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![Joe Perches](/assets/img/avatar_default.png)
Reduce object size by deduplicating formats. Use vsprintf extension %pV. Rename P9_DPRINTK uses to p9_debug, align arguments. Add function for _p9_debug and macro to add __func__. Add missing "\n"s to p9_debug uses. Remove embedded function names as p9_debug adds it. Remove P9_EPRINTK macro and convert use to pr_<level>. Add and use pr_fmt and pr_<level>. $ size fs/9p/built-in.o* text data bss dec hex filename 62133 984 16000 79117 1350d fs/9p/built-in.o.new 67342 984 16928 85254 14d06 fs/9p/built-in.o.old $ size net/9p/built-in.o* text data bss dec hex filename 88792 4148 22024 114964 1c114 net/9p/built-in.o.new 94072 4148 23232 121452 1da6c net/9p/built-in.o.old Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
172 lines
4.3 KiB
C
172 lines
4.3 KiB
C
/*
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* Copyright IBM Corporation, 2010
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* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "fid.h"
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#include "xattr.h"
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ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
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void *buffer, size_t buffer_size)
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{
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ssize_t retval;
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int msize, read_count;
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u64 offset = 0, attr_size;
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struct p9_fid *attr_fid;
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attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
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if (IS_ERR(attr_fid)) {
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retval = PTR_ERR(attr_fid);
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p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
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retval);
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attr_fid = NULL;
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goto error;
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}
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if (!buffer_size) {
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/* request to get the attr_size */
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retval = attr_size;
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goto error;
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}
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if (attr_size > buffer_size) {
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retval = -ERANGE;
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goto error;
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}
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msize = attr_fid->clnt->msize;
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while (attr_size) {
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if (attr_size > (msize - P9_IOHDRSZ))
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read_count = msize - P9_IOHDRSZ;
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else
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read_count = attr_size;
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read_count = p9_client_read(attr_fid, ((char *)buffer)+offset,
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NULL, offset, read_count);
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if (read_count < 0) {
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/* error in xattr read */
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retval = read_count;
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goto error;
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}
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offset += read_count;
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attr_size -= read_count;
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}
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/* Total read xattr bytes */
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retval = offset;
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error:
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if (attr_fid)
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p9_client_clunk(attr_fid);
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return retval;
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}
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/*
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* v9fs_xattr_get()
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*
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* Copy an extended attribute into the buffer
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* provided, or compute the buffer size required.
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* Buffer is NULL to compute the size of the buffer required.
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*
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* Returns a negative error number on failure, or the number of bytes
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* used / required on success.
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*/
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ssize_t v9fs_xattr_get(struct dentry *dentry, const char *name,
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void *buffer, size_t buffer_size)
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{
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struct p9_fid *fid;
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p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu\n",
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name, buffer_size);
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fid = v9fs_fid_lookup(dentry);
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if (IS_ERR(fid))
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return PTR_ERR(fid);
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return v9fs_fid_xattr_get(fid, name, buffer, buffer_size);
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}
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/*
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* v9fs_xattr_set()
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*
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* Create, replace or remove an extended attribute for this inode. Buffer
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* is NULL to remove an existing extended attribute, and non-NULL to
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* either replace an existing extended attribute, or create a new extended
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* attribute. The flags XATTR_REPLACE and XATTR_CREATE
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* specify that an extended attribute must exist and must not exist
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* previous to the call, respectively.
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*
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* Returns 0, or a negative error number on failure.
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*/
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int v9fs_xattr_set(struct dentry *dentry, const char *name,
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const void *value, size_t value_len, int flags)
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{
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u64 offset = 0;
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int retval, msize, write_count;
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struct p9_fid *fid = NULL;
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p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
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name, value_len, flags);
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fid = v9fs_fid_clone(dentry);
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if (IS_ERR(fid)) {
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retval = PTR_ERR(fid);
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fid = NULL;
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goto error;
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}
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/*
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* On success fid points to xattr
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*/
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retval = p9_client_xattrcreate(fid, name, value_len, flags);
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if (retval < 0) {
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p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
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retval);
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goto error;
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}
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msize = fid->clnt->msize;
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while (value_len) {
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if (value_len > (msize - P9_IOHDRSZ))
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write_count = msize - P9_IOHDRSZ;
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else
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write_count = value_len;
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write_count = p9_client_write(fid, ((char *)value)+offset,
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NULL, offset, write_count);
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if (write_count < 0) {
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/* error in xattr write */
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retval = write_count;
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goto error;
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}
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offset += write_count;
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value_len -= write_count;
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}
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/* Total read xattr bytes */
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retval = offset;
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error:
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if (fid)
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retval = p9_client_clunk(fid);
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return retval;
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}
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ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
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{
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return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
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}
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const struct xattr_handler *v9fs_xattr_handlers[] = {
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&v9fs_xattr_user_handler,
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#ifdef CONFIG_9P_FS_POSIX_ACL
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&v9fs_xattr_acl_access_handler,
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&v9fs_xattr_acl_default_handler,
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#endif
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NULL
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};
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