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X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: DumCkv7X9zLva3KQDBjAWMRKM2k6anE4Stb5QWx06102f7DD0hFS91oiJej6J4wpdOWPbasUyr+AkEFvXS7IIg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR10MB6870 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-13_06,2025-02-13_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 malwarescore=0 mlxlogscore=999 mlxscore=0 spamscore=0 suspectscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2501170000 definitions=main-2502130108 X-Proofpoint-GUID: HLe-o93-cS5cF7PqjrTO13hA_pc4H_2k X-Proofpoint-ORIG-GUID: HLe-o93-cS5cF7PqjrTO13hA_pc4H_2k On 2/12/25 9:16 PM, Mikhail Gavrilov wrote: > Hi, > I spotted that Google Chrome started working without HW acceleration. > And git bisect found commit b9b588f22a0c049a14885399e27625635ae6ef91 > Author: Chuck Lever > Date: Sat Dec 28 12:55:21 2024 -0500 > > libfs: Use d_children list to iterate simple_offset directories > > The mtree mechanism has been effective at creating directory offsets > that are stable over multiple opendir instances. However, it has not > been able to handle the subtleties of renames that are concurrent > with readdir. > > Instead of using the mtree to emit entries in the order of their > offset values, use it only to map incoming ctx->pos to a starting > entry. Then use the directory's d_children list, which is already > maintained properly by the dcache, to find the next child to emit. > > One of the sneaky things about this is that when the mtree-allocated > offset value wraps (which is very rare), looking up ctx->pos++ is > not going to find the next entry; it will return NULL. Instead, by > following the d_children list, the offset values can appear in any > order but all of the entries in the directory will be visited > eventually. > > Note also that the readdir() is guaranteed to reach the tail of this > list. Entries are added only at the head of d_children, and readdir > walks from its current position in that list towards its tail. > > Signed-off-by: Chuck Lever > Link: https://lore.kernel.org/r/20241228175522.1854234-6-cel@kernel.org > Signed-off-by: Christian Brauner > > fs/libfs.c | 84 > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-------------------------- > 1 file changed, 58 insertions(+), 26 deletions(-) > > I tested Google Chrome after reverting commit b9b588f22a0c and ensured > that this fixed the issue. I need a simpler reproducer, please. "Chrome stopped working" doesn't give me anything actionable. > Machine spec: https://linux-hardware.org/?probe=5810cda90d > I attached below my build config. > > Chuck, you, as the author problem commit, can look into this, please? -- Chuck Lever