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path: root/include/linux/ext4_fs.h
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* ext4: Convert s_r_blocks_count and s_free_blocks_countAneesh Kumar K.V2007-10-17
| | | | | | | | | | | | | Convert s_r_blocks_count and s_free_blocks_count to s_r_blocks_count_lo and s_free_blocks_count_lo This helps in finding BUGs due to direct partial access of these split 64 bit values Also fix direct partial access in ext4 code Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Convert s_blocks_count to s_blocks_count_loAneesh Kumar K.V2007-10-17
| | | | | | | | | | Convert s_blocks_count to s_blocks_count_lo This helps in finding BUGs due to direct partial access of these split 64 bit values Also fix direct partial access in ext4 code Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
* ext4: Convert bg_inode_bitmap and bg_inode_tableAneesh Kumar K.V2007-10-17
| | | | | | | | | | Convert bg_inode_bitmap and bg_inode_table to bg_inode_bitmap_lo and bg_inode_table_lo. This helps in finding BUGs due to direct partial access of these split 64 bit values Also fix one direct partial access Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
* ext4: Convert bg_block_bitmap to bg_block_bitmap_loAneesh Kumar K.V2007-10-17
| | | | | | | | Convert bg_block_bitmap to bg_block_bitmap_lo This helps in catching some BUGS due to direct partial access of these split fields. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
* ext4: FLEX_BG Kernel support v2.Jose R. Santos2007-10-17
| | | | | | | | | | | | | This feature relaxes check restrictions on where each block groups meta data is located within the storage media. This allows for the allocation of bitmaps or inode tables outside the block group boundaries in cases where bad blocks forces us to look for new blocks which the owning block group can not satisfy. This will also allow for new meta-data allocation schemes to improve performance and scalability. Signed-off-by: Jose R. Santos <jrs@us.ibm.com> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
* ext4: Fix sparse warningsAneesh Kumar K.V2007-10-17
| | | | | Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
* Ext4: Uninitialized Block GroupsAndreas Dilger2007-10-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In pass1 of e2fsck, every inode table in the fileystem is scanned and checked, regardless of whether it is in use. This is this the most time consuming part of the filesystem check. The unintialized block group feature can greatly reduce e2fsck time by eliminating checking of uninitialized inodes. With this feature, there is a a high water mark of used inodes for each block group. Block and inode bitmaps can be uninitialized on disk via a flag in the group descriptor to avoid reading or scanning them at e2fsck time. A checksum of each group descriptor is used to ensure that corruption in the group descriptor's bit flags does not cause incorrect operation. The feature is enabled through a mkfs option mke2fs /dev/ -O uninit_groups A patch adding support for uninitialized block groups to e2fsprogs tools has been posted to the linux-ext4 mailing list. The patches have been stress tested with fsstress and fsx. In performance tests testing e2fsck time, we have seen that e2fsck time on ext3 grows linearly with the total number of inodes in the filesytem. In ext4 with the uninitialized block groups feature, the e2fsck time is constant, based solely on the number of used inodes rather than the total inode count. Since typical ext4 filesystems only use 1-10% of their inodes, this feature can greatly reduce e2fsck time for users. With performance improvement of 2-20 times, depending on how full the filesystem is. The attached graph shows the major improvements in e2fsck times in filesystems with a large total inode count, but few inodes in use. In each group descriptor if we have EXT4_BG_INODE_UNINIT set in bg_flags: Inode table is not initialized/used in this group. So we can skip the consistency check during fsck. EXT4_BG_BLOCK_UNINIT set in bg_flags: No block in the group is used. So we can skip the block bitmap verification for this group. We also add two new fields to group descriptor as a part of uninitialized group patch. __le16 bg_itable_unused; /* Unused inodes count */ __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */ bg_itable_unused: If we have EXT4_BG_INODE_UNINIT not set in bg_flags then bg_itable_unused will give the offset within the inode table till the inodes are used. This can be used by fsck to skip list of inodes that are marked unused. bg_checksum: Now that we depend on bg_flags and bg_itable_unused to determine the block and inode usage, we need to make sure group descriptor is not corrupt. We add checksum to group descriptor to detect corruption. If the descriptor is found to be corrupt, we mark all the blocks and inodes in the group used. Signed-off-by: Avantika Mathur <mathur@us.ibm.com> Signed-off-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
* ext4: remove #ifdef CONFIG_EXT4_INDEXEric Sandeen2007-10-17
| | | | | | | | | | | | CONFIG_EXT4_INDEX is not an exposed config option in the kernel, and it is unconditionally defined in ext4_fs.h. tune2fs is already able to turn off dir indexing, so at this point it's just cluttering up the code. Remove it. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
* ext4: Remove (partial, never completed) fragment supportColy Li2007-10-17
| | | | | | | | | | Fragment support in ext2/3/4 was never implemented, and it probably will never be implemented. So remove it from ext4. Signed-off-by: Coly Li <coyli@suse.de> Acked-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Remove 65000 subdirectory limitAndreas Dilger2007-07-18
| | | | | | | | | | | | | | | | | | | | | | | This patch adds support to ext4 for allowing more than 65000 subdirectories. Currently the maximum number of subdirectories is capped at 32000. If we exceed 65000 subdirectories in an htree directory it sets the inode link count to 1 and no longer counts subdirectories. The directory link count is not actually used when determining if a directory is empty, as that only counts subdirectories and not regular files that might be in there. A EXT4_FEATURE_RO_COMPAT_DIR_NLINK flag has been added and it is set if the subdir count for any directory crosses 65000. A later fsck will clear EXT4_FEATURE_RO_COMPAT_DIR_NLINK if there are no longer any directory with >65000 subdirs. Signed-off-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: Kalpak Shah <kalpak@clusterfs.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Expand extra_inodes space per the s_{want,min}_extra_isize fields Kalpak Shah2007-07-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need to make sure that existing ext3 filesystems can also avail the new fields that have been added to the ext4 inode. We use s_want_extra_isize and s_min_extra_isize to decide by how much we should expand the inode. If EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE feature is set then we expand the inode by max(s_want_extra_isize, s_min_extra_isize , sizeof(ext4_inode) - EXT4_GOOD_OLD_INODE_SIZE) bytes. Actually it is still an open question about whether users should be able to set s_*_extra_isize smaller than the known fields or not. This patch also adds the functionality to expand inodes to include the newly added fields. We start by trying to expand by s_want_extra_isize bytes and if its fails we try to expand by s_min_extra_isize bytes. This is done by changing the i_extra_isize if enough space is available in the inode and no EAs are present. If EAs are present and there is enough space in the inode then the EAs in the inode are shifted to make space. If enough space is not available in the inode due to the EAs then 1 or more EAs are shifted to the external EA block. In the worst case when even the external EA block does not have enough space we inform the user that some EA would need to be deleted or s_min_extra_isize would have to be reduced. Signed-off-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: Kalpak Shah <kalpak@clusterfs.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: Add nanosecond timestampsKalpak Shah2007-07-18
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds nanosecond timestamps for ext4. This involves adding *time_extra fields to the ext4_inode to extend the timestamps to 64-bits. Creation time is also added by this patch. These extended fields will fit into an inode if the filesystem was formatted with large inodes (-I 256 or larger) and there are currently no EAs consuming all of the available space. For new inodes we always reserve enough space for the kernel's known extended fields, but for inodes created with an old kernel this might not have been the case. So this patch also adds the EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE feature flag(ro-compat so that older kernels can't create inodes with a smaller extra_isize). which indicates if the fields fitting inside s_min_extra_isize are available or not. If the expansion of inodes if unsuccessful then this feature will be disabled. This feature is only enabled if requested by the sysadmin. None of the extended inode fields is critical for correct filesystem operation. Signed-off-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: Kalpak Shah <kalpak@clusterfs.com> Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* jbd2: Fix CONFIG_JBD_DEBUG ifdef to be CONFIG_JBD2_DEBUGJose R. Santos2007-07-18
| | | | | | | | | | When the JBD code was forked to create the new JBD2 code base, the references to CONFIG_JBD_DEBUG where never changed to CONFIG_JBD2_DEBUG. This patch fixes that. Signed-off-by: Jose R. Santos <jrs@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* ext4: copy i_flags to inode flags on writeJan Kara2007-07-18
| | | | | | | | | | | | | | Propagate flags such as S_APPEND, S_IMMUTABLE, etc. from i_flags into ext4-specific i_flags. Quota code changes these flags on quota files (to make it harder for sysadmin to screw himself) and these changes were not correctly propagated into the filesystem. (This is a forward port patch from ext3) Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* fallocate support in ext4Amit Arora2007-07-17
| | | | | | | | | | | | This patch implements ->fallocate() inode operation in ext4. With this patch users of ext4 file systems will be able to use fallocate() system call for persistent preallocation. Current implementation only supports preallocation for regular files (directories not supported as of date) with extent maps. This patch does not support block-mapped files currently. Only FALLOC_ALLOCATE and FALLOC_RESV_SPACE modes are being supported as of now. Signed-off-by: Amit Arora <aarora@in.ibm.com>
* Define/reserve new ext4 superblock fieldsTheodore Ts'o2007-05-31
| | | | Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* EXT4: Fix whitespaceDave Kleikamp2007-05-31
| | | | | | | Replace a lot of spaces with tabs Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
* [PATCH] mark struct inode_operations const 3Arjan van de Ven2007-02-12
| | | | | | | | | | | Many struct inode_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [PATCH] ext4 uninline ext4_get_group_no_and_offset()Andrew Morton2006-10-11
| | | | | | | | Way too big to inline. Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext4: move block number hi bitsAlexandre Ratchov2006-10-11
| | | | | | | | | | move '_hi' bits of block numbers in the larger part of the block group descriptor structure Signed-off-by: Alexandre Ratchov <alexandre.ratchov@bull.net> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext4: allow larger descriptor sizeAlexandre Ratchov2006-10-11
| | | | | | | | | make block group descriptor larger. Signed-off-by: Alexandre Ratchov <alexandre.ratchov@bull.net> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext4: 64bit metadataLaurent Vivier2006-10-11
| | | | | | | | | | In-kernel super block changes to support >32 bit free blocks numbers. Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Alexandre Ratchov <alexandre.ratchov@bull.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext4: 48bit i_file_aclBadari Pulavarty2006-10-11
| | | | | | | | | | | | As we are planning to support 48-bit block numbers for ext4, we need to support 48-bit block numbers for extended attributes. In the short term, we can do this by reuse (on-disk) 16-bit padding (linux2.i_pad1 currently used only by "hurd") as high order bits for xattr. This patch basically does that. Signed-off-by: Badari Pulavarty <pbadari@us.ibm.com> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext4: switch fsblk to sector_tMingming Cao2006-10-11
| | | | | | | | | | Redefine ext3 in-kernel filesystem block type (ext3_fsblk_t) from unsigned long to sector_t, to allow kernel to handle >32 bit ext3 blocks. Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext3: add extent map supportAlex Tomas2006-10-11
| | | | | | | | | | | | | | | | | | | On disk extents format: /* * this is extent on-disk structure * it's used at the bottom of the tree */ struct ext3_extent { __le32 ee_block; /* first logical block extent covers */ __le16 ee_len; /* number of blocks covered by extent */ __le16 ee_start_hi; /* high 16 bits of physical block */ __le32 ee_start; /* low 32 bigs of physical block */ }; Signed-off-by: Alex Tomas <alex@clusterfs.com> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext4: rename ext4 symbols to avoid duplication of ext3 symbolsMingming Cao2006-10-11
| | | | | | | | | | Mingming Cao originally did this work, and Shaggy reproduced it using some scripts from her. Signed-off-by: Mingming Cao <cmm@us.ibm.com> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ext4: initial copy of files from ext3Dave Kleikamp2006-10-11
Start of the ext4 patch series. See Documentation/filesystems/ext4.txt for details. This is a simple copy of the files in fs/ext3 to fs/ext4 and /usr/incude/linux/ext3* to /usr/include/ex4* Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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