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util/nvmutil: simplify i/o

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we can just fall through to nrw and decide
what function ta call there - either read/write
immediately and return, or fall back to the
portable positional implementation.

this also means we don't have to call io_args
in every function, since everything now runs
through prw()

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-13 22:16:09 +00:00
parent 8071d7eaa8
commit 223932c5f8
1 changed files with 13 additions and 37 deletions
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util/nvmutil/nvmutil.c
+13 -37
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@@ -331,8 +331,6 @@ static ssize_t rw_file_exact(int fd, u8 *mem, size_t len,
off_t off, int rw_type);
static ssize_t rw_file_once(int fd, u8 *mem, size_t len,
off_t off, int rw_type, size_t rc);
static ssize_t do_rw(int fd,
u8 *mem, size_t len, off_t off, int rw_type);
static ssize_t prw(int fd, void *mem, size_t nrw,
off_t off, int rw_type);
static off_t lseek_eintr(int fd, off_t off, int whence);
@@ -1595,11 +1593,6 @@ rw_file_exact(int fd, u8 *mem, size_t nrw,
ssize_t rv;
size_t rc;
if (io_args(fd, mem, nrw, off, rw_type) == -1) {
errno = EIO;
return -1;
}
for (rc = 0, rv = 0; rc < nrw; ) {
if ((rv = rw_file_once(fd, mem, nrw, off, rw_type, rc)) <= 0)
return -1;
@@ -1622,11 +1615,8 @@ rw_file_once(int fd, u8 *mem, size_t nrw,
size_t retries_on_zero = 0;
size_t max_retries = 10;
if (io_args(fd, mem, nrw, off, rw_type) == -1)
goto err_rw_file_once;
read_again:
rv = do_rw(fd, mem + rc, nrw - rc, off + rc, rw_type);
rv = prw(fd, mem + rc, nrw - rc, off + rc, rw_type);
if (rv < 0 && errno == EINTR)
goto read_again;
@@ -1649,27 +1639,6 @@ err_rw_file_once:
return -1;
}
static ssize_t
do_rw(int fd, u8 *mem,
size_t nrw, off_t off, int rw_type)
{
if (io_args(fd, mem, nrw, off, rw_type) == -1)
goto err_do_rw;
if (rw_type == IO_READ)
return read(fd, mem, nrw);
if (rw_type == IO_WRITE)
return write(fd, mem, nrw);
if (rw_type == IO_PREAD || rw_type == IO_PWRITE)
return prw(fd, mem, nrw, off, rw_type);
err_do_rw:
errno = EIO;
return -1;
}
/*
* This implements a portable analog of pwrite()
* and pread() - note that this version is not
@@ -1678,6 +1647,10 @@ err_do_rw:
*
* This limitation is acceptable, since nvmutil is
* single-threaded. Portability is the main goal.
*
* A fallback is provided for regular read/write.
* rw_type can be IO_READ, IO_WRITE, IO_PREAD
* or IO_PWRITE
*/
static ssize_t
prw(int fd, void *mem, size_t nrw,
@@ -1686,16 +1659,16 @@ prw(int fd, void *mem, size_t nrw,
off_t off_orig;
ssize_t r;
int saved_errno;
int prw_type;
int flags;
if (io_args(fd, mem, nrw, off, rw_type) == -1)
goto err_prw;
prw_type = rw_type ^ IO_PREAD;
if (rw_type == IO_WRITE)
return write(fd, mem, nrw);
if ((unsigned int)prw_type > IO_WRITE)
goto err_prw;
if (rw_type == IO_READ)
return read(fd, mem, nrw);
flags = fcntl(fd, F_GETFL);
if (flags == -1)
@@ -1717,7 +1690,10 @@ prw(int fd, void *mem, size_t nrw,
return -1;
do {
r = do_rw(fd, mem, nrw, off, prw_type);
if (rw_type == IO_PREAD)
r = read(fd, mem, nrw);
else if (rw_type == IO_PWRITE)
r = write(fd, mem, nrw);
} while (r < 0 && errno == EINTR);
saved_errno = errno;