmdir = exfat_rmdir, - .rename = exfat_rename, - .setattr = exfat_setattr, - .getattr = exfat_getattr, -}; - -/*======================================================================*/ -/* File Operations */ -/*======================================================================*/ -static const char *exfat_get_link(struct dentry *dentry, struct inode *inode, - struct delayed_call *done) -{ - struct exfat_inode_info *ei = EXFAT_I(inode); - - if (ei->target) { - char *cookie = ei->target; - - if (cookie) - return (char *)(ei->target); - } - return NULL; -} - -static const struct inode_operations exfat_symlink_inode_operations = { - .get_link = exfat_get_link, -}; - -static int exfat_file_release(struct inode *inode, struct file *filp) -{ - struct super_block *sb = inode->i_sb; - - EXFAT_I(inode)->fid.size = i_size_read(inode); - ffsSyncVol(sb, false); - return 0; -} - -static const struct file_operations exfat_file_operations = { - .llseek = generic_file_llseek, - .read_iter = generic_file_read_iter, - .write_iter = generic_file_write_iter, - .mmap = generic_file_mmap, - .release = exfat_file_release, - .unlocked_ioctl = exfat_generic_ioctl, - .fsync = generic_file_fsync, - .splice_read = generic_file_splice_read, -}; - -static const struct inode_operations exfat_file_inode_operations = { - .setattr = exfat_setattr, - .getattr = exfat_getattr, -}; - -/*======================================================================*/ -/* Address Space Operations */ -/*======================================================================*/ - -static int exfat_bmap(struct inode *inode, sector_t sector, sector_t *phys, - unsigned long *mapped_blocks, int *create) -{ - struct super_block *sb = inode->i_sb; - struct exfat_sb_info *sbi = EXFAT_SB(sb); - struct fs_info_t *p_fs = &sbi->fs_info; - const unsigned long blocksize = sb->s_blocksize; - const unsigned char blocksize_bits = sb->s_blocksize_bits; - sector_t last_block; - int err, clu_offset, sec_offset; - unsigned int cluster; - - *phys = 0; - *mapped_blocks = 0; - - last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits; - if (sector >= last_block) { - if (*create == 0) - return 0; - } else { - *create = 0; - } - - /* cluster offset */ - clu_offset = sector >> p_fs->sectors_per_clu_bits; - - /* sector offset in cluster */ - sec_offset = sector & (p_fs->sectors_per_clu - 1); - - EXFAT_I(inode)->fid.size = i_size_read(inode); - - err = ffsMapCluster(inode, clu_offset, &cluster); - - if (!err && (cluster != CLUSTER_32(~0))) { - *phys = START_SECTOR(cluster) + sec_offset; - *mapped_blocks = p_fs->sectors_per_clu - sec_offset; - } - - return 0; -} - -static int exfat_get_block(struct inode *inode, sector_t iblock, - struct buffer_head *bh_result, int create) -{ - struct super_block *sb = inode->i_sb; - unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; - int err; - unsigned long mapped_blocks; - sector_t phys; - - __lock_super(sb); - - err = exfat_bmap(inode, iblock, &phys, &mapped_blocks, &create); - if (err) { - __unlock_super(sb); - return err; - } - - if (phys) { - max_blocks = min(mapped_blocks, max_blocks); - if (create) { - EXFAT_I(inode)->mmu_private += max_blocks << - sb->s_blocksize_bits; - set_buffer_new(bh_result); - } - map_bh(bh_result, sb, phys); - } - - bh_result->b_size = max_blocks << sb->s_blocksize_bits; - __unlock_super(sb); - - return 0; -} - -static int exfat_readpage(struct file *file, struct page *page) -{ - return mpage_readpage(page, exfat_get_block); -} - -static int exfat_readpages(struct file *file, struct address_space *mapping, - struct list_head *pages, unsigned int nr_pages) -{ - return mpage_readpages(mapping, pages, nr_pages, exfat_get_block); -} - -static int exfat_writepage(struct page *page, struct writeback_control *wbc) -{ - return block_write_full_page(page, exfat_get_block, wbc); -} - -static int exfat_writepages(struct address_space *mapping, - struct writeback_control *wbc) -{ - return mpage_writepages(mapping, wbc, exfat_get_block); -} - -static void exfat_write_failed(struct address_space *mapping, loff_t to) -{ - struct inode *inode = mapping->host; - - if (to > i_size_read(inode)) { - truncate_pagecache(inode, i_size_read(inode)); - EXFAT_I(inode)->fid.size = i_size_read(inode); - exfat_truncate(inode, i_size_read(inode)); - } -} - -static int exfat_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned int len, unsigned int flags, - struct page **pagep, void **fsdata) -{ - int ret; - - *pagep = NULL; - ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, - exfat_get_block, - &EXFAT_I(mapping->host)->mmu_private); - - if (ret < 0) - exfat_write_failed(mapping, pos + len); - return ret; -} - -static int exfat_write_end(struct file *file, struct address_space *mapping, - loff_t pos, unsigned int len, unsigned int copied, - struct page *pagep, void *fsdata) -{ - struct inode *inode = mapping->host; - struct file_id_t *fid = &(EXFAT_I(inode)->fid); - struct timespec64 curtime; - int err; - - err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); - - if (err < len) - exfat_write_failed(mapping, pos + len); - - if (!(err < 0) && !(fid->attr & ATTR_ARCHIVE)) { - curtime = current_time(inode); - inode->i_mtime = curtime; - inode->i_ctime = curtime; - fid->attr |= ATTR_ARCHIVE; - mark_inode_dirty(inode); - } - return err; -} - -static ssize_t exfat_direct_IO(struct kiocb *iocb, struct iov_iter *iter) -{ - struct inode *inode = iocb->ki_filp->f_mapping->host; - struct address_space *mapping = iocb->ki_filp->f_mapping; - ssize_t ret; - int rw; - - rw = iov_iter_rw(iter); - - if (rw == WRITE) { - if (EXFAT_I(inode)->mmu_private < iov_iter_count(iter)) - return 0; - } - ret = blockdev_direct_IO(iocb, inode, iter, exfat_get_block); - - if ((ret < 0) && (rw & WRITE)) - exfat_write_failed(mapping, iov_iter_count(iter)); - return ret; -} - -static sector_t _exfat_bmap(struct address_space *mapping, sector_t block) -{ - sector_t blocknr; - - /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */ - down_read(&EXFAT_I(mapping->host)->truncate_lock); - blocknr = generic_block_bmap(mapping, block, exfat_get_block); - up_read(&EXFAT_I(mapping->host)->truncate_lock); - - return blocknr; -} - -static const struct address_space_operations exfat_aops = { - .readpage = exfat_readpage, - .readpages = exfat_readpages, - .writepage = exfat_writepage, - .writepages = exfat_writepages, - .write_begin = exfat_write_begin, - .write_end = exfat_write_end, - .direct_IO = exfat_direct_IO, - .bmap = _exfat_bmap -}; - -/*======================================================================*/ -/* Super Operations */ -/*======================================================================*/ - -static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos) -{ - struct exfat_sb_info *sbi = EXFAT_SB(sb); - struct exfat_inode_info *info; - struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); - struct inode *inode = NULL; - - spin_lock(&sbi->inode_hash_lock); - hlist_for_each_entry(info, head, i_hash_fat) { - BUG_ON(info->vfs_inode.i_sb != sb); - - if (i_pos != info->i_pos) - continue; - inode = igrab(&info->vfs_inode); - if (inode) - break; - } - spin_unlock(&sbi->inode_hash_lock); - return inode; -} - -/* doesn't deal with root inode */ -static int exfat_fill_inode(struct inode *inode, struct file_id_t *fid) -{ - struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); - struct fs_info_t *p_fs = &sbi->fs_info; - struct dir_entry_t info; - - memcpy(&(EXFAT_I(inode)->fid), fid, sizeof(struct file_id_t)); - - ffsReadStat(inode, &info); - - EXFAT_I(inode)->i_pos = 0; - EXFAT_I(inode)->target = NULL; - inode->i_uid = sbi->options.fs_uid; - inode->i_gid = sbi->options.fs_gid; - INC_IVERSION(inode); - inode->i_generation = prandom_u32(); - - if (info.Attr & ATTR_SUBDIR) { /* directory */ - inode->i_generation &= ~1; - inode->i_mode = exfat_make_mode(sbi, info.Attr, 0777); - inode->i_op = &exfat_dir_inode_operations; - inode->i_fop = &exfat_dir_operations; - - i_size_write(inode, info.Size); - EXFAT_I(inode)->mmu_private = i_size_read(inode); - set_nlink(inode, info.NumSubdirs); - } else if (info.Attr & ATTR_SYMLINK) { /* symbolic link */ - inode->i_generation |= 1; - inode->i_mode = exfat_make_mode(sbi, info.Attr, 0777); - inode->i_op = &exfat_symlink_inode_operations; - - i_size_write(inode, info.Size); - EXFAT_I(inode)->mmu_private = i_size_read(inode); - } else { /* regular file */ - inode->i_generation |= 1; - inode->i_mode = exfat_make_mode(sbi, info.Attr, 0777); - inode->i_op = &exfat_file_inode_operations; - inode->i_fop = &exfat_file_operations; - inode->i_mapping->a_ops = &exfat_aops; - inode->i_mapping->nrpages = 0; - - i_size_write(inode, info.Size); - EXFAT_I(inode)->mmu_private = i_size_read(inode); - } - exfat_save_attr(inode, info.Attr); - - inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) - & ~((loff_t)p_fs->cluster_size - 1)) >> 9; - - exfat_time_fat2unix(&inode->i_mtime, &info.ModifyTimestamp); - exfat_time_fat2unix(&inode->i_ctime, &info.CreateTimestamp); - exfat_time_fat2unix(&inode->i_atime, &info.AccessTimestamp); - - return 0; -} - -static struct inode *exfat_build_inode(struct super_block *sb, - struct file_id_t *fid, loff_t i_pos) -{ - struct inode *inode; - int err; - - inode = exfat_iget(sb, i_pos); - if (inode) - goto out; - inode = new_inode(sb); - if (!inode) { - inode = ERR_PTR(-ENOMEM); - goto out; - } - inode->i_ino = iunique(sb, EXFAT_ROOT_INO); - SET_IVERSION(inode, 1); - err = exfat_fill_inode(inode, fid); - if (err) { - iput(inode); - inode = ERR_PTR(err); - goto out; - } - exfat_attach(inode, i_pos); - insert_inode_hash(inode); -out: - return inode; -} - -static int exfat_sync_inode(struct inode *inode) -{ - return exfat_write_inode(inode, NULL); -} - -static struct inode *exfat_alloc_inode(struct super_block *sb) -{ - struct exfat_inode_info *ei; - - ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS); - if (!ei) - return NULL; - - init_rwsem(&ei->truncate_lock); - - return &ei->vfs_inode; -} - -static void exfat_destroy_inode(struct inode *inode) -{ - kfree(EXFAT_I(inode)->target); - EXFAT_I(inode)->target = NULL; - - kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); -} - -static int exfat_write_inode(struct inode *inode, struct writeback_control *wbc) -{ - struct dir_entry_t info; - - if (inode->i_ino == EXFAT_ROOT_INO) - return 0; - - info.Attr = exfat_make_attr(inode); - info.Size = i_size_read(inode); - - exfat_time_unix2fat(&inode->i_mtime, &info.ModifyTimestamp); - exfat_time_unix2fat(&inode->i_ctime, &info.CreateTimestamp); - exfat_time_unix2fat(&inode->i_atime, &info.AccessTimestamp); - - ffsWriteStat(inode, &info); - - return 0; -} - -static void exfat_evict_inode(struct inode *inode) -{ - truncate_inode_pages(&inode->i_data, 0); - - if (!inode->i_nlink) - i_size_write(inode, 0); - invalidate_inode_buffers(inode); - clear_inode(inode); - exfat_detach(inode); - - remove_inode_hash(inode); -} - -static void exfat_free_super(struct exfat_sb_info *sbi) -{ - if (sbi->nls_disk) - unload_nls(sbi->nls_disk); - if (sbi->nls_io) - unload_nls(sbi->nls_io); - if (sbi->options.iocharset != exfat_default_iocharset) - kfree(sbi->options.iocharset); - /* mutex_init is in exfat_fill_super function. only for 3.7+ */ - mutex_destroy(&sbi->s_lock); - kvfree(sbi); -} - -static void exfat_put_super(struct super_block *sb) -{ - struct exfat_sb_info *sbi = EXFAT_SB(sb); - - if (__is_sb_dirty(sb)) - exfat_write_super(sb); - - ffsUmountVol(sb); - - sb->s_fs_info = NULL; - exfat_free_super(sbi); -} - -static void exfat_write_super(struct super_block *sb) -{ - __lock_super(sb); - - __set_sb_clean(sb); - - if (!sb_rdonly(sb)) - ffsSyncVol(sb, true); - - __unlock_super(sb); -} - -static int exfat_sync_fs(struct super_block *sb, int wait) -{ - int err = 0; - - if (__is_sb_dirty(sb)) { - __lock_super(sb); - __set_sb_clean(sb); - err = ffsSyncVol(sb, true); - __unlock_super(sb); - } - - return err; -} - -static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) -{ - struct super_block *sb = dentry->d_sb; - u64 id = huge_encode_dev(sb->s_bdev->bd_dev); - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - struct vol_info_t info; - - if (p_fs->used_clusters == UINT_MAX) { - if (ffsGetVolInfo(sb, &info) == -EIO) - return -EIO; - - } else { - info.FatType = p_fs->vol_type; - info.ClusterSize = p_fs->cluster_size; - info.NumClusters = p_fs->num_clusters - 2; - info.UsedClusters = p_fs->used_clusters; - info.FreeClusters = info.NumClusters - info.UsedClusters; - - if (p_fs->dev_ejected) - pr_info("[EXFAT] statfs on device that is ejected\n"); - } - - buf->f_type = sb->s_magic; - buf->f_bsize = info.ClusterSize; - buf->f_blocks = info.NumClusters; - buf->f_bfree = info.FreeClusters; - buf->f_bavail = info.FreeClusters; - buf->f_fsid.val[0] = (u32)id; - buf->f_fsid.val[1] = (u32)(id >> 32); - buf->f_namelen = 260; - - return 0; -} - -static int exfat_remount(struct super_block *sb, int *flags, char *data) -{ - *flags |= SB_NODIRATIME; - return 0; -} - -static int exfat_show_options(struct seq_file *m, struct dentry *root) -{ - struct exfat_sb_info *sbi = EXFAT_SB(root->d_sb); - struct exfat_mount_options *opts = &sbi->options; - - if (__kuid_val(opts->fs_uid)) - seq_printf(m, ",uid=%u", __kuid_val(opts->fs_uid)); - if (__kgid_val(opts->fs_gid)) - seq_printf(m, ",gid=%u", __kgid_val(opts->fs_gid)); - seq_printf(m, ",fmask=%04o", opts->fs_fmask); - seq_printf(m, ",dmask=%04o", opts->fs_dmask); - if (opts->allow_utime) - seq_printf(m, ",allow_utime=%04o", opts->allow_utime); - if (sbi->nls_disk) - seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); - if (sbi->nls_io) - seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); - seq_printf(m, ",namecase=%u", opts->casesensitive); - if (opts->errors == EXFAT_ERRORS_CONT) - seq_puts(m, ",errors=continue"); - else if (opts->errors == EXFAT_ERRORS_PANIC) - seq_puts(m, ",errors=panic"); - else - seq_puts(m, ",errors=remount-ro"); -#ifdef CONFIG_STAGING_EXFAT_DISCARD - if (opts->discard) - seq_puts(m, ",discard"); -#endif - return 0; -} - -static const struct super_operations exfat_sops = { - .alloc_inode = exfat_alloc_inode, - .destroy_inode = exfat_destroy_inode, - .write_inode = exfat_write_inode, - .evict_inode = exfat_evict_inode, - .put_super = exfat_put_super, - .sync_fs = exfat_sync_fs, - .statfs = exfat_statfs, - .remount_fs = exfat_remount, - .show_options = exfat_show_options, -}; - -/*======================================================================*/ -/* Export Operations */ -/*======================================================================*/ - -static struct inode *exfat_nfs_get_inode(struct super_block *sb, u64 ino, - u32 generation) -{ - struct inode *inode = NULL; - - if (ino < EXFAT_ROOT_INO) - return inode; - inode = ilookup(sb, ino); - - if (inode && generation && (inode->i_generation != generation)) { - iput(inode); - inode = NULL; - } - - return inode; -} - -static struct dentry *exfat_fh_to_dentry(struct super_block *sb, - struct fid *fid, int fh_len, - int fh_type) -{ - return generic_fh_to_dentry(sb, fid, fh_len, fh_type, - exfat_nfs_get_inode); -} - -static struct dentry *exfat_fh_to_parent(struct super_block *sb, - struct fid *fid, int fh_len, - int fh_type) -{ - return generic_fh_to_parent(sb, fid, fh_len, fh_type, - exfat_nfs_get_inode); -} - -static const struct export_operations exfat_export_ops = { - .fh_to_dentry = exfat_fh_to_dentry, - .fh_to_parent = exfat_fh_to_parent, -}; - -/*======================================================================*/ -/* Super Block Read Operations */ -/*======================================================================*/ - -enum { - Opt_uid, - Opt_gid, - Opt_umask, - Opt_dmask, - Opt_fmask, - Opt_allow_utime, - Opt_codepage, - Opt_charset, - Opt_namecase, - Opt_debug, - Opt_err_cont, - Opt_err_panic, - Opt_err_ro, - Opt_utf8_hack, - Opt_err, -#ifdef CONFIG_STAGING_EXFAT_DISCARD - Opt_discard, -#endif /* EXFAT_CONFIG_DISCARD */ -}; - -static const match_table_t exfat_tokens = { - {Opt_uid, "uid=%u"}, - {Opt_gid, "gid=%u"}, - {Opt_umask, "umask=%o"}, - {Opt_dmask, "dmask=%o"}, - {Opt_fmask, "fmask=%o"}, - {Opt_allow_utime, "allow_utime=%o"}, - {Opt_codepage, "codepage=%u"}, - {Opt_charset, "iocharset=%s"}, - {Opt_namecase, "namecase=%u"}, - {Opt_debug, "debug"}, - {Opt_err_cont, "errors=continue"}, - {Opt_err_panic, "errors=panic"}, - {Opt_err_ro, "errors=remount-ro"}, - {Opt_utf8_hack, "utf8"}, -#ifdef CONFIG_STAGING_EXFAT_DISCARD - {Opt_discard, "discard"}, -#endif /* CONFIG_STAGING_EXFAT_DISCARD */ - {Opt_err, NULL} -}; - -static int parse_options(char *options, int silent, int *debug, - struct exfat_mount_options *opts) -{ - char *p; - substring_t args[MAX_OPT_ARGS]; - int option; - char *iocharset; - - opts->fs_uid = current_uid(); - opts->fs_gid = current_gid(); - opts->fs_fmask = current->fs->umask; - opts->fs_dmask = current->fs->umask; - opts->allow_utime = U16_MAX; - opts->codepage = exfat_default_codepage; - opts->iocharset = exfat_default_iocharset; - opts->casesensitive = 0; - opts->errors = EXFAT_ERRORS_RO; -#ifdef CONFIG_STAGING_EXFAT_DISCARD - opts->discard = 0; -#endif - *debug = 0; - - if (!options) - goto out; - - while ((p = strsep(&options, ","))) { - int token; - - if (!*p) - continue; - - token = match_token(p, exfat_tokens, args); - switch (token) { - case Opt_uid: - if (match_int(&args[0], &option)) - return 0; - opts->fs_uid = KUIDT_INIT(option); - break; - case Opt_gid: - if (match_int(&args[0], &option)) - return 0; - opts->fs_gid = KGIDT_INIT(option); - break; - case Opt_umask: - case Opt_dmask: - case Opt_fmask: - if (match_octal(&args[0], &option)) - return 0; - if (token != Opt_dmask) - opts->fs_fmask = option; - if (token != Opt_fmask) - opts->fs_dmask = option; - break; - case Opt_allow_utime: - if (match_octal(&args[0], &option)) - return 0; - opts->allow_utime = option & 0022; - break; - case Opt_codepage: - if (match_int(&args[0], &option)) - return 0; - opts->codepage = option; - break; - case Opt_charset: - if (opts->iocharset != exfat_default_iocharset) - kfree(opts->iocharset); - iocharset = match_strdup(&args[0]); - if (!iocharset) - return -ENOMEM; - opts->iocharset = iocharset; - break; - case Opt_namecase: - if (match_int(&args[0], &option)) - return 0; - opts->casesensitive = option; - break; - case Opt_err_cont: - opts->errors = EXFAT_ERRORS_CONT; - break; - case Opt_err_panic: - opts->errors = EXFAT_ERRORS_PANIC; - break; - case Opt_err_ro: - opts->errors = EXFAT_ERRORS_RO; - break; - case Opt_debug: - *debug = 1; - break; -#ifdef CONFIG_STAGING_EXFAT_DISCARD - case Opt_discard: - opts->discard = 1; - break; -#endif /* CONFIG_STAGING_EXFAT_DISCARD */ - case Opt_utf8_hack: - break; - default: - if (!silent) - pr_err("[EXFAT] Unrecognized mount option %s or missing value\n", - p); - return -EINVAL; - } - } - -out: - if (opts->allow_utime == U16_MAX) - opts->allow_utime = ~opts->fs_dmask & 0022; - - return 0; -} - -static void exfat_hash_init(struct super_block *sb) -{ - struct exfat_sb_info *sbi = EXFAT_SB(sb); - int i; - - spin_lock_init(&sbi->inode_hash_lock); - for (i = 0; i < EXFAT_HASH_SIZE; i++) - INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); -} - -static int exfat_read_root(struct inode *inode) -{ - struct super_block *sb = inode->i_sb; - struct exfat_sb_info *sbi = EXFAT_SB(sb); - struct fs_info_t *p_fs = &sbi->fs_info; - struct timespec64 curtime; - struct dir_entry_t info; - - EXFAT_I(inode)->fid.dir.dir = p_fs->root_dir; - EXFAT_I(inode)->fid.dir.flags = 0x01; - EXFAT_I(inode)->fid.entry = -1; - EXFAT_I(inode)->fid.start_clu = p_fs->root_dir; - EXFAT_I(inode)->fid.flags = 0x01; - EXFAT_I(inode)->fid.type = TYPE_DIR; - EXFAT_I(inode)->fid.rwoffset = 0; - EXFAT_I(inode)->fid.hint_last_off = -1; - - EXFAT_I(inode)->target = NULL; - - ffsReadStat(inode, &info); - - inode->i_uid = sbi->options.fs_uid; - inode->i_gid = sbi->options.fs_gid; - INC_IVERSION(inode); - inode->i_generation = 0; - inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, 0777); - inode->i_op = &exfat_dir_inode_operations; - inode->i_fop = &exfat_dir_operations; - - i_size_write(inode, info.Size); - inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) - & ~((loff_t)p_fs->cluster_size - 1)) >> 9; - EXFAT_I(inode)->i_pos = ((loff_t)p_fs->root_dir << 32) | 0xffffffff; - EXFAT_I(inode)->mmu_private = i_size_read(inode); - - exfat_save_attr(inode, ATTR_SUBDIR); - curtime = current_time(inode); - inode->i_mtime = curtime; - inode->i_atime = curtime; - inode->i_ctime = curtime; - set_nlink(inode, info.NumSubdirs + 2); - - return 0; -} - -static void setup_dops(struct super_block *sb) -{ - if (EXFAT_SB(sb)->options.casesensitive == 0) - sb->s_d_op = &exfat_ci_dentry_ops; - else - sb->s_d_op = &exfat_dentry_ops; -} - -static int exfat_fill_super(struct super_block *sb, void *data, int silent) -{ - struct inode *root_inode = NULL; - struct exfat_sb_info *sbi; - int debug, ret; - long error; - - /* - * GFP_KERNEL is ok here, because while we do hold the - * supeblock lock, memory pressure can't call back into - * the filesystem, since we're only just about to mount - * it and have no inodes etc active! - */ - sbi = kvzalloc(sizeof(*sbi), GFP_KERNEL); - if (!sbi) - return -ENOMEM; - mutex_init(&sbi->s_lock); - sb->s_fs_info = sbi; - sb->s_flags |= SB_NODIRATIME; - sb->s_magic = EXFAT_SUPER_MAGIC; - sb->s_op = &exfat_sops; - sb->s_export_op = &exfat_export_ops; - - error = parse_options(data, silent, &debug, &sbi->options); - if (error) - goto out_fail; - - setup_dops(sb); - - error = -EIO; - sb_min_blocksize(sb, 512); - sb->s_maxbytes = 0x7fffffffffffffffLL; /* maximum file size */ - - ret = ffsMountVol(sb); - if (ret) { - if (!silent) - pr_err("[EXFAT] ffsMountVol failed\n"); - - goto out_fail; - } - - /* set up enough so that it can read an inode */ - exfat_hash_init(sb); - - /* - * The low byte of FAT's first entry must have same value with - * media-field. But in real world, too many devices is - * writing wrong value. So, removed that validity check. - * - * if (FAT_FIRST_ENT(sb, media) != first) - */ - - sbi->nls_io = load_nls(sbi->options.iocharset); - - error = -ENOMEM; - root_inode = new_inode(sb); - if (!root_inode) - goto out_fail2; - root_inode->i_ino = EXFAT_ROOT_INO; - SET_IVERSION(root_inode, 1); - - error = exfat_read_root(root_inode); - if (error < 0) - goto out_fail2; - error = -ENOMEM; - exfat_attach(root_inode, EXFAT_I(root_inode)->i_pos); - insert_inode_hash(root_inode); - sb->s_root = d_make_root(root_inode); - if (!sb->s_root) { - pr_err("[EXFAT] Getting the root inode failed\n"); - goto out_fail2; - } - - return 0; - -out_fail2: - ffsUmountVol(sb); -out_fail: - if (root_inode) - iput(root_inode); - sb->s_fs_info = NULL; - exfat_free_super(sbi); - return error; -} - -static struct dentry *exfat_fs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, - void *data) -{ - return mount_bdev(fs_type, flags, dev_name, data, exfat_fill_super); -} - -static void init_once(void *foo) -{ - struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; - - INIT_HLIST_NODE(&ei->i_hash_fat); - inode_init_once(&ei->vfs_inode); -} - -static int __init exfat_init_inodecache(void) -{ - exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", - sizeof(struct exfat_inode_info), - 0, - (SLAB_RECLAIM_ACCOUNT | - SLAB_MEM_SPREAD), - init_once); - if (!exfat_inode_cachep) - return -ENOMEM; - return 0; -} - -static void __exit exfat_destroy_inodecache(void) -{ - /* - * Make sure all delayed rcu free inodes are flushed before we - * destroy cache. - */ - rcu_barrier(); - kmem_cache_destroy(exfat_inode_cachep); -} - -#ifdef CONFIG_STAGING_EXFAT_KERNEL_DEBUG -static void exfat_debug_kill_sb(struct super_block *sb) -{ - struct exfat_sb_info *sbi = EXFAT_SB(sb); - struct block_device *bdev = sb->s_bdev; - struct fs_info_t *p_fs = &(EXFAT_SB(sb)->fs_info); - - long flags; - - if (sbi) { - flags = sbi->debug_flags; - - if (flags & EXFAT_DEBUGFLAGS_INVALID_UMOUNT) { - /* - * invalidate_bdev drops all device cache include - * dirty. We use this to simulate device removal. - */ - mutex_lock(&p_fs->v_mutex); - exfat_fat_release_all(sb); - exfat_buf_release_all(sb); - mutex_unlock(&p_fs->v_mutex); - - invalidate_bdev(bdev); - } - } - - kill_block_super(sb); -} -#endif /* CONFIG_STAGING_EXFAT_KERNEL_DEBUG */ - -static struct file_system_type exfat_fs_type = { - .owner = THIS_MODULE, - .name = "exfat", - .mount = exfat_fs_mount, -#ifdef CONFIG_STAGING_EXFAT_KERNEL_DEBUG - .kill_sb = exfat_debug_kill_sb, -#else - .kill_sb = kill_block_super, -#endif /* CONFIG_STAGING_EXFAT_KERNEL_DEBUG */ - .fs_flags = FS_REQUIRES_DEV, -}; - -static int __init init_exfat(void) -{ - int err; - - BUILD_BUG_ON(sizeof(struct dentry_t) != DENTRY_SIZE); - BUILD_BUG_ON(sizeof(struct dos_dentry_t) != DENTRY_SIZE); - BUILD_BUG_ON(sizeof(struct ext_dentry_t) != DENTRY_SIZE); - BUILD_BUG_ON(sizeof(struct file_dentry_t) != DENTRY_SIZE); - BUILD_BUG_ON(sizeof(struct strm_dentry_t) != DENTRY_SIZE); - BUILD_BUG_ON(sizeof(struct name_dentry_t) != DENTRY_SIZE); - BUILD_BUG_ON(sizeof(struct bmap_dentry_t) != DENTRY_SIZE); - BUILD_BUG_ON(sizeof(struct case_dentry_t) != DENTRY_SIZE); - BUILD_BUG_ON(sizeof(struct volm_dentry_t) != DENTRY_SIZE); - - pr_info("exFAT: Version %s\n", EXFAT_VERSION); - - err = exfat_init_inodecache(); - if (err) - return err; - - err = register_filesystem(&exfat_fs_type); - if (err) - return err; - - return 0; -} - -static void __exit exit_exfat(void) -{ - exfat_destroy_inodecache(); - unregister_filesystem(&exfat_fs_type); -} - -module_init(init_exfat); -module_exit(exit_exfat); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("exFAT Filesystem Driver"); -MODULE_ALIAS_FS("exfat"); |