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| author | Scott Shawcroft <scott@tannewt.org> | 2019-02-19 14:45:45 -0800 |
|---|---|---|
| committer | Scott Shawcroft <scott@tannewt.org> | 2019-02-21 10:45:41 -0800 |
| commit | 1a0596a2fbb68c1285ec59606d03a610ee94ca47 (patch) | |
| tree | ca91a0b4816a7703afbc98e63f22563d17e5569a /extmod | |
| parent | b1e8c4367987944c3faaad613142fec974840044 (diff) | |
Add option to disable the concurrent write protection
This allows writing to the filesystem from the host computer and
CircuitPython by increasing the risk of filesystem corruption.
Diffstat (limited to 'extmod')
| -rw-r--r-- | extmod/vfs_fat.h | 2 | ||||
| -rw-r--r-- | extmod/vfs_fat_file.c | 3 |
2 files changed, 4 insertions, 1 deletions
diff --git a/extmod/vfs_fat.h b/extmod/vfs_fat.h index dd5e5ffcb..08b03d0d1 100644 --- a/extmod/vfs_fat.h +++ b/extmod/vfs_fat.h @@ -38,6 +38,8 @@ #define FSUSER_NO_FILESYSTEM (0x0008) // the block device has no filesystem on it // Device is writable over USB and read-only to MicroPython. #define FSUSER_USB_WRITABLE (0x0010) +// Bit set when the above flag is checked before opening a file for write. +#define FSUSER_CONCURRENT_WRITE_PROTECTED (0x0020) typedef struct _fs_user_mount_t { mp_obj_base_t base; diff --git a/extmod/vfs_fat_file.c b/extmod/vfs_fat_file.c index 690073ce4..6aad1884c 100644 --- a/extmod/vfs_fat_file.c +++ b/extmod/vfs_fat_file.c @@ -34,6 +34,7 @@ #include "py/mperrno.h" #include "lib/oofatfs/ff.h" #include "extmod/vfs_fat.h" +#include "supervisor/filesystem.h" // this table converts from FRESULT to POSIX errno const byte fresult_to_errno_table[20] = { @@ -187,7 +188,7 @@ STATIC mp_obj_t file_open(fs_user_mount_t *vfs, const mp_obj_type_t *type, mp_ar } } assert(vfs != NULL); - if ((vfs->flags & FSUSER_USB_WRITABLE) != 0 && (mode & FA_WRITE) != 0) { + if ((mode & FA_WRITE) != 0 && !filesystem_is_writable_by_python(vfs)) { mp_raise_OSError(MP_EROFS); } |