Can an ext4 inode be forcefully deleted?

~ dmesg excerpts~
[Fri Jun 1 16:30:45 2012] EXT4-fs error (device dm-2): ext4_lookup:1044: inode #16260502: comm dropbox: deleted inode referenced: 16277969
[Fri Jun 1 16:30:45 2012] EXT4-fs error (device dm-2): ext4_lookup:1044: inode #16260502: comm dropbox: deleted inode referenced: 16277969
[Fri Jun 1 16:30:45 2012] EXT4-fs error (device dm-2): ext4_lookup:1044: inode #16260502: comm dropbox: deleted inode referenced: 16277969
[Fri Jun 1 17:00:39 2012] EXT4-fs error (device dm-2): ext4_lookup:1044: inode #16260502: comm dropbox: deleted inode referenced: 16277969
[Fri Jun 1 17:00:39 2012] EXT4-fs error (device dm-2): ext4_lookup:1044: inode #16260502: comm dropbox: deleted inode referenced: 16277969
[Fri Jun 1 17:00:39 2012] EXT4-fs error (device dm-2): ext4_lookup:1044: inode #16260502: comm dropbox: deleted inode referenced: 16277969
[Fri Jun 1 17:30:34 2012] EXT4-fs error (device dm-2): ext4_lookup:1044: inode #16260502: comm dropbox: deleted inode referenced: 16277969
[Fri Jun 1 17:30:34 2012] EXT4-fs error (device dm-2): ext4_lookup:1044: inode #16260502: comm dropbox: deleted inode referenced: 16277969
[Fri Jun 1 17:30:34 2012] EXT4-fs error (device dm-2): ext4_lookup:1044: inode #16260502: comm dropbox: deleted inode referenced: 16277969
~
[Fri Jun 1 08:29:14 2012] ata4.00: exception Emask 0x0 SAct 0x7 SErr 0x0 action 0x0
[Fri Jun 1 08:29:14 2012] ata4.00: irq_stat 0x40000008
[Fri Jun 1 08:29:14 2012] ata4.00: failed command: READ FPDMA QUEUED
[Fri Jun 1 08:29:14 2012] ata4.00: cmd 60/00:00:e7:47:46/01:00:01:00:00/40 tag 0 ncq 131072 in
[Fri Jun 1 08:29:14 2012] res 41/40:00:dc:48:46/00:00:01:00:00/40 Emask 0x409 (media error) <F>
[Fri Jun 1 08:29:14 2012] ata4.00: status: { DRDY ERR }
[Fri Jun 1 08:29:14 2012] ata4.00: error: { UNC }
[Fri Jun 1 08:29:14 2012] ata4.00: configured for UDMA/133
[Fri Jun 1 08:29:14 2012] ata4: EH complete
[Fri Jun 1 08:29:16 2012] ata4.00: exception Emask 0x0 SAct 0x5 SErr 0x0 action 0x0
[Fri Jun 1 08:29:16 2012] ata4.00: irq_stat 0x40000008
[Fri Jun 1 08:29:16 2012] ata4.00: failed command: READ FPDMA QUEUED
[Fri Jun 1 08:29:16 2012] ata4.00: cmd 60/00:10:e7:47:46/01:00:01:00:00/40 tag 2 ncq 131072 in
[Fri Jun 1 08:29:16 2012] res 41/40:00:dc:48:46/00:00:01:00:00/40 Emask 0x409 (media error) <F>
[Fri Jun 1 08:29:16 2012] ata4.00: status: { DRDY ERR }
[Fri Jun 1 08:29:16 2012] ata4.00: error: { UNC }
[Fri Jun 1 08:29:16 2012] ata4.00: configured for UDMA/133
[Fri Jun 1 08:29:16 2012] ata4: EH complete
smartctl 5.42 2011-10-20 r3458 [x86_64-linux-3.3.4-2-ARCH] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Model Family: SAMSUNG SpinPoint F3
Device Model: SAMSUNG HD103SJ
Serial Number: S246J90B317366
LU WWN Device Id: 5 0024e9 204c645a8
Firmware Version: 1AJ10001
User Capacity: 1,000,204,886,016 bytes [1.00 TB]
Sector Size: 512 bytes logical/physical
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: ATA-8-ACS revision 6
Local Time is: Fri Jun 1 21:08:06 2012 BST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection: Disabled.
Self-test execution status: ( 0) The previous self-test routine completed
without error or no self-test has ever
been run.
Total time to complete Offline
data collection: ( 9360) seconds.
Offline data collection
capabilities: (0x5b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
No Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 2) minutes.
Extended self-test routine
recommended polling time: ( 156) minutes.
SCT capabilities: (0x003f) SCT Status supported.
SCT Error Recovery Control supported.
SCT Feature Control supported.
SCT Data Table supported.
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 100 100 051 Pre-fail Always - 312
2 Throughput_Performance 0x0026 052 052 000 Old_age Always - 9287
3 Spin_Up_Time 0x0023 071 069 025 Pre-fail Always - 9067
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 182
5 Reallocated_Sector_Ct 0x0033 252 252 010 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 252 252 051 Old_age Always - 0
8 Seek_Time_Performance 0x0024 252 252 015 Old_age Offline - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 7805
10 Spin_Retry_Count 0x0032 252 252 051 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 252 252 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 747
191 G-Sense_Error_Rate 0x0022 100 100 000 Old_age Always - 1
192 Power-Off_Retract_Count 0x0022 252 252 000 Old_age Always - 0
194 Temperature_Celsius 0x0002 064 059 000 Old_age Always - 28 (Min/Max 14/44)
195 Hardware_ECC_Recovered 0x003a 100 100 000 Old_age Always - 0
196 Reallocated_Event_Count 0x0032 252 252 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 100 100 000 Old_age Always - 1
198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline - 20
199 UDMA_CRC_Error_Count 0x0036 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x002a 100 100 000 Old_age Always - 332
223 Load_Retry_Count 0x0032 252 252 000 Old_age Always - 0
225 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 747
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Extended offline Completed without error 00% 7416 -
# 2 Short offline Completed without error 00% 7399 -
# 3 Short offline Completed: read failure 90% 7356 24107308
# 4 Extended offline Completed: read failure 90% 7356 24107308
# 5 Short offline Completed without error 00% 129 -
2 of 2 failed self-tests are outdated by newer successful extended offline self-test # 1
Note: selective self-test log revision number (0) not 1 implies that no selective self-test has ever been run
SMART Selective self-test log data structure revision number 0
Note: revision number not 1 implies that no selective self-test has ever been run
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Completed [00% left] (0-65535)
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
One of my disks in a RAID 1 configuration is slowly developing more bad sectors (21 and counting), but this has been over a period of several months so I'm not particularly worried about short term failure. I have reason to believe they are due to vibration
Is there a way of telling ext4 to delete the files/inodes in question (which are disposable) without rebooting or dismounting the filesystem to run fsck?
My system is a remote headless server, and it wouldn't be the first time fsck has got stuck resulting in several hours of downtime before manual intervention.
Any attempts to rm or otherwise access the files results in 'Input/Output error', which is strange in my mind given the disk is part of a raid (mdadm based) - surely it should simply pass over to the other disk? Mdadm doesn't appear to detect any issues and considers the raid healthy

ChuckLD wrote:
I'm beginning to notice that my disk space is getting limited on my external drive that Time Machine uses to do its backups. Is it possible to go into TimeMachine and delete individual items i.e., a movie etc. in order to regain disk space? If it does a back up of each movie or TV show, and at some point I no longer want/need them so I delete them, they are still on my TimeMachine Backup. I would like to also delete it from the Backup. Is that possible?
Thanks !
Chuck :- )
It's probably not a good idea to change anything in the TM file system. The data are not actually stored as files but for the first time. After that they are stored as "deltas" or changes. When TM restores a file, it uses the original and all the bits and pieces to recreate the most recent file. Disturbing the TM structure is dangerous.
TM will automatically start deleting old files when it gets full, so don't be concerned with filespace.
If any old files are on TM that you don't want it to delete, simply restore them, let TM back them up again, and TM will eventually delete the old original copies, leaving your new ones.
If you have a continual problem with the TM disk getting full, then you need a larger disk.

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Can an ext4 inode be forcefully deleted?

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