diff options
Diffstat (limited to 'fs/proc/proc_sysctl.c')
-rw-r--r-- | fs/proc/proc_sysctl.c | 78 |
1 files changed, 31 insertions, 47 deletions
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index ac05f33..7129046 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -573,12 +573,12 @@ out: return ret; } -static int proc_sys_fill_cache(struct file *filp, void *dirent, - filldir_t filldir, +static bool proc_sys_fill_cache(struct file *file, + struct dir_context *ctx, struct ctl_table_header *head, struct ctl_table *table) { - struct dentry *child, *dir = filp->f_path.dentry; + struct dentry *child, *dir = file->f_path.dentry; struct inode *inode; struct qstr qname; ino_t ino = 0; @@ -595,38 +595,38 @@ static int proc_sys_fill_cache(struct file *filp, void *dirent, inode = proc_sys_make_inode(dir->d_sb, head, table); if (!inode) { dput(child); - return -ENOMEM; + return false; } else { d_set_d_op(child, &proc_sys_dentry_operations); d_add(child, inode); } } else { - return -ENOMEM; + return false; } } inode = child->d_inode; ino = inode->i_ino; type = inode->i_mode >> 12; dput(child); - return !!filldir(dirent, qname.name, qname.len, filp->f_pos, ino, type); + return dir_emit(ctx, qname.name, qname.len, ino, type); } -static int proc_sys_link_fill_cache(struct file *filp, void *dirent, - filldir_t filldir, +static bool proc_sys_link_fill_cache(struct file *file, + struct dir_context *ctx, struct ctl_table_header *head, struct ctl_table *table) { - int err, ret = 0; + bool ret = true; head = sysctl_head_grab(head); if (S_ISLNK(table->mode)) { /* It is not an error if we can not follow the link ignore it */ - err = sysctl_follow_link(&head, &table, current->nsproxy); + int err = sysctl_follow_link(&head, &table, current->nsproxy); if (err) goto out; } - ret = proc_sys_fill_cache(filp, dirent, filldir, head, table); + ret = proc_sys_fill_cache(file, ctx, head, table); out: sysctl_head_finish(head); return ret; @@ -634,67 +634,50 @@ out: static int scan(struct ctl_table_header *head, ctl_table *table, unsigned long *pos, struct file *file, - void *dirent, filldir_t filldir) + struct dir_context *ctx) { - int res; + bool res; - if ((*pos)++ < file->f_pos) - return 0; + if ((*pos)++ < ctx->pos) + return true; if (unlikely(S_ISLNK(table->mode))) - res = proc_sys_link_fill_cache(file, dirent, filldir, head, table); + res = proc_sys_link_fill_cache(file, ctx, head, table); else - res = proc_sys_fill_cache(file, dirent, filldir, head, table); + res = proc_sys_fill_cache(file, ctx, head, table); - if (res == 0) - file->f_pos = *pos; + if (res) + ctx->pos = *pos; return res; } -static int proc_sys_readdir(struct file *filp, void *dirent, filldir_t filldir) +static int proc_sys_readdir(struct file *file, struct dir_context *ctx) { - struct dentry *dentry = filp->f_path.dentry; - struct inode *inode = dentry->d_inode; - struct ctl_table_header *head = grab_header(inode); + struct ctl_table_header *head = grab_header(file_inode(file)); struct ctl_table_header *h = NULL; struct ctl_table *entry; struct ctl_dir *ctl_dir; unsigned long pos; - int ret = -EINVAL; if (IS_ERR(head)) return PTR_ERR(head); ctl_dir = container_of(head, struct ctl_dir, header); - ret = 0; - /* Avoid a switch here: arm builds fail with missing __cmpdi2 */ - if (filp->f_pos == 0) { - if (filldir(dirent, ".", 1, filp->f_pos, - inode->i_ino, DT_DIR) < 0) - goto out; - filp->f_pos++; - } - if (filp->f_pos == 1) { - if (filldir(dirent, "..", 2, filp->f_pos, - parent_ino(dentry), DT_DIR) < 0) - goto out; - filp->f_pos++; - } + if (!dir_emit_dots(file, ctx)) + return 0; + pos = 2; for (first_entry(ctl_dir, &h, &entry); h; next_entry(&h, &entry)) { - ret = scan(h, entry, &pos, filp, dirent, filldir); - if (ret) { + if (!scan(h, entry, &pos, file, ctx)) { sysctl_head_finish(h); break; } } - ret = 1; -out: sysctl_head_finish(head); - return ret; + return 0; } static int proc_sys_permission(struct inode *inode, int mask) @@ -769,7 +752,7 @@ static const struct file_operations proc_sys_file_operations = { static const struct file_operations proc_sys_dir_file_operations = { .read = generic_read_dir, - .readdir = proc_sys_readdir, + .iterate = proc_sys_readdir, .llseek = generic_file_llseek, }; @@ -813,15 +796,16 @@ static int sysctl_is_seen(struct ctl_table_header *p) return res; } -static int proc_sys_compare(const struct dentry *parent, - const struct inode *pinode, - const struct dentry *dentry, const struct inode *inode, +static int proc_sys_compare(const struct dentry *parent, const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { struct ctl_table_header *head; + struct inode *inode; + /* Although proc doesn't have negative dentries, rcu-walk means * that inode here can be NULL */ /* AV: can it, indeed? */ + inode = ACCESS_ONCE(dentry->d_inode); if (!inode) return 1; if (name->len != len) |