--- title: Linux 7.3 Makes Preparations Toward Upstreaming FAMFS... description: Linux 7.3 has merged NVDIMM and DAX code changes that prepare the kernel for eventual upstreaming of FAMFS, a specialized file system Micron has developed for... canonical: https://daily.dev/posts/linux-7-3-makes-preparations-toward-upstreaming-famfs-file-system-wpkn1dnhn twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Linux 7.3 Makes Preparations Toward Upstreaming FAMFS File-System | daily.dev og:description: Linux 7.3 has merged NVDIMM and DAX code changes that prepare the kernel for eventual upstreaming of FAMFS, a specialized file system Micron has developed for... og:url: https://daily.dev/posts/linux-7-3-makes-preparations-toward-upstreaming-famfs-file-system-wpkn1dnhn og:image: https://api.daily.dev/og/posts/wPkN1dNHn.png og:image:alt: Linux 7.3 Makes Preparations Toward Upstreaming FAMFS File-System og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Linux 7.3 Makes Preparations Toward Upstreaming FAMFS File-System **[Phoronix](https://daily.dev/sources/phoronix)** · 2 min read · 0 upvotes · 0 comments ## Summary Linux 7.3 has merged NVDIMM and DAX code changes that prepare the kernel for eventual upstreaming of FAMFS, a specialized file system Micron has developed for fabric-attached memory (FAM) devices used in CXL servers. FAMFS is not a general-purpose file system but targets byte-level access to massive disaggregated memory pools (100TB+). The file system itself has not yet been submitted for the 7.3 merge window but has gone through thirteen rounds of patch review, with v13 patches available for those wanting to try it in its current form. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What is FAMFS and why is Micron building it as a new Linux file system? FAMFS is a special-purpose file system developed by Micron for fabric-attached memory (FAM) devices, designed for file-based, byte-level access to very large shared or disaggregated memory pools, often around 100TB or more. It is not meant for general-purpose use. Micron tested a FUSE user-space implementation but concluded a standalone kernel driver works best, and has committed to maintaining it long-term. _Track how CXL memory storage evolves in the kernel by following FAMFS coverage on daily.dev._ ### Has FAMFS been merged into the Linux kernel yet? Not yet as a full file system. Linux 7.3 merged supporting NVDIMM and DAX code changes, including fixes and refactoring, to prepare for FAMFS, but the file system itself has not been submitted for upstream inclusion and there is no indication it will land in the 7.3 merge window. It has gone through thirteen rounds of patch review, with v13 patches publicly available. _Kernel engineers watching CXL storage progress can follow FAMFS upstreaming status on daily.dev._ ## Similar posts on daily.dev - [FamFS Hopes To Go Upstream In 2026](https://daily.dev/posts/famfs-hopes-to-go-upstream-in-2026-kedajgcb1) · Phoronix · 0 upvotes · 0 comments - [Linux Enacts Guidance To Tighten Acceptance Of New File-Systems Into The Kernel](https://daily.dev/posts/linux-enacts-guidance-to-tighten-acceptance-of-new-file-systems-into-the-kernel-qifusx1an) · Phoronix · 2 upvotes · 0 comments - [F2FS With Now Handle Multi-Device Flushes In Parallel With Linux 7.3](https://daily.dev/posts/f2fs-with-now-handle-multi-device-flushes-in-parallel-with-linux-7-3-culv6pkkp) · Phoronix · 1 upvotes · 0 comments - [DAXFS Proposed As Newest Linux File-System](https://daily.dev/posts/daxfs-proposed-as-newest-linux-file-system-v6rolabdt) · Phoronix · 0 upvotes · 0 comments --- Tags: [#linux](https://daily.dev/tags/linux), [#filesystems](https://daily.dev/tags/filesystems) [View this post on daily.dev](https://daily.dev/posts/linux-7-3-makes-preparations-toward-upstreaming-famfs-file-system-wpkn1dnhn) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Linux 7.3 Makes Preparations Toward Upstreaming FAMFS File-System","url":"https://daily.dev/posts/linux-7-3-makes-preparations-toward-upstreaming-famfs-file-system-wpkn1dnhn","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/linux-7-3-makes-preparations-toward-upstreaming-famfs-file-system-wpkn1dnhn"},"datePublished":"2026-08-23T11:30:33.939Z","dateModified":"2026-08-23T18:20:32.929Z","description":"Linux 7.3 has merged NVDIMM and DAX code changes that prepare the kernel for eventual upstreaming of FAMFS, a specialized file system Micron has developed for...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/9babf93ef77aa1d10c51dcf2e4ff89f8?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/9babf93ef77aa1d10c51dcf2e4ff89f8?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Phoronix","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Phoronix","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/6a26ba379dd64932830aa0c9803dd7ee","url":"https://daily.dev/sources/phoronix"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/linux-7-3-makes-preparations-toward-upstreaming-famfs-file-system-wpkn1dnhn","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"linux,filesystems","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Phoronix","item":"https://daily.dev/sources/phoronix"},{"@type":"ListItem","position":3,"name":"Linux 7.3 Makes Preparations Toward Upstreaming FAMFS File-System"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/linux-7-3-makes-preparations-toward-upstreaming-famfs-file-system-wpkn1dnhn#faq","mainEntity":[{"@type":"Question","name":"What is FAMFS and why is Micron building it as a new Linux file system?","acceptedAnswer":{"@type":"Answer","text":"FAMFS is a special-purpose file system developed by Micron for fabric-attached memory (FAM) devices, designed for file-based, byte-level access to very large shared or disaggregated memory pools, often around 100TB or more. 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