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zfs/cmd/zed/zed_strings.h

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Initial implementation of zed (ZFS Event Daemon) zed monitors ZFS events. When a zevent is posted, zed will run any scripts that have been enabled for the corresponding zevent class. Multiple scripts may be invoked for a given zevent. The zevent nvpairs are passed to the scripts as environment variables. Events are processed synchronously by the single thread, and there is no maximum timeout for script execution. Consequently, a misbehaving script can delay (or forever block) the processing of subsequent zevents. Plans are to address this in future commits. Initial scripts have been developed to log events to syslog and send email in response to checksum/data/io errors and resilver.finish/scrub.finish events. By default, email will only be sent if the ZED_EMAIL variable is configured in zed.rc (which is serving as a config file of sorts until a proper configuration file is implemented). Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2
2014-01-21 21:30:03 +00:00
/*
Update ZED copyright boilerplate This commit updates the copyright boilerplate within the ZED subtree. The instructions for appending a contributor copyright line have been removed. Manually maintaining copyright notices in this manner is error-prone, imprecise at a file-scope granularity, and oftentimes inaccurate. These lines can become a pernicious source of merge conflicts. A commit log is better suited to maintaining this information. Consequently, a line has been added to the boilerplate to refer to the git commit log for authoritative copyright attribution. To account for the scenario where a file may become separated from the codebase and commit history (i.e., it is copied somewhere else), a line has been added to identify the file's origin. http://softwarefreedom.org/resources/2012/ManagingCopyrightInformation.html Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3384
2015-05-06 22:56:03 +00:00
* This file is part of the ZFS Event Daemon (ZED)
* for ZFS on Linux (ZoL) <http://zfsonlinux.org/>.
Initial implementation of zed (ZFS Event Daemon) zed monitors ZFS events. When a zevent is posted, zed will run any scripts that have been enabled for the corresponding zevent class. Multiple scripts may be invoked for a given zevent. The zevent nvpairs are passed to the scripts as environment variables. Events are processed synchronously by the single thread, and there is no maximum timeout for script execution. Consequently, a misbehaving script can delay (or forever block) the processing of subsequent zevents. Plans are to address this in future commits. Initial scripts have been developed to log events to syslog and send email in response to checksum/data/io errors and resilver.finish/scrub.finish events. By default, email will only be sent if the ZED_EMAIL variable is configured in zed.rc (which is serving as a config file of sorts until a proper configuration file is implemented). Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2
2014-01-21 21:30:03 +00:00
* Developed at Lawrence Livermore National Laboratory (LLNL-CODE-403049).
* Copyright (C) 2013-2014 Lawrence Livermore National Security, LLC.
Update ZED copyright boilerplate This commit updates the copyright boilerplate within the ZED subtree. The instructions for appending a contributor copyright line have been removed. Manually maintaining copyright notices in this manner is error-prone, imprecise at a file-scope granularity, and oftentimes inaccurate. These lines can become a pernicious source of merge conflicts. A commit log is better suited to maintaining this information. Consequently, a line has been added to the boilerplate to refer to the git commit log for authoritative copyright attribution. To account for the scenario where a file may become separated from the codebase and commit history (i.e., it is copied somewhere else), a line has been added to identify the file's origin. http://softwarefreedom.org/resources/2012/ManagingCopyrightInformation.html Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3384
2015-05-06 22:56:03 +00:00
* Refer to the ZoL git commit log for authoritative copyright attribution.
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License Version 1.0 (CDDL-1.0).
* You can obtain a copy of the license from the top-level file
* "OPENSOLARIS.LICENSE" or at <http://opensource.org/licenses/CDDL-1.0>.
* You may not use this file except in compliance with the license.
Initial implementation of zed (ZFS Event Daemon) zed monitors ZFS events. When a zevent is posted, zed will run any scripts that have been enabled for the corresponding zevent class. Multiple scripts may be invoked for a given zevent. The zevent nvpairs are passed to the scripts as environment variables. Events are processed synchronously by the single thread, and there is no maximum timeout for script execution. Consequently, a misbehaving script can delay (or forever block) the processing of subsequent zevents. Plans are to address this in future commits. Initial scripts have been developed to log events to syslog and send email in response to checksum/data/io errors and resilver.finish/scrub.finish events. By default, email will only be sent if the ZED_EMAIL variable is configured in zed.rc (which is serving as a config file of sorts until a proper configuration file is implemented). Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2
2014-01-21 21:30:03 +00:00
*/
#ifndef ZED_STRINGS_H
#define ZED_STRINGS_H
typedef struct zed_strings zed_strings_t;
Use cstyle -cpP in `make cstyle` check Enable picky cstyle checks and resolve the new warnings. The vast majority of the changes needed were to handle minor issues with whitespace formatting. This patch contains no functional changes. Non-whitespace changes are as follows: * 8 times ; to { } in for/while loop * fix missing ; in cmd/zed/agents/zfs_diagnosis.c * comment (confim -> confirm) * change endline , to ; in cmd/zpool/zpool_main.c * a number of /* BEGIN CSTYLED */ /* END CSTYLED */ blocks * /* CSTYLED */ markers * change == 0 to ! * ulong to unsigned long in module/zfs/dsl_scan.c * rearrangement of module_param lines in module/zfs/metaslab.c * add { } block around statement after for_each_online_node Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Håkan Johansson <f96hajo@chalmers.se> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #5465
2016-12-12 18:46:26 +00:00
zed_strings_t *zed_strings_create(void);
Initial implementation of zed (ZFS Event Daemon) zed monitors ZFS events. When a zevent is posted, zed will run any scripts that have been enabled for the corresponding zevent class. Multiple scripts may be invoked for a given zevent. The zevent nvpairs are passed to the scripts as environment variables. Events are processed synchronously by the single thread, and there is no maximum timeout for script execution. Consequently, a misbehaving script can delay (or forever block) the processing of subsequent zevents. Plans are to address this in future commits. Initial scripts have been developed to log events to syslog and send email in response to checksum/data/io errors and resilver.finish/scrub.finish events. By default, email will only be sent if the ZED_EMAIL variable is configured in zed.rc (which is serving as a config file of sorts until a proper configuration file is implemented). Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2
2014-01-21 21:30:03 +00:00
void zed_strings_destroy(zed_strings_t *zsp);
Protect against adding duplicate strings in ZED The zed_strings container stores strings in an AVL, but does not check for duplicate strings being added. Within the AVL, strings are indexed by the string value itself. avl_add() requires the node being added must not already exist in the tree, and will assert() if this is not the case. This should not cause problems in practice. ZED uses this container in two places. In zed_conf.c, it is used to store the names of enabled zedlets as zed scans the zedlet directory listing; duplicate entries cannot occur here since duplicate names cannot occur within a directory. In zed_event.c, it is used to store the environment variables (as "NAME=VALUE" strings) that will be passed to zedlets; duplicate strings here should never happen unless there is a bug resulting in a duplicate nvpair or environment variable. This commit protects against adding a duplicate to a zed_strings container by first checking for the string being added, and removing the previous entry should one exist. This implements a "last one wins" policy. This commit also changes the prototype for zed_strings_add() to allow the string key (by which it is indexed in the AVL) to differ from the string value. By adding zedlet environment variables using the variable name as the key, multiple adds for the same variable name will result in only the last value being stored. Finally, this commit routes all additions of zedlet environment variables through the updated _zed_event_add_var(). This ensures all zedlet environment variable names are properly converted. Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3042
2014-10-19 19:05:07 +00:00
int zed_strings_add(zed_strings_t *zsp, const char *key, const char *s);
Use cstyle -cpP in `make cstyle` check Enable picky cstyle checks and resolve the new warnings. The vast majority of the changes needed were to handle minor issues with whitespace formatting. This patch contains no functional changes. Non-whitespace changes are as follows: * 8 times ; to { } in for/while loop * fix missing ; in cmd/zed/agents/zfs_diagnosis.c * comment (confim -> confirm) * change endline , to ; in cmd/zpool/zpool_main.c * a number of /* BEGIN CSTYLED */ /* END CSTYLED */ blocks * /* CSTYLED */ markers * change == 0 to ! * ulong to unsigned long in module/zfs/dsl_scan.c * rearrangement of module_param lines in module/zfs/metaslab.c * add { } block around statement after for_each_online_node Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Håkan Johansson <f96hajo@chalmers.se> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #5465
2016-12-12 18:46:26 +00:00
const char *zed_strings_first(zed_strings_t *zsp);
const char *zed_strings_next(zed_strings_t *zsp);
Initial implementation of zed (ZFS Event Daemon) zed monitors ZFS events. When a zevent is posted, zed will run any scripts that have been enabled for the corresponding zevent class. Multiple scripts may be invoked for a given zevent. The zevent nvpairs are passed to the scripts as environment variables. Events are processed synchronously by the single thread, and there is no maximum timeout for script execution. Consequently, a misbehaving script can delay (or forever block) the processing of subsequent zevents. Plans are to address this in future commits. Initial scripts have been developed to log events to syslog and send email in response to checksum/data/io errors and resilver.finish/scrub.finish events. By default, email will only be sent if the ZED_EMAIL variable is configured in zed.rc (which is serving as a config file of sorts until a proper configuration file is implemented). Signed-off-by: Chris Dunlap <cdunlap@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2
2014-01-21 21:30:03 +00:00
int zed_strings_count(zed_strings_t *zsp);
#endif /* !ZED_STRINGS_H */