From 8fe354744cd7b5c4f7a3314dcdbb5095192a032f Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Fri, 1 Feb 2013 10:44:22 -0500 Subject: Clear caches when opening and closing devices This should fix problems with cache aliases in the kernel --- disk-io.c | 7 +++++++ volumes.c | 2 ++ 2 files changed, 9 insertions(+) diff --git a/disk-io.c b/disk-io.c index c4d4631d..f00fe4e7 100644 --- a/disk-io.c +++ b/disk-io.c @@ -641,6 +641,9 @@ static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path, if (sb_bytenr == 0) sb_bytenr = BTRFS_SUPER_INFO_OFFSET; + /* try to drop all the caches */ + posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED); + ret = btrfs_scan_one_device(fp, path, &fs_devices, &total_devs, sb_bytenr); @@ -1091,6 +1094,10 @@ static int close_all_devices(struct btrfs_fs_info *fs_info) list = &fs_info->fs_devices->devices; list_for_each(next, list) { device = list_entry(next, struct btrfs_device, dev_list); + if (device->fd) { + fsync(device->fd); + posix_fadvise(device->fd, 0, 0, POSIX_FADV_DONTNEED); + } close(device->fd); } return 0; diff --git a/volumes.c b/volumes.c index 581c298f..f3371b22 100644 --- a/volumes.c +++ b/volumes.c @@ -176,6 +176,8 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, int flags) goto fail; } + posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED); + if (device->devid == fs_devices->latest_devid) fs_devices->latest_bdev = fd; if (device->devid == fs_devices->lowest_devid) -- cgit v1.2.3