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While performing udev sync semaphore's inc/dec operation, we use the
result from GETVAL semctl just to print a debug message with current
value of that sempahore, nothing else.
If the GETVAL fails for whetever reason while the actual inc/dec
completes successfully, just log a warning message about the GETVAL
(and print the debug messages without the actual semaphore value)
and return success for the inc/dec operation as a whole.
Clean up udev sync semaphore on fail path during its creation, otherwise
the caller will have no handle returned to clean it up itself and the
semaphore will keep staying in the system. The only way to clean it up
would be to call `dmsetup udevcomplete_all` which would destroy all
udev sync semaphores, not just the failed one, which we don't want.
The same message is printed while performing create/inc/dec operation and
the GETVAL semctl fails. Add a prefix so we know exactly in which of
these functions the issue actually happened.
Kernels <2.6.27 don't have /sys/dev dir - add code for looking
out device name via longre seach in /sys/block
This makes commands like 'dmsetup dep -o blkdevname' working.
As we start refactoring the code to break dependencies (see doc/refactoring.txt),
I want us to use full paths in the includes (eg, #include "base/data-struct/list.h").
This makes it more obvious when we're breaking abstraction boundaries, eg, including a file in
metadata/ from base/
btrfs is using fake major:minor device numbers.
try to be smarter and detect used node via DM device name.
This shortens delays, where i.e. lvm2 is asked to deactivate
volume with mounted btrfs as such operation is not retryed
and user is informed about device being in use.
Instead of compiling 2 log call for 2 different logging functions,
and runtime decide which version to use - use only 'newer' function
and when user sets his own OLD dm_log logging translate it runtime
for old arg list set.
The positive part is - we get shorter generated library,
on the negative part this translation means, we always have evaluate
all args and print the message into local on stack buffer, before
we can pass this buffer to the users' logging function with proper
expected parameters (and such function may later decide to discard
logging based on message level so whole printing was unnecessary).
Introduce macros:
log_level(), log_stderr(), log_once(), log_bypass_report()
For easier and more consisten way how to 'decoder' bits
of info from passed 'level'.
This patch fixes potential problem when 'level' of message
might not have always masked right bits.
log_print is used during cmd line processing to log the result of the
operation (e.g. "Volume group vg successfully changed" and similar).
We don't want output from log_print to be interleaved with current
reports from group where log is reported as well. Also, the information
printed by log_print belongs to the log report too, so it should be
rerouted to log report if it's set.
Since the code in libdm-report which is responsible for doing the report
output uses log_print too, we need to use a different kind of log_print
which bypasses any log report currently used for logging (...simply,
we can't call log_print to output the log report itself which in turn
would again reroute to report - the report would never get on output
this way).
When using udev, the /dev/mapper entries are symlinks - fix the code
to count with this.
This patch also fixes the dmsetup mknodes and vgmknodes to properly
repair /dev/mapper content if it sees dangling symlink in /dev/mapper.
Commit 94786a3bbf introduced
another bug - since sscanf needs extra 1 byte for \0.
Since there is no easy way to do a macro evaluation for (PATH_MAX-1)
and string concatation of this number to get resulting (%4095s) - let's
go with easiest path and restore extra byte for 0.
Other option would be to prepare sscanf parsing string in runtime.
But lets resolve it when we look at PATH_MAX handling later...
Avoid playing with +1.
PATH_MAX code needs probably more thinking anyway, since
there is no MAX path in Linux - user may easily create path
with 64kB chars - so 4kB buffer is surelly not enough for
such dirs.
Note:
http://insanecoding.blogspot.cz/2007/11/pathmax-simply-isnt.html
