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| author | Amir Goldstein <amir73il@gmail.com> | 2023-10-11 17:07:03 +0300 |
|---|---|---|
| committer | Amir Goldstein <amir73il@gmail.com> | 2023-10-14 09:24:11 +0300 |
| commit | 32db510708507f6133f496ff385cbd841d8f9098 (patch) | |
| tree | 11f002bc14bc735248a64ef174756f3ddf4f3c07 /Documentation/filesystems | |
| parent | c34706acf40b43dd31f67c92c5a95d39666a1eb3 (diff) | |
| download | linux-32db510708507f6133f496ff385cbd841d8f9098.tar.xz | |
ovl: fix regression in showing lowerdir mount option
Before commit b36a5780cb44 ("ovl: modify layer parameter parsing"),
spaces and commas in lowerdir mount option value used to be escaped using
seq_show_option().
In current upstream, when lowerdir value has a space, it is not escaped
in /proc/mounts, e.g.:
none /mnt overlay rw,relatime,lowerdir=l l,upperdir=u,workdir=w 0 0
which results in broken output of the mount utility:
none on /mnt type overlay (rw,relatime,lowerdir=l)
Store the original lowerdir mount options before unescaping and show
them using the same escaping used for seq_show_option() in addition to
escaping the colon separator character.
Fixes: b36a5780cb44 ("ovl: modify layer parameter parsing")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/overlayfs.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/filesystems/overlayfs.rst b/Documentation/filesystems/overlayfs.rst index cdefbe73d85c..5b93268e400f 100644 --- a/Documentation/filesystems/overlayfs.rst +++ b/Documentation/filesystems/overlayfs.rst @@ -339,6 +339,18 @@ The specified lower directories will be stacked beginning from the rightmost one and going left. In the above example lower1 will be the top, lower2 the middle and lower3 the bottom layer. +Note: directory names containing colons can be provided as lower layer by +escaping the colons with a single backslash. For example: + + mount -t overlay overlay -olowerdir=/a\:lower\:\:dir /merged + +Since kernel version v6.5, directory names containing colons can also +be provided as lower layer using the fsconfig syscall from new mount api: + + fsconfig(fs_fd, FSCONFIG_SET_STRING, "lowerdir", "/a:lower::dir", 0); + +In the latter case, colons in lower layer directory names will be escaped +as an octal characters (\072) when displayed in /proc/self/mountinfo. Metadata only copy up --------------------- |