- 07 Apr, 2009 40 commits
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Ryusuke Konishi authored
This adds the meta data file, which serves common buffer functions to the DAT, sufile, cpfile, ifile, and so forth. Signed-off-by:
Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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Ryusuke Konishi authored
This adds common routines for buffer/page operations used in B-tree node caches, meta data files, or segment constructor (log writer). NILFS uses copy functions for buffers and pages due to the following reasons: 1) Relocation required for COW Since NILFS changes address of on-disk blocks, moving buffers in page cache is needed for the buffers which are not addressed by a file offset. If buffer size is smaller than page size, this involves partial copy of pages. 2) Freezing mmapped pages NILFS calculates checksums for each log to ensure its validity. If page data changes after the checksum calculation, this validity check will not work correctly. To avoid this failure for mmaped pages, NILFS freezes their data by copying. 3) Copy-on-write for DAT pages NILFS makes clones of DAT page caches in a copy-on-write manner during GC processes, and this ensures atomicity and consistency of the DAT in the transient state. In addition, NILFS uses two obsolete functions, nilfs_mark_buffer_dirty() and nilfs_clear_page_dirty() respectively. * nilfs_mark_buffer_dirty() was required to avoid NULL pointer dereference faults: Since the page cache of B-tree node pages or data page cache of pseudo inodes does not have a valid mapping->host, calling mark_buffer_dirty() for their buffers causes the fault; it calls __mark_inode_dirty(NULL) through __set_page_dirty(). * nilfs_clear_page_dirty() was needed in the two cases: 1) For B-tree node pages and data pages of the dat/gcdat, NILFS2 clears page dirty flags when it copies back pages from the cloned cache (gcdat->{i_mapping,i_btnode_cache}) to its original cache (dat->{i_mapping,i_btnode_cache}). 2) Some B-tree operations like insertion or deletion may dispose buffers in dirty state, and this needs to cancel the dirty state of their pages. clear_page_dirty_for_io() caused faults because it does not clear the dirty tag on the page cache. Signed-off-by:Seiji Kihara <kihara.seiji@lab.ntt.co.jp> Signed-off-by:
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Ryusuke Konishi authored
This adds routines for B-tree node buffers. Signed-off-by:
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Koji Sato authored
This adds block mappings using direct pointers which are stored in the i_bmap array of inode. Signed-off-by:
Koji Sato <sato.koji@lab.ntt.co.jp> Signed-off-by:
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Koji Sato authored
This adds declarations and functions of NILFS2 B-tree. Two variants are integrated in the NILFS2 B-tree. The B-tree for the most files points to the child nodes or data blocks with virtual block addresses, whereas the B-tree of the DAT uses actual block addresses. Signed-off-by:
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Koji Sato authored
This adds structures and operations for the block mapping (bmap for short). NILFS2 uses direct mappings for short files or B-tree based mappings for longer files. Every on-disk data block is held with inodes and managed through this block mapping. The nilfs_bmap structure and a set of functions here provide this capability to the NILFS2 inode. [penberg@cs.helsinki.fi: remove a bunch of bmap wrapper macros] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by:
Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by:
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Ryusuke Konishi authored
This adds the following common structures of the NILFS2 file system. * nilfs_inode_info structure: gives on-memory inode. * nilfs_sb_info structure: keeps per-mount state and a special inode for the ifile. This structure is attached to the super_block structure. * the_nilfs structure: keeps shared state and locks among a read/write mount and snapshot mounts. This keeps special inodes for the sufile, cpfile, dat, and another dat inode used during GC (gcdat). This also has a hash table of dummy inodes to cache disk blocks during GC (gcinodes). * nilfs_transaction_info structure: keeps per task state while nilfs is writing logs or doing indivisible inode or namespace operations. This structure is used to identify context during log making and store nest level of the lock which ensures atomicity of file system operations. Signed-off-by:
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Koji Sato authored
This adds a header file which specifies the on-disk format and ioctl interface of the nilfs2 file system. Signed-off-by:
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Ryusuke Konishi authored
This adds a document describing the features, mount options, userland tools, usage, disk format, and related URLs for the nilfs2 file system. Signed-off-by:
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Yang Hongyang authored
Update the old macro DMA_nBIT_MASK related documentations Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Yang Hongyang authored
Replace all DMA_24BIT_MASK macro with DMA_BIT_MASK(24) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Yang Hongyang authored
Replace all DMA_28BIT_MASK macro with DMA_BIT_MASK(28) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Yang Hongyang authored
Replace all DMA_30BIT_MASK macro with DMA_BIT_MASK(30) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Yang Hongyang authored
Replace all DMA_31BIT_MASK macro with DMA_BIT_MASK(31) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Yang Hongyang authored
Replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Yang Hongyang authored
Replace all DMA_39BIT_MASK macro with DMA_BIT_MASK(39) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Yang Hongyang authored
Replace all DMA_40BIT_MASK macro with DMA_BIT_MASK(40) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Yang Hongyang authored
Replace all DMA_48BIT_MASK macro with DMA_BIT_MASK(48) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Yang Hongyang authored
Replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by:
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Coly Li authored
Make romfs return f_fsid info for statfs(2). Signed-off-by:
Coly Li <coly.li@suse.de> Signed-off-by:
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Serge E. Hallyn authored
Largely inspired from ipc/ipc_sysctl.c. This patch isolates the mqueue sysctl stuff in its own file. [akpm@linux-foundation.org: build fix] Signed-off-by:
Cedric Le Goater <clg@fr.ibm.com> Signed-off-by:
Nadia Derbey <Nadia.Derbey@bull.net> Signed-off-by:
Serge E. Hallyn <serue@us.ibm.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by:
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Serge E. Hallyn authored
Implement multiple mounts of the mqueue file system, and link it to usage of CLONE_NEWIPC. Each ipc ns has a corresponding mqueuefs superblock. When a user does clone(CLONE_NEWIPC) or unshare(CLONE_NEWIPC), the unshare will cause an internal mount of a new mqueuefs sb linked to the new ipc ns. When a user does 'mount -t mqueue mqueue /dev/mqueue', he mounts the mqueuefs superblock. Posix message queues can be worked with both through the mq_* system calls (see mq_overview(7)), and through the VFS through the mqueue mount. Any usage of mq_open() and friends will work with the acting task's ipc namespace. Any actions through the VFS will work with the mqueuefs in which the file was created. So if a user doesn't remount mqueuefs after unshare(CLONE_NEWIPC), mq_open("/ab") will not be reflected in "ls /dev/mqueue". If task a mounts mqueue for ipc_ns:1, then clones task b with a new ipcns, ipcns:2, and then task a is the last task in ipc_ns:1 to exit, then (1) ipc_ns:1 will be freed, (2) it's superblock will live on until task b umounts the corresponding mqueuefs, and vfs actions will continue to succeed, but (3) sb->s_fs_info will be NULL for the sb corresponding to the deceased ipc_ns:1. To make this happen, we must protect the ipc reference count when a) a task exits and drops its ipcns->count, since it might be dropping it to 0 and freeing the ipcns b) a task accesses the ipcns through its mqueuefs interface, since it bumps the ipcns refcount and might race with the last task in the ipcns exiting. So the kref is changed to an atomic_t so we can use atomic_dec_and_lock(&ns->count,mq_lock), and every access to the ipcns through ns = mqueuefs_sb->s_fs_info is protected by the same lock. Signed-off-by: -
Serge E. Hallyn authored
Move mqueue vfsmount plus a few tunables into the ipc_namespace struct. The CONFIG_IPC_NS boolean and the ipc_namespace struct will serve both the posix message queue namespaces and the SYSV ipc namespaces. The sysctl code will be fixed separately in patch 3. After just this patch, making a change to posix mqueue tunables always changes the values in the initial ipc namespace. Signed-off-by:
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Serge E. Hallyn authored
The mqueuefs filesystem will use this helper as well. Proc's main get_sb could also be made to use it, but that will require a bit more rework. Signed-off-by:
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Michal Januszewski authored
Update the uvesafb documentation to accurately reflect the default options used by the driver. Signed-off-by:
Michal Januszewski <spock@gentoo.org> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by:
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Guennadi Liakhovetski authored
1. check for errors returned from clk_get() 2. fix "Unbalanced enable for IRQ 160" 3. fix transmit descriptor handling in panning 4. clean frame buffer on blank - useful for OLED displays 5. formatting clean up Signed-off-by:
Guennadi Liakhovetski <lg@denx.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Signed-off-by:
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Krzysztof Helt authored
Read DDC information from a connected monitor and use it to select initial mode (if the mode is not specified). Also, use the information to protect against modes outside the monitor specs. Signed-off-by:
Krzysztof Helt <krzysztof.h1@wp.pl> Tested-by:
Jean Delvare <khali@linux-fr.org> Signed-off-by:
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Krzysztof Helt authored
The I2C functionality provided by the i2c-voodoo3 driver is moved into the tdfxfb (frame buffer driver for Voodoo3 cards). This way there is no conflict between the i2c driver and the fb driver. The tdfxfb does not make use from the DDC functionality yet but provides all the functionality of the i2c-voodoo3 driver. Signed-off-by:
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Masami Hiramatsu authored
Add disable/enable_kretprobe() and disable/enable_jprobe(). Signed-off-by:
Masami Hiramatsu <mhiramat@redhat.com> Acked-by:
Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by:
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Masami Hiramatsu authored
Add disable_kprobe() and enable_kprobe() to disable/enable kprobes temporarily. disable_kprobe() asynchronously disables probe handlers of specified kprobe. So, after calling it, some handlers can be called at a while. enable_kprobe() enables specified kprobe. aggr_pre_handler and aggr_post_handler check disabled probes. On the other hand aggr_break_handler and aggr_fault_handler don't check it because these handlers will be called while executing pre or post handlers and usually those help error handling. Signed-off-by:
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Masami Hiramatsu authored
Rename kprobe_enabled to kprobes_all_disarmed and invert logic due to avoiding naming confusion from per-probe disabling. Signed-off-by:
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Masami Hiramatsu authored
Fix comment style in kprobes.h. Signed-off-by:
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Masami Hiramatsu authored
Clean up positions of EXPORT_SYMBOL_GPL in kernel/kprobes.c according to checkpatch.pl. Signed-off-by:
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Masami Hiramatsu authored
Currently, kprobes can disable all probes at once, but can't disable it individually (not unregister, just disable an kprobe, because unregistering needs to wait for scheduler synchronization). These patches introduce APIs for on-the-fly per-probe disabling and re-enabling by dis-arming/re-arming its breakpoint instruction. This patch: Change old_p to ap in add_new_kprobe() for readability, copy flags member in add_aggr_kprobe(), and simplify the code flow of register_aggr_kprobe(). Signed-off-by:
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Mike Rapoport authored
Signed-off-by:
Mike Rapoport <mike@compulab.co.il> Cc: Bryan Wu <bryan.wu@analog.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by:
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Mike Rapoport authored
Signed-off-by:
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Mike Rapoport authored
Some SPI controllers have restrictions on DMAable buffers alignemt. Currently if the buffer supplied by protocol driver is not properly aligned, the controller silently performs transfer in PIO mode. Addition of dma_alignment field to spi_master allows protocol drivers to perform proper alignment. Signed-off-by:
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Mike Rapoport authored
Signed-off-by:
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Eric Miao authored
Most SPI peripherals use GPIOs as their chip selects, introduce .gpio_cs for this. Signed-off-by:
Eric Miao <eric.miao@marvell.com> Cc: David Brownell <david-b@pacbell.net> Cc: Russell King <rmk@arm.linux.org.uk> Signed-off-by:
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Roel Kluin authored
With a postfix decrement limit will reach -1 rather than 0, so the warning will not be issued. Also, add a cpu_relax() into the busy-wait loop. Signed-off-by:
Roel Kluin <roel.kluin@gmail.com> Cc: Mariusz Ceier <mceier@gmail.com> Acked-by:
David Brownell <dbrownell@users.sourceforge.net> Signed-off-by:
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