generic_setlease(9)

💅 generic_setlease(9)

okay so bestie, welcome to the Kernel API Manual page for generic_setlease — yes we're in the kernel API manual today, we're being ✨academic✨ and also a little unhinged about file leases. it's giving "locks but make it dramatic." let's get into it 🫶

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🌸 NAME 🌸

generic_setlease — sets a lease on an open file. literally that's the whole vibe. a lease. on an open file. slay 🔥

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✨ SYNOPSIS ✨

int generic_setlease (struct file *filp , int arg , struct file_lease
**flp , void **priv );

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🎀 ARGUMENTS 🎀

• filp — file pointer. yep, the file. the actual file pointer. no cap 🦋
• arg — type of lease to obtain. which flavor of lease are we getting bestie 👀
• flp — input — file_lock to use, output — file_lock inserted. so it's serving double duty: comes in as the lock you wanna use, leaves as the lock that actually got inserted. main character energy tbh 💅
• priv — private data for lm_setup (may be NULL if lm_setup doesn't require it). so if lm_setup is lowkey chill and doesn't need it, you can just pass NULL 🙈

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🦋 DESCRIPTION 🦋

the (input) flp->fl_lmops->lm_break function is required by break_lease. like, not optional, not a nice-to-have, it's required, periodt. 🔥

heads up bestie: flp->fl_lmops->lm_break — that's the input flp's field, and break_lease needs it. don't come for me, that's just what it says 💀

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🌈 SEE ALSO 🌈

kernel file ./fs/locks.c and also the whole friend group:

• locks_owner_has_blockers(9)
• lease_open_conflict(9)
• locks_delete_block(9)
• posix_lock_file(9)
• posix_lock_inode_wait(9)
• inode_lease_ignore_mask(9)
• __break_lease(9)
• lease_get_mtime(9)
• __fcntl_getlease(9)
• vfs_setlease(9)
• fcntl_setlease(9)
• fcntl_setdeleg(9)
• flock_lock_inode_wait(9)
• locks_lock_inode_wait(9)
• sys_flock(9)
• vfs_test_lock(9)
• locks_translate_pid(9)
• vfs_lock_file(9)
• vfs_cancel_lock(9)
• vfs_inode_has_locks(9)

like, the entire lease-and-locking friend group is here. iykyk 🧚💜

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okay that's the whole page bestie!! this one came from the source ./fs, dated October 2026, and it's filed under generic_setlease(9) in the Kernel API Manual. go set some leases responsibly, mwah 💖✨🍓