Before this change if a file was uploaded to a backend which didn't
support modtimes, the time of the file read after the upload had
completed would change to the time the file was uploaded on the
backend.
When using `--vfs-cache-mode writes` or `full` this time would be
different by the `--vfs-write-back` delay which would cause
applications to think the file had been modified.
This changes uses the last modification time read by the OS as a
virtual modtime for backends which don't support setting modtimes. It
does not change the modtime to that actually uploaded.
This means that as long as the file remains in the directory cache it
will have the expected modtime.
See: https://forum.rclone.org/t/saving-files-causes-wrong-modified-time-to-be-set-for-a-few-seconds-on-webdav-mount-with-bitrix24/36451
Before this change, if you renamed a directory containg files yet to
be uploaded then deleted the directory the files would still be
uploaded.
This fixes the problem by changing the directory path in all the file
objects in a directory when it is renamed. This wasn't necessary until
we introduced virtual files and directories which lived beyond the
directory flush mechanism.
Fixes#6809
Before this fix, opening a file with `O_CREATE|O_RDONLY` caused an IO error to
be returned when using `--vfs-cache-mode off` or `--vfs-cache-mode writes`.
This was because the file was opened with read intent, but the `O_CREATE`
implies write intent to create the file even though the file is opened
`O_RDONLY`.
This fix sets write intent for the file if `O_CREATE` is passed in which fixes
the problem for all the VFS cache modes.
It also extends the exhaustive open flags testing to `--vfs-cache-mode writes`
as well as `--vfs-cache-mode full` which would have caught this problem.
See: https://forum.rclone.org/t/i-o-error-trashing-file-on-sftp-mount/34317/
This is possible now that we no longer support go1.12 and brings
rclone into line with standard practices in the Go world.
This also removes errors.New and errors.Errorf from lib/errors and
prefers the stdlib errors package over lib/errors.
Before this change file handles could get closed while the truncate
the file handles loop was running.
This would mean that ocassionally an ECLOSED (which is translated into
EBADF by cmd/mount) would spuriously be returned if Release happened
to happen in the middle of a Truncate call (Setattr called with
size=0).
This change ignores the ECLOSED while truncating file handles.
See: https://forum.rclone.org/t/writes-to-wasabi-mount-failing-with-bad-file-descriptor-intermittently/26321
When using --vfs-cache-mode writes or full if a file was opened for
write intent, the modtime was set and the file was closed without
being modified the modtime would never be written back to storage.
The sequence of events
- app opens file with write intent
- app does set modtime
- rclone sets the modtime on the cache file, but not the remote file
because it is open for write and can't be set yet
- app closes the file without changing it
- rclone doesn't upload the file because the file wasn't changed so
the modtime doesn't get updated
This fixes the problem by making sure any unapplied modtime changes
are applied even if the file is not modified when being closed.
Fixes#4795
Before this change, rclone would return the modification times of the
cache file or the pending modtime which would be more accurate than
the modtime that the backend was capable of.
This meant that the modtime would be change slightly when the item was
actually uploaded.
For example modification times on Google Drive would be rounded to the
nearest millisecond.
This fixes the VFS layer to always return modtimes directly from an
object stored on the remote, or rounded to the precision that the
remote is capable of.
Before this change, rclone would set the modification time of an
object after it had been uploaded. However with --vfs-cache-mode
writes and above, the modification time of the object is already
correct as the cache backing file gets set with the correct
modification time before upload.
Setting the modification time causes another version to be created on
backends such as S3 so it should be avoided if possible.
This change checks to see if the modification time needs changing and
only sets it if necessary.
See: https://forum.rclone.org/t/produce-2-versions-when-overwrite-an-object-in-min-io/19634
Before this change, if a file was created on a remote but deleted
externally from that remote then there was potential for the delete to
never be noticed.
The sequence of events was:
- Create file on VFS - creates virtual directory entry
- File deleted externally to remote before the directory refreshed
- Now the file has a virtual add but is not in the listings so will never disappear
This patch fixes it by removing all virtual directory entries except
the following when the directory is re-read.
- On remotes which can't have empty directories: virtual directory
adds are not flushed. These will remain virtual as long as the
directory is empty.
- For virtual file add: files that are in the process of being
uploaded are not flushed
This patch also adds the distinction between virtually added files and
directories.
It also refactors the virtual directory logic to make it easier to follow.
Fixes#4446
Before this change we set the modtime of the cache file when all
writers had finished.
This has the unfortunate effect that the file is uploaded with the
wrong modtime which means on backends which can't set modtimes except
when uploading files it is wrong.
This change sets the modtime of the cache file immediately in the
cache and in turn sets the modtime in the file info.
Before this change we didn't check the file exists before renaming it,
setting its modification time or deleting it. If the file isn't in the
cache we don't need to do the action since it has been done on the
actual object, so these errors were producing unecessary log messages.
This change checks to see if the file exists first before doing those
actions.
Before this change files that were in the cache and renamed with
--vfs-cache-mode minimal weren't renamed at all.
This fixes the problem and adds tests for all the different
combinations of cache modes and in and out of the cache.
In this commit (released in v1.52.0)
6ca7198f mount: fix disappearing cwd problem
SetSys was introduced to cache node lookups.
Unfortunately taking the vfs.(*Dir) lock in SetSys causes any FUSE
operations on a directory to pile up behind slow directory listings.
In some situations this leads to very high load.
This commit fixes it by using atomic operations to read and write the
Sys value make it independent of the lock.
See: https://forum.rclone.org/t/high-cpu-load-with-rclone-mount/17604
See: #4104
- fix deadlock when cancelling upload
- fix double upload and panic after cancelled upload
- fix cancelation strategy of uploading files
- don't cancel uploads if we don't modify the file
- cancel uploads if we do modify the file
- fix deadlock between Item and writeback
- fix confusion about whether writeback item was being uploaded
- fix cornercases in cancelling uploads and removing files
On file Remove
- cancel any writebacks in progress
- ignore error message deleting non existent file if file was in the
process of being uploaded
Writeback
- Don't transfer the file if it has disappeared in the meantime
- Take our own copy of the file name to avoid deadlocks
- Fix delayed retry logic
- Wait for upload to finish when cancelling upload
Fix race condition in item saving
Fix race condition in vfscache test
Make sure we delete the file on the error path - this makes cascading
failures much less likely
This allows reads to only read part of the file and it keeps on disk a
cache of what parts of each file have been loaded.
File data itself is kept in sparse files.
Previously we were using f which calls f.String() which calls f.Path()
which can cause a deadlock if uses carelessly.
This patch explicitly calls f.Path() or f._path() to bring attention
to the fact that there is a call to a method.
As part of this we take a copy of the directory path as calling
d.Path() violates the total locking order.
See the comment at the top of file.go for details
When a file has its modtime set while it is open we delay setting the
modtime until the file is closed.
The file is then uploaded in Flush. In Release we check the cached
file has been uploaded by comparing modtimes and or hashes and upload
it again if it has changed.
Before this change we forgot to change the time on the cached file
when we updated the time file on the object, so this mean that Release
reset the time to the wrong time and uploaded the file again on
remotes which don't support hashes (eg crypt).
The fix was to set the modtime of the cached file at the same time we
set the modtime of the remote object. This means that the files check
as identical in Release so it doesn't try to upload the file.
This means that we avoid a double upload and the modtime is correct.
See: https://forum.rclone.org/t/modification-time-with-vfs-cache/13906/8
Before this change, when uploading files from the VFS cache which were
pending a rename, rclone would use the new path of the object when
specifiying the destination remote. This didn't cause a problem with
most backends as the subsequent rename did nothing, however with the
drive backend, since it updates objects, the incorrect Remote was
embedded in the object. This caused the rename to apparently succeed
but the object be at the wrong location.
The fix for this was to make sure we upload to the path stored in the
object if available.
This problem was spotted by the new rename tests for the VFS layer.
Before this change, renaming an open file when using the VFS cache was
delayed until the file was closed. This meant that the file was not
readable after a rename even though it is was in the cache.
After this change we rename the local cache file and the in memory
cache, delaying only the rename of the file in object storage.
See: https://forum.rclone.org/t/xen-orchestra-ebadf-bad-file-descriptor-write/13104
Before this change, with --vfs-cache-mode minimal,writes if files were
opened they would always be read from the remote, regardless of
whether they were in the cache or not.
This change checks to see if the file is in the cache when opening a
file with --vfs-cache-mode >= minimal and if so then it uses it from
the cache.
This makes --vfs-cache-mode writes in particular much more
efficient. No longer is a file uploaded (with write mode) then
immediately downloaded (with read only mode).
Fixes#3330
