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path: root/fs/ext4/ext4_extents.h
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* ext4: drop ec_type from the ext4_ext_cache structureTheodore Ts'o2011-01-10
| | | | | | | | | | | We can encode the ec_type information by using ee_len == 0 to denote EXT4_EXT_CACHE_NO, ee_start == 0 to denote EXT4_EXT_CACHE_GAP, and if neither is true, then the cache type must be EXT4_EXT_CACHE_EXTENT. This allows us to reduce the size of ext4_ext_inode by another 8 bytes. (ec_type is 4 bytes, plus another 4 bytes of padding) Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: use ext4_lblk_t instead of sector_t for logical blocksTheodore Ts'o2011-01-10
| | | | | | | | | | This fixes a number of places where we used sector_t instead of ext4_lblk_t for logical blocks, which for ext4 are still 32-bit data types. No point wasting space in the ext4_inode_info structure, and requiring 64-bit arithmetic on 32-bit systems, when it isn't necessary. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: rename {ext,idx}_pblock and inline small extent functionsTheodore Ts'o2010-10-27
| | | | | | | | | Cleanup namespace leaks from fs/ext4 and the inline trivial functions ext4_{ext,idx}_pblock() and ext4_{ext,idx}_store_pblock() since the code size actually shrinks when we make these functions inline, they're so trivial. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: make various ext4 functions be staticTheodore Ts'o2010-10-27
| | | | | | | | | | | | | | These functions have no need to be exported beyond file context. No functions needed to be moved for this commit; just some function declarations changed to be static and removed from header files. (A similar patch was submitted by Eric Sandeen, but I wanted to handle code movement in separate patches to make sure code changes didn't accidentally get dropped.) Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Calculate metadata requirements more accuratelyTheodore Ts'o2010-01-01
| | | | | | | | | | | | | | | | | | | | | | | | | | In the past, ext4_calc_metadata_amount(), and its sub-functions ext4_ext_calc_metadata_amount() and ext4_indirect_calc_metadata_amount() badly over-estimated the number of metadata blocks that might be required for delayed allocation blocks. This didn't matter as much when functions which managed the reserved metadata blocks were more aggressive about dropping reserved metadata blocks as delayed allocation blocks were written, but unfortunately they were too aggressive. This was fixed in commit 0637c6f, but as a result the over-estimation by ext4_calc_metadata_amount() would lead to reserving 2-3 times the number of pending delayed allocation blocks as potentially required metadata blocks. So if there are 1 megabytes of blocks which have been not yet been allocation, up to 3 megabytes of space would get reserved out of the user's quota and from the file system free space pool until all of the inode's data blocks have been allocated. This commit addresses this problem by much more accurately estimating the number of metadata blocks that will be required. It will still somewhat over-estimate the number of blocks needed, since it must make a worst case estimate not knowing which physical blocks will be needed, but it is much more accurate than before. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Split uninitialized extents for direct I/OMingming Cao2009-09-28
| | | | | | | | | | | | | When writing into an unitialized extent via direct I/O, and the direct I/O doesn't exactly cover the unitialized extent, split the extent into uninitialized and initialized extents before submitting the I/O. This avoids needing to deal with an ENOSPC error in the end_io callback that gets used for direct I/O. When the IO is complete, the written extent will be marked as initialized. Singed-Off-By: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: replace MAX_DEFRAG_SIZE with EXT_MAX_BLOCKEric Sandeen2009-09-17
| | | | | | | | | There's no reason to redefine the maximum allowable offset in an extent-based file just for defrag; EXT_MAX_BLOCK already does this. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Show unwritten extent flag in ext4_ext_show_leaf()Mingming2009-09-18
| | | | | | | | | | | | ext4_ext_show_leaf() will display the leaf extents when extent debugging is enabled. Printing out the unwritten bit is useful for debugging unwritten extent, allow us to see the unwritten extents vs written extents, after the unwritten extents are splitted or converted. Signed-off-by: Mingming Cao <cmm@us.ibm.com>
* ext4: online defrag -- Add EXT4_IOC_MOVE_EXT ioctlAkira Fujita2009-06-17
| | | | | | | | | | | | The EXT4_IOC_MOVE_EXT exchanges the blocks between orig_fd and donor_fd, and then write the file data of orig_fd to donor_fd. ext4_mext_move_extent() is the main fucntion of ext4 online defrag, and this patch includes all functions related to ext4 online defrag. Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com> Signed-off-by: Takashi Sato <t-sato@yk.jp.nec.com> Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Validate extent details only when read from the diskAneesh Kumar K.V2009-03-27
| | | | | | | | Make sure we validate extent details only when read from the disk. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Thiemo Nagel <thiemo.nagel@ph.tum.de> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Remove i_ext_generation from ext4_inode_info structureTheodore Ts'o2008-11-04
| | | | | | | The i_ext_generation was incremented, but never used. Remove it to slim down the ext4_inode_info structure. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* Hook ext4 to the vfs fiemap interface.Eric Sandeen2008-10-07
| | | | | | | | | | ext4_ext_walk_space() was reinstated to be used for iterating over file extents with a callback; it is used by the ext4 fiemap implementation. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: linux-ext4@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org
* ext4: journal credits reservation fixes for extent file writepageMingming Cao2008-08-19
| | | | | | | | | | | | | | | | | This patch modified the writepage/write_begin credit calculation for extent files, to use the credits caculation helper function. The current calculation of how many index/leaf blocks should be accounted is too conservetive, it always considered the worse case, where the tree level is 5, and in the case of multiple chunk allocations, it always assumed no blocks were dirtied in common across the allocations. This path uses the accurate depth of the inode with some extras to calculate the index blocks, and also less conservative in the case of multiple allocation accounting. Signed-off-by: Mingming Cao <cmm@us.ibm.com> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: delayed allocation ENOSPC handlingMingming Cao2008-07-14
| | | | | | | | | | | | | | | | | | | | This patch does block reservation for delayed allocation, to avoid ENOSPC later at page flush time. Blocks(data and metadata) are reserved at da_write_begin() time, the freeblocks counter is updated by then, and the number of reserved blocks is store in per inode counter. At the writepage time, the unused reserved meta blocks are returned back. At unlink/truncate time, reserved blocks are properly released. Updated fix from Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> to fix the oldallocator block reservation accounting with delalloc, added lock to guard the counters and also fix the reservation for meta blocks. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
* ext4: move headers out of include/linuxChristoph Hellwig2008-04-29
Move ext4 headers out of include/linux. This is just the trivial move, there's some more thing that could be done later. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>