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authorAl Viro <viro@zeniv.linux.org.uk>2015-04-01 23:42:28 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-04-11 22:28:27 -0400
commite1200fe68f20759f359698f8a8dc81d06d1265f5 (patch)
tree2f6a596be0d8d2aa759687be4c0e9f4e0ecc1723 /fs/9p
parent9565a5445240cd441f2c670aa7260ee8eb5dff79 (diff)
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9p: switch p9_client_read() to passing struct iov_iter *
... and make it loop Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/9p')
-rw-r--r--fs/9p/v9fs_vfs.h2
-rw-r--r--fs/9p/vfs_addr.c20
-rw-r--r--fs/9p/vfs_dir.c15
-rw-r--r--fs/9p/vfs_file.c79
-rw-r--r--fs/9p/xattr.c48
5 files changed, 46 insertions, 118 deletions
diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index cff1e61d9355..5a0db6dec8d1 100644
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -68,8 +68,6 @@ int v9fs_file_open(struct inode *inode, struct file *file);
void v9fs_inode2stat(struct inode *inode, struct p9_wstat *stat);
int v9fs_uflags2omode(int uflags, int extended);
-ssize_t v9fs_file_readn(struct file *, char *, char __user *, u32, u64);
-ssize_t v9fs_fid_readn(struct p9_fid *, char *, char __user *, u32, u64);
void v9fs_blank_wstat(struct p9_wstat *wstat);
int v9fs_vfs_setattr_dotl(struct dentry *, struct iattr *);
int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end,
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 402269c108cd..afe3225aaf36 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -51,12 +51,11 @@
*/
static int v9fs_fid_readpage(struct p9_fid *fid, struct page *page)
{
- int retval;
- loff_t offset;
- char *buffer;
- struct inode *inode;
+ struct inode *inode = page->mapping->host;
+ struct bio_vec bvec = {.bv_page = page, .bv_len = PAGE_SIZE};
+ struct iov_iter to;
+ int retval, err;
- inode = page->mapping->host;
p9_debug(P9_DEBUG_VFS, "\n");
BUG_ON(!PageLocked(page));
@@ -65,16 +64,16 @@ static int v9fs_fid_readpage(struct p9_fid *fid, struct page *page)
if (retval == 0)
return retval;
- buffer = kmap(page);
- offset = page_offset(page);
+ iov_iter_bvec(&to, ITER_BVEC | READ, &bvec, 1, PAGE_SIZE);
- retval = v9fs_fid_readn(fid, buffer, NULL, PAGE_CACHE_SIZE, offset);
- if (retval < 0) {
+ retval = p9_client_read(fid, page_offset(page), &to, &err);
+ if (err) {
v9fs_uncache_page(inode, page);
+ retval = err;
goto done;
}
- memset(buffer + retval, 0, PAGE_CACHE_SIZE - retval);
+ zero_user(page, retval, PAGE_SIZE - retval);
flush_dcache_page(page);
SetPageUptodate(page);
@@ -82,7 +81,6 @@ static int v9fs_fid_readpage(struct p9_fid *fid, struct page *page)
retval = 0;
done:
- kunmap(page);
unlock_page(page);
return retval;
}
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 4f1151088ebe..76c3b1ab6361 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -33,6 +33,7 @@
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/slab.h>
+#include <linux/uio.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>
@@ -115,6 +116,7 @@ static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
int buflen;
int reclen = 0;
struct p9_rdir *rdir;
+ struct kvec kvec;
p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
fid = file->private_data;
@@ -124,16 +126,21 @@ static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
rdir = v9fs_alloc_rdir_buf(file, buflen);
if (!rdir)
return -ENOMEM;
+ kvec.iov_base = rdir->buf;
+ kvec.iov_len = buflen;
while (1) {
if (rdir->tail == rdir->head) {
- err = v9fs_file_readn(file, rdir->buf, NULL,
- buflen, ctx->pos);
- if (err <= 0)
+ struct iov_iter to;
+ int n;
+ iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buflen);
+ n = p9_client_read(file->private_data, ctx->pos, &to,
+ &err);
+ if (err)
return err;
rdir->head = 0;
- rdir->tail = err;
+ rdir->tail = n;
}
while (rdir->head < rdir->tail) {
p9stat_init(&st);
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 1e4619693721..069f70d3758f 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -365,63 +365,6 @@ out_err:
}
/**
- * v9fs_fid_readn - read from a fid
- * @fid: fid to read
- * @data: data buffer to read data into
- * @udata: user data buffer to read data into
- * @count: size of buffer
- * @offset: offset at which to read data
- *
- */
-ssize_t
-v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count,
- u64 offset)
-{
- int n, total, size;
-
- p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n",
- fid->fid, (long long unsigned)offset, count);
- n = 0;
- total = 0;
- size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
- do {
- n = p9_client_read(fid, data, udata, offset, count);
- if (n <= 0)
- break;
-
- if (data)
- data += n;
- if (udata)
- udata += n;
-
- offset += n;
- count -= n;
- total += n;
- } while (count > 0 && n == size);
-
- if (n < 0)
- total = n;
-
- return total;
-}
-
-/**
- * v9fs_file_readn - read from a file
- * @filp: file pointer to read
- * @data: data buffer to read data into
- * @udata: user data buffer to read data into
- * @count: size of buffer
- * @offset: offset at which to read data
- *
- */
-ssize_t
-v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count,
- u64 offset)
-{
- return v9fs_fid_readn(filp->private_data, data, udata, count, offset);
-}
-
-/**
* v9fs_file_read - read from a file
* @filp: file pointer to read
* @udata: user data buffer to read data into
@@ -434,22 +377,20 @@ static ssize_t
v9fs_file_read(struct file *filp, char __user *udata, size_t count,
loff_t * offset)
{
- int ret;
- struct p9_fid *fid;
- size_t size;
+ struct p9_fid *fid = filp->private_data;
+ struct iovec iov = {.iov_base = udata, .iov_len = count};
+ struct iov_iter to;
+ int ret, err;
- p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
- fid = filp->private_data;
+ iov_iter_init(&to, READ, &iov, 1, count);
- size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ;
- if (count > size)
- ret = v9fs_file_readn(filp, NULL, udata, count, *offset);
- else
- ret = p9_client_read(fid, NULL, udata, *offset, count);
+ p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset);
- if (ret > 0)
- *offset += ret;
+ ret = p9_client_read(fid, *offset, &to, &err);
+ if (!ret)
+ return err;
+ *offset += ret;
return ret;
}
diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c
index d4cab07f668d..0cf44b6cccd6 100644
--- a/fs/9p/xattr.c
+++ b/fs/9p/xattr.c
@@ -26,50 +26,34 @@ ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
void *buffer, size_t buffer_size)
{
ssize_t retval;
- int msize, read_count;
- u64 offset = 0, attr_size;
+ u64 attr_size;
struct p9_fid *attr_fid;
+ struct kvec kvec = {.iov_base = buffer, .iov_len = buffer_size};
+ struct iov_iter to;
+ int err;
+
+ iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buffer_size);
attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
if (IS_ERR(attr_fid)) {
retval = PTR_ERR(attr_fid);
p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
retval);
- attr_fid = NULL;
- goto error;
- }
- if (!buffer_size) {
- /* request to get the attr_size */
- retval = attr_size;
- goto error;
+ return retval;
}
if (attr_size > buffer_size) {
- retval = -ERANGE;
- goto error;
- }
- msize = attr_fid->clnt->msize;
- while (attr_size) {
- if (attr_size > (msize - P9_IOHDRSZ))
- read_count = msize - P9_IOHDRSZ;
+ if (!buffer_size) /* request to get the attr_size */
+ retval = attr_size;
else
- read_count = attr_size;
- read_count = p9_client_read(attr_fid, ((char *)buffer)+offset,
- NULL, offset, read_count);
- if (read_count < 0) {
- /* error in xattr read */
- retval = read_count;
- goto error;
- }
- offset += read_count;
- attr_size -= read_count;
+ retval = -ERANGE;
+ } else {
+ iov_iter_truncate(&to, attr_size);
+ retval = p9_client_read(attr_fid, 0, &to, &err);
+ if (err)
+ retval = err;
}
- /* Total read xattr bytes */
- retval = offset;
-error:
- if (attr_fid)
- p9_client_clunk(attr_fid);
+ p9_client_clunk(attr_fid);
return retval;
-
}