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overlayfs updates for 6.8
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Merge tag 'ovl-update-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs
Pull overlayfs updates from Amir Goldstein:
"This is a very small update with no bug fixes and no new features.
The larger update of overlayfs for this cycle, the re-factoring of
overlayfs code into generic backing_file helpers, was already merged
via Christian.
Summary:
- Simplify/clarify some code
No bug fixes here, just some changes following questions from Al
about overlayfs code that could be a little more simple to follow.
- Overlayfs documentation style fixes
Mainly fixes for ReST formatting suggested by documentation
developers"
* tag 'ovl-update-6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs:
overlayfs.rst: fix ReST formatting
overlayfs.rst: use consistent feature names
ovl: initialize ovl_copy_up_ctx.destname inside ovl_do_copy_up()
ovl: remove redundant ofs->indexdir member
This commit is contained in:
Linus Torvalds
commit
4d925f6057
@ -39,7 +39,7 @@ objects in the original filesystem.
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On 64bit systems, even if all overlay layers are not on the same
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underlying filesystem, the same compliant behavior could be achieved
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with the "xino" feature. The "xino" feature composes a unique object
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identifier from the real object st_ino and an underlying fsid index.
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identifier from the real object st_ino and an underlying fsid number.
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The "xino" feature uses the high inode number bits for fsid, because the
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underlying filesystems rarely use the high inode number bits. In case
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the underlying inode number does overflow into the high xino bits, overlay
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@ -118,7 +118,7 @@ Where both upper and lower objects are directories, a merged directory
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is formed.
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At mount time, the two directories given as mount options "lowerdir" and
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"upperdir" are combined into a merged directory:
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"upperdir" are combined into a merged directory::
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mount -t overlay overlay -olowerdir=/lower,upperdir=/upper,\
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workdir=/work /merged
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@ -172,12 +172,12 @@ directory is being read. This is unlikely to be noticed by many
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programs.
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seek offsets are assigned sequentially when the directories are read.
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Thus if
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Thus if:
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- read part of a directory
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- remember an offset, and close the directory
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- re-open the directory some time later
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- seek to the remembered offset
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- read part of a directory
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- remember an offset, and close the directory
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- re-open the directory some time later
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- seek to the remembered offset
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there may be little correlation between the old and new locations in
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the list of filenames, particularly if anything has changed in the
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@ -290,9 +290,9 @@ Permission checking in the overlay filesystem follows these principles:
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2) task creating the overlay mount MUST NOT gain additional privileges
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3) non-mounting task MAY gain additional privileges through the overlay,
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compared to direct access on underlying lower or upper filesystems
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compared to direct access on underlying lower or upper filesystems
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This is achieved by performing two permission checks on each access
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This is achieved by performing two permission checks on each access:
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a) check if current task is allowed access based on local DAC (owner,
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group, mode and posix acl), as well as MAC checks
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@ -311,11 +311,11 @@ to create setups where the consistency rule (1) does not hold; normally,
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however, the mounting task will have sufficient privileges to perform all
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operations.
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Another way to demonstrate this model is drawing parallels between
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Another way to demonstrate this model is drawing parallels between::
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mount -t overlay overlay -olowerdir=/lower,upperdir=/upper,... /merged
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and
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and::
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cp -a /lower /upper
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mount --bind /upper /merged
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@ -328,7 +328,7 @@ Multiple lower layers
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---------------------
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Multiple lower layers can now be given using the colon (":") as a
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separator character between the directory names. For example:
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separator character between the directory names. For example::
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mount -t overlay overlay -olowerdir=/lower1:/lower2:/lower3 /merged
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@ -340,13 +340,13 @@ rightmost one and going left. In the above example lower1 will be the
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top, lower2 the middle and lower3 the bottom layer.
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Note: directory names containing colons can be provided as lower layer by
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escaping the colons with a single backslash. For example:
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escaping the colons with a single backslash. For example::
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mount -t overlay overlay -olowerdir=/a\:lower\:\:dir /merged
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Since kernel version v6.8, directory names containing colons can also
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be configured as lower layer using the "lowerdir+" mount options and the
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fsconfig syscall from new mount api. For example:
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fsconfig syscall from new mount api. For example::
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fsconfig(fs_fd, FSCONFIG_SET_STRING, "lowerdir+", "/a:lower::dir", 0);
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@ -356,7 +356,7 @@ as an octal characters (\072) when displayed in /proc/self/mountinfo.
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Metadata only copy up
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---------------------
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When metadata only copy up feature is enabled, overlayfs will only copy
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When the "metacopy" feature is enabled, overlayfs will only copy
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up metadata (as opposed to whole file), when a metadata specific operation
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like chown/chmod is performed. Full file will be copied up later when
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file is opened for WRITE operation.
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@ -405,7 +405,7 @@ A normal lower layer is not allowed to be below a data-only layer, so single
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colon separators are not allowed to the right of double colon ("::") separators.
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For example:
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For example::
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mount -t overlay overlay -olowerdir=/l1:/l2:/l3::/do1::/do2 /merged
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@ -419,7 +419,7 @@ to the absolute path of the "lower data" file in the "data-only" lower layer.
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Since kernel version v6.8, "data-only" lower layers can also be added using
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the "datadir+" mount options and the fsconfig syscall from new mount api.
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For example:
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For example::
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fsconfig(fs_fd, FSCONFIG_SET_STRING, "lowerdir+", "/l1", 0);
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fsconfig(fs_fd, FSCONFIG_SET_STRING, "lowerdir+", "/l2", 0);
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@ -429,7 +429,7 @@ For example:
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fs-verity support
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----------------------
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-----------------
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During metadata copy up of a lower file, if the source file has
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fs-verity enabled and overlay verity support is enabled, then the
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@ -492,27 +492,27 @@ though it will not result in a crash or deadlock.
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Mounting an overlay using an upper layer path, where the upper layer path
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was previously used by another mounted overlay in combination with a
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different lower layer path, is allowed, unless the "inodes index" feature
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or "metadata only copy up" feature is enabled.
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different lower layer path, is allowed, unless the "index" or "metacopy"
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features are enabled.
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With the "inodes index" feature, on the first time mount, an NFS file
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With the "index" feature, on the first time mount, an NFS file
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handle of the lower layer root directory, along with the UUID of the lower
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filesystem, are encoded and stored in the "trusted.overlay.origin" extended
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attribute on the upper layer root directory. On subsequent mount attempts,
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the lower root directory file handle and lower filesystem UUID are compared
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to the stored origin in upper root directory. On failure to verify the
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lower root origin, mount will fail with ESTALE. An overlayfs mount with
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"inodes index" enabled will fail with EOPNOTSUPP if the lower filesystem
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"index" enabled will fail with EOPNOTSUPP if the lower filesystem
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does not support NFS export, lower filesystem does not have a valid UUID or
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if the upper filesystem does not support extended attributes.
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For "metadata only copy up" feature there is no verification mechanism at
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For the "metacopy" feature, there is no verification mechanism at
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mount time. So if same upper is mounted with different set of lower, mount
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probably will succeed but expect the unexpected later on. So don't do it.
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It is quite a common practice to copy overlay layers to a different
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directory tree on the same or different underlying filesystem, and even
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to a different machine. With the "inodes index" feature, trying to mount
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to a different machine. With the "index" feature, trying to mount
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the copied layers will fail the verification of the lower root file handle.
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Nesting overlayfs mounts
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@ -547,20 +547,21 @@ filesystem.
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This is the list of cases that overlayfs doesn't currently handle:
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a) POSIX mandates updating st_atime for reads. This is currently not
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done in the case when the file resides on a lower layer.
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a) POSIX mandates updating st_atime for reads. This is currently not
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done in the case when the file resides on a lower layer.
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b) If a file residing on a lower layer is opened for read-only and then
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memory mapped with MAP_SHARED, then subsequent changes to the file are not
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reflected in the memory mapping.
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b) If a file residing on a lower layer is opened for read-only and then
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memory mapped with MAP_SHARED, then subsequent changes to the file are not
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reflected in the memory mapping.
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c) If a file residing on a lower layer is being executed, then opening that
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file for write or truncating the file will not be denied with ETXTBSY.
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c) If a file residing on a lower layer is being executed, then opening that
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file for write or truncating the file will not be denied with ETXTBSY.
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The following options allow overlayfs to act more like a standards
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compliant filesystem:
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1) "redirect_dir"
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redirect_dir
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````````````
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Enabled with the mount option or module option: "redirect_dir=on" or with
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the kernel config option CONFIG_OVERLAY_FS_REDIRECT_DIR=y.
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@ -568,7 +569,8 @@ the kernel config option CONFIG_OVERLAY_FS_REDIRECT_DIR=y.
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If this feature is disabled, then rename(2) on a lower or merged directory
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will fail with EXDEV ("Invalid cross-device link").
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2) "inode index"
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index
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`````
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Enabled with the mount option or module option "index=on" or with the
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kernel config option CONFIG_OVERLAY_FS_INDEX=y.
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@ -577,7 +579,8 @@ If this feature is disabled and a file with multiple hard links is copied
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up, then this will "break" the link. Changes will not be propagated to
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other names referring to the same inode.
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3) "xino"
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xino
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````
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Enabled with the mount option "xino=auto" or "xino=on", with the module
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option "xino_auto=on" or with the kernel config option
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@ -604,7 +607,7 @@ a crash or deadlock.
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Offline changes, when the overlay is not mounted, are allowed to the
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upper tree. Offline changes to the lower tree are only allowed if the
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"metadata only copy up", "inode index", "xino" and "redirect_dir" features
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"metacopy", "index", "xino" and "redirect_dir" features
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have not been used. If the lower tree is modified and any of these
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features has been used, the behavior of the overlay is undefined,
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though it will not result in a crash or deadlock.
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@ -644,12 +647,13 @@ directory inode.
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When encoding a file handle from an overlay filesystem object, the
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following rules apply:
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1. For a non-upper object, encode a lower file handle from lower inode
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2. For an indexed object, encode a lower file handle from copy_up origin
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3. For a pure-upper object and for an existing non-indexed upper object,
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encode an upper file handle from upper inode
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1. For a non-upper object, encode a lower file handle from lower inode
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2. For an indexed object, encode a lower file handle from copy_up origin
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3. For a pure-upper object and for an existing non-indexed upper object,
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encode an upper file handle from upper inode
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The encoded overlay file handle includes:
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- Header including path type information (e.g. lower/upper)
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- UUID of the underlying filesystem
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- Underlying filesystem encoding of underlying inode
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@ -659,15 +663,15 @@ are stored in extended attribute "trusted.overlay.origin".
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When decoding an overlay file handle, the following steps are followed:
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1. Find underlying layer by UUID and path type information.
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2. Decode the underlying filesystem file handle to underlying dentry.
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3. For a lower file handle, lookup the handle in index directory by name.
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4. If a whiteout is found in index, return ESTALE. This represents an
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overlay object that was deleted after its file handle was encoded.
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5. For a non-directory, instantiate a disconnected overlay dentry from the
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decoded underlying dentry, the path type and index inode, if found.
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6. For a directory, use the connected underlying decoded dentry, path type
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and index, to lookup a connected overlay dentry.
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1. Find underlying layer by UUID and path type information.
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2. Decode the underlying filesystem file handle to underlying dentry.
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3. For a lower file handle, lookup the handle in index directory by name.
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4. If a whiteout is found in index, return ESTALE. This represents an
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overlay object that was deleted after its file handle was encoded.
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5. For a non-directory, instantiate a disconnected overlay dentry from the
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decoded underlying dentry, the path type and index inode, if found.
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6. For a directory, use the connected underlying decoded dentry, path type
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and index, to lookup a connected overlay dentry.
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Decoding a non-directory file handle may return a disconnected dentry.
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copy_up of that disconnected dentry will create an upper index entry with
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@ -770,9 +774,9 @@ Testsuite
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There's a testsuite originally developed by David Howells and currently
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maintained by Amir Goldstein at:
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https://github.com/amir73il/unionmount-testsuite.git
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https://github.com/amir73il/unionmount-testsuite.git
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Run as root:
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Run as root::
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# cd unionmount-testsuite
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# ./run --ov --verify
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@ -952,6 +952,13 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
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err = -EIO;
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goto out_free_fh;
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} else {
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/*
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* c->dentry->d_name is stabilzed by ovl_copy_up_start(),
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* because if we got here, it means that c->dentry has no upper
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* alias and changing ->d_name means going through ovl_rename()
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* that will call ovl_copy_up() on source and target dentry.
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*/
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c->destname = c->dentry->d_name;
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/*
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* Mark parent "impure" because it may now contain non-pure
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* upper
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@ -1132,7 +1139,6 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
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if (parent) {
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ovl_path_upper(parent, &parentpath);
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ctx.destdir = parentpath.dentry;
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ctx.destname = dentry->d_name;
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err = vfs_getattr(&parentpath, &ctx.pstat,
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STATX_ATIME | STATX_MTIME,
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@ -460,7 +460,7 @@ static struct dentry *ovl_lookup_real_inode(struct super_block *sb,
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* For decoded lower dir file handle, lookup index by origin to check
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* if lower dir was copied up and and/or removed.
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*/
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if (!this && layer->idx && ofs->indexdir && !WARN_ON(!d_is_dir(real))) {
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if (!this && layer->idx && ovl_indexdir(sb) && !WARN_ON(!d_is_dir(real))) {
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index = ovl_lookup_index(ofs, NULL, real, false);
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if (IS_ERR(index))
|
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return index;
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@ -733,7 +733,7 @@ static struct dentry *ovl_lower_fh_to_d(struct super_block *sb,
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}
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/* Then lookup indexed upper/whiteout by origin fh */
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if (ofs->indexdir) {
|
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if (ovl_indexdir(sb)) {
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index = ovl_get_index_fh(ofs, fh);
|
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err = PTR_ERR(index);
|
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if (IS_ERR(index)) {
|
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|
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@ -754,7 +754,7 @@ struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh)
|
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if (err)
|
||||
return ERR_PTR(err);
|
||||
|
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index = lookup_positive_unlocked(name.name, ofs->indexdir, name.len);
|
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index = lookup_positive_unlocked(name.name, ofs->workdir, name.len);
|
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kfree(name.name);
|
||||
if (IS_ERR(index)) {
|
||||
if (PTR_ERR(index) == -ENOENT)
|
||||
@ -787,7 +787,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
|
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return ERR_PTR(err);
|
||||
|
||||
index = lookup_one_positive_unlocked(ovl_upper_mnt_idmap(ofs), name.name,
|
||||
ofs->indexdir, name.len);
|
||||
ofs->workdir, name.len);
|
||||
if (IS_ERR(index)) {
|
||||
err = PTR_ERR(index);
|
||||
if (err == -ENOENT) {
|
||||
|
||||
@ -63,10 +63,8 @@ struct ovl_fs {
|
||||
struct ovl_sb *fs;
|
||||
/* workbasedir is the path at workdir= mount option */
|
||||
struct dentry *workbasedir;
|
||||
/* workdir is the 'work' directory under workbasedir */
|
||||
/* workdir is the 'work' or 'index' directory under workbasedir */
|
||||
struct dentry *workdir;
|
||||
/* index directory listing overlay inodes by origin file handle */
|
||||
struct dentry *indexdir;
|
||||
long namelen;
|
||||
/* pathnames of lower and upper dirs, for show_options */
|
||||
struct ovl_config config;
|
||||
@ -81,7 +79,6 @@ struct ovl_fs {
|
||||
/* Traps in ovl inode cache */
|
||||
struct inode *workbasedir_trap;
|
||||
struct inode *workdir_trap;
|
||||
struct inode *indexdir_trap;
|
||||
/* -1: disabled, 0: same fs, 1..32: number of unused ino bits */
|
||||
int xino_mode;
|
||||
/* For allocation of non-persistent inode numbers */
|
||||
|
||||
@ -743,10 +743,8 @@ void ovl_free_fs(struct ovl_fs *ofs)
|
||||
unsigned i;
|
||||
|
||||
iput(ofs->workbasedir_trap);
|
||||
iput(ofs->indexdir_trap);
|
||||
iput(ofs->workdir_trap);
|
||||
dput(ofs->whiteout);
|
||||
dput(ofs->indexdir);
|
||||
dput(ofs->workdir);
|
||||
if (ofs->workdir_locked)
|
||||
ovl_inuse_unlock(ofs->workbasedir);
|
||||
|
||||
@ -1169,7 +1169,7 @@ int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir,
|
||||
int ovl_indexdir_cleanup(struct ovl_fs *ofs)
|
||||
{
|
||||
int err;
|
||||
struct dentry *indexdir = ofs->indexdir;
|
||||
struct dentry *indexdir = ofs->workdir;
|
||||
struct dentry *index = NULL;
|
||||
struct inode *dir = indexdir->d_inode;
|
||||
struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = indexdir };
|
||||
|
||||
@ -853,10 +853,8 @@ static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,
|
||||
if (IS_ERR(indexdir)) {
|
||||
err = PTR_ERR(indexdir);
|
||||
} else if (indexdir) {
|
||||
ofs->indexdir = indexdir;
|
||||
ofs->workdir = dget(indexdir);
|
||||
|
||||
err = ovl_setup_trap(sb, ofs->indexdir, &ofs->indexdir_trap,
|
||||
ofs->workdir = indexdir;
|
||||
err = ovl_setup_trap(sb, indexdir, &ofs->workdir_trap,
|
||||
"indexdir");
|
||||
if (err)
|
||||
goto out;
|
||||
@ -869,16 +867,15 @@ static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,
|
||||
* ".overlay.upper" to indicate that index may have
|
||||
* directory entries.
|
||||
*/
|
||||
if (ovl_check_origin_xattr(ofs, ofs->indexdir)) {
|
||||
err = ovl_verify_origin_xattr(ofs, ofs->indexdir,
|
||||
if (ovl_check_origin_xattr(ofs, indexdir)) {
|
||||
err = ovl_verify_origin_xattr(ofs, indexdir,
|
||||
OVL_XATTR_ORIGIN,
|
||||
upperpath->dentry, true,
|
||||
false);
|
||||
if (err)
|
||||
pr_err("failed to verify index dir 'origin' xattr\n");
|
||||
}
|
||||
err = ovl_verify_upper(ofs, ofs->indexdir, upperpath->dentry,
|
||||
true);
|
||||
err = ovl_verify_upper(ofs, indexdir, upperpath->dentry, true);
|
||||
if (err)
|
||||
pr_err("failed to verify index dir 'upper' xattr\n");
|
||||
|
||||
@ -886,7 +883,7 @@ static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,
|
||||
if (!err)
|
||||
err = ovl_indexdir_cleanup(ofs);
|
||||
}
|
||||
if (err || !ofs->indexdir)
|
||||
if (err || !indexdir)
|
||||
pr_warn("try deleting index dir or mounting with '-o index=off' to disable inodes index.\n");
|
||||
|
||||
out:
|
||||
@ -1406,7 +1403,7 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
|
||||
goto out_free_oe;
|
||||
|
||||
/* Force r/o mount with no index dir */
|
||||
if (!ofs->indexdir)
|
||||
if (!ofs->workdir)
|
||||
sb->s_flags |= SB_RDONLY;
|
||||
}
|
||||
|
||||
@ -1415,7 +1412,7 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
|
||||
goto out_free_oe;
|
||||
|
||||
/* Show index=off in /proc/mounts for forced r/o mount */
|
||||
if (!ofs->indexdir) {
|
||||
if (!ofs->workdir) {
|
||||
ofs->config.index = false;
|
||||
if (ovl_upper_mnt(ofs) && ofs->config.nfs_export) {
|
||||
pr_warn("NFS export requires an index dir, falling back to nfs_export=off.\n");
|
||||
|
||||
@ -91,7 +91,7 @@ struct dentry *ovl_indexdir(struct super_block *sb)
|
||||
{
|
||||
struct ovl_fs *ofs = OVL_FS(sb);
|
||||
|
||||
return ofs->indexdir;
|
||||
return ofs->config.index ? ofs->workdir : NULL;
|
||||
}
|
||||
|
||||
/* Index all files on copy up. For now only enabled for NFS export */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user