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Date: Mon, 21 Oct 2013 18:20:44 -0700
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu
Cc: linux-ext4@...r.kernel.org
Subject: Re: [PATCH 24/25] misc: add fuse2fs, a FUSE server for e2fsprogs
On Thu, Oct 17, 2013 at 09:51:41PM -0700, Darrick J. Wong wrote:
> This is the initial implementation of a FUSE server based on
> e2fsprogs. The point of this program is to enable ext4 to run on any
> OS that FUSE supports (and doesn't already have a native driver), such
> as MacOS X, BSDs, and Windows. The code requires FUSE API v28, which
> is available in Linux fuse and osxfuse releases that are available as
> of August 2013.
>
> v2: Remove unnecessary calls to ext2fs_flush(), and ensure that xattr
> blocks are freed when removing an inode.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
> ---
> MCONFIG.in | 1
> configure | 89 ++
> configure.in | 9
> misc/Makefile.in | 15
> misc/fuse2fs.c | 2837 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 2949 insertions(+), 2 deletions(-)
> create mode 100644 misc/fuse2fs.c
>
>
> diff --git a/MCONFIG.in b/MCONFIG.in
> index fa2b03e..9f88b55 100644
> --- a/MCONFIG.in
> +++ b/MCONFIG.in
> @@ -93,6 +93,7 @@ LIBCOM_ERR = $(LIB)/libcom_err@..._EXT@ @PRIVATE_LIBS_CMT@ @SEM_INIT_LIB@
> LIBE2P = $(LIB)/libe2p@..._EXT@
> LIBEXT2FS = $(LIB)/libext2fs@..._EXT@
> LIBUUID = @LIBUUID@ @SOCKET_LIB@
> +LIBFUSE = @FUSE_LIB@
> LIBQUOTA = @STATIC_LIBQUOTA@
> LIBBLKID = @LIBBLKID@ @PRIVATE_LIBS_CMT@ $(LIBUUID)
> LIBINTL = @LIBINTL@
> diff --git a/configure b/configure
> index 2338fbe..c666235 100755
> --- a/configure
> +++ b/configure
> @@ -639,6 +639,8 @@ CYGWIN_CMT
> LINUX_CMT
> UNI_DIFF_OPTS
> SEM_INIT_LIB
> +FUSE_CMT
> +FUSE_LIB
> SOCKET_LIB
> SIZEOF_OFF_T
> SIZEOF_LONG_LONG
> @@ -11172,6 +11174,93 @@ if test "x$ac_cv_lib_socket_socket" = xyes; then :
> fi
>
>
> +FUSE_CMT=''
> +FUSE_LIB=''
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for fuse_main in -losxfuse" >&5
> +$as_echo_n "checking for fuse_main in -losxfuse... " >&6; }
> +if test "${ac_cv_lib_osxfuse_fuse_main+set}" = set; then :
> + $as_echo_n "(cached) " >&6
> +else
> + ac_check_lib_save_LIBS=$LIBS
> +LIBS="-losxfuse $LIBS"
> +cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> +/* end confdefs.h. */
> +
> +/* Override any GCC internal prototype to avoid an error.
> + Use char because int might match the return type of a GCC
> + builtin and then its argument prototype would still apply. */
> +#ifdef __cplusplus
> +extern "C"
> +#endif
> +char fuse_main ();
> +int
> +main ()
> +{
> +return fuse_main ();
> + ;
> + return 0;
> +}
> +_ACEOF
> +if ac_fn_c_try_link "$LINENO"; then :
> + ac_cv_lib_osxfuse_fuse_main=yes
> +else
> + ac_cv_lib_osxfuse_fuse_main=no
> +fi
> +rm -f core conftest.err conftest.$ac_objext \
> + conftest$ac_exeext conftest.$ac_ext
> +LIBS=$ac_check_lib_save_LIBS
> +fi
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_osxfuse_fuse_main" >&5
> +$as_echo "$ac_cv_lib_osxfuse_fuse_main" >&6; }
> +if test "x$ac_cv_lib_osxfuse_fuse_main" = x""yes; then :
> + FUSE_LIB=-losxfuse
> +else
> + { $as_echo "$as_me:${as_lineno-$LINENO}: checking for fuse_main in -lfuse" >&5
> +$as_echo_n "checking for fuse_main in -lfuse... " >&6; }
> +if test "${ac_cv_lib_fuse_fuse_main+set}" = set; then :
> + $as_echo_n "(cached) " >&6
> +else
> + ac_check_lib_save_LIBS=$LIBS
> +LIBS="-lfuse $LIBS"
> +cat confdefs.h - <<_ACEOF >conftest.$ac_ext
> +/* end confdefs.h. */
> +
> +/* Override any GCC internal prototype to avoid an error.
> + Use char because int might match the return type of a GCC
> + builtin and then its argument prototype would still apply. */
> +#ifdef __cplusplus
> +extern "C"
> +#endif
> +char fuse_main ();
> +int
> +main ()
> +{
> +return fuse_main ();
> + ;
> + return 0;
> +}
> +_ACEOF
> +if ac_fn_c_try_link "$LINENO"; then :
> + ac_cv_lib_fuse_fuse_main=yes
> +else
> + ac_cv_lib_fuse_fuse_main=no
> +fi
> +rm -f core conftest.err conftest.$ac_objext \
> + conftest$ac_exeext conftest.$ac_ext
> +LIBS=$ac_check_lib_save_LIBS
> +fi
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_fuse_fuse_main" >&5
> +$as_echo "$ac_cv_lib_fuse_fuse_main" >&6; }
> +if test "x$ac_cv_lib_fuse_fuse_main" = x""yes; then :
> + FUSE_LIB=-lfuse
> +else
> + FUSE_CMT="#"
> +fi
> +
> +fi
> +
> +
> +
> { $as_echo "$as_me:${as_lineno-$LINENO}: checking for optreset" >&5
> $as_echo_n "checking for optreset... " >&6; }
> if ${ac_cv_have_optreset+:} false; then :
> diff --git a/configure.in b/configure.in
> index 049dc11..623adc8 100644
> --- a/configure.in
> +++ b/configure.in
> @@ -1127,6 +1127,15 @@ SOCKET_LIB=''
> AC_CHECK_LIB(socket, socket, [SOCKET_LIB=-lsocket])
> AC_SUBST(SOCKET_LIB)
> dnl
> +dnl Check to see if the FUSE library is -lfuse or -losxfuse
> +dnl
> +FUSE_CMT=''
> +FUSE_LIB=''
> +dnl osxfuse.dylib supersedes fuselib.dylib
> +AC_CHECK_LIB(osxfuse, fuse_main, [FUSE_LIB=-losxfuse], [AC_CHECK_LIB(fuse, fuse_main, [FUSE_LIB=-lfuse], [FUSE_CMT="#"])])
> +AC_SUBST(FUSE_LIB)
> +AC_SUBST(FUSE_CMT)
> +dnl
> dnl See if optreset exists
> dnl
> AC_MSG_CHECKING(for optreset)
> diff --git a/misc/Makefile.in b/misc/Makefile.in
> index a798f96..1838d03 100644
> --- a/misc/Makefile.in
> +++ b/misc/Makefile.in
> @@ -26,9 +26,12 @@ INSTALL = @INSTALL@
> @BLKID_CMT@...DFS_LINK= findfs
> @BLKID_CMT@...DFS_MAN= findfs.8
>
> +@...E_CMT@...E_PROG= fuse2fs
> +
> SPROGS= mke2fs badblocks tune2fs dumpe2fs $(BLKID_PROG) logsave \
> $(E2IMAGE_PROG) @FSCK_PROG@ e2undo
> -USPROGS= mklost+found filefrag e2freefrag $(UUIDD_PROG) $(E4DEFRAG_PROG)
> +USPROGS= mklost+found filefrag e2freefrag $(UUIDD_PROG) $(E4DEFRAG_PROG) \
> + $(FUSE_PROG)
> SMANPAGES= tune2fs.8 mklost+found.8 mke2fs.8 dumpe2fs.8 badblocks.8 \
> e2label.8 $(FINDFS_MAN) $(BLKID_MAN) $(E2IMAGE_MAN) \
> logsave.8 filefrag.8 e2freefrag.8 e2undo.8 \
> @@ -56,6 +59,7 @@ FILEFRAG_OBJS= filefrag.o
> E2UNDO_OBJS= e2undo.o
> E4DEFRAG_OBJS= e4defrag.o
> E2FREEFRAG_OBJS= e2freefrag.o
> +FUSE2FS_OBJS= fuse2fs.o
>
> PROFILED_TUNE2FS_OBJS= profiled/tune2fs.o profiled/util.o
> PROFILED_MKLPF_OBJS= profiled/mklost+found.o
> @@ -75,6 +79,7 @@ PROFILED_FILEFRAG_OBJS= profiled/filefrag.o
> PROFILED_E2FREEFRAG_OBJS= profiled/e2freefrag.o
> PROFILED_E2UNDO_OBJS= profiled/e2undo.o
> PROFILED_E4DEFRAG_OBJS= profiled/e4defrag.o
> +PROFILED_FUSE2FS_OJBS= profiled/fuse2fs.o
>
> SRCS= $(srcdir)/tune2fs.c $(srcdir)/mklost+found.c $(srcdir)/mke2fs.c \
> $(srcdir)/chattr.c $(srcdir)/lsattr.c $(srcdir)/dumpe2fs.c \
> @@ -82,7 +87,7 @@ SRCS= $(srcdir)/tune2fs.c $(srcdir)/mklost+found.c $(srcdir)/mke2fs.c \
> $(srcdir)/uuidgen.c $(srcdir)/blkid.c $(srcdir)/logsave.c \
> $(srcdir)/filefrag.c $(srcdir)/base_device.c \
> $(srcdir)/ismounted.c $(srcdir)/../e2fsck/profile.c \
> - $(srcdir)/e2undo.c $(srcdir)/e2freefrag.c
> + $(srcdir)/e2undo.c $(srcdir)/e2freefrag.c $(srcdir)/fuse2fs.c
>
> LIBS= $(LIBEXT2FS) $(LIBCOM_ERR)
> DEPLIBS= $(LIBEXT2FS) $(DEPLIBCOM_ERR)
> @@ -335,6 +340,12 @@ filefrag.profiled: $(FILEFRAG_OBJS)
> $(Q) $(CC) $(ALL_LDFLAGS) -g -pg -o filefrag.profiled \
> $(PROFILED_FILEFRAG_OBJS)
>
> +fuse2fs: $(FUSE2FS_OBJS) $(DEPLIBS) $(DEPLIBBLKID) $(DEPLIBUUID) \
> + $(DEPLIBQUOTA) $(LIBEXT2FS)
> + $(E) " LD $@"
> + $(Q) $(CC) $(ALL_LDFLAGS) -o fuse2fs $(FUSE2FS_OBJS) $(LIBS) \
> + $(LIBFUSE) $(LIBBLKID) $(LIBUUID) $(LIBEXT2FS)
> +
> tst_ismounted: $(srcdir)/ismounted.c $(STATIC_LIBEXT2FS) $(DEPLIBCOM_ERR)
> $(E) " LD $@"
> $(CC) -o tst_ismounted $(srcdir)/ismounted.c -DDEBUG $(ALL_CFLAGS) \
> diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
> new file mode 100644
> index 0000000..d1c00df
> --- /dev/null
> +++ b/misc/fuse2fs.c
> @@ -0,0 +1,2837 @@
> +/*
> + * fuse2fs.c - FUSE server for e2fsprogs.
> + *
> + * Copyright (C) 2013 Oracle.
> + *
> + * %Begin-Header%
> + * This file may be redistributed under the terms of the GNU Public
> + * License.
> + * %End-Header%
> + */
> +#define _FILE_OFFSET_BITS 64
> +#define FUSE_USE_VERSION 29
> +#define _GNU_SOURCE
> +#include <pthread.h>
> +#ifdef __linux__
> +# include <linux/fs.h>
> +# include <linux/falloc.h>
> +# include <linux/xattr.h>
> +#endif
> +#include <sys/ioctl.h>
> +#include <unistd.h>
> +#include <fuse.h>
> +#include "ext2fs/ext2fs.h"
> +#include "ext2fs/ext2_fs.h"
> +
> +#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
> +# ifdef _IOR
> +# ifdef _IOW
> +# define SUPPORT_I_FLAGS
> +# endif
> +# endif
> +#endif
> +
> +#ifdef FALLOC_FL_KEEP_SIZE
> +# define FL_KEEP_SIZE_FLAG FALLOC_FL_KEEP_SIZE
> +#else
> +# define FL_KEEP_SIZE_FLAG (0)
> +#endif
> +
> +#ifdef FALLOC_FL_PUNCH_HOLE
> +# define FL_PUNCH_HOLE_FLAG FALLOC_FL_PUNCH_HOLE
> +#else
> +# define FL_PUNCH_HOLE_FLAG (0)
> +#endif
> +
> +/*
> + * ext2_file_t contains a struct inode, so we can't leave files open.
> + * Use this as a proxy instead.
> + */
> +struct fuse2fs_file_handle {
> + ext2_ino_t ino;
> + int open_flags;
> +};
> +
> +/* Main program context */
> +struct fuse2fs {
> + ext2_filsys fs;
> + pthread_mutex_t bfl;
> + int panic_on_error;
> + FILE *err_fp;
> + unsigned int next_generation;
> +};
> +
> +static int __translate_error(ext2_filsys fs, errcode_t err, ext2_ino_t ino,
> + const char *file, int line);
> +#define translate_error(fs, ino, err) __translate_error((fs), (err), (ino), \
> + __FILE__, __LINE__)
> +
> +/* for macosx */
> +#ifndef W_OK
> +# define W_OK 2
> +#endif
> +
> +#ifndef R_OK
> +# define R_OK 4
> +#endif
> +
> +#define EXT4_EPOCH_BITS 2
> +#define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
> +#define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
> +
> +/*
> + * Extended fields will fit into an inode if the filesystem was formatted
> + * with large inodes (-I 256 or larger) and there are not currently any EAs
> + * consuming all of the available space. For new inodes we always reserve
> + * enough space for the kernel's known extended fields, but for inodes
> + * created with an old kernel this might not have been the case. None of
> + * the extended inode fields is critical for correct filesystem operation.
> + * This macro checks if a certain field fits in the inode. Note that
> + * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
> + */
> +#define EXT4_FITS_IN_INODE(ext4_inode, field) \
> + ((offsetof(typeof(*ext4_inode), field) + \
> + sizeof((ext4_inode)->field)) \
> + <= (EXT2_GOOD_OLD_INODE_SIZE + \
> + (ext4_inode)->i_extra_isize)) \
> +
> +static inline __u32 ext4_encode_extra_time(const struct timespec *time)
> +{
> + return (sizeof(time->tv_sec) > 4 ?
> + (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
> + ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK);
> +}
> +
> +static inline void ext4_decode_extra_time(struct timespec *time, __u32 extra)
> +{
> + if (sizeof(time->tv_sec) > 4)
> + time->tv_sec |= (__u64)((extra) & EXT4_EPOCH_MASK) << 32;
> + time->tv_nsec = ((extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
> +}
> +
> +#define EXT4_INODE_SET_XTIME(xtime, timespec, raw_inode) \
> +do { \
> + (raw_inode)->xtime = (timespec)->tv_sec; \
> + if (EXT4_FITS_IN_INODE(raw_inode, xtime ## _extra)) \
> + (raw_inode)->xtime ## _extra = \
> + ext4_encode_extra_time(timespec); \
> +} while (0)
> +
> +#define EXT4_EINODE_SET_XTIME(xtime, timespec, raw_inode) \
> +do { \
> + if (EXT4_FITS_IN_INODE(raw_inode, xtime)) \
> + (raw_inode)->xtime = (timespec)->tv_sec; \
> + if (EXT4_FITS_IN_INODE(raw_inode, xtime ## _extra)) \
> + (raw_inode)->xtime ## _extra = \
> + ext4_encode_extra_time(timespec); \
> +} while (0)
> +
> +#define EXT4_INODE_GET_XTIME(xtime, timespec, raw_inode) \
> +do { \
> + (timespec)->tv_sec = (signed)((raw_inode)->xtime); \
> + if (EXT4_FITS_IN_INODE(raw_inode, xtime ## _extra)) \
> + ext4_decode_extra_time((timespec), \
> + raw_inode->xtime ## _extra); \
> + else \
> + (timespec)->tv_nsec = 0; \
> +} while (0)
> +
> +#define EXT4_EINODE_GET_XTIME(xtime, timespec, raw_inode) \
> +do { \
> + if (EXT4_FITS_IN_INODE(raw_inode, xtime)) \
> + (timespec)->tv_sec = \
> + (signed)((raw_inode)->xtime); \
> + if (EXT4_FITS_IN_INODE(raw_inode, xtime ## _extra)) \
> + ext4_decode_extra_time((timespec), \
> + raw_inode->xtime ## _extra); \
> + else \
> + (timespec)->tv_nsec = 0; \
> +} while (0)
> +
> +static void get_now(struct timespec *now)
> +{
> +#ifdef CLOCK_REALTIME
> + if (!clock_gettime(CLOCK_REALTIME, now))
> + return;
> +#endif
> +
> + now->tv_sec = time(NULL);
> + now->tv_nsec = 0;
> +}
> +
> +static void increment_version(struct ext2_inode_large *inode)
> +{
> + __u64 ver;
> +
> + ver = inode->osd1.linux1.l_i_version;
> + if (EXT4_FITS_IN_INODE(inode, i_version_hi))
> + ver |= (__u64)inode->i_version_hi << 32;
> + ver++;
> + inode->osd1.linux1.l_i_version = ver;
> + if (EXT4_FITS_IN_INODE(inode, i_version_hi))
> + inode->i_version_hi = ver >> 32;
> +}
> +
> +static void init_times(struct ext2_inode_large *inode)
> +{
> + struct timespec now;
> +
> + get_now(&now);
> + EXT4_INODE_SET_XTIME(i_atime, &now, inode);
> + EXT4_INODE_SET_XTIME(i_ctime, &now, inode);
> + EXT4_INODE_SET_XTIME(i_mtime, &now, inode);
> + EXT4_EINODE_SET_XTIME(i_crtime, &now, inode);
> + increment_version(inode);
> +}
> +
> +static int update_ctime(ext2_filsys fs, ext2_ino_t ino,
> + struct ext2_inode_large *pinode)
> +{
> + errcode_t err;
> + struct timespec now;
> + struct ext2_inode_large inode;
> +
> + get_now(&now);
> +
> + /* If user already has a inode buffer, just update that */
> + if (pinode) {
> + increment_version(pinode);
> + EXT4_INODE_SET_XTIME(i_ctime, &now, pinode);
> + return 0;
> + }
> +
> + /* Otherwise we have to read-modify-write the inode */
> + err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
Subtle bug here -- if inode size is 128, the i_extra_size field of the
ext2_inode_large is never set. Later on, EXT4_INODE_SET_XTIME calls
EXT4_FITS_IN_INODE, which depends on i_extra_isize. Therefore, the
i_extra_isize field must always be zeroed.
> + if (err)
> + return translate_error(fs, ino, err);
> +
> + increment_version(&inode);
> + EXT4_INODE_SET_XTIME(i_ctime, &now, &inode);
> +
> + err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err)
> + return translate_error(fs, ino, err);
> +
> + return 0;
> +}
> +
> +static int update_atime(ext2_filsys fs, ext2_ino_t ino)
> +{
> + errcode_t err;
> + struct ext2_inode_large inode, *pinode;
> + struct timespec atime, mtime, now;
> +
> + if (!(fs->flags & EXT2_FLAG_RW))
> + return 0;
> + err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err)
> + return translate_error(fs, ino, err);
> +
> + pinode = &inode;
> + EXT4_INODE_GET_XTIME(i_atime, &atime, pinode);
> + EXT4_INODE_GET_XTIME(i_mtime, &mtime, pinode);
> + get_now(&now);
> + /*
> + * If atime is newer than mtime and atime hasn't been updated in more
> + * than a day, skip the atime update. Same idea as Linux "relatime".
> + */
> + if (atime.tv_sec >= mtime.tv_sec && atime.tv_sec >= now.tv_sec - 86400)
> + return 0;
> + EXT4_INODE_SET_XTIME(i_atime, &now, &inode);
> +
> + err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err)
> + return translate_error(fs, ino, err);
> +
> + return 0;
> +}
> +
> +static int update_mtime(ext2_filsys fs, ext2_ino_t ino)
> +{
> + errcode_t err;
> + struct ext2_inode_large inode;
> + struct timespec now;
> +
> + err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err)
> + return translate_error(fs, ino, err);
> +
> + get_now(&now);
> + EXT4_INODE_SET_XTIME(i_mtime, &now, &inode);
> + EXT4_INODE_SET_XTIME(i_ctime, &now, &inode);
> + increment_version(&inode);
> +
> + err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err)
> + return translate_error(fs, ino, err);
> +
> + return 0;
> +}
> +
> +static int ext2_file_type(unsigned int mode)
> +{
> + if (LINUX_S_ISREG(mode))
> + return EXT2_FT_REG_FILE;
> +
> + if (LINUX_S_ISDIR(mode))
> + return EXT2_FT_DIR;
> +
> + if (LINUX_S_ISCHR(mode))
> + return EXT2_FT_CHRDEV;
> +
> + if (LINUX_S_ISBLK(mode))
> + return EXT2_FT_BLKDEV;
> +
> + if (LINUX_S_ISLNK(mode))
> + return EXT2_FT_SYMLINK;
> +
> + if (LINUX_S_ISFIFO(mode))
> + return EXT2_FT_FIFO;
> +
> + if (LINUX_S_ISSOCK(mode))
> + return EXT2_FT_SOCK;
> +
> + return 0;
> +}
> +
> +static int fs_writeable(ext2_filsys fs)
> +{
> + return (fs->flags & EXT2_FLAG_RW) && (fs->super->s_error_count == 0);
> +}
> +
> +static int __check_access(struct fuse_context *ctxt, ext2_filsys fs,
> + ext2_ino_t ino, int mask, int ignore_flags)
> +{
> + errcode_t err;
> + struct ext2_inode inode;
> + mode_t perms;
> +
> + /* no writing to read-only or broken fs */
> + if ((mask & W_OK) && !fs_writeable(fs))
> + return -EROFS;
> +
> + err = ext2fs_read_inode(fs, ino, &inode);
> + if (err)
> + return translate_error(fs, ino, err);
> +
> + /* existence check */
> + if (mask == 0)
> + return 0;
> +
> + /* is immutable? */
> + if (!ignore_flags && (mask & W_OK) &&
> + (inode.i_flags & EXT2_IMMUTABLE_FL))
> + return -EPERM;
> +
> + perms = inode.i_mode & 0777;
> +
> + /* always allow root */
> + if (ctxt->uid == 0)
> + return 0;
> +
> + /* allow owner, if perms match */
> + if (inode.i_uid == ctxt->uid) {
> + if ((mask << 6) & perms)
> + return 0;
> + return -EPERM;
> + }
> +
> + /* allow group, if perms match */
> + if (inode.i_gid == ctxt->gid) {
> + if ((mask << 3) & perms)
> + return 0;
> + return -EPERM;
> + }
> +
> + /* otherwise check other */
> + if (mask & perms)
> + return 0;
> + return -EPERM;
> +}
> +
> +static int check_inum_access(struct fuse_context *ctxt, ext2_filsys fs,
> + ext2_ino_t ino, int mask)
> +{
> + return __check_access(ctxt, fs, ino, mask, 0);
> +}
> +
> +static int check_flags_access(struct fuse_context *ctxt, ext2_filsys fs,
> + ext2_ino_t ino, int mask)
> +{
> + return __check_access(ctxt, fs, ino, mask, 1);
> +}
> +
> +static void op_destroy(void *p)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> +
> + if (fs->flags & EXT2_FLAG_RW) {
> + fs->super->s_state |= EXT2_VALID_FS;
> + if (fs->super->s_error_count)
> + fs->super->s_state |= EXT2_ERROR_FS;
> + ext2fs_mark_super_dirty(fs);
> + err = ext2fs_set_gdt_csum(fs);
> + if (err)
> + translate_error(fs, 0, err);
> +
> + err = ext2fs_flush2(fs, 0);
> + if (err)
> + translate_error(fs, 0, err);
> + }
> +}
> +
> +static void *op_init(struct fuse_conn_info *conn)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> +
> + if (fs->flags & EXT2_FLAG_RW) {
> + fs->super->s_mnt_count++;
> + fs->super->s_mtime = time(NULL);
> + fs->super->s_state &= ~EXT2_VALID_FS;
> + ext2fs_mark_super_dirty(fs);
> + err = ext2fs_flush2(fs, 0);
> + if (err)
> + translate_error(fs, 0, err);
> + }
> + return ff;
> +}
> +
> +static int stat_inode(ext2_filsys fs, ext2_ino_t ino, struct stat *statbuf)
> +{
> + struct ext2_inode_large inode;
> + dev_t fakedev = 0;
> + errcode_t err;
> + int ret = 0;
> +
> + err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err)
> + return translate_error(fs, ino, err);
> +
> + memcpy(&fakedev, fs->super->s_uuid, sizeof(fakedev));
> + statbuf->st_dev = fakedev;
> + statbuf->st_ino = ino;
> + statbuf->st_mode = inode.i_mode;
> + statbuf->st_nlink = inode.i_links_count;
> + statbuf->st_uid = inode.i_uid;
> + statbuf->st_gid = inode.i_gid;
> + statbuf->st_size = inode.i_size;
> + statbuf->st_blksize = fs->blocksize;
> + statbuf->st_blocks = inode.i_blocks;
> + statbuf->st_atime = inode.i_atime;
> + statbuf->st_mtime = inode.i_mtime;
> + statbuf->st_ctime = inode.i_ctime;
> + if (LINUX_S_ISCHR(inode.i_mode) ||
> + LINUX_S_ISBLK(inode.i_mode)) {
> + if (inode.i_block[0])
> + statbuf->st_rdev = inode.i_block[0];
> + else
> + statbuf->st_rdev = inode.i_block[1];
> + }
> +
> + return ret;
> +}
> +
> +static int op_getattr(const char *path, struct stat *statbuf)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + ext2_ino_t ino;
> + errcode_t err;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> + ret = stat_inode(fs, ino, statbuf);
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +static int op_readlink(const char *path, char *buf, size_t len)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> + ext2_ino_t ino;
> + struct ext2_inode inode;
> + unsigned int got;
> + ext2_file_t file;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err || ino == 0) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + err = ext2fs_read_inode(fs, ino, &inode);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + if (!LINUX_S_ISLNK(inode.i_mode)) {
> + ret = -EINVAL;
> + goto out;
> + }
> +
> + len--;
> + if (inode.i_size < len)
> + len = inode.i_size;
> + if (ext2fs_inode_data_blocks2(fs, &inode)) {
> + /* big symlink */
> +
> + err = ext2fs_file_open(fs, ino, 0, &file);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_read(file, buf, len, &got);
> + if (err || got != len) {
> + ext2fs_file_close(file);
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_close(file);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> + } else
> + /* inline symlink */
> + memcpy(buf, (char *)inode.i_block, len);
> + buf[len] = 0;
> +
> + if (fs_writeable(fs)) {
> + ret = update_atime(fs, ino);
> + if (ret)
> + goto out;
> + }
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +static int op_mknod(const char *path, mode_t mode, dev_t dev)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + ext2_ino_t parent, child;
> + char *temp_path = strdup(path);
> + errcode_t err;
> + char *node_name, a;
> + int filetype;
> + struct ext2_inode_large inode;
> + int ret = 0;
> +
> + if (!temp_path) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name = strrchr(temp_path, '/');
> + if (!node_name) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name++;
> + a = *node_name;
> + *node_name = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_path,
> + &parent);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> +
> + ret = check_inum_access(ctxt, fs, parent, W_OK);
> + if (ret)
> + goto out2;
> +
> + *node_name = a;
> +
> + if (LINUX_S_ISCHR(mode))
> + filetype = EXT2_FT_CHRDEV;
> + else if (LINUX_S_ISBLK(mode))
> + filetype = EXT2_FT_BLKDEV;
> + else if (LINUX_S_ISFIFO(mode))
> + filetype = EXT2_FT_FIFO;
> + else {
> + ret = -EINVAL;
> + goto out2;
> + }
> +
> + err = ext2fs_new_inode(fs, parent, mode, 0, &child);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> +
> + err = ext2fs_link(fs, parent, node_name, child, filetype);
> + if (err == EXT2_ET_DIR_NO_SPACE) {
> + err = ext2fs_expand_dir(fs, parent);
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + err = ext2fs_link(fs, parent, node_name, child,
> + filetype);
> + }
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + ret = update_mtime(fs, parent);
> + if (ret)
> + goto out2;
> +
> + memset(&inode, 0, sizeof(inode));
> + inode.i_mode = mode;
> +
> + if (dev & ~0xFFFF)
> + inode.i_block[1] = dev;
> + else
> + inode.i_block[0] = dev;
> + inode.i_links_count = 1;
> + inode.i_extra_isize = sizeof(struct ext2_inode_large) -
> + EXT2_GOOD_OLD_INODE_SIZE;
> +
> + err = ext2fs_write_new_inode(fs, child, (struct ext2_inode *)&inode);
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out2;
> + }
> +
> + inode.i_generation = ff->next_generation++;
> + init_times(&inode);
> + err = ext2fs_write_inode_full(fs, child, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out2;
> + }
> +
> + ext2fs_inode_alloc_stats2(fs, child, 1, 0);
> +
> +out2:
> + pthread_mutex_unlock(&ff->bfl);
> +out:
> + free(temp_path);
> + return ret;
> +}
> +
> +static int op_mkdir(const char *path, mode_t mode)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + ext2_ino_t parent, child;
> + char *temp_path = strdup(path);
> + errcode_t err;
> + char *node_name, a;
> + struct ext2_inode_large inode;
> + char *block;
> + blk64_t blk;
> + int ret = 0;
> +
> + if (!temp_path) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name = strrchr(temp_path, '/');
> + if (!node_name) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name++;
> + a = *node_name;
> + *node_name = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_path,
> + &parent);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> +
> + ret = check_inum_access(ctxt, fs, parent, W_OK);
> + if (ret)
> + goto out2;
> +
> + *node_name = a;
> +
> + err = ext2fs_mkdir(fs, parent, 0, node_name);
> + if (err == EXT2_ET_DIR_NO_SPACE) {
> + err = ext2fs_expand_dir(fs, parent);
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + err = ext2fs_mkdir(fs, parent, 0, node_name);
> + }
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + ret = update_mtime(fs, parent);
> + if (ret)
> + goto out2;
> +
> + /* Still have to update the uid/gid of the dir */
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_path,
> + &child);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> +
> + err = ext2fs_read_inode_full(fs, child, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out2;
> + }
> +
> + inode.i_uid = ctxt->uid;
> + inode.i_gid = ctxt->gid;
> + inode.i_generation = ff->next_generation++;
> +
> + err = ext2fs_write_inode_full(fs, child, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out2;
> + }
> +
> + /* Rewrite the directory block checksum, having set i_generation */
> + if (!EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
> + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
> + goto out2;
> + err = ext2fs_new_dir_block(fs, child, parent, &block);
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out2;
> + }
> + err = ext2fs_bmap2(fs, child, (struct ext2_inode *)&inode, NULL, 0, 0,
> + NULL, &blk);
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out3;
> + }
> + err = ext2fs_write_dir_block4(fs, blk, block, 0, child);
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out3;
> + }
> +
> +out3:
> + ext2fs_free_mem(&block);
> +out2:
> + pthread_mutex_unlock(&ff->bfl);
> +out:
> + free(temp_path);
> + return ret;
> +}
> +
> +static int unlink_file_by_name(struct fuse_context *ctxt, ext2_filsys fs,
> + const char *path)
> +{
> + errcode_t err;
> + ext2_ino_t dir;
> + char *filename = strdup(path);
> + char *base_name;
> + int ret;
> +
> + base_name = strrchr(filename, '/');
> + if (base_name) {
> + *base_name++ = '\0';
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, filename,
> + &dir);
> + if (err) {
> + free(filename);
> + return translate_error(fs, 0, err);
> + }
> + } else {
> + dir = EXT2_ROOT_INO;
> + base_name = filename;
> + }
> +
> + ret = check_inum_access(ctxt, fs, dir, W_OK);
> + if (ret) {
> + free(filename);
> + return ret;
> + }
> +
> + err = ext2fs_unlink(fs, dir, base_name, 0, 0);
> + free(filename);
> + if (err)
> + return translate_error(fs, dir, err);
> +
> + return update_mtime(fs, dir);
> +}
> +
> +static int release_blocks_proc(ext2_filsys fs, blk64_t *blocknr,
> + e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
> + blk64_t ref_block EXT2FS_ATTR((unused)),
> + int ref_offset EXT2FS_ATTR((unused)),
> + void *private EXT2FS_ATTR((unused)))
> +{
> + blk64_t blk = *blocknr;
> +
> + if (blk % EXT2FS_CLUSTER_RATIO(fs) == 0)
> + ext2fs_block_alloc_stats2(fs, *blocknr, -1);
> + return 0;
> +}
> +
> +static int remove_inode(struct fuse2fs *ff, ext2_ino_t ino)
> +{
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> + struct ext2_inode_large inode;
> + int ret = 0;
> +
> + err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + switch (inode.i_links_count) {
> + case 0:
> + return 0; /* XXX: already done? */
> + case 1:
> + inode.i_links_count--;
> + inode.i_dtime = fs->now ? fs->now : time(0);
> + break;
> + default:
> + inode.i_links_count--;
> + }
> +
> + ret = update_ctime(fs, ino, &inode);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + if (inode.i_links_count)
> + goto out;
> +
> + err = ext2fs_free_ext_attr(fs, ino, &inode);
> + if (err)
> + goto out;
> + if (ext2fs_inode_has_valid_blocks2(fs, (struct ext2_inode *)&inode))
> + ext2fs_block_iterate3(fs, ino, BLOCK_FLAG_READ_ONLY, NULL,
> + release_blocks_proc, NULL);
> + ext2fs_inode_alloc_stats2(fs, ino, -1,
> + LINUX_S_ISDIR(inode.i_mode));
> +out:
> + return ret;
> +}
> +
> +static int __op_unlink(const char *path)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + ext2_ino_t ino;
> + errcode_t err;
> + int ret = 0;
> +
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, ino, W_OK);
> + if (ret)
> + goto out;
> +
> + ret = unlink_file_by_name(ctxt, fs, path);
> + if (ret)
> + goto out;
> +
> + ret = remove_inode(ff, ino);
> + if (ret)
> + goto out;
> +out:
> + return ret;
> +}
> +
> +static int op_unlink(const char *path)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + int ret;
> +
> + pthread_mutex_lock(&ff->bfl);
> + ret = __op_unlink(path);
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +struct rd_struct {
> + ext2_ino_t parent;
> + int empty;
> +};
> +
> +static int rmdir_proc(ext2_ino_t dir EXT2FS_ATTR((unused)),
> + int entry EXT2FS_ATTR((unused)),
> + struct ext2_dir_entry *dirent,
> + int offset EXT2FS_ATTR((unused)),
> + int blocksize EXT2FS_ATTR((unused)),
> + char *buf EXT2FS_ATTR((unused)),
> + void *private)
> +{
> + struct rd_struct *rds = (struct rd_struct *) private;
> +
> + if (dirent->inode == 0)
> + return 0;
> + if (((dirent->name_len & 0xFF) == 1) && (dirent->name[0] == '.'))
> + return 0;
> + if (((dirent->name_len & 0xFF) == 2) && (dirent->name[0] == '.') &&
> + (dirent->name[1] == '.')) {
> + rds->parent = dirent->inode;
> + return 0;
> + }
> + rds->empty = 0;
> + return 0;
> +}
> +
> +static int op_rmdir(const char *path)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + ext2_ino_t child;
> + errcode_t err;
> + struct ext2_inode inode;
> + struct rd_struct rds;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &child);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, child, W_OK);
> + if (ret)
> + goto out;
> +
> + rds.parent = 0;
> + rds.empty = 1;
> +
> + err = ext2fs_dir_iterate2(fs, child, 0, 0, rmdir_proc, &rds);
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out;
> + }
> +
> + if (rds.empty == 0) {
> + ret = -ENOTEMPTY;
> + goto out;
> + }
> +
> + ret = unlink_file_by_name(ctxt, fs, path);
> + if (ret)
> + goto out;
> + /* Directories have to be "removed" twice. */
> + ret = remove_inode(ff, child);
> + if (ret)
> + goto out;
> + ret = remove_inode(ff, child);
> + if (ret)
> + goto out;
> +
> + if (rds.parent) {
> + err = ext2fs_read_inode(fs, rds.parent, &inode);
> + if (err) {
> + ret = translate_error(fs, rds.parent, err);
> + goto out;
> + }
> + if (inode.i_links_count > 1)
> + inode.i_links_count--;
> + ret = update_mtime(fs, rds.parent);
> + if (ret)
> + goto out;
> + err = ext2fs_write_inode(fs, rds.parent, &inode);
> + if (err) {
> + ret = translate_error(fs, rds.parent, err);
> + goto out;
> + }
> + }
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +static int op_symlink(const char *src, const char *dest)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + ext2_ino_t parent, child;
> + char *temp_path = strdup(dest);
> + errcode_t err;
> + char *node_name, a;
> + struct ext2_inode_large inode;
> + int len = strlen(src);
> + int ret = 0;
> +
> + if (!temp_path) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name = strrchr(temp_path, '/');
> + if (!node_name) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name++;
> + a = *node_name;
> + *node_name = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_path,
> + &parent);
> + *node_name = a;
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> +
> + ret = check_inum_access(ctxt, fs, parent, W_OK);
> + if (ret)
> + goto out2;
> +
> +
> + /* Create symlink */
> + err = ext2fs_symlink(fs, parent, 0, node_name, (char *)src);
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + /* Update parent dir's mtime */
> + ret = update_mtime(fs, parent);
> + if (ret)
> + goto out2;
> +
> + /* Still have to update the uid/gid of the symlink */
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_path,
> + &child);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> +
> + err = ext2fs_read_inode_full(fs, child, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out2;
> + }
> +
> + inode.i_uid = ctxt->uid;
> + inode.i_gid = ctxt->gid;
> + inode.i_generation = ff->next_generation++;
> +
> + err = ext2fs_write_inode_full(fs, child, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out2;
> + }
> +out2:
> + pthread_mutex_unlock(&ff->bfl);
> +out:
> + free(temp_path);
> + return ret;
> +}
> +
> +static int op_rename(const char *from, const char *to)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> + ext2_ino_t from_ino, to_ino, to_dir_ino, from_dir_ino;
> + char *temp_to = NULL, *temp_from = NULL;
> + char *cp, a;
> + struct ext2_inode from_inode;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, from, &from_ino);
> + if (err || from_ino == 0) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, to, &to_ino);
> + if (err && err != EXT2_ET_FILE_NOT_FOUND) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + if (err == EXT2_ET_FILE_NOT_FOUND)
> + to_ino = 0;
> +
> + /* Already the same file? */
> + if (to_ino != 0 && to_ino == from_ino) {
> + ret = 0;
> + goto out;
> + }
> +
> + temp_to = strdup(to);
> + if (!temp_to) {
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> + temp_from = strdup(from);
> + if (!temp_from) {
> + ret = -ENOMEM;
> + goto out2;
> + }
> +
> + /* Find parent dir of the source and check write access */
> + cp = strrchr(temp_from, '/');
> + if (!cp) {
> + ret = -EINVAL;
> + goto out2;
> + }
> +
> + a = *(cp + 1);
> + *(cp + 1) = 0;
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_from,
> + &from_dir_ino);
> + *(cp + 1) = a;
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> + if (from_dir_ino == 0) {
> + ret = -ENOENT;
> + goto out2;
> + }
> +
> + ret = check_inum_access(ctxt, fs, from_dir_ino, W_OK);
> + if (ret)
> + goto out2;
> +
> + /* Find parent dir of the destination and check write access */
> + cp = strrchr(temp_to, '/');
> + if (!cp) {
> + ret = -EINVAL;
> + goto out2;
> + }
> +
> + a = *(cp + 1);
> + *(cp + 1) = 0;
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_to,
> + &to_dir_ino);
> + *(cp + 1) = a;
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> + if (to_dir_ino == 0) {
> + ret = -ENOENT;
> + goto out2;
> + }
> +
> + ret = check_inum_access(ctxt, fs, to_dir_ino, W_OK);
> + if (ret)
> + goto out2;
> +
> + /* Get ready to do the move */
> + err = ext2fs_read_inode(fs, from_ino, &from_inode);
> + if (err) {
> + ret = translate_error(fs, from_ino, err);
> + goto out2;
> + }
> +
> + /* If the target exists, unlink it first */
> + if (to_ino != 0) {
> + ret = __op_unlink(to);
> + if (ret)
> + goto out2;
> + }
> +
> + /* Link in the new file */
> + err = ext2fs_link(fs, to_dir_ino, cp + 1, from_ino,
> + ext2_file_type(from_inode.i_mode));
> + if (err == EXT2_ET_DIR_NO_SPACE) {
> + err = ext2fs_expand_dir(fs, to_dir_ino);
> + if (err) {
> + ret = translate_error(fs, to_dir_ino, err);
> + goto out2;
> + }
> +
> + err = ext2fs_link(fs, to_dir_ino, cp + 1, from_ino,
> + ext2_file_type(from_inode.i_mode));
> + }
> + if (err) {
> + ret = translate_error(fs, to_dir_ino, err);
> + goto out2;
> + }
> +
> + ret = update_mtime(fs, to_dir_ino);
> + if (ret)
> + goto out2;
> +
> + /* Remove the old file */
> + ret = unlink_file_by_name(ctxt, fs, from);
> + if (ret)
> + goto out2;
> +
> + /* Flush the whole mess out */
> + err = ext2fs_flush2(fs, 0);
> + if (err)
> + ret = translate_error(fs, 0, err);
> +
> +out2:
> + free(temp_from);
> + free(temp_to);
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +static int op_link(const char *src, const char *dest)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + char *temp_path = strdup(dest);
> + errcode_t err;
> + char *node_name, a;
> + ext2_ino_t parent, ino;
> + struct ext2_inode_large inode;
> + int ret = 0;
> +
> + if (!temp_path) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name = strrchr(temp_path, '/');
> + if (!node_name) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name++;
> + a = *node_name;
> + *node_name = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_path,
> + &parent);
> + *node_name = a;
> + if (err) {
> + err = -ENOENT;
> + goto out2;
> + }
> +
> + ret = check_inum_access(ctxt, fs, parent, W_OK);
> + if (ret)
> + goto out2;
> +
> +
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, src, &ino);
> + if (err || ino == 0) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> +
> + err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + inode.i_links_count++;
> + ret = update_ctime(fs, ino, &inode);
> + if (ret)
> + goto out2;
> +
> + err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + err = ext2fs_link(fs, parent, node_name, ino,
> + ext2_file_type(inode.i_mode));
> + if (err == EXT2_ET_DIR_NO_SPACE) {
> + err = ext2fs_expand_dir(fs, parent);
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + err = ext2fs_link(fs, parent, node_name, ino,
> + ext2_file_type(inode.i_mode));
> + }
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + ret = update_mtime(fs, parent);
> + if (ret)
> + goto out;
> +
> +out2:
> + pthread_mutex_unlock(&ff->bfl);
> +out:
> + free(temp_path);
> + return ret;
> +}
> +
> +static int op_chmod(const char *path, mode_t mode)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> + ext2_ino_t ino;
> + struct ext2_inode_large inode;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + /* XXX: Fails if uid matches but u-w */
> + ret = check_inum_access(ctxt, fs, ino, W_OK);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + inode.i_mode &= ~0xFFF;
> + inode.i_mode |= mode & 0xFFF;
> + ret = update_ctime(fs, ino, &inode);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +static int op_chown(const char *path, uid_t owner, gid_t group)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> + ext2_ino_t ino;
> + struct ext2_inode_large inode;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, ino, W_OK);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + inode.i_uid = owner;
> + inode.i_gid = group;
> + ret = update_ctime(fs, ino, &inode);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +static int op_truncate(const char *path, off_t len)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> + ext2_ino_t ino;
> + ext2_file_t file;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err || ino == 0) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, ino, W_OK);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_file_open(fs, ino, EXT2_FILE_WRITE, &file);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_set_size2(file, len);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> +out2:
> + err = ext2fs_file_close(file);
> + if (err && !ret) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + if (!ret)
> + ret = update_mtime(fs, ino);
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return err;
> +}
> +
> +static int __op_open(const char *path, struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> + ext2_ino_t ino;
> + struct fuse2fs_file_handle *file;
> + int check, ret = 0;
> +
> + file = calloc(1, sizeof(*file));
> + if (!file)
> + return -ENOMEM;
> +
> + file->open_flags = 0;
> + if (fp->flags & (O_RDWR | O_WRONLY))
> + file->open_flags |= EXT2_FILE_WRITE;
> + if (fp->flags & O_CREAT)
> + file->open_flags |= EXT2_FILE_CREATE;
> +
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &file->ino);
> + if (err || file->ino == 0) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + check = R_OK;
> + if (file->open_flags & EXT2_FILE_WRITE)
> + check |= W_OK;
> + ret = check_inum_access(ctxt, fs, file->ino, check);
> + if (ret)
> + goto out;
> + fp->fh = (uint64_t)file;
> +
> +out:
> + if (ret)
> + free(file);
> + return ret;
> +}
> +
> +static int op_open(const char *path, struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + int ret;
> +
> + pthread_mutex_lock(&ff->bfl);
> + ret = __op_open(path, fp);
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +static int op_read(const char *path, char *buf, size_t len, off_t offset,
> + struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + ext2_file_t efp;
> + errcode_t err;
> + unsigned int got;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_file_open(fs, fh->ino, fh->open_flags, &efp);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_llseek(efp, offset, SEEK_SET, NULL);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_read(efp, buf, len, &got);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_close(efp);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + if (fs_writeable(fs)) {
> + ret = update_atime(fs, fh->ino);
> + if (ret)
> + goto out;
> + }
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return got ? got : ret;
> +}
> +
> +static int op_write(const char *path, const char *buf, size_t len, off_t offset,
> + struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + ext2_file_t efp;
> + errcode_t err;
> + unsigned int got;
> + __u64 fsize;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + if (!fs_writeable(fs)) {
> + ret = -EROFS;
> + goto out;
> + }
> +
> + err = ext2fs_file_open(fs, fh->ino, fh->open_flags, &efp);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_llseek(efp, offset, SEEK_SET, NULL);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_write(efp, buf, len, &got);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_flush(efp);
> + if (err) {
> + got = 0;
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + /*
> + * Apparently ext2fs_file_write will dirty the inode (to allocate
> + * blocks) without bothering to write out the inode, so change the
> + * file size *after* the write, because changing the size forces
> + * the inode out to disk.
> + */
> + err = ext2fs_file_get_lsize(efp, &fsize);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> + if (offset + len > fsize) {
> + fsize = offset + len;
> + err = ext2fs_file_set_size2(efp, fsize);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> + }
> +
> + err = ext2fs_file_close(efp);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + ret = update_mtime(fs, fh->ino);
> + if (ret)
> + goto out;
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return got ? got : ret;
> +}
> +
> +static int op_release(const char *path, struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + errcode_t err;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + if (fs_writeable(fs) && fh->open_flags & EXT2_FILE_WRITE) {
> + err = ext2fs_flush2(fs, EXT2_FLAG_FLUSH_NO_SYNC);
> + if (err)
> + ret = translate_error(fs, fh->ino, err);
> + }
> + fp->fh = 0;
> + pthread_mutex_unlock(&ff->bfl);
> +
> + free(fh);
> +
> + return ret;
> +}
> +
> +static int op_fsync(const char *path, int datasync, struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + errcode_t err;
> + int ret = 0;
> +
> + /* For now, flush everything, even if it's slow */
> + pthread_mutex_lock(&ff->bfl);
> + if (fs_writeable(fs) && fh->open_flags & EXT2_FILE_WRITE) {
> + err = ext2fs_flush2(fs, 0);
> + if (err)
> + ret = translate_error(fs, fh->ino, err);
> + }
> + pthread_mutex_unlock(&ff->bfl);
> +
> + return ret;
> +}
> +
> +static int op_statfs(const char *path, struct statvfs *buf)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + uint64_t fsid, *f;
> +
> + buf->f_bsize = fs->blocksize;
> + buf->f_frsize = 0;
> + buf->f_blocks = fs->super->s_blocks_count;
> + buf->f_bfree = fs->super->s_free_blocks_count;
> + if (fs->super->s_free_blocks_count < fs->super->s_r_blocks_count)
> + buf->f_bavail = 0;
> + else
> + buf->f_bavail = fs->super->s_free_blocks_count -
> + fs->super->s_r_blocks_count;
> + buf->f_files = fs->super->s_inodes_count;
> + buf->f_ffree = fs->super->s_free_inodes_count;
> + buf->f_favail = fs->super->s_free_inodes_count;
> + f = (uint64_t *)fs->super->s_uuid;
> + fsid = *f;
> + f++;
> + fsid ^= *f;
> + buf->f_fsid = fsid;
> + buf->f_flag = 0;
> + if (fs->flags & EXT2_FLAG_RW)
> + buf->f_flag |= ST_RDONLY;
> + buf->f_namemax = EXT2_NAME_LEN;
> +
> + return 0;
> +}
> +
> +static int op_getxattr(const char *path, const char *key, char *value,
> + size_t len)
> +{
As a general note, these functions do not perform the translation that ext4.ko
provides. Therefore, the ext4 ACL structure is being fed back into the kernel
via fuse, even though the kernel itself uses a different (slightly bulkier)
data structure. It is necessary to provide a translation layer to and from the
native format, though that might be tricky on non-Linux platforms.
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct ext2_xattr_handle *h;
> + void *ptr;
> + unsigned int plen;
> + ext2_ino_t ino;
> + errcode_t err;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + if (!EXT2_HAS_COMPAT_FEATURE(fs->super,
> + EXT2_FEATURE_COMPAT_EXT_ATTR)) {
> + ret = -ENOTSUP;
> + goto out;
> + }
> +
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err || ino == 0) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, ino, R_OK);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_xattrs_open(fs, ino, &h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_xattrs_read(h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + err = ext2fs_xattr_get(h, key, &ptr, &plen);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + if (!len) {
> + ret = plen;
> + } else if (len < plen) {
> + ret = -ERANGE;
> + } else {
> + memcpy(value, ptr, plen);
> + ret = plen;
> + }
> +
> + ext2fs_free_mem(&ptr);
> +out2:
> + err = ext2fs_xattrs_close(&h);
> + if (err)
> + ret = translate_error(fs, ino, err);
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> +
> + return ret;
> +}
> +
> +static int count_buffer_space(char *name, char *value, void *data)
> +{
> + unsigned int *x = data;
> +
> + *x = *x + strlen(name) + 1;
> + return 0;
> +}
> +
> +static int copy_names(char *name, char *value, void *data)
> +{
> + char **b = data;
> +
> + strncpy(*b, name, strlen(name));
> + *b = *b + strlen(name) + 1;
> +
> + return 0;
> +}
> +
> +static int op_listxattr(const char *path, char *names, size_t len)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct ext2_xattr_handle *h;
> + unsigned int bufsz;
> + ext2_ino_t ino;
> + errcode_t err;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + if (!EXT2_HAS_COMPAT_FEATURE(fs->super,
> + EXT2_FEATURE_COMPAT_EXT_ATTR)) {
> + ret = -ENOTSUP;
> + goto out;
> + }
> +
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err || ino == 0) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, ino, R_OK);
> + if (ret)
> + goto out2;
> +
> + err = ext2fs_xattrs_open(fs, ino, &h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_xattrs_read(h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + /* Count buffer space needed for names */
> + bufsz = 0;
> + err = ext2fs_xattrs_iterate(h, count_buffer_space, &bufsz);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + if (len == 0) {
> + ret = bufsz;
> + goto out2;
> + } else if (len < bufsz) {
> + ret = -ERANGE;
> + goto out2;
> + }
> +
> + /* Copy names out */
> + memset(names, 0, len);
> + err = ext2fs_xattrs_iterate(h, copy_names, &names);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> + ret = bufsz;
> +out2:
> + err = ext2fs_xattrs_close(&h);
> + if (err)
> + ret = translate_error(fs, ino, err);
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> +
> + return ret;
> +}
> +
> +static int op_setxattr(const char *path, const char *key, const char *value,
> + size_t len, int flags)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct ext2_xattr_handle *h;
> + ext2_ino_t ino;
> + errcode_t err;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + if (!EXT2_HAS_COMPAT_FEATURE(fs->super,
> + EXT2_FEATURE_COMPAT_EXT_ATTR)) {
> + ret = -ENOTSUP;
> + goto out;
> + }
> +
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err || ino == 0) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, ino, W_OK);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_xattrs_open(fs, ino, &h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_xattrs_read(h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + err = ext2fs_xattr_set(h, key, value, len);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + err = ext2fs_xattrs_write(h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> +out2:
> + err = ext2fs_xattrs_close(&h);
> + if (err)
> + ret = translate_error(fs, ino, err);
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> +
> + return ret;
> +}
> +
> +static int op_removexattr(const char *path, const char *key)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct ext2_xattr_handle *h;
> + ext2_ino_t ino;
> + errcode_t err;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + if (!EXT2_HAS_COMPAT_FEATURE(fs->super,
> + EXT2_FEATURE_COMPAT_EXT_ATTR)) {
> + ret = -ENOTSUP;
> + goto out;
> + }
> +
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err || ino == 0) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, ino, W_OK);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_xattrs_open(fs, ino, &h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_xattrs_read(h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + err = ext2fs_xattr_remove(h, key);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> + err = ext2fs_xattrs_write(h);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out2;
> + }
> +
> +out2:
> + err = ext2fs_xattrs_close(&h);
> + if (err)
> + ret = translate_error(fs, ino, err);
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> +
> + return ret;
> +}
> +
> +struct readdir_iter {
> + void *buf;
> + fuse_fill_dir_t func;
> +};
> +
> +static int op_readdir_iter(ext2_ino_t dir, int entry,
> + struct ext2_dir_entry *dirent, int offset,
> + int blocksize, char *buf, void *data)
> +{
> + struct readdir_iter *i = data;
> + struct stat statbuf;
> + char namebuf[EXT2_NAME_LEN + 1];
> + int ret;
> +
> + memcpy(namebuf, dirent->name, dirent->name_len & 0xFF);
> + namebuf[dirent->name_len & 0xFF] = 0;
> + statbuf.st_ino = dirent->inode;
> + statbuf.st_mode = S_IFREG;
> + ret = i->func(i->buf, namebuf, NULL, 0);
> + if (ret)
> + return DIRENT_ABORT;
> +
> + return 0;
> +}
> +
> +static int op_readdir(const char *path, void *buf, fuse_fill_dir_t fill_func,
> + off_t offset, struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + errcode_t err;
> + ext2_ino_t ino;
> + struct readdir_iter i;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + i.buf = buf;
> + i.func = fill_func;
> + err = ext2fs_dir_iterate2(fs, fh->ino, 0, NULL, op_readdir_iter, &i);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + if (fs_writeable(fs)) {
> + ret = update_atime(fs, fh->ino);
> + if (ret)
> + goto out;
> + }
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +static int op_access(const char *path, int mask)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> + ext2_ino_t ino;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err || ino == 0) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, ino, mask);
> + if (ret)
> + goto out;
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +static int op_create(const char *path, mode_t mode, struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct ext3_extent_header *eh;
> + ext2_ino_t parent, child;
> + char *temp_path = strdup(path);
> + errcode_t err;
> + char *node_name, a;
> + int filetype, i;
> + struct ext2_inode_large inode;
> + int ret = 0;
> +
> + if (!temp_path) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name = strrchr(temp_path, '/');
> + if (!node_name) {
> + ret = -ENOMEM;
> + goto out;
> + }
> + node_name++;
> + a = *node_name;
> + *node_name = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, temp_path,
> + &parent);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out2;
> + }
> +
> + err = check_inum_access(ctxt, fs, parent, W_OK);
> + if (err)
> + goto out;
> +
> + *node_name = a;
> +
> + filetype = ext2_file_type(mode);
> +
> + err = ext2fs_new_inode(fs, parent, mode, 0, &child);
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + err = ext2fs_link(fs, parent, node_name, child, filetype);
> + if (err == EXT2_ET_DIR_NO_SPACE) {
> + err = ext2fs_expand_dir(fs, parent);
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + err = ext2fs_link(fs, parent, node_name, child,
> + filetype);
> + }
> + if (err) {
> + ret = translate_error(fs, parent, err);
> + goto out2;
> + }
> +
> + ret = update_mtime(fs, parent);
> + if (ret)
> + goto out2;
> +
> + memset(&inode, 0, sizeof(inode));
> + inode.i_mode = mode;
> + inode.i_links_count = 1;
> + inode.i_extra_isize = sizeof(struct ext2_inode_large) -
> + EXT2_GOOD_OLD_INODE_SIZE;
> + if (fs->super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_EXTENTS) {
> + inode.i_flags = EXT4_EXTENTS_FL;
> +
> + /* This must be initialized, even for a zero byte file. */
> + eh = (struct ext3_extent_header *) &inode.i_block[0];
> + eh->eh_magic = ext2fs_cpu_to_le16(EXT3_EXT_MAGIC);
> + eh->eh_depth = 0;
> + eh->eh_entries = 0;
> + i = (sizeof(inode.i_block) - sizeof(*eh)) /
> + sizeof(struct ext3_extent);
> + eh->eh_max = ext2fs_cpu_to_le16(i);
> + }
> +
> + err = ext2fs_write_new_inode(fs, child, (struct ext2_inode *)&inode);
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out2;
> + }
> +
> + inode.i_generation = ff->next_generation++;
> + init_times(&inode);
> + err = ext2fs_write_inode_full(fs, child, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, child, err);
> + goto out2;
> + }
> +
> + ext2fs_inode_alloc_stats2(fs, child, 1, 0);
> +
> + ret = __op_open(path, fp);
> + if (ret)
> + goto out2;
> +out2:
> + pthread_mutex_unlock(&ff->bfl);
> +out:
> + free(temp_path);
> + return ret;
> +}
> +
> +static int op_ftruncate(const char *path, off_t len, struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + ext2_file_t efp;
> + errcode_t err;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + if (!fs_writeable(fs)) {
> + ret = -EROFS;
> + goto out;
> + }
> +
> + err = ext2fs_file_open(fs, fh->ino, fh->open_flags, &efp);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_set_size2(efp, len);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + err = ext2fs_file_close(efp);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out;
> + }
> +
> + ret = update_mtime(fs, fh->ino);
> + if (ret)
> + goto out;
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return 0;
> +}
> +
> +static int op_fgetattr(const char *path, struct stat *statbuf,
> + struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + ret = stat_inode(fs, fh->ino, statbuf);
> + pthread_mutex_unlock(&ff->bfl);
> +
> + return ret;
> +}
> +
> +static int op_utimens(const char *path, const struct timespec tv[2])
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + errcode_t err;
> + ext2_ino_t ino;
> + struct ext2_inode_large inode;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + ret = check_inum_access(ctxt, fs, ino, W_OK);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> + EXT4_INODE_SET_XTIME(i_atime, tv, &inode);
> + EXT4_INODE_SET_XTIME(i_mtime, tv + 1, &inode);
> + ret = update_ctime(fs, ino, &inode);
> + if (ret)
> + goto out;
> +
> + err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return 0;
> +}
> +
> +#ifdef SUPPORT_I_FLAGS
> +static int ioctl_getflags(ext2_filsys fs, struct fuse2fs_file_handle *fh,
> + void *data)
> +{
> + errcode_t err;
> + struct ext2_inode_large inode;
> +
> + err = ext2fs_read_inode_full(fs, fh->ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err)
> + return -EIO;
> +
> + *(__u32 *)data = inode.i_flags & EXT2_FL_USER_VISIBLE;
> + return 0;
> +}
> +
> +#define FUSE2FS_MODIFIABLE_IFLAGS \
> + (EXT2_IMMUTABLE_FL | EXT2_APPEND_FL | EXT2_NODUMP_FL | \
> + EXT2_NOATIME_FL | EXT3_JOURNAL_DATA_FL | EXT2_DIRSYNC_FL | \
> + EXT2_TOPDIR_FL)
> +
> +int ioctl_setflags(ext2_filsys fs, struct fuse2fs_file_handle *fh, void *data)
This can be static.
> +{
> + errcode_t err;
> + struct ext2_inode_large inode;
> + int ret;
> + __u32 flags = *(__u32 *)data;
> + struct fuse_context *ctxt = fuse_get_context();
> +
> + ret = check_flags_access(ctxt, fs, fh->ino, W_OK);
> + if (ret)
> + return ret;
> +
> + err = ext2fs_read_inode_full(fs, fh->ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err)
> + return -EIO;
> +
> + if ((inode.i_flags ^ flags) & ~FUSE2FS_MODIFIABLE_IFLAGS)
> + return -EINVAL;
> +
> + inode.i_flags = inode.i_flags & ~FUSE2FS_MODIFIABLE_IFLAGS |
> + flags & FUSE2FS_MODIFIABLE_IFLAGS;
> +
> + err = ext2fs_write_inode_full(fs, fh->ino, (struct ext2_inode *)&inode,
> + sizeof(inode));
> + if (err)
> + return -EIO;
> +
> + return 0;
> +}
> +#endif /* SUPPORT_I_FLAGS */
> +
> +#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
> +static int op_ioctl(const char *path, int cmd, void *arg,
> + struct fuse_file_info *fp, unsigned int flags, void *data)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + switch (cmd) {
> +#ifdef SUPPORT_I_FLAGS
> + case EXT2_IOC_GETFLAGS:
> + ret = ioctl_getflags(fs, fh, data);
> + break;
> + case EXT2_IOC_SETFLAGS:
> + ret = ioctl_setflags(fs, fh, data);
> + break;
> +#endif
> + default:
> + ret = -ENOTTY;
> + }
> + pthread_mutex_unlock(&ff->bfl);
> +
> + return ret;
> +}
> +#endif /* FUSE 28 */
> +
> +static int op_bmap(const char *path, size_t blocksize, uint64_t *idx)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + ext2_ino_t ino;
> + errcode_t err;
> + int ret = 0;
> +
> + pthread_mutex_lock(&ff->bfl);
> + err = ext2fs_namei(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, path, &ino);
> + if (err) {
> + ret = translate_error(fs, 0, err);
> + goto out;
> + }
> +
> + err = ext2fs_bmap2(fs, ino, NULL, NULL, 0, *idx, 0, (blk64_t *)idx);
> + if (err) {
> + ret = translate_error(fs, ino, err);
> + goto out;
> + }
> +
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> + return ret;
> +}
> +
> +#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
> +static int fallocate_helper(struct fuse_file_info *fp, int mode, off_t offset,
> + off_t len)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + blk64_t blk, end, x;
> + __u64 fsize;
> + ext2_file_t efp;
> + struct ext2_inode_large inode;
Unused variable.
> + errcode_t err;
> + int ret = 0;
> +
> + /* Allocate a bunch of blocks */
> + end = (offset + len - 1) / fs->blocksize;
> + for (blk = offset / fs->blocksize; blk <= end; blk++) {
> + err = ext2fs_bmap2(fs, fh->ino, NULL, NULL, BMAP_ALLOC, blk,
> + 0, &x);
> + if (err)
> + return translate_error(fs, fh->ino, err);
> + }
> +
> + /* Update i_size */
> + if (!(mode & FL_KEEP_SIZE_FLAG)) {
> + err = ext2fs_file_open(fs, fh->ino, fh->open_flags, &efp);
> + if (err)
> + return translate_error(fs, fh->ino, err);
> +
> + err = ext2fs_file_get_lsize(efp, &fsize);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out_isize;
> + }
> + if (offset + len > fsize) {
> + fsize = offset + len;
> + err = ext2fs_file_set_size2(efp, fsize);
> + if (err) {
> + ret = translate_error(fs, fh->ino, err);
> + goto out_isize;
> + }
> + }
> +
> +out_isize:
> + err = ext2fs_file_close(efp);
> + if (ret)
> + return ret;
> + if (err)
> + return translate_error(fs, fh->ino, err);
> + }
> +
> + return update_mtime(fs, fh->ino);
> +}
> +
> +static int punch_helper(struct fuse_file_info *fp, int mode, off_t offset,
> + off_t len)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + struct fuse2fs_file_handle *fh = (struct fuse2fs_file_handle *)fp->fh;
> + blk64_t blk, start, end, x;
> + __u64 fsize;
> + ext2_file_t efp;
> + struct ext2_inode_large inode;
Unused variable.
All of these problems are fixed in my dev tree, of course. :)
--D
> + errcode_t err;
> + int ret = 0;
> +
> + /* kernel ext4 punch requires this flag to be set */
> + if (!(mode & FL_KEEP_SIZE_FLAG))
> + return -EINVAL;
> +
> + if (len < fs->blocksize)
> + return 0;
> +
> + /* Punch out a bunch of blocks */
> + start = (offset + fs->blocksize - 1) / fs->blocksize;
> + end = (offset + len - fs->blocksize) / fs->blocksize;
> +
> + if (start > end)
> + return -EINVAL;
> +
> + err = ext2fs_punch(fs, fh->ino, NULL, NULL, start, end);
> + if (err)
> + return translate_error(fs, fh->ino, err);
> +
> + return update_mtime(fs, fh->ino);
> +}
> +
> +static int op_fallocate(const char *path, int mode, off_t offset, off_t len,
> + struct fuse_file_info *fp)
> +{
> + struct fuse_context *ctxt = fuse_get_context();
> + struct fuse2fs *ff = (struct fuse2fs *)ctxt->private_data;
> + ext2_filsys fs = ff->fs;
> + int ret;
> +
> + /* Catch unknown flags */
> + if (mode & ~(FL_PUNCH_HOLE_FLAG | FL_KEEP_SIZE_FLAG))
> + return -EINVAL;
> +
> + pthread_mutex_lock(&ff->bfl);
> + if (!fs_writeable(fs)) {
> + ret = -EROFS;
> + goto out;
> + }
> + if (mode & FL_PUNCH_HOLE_FLAG)
> + ret = punch_helper(fp, mode, offset, len);
> + else
> + ret = fallocate_helper(fp, mode, offset, len);
> +out:
> + pthread_mutex_unlock(&ff->bfl);
> +
> + return ret;
> +}
> +#endif /* FUSE 29 */
> +
> +static struct fuse_operations fs_ops = {
> + .init = op_init,
> + .destroy = op_destroy,
> + .getattr = op_getattr,
> + .readlink = op_readlink,
> + .mknod = op_mknod,
> + .mkdir = op_mkdir,
> + .unlink = op_unlink,
> + .rmdir = op_rmdir,
> + .symlink = op_symlink,
> + .rename = op_rename,
> + .link = op_link,
> + .chmod = op_chmod,
> + .chown = op_chown,
> + .truncate = op_truncate,
> + .open = op_open,
> + .read = op_read,
> + .write = op_write,
> + .statfs = op_statfs,
> + .release = op_release,
> + .fsync = op_fsync,
> + .setxattr = op_setxattr,
> + .getxattr = op_getxattr,
> + .listxattr = op_listxattr,
> + .removexattr = op_removexattr,
> + .opendir = op_open,
> + .readdir = op_readdir,
> + .releasedir = op_release,
> + .fsyncdir = op_fsync,
> + .access = op_access,
> + .create = op_create,
> + .ftruncate = op_ftruncate,
> + .fgetattr = op_fgetattr,
> + .utimens = op_utimens,
> + .bmap = op_bmap,
> +#ifdef SUPERFLUOUS
> + .lock = op_lock,
> + .poll = op_poll,
> +#endif
> +#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 8)
> + .ioctl = op_ioctl,
> + .flag_nullpath_ok = 1,
> +#endif
> +#if FUSE_VERSION >= FUSE_MAKE_VERSION(2, 9)
> + .flag_nopath = 1,
> + .fallocate = op_fallocate,
> +#endif
> +};
> +
> +static int get_random_bytes(void *p, size_t sz)
> +{
> + int fd;
> + ssize_t r;
> +
> + fd = open("/dev/random", O_RDONLY);
> + if (fd < 0) {
> + perror("/dev/random");
> + return 0;
> + }
> +
> + r = read(fd, p, sz);
> +
> + close(fd);
> + return r == sz;
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + errcode_t err;
> + ext2_filsys fs;
> + char *tok, *arg, *logfile;
> + int i;
> + int readwrite = 1, panic_on_error = 0;
> + struct fuse2fs *ff;
> + char extra_args[BUFSIZ];
> + int ret = 0, flags = EXT2_FLAG_64BITS | EXT2_FLAG_EXCLUSIVE;
> +
> + if (argc < 2) {
> + printf("Usage: %s dev mntpt [-o options] [fuse_args]\n",
> + argv[0]);
> + return 1;
> + }
> +
> + for (i = 1; i < argc - 1; i++) {
> + if (strcmp(argv[i], "-o"))
> + continue;
> + arg = argv[i + 1];
> + while ((tok = strtok(arg, ","))) {
> + arg = NULL;
> + if (!strcmp(tok, "ro"))
> + readwrite = 0;
> + else if (!strcmp(tok, "errors=panic"))
> + panic_on_error = 1;
> + }
> + }
> +
> + if (!readwrite)
> + printf("Mounting read-only.\n");
> +
> +#ifdef ENABLE_NLS
> + setlocale(LC_MESSAGES, "");
> + setlocale(LC_CTYPE, "");
> + bindtextdomain(NLS_CAT_NAME, LOCALEDIR);
> + textdomain(NLS_CAT_NAME);
> + set_com_err_gettext(gettext);
> +#endif
> + add_error_table(&et_ext2_error_table);
> +
> + ff = calloc(1, sizeof(*ff));
> + if (!ff) {
> + perror("init");
> + return 1;
> + }
> + ff->panic_on_error = panic_on_error;
> +
> + /* Set up error logging */
> + logfile = getenv("FUSE2FS_LOGFILE");
> + if (logfile) {
> + ff->err_fp = fopen(logfile, "a");
> + if (!ff->err_fp) {
> + perror(logfile);
> + goto out_nofs;
> + }
> + } else
> + ff->err_fp = stderr;
> +
> + /* Start up the fs (while we still can use stdout) */
> + ret = 2;
> + if (readwrite)
> + flags |= EXT2_FLAG_RW;
> + err = ext2fs_open3(argv[1], NULL, flags, 0, 0, unix_io_manager, &fs);
> + if (err) {
> + printf("%s: %s.\n", argv[1], error_message(err));
> + printf("Please run e2fsck -fy %s.\n", argv[1]);
> + goto out_nofs;
> + }
> + ff->fs = fs;
> + fs->priv_data = ff;
> +
> + ret = 3;
> + if (EXT2_HAS_INCOMPAT_FEATURE(fs->super,
> + EXT3_FEATURE_INCOMPAT_RECOVER)) {
> + printf("Journal needs recovery; running `e2fsck -E "
> + "journal_only' is required.\n");
> + goto out;
> + }
> +
> + if (readwrite) {
> + if (EXT2_HAS_COMPAT_FEATURE(fs->super,
> + EXT3_FEATURE_COMPAT_HAS_JOURNAL))
> + printf("Journal mode will not be used.\n");
> + err = ext2fs_read_inode_bitmap(fs);
> + if (err) {
> + translate_error(fs, 0, err);
> + goto out;
> + }
> + err = ext2fs_read_block_bitmap(fs);
> + if (err) {
> + translate_error(fs, 0, err);
> + goto out;
> + }
> + }
> +
> + if (!(fs->super->s_state & EXT2_VALID_FS))
> + printf("Warning: Mounting unchecked fs, running e2fsck "
> + "is recommended.\n");
> + if (fs->super->s_max_mnt_count > 0 &&
> + fs->super->s_mnt_count >= fs->super->s_max_mnt_count)
> + printf("Warning: Maximal mount count reached, running "
> + "e2fsck is recommended.\n");
> + if (fs->super->s_checkinterval > 0 &&
> + fs->super->s_lastcheck + fs->super->s_checkinterval <= time(0))
> + printf("Warning: Check time reached; running e2fsck "
> + "is recommended.\n");
> + if (fs->super->s_last_orphan)
> + printf("Orphans detected; running e2fsck is recommended.\n");
> +
> + if (fs->super->s_state & EXT2_ERROR_FS) {
> + printf("Errors detected; running e2fsck is required.\n");
> + goto out;
> + }
> +
> + /* Initialize generation counter */
> + get_random_bytes(&ff->next_generation, sizeof(unsigned int));
> +
> + /* Stuff in some fuse parameters of our own */
> + snprintf(extra_args, BUFSIZ, "-okernel_cache,subtype=ext4,use_ino,"
> + "fsname=%s", argv[1]);
> + argv[0] = argv[1];
> + argv[1] = argv[2];
> + argv[2] = extra_args;
> +
> + pthread_mutex_init(&ff->bfl, NULL);
> + fuse_main(argc, argv, &fs_ops, ff);
> + pthread_mutex_destroy(&ff->bfl);
> +
> + ret = 0;
> +out:
> + err = ext2fs_close(fs);
> + if (err)
> + ret = translate_error(fs, 0, err);
> +out_nofs:
> + free(ff);
> +
> + return ret;
> +}
> +
> +static int __translate_error(ext2_filsys fs, errcode_t err, ext2_ino_t ino,
> + const char *file, int line)
> +{
> + struct timespec now;
> + int ret;
> + struct fuse2fs *ff = fs->priv_data;
> + int is_err = 0;
> +
> + /* Translate ext2 error to unix error code */
> + switch (err) {
> + case EXT2_ET_NO_MEMORY:
> + case EXT2_ET_TDB_ERR_OOM:
> + ret = -ENOMEM;
> + break;
> + case EXT2_ET_INVALID_ARGUMENT:
> + case EXT2_ET_LLSEEK_FAILED:
> + ret = -EINVAL;
> + break;
> + case EXT2_ET_NO_DIRECTORY:
> + ret = -ENOTDIR;
> + break;
> + case EXT2_ET_FILE_NOT_FOUND:
> + ret = -ENOENT;
> + break;
> + case EXT2_ET_DIR_NO_SPACE:
> + is_err = 1;
> + case EXT2_ET_TOOSMALL:
> + case EXT2_ET_BLOCK_ALLOC_FAIL:
> + case EXT2_ET_INODE_ALLOC_FAIL:
> + case EXT2_ET_EA_NO_SPACE:
> + ret = -ENOSPC;
> + break;
> + case EXT2_ET_SYMLINK_LOOP:
> + ret = -EMLINK;
> + break;
> + case EXT2_ET_FILE_TOO_BIG:
> + ret = -EFBIG;
> + break;
> + case EXT2_ET_TDB_ERR_EXISTS:
> + case EXT2_ET_FILE_EXISTS:
> + ret = -EEXIST;
> + break;
> + case EXT2_ET_MMP_FAILED:
> + case EXT2_ET_MMP_FSCK_ON:
> + ret = -EBUSY;
> + break;
> + case EXT2_ET_EA_KEY_NOT_FOUND:
> + ret = -ENODATA;
> + break;
> + default:
> + is_err = 1;
> + ret = -EIO;
> + break;
> + }
> +
> + if (!is_err)
> + return ret;
> +
> + if (ino)
> + fprintf(ff->err_fp, "FUSE2FS (%s): %s (inode #%d) at %s:%d.\n",
> + fs && fs->device_name ? fs->device_name : "???",
> + error_message(err), ino, file, line);
> + else
> + fprintf(ff->err_fp, "FUSE2FS (%s): %s at %s:%d.\n",
> + fs && fs->device_name ? fs->device_name : "???",
> + error_message(err), file, line);
> + fflush(ff->err_fp);
> +
> + /* Make a note in the error log */
> + get_now(&now);
> + fs->super->s_last_error_time = now.tv_sec;
> + fs->super->s_last_error_ino = ino;
> + fs->super->s_last_error_line = line;
> + fs->super->s_last_error_block = 0;
> + strncpy(fs->super->s_last_error_func, file,
> + sizeof(fs->super->s_last_error_func));
> + if (fs->super->s_first_error_time == 0) {
> + fs->super->s_first_error_time = now.tv_sec;
> + fs->super->s_first_error_ino = ino;
> + fs->super->s_first_error_line = line;
> + fs->super->s_first_error_block = 0;
> + strncpy(fs->super->s_first_error_func, file,
> + sizeof(fs->super->s_first_error_func));
> + }
> +
> + fs->super->s_error_count++;
> + ext2fs_mark_super_dirty(fs);
> + ext2fs_flush(fs);
> + if (ff->panic_on_error)
> + abort();
> +
> + return ret;
> +}
>
> --
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