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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
commit863981e96738983919de841ec669e157e6bdaeb0 (patch)
treed6d89a12e7eb8017837c057935a2271290907f76 /fs/readdir.c
parent8dec7c70575785729a6a9e6719a955e9c545bcab (diff)
Linux-libre 4.7.1-gnupck-4.7.1-gnu
Diffstat (limited to 'fs/readdir.c')
-rw-r--r--fs/readdir.c41
1 files changed, 29 insertions, 12 deletions
diff --git a/fs/readdir.c b/fs/readdir.c
index e69ef3b79..9d0212c37 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -24,27 +24,40 @@
int iterate_dir(struct file *file, struct dir_context *ctx)
{
struct inode *inode = file_inode(file);
+ bool shared = false;
int res = -ENOTDIR;
- if (!file->f_op->iterate)
+ if (file->f_op->iterate_shared)
+ shared = true;
+ else if (!file->f_op->iterate)
goto out;
res = security_file_permission(file, MAY_READ);
if (res)
goto out;
- res = mutex_lock_killable(&inode->i_mutex);
- if (res)
- goto out;
+ if (shared) {
+ inode_lock_shared(inode);
+ } else {
+ res = down_write_killable(&inode->i_rwsem);
+ if (res)
+ goto out;
+ }
res = -ENOENT;
if (!IS_DEADDIR(inode)) {
ctx->pos = file->f_pos;
- res = file->f_op->iterate(file, ctx);
+ if (shared)
+ res = file->f_op->iterate_shared(file, ctx);
+ else
+ res = file->f_op->iterate(file, ctx);
file->f_pos = ctx->pos;
fsnotify_access(file);
file_accessed(file);
}
- inode_unlock(inode);
+ if (shared)
+ inode_unlock_shared(inode);
+ else
+ inode_unlock(inode);
out:
return res;
}
@@ -111,7 +124,7 @@ SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
struct old_linux_dirent __user *, dirent, unsigned int, count)
{
int error;
- struct fd f = fdget(fd);
+ struct fd f = fdget_pos(fd);
struct readdir_callback buf = {
.ctx.actor = fillonedir,
.dirent = dirent
@@ -124,7 +137,7 @@ SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
if (buf.result)
error = buf.result;
- fdput(f);
+ fdput_pos(f);
return error;
}
@@ -169,6 +182,8 @@ static int filldir(struct dir_context *ctx, const char *name, int namlen,
}
dirent = buf->previous;
if (dirent) {
+ if (signal_pending(current))
+ return -EINTR;
if (__put_user(offset, &dirent->d_off))
goto efault;
}
@@ -208,7 +223,7 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
if (!access_ok(VERIFY_WRITE, dirent, count))
return -EFAULT;
- f = fdget(fd);
+ f = fdget_pos(fd);
if (!f.file)
return -EBADF;
@@ -222,7 +237,7 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
else
error = count - buf.count;
}
- fdput(f);
+ fdput_pos(f);
return error;
}
@@ -248,6 +263,8 @@ static int filldir64(struct dir_context *ctx, const char *name, int namlen,
return -EINVAL;
dirent = buf->previous;
if (dirent) {
+ if (signal_pending(current))
+ return -EINTR;
if (__put_user(offset, &dirent->d_off))
goto efault;
}
@@ -289,7 +306,7 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
if (!access_ok(VERIFY_WRITE, dirent, count))
return -EFAULT;
- f = fdget(fd);
+ f = fdget_pos(fd);
if (!f.file)
return -EBADF;
@@ -304,6 +321,6 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
else
error = count - buf.count;
}
- fdput(f);
+ fdput_pos(f);
return error;
}