From: Chao Yu Date: Mon, 9 May 2016 11:56:32 +0000 (+0800) Subject: f2fs: use mnt_{want,drop}_write_file in ioctl X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7fb17fe44b70c854d380686d8b7e63217f9f1dcf;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git f2fs: use mnt_{want,drop}_write_file in ioctl In interfaces of ioctl, mnt_{want,drop}_write_file should be used for: - get exclusion against file system freezing which may used by lvm snapshot. - do telling filesystem that a write is about to be performed on it, and make sure that the writes are permitted. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 314612997721..2f8f225ddbc5 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1307,20 +1307,16 @@ static int f2fs_ioc_setflags(struct file *filp, unsigned long arg) unsigned int oldflags; int ret; + if (!inode_owner_or_capable(inode)) + return -EACCES; + + if (get_user(flags, (int __user *)arg)) + return -EFAULT; + ret = mnt_want_write_file(filp); if (ret) return ret; - if (!inode_owner_or_capable(inode)) { - ret = -EACCES; - goto out; - } - - if (get_user(flags, (int __user *)arg)) { - ret = -EFAULT; - goto out; - } - flags = f2fs_mask_flags(inode->i_mode, flags); inode_lock(inode); @@ -1363,18 +1359,22 @@ static int f2fs_ioc_start_atomic_write(struct file *filp) if (!inode_owner_or_capable(inode)) return -EACCES; + ret = mnt_want_write_file(filp); + if (ret) + return ret; + if (f2fs_is_atomic_file(inode)) - return 0; + goto out; ret = f2fs_convert_inline_inode(inode); if (ret) - return ret; + goto out; set_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE); f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); if (!get_dirty_pages(inode)) - return 0; + goto out; f2fs_msg(F2FS_I_SB(inode)->sb, KERN_WARNING, "Unexpected flush for atomic writes: ino=%lu, npages=%u", @@ -1382,6 +1382,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp) ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX); if (ret) clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE); +out: + mnt_drop_write_file(filp); return ret; } @@ -1393,13 +1395,13 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp) if (!inode_owner_or_capable(inode)) return -EACCES; - if (f2fs_is_volatile_file(inode)) - return 0; - ret = mnt_want_write_file(filp); if (ret) return ret; + if (f2fs_is_volatile_file(inode)) + goto err_out; + if (f2fs_is_atomic_file(inode)) { clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE); ret = commit_inmem_pages(inode); @@ -1423,32 +1425,48 @@ static int f2fs_ioc_start_volatile_write(struct file *filp) if (!inode_owner_or_capable(inode)) return -EACCES; + ret = mnt_want_write_file(filp); + if (ret) + return ret; + if (f2fs_is_volatile_file(inode)) - return 0; + goto out; ret = f2fs_convert_inline_inode(inode); if (ret) - return ret; + goto out; set_inode_flag(F2FS_I(inode), FI_VOLATILE_FILE); f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); - return 0; +out: + mnt_drop_write_file(filp); + return ret; } static int f2fs_ioc_release_volatile_write(struct file *filp) { struct inode *inode = file_inode(filp); + int ret; if (!inode_owner_or_capable(inode)) return -EACCES; + ret = mnt_want_write_file(filp); + if (ret) + return ret; + if (!f2fs_is_volatile_file(inode)) - return 0; + goto out; - if (!f2fs_is_first_block_written(inode)) - return truncate_partial_data_page(inode, 0, true); + if (!f2fs_is_first_block_written(inode)) { + ret = truncate_partial_data_page(inode, 0, true); + goto out; + } - return punch_hole(inode, 0, F2FS_BLKSIZE); + ret = punch_hole(inode, 0, F2FS_BLKSIZE); +out: + mnt_drop_write_file(filp); + return ret; } static int f2fs_ioc_abort_volatile_write(struct file *filp) @@ -1481,6 +1499,7 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg) struct f2fs_sb_info *sbi = F2FS_I_SB(inode); struct super_block *sb = sbi->sb; __u32 in; + int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; @@ -1488,6 +1507,10 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg) if (get_user(in, (__u32 __user *)arg)) return -EFAULT; + ret = mnt_want_write_file(filp); + if (ret) + return ret; + switch (in) { case F2FS_GOING_DOWN_FULLSYNC: sb = freeze_bdev(sb->s_bdev); @@ -1509,10 +1532,13 @@ static int f2fs_ioc_shutdown(struct file *filp, unsigned long arg) f2fs_stop_checkpoint(sbi); break; default: - return -EINVAL; + ret = -EINVAL; + goto out; } f2fs_update_time(sbi, REQ_TIME); - return 0; +out: + mnt_drop_write_file(filp); + return ret; } static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg) @@ -1533,9 +1559,14 @@ static int f2fs_ioc_fitrim(struct file *filp, unsigned long arg) sizeof(range))) return -EFAULT; + ret = mnt_want_write_file(filp); + if (ret) + return ret; + range.minlen = max((unsigned int)range.minlen, q->limits.discard_granularity); ret = f2fs_trim_fs(F2FS_SB(sb), &range); + mnt_drop_write_file(filp); if (ret < 0) return ret; @@ -1560,13 +1591,21 @@ static int f2fs_ioc_set_encryption_policy(struct file *filp, unsigned long arg) { struct fscrypt_policy policy; struct inode *inode = file_inode(filp); + int ret; if (copy_from_user(&policy, (struct fscrypt_policy __user *)arg, sizeof(policy))) return -EFAULT; + ret = mnt_want_write_file(filp); + if (ret) + return ret; + f2fs_update_time(F2FS_I_SB(inode), REQ_TIME); - return fscrypt_process_policy(inode, &policy); + ret = fscrypt_process_policy(inode, &policy); + + mnt_drop_write_file(filp); + return ret; } static int f2fs_ioc_get_encryption_policy(struct file *filp, unsigned long arg) @@ -1623,6 +1662,7 @@ static int f2fs_ioc_gc(struct file *filp, unsigned long arg) struct inode *inode = file_inode(filp); struct f2fs_sb_info *sbi = F2FS_I_SB(inode); __u32 sync; + int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; @@ -1633,20 +1673,30 @@ static int f2fs_ioc_gc(struct file *filp, unsigned long arg) if (f2fs_readonly(sbi->sb)) return -EROFS; + ret = mnt_want_write_file(filp); + if (ret) + return ret; + if (!sync) { - if (!mutex_trylock(&sbi->gc_mutex)) - return -EBUSY; + if (!mutex_trylock(&sbi->gc_mutex)) { + ret = -EBUSY; + goto out; + } } else { mutex_lock(&sbi->gc_mutex); } - return f2fs_gc(sbi, sync); + ret = f2fs_gc(sbi, sync); +out: + mnt_drop_write_file(filp); + return ret; } static int f2fs_ioc_write_checkpoint(struct file *filp, unsigned long arg) { struct inode *inode = file_inode(filp); struct f2fs_sb_info *sbi = F2FS_I_SB(inode); + int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; @@ -1654,7 +1704,14 @@ static int f2fs_ioc_write_checkpoint(struct file *filp, unsigned long arg) if (f2fs_readonly(sbi->sb)) return -EROFS; - return f2fs_sync_fs(sbi->sb, 1); + ret = mnt_want_write_file(filp); + if (ret) + return ret; + + ret = f2fs_sync_fs(sbi->sb, 1); + + mnt_drop_write_file(filp); + return ret; } static int f2fs_defragment_range(struct f2fs_sb_info *sbi,