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sandbox: fs: Add support for saving files to host filesystem

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This allows write of files from the host filesystem in sandbox. There is
currently no concept of overwriting the file and removing its existing
contents - all writing is done on top of what is there. This means that
writing 10 bytes to the start of a 1KB file will only update those 10
bytes, not truncate the file to 10 byte slong.

If the file does not exist it is created.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2013-04-20 08:42:51 +00:00 committed by Tom Rini
parent a8f6ab5229
commit 7eb2c8d573
4 changed files with 49 additions and 4 deletions
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18
common/cmd_sandbox.c
View File

@ -32,9 +32,16 @@ static int do_sandbox_ls(cmd_tbl_t *cmdtp, int flag, int argc,
return do_ls(cmdtp, flag, argc, argv, FS_TYPE_SANDBOX);
}
static int do_sandbox_save(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
{
return do_save(cmdtp, flag, argc, argv, FS_TYPE_SANDBOX, 16);
}
static cmd_tbl_t cmd_sandbox_sub[] = {
U_BOOT_CMD_MKENT(load, 3, 0, do_sandbox_load, "", ""),
U_BOOT_CMD_MKENT(load, 7, 0, do_sandbox_load, "", ""),
U_BOOT_CMD_MKENT(ls, 3, 0, do_sandbox_ls, "", ""),
U_BOOT_CMD_MKENT(save, 6, 0, do_sandbox_save, "", ""),
};
static int do_sandbox(cmd_tbl_t *cmdtp, int flag, int argc,
@ -56,8 +63,11 @@ static int do_sandbox(cmd_tbl_t *cmdtp, int flag, int argc,
}
U_BOOT_CMD(
sb, 6, 1, do_sandbox,
sb, 8, 1, do_sandbox,
"Miscellaneous sandbox commands",
"load host <addr> <filename> [<bytes> <offset>] - load a file from host\n"
"sb ls host <filename> - save a file to host"
"load host <dev> <addr> <filename> [<bytes> <offset>] - "
"load a file from host\n"
"sb ls host <filename> - list files on host\n"
"sb save host <dev> <filename> <addr> <bytes> [<offset>] - "
"save a file to host\n"
);

1
fs/fs.c
View File

@ -93,6 +93,7 @@ static struct fstype_info fstypes[] = {
.close = sandbox_fs_close,
.ls = sandbox_fs_ls,
.read = fs_read_sandbox,
.write = fs_write_sandbox,
},
#endif
{

33
fs/sandbox/sandboxfs.c
View File

@ -48,6 +48,26 @@ long sandbox_fs_read_at(const char *filename, unsigned long pos,
return size;
}
long sandbox_fs_write_at(const char *filename, unsigned long pos,
void *buffer, unsigned long towrite)
{
ssize_t size;
int fd, ret;
fd = os_open(filename, OS_O_RDWR | OS_O_CREAT);
if (fd < 0)
return fd;
ret = os_lseek(fd, pos, OS_SEEK_SET);
if (ret == -1) {
os_close(fd);
return ret;
}
size = os_write(fd, buffer, towrite);
os_close(fd);
return size;
}
int sandbox_fs_ls(const char *dirname)
{
struct os_dirent_node *head, *node;
@ -81,3 +101,16 @@ int fs_read_sandbox(const char *filename, void *buf, int offset, int len)
return len_read;
}
int fs_write_sandbox(const char *filename, void *buf, int offset, int len)
{
int len_written;
len_written = sandbox_fs_write_at(filename, offset, buf, len);
if (len_written == -1) {
printf("** Unable to write file %s **\n", filename);
return -1;
}
return len_written;
}

1
include/sandboxfs.h
View File

@ -26,5 +26,6 @@ long sandbox_fs_read_at(const char *filename, unsigned long pos,
void sandbox_fs_close(void);
int sandbox_fs_ls(const char *dirname);
int fs_read_sandbox(const char *filename, void *buf, int offset, int len);
int fs_write_sandbox(const char *filename, void *buf, int offset, int len);
#endif