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 <agrue...@redhat.com>
---
fs/gfs2/file.c | 102 ++++++++++++++++++++++++++-------------------------------
1 file changed, 47 insertions(+), 55 deletions(-)
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 33a0cb5701a3..1a33e55de1bc 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -108,45 +108,22 @@ 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)
@@ -154,17 +131,23 @@ 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;
@@ -199,7 +182,6 @@ 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)
@@ -238,10 +220,6 @@ 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;
@@ -289,19 +267,33 @@ static int do_gfs2_set_flags(struct file *filp, u32
reqflags, u32 mask)
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;
+ }
+ }
+ 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, ~(GFS2_DIF_SYSTEM |
GFS2_DIF_JDATA));
+
+ return do_gfs2_set_flags(filp, gfsflags, mask);
}
static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
--
2.13.5
