diff options
Diffstat (limited to 'fs/9p')
| -rw-r--r-- | fs/9p/v9fs.h | 2 | ||||
| -rw-r--r-- | fs/9p/vfs_inode.c | 123 | ||||
| -rw-r--r-- | fs/9p/vfs_inode_dotl.c | 39 |
3 files changed, 36 insertions, 128 deletions
diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h index fb9ffcb43277..0923f2cf3c80 100644 --- a/fs/9p/v9fs.h +++ b/fs/9p/v9fs.h @@ -149,8 +149,6 @@ extern int v9fs_vfs_unlink(struct inode *i, struct dentry *d); extern int v9fs_vfs_rmdir(struct inode *i, struct dentry *d); extern int v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry); -extern void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, - void *p); extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, struct super_block *sb, int new); diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index 703342e309f5..510040b04c96 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -1224,100 +1224,43 @@ ino_t v9fs_qid2ino(struct p9_qid *qid) } /** - * v9fs_readlink - read a symlink's location (internal version) + * v9fs_vfs_follow_link - follow a symlink path * @dentry: dentry for symlink - * @buffer: buffer to load symlink location into - * @buflen: length of buffer - * + * @cookie: place to pass the data to put_link() */ -static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) +static const char *v9fs_vfs_follow_link(struct dentry *dentry, void **cookie) { - int retval; - - struct v9fs_session_info *v9ses; - struct p9_fid *fid; + struct v9fs_session_info *v9ses = v9fs_dentry2v9ses(dentry); + struct p9_fid *fid = v9fs_fid_lookup(dentry); struct p9_wstat *st; + char *res; + + p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); - p9_debug(P9_DEBUG_VFS, " %pd\n", dentry); - retval = -EPERM; - v9ses = v9fs_dentry2v9ses(dentry); - fid = v9fs_fid_lookup(dentry); if (IS_ERR(fid)) - return PTR_ERR(fid); + return ERR_CAST(fid); if (!v9fs_proto_dotu(v9ses)) - return -EBADF; + return ERR_PTR(-EBADF); st = p9_client_stat(fid); if (IS_ERR(st)) - return PTR_ERR(st); + return ERR_CAST(st); if (!(st->mode & P9_DMSYMLINK)) { - retval = -EINVAL; - goto done; + p9stat_free(st); + kfree(st); + return ERR_PTR(-EINVAL); } + res = st->extension; + st->extension = NULL; + if (strlen(res) >= PATH_MAX) + res[PATH_MAX - 1] = '\0'; - /* copy extension buffer into buffer */ - retval = min(strlen(st->extension)+1, (size_t)buflen); - memcpy(buffer, st->extension, retval); - - p9_debug(P9_DEBUG_VFS, "%pd -> %s (%.*s)\n", - dentry, st->extension, buflen, buffer); - -done: p9stat_free(st); kfree(st); - return retval; -} - -/** - * v9fs_vfs_follow_link - follow a symlink path - * @dentry: dentry for symlink - * @nd: nameidata - * - */ - -static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) -{ - int len = 0; - char *link = __getname(); - - p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); - - if (!link) - link = ERR_PTR(-ENOMEM); - else { - len = v9fs_readlink(dentry, link, PATH_MAX); - - if (len < 0) { - __putname(link); - link = ERR_PTR(len); - } else - link[min(len, PATH_MAX-1)] = 0; - } - nd_set_link(nd, link); - - return NULL; -} - -/** - * v9fs_vfs_put_link - release a symlink path - * @dentry: dentry for symlink - * @nd: nameidata - * @p: unused - * - */ - -void -v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) -{ - char *s = nd_get_link(nd); - - p9_debug(P9_DEBUG_VFS, " %pd %s\n", - dentry, IS_ERR(s) ? "<error>" : s); - if (!IS_ERR(s)) - __putname(s); + return *cookie = res; } /** @@ -1370,6 +1313,8 @@ v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); } +#define U32_MAX_DIGITS 10 + /** * v9fs_vfs_link - create a hardlink * @old_dentry: dentry for file to link to @@ -1383,7 +1328,7 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { int retval; - char *name; + char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ struct p9_fid *oldfid; p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", @@ -1393,20 +1338,12 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, if (IS_ERR(oldfid)) return PTR_ERR(oldfid); - name = __getname(); - if (unlikely(!name)) { - retval = -ENOMEM; - goto clunk_fid; - } - sprintf(name, "%d\n", oldfid->fid); retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); - __putname(name); if (!retval) { v9fs_refresh_inode(oldfid, d_inode(old_dentry)); v9fs_invalidate_inode_attr(dir); } -clunk_fid: p9_client_clunk(oldfid); return retval; } @@ -1425,7 +1362,7 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rde { struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); int retval; - char *name; + char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; u32 perm; p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", @@ -1435,26 +1372,16 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rde if (!new_valid_dev(rdev)) return -EINVAL; - name = __getname(); - if (!name) - return -ENOMEM; /* build extension */ if (S_ISBLK(mode)) sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); else if (S_ISCHR(mode)) sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); - else if (S_ISFIFO(mode)) - *name = 0; - else if (S_ISSOCK(mode)) + else *name = 0; - else { - __putname(name); - return -EINVAL; - } perm = unixmode2p9mode(v9ses, mode); retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); - __putname(name); return retval; } @@ -1530,7 +1457,7 @@ static const struct inode_operations v9fs_file_inode_operations = { static const struct inode_operations v9fs_symlink_inode_operations = { .readlink = generic_readlink, .follow_link = v9fs_vfs_follow_link, - .put_link = v9fs_vfs_put_link, + .put_link = kfree_put_link, .getattr = v9fs_vfs_getattr, .setattr = v9fs_vfs_setattr, }; diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c index 9861c7c951a6..09e4433717b8 100644 --- a/fs/9p/vfs_inode_dotl.c +++ b/fs/9p/vfs_inode_dotl.c @@ -905,41 +905,24 @@ error: /** * v9fs_vfs_follow_link_dotl - follow a symlink path * @dentry: dentry for symlink - * @nd: nameidata - * + * @cookie: place to pass the data to put_link() */ -static void * -v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) +static const char * +v9fs_vfs_follow_link_dotl(struct dentry *dentry, void **cookie) { - int retval; - struct p9_fid *fid; - char *link = __getname(); + struct p9_fid *fid = v9fs_fid_lookup(dentry); char *target; + int retval; p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); - if (!link) { - link = ERR_PTR(-ENOMEM); - goto ndset; - } - fid = v9fs_fid_lookup(dentry); - if (IS_ERR(fid)) { - __putname(link); - link = ERR_CAST(fid); - goto ndset; - } + if (IS_ERR(fid)) + return ERR_CAST(fid); retval = p9_client_readlink(fid, &target); - if (!retval) { - strcpy(link, target); - kfree(target); - goto ndset; - } - __putname(link); - link = ERR_PTR(retval); -ndset: - nd_set_link(nd, link); - return NULL; + if (retval) + return ERR_PTR(retval); + return *cookie = target; } int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) @@ -1006,7 +989,7 @@ const struct inode_operations v9fs_file_inode_operations_dotl = { const struct inode_operations v9fs_symlink_inode_operations_dotl = { .readlink = generic_readlink, .follow_link = v9fs_vfs_follow_link_dotl, - .put_link = v9fs_vfs_put_link, + .put_link = kfree_put_link, .getattr = v9fs_vfs_getattr_dotl, .setattr = v9fs_vfs_setattr_dotl, .setxattr = generic_setxattr, |