diff options
| author | Alasdair G Kergon <agk@redhat.com> | 2006-01-06 00:20:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:34:01 -0800 |
| commit | 6da487dcc0c6f4c827779687a20016efeffc4d60 (patch) | |
| tree | 824d14e18cbb81bf45c6d17104993acfa47c9c36 | |
| parent | aa8d7c2fbe619d8c0837296d2eaf4c14cebac198 (diff) | |
[PATCH] device-mapper ioctl: add skip lock_fs flag
Add ioctl DM_SKIP_LOCKFS_FLAG for userspace to request that lock_fs is
bypassed when suspending a device.
There's no change to the behaviour of existing code that doesn't know about
the new flag.
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | drivers/md/dm-ioctl.c | 11 | ||||
| -rw-r--r-- | include/linux/dm-ioctl.h | 11 |
2 files changed, 17 insertions, 5 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index dbc07afd446..561bda5011e 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -693,14 +693,18 @@ static int dev_rename(struct dm_ioctl *param, size_t param_size) static int do_suspend(struct dm_ioctl *param) { int r = 0; + int do_lockfs = 1; struct mapped_device *md; md = find_device(param); if (!md) return -ENXIO; + if (param->flags & DM_SKIP_LOCKFS_FLAG) + do_lockfs = 0; + if (!dm_suspended(md)) - r = dm_suspend(md, 1); + r = dm_suspend(md, do_lockfs); if (!r) r = __dev_status(md, param); @@ -712,6 +716,7 @@ static int do_suspend(struct dm_ioctl *param) static int do_resume(struct dm_ioctl *param) { int r = 0; + int do_lockfs = 1; struct hash_cell *hc; struct mapped_device *md; struct dm_table *new_map; @@ -737,8 +742,10 @@ static int do_resume(struct dm_ioctl *param) /* Do we need to load a new map ? */ if (new_map) { /* Suspend if it isn't already suspended */ + if (param->flags & DM_SKIP_LOCKFS_FLAG) + do_lockfs = 0; if (!dm_suspended(md)) - dm_suspend(md, 1); + dm_suspend(md, do_lockfs); r = dm_swap_table(md, new_map); if (r) { diff --git a/include/linux/dm-ioctl.h b/include/linux/dm-ioctl.h index f5eb6b6cd10..fa75ba0d635 100644 --- a/include/linux/dm-ioctl.h +++ b/include/linux/dm-ioctl.h @@ -272,9 +272,9 @@ typedef char ioctl_struct[308]; #define DM_TARGET_MSG _IOWR(DM_IOCTL, DM_TARGET_MSG_CMD, struct dm_ioctl) #define DM_VERSION_MAJOR 4 -#define DM_VERSION_MINOR 4 +#define DM_VERSION_MINOR 5 #define DM_VERSION_PATCHLEVEL 0 -#define DM_VERSION_EXTRA "-ioctl (2005-01-12)" +#define DM_VERSION_EXTRA "-ioctl (2005-10-04)" /* Status bits */ #define DM_READONLY_FLAG (1 << 0) /* In/Out */ @@ -301,8 +301,13 @@ typedef char ioctl_struct[308]; #define DM_BUFFER_FULL_FLAG (1 << 8) /* Out */ /* - * Set this to improve performance when you aren't going to use open_count + * Set this to improve performance when you aren't going to use open_count. */ #define DM_SKIP_BDGET_FLAG (1 << 9) /* In */ +/* + * Set this to avoid attempting to freeze any filesystem when suspending. + */ +#define DM_SKIP_LOCKFS_FLAG (1 << 10) /* In */ + #endif /* _LINUX_DM_IOCTL_H */ |