From 5aca284210ce827f780ea2f4f9c6ab8d6e2d6648 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 1 Jul 2019 08:25:34 -0700 Subject: vfs: create a generic checking and prep function for FS_IOC_SETFLAGS Create a generic function to check incoming FS_IOC_SETFLAGS flag values and later prepare the inode for updates so that we can standardize the implementations that follow ext4's flag values. Note that the efivarfs implementation no longer fails a no-op SETFLAGS without CAP_LINUX_IMMUTABLE since that's the behavior in ext*. Signed-off-by: Darrick J. Wong Reviewed-by: Jan Kara Reviewed-by: Christoph Hellwig Acked-by: David Sterba Reviewed-by: Bob Peterson --- fs/gfs2/file.c | 42 +++++++++++++++++++++++++++++------------- 1 file changed, 29 insertions(+), 13 deletions(-) (limited to 'fs/gfs2/file.c') diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c index d174b1f8fd08..1cb0c3afd3dc 100644 --- a/fs/gfs2/file.c +++ b/fs/gfs2/file.c @@ -136,27 +136,36 @@ static struct { {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA}, }; +static inline u32 gfs2_gfsflags_to_fsflags(struct inode *inode, u32 gfsflags) +{ + int i; + u32 fsflags = 0; + + 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; + return fsflags; +} + 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 i, error; - u32 gfsflags, fsflags = 0; + int error; + u32 fsflags; gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); error = gfs2_glock_nq(&gh); if (error) goto out_uninit; - 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; + fsflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags); if (put_user(fsflags, ptr)) error = -EFAULT; @@ -200,9 +209,11 @@ void gfs2_set_inode_flags(struct inode *inode) * @filp: file pointer * @reqflags: The flags to set * @mask: Indicates which flags are valid + * @fsflags: The FS_* inode flags passed in * */ -static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) +static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask, + const u32 fsflags) { struct inode *inode = file_inode(filp); struct gfs2_inode *ip = GFS2_I(inode); @@ -210,7 +221,7 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) struct buffer_head *bh; struct gfs2_holder gh; int error; - u32 new_flags, flags; + u32 new_flags, flags, oldflags; error = mnt_want_write_file(filp); if (error) @@ -220,6 +231,11 @@ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) if (error) goto out_drop_write; + oldflags = gfs2_gfsflags_to_fsflags(inode, ip->i_diskflags); + error = vfs_ioc_setflags_prepare(inode, oldflags, fsflags); + if (error) + goto out; + error = -EACCES; if (!inode_owner_or_capable(inode)) goto out; @@ -308,7 +324,7 @@ static int gfs2_set_flags(struct file *filp, u32 __user *ptr) mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA); } - return do_gfs2_set_flags(filp, gfsflags, mask); + return do_gfs2_set_flags(filp, gfsflags, mask, fsflags); } static int gfs2_getlabel(struct file *filp, char __user *label) -- cgit v1.2.3-59-g8ed1b