[LU-17482] short read does not set ki_pos correctly Created: 30/Jan/24  Updated: 02/Feb/24

Status: Open
Project: Lustre
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Bug Priority: Major
Reporter: Zhenyu Xu Assignee: Zhenyu Xu
Resolution: Unresolved Votes: 0
Labels: None

Issue Links:
Related
Severity: 3
Rank (Obsolete): 9223372036854775807

 Description    
00000080:00020000:3.0:1706058118.952841:0:7094:0:(file.c:2098:file_read_confine_iter()) event.log.20240123T162623_0: read [198356992, 198361088] over eof, kms 198356992, file_size 198356992.
00000080:00020000:3.0:1706058118.952904:0:7094:0:(file.c:2098:file_read_confine_iter()) event.log.20240123T162623_0: read [198361088, 198365184] over eof, kms 198362740, file_size 198362740.

short read does not set ki_pos correctly, and jumps to wrong position at next read as the file being appended by others.

 Comments   
Comment by Zhenyu Xu [ 30/Jan/24 ]

https://review.whamcloud.com/c/fs/lustre-release/+/53827/

LU-17482 llite: short read could mess up next read offset

When read reaches EOF, it could read data from stale pagecache, but
we need to restore the iocb->ki_pos so that next read could continue
from the correct offset.

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