| Message ID | 1484062757-12433-5-git-send-email-amir73il@gmail.com (mailing list archive) |
|---|---|
| State | Accepted, archived |
| Headers | show |
On Tue, Jan 10, 2017 at 05:39:15PM +0200, Amir Goldstein wrote: > The size of the xfs_mode_to_ftype[] conversion table > was too small to handle an invalid value of mode=S_IFMT. > > Instead of fixing the table size, replace the conversion table > with a conversion helper that uses a switch statement. > > Suggested-by: Christoph Hellwig <hch@lst.de> > Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> --D > --- > fs/xfs/libxfs/xfs_dir2.c | 36 ++++++++++++++++++++++-------------- > fs/xfs/libxfs/xfs_dir2.h | 5 ++--- > fs/xfs/xfs_iops.c | 2 +- > 3 files changed, 25 insertions(+), 18 deletions(-) > > diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c > index 4f7913f..eb64f38 100644 > --- a/fs/xfs/libxfs/xfs_dir2.c > +++ b/fs/xfs/libxfs/xfs_dir2.c > @@ -36,21 +36,29 @@ > struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR }; > > /* > - * @mode, if set, indicates that the type field needs to be set up. > - * This uses the transformation from file mode to DT_* as defined in linux/fs.h > - * for file type specification. This will be propagated into the directory > - * structure if appropriate for the given operation and filesystem config. > + * Convert inode mode to directory entry filetype > */ > -const unsigned char xfs_mode_to_ftype[S_IFMT >> S_SHIFT] = { > - [0] = XFS_DIR3_FT_UNKNOWN, > - [S_IFREG >> S_SHIFT] = XFS_DIR3_FT_REG_FILE, > - [S_IFDIR >> S_SHIFT] = XFS_DIR3_FT_DIR, > - [S_IFCHR >> S_SHIFT] = XFS_DIR3_FT_CHRDEV, > - [S_IFBLK >> S_SHIFT] = XFS_DIR3_FT_BLKDEV, > - [S_IFIFO >> S_SHIFT] = XFS_DIR3_FT_FIFO, > - [S_IFSOCK >> S_SHIFT] = XFS_DIR3_FT_SOCK, > - [S_IFLNK >> S_SHIFT] = XFS_DIR3_FT_SYMLINK, > -}; > +const unsigned char xfs_mode_to_ftype(int mode) > +{ > + switch (mode & S_IFMT) { > + case S_IFREG: > + return XFS_DIR3_FT_REG_FILE; > + case S_IFDIR: > + return XFS_DIR3_FT_DIR; > + case S_IFCHR: > + return XFS_DIR3_FT_CHRDEV; > + case S_IFBLK: > + return XFS_DIR3_FT_BLKDEV; > + case S_IFIFO: > + return XFS_DIR3_FT_FIFO; > + case S_IFSOCK: > + return XFS_DIR3_FT_SOCK; > + case S_IFLNK: > + return XFS_DIR3_FT_SYMLINK; > + default: > + return XFS_DIR3_FT_UNKNOWN; > + } > +} > > /* > * ASCII case-insensitive (ie. A-Z) support for directories that was > diff --git a/fs/xfs/libxfs/xfs_dir2.h b/fs/xfs/libxfs/xfs_dir2.h > index 72df0dc..d4b77ab 100644 > --- a/fs/xfs/libxfs/xfs_dir2.h > +++ b/fs/xfs/libxfs/xfs_dir2.h > @@ -35,10 +35,9 @@ struct xfs_dir2_data_unused; > extern struct xfs_name xfs_name_dotdot; > > /* > - * directory filetype conversion tables. > + * Convert inode mode to directory entry filetype > */ > -#define S_SHIFT 12 > -extern const unsigned char xfs_mode_to_ftype[]; > +extern const unsigned char xfs_mode_to_ftype(int mode); > > /* > * directory operations vector for encode/decode routines > diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c > index 308bebb..821f08d 100644 > --- a/fs/xfs/xfs_iops.c > +++ b/fs/xfs/xfs_iops.c > @@ -103,7 +103,7 @@ xfs_dentry_to_name( > { > namep->name = dentry->d_name.name; > namep->len = dentry->d_name.len; > - namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT]; > + namep->type = xfs_mode_to_ftype(mode); > } > > STATIC void > -- > 2.7.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-xfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c index 4f7913f..eb64f38 100644 --- a/fs/xfs/libxfs/xfs_dir2.c +++ b/fs/xfs/libxfs/xfs_dir2.c @@ -36,21 +36,29 @@ struct xfs_name xfs_name_dotdot = { (unsigned char *)"..", 2, XFS_DIR3_FT_DIR }; /* - * @mode, if set, indicates that the type field needs to be set up. - * This uses the transformation from file mode to DT_* as defined in linux/fs.h - * for file type specification. This will be propagated into the directory - * structure if appropriate for the given operation and filesystem config. + * Convert inode mode to directory entry filetype */ -const unsigned char xfs_mode_to_ftype[S_IFMT >> S_SHIFT] = { - [0] = XFS_DIR3_FT_UNKNOWN, - [S_IFREG >> S_SHIFT] = XFS_DIR3_FT_REG_FILE, - [S_IFDIR >> S_SHIFT] = XFS_DIR3_FT_DIR, - [S_IFCHR >> S_SHIFT] = XFS_DIR3_FT_CHRDEV, - [S_IFBLK >> S_SHIFT] = XFS_DIR3_FT_BLKDEV, - [S_IFIFO >> S_SHIFT] = XFS_DIR3_FT_FIFO, - [S_IFSOCK >> S_SHIFT] = XFS_DIR3_FT_SOCK, - [S_IFLNK >> S_SHIFT] = XFS_DIR3_FT_SYMLINK, -}; +const unsigned char xfs_mode_to_ftype(int mode) +{ + switch (mode & S_IFMT) { + case S_IFREG: + return XFS_DIR3_FT_REG_FILE; + case S_IFDIR: + return XFS_DIR3_FT_DIR; + case S_IFCHR: + return XFS_DIR3_FT_CHRDEV; + case S_IFBLK: + return XFS_DIR3_FT_BLKDEV; + case S_IFIFO: + return XFS_DIR3_FT_FIFO; + case S_IFSOCK: + return XFS_DIR3_FT_SOCK; + case S_IFLNK: + return XFS_DIR3_FT_SYMLINK; + default: + return XFS_DIR3_FT_UNKNOWN; + } +} /* * ASCII case-insensitive (ie. A-Z) support for directories that was diff --git a/fs/xfs/libxfs/xfs_dir2.h b/fs/xfs/libxfs/xfs_dir2.h index 72df0dc..d4b77ab 100644 --- a/fs/xfs/libxfs/xfs_dir2.h +++ b/fs/xfs/libxfs/xfs_dir2.h @@ -35,10 +35,9 @@ struct xfs_dir2_data_unused; extern struct xfs_name xfs_name_dotdot; /* - * directory filetype conversion tables. + * Convert inode mode to directory entry filetype */ -#define S_SHIFT 12 -extern const unsigned char xfs_mode_to_ftype[]; +extern const unsigned char xfs_mode_to_ftype(int mode); /* * directory operations vector for encode/decode routines diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c index 308bebb..821f08d 100644 --- a/fs/xfs/xfs_iops.c +++ b/fs/xfs/xfs_iops.c @@ -103,7 +103,7 @@ xfs_dentry_to_name( { namep->name = dentry->d_name.name; namep->len = dentry->d_name.len; - namep->type = xfs_mode_to_ftype[(mode & S_IFMT) >> S_SHIFT]; + namep->type = xfs_mode_to_ftype(mode); } STATIC void
The size of the xfs_mode_to_ftype[] conversion table was too small to handle an invalid value of mode=S_IFMT. Instead of fixing the table size, replace the conversion table with a conversion helper that uses a switch statement. Suggested-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Amir Goldstein <amir73il@gmail.com> --- fs/xfs/libxfs/xfs_dir2.c | 36 ++++++++++++++++++++++-------------- fs/xfs/libxfs/xfs_dir2.h | 5 ++--- fs/xfs/xfs_iops.c | 2 +- 3 files changed, 25 insertions(+), 18 deletions(-)