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f2fs: add F2FS_IOC_SEC_TRIM_FILE ioctl

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Added a new ioctl to send discard commands or/and zero out
to selected data area of a regular file for security reason.

The way of handling range.len of F2FS_IOC_SEC_TRIM_FILE:
1. Added -1 value support for range.len to secure trim the whole blocks
   starting from range.start regardless of i_size.
2. If the end of the range passes over the end of file, it means until
   the end of file (i_size).
3. ignored the case of that range.len is zero to prevent the function
   from making end_addr zero and triggering different behaviour of
   the function.

Signed-off-by: Daeho Jeong <daehojeong@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Daeho Jeong
2020-07-21 12:21:11 +09:00
committed by Jaegeuk Kim
parent b0f3b87fb3
commit 9af846486d
2 changed files with 206 additions and 0 deletions
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15
fs/f2fs/f2fs.h
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@@ -430,6 +430,8 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
_IOR(F2FS_IOCTL_MAGIC, 18, __u64)
#define F2FS_IOC_RESERVE_COMPRESS_BLOCKS \
_IOR(F2FS_IOCTL_MAGIC, 19, __u64)
#define F2FS_IOC_SEC_TRIM_FILE _IOW(F2FS_IOCTL_MAGIC, 20, \
struct f2fs_sectrim_range)
/*
* should be same as XFS_IOC_GOINGDOWN.
@@ -442,6 +444,13 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
#define F2FS_GOING_DOWN_METAFLUSH 0x3 /* going down with meta flush */
#define F2FS_GOING_DOWN_NEED_FSCK 0x4 /* going down to trigger fsck */
/*
* Flags used by F2FS_IOC_SEC_TRIM_FILE
*/
#define F2FS_TRIM_FILE_DISCARD 0x1 /* send discard command */
#define F2FS_TRIM_FILE_ZEROOUT 0x2 /* zero out */
#define F2FS_TRIM_FILE_MASK 0x3
struct f2fs_gc_range {
u32 sync;
u64 start;
@@ -465,6 +474,12 @@ struct f2fs_flush_device {
u32 segments; /* # of segments to flush */
};
struct f2fs_sectrim_range {
u64 start;
u64 len;
u64 flags;
};
/* for inline stuff */
#define DEF_INLINE_RESERVED_SIZE 1
static inline int get_extra_isize(struct inode *inode);