shaba/lvm2
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Allow offline extension of snapshot volumes.

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NB Requires kernel patch that is not upstream.
This commit is contained in:
Alasdair Kergon 2005-04-07 12:17:46 +00:00
parent 367b9cb1f5
commit 864de9cee1
4 changed files with 47 additions and 11 deletions
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3
WHATS_NEW
View File

@ -1,7 +1,8 @@
Version 2.01.10 -
================================
Allow offline extension of snapshot volumes.
Move from 2-step to 3-step on-disk metadata commit.
Scan ramdisks too.
Scan ramdisks too and allow non-O_DIRECT fallback.
Annotate, tidy and extend list.h.
Alignment tidying.

29
lib/device/dev-io.c
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@ -330,8 +330,13 @@ int dev_open_flags(struct device *dev, int flags, int direct, int quiet)
}
#ifdef O_DIRECT_SUPPORT
if (direct)
flags |= O_DIRECT;
if (direct) {
if (!(dev->flags & DEV_O_DIRECT_TESTED))
dev->flags |= DEV_O_DIRECT;
if ((dev->flags & DEV_O_DIRECT))
flags |= O_DIRECT;
}
#endif
#ifdef O_NOATIME
@ -341,6 +346,16 @@ int dev_open_flags(struct device *dev, int flags, int direct, int quiet)
#endif
if ((dev->fd = open(name, flags, 0777)) < 0) {
#ifdef O_DIRECT_SUPPORT
if (direct && !(dev->flags & DEV_O_DIRECT_TESTED)) {
flags &= ~O_DIRECT;
if ((dev->fd = open(name, flags, 0777)) >= 0) {
dev->flags &= ~DEV_O_DIRECT;
log_debug("%s: Not using O_DIRECT", name);
goto opened;
}
}
#endif
if (quiet)
log_sys_debug("open", name);
else
@ -348,8 +363,13 @@ int dev_open_flags(struct device *dev, int flags, int direct, int quiet)
return 0;
}
opened:
dev->open_count++;
dev->flags &= ~DEV_ACCESSED_W;
#ifdef O_DIRECT_SUPPORT
if (direct)
dev->flags |= DEV_O_DIRECT_TESTED;
#endif
if ((flags & O_ACCMODE) == O_RDWR)
dev->flags |= DEV_OPENED_RW;
else
@ -373,8 +393,9 @@ int dev_open_flags(struct device *dev, int flags, int direct, int quiet)
list_add(&_open_devices, &dev->open_list);
log_debug("Opened %s %s", dev_name(dev),
dev->flags & DEV_OPENED_RW ? "RW" : "RO");
log_debug("Opened %s %s%s", dev_name(dev),
dev->flags & DEV_OPENED_RW ? "RW" : "RO",
dev->flags & DEV_O_DIRECT ? " O_DIRECT" : "");
return 1;
}

4
lib/device/device.h
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@ -23,6 +23,8 @@
#define DEV_REGULAR 0x00000002 /* Regular file? */
#define DEV_ALLOCED 0x00000004 /* dbg_malloc used */
#define DEV_OPENED_RW 0x00000008 /* Opened RW */
#define DEV_O_DIRECT 0x00000010 /* Use O_DIRECT */
#define DEV_O_DIRECT_TESTED 0x00000020 /* DEV_O_DIRECT is reliable */
/*
* All devices in LVM will be represented by one of these.
@ -64,7 +66,7 @@ int dev_get_sectsize(struct device *dev, uint32_t *size);
/* Use quiet version if device number could change e.g. when opening LV */
int dev_open(struct device *dev);
int dev_open_quiet(struct device *dev);
int dev_open_flags(struct device *dev, int flags, int append, int quiet);
int dev_open_flags(struct device *dev, int flags, int direct, int quiet);
int dev_close(struct device *dev);
int dev_close_immediate(struct device *dev);
void dev_close_all(void);

22
tools/lvresize.c
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@ -180,11 +180,6 @@ static int _lvresize(struct cmd_context *cmd, struct lvresize_params *lp)
return ECMD_FAILED;
}
if (lv_is_origin(lv)) {
log_error("Snapshot origin volumes cannot be resized yet.");
return ECMD_FAILED;
}
alloc = (alloc_policy_t) arg_uint_value(cmd, alloc_ARG, lv->alloc);
if (lp->size) {
@ -352,6 +347,23 @@ static int _lvresize(struct cmd_context *cmd, struct lvresize_params *lp)
lp->resize = LV_EXTEND;
}
if (lv_is_origin(lv)) {
if (lp->resize == LV_REDUCE) {
log_error("Snapshot origin volumes cannot be reduced "
"in size yet.");
return ECMD_FAILED;
}
memset(&info, 0, sizeof(info));
if (lv_info(lv, &info, 0) && info.exists) {
log_error("Snapshot origin volumes can be resized "
"only while inactive: try lvchange -an");
return ECMD_FAILED;
}
}
if (lp->resize == LV_REDUCE) {
if (lp->argc)
log_print("Ignoring PVs on command line when reducing");