Hello, This patch series does two things: - adds allocation helpers for struct btrfs_device and struct btrfs_fs_devices so that all the list_heads, spinlocks, etc are properly initialized and the code for that is in one place; - fixes a bug in the umount sequence, which, under certain conditions, can lead to mount failures. This is on top of 3.11-rc3, but applies cleanly to btrfs-next/master as of now. You can pull from: git://github.com/idryomov/btrfs-unstable.git dev-fixes Thanks, Ilya Ilya Dryomov (4): Btrfs: find_next_devid: root -> fs_info Btrfs: add btrfs_alloc_device and switch to it Btrfs: add alloc_fs_devices and switch to it Btrfs: rollback btrfs_device fields on umount fs/btrfs/volumes.c | 250 +++++++++++++++++++++++++++++++++------------------- fs/btrfs/volumes.h | 3 + 2 files changed, 162 insertions(+), 91 deletions(-) -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
find_next_devid() knows which root to search, so it should take an
fs_info instead of an arbitrary root.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
fs/btrfs/volumes.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 78b8717..ae1bcb0 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1307,15 +1307,14 @@ static u64 find_next_chunk(struct btrfs_fs_info
*fs_info)
return ret;
}
-static noinline int find_next_devid(struct btrfs_root *root, u64 *objectid)
+static noinline int find_next_devid(struct btrfs_fs_info *fs_info,
+ u64 *devid_ret)
{
int ret;
struct btrfs_key key;
struct btrfs_key found_key;
struct btrfs_path *path;
- root = root->fs_info->chunk_root;
-
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
@@ -1324,20 +1323,21 @@ static noinline int find_next_devid(struct btrfs_root
*root, u64 *objectid)
key.type = BTRFS_DEV_ITEM_KEY;
key.offset = (u64)-1;
- ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ ret = btrfs_search_slot(NULL, fs_info->chunk_root, &key, path, 0, 0);
if (ret < 0)
goto error;
BUG_ON(ret == 0); /* Corruption */
- ret = btrfs_previous_item(root, path, BTRFS_DEV_ITEMS_OBJECTID,
+ ret = btrfs_previous_item(fs_info->chunk_root, path,
+ BTRFS_DEV_ITEMS_OBJECTID,
BTRFS_DEV_ITEM_KEY);
if (ret) {
- *objectid = 1;
+ *devid_ret = 1;
} else {
btrfs_item_key_to_cpu(path->nodes[0], &found_key,
path->slots[0]);
- *objectid = found_key.offset + 1;
+ *devid_ret = found_key.offset + 1;
}
ret = 0;
error:
@@ -1971,7 +1971,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char
*device_path)
}
rcu_assign_pointer(device->name, name);
- ret = find_next_devid(root, &device->devid);
+ ret = find_next_devid(root->fs_info, &device->devid);
if (ret) {
rcu_string_free(device->name);
kfree(device);
--
1.7.10.4
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Ilya Dryomov
2013-Aug-12 11:33 UTC
[PATCH 2/4] Btrfs: add btrfs_alloc_device and switch to it
Currently btrfs_device is allocated ad-hoc in a few different places,
and as a result not all fields are initialized properly. In particular,
readahead state is only initialized in device_list_add (at scan time),
and not in btrfs_init_new_device (when the new device is added with
''btrfs dev add''). Fix this by adding an allocation helper and
switch
everybody but __btrfs_close_devices to it. (__btrfs_close_devices is
dealt with in a later commit.)
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
fs/btrfs/volumes.c | 150 ++++++++++++++++++++++++++++++++--------------------
fs/btrfs/volumes.h | 3 ++
2 files changed, 96 insertions(+), 57 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ae1bcb0..fe52704 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -101,6 +101,27 @@ void btrfs_cleanup_fs_uuids(void)
}
}
+static struct btrfs_device *__alloc_device(void)
+{
+ struct btrfs_device *dev;
+
+ dev = kzalloc(sizeof(*dev), GFP_NOFS);
+ if (!dev)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&dev->dev_list);
+ INIT_LIST_HEAD(&dev->dev_alloc_list);
+
+ spin_lock_init(&dev->io_lock);
+
+ spin_lock_init(&dev->reada_lock);
+ atomic_set(&dev->reada_in_flight, 0);
+ INIT_RADIX_TREE(&dev->reada_zones, GFP_NOFS & ~__GFP_WAIT);
+ INIT_RADIX_TREE(&dev->reada_extents, GFP_NOFS & ~__GFP_WAIT);
+
+ return dev;
+}
+
static noinline struct btrfs_device *__find_device(struct list_head *head,
u64 devid, u8 *uuid)
{
@@ -414,17 +435,12 @@ static noinline int device_list_add(const char *path,
if (fs_devices->opened)
return -EBUSY;
- device = kzalloc(sizeof(*device), GFP_NOFS);
- if (!device) {
+ device = btrfs_alloc_device(NULL, &devid,
+ disk_super->dev_item.uuid);
+ if (IS_ERR(device)) {
/* we can safely leave the fs_devices entry around */
- return -ENOMEM;
+ return PTR_ERR(device);
}
- device->devid = devid;
- device->dev_stats_valid = 0;
- device->work.func = pending_bios_fn;
- memcpy(device->uuid, disk_super->dev_item.uuid,
- BTRFS_UUID_SIZE);
- spin_lock_init(&device->io_lock);
name = rcu_string_strdup(path, GFP_NOFS);
if (!name) {
@@ -432,15 +448,6 @@ static noinline int device_list_add(const char *path,
return -ENOMEM;
}
rcu_assign_pointer(device->name, name);
- INIT_LIST_HEAD(&device->dev_alloc_list);
-
- /* init readahead state */
- spin_lock_init(&device->reada_lock);
- device->reada_curr_zone = NULL;
- atomic_set(&device->reada_in_flight, 0);
- device->reada_next = 0;
- INIT_RADIX_TREE(&device->reada_zones, GFP_NOFS & ~__GFP_WAIT);
- INIT_RADIX_TREE(&device->reada_extents, GFP_NOFS & ~__GFP_WAIT);
mutex_lock(&fs_devices->device_list_mutex);
list_add_rcu(&device->dev_list, &fs_devices->devices);
@@ -491,8 +498,9 @@ static struct btrfs_fs_devices *clone_fs_devices(struct
btrfs_fs_devices *orig)
list_for_each_entry(orig_dev, &orig->devices, dev_list) {
struct rcu_string *name;
- device = kzalloc(sizeof(*device), GFP_NOFS);
- if (!device)
+ device = btrfs_alloc_device(NULL, &orig_dev->devid,
+ orig_dev->uuid);
+ if (IS_ERR(device))
goto error;
/*
@@ -506,13 +514,6 @@ static struct btrfs_fs_devices *clone_fs_devices(struct
btrfs_fs_devices *orig)
}
rcu_assign_pointer(device->name, name);
- device->devid = orig_dev->devid;
- device->work.func = pending_bios_fn;
- memcpy(device->uuid, orig_dev->uuid, sizeof(device->uuid));
- spin_lock_init(&device->io_lock);
- INIT_LIST_HEAD(&device->dev_list);
- INIT_LIST_HEAD(&device->dev_alloc_list);
-
list_add(&device->dev_list, &fs_devices->devices);
device->fs_devices = fs_devices;
fs_devices->num_devices++;
@@ -1956,10 +1957,10 @@ int btrfs_init_new_device(struct btrfs_root *root, char
*device_path)
}
mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
- device = kzalloc(sizeof(*device), GFP_NOFS);
- if (!device) {
+ device = btrfs_alloc_device(root->fs_info, NULL, NULL);
+ if (IS_ERR(device)) {
/* we can safely leave the fs_devices entry around */
- ret = -ENOMEM;
+ ret = PTR_ERR(device);
goto error;
}
@@ -1971,13 +1972,6 @@ int btrfs_init_new_device(struct btrfs_root *root, char
*device_path)
}
rcu_assign_pointer(device->name, name);
- ret = find_next_devid(root->fs_info, &device->devid);
- if (ret) {
- rcu_string_free(device->name);
- kfree(device);
- goto error;
- }
-
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
rcu_string_free(device->name);
@@ -1992,9 +1986,6 @@ int btrfs_init_new_device(struct btrfs_root *root, char
*device_path)
if (blk_queue_discard(q))
device->can_discard = 1;
device->writeable = 1;
- device->work.func = pending_bios_fn;
- generate_random_uuid(device->uuid);
- spin_lock_init(&device->io_lock);
device->generation = trans->transid;
device->io_width = root->sectorsize;
device->io_align = root->sectorsize;
@@ -2142,9 +2133,9 @@ int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root,
char *device_path,
}
}
- device = kzalloc(sizeof(*device), GFP_NOFS);
- if (!device) {
- ret = -ENOMEM;
+ device = btrfs_alloc_device(NULL, BTRFS_DEV_REPLACE_DEVID, NULL);
+ if (IS_ERR(device)) {
+ ret = PTR_ERR(device);
goto error;
}
@@ -2161,10 +2152,6 @@ int btrfs_init_dev_replace_tgtdev(struct btrfs_root
*root, char *device_path,
device->can_discard = 1;
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
device->writeable = 1;
- device->work.func = pending_bios_fn;
- generate_random_uuid(device->uuid);
- device->devid = BTRFS_DEV_REPLACE_DEVID;
- spin_lock_init(&device->io_lock);
device->generation = 0;
device->io_width = root->sectorsize;
device->io_align = root->sectorsize;
@@ -5314,23 +5301,72 @@ static struct btrfs_device *add_missing_dev(struct
btrfs_root *root,
struct btrfs_device *device;
struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
- device = kzalloc(sizeof(*device), GFP_NOFS);
- if (!device)
+ device = btrfs_alloc_device(NULL, &devid, dev_uuid);
+ if (IS_ERR(device))
return NULL;
- list_add(&device->dev_list,
- &fs_devices->devices);
- device->devid = devid;
- device->work.func = pending_bios_fn;
+
+ list_add(&device->dev_list, &fs_devices->devices);
device->fs_devices = fs_devices;
- device->missing = 1;
fs_devices->num_devices++;
+
+ device->missing = 1;
fs_devices->missing_devices++;
- spin_lock_init(&device->io_lock);
- INIT_LIST_HEAD(&device->dev_alloc_list);
- memcpy(device->uuid, dev_uuid, BTRFS_UUID_SIZE);
+
return device;
}
+/**
+ * btrfs_alloc_device - allocate struct btrfs_device
+ * @fs_info: used only for generating a new devid, can be NULL if
+ * devid is provided (i.e. @devid != NULL).
+ * @devid: a pointer to devid for this device. If NULL a new devid
+ * is generated.
+ * @uuid: a pointer to UUID for this device. If NULL a new UUID
+ * is generated.
+ *
+ * Return: a pointer to a new &struct btrfs_device on success; ERR_PTR()
+ * on error. Returned struct is not linked onto any lists and can be
+ * destroyed with kfree() right away.
+ */
+struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
+ const u64 *devid,
+ const u8 *uuid)
+{
+ struct btrfs_device *dev;
+ u64 tmp;
+
+ if (!devid && !fs_info) {
+ WARN_ON(1);
+ return ERR_PTR(-EINVAL);
+ }
+
+ dev = __alloc_device();
+ if (IS_ERR(dev))
+ return dev;
+
+ if (devid)
+ tmp = *devid;
+ else {
+ int ret;
+
+ ret = find_next_devid(fs_info, &tmp);
+ if (ret) {
+ kfree(dev);
+ return ERR_PTR(ret);
+ }
+ }
+ dev->devid = tmp;
+
+ if (uuid)
+ memcpy(dev->uuid, uuid, BTRFS_UUID_SIZE);
+ else
+ generate_random_uuid(dev->uuid);
+
+ dev->work.func = pending_bios_fn;
+
+ return dev;
+}
+
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk)
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 8670558..5706cd8 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -298,6 +298,9 @@ void btrfs_close_extra_devices(struct btrfs_fs_info
*fs_info,
int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
char *device_path,
struct btrfs_device **device);
+struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
+ const u64 *devid,
+ const u8 *uuid);
int btrfs_rm_device(struct btrfs_root *root, char *device_path);
void btrfs_cleanup_fs_uuids(void);
int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len);
--
1.7.10.4
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Ilya Dryomov
2013-Aug-12 11:33 UTC
[PATCH 3/4] Btrfs: add alloc_fs_devices and switch to it
In the spirit of btrfs_alloc_device, add a helper for allocating and
doing some common initialization of btrfs_fs_devices struct.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
fs/btrfs/volumes.c | 71 +++++++++++++++++++++++++++++++++++++++-------------
1 file changed, 53 insertions(+), 18 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index fe52704..af17b17 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -62,6 +62,48 @@ static void unlock_chunks(struct btrfs_root *root)
mutex_unlock(&root->fs_info->chunk_mutex);
}
+static struct btrfs_fs_devices *__alloc_fs_devices(void)
+{
+ struct btrfs_fs_devices *fs_devs;
+
+ fs_devs = kzalloc(sizeof(*fs_devs), GFP_NOFS);
+ if (!fs_devs)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&fs_devs->device_list_mutex);
+
+ INIT_LIST_HEAD(&fs_devs->devices);
+ INIT_LIST_HEAD(&fs_devs->alloc_list);
+ INIT_LIST_HEAD(&fs_devs->list);
+
+ return fs_devs;
+}
+
+/**
+ * alloc_fs_devices - allocate struct btrfs_fs_devices
+ * @fsid: a pointer to UUID for this FS. If NULL a new UUID is
+ * generated.
+ *
+ * Return: a pointer to a new &struct btrfs_fs_devices on success;
+ * ERR_PTR() on error. Returned struct is not linked onto any lists and
+ * can be destroyed with kfree() right away.
+ */
+static struct btrfs_fs_devices *alloc_fs_devices(const u8 *fsid)
+{
+ struct btrfs_fs_devices *fs_devs;
+
+ fs_devs = __alloc_fs_devices();
+ if (IS_ERR(fs_devs))
+ return fs_devs;
+
+ if (fsid)
+ memcpy(fs_devs->fsid, fsid, BTRFS_FSID_SIZE);
+ else
+ generate_random_uuid(fs_devs->fsid);
+
+ return fs_devs;
+}
+
static void free_fs_devices(struct btrfs_fs_devices *fs_devices)
{
struct btrfs_device *device;
@@ -416,16 +458,14 @@ static noinline int device_list_add(const char *path,
fs_devices = find_fsid(disk_super->fsid);
if (!fs_devices) {
- fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
- if (!fs_devices)
- return -ENOMEM;
- INIT_LIST_HEAD(&fs_devices->devices);
- INIT_LIST_HEAD(&fs_devices->alloc_list);
+ fs_devices = alloc_fs_devices(disk_super->fsid);
+ if (IS_ERR(fs_devices))
+ return PTR_ERR(fs_devices);
+
list_add(&fs_devices->list, &fs_uuids);
- memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
fs_devices->latest_devid = devid;
fs_devices->latest_trans = found_transid;
- mutex_init(&fs_devices->device_list_mutex);
+
device = NULL;
} else {
device = __find_device(&fs_devices->devices, devid,
@@ -481,18 +521,13 @@ static struct btrfs_fs_devices *clone_fs_devices(struct
btrfs_fs_devices *orig)
struct btrfs_device *device;
struct btrfs_device *orig_dev;
- fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
- if (!fs_devices)
- return ERR_PTR(-ENOMEM);
+ fs_devices = alloc_fs_devices(orig->fsid);
+ if (IS_ERR(fs_devices))
+ return fs_devices;
- INIT_LIST_HEAD(&fs_devices->devices);
- INIT_LIST_HEAD(&fs_devices->alloc_list);
- INIT_LIST_HEAD(&fs_devices->list);
- mutex_init(&fs_devices->device_list_mutex);
fs_devices->latest_devid = orig->latest_devid;
fs_devices->latest_trans = orig->latest_trans;
fs_devices->total_devices = orig->total_devices;
- memcpy(fs_devices->fsid, orig->fsid, sizeof(fs_devices->fsid));
/* We have held the volume lock, it is safe to get the devices. */
list_for_each_entry(orig_dev, &orig->devices, dev_list) {
@@ -1794,9 +1829,9 @@ static int btrfs_prepare_sprout(struct btrfs_root *root)
if (!fs_devices->seeding)
return -EINVAL;
- seed_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
- if (!seed_devices)
- return -ENOMEM;
+ seed_devices = __alloc_fs_devices();
+ if (IS_ERR(seed_devices))
+ return PTR_ERR(seed_devices);
old_devices = clone_fs_devices(fs_devices);
if (IS_ERR(old_devices)) {
--
1.7.10.4
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Ilya Dryomov
2013-Aug-12 11:33 UTC
[PATCH 4/4] Btrfs: rollback btrfs_device fields on umount
It turns out we don''t properly rollback in-core btrfs_device state on
umount. We zero out ->bdev, ->in_fs_metadata and that''s about
it. In
particular, we don''t zero out ->generation, and this can lead to us
refusing a mount -- a non-NULL fs_devices->latest_bdev is essential, but
btrfs_close_extra_devices will happily assign NULL to ->latest_bdev if
the first device on the dev_list happens to be missing and consequently
has no bdev attached. This happens because since commit a6b0d5c8
btrfs_close_extra_devices adjusts ->latest_bdev, and in doing that,
relies on the ->generation. Fix this, and possibly other problems, by
zeroing out everything except for what device_list_add sets, so that a
mount right after insmod and ''btrfs dev scan'' is no different
from any
later mount in this respect.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
fs/btrfs/volumes.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index af17b17..2f6bc12 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -673,22 +673,19 @@ static int __btrfs_close_devices(struct btrfs_fs_devices
*fs_devices)
if (device->can_discard)
fs_devices->num_can_discard--;
- new_device = kmalloc(sizeof(*new_device), GFP_NOFS);
- BUG_ON(!new_device); /* -ENOMEM */
- memcpy(new_device, device, sizeof(*new_device));
+ new_device = btrfs_alloc_device(NULL, &device->devid,
+ device->uuid);
+ BUG_ON(IS_ERR(new_device)); /* -ENOMEM */
/* Safe because we are under uuid_mutex */
if (device->name) {
name = rcu_string_strdup(device->name->str, GFP_NOFS);
- BUG_ON(device->name && !name); /* -ENOMEM */
+ BUG_ON(!name); /* -ENOMEM */
rcu_assign_pointer(new_device->name, name);
}
- new_device->bdev = NULL;
- new_device->writeable = 0;
- new_device->in_fs_metadata = 0;
- new_device->can_discard = 0;
- spin_lock_init(&new_device->io_lock);
+
list_replace_rcu(&device->dev_list, &new_device->dev_list);
+ new_device->fs_devices = device->fs_devices;
call_rcu(&device->rcu, free_device);
}
--
1.7.10.4
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Stefan Behrens
2013-Aug-23 07:35 UTC
Re: [PATCH 2/4] Btrfs: add btrfs_alloc_device and switch to it
On Mon, 12 Aug 2013 14:33:02 +0300, Ilya Dryomov wrote:> Currently btrfs_device is allocated ad-hoc in a few different places, > and as a result not all fields are initialized properly. In particular, > readahead state is only initialized in device_list_add (at scan time), > and not in btrfs_init_new_device (when the new device is added with > ''btrfs dev add''). Fix this by adding an allocation helper and switch > everybody but __btrfs_close_devices to it. (__btrfs_close_devices is > dealt with in a later commit.) > > Signed-off-by: Ilya Dryomov <idryomov@gmail.com> > --- > fs/btrfs/volumes.c | 150 ++++++++++++++++++++++++++++++++-------------------- > fs/btrfs/volumes.h | 3 ++ > 2 files changed, 96 insertions(+), 57 deletions(-) > > diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c > index ae1bcb0..fe52704 100644 > --- a/fs/btrfs/volumes.c > +++ b/fs/btrfs/volumes.c[...]> @@ -2142,9 +2133,9 @@ int btrfs_init_dev_replace_tgtdev(struct btrfs_root *root, char *device_path, > } > } > > - device = kzalloc(sizeof(*device), GFP_NOFS); > - if (!device) { > - ret = -ENOMEM; > + device = btrfs_alloc_device(NULL, BTRFS_DEV_REPLACE_DEVID, NULL); > + if (IS_ERR(device)) { > + ret = PTR_ERR(device);BTRFS_DEV_REPLACE_DEVID is not a "const u64 *devid".> +struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info, > + const u64 *devid, > + const u8 *uuid) > +{ > + struct btrfs_device *dev; > + u64 tmp; > + > + if (!devid && !fs_info) { > + WARN_ON(1); > + return ERR_PTR(-EINVAL); > + }This WARN_ON(1) is triggered with the device replace procedure because BTRFS_DEV_REPLACE_DEVID is zero. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Ilya Dryomov
2013-Aug-23 08:57 UTC
Re: [PATCH 2/4] Btrfs: add btrfs_alloc_device and switch to it
On Fri, Aug 23, 2013 at 10:35 AM, Stefan Behrens <sbehrens@giantdisaster.de> wrote:> This WARN_ON(1) is triggered with the device replace procedure because > BTRFS_DEV_REPLACE_DEVID is zero.Ah, a dreaded 0 in C. What a screw up. This came from my rebuild branch where btrfs_init_dev_replace_tgtdev is a bit different, and I just auto-merged it. I''ll fix it up. Thanks, Ilya -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html