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Create helper functions to deal with locking realtime metadata inodes.
This enables us to maintain correct locking order once we start adding
the realtime rmap and refcount btree inodes.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create get and set functions for rtsummary words so that we can redefine
the ondisk format with a specific endianness. Note that this requires
the definition of a distinct type for ondisk summary info words so that
the compiler can perform proper typechecking.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create helper functions that compute the number of blocks or words
necessary to store the rt summary file.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create helper functions that compute the number of blocks or words
necessary to store the rt bitmap.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Convert the realtime summary file macros to helper functions so that we
can improve type checking.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Replace these macros with typechecked helper functions. Eventually
we're going to add more logic to the helpers and it'll be easier if we
don't have to macro it up.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Convert these calls to use the helpers, and clean up all these places
where the same variable can have different units depending on where it
is in the function.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create a helper to compute the misalignment between a file extent
(xfs_extlen_t) and a realtime extent.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create a helper to convert a realtime extent to a realtime block. Later
on we'll change the helper to use bit shifts when possible.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Further disambiguate the xfs_rtblock_t uses by creating a new type,
xfs_rtxnum_t, to store the position of an extent within the realtime
section, in units of rtextents.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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This helper function validates that a range of *blocks* in the
realtime section is completely contained within the realtime section.
It does /not/ validate ranges of *rtextents*. Rename the function to
avoid suggesting that it does, and change the type of the @len parameter
since xfs_rtblock_t is a position unit, not a length unit.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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XFS uses xfs_rtblock_t for many different uses, which makes it much more
difficult to perform a unit analysis on the codebase. One of these
(ab)uses is when we need to store the length of a free space extent as
stored in the realtime bitmap. Because there can be up to 2^64 realtime
extents in a filesystem, we need a new type that is larger than
xfs_rtxlen_t for callers that are querying the bitmap directly. This
means scrub and growfs.
Create this type as "xfs_rtbxlen_t" and use it to store 64-bit rtx
lengths. 'b' stands for 'bitmap' or 'big'; reader's choice.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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We should use xfs_fileoff_t to store the file block offset of any
location within the realtime bitmap or summary files.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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In most of the filesystem, we use xfs_extlen_t to store the length of a
file (or AG) space mapping in units of fs blocks. Unfortunately, the
realtime allocator also uses it to store the length of a rt space
mapping in units of rt extents. This is confusing, since one rt extent
can consist of many fs blocks.
Separate the two by introducing a new type (xfs_rtxlen_t) to store the
length of a space mapping (in units of realtime extents) that would be
found in a file.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Move all the declarations for functionality in xfs_rtbitmap.c into a
separate xfs_rtbitmap.h header file.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create a pair of helpers to deal with setting up the necessary incore
context to check metadata records against the realtime metadata. Right
now this is limited to locking the realtime bitmap and summary inodes,
but as we add rmap and reflink to the realtime device this will grow to
include btree cursors.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Add some logic to xfs_iroot_realloc so that we can handle leaf records
in the btree root block correctly.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Replace all the shouty bmap btree and bmap disk root macros with actual
functions, and fix a type handling error in the xattr code that the
macros previously didn't care about.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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When metadata directories are enabled, the rt and quota inodes are no
longer pointed to by the superblock, so it doesn't make sense to check
these.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Enhance the inode link count online fsck code alter their behavior when
they detect metadata directory tree roots, just like they do for the
regular root directory.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Teach online scrub about the metadata directory tree.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Metadata inodes are private files and therefore cannot be exposed to
userspace. This means no bulkstat, no open-by-handle, no linking them
into the directory tree, and no feeding them to LSMs. As such, we mark
them S_PRIVATE, which stops all that.
While we're at it, put them in a separate lockdep class so that it won't
get confused by "recursive" i_rwsem locking such as what happens when we
write to a rt file and need to allocate from the rt bitmap file.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Ideally, we'd put all the metadata inodes in one place if we could, so
that the metadata all stay reasonably close together instead of
spreading out over the disk. Furthermore, if the log is internal we'd
probably prefer to keep the metadata near the log. Therefore, disable
AGI rotoring for metadata inode allocations.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Add checks for the metadata inode flag so that we don't ever leak
metadata inodes out to userspace, and we don't ever try to read a
regular inode as metadata.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create a helper that calls dqalloc to allocate and grab a reference to
dquots for the user, group, and project ids listed in an icreate
structure. This simplifies the creat-related dqalloc callsites
scattered around the code base.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Callers that want to create an inode currently pass all possible file
attribute values for the new inode into xfs_init_new_inode as ten
separate parameters. This causes two code maintenance issues: first, we
have large multi-line call sites which programmers must read carefully
to make sure they did not accidentally invert a value. Second, all
three file id parameters must be passed separately to the quota
functions; any discrepancy results in quota count errors.
Clean this up by creating a new icreate_args structure to hold all this
information, some helpers to initialize them properly, and make the
callers pass this structure through to the creation function, whose name
we shorten to xfs_icreate. This eliminates the issues, enables us to
keep the inode init code in sync with userspace via libxfs, and is
needed for future metadata directory tree management.
(A subsequent cleanup will also fix the quota alloc calls.)
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Teach the AGI repair code to rebuild the unlinked buckets and lists.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Save ~460 bytes of stack space by moving all the repair context to a
heap object. We're going to add even more context data in the next
patch, which is why we really need to do this now.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Look for corruptions in the AGI unlinked bucket chains.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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If a symbolic link target looks bad, try to sift through the rubble to
find as much of the target buffer that we can, and stage a new target
(short or remote format as needed) in a temporary file and use the
atomic extent swapping mechanism to commit the results.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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When the orphanage adopts a file, that file becomes a child of the
orphanage. The dentry cache may have entries for the orphanage
directory and the name we've chosen, so (1) make sure we abort if the
dcache has a positive entry because something's not right; and (2)
invalidate and purge negative dentries if the adoption goes through.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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If we encounter an inode with a nonzero link count but zero observed
links, move it to the orphanage.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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If we can't find a parent for a file, move it to the orphanage.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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It's possible that the dentry cache can tell us the parent of a
directory. Therefore, when repairing directory dot dot entries, query
the dcache as a last resort before scanning the entire filesystem.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Teach the online repair code to fix directory '..' entries (aka
directory parent pointers). Since this requires us to know how to scan
every dirent in every directory on the filesystem, we can reuse the
parent scanner components to validate (or find!) the correct parent
entry when rebuilding directories too.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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If a directory looks like it's in bad shape, try to sift through the
rubble to find whatever directory entries we can, scan the directory
tree for the parent (if needed), stage the new directory contents in a
temporary file and use the atomic extent swapping mechanism to commit
the results in bulk. As a side effect of this patch, directory
inactivation will be able to purge any leftover dir blocks.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Empty xattr leaf blocks at offset zero are a waste of space but
otherwise harmless. If we encounter one, flag it as an opportunity for
optimization.
If we encounter empty attr leaf blocks anywhere else in the attr fork,
that's corruption.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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If an attr block indicates that it could use compaction, set the preen
flag to have the attr fork rebuilt, since the attr fork rebuilder can
take care of that for us.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
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If the extended attributes look bad, try to sift through the rubble to
find whatever keys/values we can, stage a new attribute structure in a
temporary file and use the atomic extent swapping mechanism to commit
the results in bulk.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Build on the code that was recently added to the temporary repair file
code so that we can atomically switch the contents of any file fork,
even if the fork is in local format. The upcoming functions to repair
xattrs, directories, and symlinks will need that capability.
Repair can lock out access to these user files by holding IOLOCK_EXCL on
these user files. Therefore, it is safe to drop the ILOCK of both the
file being repaired and the tempfile being used for staging, and cancel
the scrub transaction. We do this so that we can reuse the resource
estimation and transaction allocation functions used by a regular file
exchange operation.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create a simple 'blob array' data structure for storage of arbitrarily
sized metadata objects that will be used to reconstruct metadata. For
the intended usage (temporarily storing extended attribute names and
values) we only have to support storing objects and retrieving them.
Use the xfile abstraction to store the attribute information in memory
that can be swapped out.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Port the existing directory freespace block header checking function to
accept an owner number instead of an xfs_inode, then update the
callsites to use xfs_da_args.owner when possible.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Port the existing directory block header checking function to accept an
owner number instead of an xfs_inode, then update the callsites to use
xfs_da_args.owner when possible.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Port the existing directory data header checking function to accept an
owner number instead of an xfs_inode, then update the callsites to use
xfs_da_args.owner when possible.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Check the owner field of directory leaf blocks.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create a leaf block header checking function to validate the owner field
of xattr leaf blocks.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Add an explicit owner field to xfs_da_args, which will make it easier
for online fsck to set the owner field of the temporary directory and
xattr structures that it builds to repair damaged metadata.
Note: I hopefully found all the xfs_da_args definitions by looking for
automatic stack variable declarations and xfs_da_args.dp assignments:
git grep -E '(args.*dp =|struct xfs_da_args[[:space:]]*[a-z0-9][a-z0-9]*)'
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Repair the realtime summary data by constructing a new rtsummary file in
the scrub temporary file, then atomically swapping the contents.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create some new routines to exchange the contents of a temporary file
created to stage a repair with another ondisk file. This will be used
by the realtime summary repair function to commit atomically the new
rtsummary data, which will be staged in the tempfile.
The rest of XFS coordinates access to the realtime metadata inodes
solely through the ILOCK. For repair to hold its exclusive access to
the realtime summary file, it has to allocate a single large transaction
and roll it repeatedly throughout the repair while holding the ILOCK.
In turn, this means that for now there's only a partial swapext
implementation for the temporary file, because we can only work within
an existing transaction. Hence the only tempswap functions needed here
are to estimate the resource requirements of swapext between, reserve
more space/quota to an existing transaction, and kick off the actual
swap. The rest will be added in a later patch in preparation for
repairing xattrs and directories.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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Create the routines we need to preallocate space in a temporary ondisk
file and then copy the contents of an xfile into the tempfile. The
upcoming rtsummary repair feature will construct the contents of a
realtime summary file in memory, after which it will want to copy all
that into the ondisk temporary file before atomically committing the new
rtsummary contents.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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