diff options
Diffstat (limited to 'fs/9p')
| -rw-r--r-- | fs/9p/Makefile | 4 | ||||
| -rw-r--r-- | fs/9p/vfs_inode.c | 15 | ||||
| -rw-r--r-- | fs/9p/vfs_super.c | 6 | ||||
| -rw-r--r-- | fs/9p/xattr.c | 160 | ||||
| -rw-r--r-- | fs/9p/xattr.h | 27 | ||||
| -rw-r--r-- | fs/9p/xattr_user.c | 80 |
6 files changed, 289 insertions, 3 deletions
diff --git a/fs/9p/Makefile b/fs/9p/Makefile index 1a940ec..91fba02 100644 --- a/fs/9p/Makefile +++ b/fs/9p/Makefile @@ -8,6 +8,8 @@ obj-$(CONFIG_9P_FS) := 9p.o vfs_dir.o \ vfs_dentry.o \ v9fs.o \ - fid.o + fid.o \ + xattr.o \ + xattr_user.o 9p-$(CONFIG_9P_FSCACHE) += cache.o diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index 2ac2459..39352ef 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -35,6 +35,7 @@ #include <linux/idr.h> #include <linux/sched.h> #include <linux/slab.h> +#include <linux/xattr.h> #include <net/9p/9p.h> #include <net/9p/client.h> @@ -42,6 +43,7 @@ #include "v9fs_vfs.h" #include "fid.h" #include "cache.h" +#include "xattr.h" static const struct inode_operations v9fs_dir_inode_operations; static const struct inode_operations v9fs_dir_inode_operations_dotu; @@ -1931,6 +1933,11 @@ static const struct inode_operations v9fs_dir_inode_operations_dotl = { .rename = v9fs_vfs_rename, .getattr = v9fs_vfs_getattr_dotl, .setattr = v9fs_vfs_setattr_dotl, + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .removexattr = generic_removexattr, + .listxattr = v9fs_listxattr, + }; static const struct inode_operations v9fs_dir_inode_operations = { @@ -1953,6 +1960,10 @@ static const struct inode_operations v9fs_file_inode_operations = { static const struct inode_operations v9fs_file_inode_operations_dotl = { .getattr = v9fs_vfs_getattr_dotl, .setattr = v9fs_vfs_setattr_dotl, + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .removexattr = generic_removexattr, + .listxattr = v9fs_listxattr, }; static const struct inode_operations v9fs_symlink_inode_operations = { @@ -1969,4 +1980,8 @@ static const struct inode_operations v9fs_symlink_inode_operations_dotl = { .put_link = v9fs_vfs_put_link, .getattr = v9fs_vfs_getattr_dotl, .setattr = v9fs_vfs_setattr_dotl, + .setxattr = generic_setxattr, + .getxattr = generic_getxattr, + .removexattr = generic_removexattr, + .listxattr = v9fs_listxattr, }; diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c index 3623f69..0a2e203 100644 --- a/fs/9p/vfs_super.c +++ b/fs/9p/vfs_super.c @@ -45,6 +45,7 @@ #include "v9fs.h" #include "v9fs_vfs.h" #include "fid.h" +#include "xattr.h" static const struct super_operations v9fs_super_ops, v9fs_super_ops_dotl; @@ -77,9 +78,10 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses, sb->s_blocksize_bits = fls(v9ses->maxdata - 1); sb->s_blocksize = 1 << sb->s_blocksize_bits; sb->s_magic = V9FS_MAGIC; - if (v9fs_proto_dotl(v9ses)) + if (v9fs_proto_dotl(v9ses)) { sb->s_op = &v9fs_super_ops_dotl; - else + sb->s_xattr = v9fs_xattr_handlers; + } else sb->s_op = &v9fs_super_ops; sb->s_bdi = &v9ses->bdi; diff --git a/fs/9p/xattr.c b/fs/9p/xattr.c new file mode 100644 index 0000000..c434424 --- /dev/null +++ b/fs/9p/xattr.c @@ -0,0 +1,160 @@ +/* + * Copyright IBM Corporation, 2010 + * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2.1 of the GNU Lesser General Public License + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + */ + +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/sched.h> +#include <net/9p/9p.h> +#include <net/9p/client.h> + +#include "fid.h" +#include "xattr.h" + +/* + * v9fs_xattr_get() + * + * Copy an extended attribute into the buffer + * provided, or compute the buffer size required. + * Buffer is NULL to compute the size of the buffer required. + * + * Returns a negative error number on failure, or the number of bytes + * used / required on success. + */ +ssize_t v9fs_xattr_get(struct dentry *dentry, const char *name, + void *buffer, size_t buffer_size) +{ + ssize_t retval; + int msize, read_count; + u64 offset = 0, attr_size; + struct p9_fid *fid, *attr_fid; + + P9_DPRINTK(P9_DEBUG_VFS, "%s: name = %s value_len = %zu\n", + __func__, name, buffer_size); + + fid = v9fs_fid_lookup(dentry); + if (IS_ERR(fid)) + return PTR_ERR(fid); + + attr_fid = p9_client_xattrwalk(fid, name, &attr_size); + if (IS_ERR(attr_fid)) { + retval = PTR_ERR(attr_fid); + P9_DPRINTK(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; + } + 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; + else + read_count = attr_size; + read_count = p9_client_read(attr_fid, ((char *)buffer)+offset, + 0, offset, read_count); + if (read_count < 0) { + /* error in xattr read */ + retval = read_count; + goto error; + } + offset += read_count; + attr_size -= read_count; + } + /* Total read xattr bytes */ + retval = offset; +error: + if (attr_fid) + p9_client_clunk(attr_fid); + return retval; + +} + +/* + * v9fs_xattr_set() + * + * Create, replace or remove an extended attribute for this inode. Buffer + * is NULL to remove an existing extended attribute, and non-NULL to + * either replace an existing extended attribute, or create a new extended + * attribute. The flags XATTR_REPLACE and XATTR_CREATE + * specify that an extended attribute must exist and must not exist + * previous to the call, respectively. + * + * Returns 0, or a negative error number on failure. + */ +int v9fs_xattr_set(struct dentry *dentry, const char *name, + const void *value, size_t value_len, int flags) +{ + u64 offset = 0; + int retval, msize, write_count; + struct p9_fid *fid = NULL; + + P9_DPRINTK(P9_DEBUG_VFS, "%s: name = %s value_len = %zu flags = %d\n", + __func__, name, value_len, flags); + + fid = v9fs_fid_clone(dentry); + if (IS_ERR(fid)) { + retval = PTR_ERR(fid); + fid = NULL; + goto error; + } + /* + * On success fid points to xattr + */ + retval = p9_client_xattrcreate(fid, name, value_len, flags); + if (retval < 0) { + P9_DPRINTK(P9_DEBUG_VFS, + "p9_client_xattrcreate failed %d\n", retval); + goto error; + } + msize = fid->clnt->msize;; + while (value_len) { + if (value_len > (msize - P9_IOHDRSZ)) + write_count = msize - P9_IOHDRSZ; + else + write_count = value_len; + write_count = p9_client_write(fid, ((char *)value)+offset, + 0, offset, write_count); + if (write_count < 0) { + /* error in xattr write */ + retval = write_count; + goto error; + } + offset += write_count; + value_len -= write_count; + } + /* Total read xattr bytes */ + retval = offset; +error: + if (fid) + retval = p9_client_clunk(fid); + return retval; +} + +ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) +{ + return v9fs_xattr_get(dentry, NULL, buffer, buffer_size); +} + +const struct xattr_handler *v9fs_xattr_handlers[] = { + &v9fs_xattr_user_handler, + NULL +}; diff --git a/fs/9p/xattr.h b/fs/9p/xattr.h new file mode 100644 index 0000000..9ddf672 --- /dev/null +++ b/fs/9p/xattr.h @@ -0,0 +1,27 @@ +/* + * Copyright IBM Corporation, 2010 + * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2.1 of the GNU Lesser General Public License + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + */ +#ifndef FS_9P_XATTR_H +#define FS_9P_XATTR_H + +#include <linux/xattr.h> + +extern const struct xattr_handler *v9fs_xattr_handlers[]; +extern struct xattr_handler v9fs_xattr_user_handler; + +extern ssize_t v9fs_xattr_get(struct dentry *, const char *, + void *, size_t); +extern int v9fs_xattr_set(struct dentry *, const char *, + const void *, size_t, int); +extern ssize_t v9fs_listxattr(struct dentry *, char *, size_t); +#endif /* FS_9P_XATTR_H */ diff --git a/fs/9p/xattr_user.c b/fs/9p/xattr_user.c new file mode 100644 index 0000000..d0b701b --- /dev/null +++ b/fs/9p/xattr_user.c @@ -0,0 +1,80 @@ +/* + * Copyright IBM Corporation, 2010 + * Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2.1 of the GNU Lesser General Public License + * as published by the Free Software Foundation. + * + * This program is distributed in the hope that it would be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + * + */ + + +#include <linux/module.h> +#include <linux/string.h> +#include <linux/fs.h> +#include <linux/slab.h> +#include "xattr.h" + +static int v9fs_xattr_user_get(struct dentry *dentry, const char *name, + void *buffer, size_t size, int type) +{ + int retval; + char *full_name; + size_t name_len; + size_t prefix_len = XATTR_USER_PREFIX_LEN; + + if (name == NULL) + return -EINVAL; + + if (strcmp(name, "") == 0) + return -EINVAL; + + name_len = strlen(name); + full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL); + if (!full_name) + return -ENOMEM; + memcpy(full_name, XATTR_USER_PREFIX, prefix_len); + memcpy(full_name+prefix_len, name, name_len); + full_name[prefix_len + name_len] = '\0'; + + retval = v9fs_xattr_get(dentry, full_name, buffer, size); + kfree(full_name); + return retval; +} + +static int v9fs_xattr_user_set(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags, int type) +{ + int retval; + char *full_name; + size_t name_len; + size_t prefix_len = XATTR_USER_PREFIX_LEN; + + if (name == NULL) + return -EINVAL; + + if (strcmp(name, "") == 0) + return -EINVAL; + + name_len = strlen(name); + full_name = kmalloc(prefix_len + name_len + 1 , GFP_KERNEL); + if (!full_name) + return -ENOMEM; + memcpy(full_name, XATTR_USER_PREFIX, prefix_len); + memcpy(full_name + prefix_len, name, name_len); + full_name[prefix_len + name_len] = '\0'; + + retval = v9fs_xattr_set(dentry, full_name, value, size, flags); + kfree(full_name); + return retval; +} + +struct xattr_handler v9fs_xattr_user_handler = { + .prefix = XATTR_USER_PREFIX, + .get = v9fs_xattr_user_get, + .set = v9fs_xattr_user_set, +}; |
