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Code Releases Activity

Fix vgcreate race which could allow two parallel vgcreates to succeed,

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with the second vgcreate overwriting the first.

Obtain lock before calling vg_create(), which checks for existence of vgname
and fails if it already exists.
This commit is contained in:
Dave Wysochanski 2008-12-01 20:14:33 +00:00
parent 89ef434fe0
commit 9d9589d173
2 changed files with 23 additions and 21 deletions
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1
WHATS_NEW
View File

@ -1,5 +1,6 @@
Version 2.02.44 -
====================================
Fix race in vgcreate that would result in second caller overwriting first.
Fix uninitialised lv_count in vgdisplay -c.
Don't skip updating pvid hash when lvmcache_info struct got swapped.
Add tinfo to termcap search path for pld-linux.

43
tools/vgcreate.c
View File

@ -46,11 +46,22 @@ int vgcreate(struct cmd_context *cmd, int argc, char **argv)
if (validate_vg_create_params(cmd, &vp_new))
return EINVALID_CMD_LINE;
if (!lock_vol(cmd, VG_ORPHANS, LCK_VG_WRITE)) {
log_error("Can't get lock for orphan PVs");
return ECMD_FAILED;
}
if (!lock_vol(cmd, vp_new.vg_name, LCK_VG_WRITE | LCK_NONBLOCK)) {
log_error("Can't get lock for %s", vp_new.vg_name);
unlock_vg(cmd, VG_ORPHANS);
return ECMD_FAILED;
}
/* Create the new VG */
if (!(vg = vg_create(cmd, vp_new.vg_name, vp_new.extent_size,
vp_new.max_pv, vp_new.max_lv, vp_new.alloc,
argc - 1, argv + 1)))
return ECMD_FAILED;
goto bad;
if (vp_new.max_lv != vg->max_lv)
log_warn("WARNING: Setting maxlogicalvolumes to %d "
@ -63,18 +74,18 @@ int vgcreate(struct cmd_context *cmd, int argc, char **argv)
if (arg_count(cmd, addtag_ARG)) {
if (!(tag = arg_str_value(cmd, addtag_ARG, NULL))) {
log_error("Failed to get tag");
return ECMD_FAILED;
goto bad;
}
if (!(vg->fid->fmt->features & FMT_TAGS)) {
log_error("Volume group format does not support tags");
return ECMD_FAILED;
goto bad;
}
if (!str_list_add(cmd->mem, &vg->tags, tag)) {
log_error("Failed to add tag %s to volume group %s",
tag, vp_new.vg_name);
return ECMD_FAILED;
goto bad;
}
}
@ -88,28 +99,13 @@ int vgcreate(struct cmd_context *cmd, int argc, char **argv)
clustered_message = "Non-clustered ";
}
if (!lock_vol(cmd, VG_ORPHANS, LCK_VG_WRITE)) {
log_error("Can't get lock for orphan PVs");
return ECMD_FAILED;
}
if (!lock_vol(cmd, vp_new.vg_name, LCK_VG_WRITE | LCK_NONBLOCK)) {
log_error("Can't get lock for %s", vp_new.vg_name);
unlock_vg(cmd, VG_ORPHANS);
return ECMD_FAILED;
}
if (!archive(vg)) {
unlock_vg(cmd, vp_new.vg_name);
unlock_vg(cmd, VG_ORPHANS);
return ECMD_FAILED;
goto bad;
}
/* Store VG on disk(s) */
if (!vg_write(vg) || !vg_commit(vg)) {
unlock_vg(cmd, vp_new.vg_name);
unlock_vg(cmd, VG_ORPHANS);
return ECMD_FAILED;
goto bad;
}
unlock_vg(cmd, vp_new.vg_name);
@ -121,4 +117,9 @@ int vgcreate(struct cmd_context *cmd, int argc, char **argv)
clustered_message, *clustered_message ? 'v' : 'V', vg->name);
return ECMD_PROCESSED;
bad:
unlock_vg(cmd, vp_new.vg_name);
unlock_vg(cmd, VG_ORPHANS);
return ECMD_FAILED;
}