[PATCH 22/23] vfs: Teach fadvice to file_hotplug_lock

[Eric W. Biederman]

From: Eric W. Biederman <ebiederm@xxxxxxxxxxxxxxxxxxxxxxxxxx>

Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxxxxxxxx>
---
 mm/fadvise.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/mm/fadvise.c b/mm/fadvise.c
index 54a0f80..d7f1fba 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -38,6 +38,11 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
 	if (!file)
 		return -EBADF;
 
+	ret = -EIO;
+	if (!file_hotplug_read_trylock(file))
+		goto out_fput;
+
+	ret = 0;
 	if (S_ISFIFO(file->f_path.dentry->d_inode->i_mode)) {
 		ret = -ESPIPE;
 		goto out;
@@ -123,6 +128,8 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
 		ret = -EINVAL;
 	}
 out:
+	file_hotplug_read_unlock(file);
+out_fput:
 	fput(file);
 	return ret;
 }
-- 
1.6.3.1.54.g99dd.dirty

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