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Clear caches when opening and closing devices

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This should fix problems with cache aliases in the kernel
This commit is contained in:
Chris Mason 2013-02-01 10:44:22 -05:00
parent 6cd836d7d9
commit 8fe354744c
2 changed files with 9 additions and 0 deletions

7
disk-io.c
View File

@ -641,6 +641,9 @@ static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
if (sb_bytenr == 0) if (sb_bytenr == 0)
sb_bytenr = BTRFS_SUPER_INFO_OFFSET; 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, ret = btrfs_scan_one_device(fp, path, &fs_devices,
&total_devs, sb_bytenr); &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 = &fs_info->fs_devices->devices;
list_for_each(next, list) { list_for_each(next, list) {
device = list_entry(next, struct btrfs_device, dev_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); close(device->fd);
} }
return 0; return 0;

2
volumes.c
View File

@ -176,6 +176,8 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, int flags)
goto fail; goto fail;
} }
posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED);
if (device->devid == fs_devices->latest_devid) if (device->devid == fs_devices->latest_devid)
fs_devices->latest_bdev = fd; fs_devices->latest_bdev = fd;
if (device->devid == fs_devices->lowest_devid) if (device->devid == fs_devices->lowest_devid)