kill generic_segment_checks()
all callers of ->aio_read() and ->aio_write() have iov/nr_segs already
checked - generic_segment_checks() done after that is just an odd way
to spell iov_length().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index 8e844a6..220bd83 100644
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -1180,9 +1180,7 @@
ssize_t result;
int refcheck;
- result = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
- if (result)
- return result;
+ count = iov_length(iov, nr_segs);
env = cl_env_get(&refcheck);
if (IS_ERR(env))
@@ -1235,14 +1233,10 @@
{
struct lu_env *env;
struct vvp_io_args *args;
- size_t count = 0;
+ size_t count = iov_length(iov, nr_segs);
ssize_t result;
int refcheck;
- result = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
- if (result)
- return result;
-
env = cl_env_get(&refcheck);
if (IS_ERR(env))
return PTR_ERR(env);
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 1dafe07..a0a94a3 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1726,12 +1726,7 @@
mutex_lock(&inode->i_mutex);
- err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
- if (err) {
- mutex_unlock(&inode->i_mutex);
- goto out;
- }
- count = ocount;
+ count = ocount = iov_length(iov, nr_segs);
current->backing_dev_info = inode->i_mapping->backing_dev_info;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index ef9115e..21a56c2 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -828,12 +828,8 @@
inode, ceph_vinop(inode), iocb->ki_pos, (unsigned)len,
ceph_cap_string(got));
- if (!read) {
- ret = generic_segment_checks(iov, &nr_segs,
- &len, VERIFY_WRITE);
- if (ret)
- goto out;
- }
+ if (!read)
+ len = iov_length(iov, nr_segs);
iov_iter_init(&i, iov, nr_segs, len, read);
@@ -855,7 +851,6 @@
ret = generic_file_aio_read(iocb, iov, nr_segs, pos);
}
-out:
dout("aio_read %p %llx.%llx dropping cap refs on %s = %d\n",
inode, ceph_vinop(inode), ceph_cap_string(got), (int)ret);
ceph_put_cap_refs(ci, got);
@@ -911,9 +906,7 @@
mutex_lock(&inode->i_mutex);
- err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
- if (err)
- goto out;
+ count = iov_length(iov, nr_segs);
/* We can write back this queue in page reclaim */
current->backing_dev_info = file->f_mapping->backing_dev_info;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 126deb5..9c7f346 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1208,12 +1208,7 @@
WARN_ON(iocb->ki_pos != pos);
- ocount = 0;
- err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
- if (err)
- return err;
-
- count = ocount;
+ count = ocount = iov_length(iov, nr_segs);
mutex_lock(&inode->i_mutex);
/* We can write back this queue in page reclaim */
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index db9bd8a..b6fa457 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -2091,10 +2091,7 @@
size_t count; /* after file limit checks */
ssize_t written, err;
- count = 0;
- err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
- if (err)
- return err;
+ count = iov_length(iov, nr_segs);
pos = *ppos;
/* We can write back this queue in page reclaim. */
current->backing_dev_info = mapping->backing_dev_info;
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index d6d78c2..d33c4ce 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2355,12 +2355,7 @@
/* communicate with ocfs2_dio_end_io */
ocfs2_iocb_set_rw_locked(iocb, rw_level);
- ret = generic_segment_checks(iov, &nr_segs, &ocount,
- VERIFY_READ);
- if (ret)
- goto out_dio;
-
- count = ocount;
+ count = ocount = iov_length(iov, nr_segs);
ret = generic_write_checks(file, ppos, &count,
S_ISBLK(inode->i_mode));
if (ret)
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 8617497..f0f8084 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -253,9 +253,7 @@
if (file->f_mode & FMODE_NOCMTIME)
ioflags |= IO_INVIS;
- ret = generic_segment_checks(iovp, &nr_segs, &size, VERIFY_WRITE);
- if (ret < 0)
- return ret;
+ size = iov_length(iovp, nr_segs);
if (unlikely(ioflags & IO_ISDIRECT)) {
xfs_buftarg_t *target =
@@ -777,10 +775,7 @@
BUG_ON(iocb->ki_pos != pos);
- ret = generic_segment_checks(iovp, &nr_segs, &ocount, VERIFY_READ);
- if (ret)
- return ret;
-
+ ocount = iov_length(iovp, nr_segs);
if (ocount == 0)
return 0;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 262f96e..796de74 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2412,8 +2412,6 @@
extern ssize_t generic_perform_write(struct file *, struct iov_iter *, loff_t);
extern ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos);
extern ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos);
-extern int generic_segment_checks(const struct iovec *iov,
- unsigned long *nr_segs, size_t *count, int access_flags);
/* fs/block_dev.c */
extern ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov,
diff --git a/mm/filemap.c b/mm/filemap.c
index a840890..7c1417b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1663,45 +1663,6 @@
return written ? written : error;
}
-/*
- * Performs necessary checks before doing a write
- * @iov: io vector request
- * @nr_segs: number of segments in the iovec
- * @count: number of bytes to write
- * @access_flags: type of access: %VERIFY_READ or %VERIFY_WRITE
- *
- * Adjust number of segments and amount of bytes to write (nr_segs should be
- * properly initialized first). Returns appropriate error code that caller
- * should return or zero in case that write should be allowed.
- */
-int generic_segment_checks(const struct iovec *iov,
- unsigned long *nr_segs, size_t *count, int access_flags)
-{
- unsigned long seg;
- size_t cnt = 0;
- for (seg = 0; seg < *nr_segs; seg++) {
- const struct iovec *iv = &iov[seg];
-
- /*
- * If any segment has a negative length, or the cumulative
- * length ever wraps negative then return -EINVAL.
- */
- cnt += iv->iov_len;
- if (unlikely((ssize_t)(cnt|iv->iov_len) < 0))
- return -EINVAL;
- if (access_ok(access_flags, iv->iov_base, iv->iov_len))
- continue;
- if (seg == 0)
- return -EFAULT;
- *nr_segs = seg;
- cnt -= iv->iov_len; /* This segment is no good */
- break;
- }
- *count = cnt;
- return 0;
-}
-EXPORT_SYMBOL(generic_segment_checks);
-
/**
* generic_file_aio_read - generic filesystem read routine
* @iocb: kernel I/O control block
@@ -1717,15 +1678,12 @@
unsigned long nr_segs, loff_t pos)
{
struct file *filp = iocb->ki_filp;
- ssize_t retval;
+ ssize_t retval = 0;
size_t count;
loff_t *ppos = &iocb->ki_pos;
struct iov_iter i;
- count = 0;
- retval = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
- if (retval)
- return retval;
+ count = iov_length(iov, nr_segs);
iov_iter_init(&i, iov, nr_segs, count, 0);
/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
@@ -2615,12 +2573,7 @@
ssize_t status;
struct iov_iter from;
- ocount = 0;
- err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
- if (err)
- return err;
-
- count = ocount;
+ count = ocount = iov_length(iov, nr_segs);
/* We can write back this queue in page reclaim */
current->backing_dev_info = mapping->backing_dev_info;
diff --git a/mm/shmem.c b/mm/shmem.c
index 9f70e02..2a93e62 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1412,14 +1412,11 @@
unsigned long offset;
enum sgp_type sgp = SGP_READ;
int error = 0;
- ssize_t retval;
- size_t count;
+ ssize_t retval = 0;
+ size_t count = iov_length(iov, nr_segs);
loff_t *ppos = &iocb->ki_pos;
struct iov_iter iter;
- retval = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
- if (retval)
- return retval;
iov_iter_init(&iter, iov, nr_segs, count, 0);
/*