[LU-15833] Don't use realpath in llapi_search_fsname.

• Status: Resolved
• Project: Lustre
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.3
• Type: Improvement
• Priority: Minor
• Reporter: Etienne Aujames
• Assignee: Etienne Aujames
• Resolution: Fixed

Description

llapi_search_fsname() uses to determine the mountpoint of a path and then return its fsname.

realpath() executes lstat() for each component of the path: this means that the client must have a LDLM read lock on every directory in the path.
These operations can be slow when some clients modify parent directories.

We can use st_dev or llapi_get_name to reduce the number of stats.

Comments

[Gerrit Updater]

"Etienne AUJAMES <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/47258
Subject: LU-15833 llapi: don't use realpath in llapi_search_fsname()
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 2c759b6e921e433f3eff9c04270fb58f8eebd0fd

[Peter Jones]

Landed for 2.16

[Gerrit Updater]

"Etienne AUJAMES <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/c/fs/lustre-release/+/49482
Subject: LU-15833 llapi: don't use realpath in llapi_search_fsname()
Project: fs/lustre-release
Branch: b2_12
Current Patch Set: 1
Commit: 495386a7a373e0abad402ddcc012daeda8003e83

[Gerrit Updater]

"Jian Yu <[e-mail]>" uploaded a new patch: https://review.whamcloud.com/c/fs/lustre-release/+/49649
Subject: LU-15833 llapi: don't use realpath in llapi_search_fsname()
Project: fs/lustre-release
Branch: b2_15
Current Patch Set: 1
Commit: 0d2f682c14ae17fe096f28ffb2191ead06100041

[Gerrit Updater]

"Oleg Drokin <[e-mail]>" merged in patch https://review.whamcloud.com/c/fs/lustre-release/+/49649/
Subject: LU-15833 llapi: don't use realpath in llapi_search_fsname()
Project: fs/lustre-release
Branch: b2_15
Current Patch Set:
Commit: 4b3f50d88d18a8c4a37c0de863a098141e2b84ab