APPLIED: [SRU][J:azure][PATCH 0/1] azure: backport "netfs: Fix missing xas_retry() calls in xarray iteration"

[John Cabaj]

On 2/14/25 4:38 PM, Vinicius Peixoto wrote:
> BugLink: https://bugs.launchpad.net/bugs/2098534
> 
> [Impact]
> 
> Microsoft has asked us to backport commit 7e043a80b5da ("netfs: Fix missing xas_retry() calls in xarray iteration") to the 5.15 Azure kernel.
> 
> [Fix]
> 
> Backported to the J:azure tree.
> 
> [Test plan]
> 
> Build tested only; Microsoft will test the bug fix.
> 
> [Where problems could occur]
> 
> Due to the significant delta between the Jammy 5.15 tree and commit 7e043a80b5da, particularly w.r.t. fs/netfs/read_helper.c, that got split into multiple files in 5.17, as well as the change that introduced the usage of folios in netfslib, a manual backported was required. The changes, however, were relatively simple/self-contained, and as such this presents a medium regression risk. Any issues with this patch could manifest as either a null pointer dereference in netfs_rreq_unlock/netfs_rreq_unmark_after_write, or potentially as a hung thread when doing a lot of I/O on an netfs filesystem.
> 
> David Howells (1):
>    netfs: Fix missing xas_retry() calls in xarray iteration
> 
>   fs/netfs/read_helper.c | 12 ++++++++++--
>   1 file changed, 10 insertions(+), 2 deletions(-)
> 

Applied to jammy linux-azure master-next branch.


Thanks,
John