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406 Commits

Author SHA1 Message Date
Giuseppe Scrivano
62abdcf00f
readdir: use mode from uppermost layer 
differently than dev/ino number, use the uppermost mode found.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-20 22:06:41 +02:00
Giuseppe Scrivano
9f6f90a6da
direct: use statx when available 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-20 22:06:40 +02:00
Giuseppe Scrivano
b28a23a39d
fuse-overlayfs: add plugin system 
Add a simple plugin mechanism that will help to expand fuse-overlayfs
functionalities, in particular it allows to load data from a layer on
demand.

A plugin is loaded into fuse-overlayfs using the option:

-o plugins=path/to/plugin.so:path/to/another/plugin.so

A layer can use a plugin with the syntax:

-o lowerdir=//plugin-name/DATA-FOR-THE-PLUGIN/path

Each time a file/directory is looked up, if a plugin is registered for
a layer, the plugin is first notified about the request.

After the callback is invoked, fuse-overlayfs still expects the data
to be accessible at the specified directory.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-20 22:06:39 +02:00
Giuseppe Scrivano
c2c2ac5b82
main: split the code in multiple files 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-20 19:44:20 +02:00
Giuseppe Scrivano
53c165e6bd
main: refactor to use a data store 
this is the first step towards supporting data from lower layers
coming from other sources.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-20 19:44:20 +02:00
Giuseppe Scrivano
e72f92bcf6
main: fix debug format string 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-20 19:43:23 +02:00
Giuseppe Scrivano
c9bbc94ab6
fuse-overlayfs: support running without upper layer 
when there is no upper layer specified, fail every read operation with
EROFS.

Closes: https://github.com/containers/fuse-overlayfs/issues/100

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-19 21:33:35 +02:00
Giuseppe Scrivano
45c902ea87
main.c: reload the directory on stat 
make sure the directory is reloaded so the correct number of links can
be retrieved.

Closes: https://github.com/containers/fuse-overlayfs/issues/131

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-15 12:55:55 +02:00
Daniel J Walsh
504862881f
Merge pull request #129 from giuseppe/skip-whiteout-creation-if-not-needed 
main: skip whiteout creation if not needed
 2019-10-03 14:17:38 -04:00
Daniel J Walsh
a9f6140602
Merge pull request #128 from giuseppe/restore-suid-on-cacheback-write 
writeback: restore suid mode after write
 2019-10-03 14:17:18 -04:00
Giuseppe Scrivano
3a31451fe3
main: skip whiteout creation if not needed 
if the file is present only on the upper layer, do not create a
whiteout when it is created.  Previously it was looking only at the
parent directory.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-03 16:11:45 +02:00
Giuseppe Scrivano
86b9cf5a83
writeback: restore suid mode after write 
restore the inode mode if there is a writepage request that could
reset the setuid bit.

Closes: https://github.com/containers/fuse-overlayfs/issues/127

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-03 16:07:02 +02:00
Giuseppe Scrivano
163510e592
main: store the new mode after chmod 
after a successful chmod, store the new mode for the ino.

Closes: https://github.com/containers/fuse-overlayfs/issues/124

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-10-02 14:22:13 +02:00
Giuseppe Scrivano
614f57d8f6
main: fix skip whiteout deletion optimization 
fix the lookup function to report also a whiteout node, instead of
NULL.  This is required to correctly delete the whiteout file when it
exists.

Closes: https://github.com/containers/fuse-overlayfs/issues/122

Signed-off-by: Giuseppe Scrivano <giuseppe@scrivano.org>
 2019-09-23 22:35:02 +02:00
Giuseppe Scrivano
20e8529c4e
ioctl: do not reuse fi->fh for directories 
for directories, it points to a structure, not an open file
descriptor.

Signed-off-by: Giuseppe Scrivano <giuseppe@scrivano.org>
 2019-09-23 22:34:20 +02:00
Giuseppe Scrivano
b0a9bdaa64
Merge pull request #120 from giuseppe/setattr-no-require-wronly 
set_attrs: don't require write to S_IFREG
 2019-09-18 13:27:51 +02:00
Nathaniel Wesley Filardo
69dcdb3af2
set_attrs: don't require write to S_IFREG 
It's perfectly possible to set attributes by being the file's owner; one
does not need write access to the contents.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-09-13 15:06:14 +02:00
Tyler Ramer
4a9906739a Fix typo in set_limits 
- Setting and getting nofile not process limits

Authored-by: Tyler Ramer <tramer@pivotal.io>
 2019-09-11 09:17:37 -04:00
Giuseppe Scrivano
ed99282f27
main: check whether writeback is supported 
disable writeback if it is not supported by FUSE.

Closes: https://github.com/containers/fuse-overlayfs/issues/116

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-09-09 17:58:26 +02:00
Giuseppe Scrivano
35499daa30
main: use st_dev for the ino key 
when creating the key for the ino, also use the source st_dev.

Closes: https://github.com/containers/fuse-overlayfs/issues/112

Signed-off-by: Giuseppe Scrivano <giuseppe@scrivano.org>
 2019-08-29 23:21:44 +02:00
Giuseppe Scrivano
fc4115f5c4
main: avoid hash map lookup when possible 
skip reading from the inodes hash table if the inode is already
known.

Signed-off-by: Giuseppe Scrivano <giuseppe@scrivano.org>
 2019-08-29 23:02:54 +02:00
Giuseppe Scrivano
7251f20c4b
main: correctly read inode for unix sockets 
correctly read the inode when processing a UNIX socket.

regression introduced by b25bbde64dc5d06373e087d7fae6367acf1fd09e.

Closes: https://github.com/containers/fuse-overlayfs/issues/110

Signed-off-by: Giuseppe Scrivano <giuseppe@scrivano.org>
 2019-08-25 23:06:32 +02:00
Giuseppe Scrivano
b25bbde64d
main: introduce inodes cache 
introduce a hash map to refer from an inode to the file paths.
A recent change where we enable FUSE writeback by default uncovered an
underlying issue in fuse-overlayfs where changes to a file with
multiple links would not be visible from the other link.

For each inode, maintain a list of nodes that refer to it, so that we
can still access it when a link is removed and more importantly we can
use the inode value with FUSE.

Closes: https://github.com/containers/fuse-overlayfs/issues/108
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1744109

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-08-23 15:27:12 +02:00
Giuseppe Scrivano
9e110ad55c
main, listxattr: open the file in read only mode 
Signed-off-by: Giuseppe Scrivano <giuseppe@scrivano.org>
 2019-08-15 23:14:25 +02:00
Giuseppe Scrivano
08136d8826
main: if the path is a dir, work on the proc path 
when reading xattr, if the path cannot be open as it is a directory,
operate on the /proc/fd/FD path.

Closes: https://github.com/containers/fuse-overlayfs/issues/104

Signed-off-by: Giuseppe Scrivano <giuseppe@scrivano.org>
 2019-08-15 21:55:25 +02:00
Giuseppe Scrivano
3b27676c88
main: use cached st_mode 
node already keeps st_mode in cache so there is no need of the
additional stat to find out the file type.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-08-11 23:44:57 +02:00
Giuseppe Scrivano
1faf62ce32
main: simplify setattr 
always use the /proc/self/fd/FD path when the path doesn't refer to a
directory or regular file.

commit 0b0c7a3a01dae4de65ba79016a111d794c1d1719 introduced the
regression.

Closes: https://github.com/containers/fuse-overlayfs/issues/99

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-08-07 23:58:06 +02:00
Giuseppe Scrivano
5e325f7d9c
main: fix type for flistxattr return 
the return type is ssize_t, not size_t.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-31 16:26:01 +02:00
Giuseppe Scrivano
56cc4d3d61
main: fix warnings reported by lgtm.com 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-29 13:36:07 +02:00
Giuseppe Scrivano
cf86b89adc
main: open the fd correctly for reading xattrs 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-29 13:35:23 +02:00
Giuseppe Scrivano
cecbcbb7ad
main: make sure the work directory is empty 
make sure the work directory is empty when fuse-overlayfs starts.

Closes: https://github.com/containers/fuse-overlayfs/issues/93

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-29 13:35:22 +02:00
Giuseppe Scrivano
4e32e8907d
main: fix fd validity check 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 17:56:30 +02:00
Giuseppe Scrivano
45b8bb85d4
main, rename: use cleanup_close 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 17:50:58 +02:00
Giuseppe Scrivano
74f047933b
main: mark dir loaded only if timeout>0 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 16:10:07 +02:00
Giuseppe Scrivano
49c88306d7
main, open: avoid a stat when creating a file 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 15:46:55 +02:00
Giuseppe Scrivano
1a3ae79283
main: fix memory leak 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 15:46:54 +02:00
Giuseppe Scrivano
22246f29f3
main, xattr: fix memory leak 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 15:46:54 +02:00
Giuseppe Scrivano
7e54c97400
main: fix read after free 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 15:46:53 +02:00
Giuseppe Scrivano
79c802f61e
main, open: avoid a lookup if the node is known 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 10:12:11 +02:00
Giuseppe Scrivano
80a0260043
file, open: do not double close fd 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 10:12:10 +02:00
Giuseppe Scrivano
dd744c7fc2
file, open: avoid deleting the whiteout if possible 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 10:12:09 +02:00
Giuseppe Scrivano
6dbc45b821
file, open: create directly the file if possible 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-25 10:12:08 +02:00
Giuseppe Scrivano
348f60a277
file, open: move code to create a file to its function 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-24 17:05:51 +02:00
Giuseppe Scrivano
2404d5f9b1
main, mkdir: create directly the directory if possible 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-24 16:38:01 +02:00
Giuseppe Scrivano
3286532636
main, symlink: avoid a chown if it is not needed 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-24 16:10:14 +02:00
Giuseppe Scrivano
a77edee351
main, open: avoid a chown if it is not needed 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-24 16:09:08 +02:00
Giuseppe Scrivano
0749dd7fb8
main, copyup: avoid a chown if it is not needed 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-24 16:04:38 +02:00
Giuseppe Scrivano
74fa25112a
main, mkdir: avoid a chown if it is not needed 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-24 16:03:58 +02:00
Giuseppe Scrivano
1395753e1a
main, fsync: if fsync is disabled return ENOSYS 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-23 16:14:40 +02:00
Giuseppe Scrivano
99206771b5
main, symlink: skip delete whiteout if not needed 
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
 2019-07-23 16:14:39 +02:00