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Diffstat (limited to 'fs/read_write.c')
-rw-r--r--fs/read_write.c180
1 files changed, 79 insertions, 101 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index 1adfb691e4f1..d06534857e9e 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -232,23 +232,18 @@ EXPORT_SYMBOL(vfs_llseek);
SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, origin)
{
off_t retval;
- struct file * file;
- int fput_needed;
-
- retval = -EBADF;
- file = fget_light(fd, &fput_needed);
- if (!file)
- goto bad;
+ struct fd f = fdget(fd);
+ if (!f.file)
+ return -EBADF;
retval = -EINVAL;
if (origin <= SEEK_MAX) {
- loff_t res = vfs_llseek(file, offset, origin);
+ loff_t res = vfs_llseek(f.file, offset, origin);
retval = res;
if (res != (loff_t)retval)
retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */
}
- fput_light(file, fput_needed);
-bad:
+ fdput(f);
return retval;
}
@@ -258,20 +253,17 @@ SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
unsigned int, origin)
{
int retval;
- struct file * file;
+ struct fd f = fdget(fd);
loff_t offset;
- int fput_needed;
- retval = -EBADF;
- file = fget_light(fd, &fput_needed);
- if (!file)
- goto bad;
+ if (!f.file)
+ return -EBADF;
retval = -EINVAL;
if (origin > SEEK_MAX)
goto out_putf;
- offset = vfs_llseek(file, ((loff_t) offset_high << 32) | offset_low,
+ offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low,
origin);
retval = (int)offset;
@@ -281,8 +273,7 @@ SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
retval = 0;
}
out_putf:
- fput_light(file, fput_needed);
-bad:
+ fdput(f);
return retval;
}
#endif
@@ -461,34 +452,29 @@ static inline void file_pos_write(struct file *file, loff_t pos)
SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
{
- struct file *file;
+ struct fd f = fdget(fd);
ssize_t ret = -EBADF;
- int fput_needed;
- file = fget_light(fd, &fput_needed);
- if (file) {
- loff_t pos = file_pos_read(file);
- ret = vfs_read(file, buf, count, &pos);
- file_pos_write(file, pos);
- fput_light(file, fput_needed);
+ if (f.file) {
+ loff_t pos = file_pos_read(f.file);
+ ret = vfs_read(f.file, buf, count, &pos);
+ file_pos_write(f.file, pos);
+ fdput(f);
}
-
return ret;
}
SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
size_t, count)
{
- struct file *file;
+ struct fd f = fdget(fd);
ssize_t ret = -EBADF;
- int fput_needed;
- file = fget_light(fd, &fput_needed);
- if (file) {
- loff_t pos = file_pos_read(file);
- ret = vfs_write(file, buf, count, &pos);
- file_pos_write(file, pos);
- fput_light(file, fput_needed);
+ if (f.file) {
+ loff_t pos = file_pos_read(f.file);
+ ret = vfs_write(f.file, buf, count, &pos);
+ file_pos_write(f.file, pos);
+ fdput(f);
}
return ret;
@@ -497,19 +483,18 @@ SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
SYSCALL_DEFINE(pread64)(unsigned int fd, char __user *buf,
size_t count, loff_t pos)
{
- struct file *file;
+ struct fd f;
ssize_t ret = -EBADF;
- int fput_needed;
if (pos < 0)
return -EINVAL;
- file = fget_light(fd, &fput_needed);
- if (file) {
+ f = fdget(fd);
+ if (f.file) {
ret = -ESPIPE;
- if (file->f_mode & FMODE_PREAD)
- ret = vfs_read(file, buf, count, &pos);
- fput_light(file, fput_needed);
+ if (f.file->f_mode & FMODE_PREAD)
+ ret = vfs_read(f.file, buf, count, &pos);
+ fdput(f);
}
return ret;
@@ -526,19 +511,18 @@ SYSCALL_ALIAS(sys_pread64, SyS_pread64);
SYSCALL_DEFINE(pwrite64)(unsigned int fd, const char __user *buf,
size_t count, loff_t pos)
{
- struct file *file;
+ struct fd f;
ssize_t ret = -EBADF;
- int fput_needed;
if (pos < 0)
return -EINVAL;
- file = fget_light(fd, &fput_needed);
- if (file) {
+ f = fdget(fd);
+ if (f.file) {
ret = -ESPIPE;
- if (file->f_mode & FMODE_PWRITE)
- ret = vfs_write(file, buf, count, &pos);
- fput_light(file, fput_needed);
+ if (f.file->f_mode & FMODE_PWRITE)
+ ret = vfs_write(f.file, buf, count, &pos);
+ fdput(f);
}
return ret;
@@ -789,16 +773,14 @@ EXPORT_SYMBOL(vfs_writev);
SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
- struct file *file;
+ struct fd f = fdget(fd);
ssize_t ret = -EBADF;
- int fput_needed;
- file = fget_light(fd, &fput_needed);
- if (file) {
- loff_t pos = file_pos_read(file);
- ret = vfs_readv(file, vec, vlen, &pos);
- file_pos_write(file, pos);
- fput_light(file, fput_needed);
+ if (f.file) {
+ loff_t pos = file_pos_read(f.file);
+ ret = vfs_readv(f.file, vec, vlen, &pos);
+ file_pos_write(f.file, pos);
+ fdput(f);
}
if (ret > 0)
@@ -810,16 +792,14 @@ SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen)
{
- struct file *file;
+ struct fd f = fdget(fd);
ssize_t ret = -EBADF;
- int fput_needed;
- file = fget_light(fd, &fput_needed);
- if (file) {
- loff_t pos = file_pos_read(file);
- ret = vfs_writev(file, vec, vlen, &pos);
- file_pos_write(file, pos);
- fput_light(file, fput_needed);
+ if (f.file) {
+ loff_t pos = file_pos_read(f.file);
+ ret = vfs_writev(f.file, vec, vlen, &pos);
+ file_pos_write(f.file, pos);
+ fdput(f);
}
if (ret > 0)
@@ -838,19 +818,18 @@ SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h)
{
loff_t pos = pos_from_hilo(pos_h, pos_l);
- struct file *file;
+ struct fd f;
ssize_t ret = -EBADF;
- int fput_needed;
if (pos < 0)
return -EINVAL;
- file = fget_light(fd, &fput_needed);
- if (file) {
+ f = fdget(fd);
+ if (f.file) {
ret = -ESPIPE;
- if (file->f_mode & FMODE_PREAD)
- ret = vfs_readv(file, vec, vlen, &pos);
- fput_light(file, fput_needed);
+ if (f.file->f_mode & FMODE_PREAD)
+ ret = vfs_readv(f.file, vec, vlen, &pos);
+ fdput(f);
}
if (ret > 0)
@@ -863,19 +842,18 @@ SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h)
{
loff_t pos = pos_from_hilo(pos_h, pos_l);
- struct file *file;
+ struct fd f;
ssize_t ret = -EBADF;
- int fput_needed;
if (pos < 0)
return -EINVAL;
- file = fget_light(fd, &fput_needed);
- if (file) {
+ f = fdget(fd);
+ if (f.file) {
ret = -ESPIPE;
- if (file->f_mode & FMODE_PWRITE)
- ret = vfs_writev(file, vec, vlen, &pos);
- fput_light(file, fput_needed);
+ if (f.file->f_mode & FMODE_PWRITE)
+ ret = vfs_writev(f.file, vec, vlen, &pos);
+ fdput(f);
}
if (ret > 0)
@@ -884,31 +862,31 @@ SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
return ret;
}
-static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
- size_t count, loff_t max)
+ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, size_t count,
+ loff_t max)
{
- struct file * in_file, * out_file;
- struct inode * in_inode, * out_inode;
+ struct fd in, out;
+ struct inode *in_inode, *out_inode;
loff_t pos;
ssize_t retval;
- int fput_needed_in, fput_needed_out, fl;
+ int fl;
/*
* Get input file, and verify that it is ok..
*/
retval = -EBADF;
- in_file = fget_light(in_fd, &fput_needed_in);
- if (!in_file)
+ in = fdget(in_fd);
+ if (!in.file)
goto out;
- if (!(in_file->f_mode & FMODE_READ))
+ if (!(in.file->f_mode & FMODE_READ))
goto fput_in;
retval = -ESPIPE;
if (!ppos)
- ppos = &in_file->f_pos;
+ ppos = &in.file->f_pos;
else
- if (!(in_file->f_mode & FMODE_PREAD))
+ if (!(in.file->f_mode & FMODE_PREAD))
goto fput_in;
- retval = rw_verify_area(READ, in_file, ppos, count);
+ retval = rw_verify_area(READ, in.file, ppos, count);
if (retval < 0)
goto fput_in;
count = retval;
@@ -917,15 +895,15 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
* Get output file, and verify that it is ok..
*/
retval = -EBADF;
- out_file = fget_light(out_fd, &fput_needed_out);
- if (!out_file)
+ out = fdget(out_fd);
+ if (!out.file)
goto fput_in;
- if (!(out_file->f_mode & FMODE_WRITE))
+ if (!(out.file->f_mode & FMODE_WRITE))
goto fput_out;
retval = -EINVAL;
- in_inode = in_file->f_path.dentry->d_inode;
- out_inode = out_file->f_path.dentry->d_inode;
- retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count);
+ in_inode = in.file->f_path.dentry->d_inode;
+ out_inode = out.file->f_path.dentry->d_inode;
+ retval = rw_verify_area(WRITE, out.file, &out.file->f_pos, count);
if (retval < 0)
goto fput_out;
count = retval;
@@ -949,10 +927,10 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
* and the application is arguably buggy if it doesn't expect
* EAGAIN on a non-blocking file descriptor.
*/
- if (in_file->f_flags & O_NONBLOCK)
+ if (in.file->f_flags & O_NONBLOCK)
fl = SPLICE_F_NONBLOCK;
#endif
- retval = do_splice_direct(in_file, ppos, out_file, count, fl);
+ retval = do_splice_direct(in.file, ppos, out.file, count, fl);
if (retval > 0) {
add_rchar(current, retval);
@@ -965,9 +943,9 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
retval = -EOVERFLOW;
fput_out:
- fput_light(out_file, fput_needed_out);
+ fdput(out);
fput_in:
- fput_light(in_file, fput_needed_in);
+ fdput(in);
out:
return retval;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.