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Subject[PATCH 22/23] vfs: Teach fadvice to file_hotplug_lock
From: Eric W. Biederman <ebiederm@maxwell.aristanetworks.com>

Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
---
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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