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* Update comment to explain search order reverted to historical ordermckusick2014-03-221-10/+11
| | | | | | | in -r254996. Suggested by: Pedro Giffuni <pfg@FreeBSD.org> MFC: 3 days
* Update kernel inclusions of capability.h to use capsicum.h instead; somerwatson2014-03-161-1/+1
| | | | | | | | further refinement is required as some device drivers intended to be portable over FreeBSD versions rely on __FreeBSD_version to decide whether to include capability.h. MFC after: 3 weeks
* - If we fail to do a non-blocking acquire of a buf lock while doing ajeff2014-03-061-2/+10
| | | | | | | | | | | | | waiting sync pass we need to do a blocking acquire and restart. Another thread, typically the buf daemon, may have this buf locked and if we don't wait we can fail to sync the file. This lead to a great variety of softdep panics because we rely on all dependencies being flushed before proceeding in several cases. Reported by: pho Discussed with: mckusick Sponsored by: EMC / Isilon Storage Division MFC after: 2 weeks
* - Gracefully handle truncation failures when trying to shrink directories.jeff2014-03-061-3/+6
| | | | | | | | | | This could cause dirhash panics since the dirhash state would be successfully truncated while the directory was not. Reported by: pho Discussed with: mckusick Sponsored by: EMC / Isilon Storage Division MFC after: 2 weeks
* ufs: small formatting fixes.pfg2014-03-0217-196/+196
| | | | | | | | | Cleanup some extra space. Use of tabs vs. spaces. No functional change. MFC after: 3 days Reviewed by: mckusick
* Fine tune filesystem block allocations under low free-spacemckusick2013-12-301-4/+4
| | | | | | | | conditions (-r254995) based on further operational experience. Submitted by: Dmitry Sivachenko Fix Tested by: Dmitry Sivachenko MFC after: 2 weeks
* Properly handle unsigned comparison.mckusick2013-12-301-10/+4
| | | | MFC after: 2 weeks
* We needlessly panic when trying to flush MKDIR_PARENT dependencies.mckusick2013-12-011-2/+20
| | | | | | | | | | | | | | | We had previously tried to flush all MKDIR_PARENT dependencies (and all the NEWBLOCK pagedeps) by calling ffs_update(). However this will only resolve these dependencies in direct blocks. So very large directories with MKDIR_PARENT dependencies in indirect blocks had not yet gotten flushed. As the directory is in the midst of doing a complete sync, we simply defer the checking of the MKDIR_PARENT dependencies until the indirect blocks have been sync'ed. Reported by: Shawn Wallbridge of imaginaryforces.com Tested by: John-Mark Gurney <jmg@funkthat.com> PR: 183424 MFC after: 2 weeks
* fix white space...jmg2013-11-201-1/+1
| | | | MFC after: 1 week
* fix a use after free, jsegdep_merge will free wk, avoid the next check...jmg2013-11-201-1/+1
| | | | | | | CID: 1006098 Sponsored by: Imaginary Forces Reviewed by: mckusick MFC after: 1 week
* UFS2: make di_extsize unsigned.pfg2013-10-242-4/+5
| | | | | | | | di_extsize is the EA size and as such it should be unsigned. Adjust related types for consistency. Reviewed by: mckusick (previous version) MFC after: 3 weeks
* Allow kernels without options SOFTUPDATES to build. This should fix thebrooks2013-10-211-0/+2
| | | | | | embedded tinderboxes. Reviewed by: emaste
* Fix build problem on ARM (which defaults to building without soft updates).mckusick2013-10-211-4/+4
| | | | | Reported by: Tinderbox Sponsored by: Netflix
* Restructuring of the soft updates code to set it up so that themckusick2013-10-213-622/+872
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | single kernel-wide soft update lock can be replaced with a per-filesystem soft-updates lock. This per-filesystem lock will allow each filesystem to have its own soft-updates flushing thread rather than being limited to a single soft-updates flushing thread for the entire kernel. Move soft update variables out of the ufsmount structure and into their own mount_softdeps structure referenced by ufsmount field um_softdep. Eventually the per-filesystem lock will be in this structure. For now there is simply a pointer to the kernel-wide soft updates lock. Change all instances of ACQUIRE_LOCK and FREE_LOCK to pass the lock pointer in the mount_softdeps structure instead of a pointer to the kernel-wide soft-updates lock. Replace the five hash tables used by soft updates with per-filesystem copies of these tables allocated in the mount_softdeps structure. Several functions that flush dependencies when too many are allocated in the kernel used to operate across all filesystems. They are now parameterized to flush dependencies from a specified filesystem. For now, we stick with the round-robin flushing strategy when the kernel as a whole has too many dependencies allocated. While there are many lines of changes, there should be no functional change in the operation of soft updates. Tested by: Peter Holm and Scott Long Sponsored by: Netflix
* Fourth of several cleanups to soft dependency implementation.mckusick2013-10-201-24/+123
| | | | | | | | | | | | Add KASSERTS that soft dependency functions only get called for filesystems running with soft dependencies. Calling these functions when soft updates are not compiled into the system become panic's. No functional change. Tested by: Peter Holm and Scott Long Sponsored by: Netflix
* Third of several cleanups to soft dependency implementation.mckusick2013-10-202-10/+16
| | | | | | | | | | Ensure that softdep_unmount() and softdep_setup_sbupdate() only get called for filesystems running with soft dependencies. No functional change. Tested by: Peter Holm and Scott Long Sponsored by: Netflix
* Second of several cleanups to soft dependency implementation.mckusick2013-10-202-36/+0
| | | | | | | | | Delete two unused functions in ffs_sofdep.c. No functional change. Tested by: Peter Holm and Scott Long Sponsored by: Netflix
* First of several cleanups to soft dependency implementation.mckusick2013-10-202-6/+6
| | | | | | | | | | Convert three functions exported from ffs_softdep.c to static functions as they are not used outside of ffs_softdep.c. No functional change. Tested by: Peter Holm and Scott Long Sponsored by: Netflix
* Make di_blocks unsigned in UFS1 as is the case already for UFS2.pfg2013-10-141-1/+1
| | | | | | | | | Most of the code between UFS1 and UFS2 is shared so this change is pretty safe. Not only this makes UFS1 and 2 consistent but it also matches what NetBSD and MacOS X have for some years now. Reviewed by: mckusick MFC after: 1 month
* Change the cap_rights_t type from uint64_t to a structure that we can extendpjd2013-09-051-3/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | in the future in a backward compatible (API and ABI) way. The cap_rights_t represents capability rights. We used to use one bit to represent one right, but we are running out of spare bits. Currently the new structure provides place for 114 rights (so 50 more than the previous cap_rights_t), but it is possible to grow the structure to hold at least 285 rights, although we can make it even larger if 285 rights won't be enough. The structure definition looks like this: struct cap_rights { uint64_t cr_rights[CAP_RIGHTS_VERSION + 2]; }; The initial CAP_RIGHTS_VERSION is 0. The top two bits in the first element of the cr_rights[] array contain total number of elements in the array - 2. This means if those two bits are equal to 0, we have 2 array elements. The top two bits in all remaining array elements should be 0. The next five bits in all array elements contain array index. Only one bit is used and bit position in this five-bits range defines array index. This means there can be at most five array elements in the future. To define new right the CAPRIGHT() macro must be used. The macro takes two arguments - an array index and a bit to set, eg. #define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL) We still support aliases that combine few rights, but the rights have to belong to the same array element, eg: #define CAP_LOOKUP CAPRIGHT(0, 0x0000000000000400ULL) #define CAP_FCHMOD CAPRIGHT(0, 0x0000000000002000ULL) #define CAP_FCHMODAT (CAP_FCHMOD | CAP_LOOKUP) There is new API to manage the new cap_rights_t structure: cap_rights_t *cap_rights_init(cap_rights_t *rights, ...); void cap_rights_set(cap_rights_t *rights, ...); void cap_rights_clear(cap_rights_t *rights, ...); bool cap_rights_is_set(const cap_rights_t *rights, ...); bool cap_rights_is_valid(const cap_rights_t *rights); void cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src); void cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src); bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little); Capability rights to the cap_rights_init(), cap_rights_set(), cap_rights_clear() and cap_rights_is_set() functions are provided by separating them with commas, eg: cap_rights_t rights; cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_FSTAT); There is no need to terminate the list of rights, as those functions are actually macros that take care of the termination, eg: #define cap_rights_set(rights, ...) \ __cap_rights_set((rights), __VA_ARGS__, 0ULL) void __cap_rights_set(cap_rights_t *rights, ...); Thanks to using one bit as an array index we can assert in those functions that there are no two rights belonging to different array elements provided together. For example this is illegal and will be detected, because CAP_LOOKUP belongs to element 0 and CAP_PDKILL to element 1: cap_rights_init(&rights, CAP_LOOKUP | CAP_PDKILL); Providing several rights that belongs to the same array's element this way is correct, but is not advised. It should only be used for aliases definition. This commit also breaks compatibility with some existing Capsicum system calls, but I see no other way to do that. This should be fine as Capsicum is still experimental and this change is not going to 9.x. Sponsored by: The FreeBSD Foundation
* In looking at block layouts as part of fixing filesystem blockmckusick2013-08-281-2/+2
| | | | | | | | allocations under low free-space conditions (-r254995), determine that old block-preference search order used before -r249782 worked a bit better. This change reverts to that block-preference search order. MFC after: 2 weeks
* A performance problem was reported in PR kern/181226:mckusick2013-08-281-2/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I have 25TB Dell PERC 6 RAID5 array. When it becomes almost full (10-20GB free), processes which write data to it start eating 100% CPU and write speed drops below 1MB/sec (normally to gives 400MB/sec). The revision at which it first became apparent was http://svnweb.freebsd.org/changeset/base/249782. The offending change reserved an area in each cylinder group to store metadata. The new algorithm attempts to save this area for metadata and allows its use for non-metadata only after all the data areas have been exhausted. The size of the reserved area defaults to half of minfree, so the filesystem reports full before the data area can completely fill. However, in this report, the filesystem has had minfree reduced to 1% thus forcing the metadata area to be used for data. As the filesystem approached full, it had only metadata areas left to allocate. The result was that every block allocation had to scan summary data for 30,000 cylinder groups before falling back to searching up to 30,000 metadata areas. The fix is to give up on saving the metadata areas once the free space reserve drops below 2%. The effect of this change is to use the old algorithm of just accepting the first available block that we find. Since most filesystems use the default 5% minfree, this will have no effect on their operation. For those that want to push to the limit, they will get their crappy block placements quickly. Submitted by: Dmitry Sivachenko Fix Tested by: Dmitry Sivachenko PR: kern/181226 MFC after: 2 weeks
* Take a very small step toward the Century of the Anchovy by increasing theivoras2013-08-281-1/+1
| | | | | time dirhash entries stay in memory before being considered for eviction to 1 minute.
* Expand the use of stat(2) flags to allow storing some Windows/DOSken2013-08-211-3/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | and CIFS file attributes as BSD stat(2) flags. This work is intended to be compatible with ZFS, the Solaris CIFS server's interaction with ZFS, somewhat compatible with MacOS X, and of course compatible with Windows. The Windows attributes that are implemented were chosen based on the attributes that ZFS already supports. The summary of the flags is as follows: UF_SYSTEM: Command line name: "system" or "usystem" ZFS name: XAT_SYSTEM, ZFS_SYSTEM Windows: FILE_ATTRIBUTE_SYSTEM This flag means that the file is used by the operating system. FreeBSD does not enforce any special handling when this flag is set. UF_SPARSE: Command line name: "sparse" or "usparse" ZFS name: XAT_SPARSE, ZFS_SPARSE Windows: FILE_ATTRIBUTE_SPARSE_FILE This flag means that the file is sparse. Although ZFS may modify this in some situations, there is not generally any special handling for this flag. UF_OFFLINE: Command line name: "offline" or "uoffline" ZFS name: XAT_OFFLINE, ZFS_OFFLINE Windows: FILE_ATTRIBUTE_OFFLINE This flag means that the file has been moved to offline storage. FreeBSD does not have any special handling for this flag. UF_REPARSE: Command line name: "reparse" or "ureparse" ZFS name: XAT_REPARSE, ZFS_REPARSE Windows: FILE_ATTRIBUTE_REPARSE_POINT This flag means that the file is a Windows reparse point. ZFS has special handling code for reparse points, but we don't currently have the other supporting infrastructure for them. UF_HIDDEN: Command line name: "hidden" or "uhidden" ZFS name: XAT_HIDDEN, ZFS_HIDDEN Windows: FILE_ATTRIBUTE_HIDDEN This flag means that the file may be excluded from a directory listing if the application honors it. FreeBSD has no special handling for this flag. The name and bit definition for UF_HIDDEN are identical to the definition in MacOS X. UF_READONLY: Command line name: "urdonly", "rdonly", "readonly" ZFS name: XAT_READONLY, ZFS_READONLY Windows: FILE_ATTRIBUTE_READONLY This flag means that the file may not written or appended, but its attributes may be changed. ZFS currently enforces this flag, but Illumos developers have discussed disabling enforcement. The behavior of this flag is different than MacOS X. MacOS X uses UF_IMMUTABLE to represent the DOS readonly permission, but that flag has a stronger meaning than the semantics of DOS readonly permissions. UF_ARCHIVE: Command line name: "uarch", "uarchive" ZFS_NAME: XAT_ARCHIVE, ZFS_ARCHIVE Windows name: FILE_ATTRIBUTE_ARCHIVE The UF_ARCHIVED flag means that the file has changed and needs to be archived. The meaning is same as the Windows FILE_ATTRIBUTE_ARCHIVE attribute, and the ZFS XAT_ARCHIVE and ZFS_ARCHIVE attribute. msdosfs and ZFS have special handling for this flag. i.e. they will set it when the file changes. sys/param.h: Bump __FreeBSD_version to 1000047 for the addition of new stat(2) flags. chflags.1: Document the new command line flag names (e.g. "system", "hidden") available to the user. ls.1: Reference chflags(1) for a list of file flags and their meanings. strtofflags.c: Implement the mapping between the new command line flag names and new stat(2) flags. chflags.2: Document all of the new stat(2) flags, and explain the intended behavior in a little more detail. Explain how they map to Windows file attributes. Different filesystems behave differently with respect to flags, so warn the application developer to take care when using them. zfs_vnops.c: Add support for getting and setting the UF_ARCHIVE, UF_READONLY, UF_SYSTEM, UF_HIDDEN, UF_REPARSE, UF_OFFLINE, and UF_SPARSE flags. All of these flags are implemented using attributes that ZFS already supports, so the on-disk format has not changed. ZFS currently doesn't allow setting the UF_REPARSE flag, and we don't really have the other infrastructure to support reparse points. msdosfs_denode.c, msdosfs_vnops.c: Add support for getting and setting UF_HIDDEN, UF_SYSTEM and UF_READONLY in MSDOSFS. It supported SF_ARCHIVED, but this has been changed to be UF_ARCHIVE, which has the same semantics as the DOS archive attribute instead of inverse semantics like SF_ARCHIVED. After discussion with Bruce Evans, change several things in the msdosfs behavior: Use UF_READONLY to indicate whether a file is writeable instead of file permissions, but don't actually enforce it. Refuse to change attributes on the root directory, because it is special in FAT filesystems, but allow most other attribute changes on directories. Don't set the archive attribute on a directory when its modification time is updated. Windows and DOS don't set the archive attribute in that scenario, so we are now bug-for-bug compatible. smbfs_node.c, smbfs_vnops.c: Add support for UF_HIDDEN, UF_SYSTEM, UF_READONLY and UF_ARCHIVE in SMBFS. This is similar to changes that Apple has made in their version of SMBFS (as of smb-583.8, posted on opensource.apple.com), but not quite the same. We map SMB_FA_READONLY to UF_READONLY, because UF_READONLY is intended to match the semantics of the DOS readonly flag. The MacOS X code maps both UF_IMMUTABLE and SF_IMMUTABLE to SMB_FA_READONLY, but the immutable flags have stronger meaning than the DOS readonly bit. stat.h: Add definitions for UF_SYSTEM, UF_SPARSE, UF_OFFLINE, UF_REPARSE, UF_ARCHIVE, UF_READONLY and UF_HIDDEN. The definition of UF_HIDDEN is the same as the MacOS X definition. Add commented-out definitions of UF_COMPRESSED and UF_TRACKED. They are defined in MacOS X (as of 10.8.2), but we do not implement them (yet). ufs_vnops.c: Add support for getting and setting UF_ARCHIVE, UF_HIDDEN, UF_OFFLINE, UF_READONLY, UF_REPARSE, UF_SPARSE, and UF_SYSTEM in UFS. Alphabetize the flags that are supported. These new flags are only stored, UFS does not take any action if the flag is set. Sponsored by: Spectra Logic Reviewed by: bde (earlier version)
* This bug fix is in a code path in rename taken when there is amckusick2013-08-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | | collision between a rename and an open system call for the same target file. Here, rename releases its vnode references, waits for the open to finish, and then restarts by reacquiring its needed vnode locks. In this case, rename was unlocking but failing to release its reference to one of its held vnodes. The effect was that even after all the actual references to the vnode had gone, the vnode still showed active references. For files that had been removed, their space was not reclaimed until the filesystem was forcibly unmounted. This bug manifested itself in the Postgres server which would leak/lose hundreds of files per day amounting to many gigabytes of disk space. This bug required shutting down Postgres, forcibly unmounting its filesystem, remounting its filesystem and restarting Postgres every few days to recover the lost space. Reported by: Dan Thomas and Palle Girgensohn Bug-fix by: kib Tested by: Dan Thomas and Palle Girgensohn MFC after: 2 weeks
* With the addition of journalled soft updates, the "newblk" structuresmckusick2013-08-051-1/+1
| | | | | | | | | | | | persist much longer than previously. Historically we had at most 100 entries; now the count may reach a million. With the increased count we spent far too much time looking them up in the grossly undersized newblk hash table. Configure the newblk hash table to accurately reflect the number of entries that it must index. Reviewed by: kib Tested by: Peter Holm MFC after: 2 weeks
* To better understand performance problems with journalled soft updates,mckusick2013-08-051-9/+43
| | | | | | | | | | we need to collect the highest level of allocation for each of the different soft update dependency structures. This change collects these statistics and makes them available using `sysctl debug.softdep.highuse'. Reviewed by: kib Tested by: Peter Holm MFC after: 2 weeks
* Update to comments describing block allocation policy.mckusick2013-07-141-7/+6
| | | | Submitted by: Bruce Evans
* Only copy as much bytes as there in superblock, instead of the fullkib2013-07-121-1/+1
| | | | | | | | | | | block copy, when copying the superblock into the snapshot. UFS1 does not align superblock on the block boundary, and bcopy runs off the end of the buffer. Reported by: Andre Albsmeier <Andre.Albsmeier@siemens.com> Reviewed by: mckusick Sponsored by: The FreeBSD Foundation MFC after: 1 week
* Change i_gen in UFS to an unsigned type.pfg2013-07-101-1/+1
| | | | | | | | | | Missing type change from r252435. This fixes a "Stale NFS file handle" error. Reported by: Claude Bisson Tested by: Claude Bisson Pointed hat: pfg
* There are several code sequences likekib2013-07-093-4/+4
| | | | | | | | | | | | | | | | | | | vfs_busy(mp); vfs_write_suspend(mp); which are problematic if other thread starts unmount between two calls. The unmount starts a write, while vfs_write_suspend() drain writers. On the other hand, unmount drains busy references, causing the deadlock. Add a flag argument to vfs_write_suspend and require the callers of it to specify VS_SKIP_UNMOUNT flag, when the call is performed not in the mount path, i.e. the covered vnode is not locked. The suspension is not attempted if VS_SKIP_UNMOUNT is specified and unmount is in progress. Reported and tested by: Andreas Longwitz <longwitz@incore.de> Sponsored by: The FreeBSD Foundation MFC after: 3 weeks
* Make better use of metadata area by avoiding using it for data blocksmckusick2013-07-022-3/+25
| | | | | | that no should no longer immediately follow their indirect blocks. MFC after: 2 weeks
* Style fix: spaces.pfg2013-07-021-1/+1
| | | | | | | Cleanup the incomplete revert. Reported by: bde MFC after: 4 weeks
* Change i_gen in UFS to an unsigned type.pfg2013-07-011-1/+1
| | | | | | | | | | Revert the simplification of the i_gen calculation. It is still a good idea to avoid zero values and for the case of old filesystems there is probably no advantage in using the complete 32 bits anyways. Discussed with: bde MFC after: 4 weeks
* Change i_gen in UFS to an unsigned type.pfg2013-07-011-1/+1
| | | | | | | | | Further simplify the i_gen calculation for older disks. Having a zero here is not really a problem and this is more similar to what is done in newfs_random(). Reported by: Xin Li MFC after: 4 weeks
* Don't assume that UFS on-disk format of a directory is the same asgleb2013-07-012-106/+108
| | | | | | | | | | | | | | | | | | defined by <sys/dirent.h> Always start parsing at DIRBLKSIZ aligned offset, skip first entries if uio_offset is not DIRBLKSIZ aligned. Return EINVAL if buffer is too small for single entry. Preallocate buffer for cookies. Cookies will be replaced with d_off field in struct dirent at later point. Skip entries with zero inode number. Stop mangling dirent in ufs_extattr_iterate_directory(). Reviewed by: kib Sponsored by: Google Summer Of Code 2011
* Change i_gen in UFS to an unsigned type.pfg2013-07-011-1/+1
| | | | | | | Missed format specifier. Reported by: mdf MFC after: 4 weeks
* Change i_gen in UFS to an unsigned type.pfg2013-07-014-5/+5
| | | | | | | | | | | | | In UFS, i_gen is a random generated value and there is not way for it to be negative. Actually, the value of i_gen is just used to match bit patterns and it is of not consequence if the values are signed or not. Following other filesystems, set it to unsigned and use it as such, Discussed by: mckusick Reviewed by: mckusick (previous version) MFC after: 4 weeks
* - Convert the bufobj lock to rwlock.jeff2013-05-314-66/+67
| | | | | | | | | | - Use a shared bufobj lock in getblk() and inmem(). - Convert softdep's lk to rwlock to match the bufobj lock. - Move INFREECNT to b_flags and protect it with the buf lock. - Remove unnecessary locking around bremfree() and BKGRDINPROG. Sponsored by: EMC / Isilon Storage Division Discussed with: mckusick, kib, mdf
* Properly spell sentinel (missed in 250891)mckusick2013-05-221-1/+1
| | | | | | | No functional changes. Spotted by: Navdeep Parhar and Alexey Dokuchaev MFC after: 2 weeks
* Add missing buffer releases (brelse) after bread calls that returnmckusick2013-05-221-2/+6
| | | | | | | | | an error. One could argue that returning a buffer even when it is not valid is incorrect, but bread has always returned a buffer valid or not. Reviewed by: kib MFC after: 2 weeks
* Add missing 28th element to softdep types name array.mckusick2013-05-221-1/+4
| | | | | | Found by: Coverity Scan, CID 1007621 Reviewed by: kib MFC after: 2 weeks
* Null a pointer after it is freed so that when it is returnedmckusick2013-05-221-0/+1
| | | | | | | | | | | the return value is NULL. Based on the returned flags, the return value should never be inspected in the case where NULL is returned, but it is good coding practice not to return a pointer to freed memory. Found by: Coverity Scan, CID 1006096 Reviewed by: kib MFC after: 2 weeks
* Remove a bogus check for a NULL buffer pointer.mckusick2013-05-221-7/+8
| | | | | | | | Add a KASSERT that it is not NULL. Found by: Coverity Scan, CID 1009114 Reviewed by: kib MFC after: 2 weeks
* Properly spell sentinel (not sintenel or sentinal).mckusick2013-05-221-28/+28
| | | | | | | No functional changes. Spotted by: kib MFC after: 2 weeks
* Fix several typoseadler2013-05-121-1/+1
| | | | | | PR: kern/176054 Submitted by: Christoph Mallon <christoph.mallon@gmx.de> MFC after: 3 days
* - Correct mispellings of the word occurrencegabor2013-04-171-1/+1
| | | | Submitted by: Christoph Mallon <christoph.mallon@gmx.de> (via private mail)
* Prepare to replace the buf splay with a trie:jeff2013-04-062-27/+18
| | | | | | | | | | | | | | | | - Don't insert BKGRDMARKER bufs into the splay or dirty/clean buf lists. No consumers need to find them there and it complicates the tree. These flags are all FFS specific and could be moved out of the buf cache. - Use pbgetvp() and pbrelvp() to associate the background and journal bufs with the vp. Not only is this much cheaper it makes more sense for these transient bufs. - Fix the assertions in pbget* and pbrel*. It's not safe to check list pointers which were never initialized. Use the BX flags instead. We also check B_PAGING in reassignbuf() so this should cover all cases. Discussed with: kib, mckusick, attilio Sponsored by: EMC / Isilon Storage Division
* The code in clear_remove() and clear_inodedeps() skips one entrymckusick2013-04-031-4/+4
| | | | | | | | | | | | | | | | in the pagedep and inodedep hash tables. An entry in the table is skipped because 'pagedep_hash' and 'inodedep_hash' hold the size of the hash tables - 1. The chance that this would have any operational failure is extremely unlikely. These funtions only need to find a single entry and are only called when there are too many entries. The chance that they would fail because all the entries are on the single skipped hash chain are remote. Submitted by: Pedro Martelletto Reviewed by: kib MFC after: 2 weeks
* The purpose of this change to the FFS layout policy is to reduce themckusick2013-03-223-70/+175
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | running time for a full fsck. It also reduces the random access time for large files and speeds the traversal time for directory tree walks. The key idea is to reserve a small area in each cylinder group immediately following the inode blocks for the use of metadata, specifically indirect blocks and directory contents. The new policy is to preferentially place metadata in the metadata area and everything else in the blocks that follow the metadata area. The size of this area can be set when creating a filesystem using newfs(8) or changed in an existing filesystem using tunefs(8). Both utilities use the `-k held-for-metadata-blocks' option to specify the amount of space to be held for metadata blocks in each cylinder group. By default, newfs(8) sets this area to half of minfree (typically 4% of the data area). This work was inspired by a paper presented at Usenix's FAST '13: www.usenix.org/conference/fast13/ffsck-fast-file-system-checker Details of this implementation appears in the April 2013 of ;login: www.usenix.org/publications/login/april-2013-volume-38-number-2. A copy of the April 2013 ;login: paper can also be downloaded from: www.mckusick.com/publications/faster_fsck.pdf. Reviewed by: kib Tested by: Peter Holm MFC after: 4 weeks
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