Commit b16f7e57 authored by Andreas Gruenbacher's avatar Andreas Gruenbacher
Browse files

gfs2: Fix and clean up {GET,SET}FLAGS ioctl 



Switch to a simple array for mapping between the FS_*_FL and GFS_DIF_*
flags.  Clarify how the mapping between FS_JOURNAL_DATA_FL and the
filesystem flags works.  The GFS2_DIF_SYSTEM flag cannot be set from
user space, so remove it from GFS2_FLAGS_USER_SET.  Fail with -EINVAL
when trying to set flags that are not supported instead of silently
ignoring those flags.

Partially fixes xfstest generic/424.

Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: default avatarAndrew Price <anprice@redhat.com>
Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
parent 61d6899a

fs/gfs2/file.c

+47 −55
Original line number Diff line number Diff line
@@ -119,45 +119,22 @@ static int gfs2_readdir(struct file *file, struct dir_context *ctx) 
}



/**

 * fsflags_cvt

 * @table: A table of 32 u32 flags

 * @val: a 32 bit value to convert

 * fsflag_gfs2flag

 *

 * This function can be used to convert between fsflags values and

 * GFS2's own flags values.

 *

 * Returns: the converted flags

 * The FS_JOURNAL_DATA_FL flag maps to GFS2_DIF_INHERIT_JDATA for directories,

 * and to GFS2_DIF_JDATA for non-directories.

 */

static u32 fsflags_cvt(const u32 *table, u32 val)

{

	u32 res = 0;

	while(val) {

		if (val & 1)

			res |= *table;

		table++;

		val >>= 1;

	}

	return res;

}



static const u32 fsflags_to_gfs2[32] = {

	[3] = GFS2_DIF_SYNC,

	[4] = GFS2_DIF_IMMUTABLE,

	[5] = GFS2_DIF_APPENDONLY,

	[7] = GFS2_DIF_NOATIME,

	[12] = GFS2_DIF_EXHASH,

	[14] = GFS2_DIF_INHERIT_JDATA,

	[17] = GFS2_DIF_TOPDIR,

};



static const u32 gfs2_to_fsflags[32] = {

	[gfs2fl_Sync] = FS_SYNC_FL,

	[gfs2fl_Immutable] = FS_IMMUTABLE_FL,

	[gfs2fl_AppendOnly] = FS_APPEND_FL,

	[gfs2fl_NoAtime] = FS_NOATIME_FL,

	[gfs2fl_ExHash] = FS_INDEX_FL,

	[gfs2fl_TopLevel] = FS_TOPDIR_FL,

	[gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,

static struct {

	u32 fsflag;

	u32 gfsflag;

} fsflag_gfs2flag[] = {

	{FS_SYNC_FL, GFS2_DIF_SYNC},

	{FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE},

	{FS_APPEND_FL, GFS2_DIF_APPENDONLY},

	{FS_NOATIME_FL, GFS2_DIF_NOATIME},

	{FS_INDEX_FL, GFS2_DIF_EXHASH},

	{FS_TOPDIR_FL, GFS2_DIF_TOPDIR},

	{FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA},

};



static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
@@ -165,17 +142,23 @@ static int gfs2_get_flags(struct file *filp, u32 __user *ptr) 
	struct inode *inode = file_inode(filp);

	struct gfs2_inode *ip = GFS2_I(inode);

	struct gfs2_holder gh;

	int error;

	u32 fsflags;

	int i, error;

	u32 gfsflags, fsflags = 0;



	gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);

	error = gfs2_glock_nq(&gh);

	if (error)

		goto out_uninit;



	fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);

	if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)

		fsflags |= FS_JOURNAL_DATA_FL;

	gfsflags = ip->i_diskflags;

	if (S_ISDIR(inode->i_mode))

		gfsflags &= ~GFS2_DIF_JDATA;

	else

		gfsflags &= ~GFS2_DIF_INHERIT_JDATA;

	for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)

		if (gfsflags & fsflag_gfs2flag[i].gfsflag)

			fsflags |= fsflag_gfs2flag[i].fsflag;



	if (put_user(fsflags, ptr))

		error = -EFAULT;
@@ -210,7 +193,6 @@ void gfs2_set_inode_flags(struct inode *inode) 
			     GFS2_DIF_APPENDONLY|		\

			     GFS2_DIF_NOATIME|			\

			     GFS2_DIF_SYNC|			\

			     GFS2_DIF_SYSTEM|			\

			     GFS2_DIF_TOPDIR|			\

			     GFS2_DIF_INHERIT_JDATA)
@@ -249,10 +231,6 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) 
	if ((new_flags ^ flags) == 0)

		goto out;



	error = -EINVAL;

	if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)

		goto out;



	error = -EPERM;

	if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))

		goto out;
@@ -303,19 +281,33 @@ out_drop_write: 
static int gfs2_set_flags(struct file *filp, u32 __user *ptr)

{

	struct inode *inode = file_inode(filp);

	u32 fsflags, gfsflags;

	u32 fsflags, gfsflags = 0;

	u32 mask;

	int i;



	if (get_user(fsflags, ptr))

		return -EFAULT;



	gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);

	if (!S_ISDIR(inode->i_mode)) {

		gfsflags &= ~GFS2_DIF_TOPDIR;

		if (gfsflags & GFS2_DIF_INHERIT_JDATA)

			gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);

		return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_SYSTEM);

	for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {

		if (fsflags & fsflag_gfs2flag[i].fsflag) {

			fsflags &= ~fsflag_gfs2flag[i].fsflag;

			gfsflags |= fsflag_gfs2flag[i].gfsflag;

		}

	}

	return do_gfs2_set_flags(filp, gfsflags, ~(GFS2_DIF_SYSTEM | GFS2_DIF_JDATA));

	if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)

		return -EINVAL;



	mask = GFS2_FLAGS_USER_SET;

	if (S_ISDIR(inode->i_mode)) {

		mask &= ~GFS2_DIF_JDATA;

	} else {

		/* The GFS2_DIF_TOPDIR flag is only valid for directories. */

		if (gfsflags & GFS2_DIF_TOPDIR)

			return -EINVAL;

		mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);

	}



	return do_gfs2_set_flags(filp, gfsflags, mask);

}



static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)

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