[PATCH v2] man/man2/mount.2: add ENOSPC

[PATCH v2] man/man2/mount.2: add ENOSPC

[Chen Linxuan via B4 Relay]

From: Chen Linxuan <me@black-desk.cn>

After linux commit d29216842a85 ("mnt: Add a per mount namespace limit
on the number of mounts"), mount(2) might return ENOSPC.

Signed-off-by: Chen Linxuan <me@black-desk.cn>
---
Changes in v2:
- Apply changes suggested by Alejandro:
  - Correct the sign-off line;
  - Use semantic newlines.
- Link to v1: https://lore.kernel.org/r/20260130-add-enospc-for-mount-v1-1-85b45f0ce3d8@black-desk.cn
---
 man/man2/mount.2 | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/man/man2/mount.2 b/man/man2/mount.2
index d5a68cb836b2..35fef946a6d6 100644
--- a/man/man2/mount.2
+++ b/man/man2/mount.2
@@ -793,6 +793,21 @@ A pathname was empty or had a nonexistent component.
 .B ENOMEM
 The kernel could not allocate a free page to copy filenames or data into.
 .TP
+.B ENOSPC
+Number of mounts will exceed the limit after this syscall
+in some mount namespaces.
+This limit is controlled by
+.IR /proc/sys/fs/mount-max ,
+see
+.BR proc_sys_fs (5)
+for details of this limit.
+Note that this limit applies
+both to the mount namespace where the mount operation occurs
+and to any mount namespaces to which the mount will propagate.
+See
+.BR mount_namespaces (7)
+for details for mount namespace and mount propagation.
+.TP
 .B ENOTBLK
 .I source
 is not a block device (and a device was required).

---
base-commit: 6754bd1a126ed1e9b7d9c2bc1d221681f5182bb3
change-id: 20260130-add-enospc-for-mount-3ea1e87af6ee

Best regards,
-- 
Chen Linxuan <me@black-desk.cn>

Re: [PATCH v2] man/man2/mount.2: add ENOSPC

[Alejandro Colomar]

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Hi Chen,

On 2026-02-01T11:59:33+0800, Chen Linxuan via B4 Relay wrote:
> From: Chen Linxuan <me@black-desk.cn>
> 
> After linux commit d29216842a85 ("mnt: Add a per mount namespace limit
> on the number of mounts"), mount(2) might return ENOSPC.
> 
> Signed-off-by: Chen Linxuan <me@black-desk.cn>

Thanks!  I've applied the patch.


Have a lovely night!
Alex

> ---
> Changes in v2:
> - Apply changes suggested by Alejandro:
>   - Correct the sign-off line;
>   - Use semantic newlines.
> - Link to v1: https://lore.kernel.org/r/20260130-add-enospc-for-mount-v1-1-85b45f0ce3d8@black-desk.cn
> ---
>  man/man2/mount.2 | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/man/man2/mount.2 b/man/man2/mount.2
> index d5a68cb836b2..35fef946a6d6 100644
> --- a/man/man2/mount.2
> +++ b/man/man2/mount.2
> @@ -793,6 +793,21 @@ A pathname was empty or had a nonexistent component.
>  .B ENOMEM
>  The kernel could not allocate a free page to copy filenames or data into.
>  .TP
> +.B ENOSPC
> +Number of mounts will exceed the limit after this syscall
> +in some mount namespaces.
> +This limit is controlled by
> +.IR /proc/sys/fs/mount-max ,
> +see
> +.BR proc_sys_fs (5)
> +for details of this limit.
> +Note that this limit applies
> +both to the mount namespace where the mount operation occurs
> +and to any mount namespaces to which the mount will propagate.
> +See
> +.BR mount_namespaces (7)
> +for details for mount namespace and mount propagation.
> +.TP
>  .B ENOTBLK
>  .I source
>  is not a block device (and a device was required).
> 
> ---
> base-commit: 6754bd1a126ed1e9b7d9c2bc1d221681f5182bb3
> change-id: 20260130-add-enospc-for-mount-3ea1e87af6ee
> 
> Best regards,
> -- 
> Chen Linxuan <me@black-desk.cn>
> 
> 

-- 
<https://www.alejandro-colomar.es>

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