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: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Andrew Price <anprice@redhat.com> Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher
parent
61d6899ad4
commit
b16f7e57b7
102
fs/gfs2/file.c
102
fs/gfs2/file.c
@ -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)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user