forked from luck/tmp_suning_uos_patched
7bb46a6734
Introduce a new truncate calling sequence into fs/mm subsystems. Rather than setattr > vmtruncate > truncate, have filesystems call their truncate sequence from ->setattr if filesystem specific operations are required. vmtruncate is deprecated, and truncate_pagecache and inode_newsize_ok helpers introduced previously should be used. simple_setattr is introduced for simple in-ram filesystems to implement the new truncate sequence. Eventually all filesystems should be converted to implement a setattr, and the default code in notify_change should go away. simple_setsize is also introduced to perform just the ATTR_SIZE portion of simple_setattr (ie. changing i_size and trimming pagecache). To implement the new truncate sequence: - filesystem specific manipulations (eg freeing blocks) must be done in the setattr method rather than ->truncate. - vmtruncate can not be used by core code to trim blocks past i_size in the event of write failure after allocation, so this must be performed in the fs code. - convert usage of helpers block_write_begin, nobh_write_begin, cont_write_begin, and *blockdev_direct_IO* to use _newtrunc postfixed variants. These avoid calling vmtruncate to trim blocks (see previous). - inode_setattr should not be used. generic_setattr is a new function to be used to copy simple attributes into the generic inode. - make use of the better opportunity to handle errors with the new sequence. Big problem with the previous calling sequence: the filesystem is not called until i_size has already changed. This means it is not allowed to fail the call, and also it does not know what the previous i_size was. Also, generic code calling vmtruncate to truncate allocated blocks in case of error had no good way to return a meaningful error (or, for example, atomically handle block deallocation). Cc: Christoph Hellwig <hch@lst.de> Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> |
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| ABI | ||
| accounting | ||
| acpi | ||
| aoe | ||
| arm | ||
| auxdisplay | ||
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| block | ||
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| crypto | ||
| development-process | ||
| device-mapper | ||
| DocBook | ||
| driver-model | ||
| dvb | ||
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| fb | ||
| filesystems | ||
| firmware_class | ||
| frv | ||
| hwmon | ||
| i2c | ||
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| vm | ||
| w1 | ||
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| x86 | ||
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| 00-INDEX | ||
| applying-patches.txt | ||
| atomic_ops.txt | ||
| bad_memory.txt | ||
| basic_profiling.txt | ||
| binfmt_misc.txt | ||
| braille-console.txt | ||
| bt8xxgpio.txt | ||
| btmrvl.txt | ||
| BUG-HUNTING | ||
| cachetlb.txt | ||
| Changes | ||
| circular-buffers.txt | ||
| CodingStyle | ||
| cpu-hotplug.txt | ||
| cpu-load.txt | ||
| cputopology.txt | ||
| credentials.txt | ||
| dcdbas.txt | ||
| debugging-modules.txt | ||
| debugging-via-ohci1394.txt | ||
| dell_rbu.txt | ||
| devices.txt | ||
| DMA-API-HOWTO.txt | ||
| DMA-API.txt | ||
| DMA-attributes.txt | ||
| DMA-ISA-LPC.txt | ||
| dmaengine.txt | ||
| dontdiff | ||
| dynamic-debug-howto.txt | ||
| edac.txt | ||
| eisa.txt | ||
| email-clients.txt | ||
| feature-removal-schedule.txt | ||
| flexible-arrays.txt | ||
| futex-requeue-pi.txt | ||
| gcov.txt | ||
| gpio.txt | ||
| highuid.txt | ||
| HOWTO | ||
| hw_random.txt | ||
| init.txt | ||
| initrd.txt | ||
| intel_txt.txt | ||
| Intel-IOMMU.txt | ||
| io_ordering.txt | ||
| io-mapping.txt | ||
| IO-mapping.txt | ||
| iostats.txt | ||
| IPMI.txt | ||
| IRQ-affinity.txt | ||
| IRQ.txt | ||
| irqflags-tracing.txt | ||
| isapnp.txt | ||
| java.txt | ||
| kernel-doc-nano-HOWTO.txt | ||
| kernel-docs.txt | ||
| kernel-parameters.txt | ||
| keys-request-key.txt | ||
| keys.txt | ||
| kmemcheck.txt | ||
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| kobject.txt | ||
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| kref.txt | ||
| ldm.txt | ||
| leds-class.txt | ||
| leds-lp3944.txt | ||
| local_ops.txt | ||
| lockdep-design.txt | ||
| lockstat.txt | ||
| logo.gif | ||
| logo.txt | ||
| magic-number.txt | ||
| Makefile | ||
| ManagementStyle | ||
| mca.txt | ||
| md.txt | ||
| memory-barriers.txt | ||
| memory-hotplug.txt | ||
| memory.txt | ||
| mono.txt | ||
| mutex-design.txt | ||
| nmi_watchdog.txt | ||
| nommu-mmap.txt | ||
| numastat.txt | ||
| oops-tracing.txt | ||
| padata.txt | ||
| parport-lowlevel.txt | ||
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| pi-futex.txt | ||
| pnp.txt | ||
| preempt-locking.txt | ||
| printk-formats.txt | ||
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| rbtree.txt | ||
| rfkill.txt | ||
| robust-futex-ABI.txt | ||
| robust-futexes.txt | ||
| rt-mutex-design.txt | ||
| rt-mutex.txt | ||
| rtc.txt | ||
| SAK.txt | ||
| SecurityBugs | ||
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| serial-console.txt | ||
| sgi-ioc4.txt | ||
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| slow-work.txt | ||
| SM501.txt | ||
| Smack.txt | ||
| sparse.txt | ||
| spinlocks.txt | ||
| stable_api_nonsense.txt | ||
| stable_kernel_rules.txt | ||
| SubmitChecklist | ||
| SubmittingDrivers | ||
| SubmittingPatches | ||
| svga.txt | ||
| sysfs-rules.txt | ||
| sysrq.txt | ||
| tomoyo.txt | ||
| unaligned-memory-access.txt | ||
| unicode.txt | ||
| unshare.txt | ||
| VGA-softcursor.txt | ||
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| video-output.txt | ||
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